Wheeled load-bearing device

Abstract

A wheeled load-bearing device (10) includes: a support structure (11) including a standing frame; a wheel seat (30) equipped with a wheel and pivotally connected to the standing frame, the wheel being pivotable about a first wheel axis relative to the first wheel seat; a locking assembly (39) including a wheel seat latch movably connected to the standing frame, the wheel seat latch engaging with the wheel seat to pivotally lock the first wheel seat to the standing frame, and disengaging from the wheel seat to release the wheel seat, thereby enabling the wheel seat to pivot and change the direction of the wheel axis; an actuation assembly (48) coupled to the wheel seat latch and including one or more connecting members; and an unlocking mechanism (52) including an operating part disposed on the support structure and operable to cause the actuation assembly to pull the wheel seat latch, thereby disengaging the wheel seat latch from the wheel seat.

Description

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 201910514627.1 filed on June 13, 2019; Chinese Patent Application No. 201910787608.6 filed on August 23, 2019; Chinese Patent Application No. 201910858955.3 filed on September 11, 2019; Chinese Patent Application No. 201911336477.6 filed on December 23, 2019; and Chinese Patent Application No. 202010370191.6 filed on April 30, 2020. Technical Field

[0003] This invention relates to wheeled load-bearing devices. Background Technology

[0004] Caregivers typically rely on strollers to transport infants and children. Most strollers have front wheels that can pivot freely horizontally relative to the frame to change the direction of the wheel axle, while the rear wheels cannot pivot horizontally and have a fixed lateral wheel axle. Therefore, strollers are not easily maneuverable in confined spaces.

[0005] Therefore, an improved design that can provide better maneuverability and solve at least the above problems is still needed. Summary of the Invention

[0006] This application discloses a wheeled load-bearing device in which the wheel assembly is controllably locked and unlocked in the horizontal direction and provides better mobility.

[0007] This disclosure provides a wheeled load-bearing device, comprising: a support structure including a standing frame; a first wheel seat with a first wheel mounted on it and pivotally connected to the standing frame, the first wheel being pivotable about a first wheel axis relative to the first wheel seat; a locking assembly including a first wheel seat latch movably connected to the standing frame, the first wheel seat latch being engageable with the first wheel seat to pivotally lock the first wheel seat to the standing frame, and disengaging from the first wheel seat to release the first wheel seat, thereby allowing the first wheel seat to pivot relative to the standing frame and change the direction of the first wheel axis; an actuation assembly coupled to the first wheel seat latch; and an unlocking mechanism including an operating part disposed on the support structure away from the first wheel seat latch, the unlocking mechanism being operable to cause the actuation assembly to actuate the first wheel seat latch, thereby disengaging the first wheel seat latch from the first wheel seat.

[0008] According to one embodiment, the unlocking mechanism can be operated to cause the actuation component to push or pull the first wheel seat latch, thereby disengaging the first wheel seat latch from the first wheel seat.

[0009] According to one embodiment, the locking assembly includes a locking spring connected to the first wheel seat latch, the locking spring being capable of applying a biasing force to engage the first wheel seat latch with the first wheel seat.

[0010] According to one embodiment, the support structure further includes a pusher frame coupled to the standing frame, and the operating part may be optionally disposed on the pusher frame.

[0011] According to one embodiment, the operating part is slidably or pivotally connected to the support structure, especially the pusher frame.

[0012] According to one embodiment, the actuation assembly includes a connecting actuator and a connecting member, the connecting actuator being movably connected to the support structure, and the connecting member coupling the first wheel seat latch to the connecting actuator.

[0013] According to one embodiment, the connecting actuator is movable to actuate the connecting member, particularly by pushing or pulling the connecting member, and causing the first wheel seat latch to disengage from the first wheel seat.

[0014] According to one embodiment, the connector includes a cable.

[0015] According to one embodiment, the operating part is coupled to the connecting actuator via a cable.

[0016] According to one embodiment, the actuation assembly includes a connecting actuator, and the support structure further includes a pusher frame coupled to the standing frame via a linkage mechanism, wherein the connecting actuator is movably connected to the linkage mechanism.

[0017] According to one embodiment, the linkage mechanism includes a rod body, the two ends of which are pivotally connected to the pusher frame and the standing frame, respectively, and the connecting actuator is slidably connected to the rod body.

[0018] According to one embodiment, the operating part is disposed on the pusher frame.

[0019] According to one embodiment, the actuation assembly includes a connecting actuator slidably connected to the support structure, and the operating portion has an inclined surface. The unlocking mechanism is operable to release the first wheel seat latch by sliding contact between the inclined surface and the connecting actuator.

[0020] According to one embodiment, the operating part includes a rotating drum pivotally connected to the support structure, and the actuation assembly includes a connecting member having a cable having one end anchored to the rotating drum. The rotating drum is pivotable to at least partially wind up the cable, thereby actuating the first wheel seat latch by the actuation assembly, particularly by pushing or pulling it, and disengaging it from the first wheel seat.

[0021] According to one embodiment, the operating part includes a rotating drum pivotally connected to the support structure and a button slidably connected to the support structure, and the actuation assembly includes a connecting member, the connecting member including a cable having one end anchored to the rotating drum, the button being operable to cause the rotating drum to pivot and operate the cable, thereby actuating the first wheel seat latch by the actuation assembly, particularly by pulling the cable to pull the first wheel seat latch by the actuation assembly and disengage it from the first wheel seat.

[0022] According to one embodiment, the standing frame includes a footrest, and the operating part is disposed on the footrest.

[0023] According to one embodiment, the tripod includes a side section and a cross section fixedly connected to each other, and the operating part is disposed on the side section or the cross section.

[0024] According to one embodiment, the actuation assembly includes a single cable with its opposite ends connected to the operating part and the first wheel seat latch, respectively.

[0025] According to one embodiment, the wheeled support device further includes: a second wheel seat, on which a second wheel is mounted and pivotally connected to the standing frame, the second wheel being pivotable about a second wheel axis relative to the second wheel seat, the first wheel seat and the second wheel seat being spaced apart along a longitudinal axis extending from the rear to the front of the wheeled support device; and a second locking assembly, including a second wheel seat latch movably connected to the standing frame, the second wheel seat latch being engageable with the second wheel seat to pivotally lock the second wheel seat to the standing frame, and being disengaged from the second wheel seat to release the second wheel seat, thereby allowing the second wheel seat to pivot relative to the standing frame to change the direction of the second wheel axis.

[0026] According to one embodiment, the support structure further includes a pusher frame coupled to the standing frame and pivotable relative to the standing frame between a first position and a second position, wherein the unlocking mechanism is configured to be operable in either the first position or the second position to simultaneously unlock the first wheel seat and the second wheel seat.

[0027] According to one embodiment, the actuation assembly includes: a connecting actuator movably connected to the support structure, particularly the standing frame or the pusher frame; and a first connecting member and a second connecting member, the first connecting member coupling the first wheel seat latch to the connecting actuator, and the second connecting member coupling the second wheel seat latch to the connecting actuator; wherein the connecting actuator is movable in a first direction to actuate the second connecting member, particularly by pushing or pulling the second connecting member, thereby causing the second wheel seat latch to disengage from the second wheel seat while simultaneously releasing the first connecting member, thereby allowing the first wheel seat latch to engage with the first wheel seat, and the connecting actuator is movable in a second direction opposite to the first direction to actuate the first connecting member, particularly by pushing or pulling the second connecting member, thereby causing the first wheel seat latch to disengage from the first wheel seat while simultaneously releasing the second connecting member, thereby allowing the second wheel seat latch to engage with the second wheel seat.

[0028] According to one embodiment, the connecting actuator can move in a first direction or a second direction in response to a pivoting of the pusher between a first position and a second position.

[0029] According to one embodiment, either the first connector or the second connector includes a cable.

[0030] According to one embodiment, the pusher frame is pivotable relative to the standing frame about a pivot axis between a first position and a second position, and the connecting actuator is pivotally connected to the standing frame by the same pivot axis.

[0031] According to one embodiment, the unlocking mechanism further includes a coupling member connected to the operating part. The coupling member is movable relative to the connecting actuator between a first state and a second state. When the coupling member is in the second state and the pusher is in the first position, the connecting actuator is pivotal relative to the pusher or the standing frame in a first direction, causing the second wheel seat latch to disengage from the second wheel seat.

[0032] According to one embodiment, the connecting actuator can pivot relative to the pusher or the standing frame in a second direction when the coupling member is in the second state and the pusher is in the second position, and in the second direction causes the first wheel seat latch to disengage from the first wheel seat.

[0033] According to one embodiment, the coupling member is supported by the pusher frame and is movable relative to the pusher frame, wherein the connecting actuator is coupled to the pusher frame such that the connecting actuator and the pusher frame can pivot synchronously when the coupling member is in a first state.

[0034] According to one embodiment, the actuation assembly further includes: a first spring connected to the connecting actuator, the first spring biasing the connecting actuator to pivot in a first direction relative to the stand and the pusher; and / or a second spring connected to the connecting actuator, the second spring biasing the connecting actuator to pivot in a second direction relative to the stand and the pusher.

[0035] According to one embodiment, the unlocking mechanism further includes a coupling member supported by the pusher frame and connected to the operating part. The coupling member is movable relative to the pusher frame and the connecting actuator between a first state and a second state. The connecting actuator is coupled to the pusher frame and can pivot synchronously when the coupling member is in the first state, while the connecting actuator can pivot relative to the pusher frame and the standing frame when the coupling member is in the second state.

[0036] According to one embodiment, the coupling member engages with the connecting actuator in a first state to prevent the connecting actuator from pivoting relative to the pusher frame; when the coupling member is in a second state, the connecting actuator can pivot relative to the pusher frame and the standing frame by the biasing force of the first spring or the second spring.

[0037] According to one embodiment, the pusher can pivot between a first position and a second position when the coupling member is in a first state. Therefore, when the pusher pivots from the second position to the first position, the connecting actuator can pivot synchronously with the pusher in a first direction, and when the pusher pivots from the first position to the second position, the connecting actuator can pivot synchronously with the pusher in a second direction.

[0038] According to one embodiment, the operating unit can be operated when the pusher frame is in a first position to move the coupling member relative to the pusher frame from a first state to a second state, such that the connecting actuator biased by the second spring pivots in a second direction and actuates the first connecting member, in particular pushing or pulling the first connecting member, thereby disengaging the first wheel seat latch from the first wheel seat; and the operating unit can be operated when the pusher frame is in a second position to move the coupling member relative to the pusher frame from a first state to a second state, such that the connecting actuator biased by the first spring pivots in a first direction and actuates the second connecting member, in particular pushing or pulling the second connecting member, thereby disengaging the second wheel seat latch from the second wheel seat.

[0039] According to one embodiment, the connecting actuator has a generally V-shaped slot and a notch at the bottom of the slot, the coupling member being adapted to engage with the notch in a first state and to disengage from the notch in a second state.

[0040] According to one embodiment, the operating part is connected to the coupling member via a cable.

[0041] According to one embodiment, the actuation assembly further includes a cable assembly that couples the operating part to the first wheel seat latch and the second wheel seat latch but not to the connecting actuator. The operating part can be operated to actuate the cable assembly, in particular by pushing or pulling the cable assembly, so that the first wheel seat latch and the second wheel seat latch disengage from the first wheel seat and the second wheel seat, respectively.

[0042] According to one embodiment, the cable assembly includes a slider, a first cable portion, a second cable portion, and a third cable. The first cable portion and the second cable portion are connected to the slider, and the third cable is connected to the slider and the operating part. The first cable portion is also connected to the first connecting member or the first wheel seat latch, and the second cable portion is also connected to the second connecting member or the second wheel seat latch.

[0043] According to one embodiment, the actuation assembly further includes a pivot coupling mechanism, wherein during the pivoting of the pusher frame between the first position and the second position, the pivot coupling mechanism is configured to pivotally couple the connecting actuator to the pusher frame; and when the pusher frame pivots to fold the wheeled load-bearing device, the pivot coupling mechanism is configured to pivotally decouple the connecting actuator from the pusher frame.

[0044] According to one embodiment, the standing frame includes a first coupling member, the pusher frame includes a second coupling member pivotally connected to the first coupling member, and the pivot coupling mechanism includes a guide groove provided on the first coupling member and a capture member supported by the connecting actuator. The capture member has a protrusion received in the guide groove. The guide groove has a first slot and a second slot inclined at an angle relative to the first slot. The capture member is movable relative to the connecting actuator between a first state and a second state. In the first state, the capture member engages with the second coupling member and the protrusion is received in the first slot to pivotally couple the connecting actuator to the pusher frame. In the second state, the capture member disengages from the second coupling member and the protrusion is received in the second slot to pivotally decouple the connecting actuator from the pusher frame.

[0045] According to one embodiment, when the pusher arm pivots between a first position and a second position, the protrusion of the catcher is adapted to slide along the first slot.

[0046] According to one embodiment, the pivot coupling mechanism further includes a spring connected to the catcher and the connecting actuator, respectively, the spring biasing the catcher toward a first state.

[0047] According to one embodiment, the actuation assembly further includes a spring connected to the connecting actuator. When the pusher arm pivots from the second position to the first position, the pusher arm contacts and causes the connecting actuator to move in the first direction. When the pusher arm pivots from the first position to the second position, the pusher arm moves away from the connecting actuator, allowing the connecting actuator to move in the second direction by the biasing force of the spring.

[0048] According to one embodiment, the first connector and the second connector are composed of a single cable.

[0049] According to one embodiment, the actuation assembly includes: a connecting actuator disposed adjacent to the pusher frame; and a connecting member having a middle portion, a first end portion, and a second end portion, the middle portion surrounding a first wheel seat latch, the first end portion and the second end portion being anchored to the connecting actuator and the second wheel seat latch, respectively; wherein the connecting actuator is pivotable synchronously with the pusher frame in a first direction to actuate the second end portion of the connecting member, particularly pushing or pulling the second end portion of the connecting member, and causing the second wheel seat latch to... The locking member disengages from the second wheel seat, and simultaneously relaxes the middle portion of the connecting member to engage the first wheel seat latch with the first wheel seat; and the connecting actuator can pivot synchronously with the pusher frame in a second direction opposite to the first direction to actuate the middle portion of the connecting member, especially by pushing or pulling the middle portion of the connecting member, and causing the first wheel seat latch to disengage from the first wheel seat, and simultaneously relaxes the second end of the connecting member to engage the second wheel seat latch with the second wheel seat.

[0050] According to one embodiment, the locking assembly includes a first locking spring connected to the first wheel seat latch, and the second locking assembly includes a second locking spring connected to the second wheel seat latch, wherein the biasing force applied by the first locking spring to engage the first wheel seat latch with the first wheel seat is greater than the biasing force applied by the second locking spring to engage the second wheel seat latch with the second wheel seat.

[0051] According to one embodiment, the operating part is connected to the connecting actuator via a cable. When the pusher is in either the first position or the second position, the operating part can be operated to pivot the connecting actuator in the same direction of the first and second directions, thereby unlocking the first wheel seat and the second wheel seat.

[0052] According to one embodiment, the operating part is connected via a cable to the connecting actuator or a drive member coupled to the connecting actuator, so that the operating part can be operated to pivot the connecting actuator.

[0053] According to one embodiment, the actuation assembly includes: a connecting actuator disposed adjacent to the pusher frame; and a connecting member having a middle portion, a first end portion, and a second end portion, the middle portion surrounding the connecting actuator, the first end portion and the second end portion being anchored to a first wheel seat latch and a second wheel seat latch, respectively; wherein the connecting actuator is pivotable synchronously with the pusher frame in a first direction to actuate the second end portion of the connecting member, particularly by pushing or pulling the second end portion of the connecting member, and causing the second wheel seat latch to... The locking member disengages from the second wheel seat, and simultaneously relaxes the middle portion of the connecting member to engage the first wheel seat latch with the first wheel seat; and the connecting actuator can pivot synchronously with the pusher frame in a second direction opposite to the first direction to actuate the middle portion of the connecting member, especially by pushing or pulling the middle portion of the connecting member, and causing the first wheel seat latch to disengage from the first wheel seat, and simultaneously relaxes the second end of the connecting member to engage the second wheel seat latch with the second wheel seat.

[0054] According to one embodiment, the actuation assembly further includes a cable assembly that couples the operating part to the first wheel seat latch and the second wheel seat latch but not to the connecting actuator. The operating part can be operated to actuate the cable assembly, in particular by pushing or pulling the cable assembly, so that the first wheel seat latch and the second wheel seat latch disengage from the first wheel seat and the second wheel seat, respectively.

[0055] According to one embodiment, the cable assembly includes a slider, a first cable portion, a second cable portion, and a third cable. The first cable portion and the second cable portion are connected to the slider, and the third cable is connected to the slider and the operating part. The first cable portion is also connected to the first wheel seat latch or a first portion of the connecting member, and the second cable portion is also connected to the second wheel seat latch or a second portion of the connecting member. The first portion and the second portion of the connecting member are folded relative to each other.

[0056] According to one embodiment, the actuation assembly includes: a first connecting actuator and a second connecting actuator, movably connected to the standing frame; a first connecting member and a second connecting member, wherein the first connecting member couples the first wheel seat latch to the first connecting actuator, and the second connecting member couples the second wheel seat latch to the second connecting actuator; and a coupling member, fixedly connected to the pusher frame and having an actuating portion; wherein, when the pusher frame pivots from a second position to a first position, the actuating portion moves away from the first connecting actuator, causing the second connecting actuator to move, particularly pushing or pulling the second connecting actuator. The first connecting actuator causes the second wheel seat latch to disengage from the second wheel seat, particularly by pushing or pulling the second wheel seat latch. When the pusher arm pivots from the first position to the second position, the actuating part moves away from the second connecting actuator, causing the second connecting actuator to move, particularly by pushing or pulling the first connecting actuator. This causes the first connecting actuator to actuate the first wheel seat latch, particularly by pushing or pulling the first wheel seat latch, thus disengaging the first wheel seat latch from the first wheel seat.

[0057] According to one embodiment, the unlocking mechanism further includes a first actuator, a second actuator, and an unlocking actuator. The first actuator and the second actuator are supported by the pusher frame. The unlocking actuator is coupled to the operating part and connected to the first actuator and the second actuator. When the pusher frame is in a first position, the first actuator is adjacent to the first connecting actuator, and the second actuator is away from the second connecting actuator. When the pusher frame is in a second position, the second actuator is adjacent to the second connecting actuator, and the first actuator is away from the first connecting actuator. When the pusher frame is in the first position, the operating part can be operated. The first actuator causes the first connecting actuator to move, particularly by pushing or pulling the first connecting actuator to actuate the first wheel seat latch, particularly by pushing or pulling the first wheel seat latch to disengage the first wheel seat latch from the first wheel seat; when the pusher is in the second position, the operating part can be operated to cause the second actuator to move the second connecting actuator, particularly by pushing or pulling the second connecting actuator to actuate the second wheel seat latch, particularly by pushing or pulling the second wheel seat latch to disengage the second wheel seat latch from the second wheel seat.

[0058] According to one embodiment, the wheeled support device is a stroller. Attached Figure Description

[0059] Figure 1A perspective view showing an embodiment of a wheeled load-bearing device;

[0060] Figure 2 Show Figure 1 An enlarged view of the linkage mechanism and connecting actuator in a wheeled load-bearing device;

[0061] Figure 3 Show Figure 1 An enlarged view of a wheel assembly in a wheeled load-bearing device;

[0062] Figure 4 Show Figure 1 A partial sectional view of the operating section provided in the wheeled load-bearing device;

[0063] Figure 5 Show Figure 1 A schematic diagram of the actuation components and unlocking mechanism installed in the wheeled load-bearing device;

[0064] Figure 6 and Figure 7 Show Figure 1 Partial cross-sectional views of different structures of the unlocking mechanism that can be installed in the wheeled load-bearing device;

[0065] Figure 8 and Figure 9 Show Figure 1 A partial cross-sectional view of another different structure of the unlocking mechanism that can be installed in the wheeled load-bearing device;

[0066] Figure 10 Show Figure 1 A perspective view of the wheeled load-bearing device, which includes another actuation component and another unlocking mechanism;

[0067] Figure 11 Show Figure 10 An exploded view of the actuation components and unlocking mechanism installed in the wheeled load-bearing device;

[0068] Figure 12 Show Figure 10 A perspective view of the operating unit provided in the wheeled load-bearing device;

[0069] Figure 13 and Figure 14 Showing the operating unit and Figure 11 A three-dimensional diagram showing the interaction between the connected actuators in the actuation assembly;

[0070] Figure 15 Show Figure 10 A cross-sectional view of a wheel assembly in a wheeled load-bearing device in a locked state relative to the support frame;

[0071] Figure 16 Show Figure 15A cross-sectional view of the wheel assembly in the unlocked state relative to the stand;

[0072] Figure 17 Show Figure 1 A perspective view of the different structures of the actuation components and unlocking mechanisms installed in the wheeled load-bearing device;

[0073] Figure 18 Show Figure 17 A perspective view of the operating part of the unlocking mechanism installed in the wheeled load-bearing device;

[0074] Figure 19 Show Figure 17 A perspective view showing the connection between the operating part and the actuation component in a wheeled load-bearing device;

[0075] Figure 20 and Figure 21 Schematic diagrams showing different structures of the operating part in the unlocking mechanism of the wheeled load-bearing device;

[0076] Figure 22 A perspective view showing another embodiment of the wheeled load-bearing device;

[0077] Figure 23 Show Figure 22 A cross-sectional view of a wheel assembly provided in a wheeled load-bearing device;

[0078] Figure 24 Show Figure 22 A perspective view of another wheel assembly provided in the wheeled load-bearing device;

[0079] Figure 25 Show Figure 22 A schematic diagram of the actuation components provided in the wheeled load-bearing device;

[0080] Figure 26 Show Figure 22 A schematic diagram showing the structural details of the actuation components installed in the wheeled load-bearing device;

[0081] Figure 27 Show Figure 22 A perspective view of other structural details of the actuation components installed in the wheeled load-bearing device;

[0082] Figure 28 Show Figure 22 A schematic diagram of the operating part of the unlocking mechanism in a wheeled load-bearing device;

[0083] Figure 29 Show Figure 22 Schematic diagrams of different structures of wheeled load-bearing devices equipped with actuation components;

[0084] Figure 30 Show Figure 29 Enlarged view of some structural details of the actuation components installed in the wheeled load-bearing device;

[0085] Figure 31 Show Figure 30 A perspective view of the connecting actuator provided in the actuation assembly;

[0086] Figure 32 A perspective view showing another actuation component and unlocking mechanism in the wheeled load-bearing device;

[0087] Figure 33 Show Figure 32 A cross-sectional view of a wheel assembly provided in a wheeled load-bearing device;

[0088] Figure 34 Show Figure 32 A perspective view of another wheel assembly provided in the wheeled load-bearing device;

[0089] Figure 35 Show Figure 32 An enlarged view of the actuation components installed in the wheeled load-bearing device;

[0090] Figure 36 Show Figure 32 A perspective view of a portion of the actuation assembly located on the support rod in the wheeled load-bearing device;

[0091] Figure 37 Show Figure 32 A three-dimensional view of the actuation components installed on the wheeled load-bearing device;

[0092] Figure 38 Show Figure 37 Three-dimensional diagrams of different structures of the actuation components;

[0093] Figure 39 Show Figure 37 A three-dimensional view of another different structure of the actuation component;

[0094] Figure 40 A side view showing the wheeled load-bearing device with another actuation component and unlocking mechanism;

[0095] Figure 41 Show Figure 40 A schematic diagram showing some structural details of the actuation components installed in the wheeled load-bearing device;

[0096] Figure 42 Show Figure 40 A schematic diagram of a portion of the actuation component and a portion of the unlocking mechanism installed in the wheeled load-bearing device;

[0097] Figure 43 Show Figure 40A perspective view of a portion of the actuation components and a portion of the unlocking mechanism installed in the wheeled load-bearing device;

[0098] Figure 44 Show Figure 40 An enlarged view of a wheel assembly in a wheeled load-bearing device;

[0099] Figure 45 Show Figure 40 An enlarged view of another wheel assembly provided in the wheeled load-bearing device;

[0100] Figure 46 A side view showing another actuation component in the wheeled load-bearing device;

[0101] Figure 47 Show Figure 46 A three-dimensional view showing some structural details of the actuation components installed in the wheeled load-bearing device;

[0102] Figure 48 Show Figure 46 A cross-sectional view of a connecting member in the actuation assembly of a wheeled load-bearing device coupled to the wheel seat latch of the wheel assembly;

[0103] Figure 49 Show Figure 46 A cross-sectional view of another connecting member in the actuation assembly of a wheeled load-bearing device being coupled to a wheel seat latch of another wheel assembly;

[0104] Figure 50 A side view showing another embodiment of the wheeled load-bearing device;

[0105] Figure 51 Show Figure 50 A perspective view of the actuation components installed in the wheeled load-bearing device;

[0106] Figure 52 Show Figure 50 A cross-sectional view of a connecting member in the actuation assembly of a wheeled load-bearing device coupled to the wheel seat latch of the wheel assembly;

[0107] Figure 53 Show Figure 50 A cross-sectional view of another connecting member in the actuation assembly of a wheeled load-bearing device being coupled to a wheel seat latch of another wheel assembly;

[0108] Figure 54 Show Figure 50 A plan view of a portion of the actuation components installed in the wheeled load-bearing device;

[0109] Figure 55 Show Figure 50 A perspective view of a portion of the actuation components installed in a wheeled load-bearing device;

[0110] Figure 56 Show Figure 50 A perspective view of the connecting actuator of the actuation assembly installed in the wheeled load-bearing device;

[0111] Figure 57 Show Figure 50 A three-dimensional view of the coupling component fixedly connected to the pusher frame in the wheeled load-bearing device;

[0112] Figure 58 Show Figure 50 A perspective view of the coupling component mounted on the standing frame in the wheeled load-bearing device;

[0113] Figure 59 Show Figure 50 A cross-sectional view of the connecting actuator assembled between the coupler of the pusher frame and the coupler of the standing frame in a wheeled load-bearing device.

[0114] Figure 60 Show Figure 50 A partial sectional view of the operating section provided in the wheeled load-bearing device;

[0115] Figure 61 Showing a portion of the actuation component with Figure 60 A schematic diagram showing the coupling of the operating parts;

[0116] Figure 62 Show Figure 50 A side view of the wheeled load-bearing device, which includes another actuation component and another unlocking mechanism;

[0117] Figure 63 Show Figure 62 A perspective view of a portion of the standing frame in a wheeled load-bearing device pivotally connected to a pusher frame;

[0118] Figure 64 Show Figure 62 A schematic diagram of a connecting actuator and a connecting element in the actuation assembly installed in the wheeled load-bearing device;

[0119] Figure 65 Show Figure 64 A schematic diagram showing the coupling of the connecting parts to the wheel seat latching parts in the wheeled load-bearing device;

[0120] Figure 66 Show Figure 62 A schematic diagram of another connecting actuator and another connecting element of the actuation assembly installed in the wheeled load-bearing device;

[0121] Figure 67 Show Figure 66 A schematic diagram showing the coupling of the connecting member to the latching member of another wheel seat in the wheeled bearing device;

[0122] Figure 68 Show Figure 62 A perspective view of a portion of the actuation assembly of the wheeled load-bearing device that is mounted on the coupling member fixed to the pusher frame;

[0123] Figure 69 Show Figure 62 A schematic diagram of a portion of an actuation assembly provided in a wheeled load-bearing device, the actuation assembly including an actuating part that interacts with one of two connected actuators;

[0124] Figure 70 The actuating part of the actuating assembly is shown compared to Figure 69 The diagram shows the position displacement by an angle.

[0125] Figure 71 Show Figure 62 A schematic diagram of the operating unit provided in the wheeled load-bearing device;

[0126] Figure 72 Show Figure 62 A perspective view showing the structural details of the unlocking mechanism in the wheeled load-bearing device;

[0127] Figure 73 Show Figure 62 A perspective view of a portion of the coupling component in the unlocking mechanism of the wheeled load-bearing device, which is located in the pusher frame;

[0128] Figure 74 Show Figure 62 A perspective view of other structural details of the unlocking mechanism installed in the wheeled load-bearing device;

[0129] Figure 75 Show Figure 62 A schematic diagram showing the pusher and unlocking mechanism in a wheeled load-bearing device positioned to interact with one of the two connected actuators of the actuation assembly.

[0130] Figure 76 Show Figure 62 The unlocking mechanism in the wheeled load-bearing device is located in a cross-sectional view at another position suitable for interacting with the other of the two connected actuators of the actuation assembly;

[0131] Figure 77 Show Figure 62 The unlocking mechanism in the wheeled load-bearing device is located at Figure 75 The diagram shows a cross-sectional view of a position suitable for interacting with one of the two connected actuators of the actuation assembly; and

[0132] Figure 78 The unlocking mechanism is shown to be set in Figure 77A cross-sectional view of the position and the mechanism operated to cause the connecting actuator to move in order to unlock the wheel seat latch it is coupled with. Detailed Implementation

[0133] This application provides a wheeled carrier comprising a stand and a plurality of wheel assemblies disposed at the bottom of the stand. The wheel assemblies are controllably lockable and unlockable relative to the horizontal direction of the stand, wherein an unlocked wheel assembly can pivot relative to the stand to change the horizontal direction of its wheel axis. Depending on the requirements, some wheel assemblies may be locked while others are simultaneously unlocked; or, all wheel assemblies may be unlocked simultaneously as needed. Accordingly, the wheeled carrier is more flexible in use and has better mobility. Embodiments of the wheeled carrier described herein include strollers. However, it is understood that wheeled carriers incorporating the structures and features described herein may include, but are not limited to, strollers, trolleys, shopping carts, etc. Accordingly, it should be understood that the structures and features described herein can be applied to any product type with wheels, and the wheeled carrier described and claimed herein is not limited to the examples described later.

[0134] Figure 1-5 For different schematic diagrams, one embodiment of the wheeled carrier 10 is shown, exemplified as a stroller. (See also...) Figure 1-5 The wheeled support device 10 may include a support structure 11, which includes a standing frame 12 and a pusher frame 14 coupled to each other, and a plurality of wheel assemblies 16, 18 disposed at the bottom of the standing frame 12.

[0135] According to one structural example, the standing frame 12 may include two legs 20 and 22, two side connecting rods 24, and two side support rods 26. Leg 20 may be a rear leg, for example, and leg 22 may be a front leg, for example. Each of the legs 20 and 22 may include two side sections symmetrically arranged on the left and right sides of the standing frame 12, such as the two side sections 20A of leg 20 and the two side sections 22A of leg 22, and a horizontal section fixed to the two side sections, such as the horizontal section 20B fixed to the two side sections 20A in leg 20 and the horizontal section 22B fixed to the two side sections 22A in leg 22. On each of the left and right sides, side segment 20A of leg 20 and side segment 22A of leg 22 can be pivotally coupled to side connecting rod 24, respectively, while side support rod 26 can extend between side segments 20A and 22A and can be pivotally coupled to side segment 22A, so that legs 20 and 22, side connecting rod 24 and side support rod 26 can pivot relative to each other when the wheeled load-bearing device 10 is folded and unfolded.

[0136] The pusher frame 14 can be pivotally coupled to the standing frame 12 via two linkage mechanisms 28, wherein each linkage mechanism 28 may include a rod 28A, the two ends of which are pivotally connected to the standing frame 12 and the pusher frame 14, respectively. Specifically, the pusher frame 14 may include two side portions 14A symmetrically arranged on the left and right sides, and a grip portion 14B connecting the two side portions 14A. On each of the left and right sides, the side portion 14A of the pusher frame 14 can be pivotally connected to the side connecting rod 24, pivotally connected to the side support rod 26, and pivotally coupled to the side section 20A of the leg frame 20 via the rod 28A, wherein the two ends of the rod 28A are pivotally connected to the side portion 14A of the pusher frame 14 and the side section 20A of the leg frame 20, respectively.

[0137] Reference Figure 1-5 Each of the wheel assemblies 16 and 18 may include a wheel seat pivotally connected to the stand 12 and mounting at least one wheel, the wheel being pivotable relative to the wheel seat about a generally horizontally extending wheel axis, thereby allowing the wheel seat to pivot relative to the stand 12 to change the direction of the wheel axis. For example, two wheel assemblies 16 may be located at the lower end of side section 20A of the leg 20, and two wheel assemblies 18 may be located at the lower ends of two side sections 22A of the leg 22, respectively. Each wheel assembly 16 may include a wheel seat 30 pivotally connected to the leg 20 and mounting at least one wheel 32, the wheel 32 being pivotable relative to the wheel seat 30 about a generally horizontally extending wheel axis 32A, thereby allowing the wheel seat 30 to pivot to change the horizontal direction of the wheel axis 32A. Similarly, each wheel assembly 18 may include a wheel seat 34 pivotally connected to the leg 22 and mounting at least one wheel 36, the wheel 36 being pivotable relative to the wheel seat 34 about a generally horizontally extending wheel axis 36A, thereby allowing the wheel seat 34 to pivot and change the horizontal orientation of the wheel axis 36A. The wheel seats 30, 34 are spaced apart along a longitudinal axis extending from the rear to the front of the wheel-bearing device 10.

[0138] Reference Figure 3 and Figure 5 The two wheel assemblies 16 may have the same structure. In each wheel assembly 16, the wheel seat 30 may be pivotally connected to the leg 20 via a pivot 31, allowing the wheel seat 30 and the wheel 32 mounted therein to pivot synchronously about the pivot 31. According to one structural example, the wheel seat 30 may include a housing 33, which is pivotally connected to the leg 20 via the pivot 31. An axle 35 defining the wheel axis 32A may be provided through the housing 33 to pivotally connect the wheel 32 to the wheel seat 30. According to one structural example, the axle 35 may be configured to slide vertically via a slider 37 assembled inside the housing 33, and a spring 38 may be connected to both the slider 37 and the housing 33. The spring 38 can buffer the vertical displacement of the wheel 32 relative to the wheel seat 30, dissipating undue impact energy during use.

[0139] Reference Figure 3 and Figure 5 The locking assembly 39 is used to pivotally lock and unlock the wheel seat 30 relative to the stand 12. The locking assembly 39 may include a wheel seat latch 40 and a locking spring 42, the wheel seat latch 40 being movably connected to the stand 12, and the locking spring 42 being connected to the wheel seat latch 40. According to one structural embodiment, the wheel seat latch 40 may slide against a side section 20A of the stand 20. Specifically, the side section 20A may have a cavity 44, and the wheel seat latch 40 may have an elongated shape that is slidably received within the cavity 44, allowing the wheel seat latch 40 to slide out or retract into the cavity 44. The cavity 44 may have an opening 44A, which is narrower than the interior of the cavity 44, and the wheel seat latch 40 may have an inner portion larger than its outer portion, the outer portion being movable through the opening 44A of the cavity 44, thereby preventing the wheel seat latch 40 from falling out of the cavity 44.

[0140] The locking spring 42 can be disposed within the cavity 44, and both ends of the locking spring 42 can be connected to the side section 20A and the wheel seat latch 40, respectively. The locking spring 42 can bias the wheel seat latch 40 so that it protrudes from the cavity 44 to engage with the wheel seat 30.

[0141] In the locking assembly 39, the wheel seat latch 40 can slide downwards to engage with an opening 46 provided in the housing 33 of the wheel seat 30, thereby pivotally locking the wheel seat 30 to the stand 12; and the wheel seat latch 40 can slide upwards to disengage from the opening 46 of the wheel seat 30, thereby unlocking the wheel seat 30 and allowing the wheel seat 30 to pivot relative to the stand 12. The locking spring 42 can apply a biasing force to engage the wheel seat latch 40 with the wheel seat 30. The locking assembly 39, as described above, can be provided for each of the two wheel assemblies 16.

[0142] Reference Figure 1-5 The wheel-type load-bearing device 10 may further include an actuation assembly 48 and an unlocking mechanism 52. The actuation assembly 48 is coupled to the wheel seat latch 40 and includes one or more connecting members 50. The unlocking mechanism 52 includes an operating part 54, which is disposed on the support structure 11 at a distance from the wheel seat latch 40. According to a structural example, the actuation assembly 48 may include a connecting actuator 56 and two connecting members 50. The connecting actuator 56 is movably connected to the support structure 11, and the two connecting members 50 respectively couple the wheel seat latches 40 of the two wheel assemblies 16 to the connecting actuator 56.

[0143] The connecting actuator 56 can be movably connected to any suitable part of the support structure 11, such as the stand 12, the pusher 14, or the linkage 28 that couples the pusher 14 to the stand 12. According to one structural example, the connecting actuator 56 can be movably connected to the linkage 28. For example, the connecting actuator 56 can slide with the link 28A of the linkage 28, and can be a single component sliding relative to the link 28A.

[0144] The two connecting members 50 may include cable portions and may be disposed along at least a portion of the support structure 11. For example, the two connecting members 50 may include two cable portions consisting of two different cables, each having one end anchored to a corresponding wheel seat latch 40 and the other end anchored to a connecting actuator 56. According to another structural embodiment, the two connecting members 50 may include two cable portions consisting of a single cable, with both ends of the single cable anchored to two wheel seat latches 40 respectively, and the middle portion of the single cable connected to the connecting actuator 56. Therefore, the connecting actuator 56 can move in a first direction to pull each connecting member 50 and cause the corresponding wheel seat latch 40 to disengage from the wheel seat 30, and can move in a second direction opposite to the first direction to relax each connecting member 50 so that the corresponding wheel seat latch 40 can engage with the wheel seat 30 by the biasing force of the locking spring 42.

[0145] Reference Figure 1 , 4 5. The unlocking mechanism 52 can be operated to cause the actuation component 48 to pull each wheel seat latch 40, thereby disengaging the wheel seat latch 40 from the wheel seat 30. According to one structural example, the unlocking mechanism 52 may include an operating part 54, which is disposed on the pusher frame 14 and coupled to the actuation component 48. The operating part 54 may be disposed on one side portion 14A, such as... Figure 1 and Figure 4 As shown; or on the grip portion 14B of the pusher frame 14 (not shown). The operating part 54 is movably connected to the pusher frame 14 and can be moved relative to the pusher frame 14 as a single component. For example, the operating part 54 can slide with the pusher frame 14 and can slide along the longitudinal axis of the side portion 14A of the pusher frame 14. According to a structural embodiment, the unlocking mechanism 52 may include a connecting member 58 that couples the operating part 54 to the actuation assembly 48. For example, the connecting member 58 may include a cable that couples the operating part 54 to the connecting actuator 56 of the actuation assembly 48, wherein the two ends of the cable are anchored, for example, to the operating part 54 and the connecting actuator 56, respectively. With this structure, the caregiver can move the connecting actuator 56 by sliding the operating part 54, thereby pulling the wheel seat latches 40 to disengage the wheel seat latches 40 from the wheel seat 30, so that the wheel seat 30 can pivot relative to the stand 12.

[0146] Cooperate Figure 1-5, Figure 6 and Figure 7 Two partial cross-sectional views showing variations in the structure of the unlocking mechanism 52. (Refer to...) Figure 6 and Figure 7 The connecting member 58 of the unlocking mechanism 52 can be connected to the connecting actuator 60, and the connecting actuator 60 is slidably engaged with the pusher frame 14. The connecting member 58 may include a cable coupled to the connecting actuator 56 of the actuation assembly 48, as described above. The connecting actuator 60 may be disposed adjacent to the operating part 54 and is slidable along the longitudinal axis of the side portion 14A of the pusher frame 14. The operating part 54 may be slidably or pivotally engaged with the pusher frame 14 and may slidably contact the connecting actuator 60 during operation. For example, the connecting actuator 60 may have a ramp 62, and the operating part 54 may have a protrusion 64 that slidably contacts the ramp 62. Figure 7 As shown, when the caregiver presses the operating part 54, the connecting actuator 60 can slide upward through the sliding contact between the inclined surface 62 and the protrusion 64, thereby causing the connecting actuator 56 to move. This can pull the wheel seat latches 40 and disengage the wheel seat latches 40 from the wheel seat 30, so that the unlocked wheel seat 30 can pivot relative to the stand frame 12.

[0147] Cooperate Figure 1-5 , Figure 8 and Figure 9 A partial cross-sectional view of another variation of the two unlocking mechanisms 52 is shown. (Refer to...) Figure 8 and Figure 9 The operating part 54 of the unlocking mechanism 52 may include a rotating drum 66, which is pivotally connected to the pusher frame 14. According to one structural embodiment, the operating part 54 including the rotating drum 66 may be a single component, allowing the operating part 54 and the rotating drum 66 to pivot synchronously relative to the pusher frame 14. As previously described, the operating part 54 may be coupled to the actuation assembly 48 via a connecting member 58. The connecting member 58 may include a cable that couples the operating part 54 to the connecting actuator 56 of the actuation assembly 48, wherein the two ends of the cable are anchored, for example, to the rotating drum 66 of the operating part 54 and the connecting actuator 56, respectively. Figure 9 As shown, the caregiver can pivot the rotating drum 66 relative to the pusher frame 14 by operating the operating part 54 to retract at least part of the connecting member 58 and cause the connecting actuator 56 to move, thereby pulling the wheel seat latches 40 to disengage the wheel seat latches 40 from the wheel seat 30, so that the wheel seat 30 can pivot relative to the stand frame 12.

[0148] The following will refer to Figure 1-9The following describes an exemplary operation of the wheeled support device 10. When the wheel seat 30 needs to be freely pivotable relative to the stand 12, the caregiver can actuate the operating part 54 to disengage the wheel seat latch 40 from the corresponding wheel seat 30, thereby unlocking the wheel seat 30 and allowing it to freely pivot relative to the stand 12 to change the horizontal direction of the wheel axis 32A. The wheel seat 30 remains unlocked as long as the operating part 54 is not released. With all wheel seats 30, 34 pivotable relative to the stand 12, the wheeled support device 100 can be operated more flexibly.

[0149] When normal use is required, each wheel seat 30 can be pivoted to a normal position, so that the wheel axle 32A is transverse and approximately orthogonal to the longitudinal axis extending from the rear to the front of the wheel-type load-bearing device 10. Then, the operating unit 54 can be released, allowing the wheel seat latch 40 to engage with the wheel seat 30 by the biasing force of the locking spring 42. The wheel seat 30 can thus be locked to the stand 12. When each wheel seat latch 40 moves to the locked state, the operating unit 54 can be moved to the initial position via the transmission of the connecting members 50 and 58.

[0150] Figure 10-16 For different schematic diagrams, an embodiment of the wheeled load-bearing device 10 is shown, which includes an actuation component 68 and an unlocking mechanism 70 that can respectively replace the aforementioned actuation component 48 and unlocking mechanism 52. (Refer to...) Figure 10-15 The actuation assembly 68 may include two connecting members 50 and two connecting actuators 72. The two connecting members 50 are respectively connected to two wheel seat latches 40 as described above, and the two connecting actuators 72 are movably connected to the support structure 11. Specifically, the two connecting actuators 72 are movably connected to the cross section 20B of the leg 20, and each connecting member 50 couples one wheel seat latch 40 to one connecting actuator 72. The two connecting members 50 may include cable portions and may be respectively arranged along two side sections 20A of the leg 20 and pass through the cross section 20B. For example, the two connecting members 50 may include two cable portions, which are two different cables, each with one end anchored to the wheel seat latch 40 (preferably shown in…). Figure 15 The other end is anchored to the connecting actuator 72 (preferably shown in...). Figure 11 ).

[0151] Reference Figure 10 and Figure 11Two connecting actuators 72 can slide against the horizontal segment 20B of the leg 20. For example, the horizontal segment 20B of the leg 20 can be fixedly connected to the bracket 74, and the two connecting actuators 72 can be configured to slide laterally within the bracket 74 relative to the horizontal segment 20B. According to a structural example, the bracket 74 can have a base 74A and two mounting portions 74B, the base 74A being fixedly connected to the horizontal segment 20B, and the two mounting portions 74B protruding from the base 74A and parallel to each other, such that a gap 76 is defined between the two mounting portions 74B. The bracket 74, including the base 74A and the mounting portions 74B, can be a single integrally formed component. The two mounting portions 74B can have a hollow interior 74C, which is closed by a cover 78, and the two connecting actuators 72 can be respectively accommodated in the hollow interior 74C of the two mounting portions 74B and extend into the gap 76 through openings 74D provided in the mounting portions 74B.

[0152] The two connecting actuators 72 may have the same structure and may be symmetrically arranged in the two mounting portions 74B. According to one structural example, each connecting actuator 72 may be formed to include a main body 72A, an anchoring portion 72B, and a pin 72C. The main body 72A may be slidably supported in the mounting portion 74B, the anchoring portion 72B may be fixed to one end of the connecting member 50, and may enter the hollow interior 74C of the mounting portion 74B through a through hole provided in the cover 78, while the pin 72C may extend into the gap 76 through an opening 74D. In this way, the connecting actuator 72 may move in a first direction toward the gap 76 to pull the connecting member 50 and cause the corresponding wheel seat latch 40 to disengage from the wheel seat 30, and the connecting actuator 72 may move in a second direction opposite to the first direction to relax the connecting member 50 and allow the corresponding wheel seat latch 40 to engage with the wheel seat 30 by the biasing force of the locking spring 42.

[0153] Reference Figure 10-14The unlocking mechanism 70 may include an operating part 80 disposed on the stand 20. For example, the operating part 80 may be pivotally connected to a horizontal segment 20B of the stand 20. According to one structural embodiment, the operating part 80 is at least partially housed in a gap 76 and may be pivotally connected to a support 74 by a shaft (not shown) through a through hole 80A provided in the operating part 80 and two through holes 74E respectively provided in two coupling portions 74B of the support 74. Specifically, the operating part 80 may have a coupling portion 80B and an actuating portion 80C, wherein the coupling portion 80B is disposed in the gap 76 adjacent to two pins 72C connecting the actuators 72, and the actuating portion 80C protrudes from the gap 76. The through hole 80A may be disposed in the coupling portion 80B, and each of the two opposite sides of the coupling portion 80B may have a ramp A that is eccentric to the through hole 80A and slides in contact with the pins 72C connecting the actuators 72. The spring 82 can be configured to bias the connecting actuator 72 toward the gap 76, so that the connecting actuator 72 can maintain sliding contact with the inclined surface A of the operating part 80. The spring 82 can be provided in the mounting part 74B, and the opposite ends of the spring 82 can be connected to, for example, the connecting actuator 72 and the cover 78.

[0154] Due to the sliding contact between the inclined plane A and the connecting actuator 72, depending on the pivoting direction of the operating unit 80, the connecting actuator 72 can slide toward or away from the gap 76 to pull or release the connecting member 50, respectively. Accordingly, the operating unit 80 can pivot in one direction to engage and lock the wheel seat latch 40 with the wheel seat 30 by the biasing force of the locking spring 42, and can pivot in the opposite direction to disengage and unlock the wheel seat latch 40 from the wheel seat 30. Figure 15 The wheel seat 30 is shown in the locked state. Figure 16 This indicates that the wheel seat 30 is in the unlocked state. Since the operating unit 80 is similarly coupled to each of the two connecting actuators 72, the operating unit 80 can simultaneously drive the unlocking and locking of the two wheel seat latches 40 of the leg 20.

[0155] Figure 17-19 The accompanying drawings show modified structures of the actuation component 68' and unlocking mechanism 70' that can respectively replace the aforementioned actuation component and unlocking mechanism. (Refer to...) Figure 17-19The actuation assembly 68' may include two connecting members 50, which are connected to the two wheel seat latches 40 respectively as described above, but the two connecting actuators 72 are omitted. The unlocking mechanism 70' may include an operating part 86, which is disposed on one of the two side sections 20A of the leg 20 and connected to the connecting member 50. Specifically, the operating part 86 may include a rotating cylinder 88 pivotally connected to the side section 20A of the leg 20, and an actuating part 90 protruding from the rotating cylinder 88. According to a structural example, the operating part 86, including the rotating cylinder 88 and the actuating part 90, may be a single integrally formed component. The operating part 86 may be pivotally connected to the side section 20A of the leg 20 by a shaft (not shown), the shaft being a through hole 92 provided in the rotating cylinder 88.

[0156] Each connecting member 50 may, for example, comprise a single cable, one end of which is anchored to the rotating drum 88 of the operating part 86, and the opposite end of which is anchored to the wheel seat latch 40 (e.g. Figure 15 and Figure 16 (As shown). For example, the drum 88 may have two grooves 88A to anchor the ends of the two connectors 50 respectively. In this way, the drum 88 can pivot in one direction to unfold and loosen the connectors 50, so that the wheel seat latches 40 can engage and lock with the wheel seats 30 respectively by the biasing force of the locking springs 42; and the drum 88 can pivot in the opposite direction to wind up at least a portion of the connectors 50, so that the wheel seat latches 40 are pulled by the connectors 50 respectively and disengaged from the wheel seats 30 respectively.

[0157] Figure 20 and Figure 21 A schematic diagram shows another variation of the unlocking mechanism 93, which can replace the aforementioned unlocking mechanism. (Refer to...) Figure 20 and Figure 21 The unlocking mechanism 93 may include an operating section 94, which is mounted on the support structure of the wheel-mounted device. The operating section 94 may include a rotary drum 96 and a button 98, which are movably connected to the support structure (e.g., the grip portion 14B of the pusher frame 14). The rotary drum 96 may be pivotally connected to the grip portion 14B of the pusher frame 14 by a pivot 99. As previously described, each connecting member 50 may, for example, include a cable, one end of which is anchored to the rotary drum 96, and the opposite end of which is anchored to the wheel seat latch 40 (e.g., ...). Figure 15 and Figure 16(As shown). For example, the rotating cylinder 96 may have two radially opposite grooves 96A to anchor the ends of the two connecting members 50 respectively. In this way, the rotating cylinder 96 can pivot in one direction to release the connecting member 50, so that the wheel seat latch 40 can engage and lock with the wheel seat 30 by the biasing force of the locking spring 42; and the rotating cylinder 96 can pivot in the opposite direction to pull the connecting member 50, so that the wheel seat latch 40 is pulled by the connecting member 50 and disengaged from the wheel seat 30 respectively. The button 98 can slide with the grip portion 14B and can be pivotally connected to the rotating cylinder 96 at an eccentric position of the pivot 99. The button 98 can thus slide along a plane that is approximately orthogonal to the pivot 99. With this structure, button 98 can be operated to cause the rotating drum 96 to pivot and simultaneously pull the two connecting parts 50, thereby causing the wheel seat latch 40 to be pulled by the connecting parts 50 and disengage from the wheel seat 30 respectively.

[0158] Figure 22 A perspective view shows another embodiment of the wheeled carrier 100, exemplified by a stroller. (Refer to...) Figure 22 The wheeled support device 100 may include a support structure 102, which also includes a standing frame 12 and a pusher frame 14 coupled to each other. In the wheeled support device 100, the pusher frame 14 can pivot relative to the standing frame 12 between two different tilt angles to enable the wheeled support device 100 to be pushed in different directions, forward or backward, by a child. For example, the pusher frame 14 can tilt toward the side of the leg 20 in one position and toward the side of the leg 22 in another position.

[0159] In the wheeled support device 100, the side portion 14A of the pusher frame 14 is not pivotally connected to the side connecting rod 24. Therefore, the pusher frame 14 can pivot on the side connecting rod 24 to adjust the pusher frame 14 between two different tilt angles. The standing frame 12 of the wheeled support device 100 is similar to the standing frame of the aforementioned wheeled support device 10, and may also include a support rod 104 on the left and right sides respectively. The pusher frame 14 can also be coupled to the standing frame 12 on the left and right sides respectively via a linkage mechanism 28 including a rod body 28A. The upper part of the support rod 104 is pivotally connected to the side connecting rod 24, and the lower part of the support rod 104 is pivotally connected to the side support rod 26, the rod body 28A and the side portion 14A of the pusher frame 14 respectively via a common pivot axis R. The rod 28A can be pivotally connected to the side section 20A of the leg 20, and pivotally connected to the side section 14A of the pusher frame 14 via the pivot axis R. With this structure, the pusher frame 14 of the wheeled load-bearing device 100 can pivot about the pivot axis R relative to the standing frame 12 and the linkage mechanism 28 to adjust between two different tilt angles.

[0160] Reference Figure 22The standing frame 12 of the wheeled support device 100 may also include two wheel assemblies 16 mounted on the legs 20 and two wheel assemblies 18 mounted on the legs 22. Figure 22 , Figure 23 A cross-sectional view of a wheel assembly 16 is shown. (Refer to...) Figure 22 and Figure 23 The wheel assembly 16 may have the same structure as described above, and may include a wheel seat 30 pivotally connected to the stand 20, allowing the wheel seat 30 and its wheel 32 to pivot synchronously relative to the stand 20. The locking assembly 39, as described above, may be configured to pivotally lock and unlock the wheel seat 30 to the stand 12, wherein the locking assembly 39 may include a wheel seat latch 40 movably connected to the stand 12, and a locking spring 42 that biases the wheel seat latch 40 to engage with the wheel seat 30.

[0161] Cooperate Figure 22 , Figure 24 A magnified perspective view of a wheel assembly 18 is shown. (Refer to...) Figure 22 and Figure 24 The wheel assembly 18 may have the same structure as described above, including a wheel seat 34 pivotally connected to the leg 22, allowing the wheel seat 34 and its wheel 36 to pivot synchronously relative to the leg 22. Furthermore, the locking assembly 110 may be configured to pivotally lock and unlock the wheel seat 34 to the stand 12. The locking assembly 110 may have a similar structure to the locking assembly 39 of the wheel assembly 16. According to one structural example, the locking assembly 110 may include a wheel seat latch 112 movably connected to the stand 12, and a locking spring 114 connected to the wheel seat latch 112. For example, the wheel seat latch 112 may slide against a side section 22A of the leg 22, and both ends of the locking spring 114 may be connected to the side section 22A and the wheel seat latch 112, respectively. Therefore, the wheel seat latch 112 can slide downwards to engage with the wheel seat 34, thereby pivotally locking the wheel seat 34 to the stand 12; and the wheel seat latch 112 can slide upwards to disengage from the wheel seat 34 and unlock, thereby allowing the wheel seat 34 to pivot freely relative to the stand 12 and change the horizontal direction of the wheel axis 36A. The locking spring 114 can bias the wheel seat latch 112 to engage with the wheel seat 34.

[0162] Cooperate Figure 22-24 , Figure 25-27 A schematic diagram showing a further detailed structure of the wheeled load-bearing device 100 is provided. (Refer to...) Figure 22-27 The wheeled load-bearing device 100 may also include an actuation assembly 120 coupled to the wheel seat latches 40 and 112, and an unlocking mechanism 122 including an operation part 124, wherein the operation part 124 is disposed in the support structure 102 away from the wheel seat latches 40 and 112.

[0163] The actuation assembly 120 may include a connecting actuator 126 and connecting members 128 and 130. The connecting actuator 126 is movably connected to the stand frame 12. The connecting member 128 couples the wheel seat latch 40 to the connecting actuator 126. The connecting member 130 couples the wheel seat latch 112 to the connecting actuator 126. The wheel seat latches 40 and 112 correspond to the wheel assemblies 16 and 18 located on the same side (i.e., the left or right side) of the wheel-type load-bearing device 100, respectively.

[0164] The connecting actuator 126 is configured to move in a first direction to pull the connecting member 130 and disengage the wheel seat latch 112 from the wheel seat 34, while simultaneously releasing the connecting member 128 to engage the wheel seat latch 40 with the wheel seat 30; and to move in a second direction opposite to the first direction to pull the connecting member 128 and disengage the wheel seat latch 40 from the wheel seat 30, while simultaneously releasing the connecting member 130 to engage the wheel seat latch 112 with the wheel seat 34. The connecting actuator 126 is movable in either the first or second direction in response to pivoting of the pusher frame 14 relative to the stand frame 12 between a first position and a second position with different tilt angles. According to one structural embodiment, the connecting actuator 126 can be pivotally connected to the stand frame 12 via a pivot axis R, and can be a single component pivoting relative to the stand frame 12 in both the first and second directions. For example, the connecting actuator 126 may be pivotally supported by the support rod 104 of the stand 12 and may be located adjacent to the side 14A of the pusher frame 14 or the stand 12. Suitable structures for the connecting actuator 126 may include, but are not limited to, a turntable, lever, etc.

[0165] Reference Figure 22-27The two connectors 128 and 130 may include cable portions and may be arranged along the stand 12. According to one structural example, the two connectors 128 and 130 may each include two cable portions, which are composed of two separate cables that respectively couple the wheel seat latches 40 and 112 to the connecting actuator 126. For example, connector 128 may include a cable having one end 128A anchored to the wheel seat latch 40 and the other end 128B anchored to the connecting actuator 126, and connector 130 may include a cable having one end 130A anchored to the wheel seat latch 112 and the other end 130B anchored to the connecting actuator 126. The path of connector 128 may, for example, extend from the wheel seat latch 40 along the side section 20A of the stand 20, the side connecting rod 24, and the carrier rod 104 to the connecting actuator 126. The path of the connecting member 130 may extend from the wheel seat latch 112 along the side section 22A of the leg 22, the side connecting rod 24, and the carrier rod 104 to the connecting actuator 126. In this way, the connecting actuator 126 can pivot in a first direction to pull the connecting member 130 and cause the wheel seat latch 112 to disengage from the wheel seat 34 and unlock, while simultaneously releasing the connecting member 128 so that the wheel seat latch 40 can engage with the wheel seat 30 and lock; and the connecting actuator 126 can pivot in a second direction opposite to the first direction to pull the connecting member 128 and cause the wheel seat latch 40 to disengage from the wheel seat 30 and unlock, while simultaneously releasing the connecting member 130 so that the wheel seat latch 112 can engage with the wheel seat 34 and lock.

[0166] Reference Figure 22-27 The actuation assembly 120 may further include two springs 132 and 134 respectively connected to the connecting actuator 126. Specifically, each of the two springs 132 and 134 may have its ends connected to the connecting actuator 126 and the carrier rod 104 respectively, and the two springs 132 and 134 may each provide two biasing forces in different directions. For example, spring 132 may bias the connecting actuator 126 to pivot in a first direction relative to the stand 12 and the pusher 14 to pull the connecting member 130 and release the connecting member 128, while spring 134 may bias the connecting actuator 126 to pivot in a second direction relative to the stand 12 and the pusher 14 to pull the connecting member 128 and release the connecting member 130.

[0167] Reference Figure 22-27When the pusher frame 14 is in either the first or second position, the unlocking mechanism 122 can be operated to simultaneously unlock the wheel seats 30 and 34. According to one structural example, the unlocking mechanism 122 may include an operating part 124 and a coupling member 136 connected via a cable 138. The operating part 124 may be disposed on the gripping part 14B of the pusher frame 14, while the coupling member 136 may be supported by the side 14A of the pusher frame 14. The coupling member 136 is movable relative to the pusher frame 14 and the connecting actuator 126 between a first state and a second state. When the coupling member 136 is in the first state, the connecting actuator 126 and the pusher frame 14 are coupled to each other and can pivot synchronously about the pivot axis R; when the coupling member 136 is in the second state, the connecting actuator 126 can pivot about the pivot axis R relative to the standing frame 12 and the pusher frame 14.

[0168] According to one structural example, the connecting actuator 126 may have a generally V-shaped slot 140 and a notch 142 located at the bottom of the slot 140. Two connecting members 128 and 130 may be anchored to the connecting actuator 126 on both sides of the slot 140, respectively. The coupling member 136 may engage with the notch 142 in a first state and disengage from the notch 142 in a second state. According to one structural example, the coupling member 136 may be slidably connected to the pusher frame 14. For example, the coupling member 136 may include a main body 144 slidably connected to a side 14A of the pusher frame 14, and a pin 146 fixed to the main body 144 and laterally protruding from the main body 144. Therefore, the coupling member 136 may slide relative to the pusher frame 14 between a first state in which the corresponding pin 146 engages with the notch 142 and a second state in which the corresponding pin 146 disengages from the notch 142. The engagement of the coupling element 136 with the connecting actuator 126 in the first state prevents the connecting actuator 126 from pivoting relative to the pusher frame 14. When the coupling element 136 is in the second state and disengaged from the notch 142, the connecting actuator 126 can pivot relative to the stand frame 12 and the pusher frame 14 by the biasing force of the springs 132 or 134.

[0169] Reference Figure 22-27 The unlocking mechanism 122 may also include a spring 148 to bias the coupling member 136 toward a first state of engagement with the connecting actuator 126. For example, the two ends of the spring 148 may be connected to the main body 144 of the coupling member 136 and the side 14A of the pusher bracket 14, respectively.

[0170] Cooperate Figure 22-27 , Figure 28 An enlarged view showing the detailed structure of the operation unit 124 is provided. (Refer to...) Figure 22 and Figure 28The operating unit 124 may include a rotating drum 150 and a button 152. The rotating drum 150 may be pivotally connected to the grip portion 14B of the pusher frame 14, and one end of the cable 138 may be anchored to the rotating drum 150. The button 152 may be slidably connected to the grip portion 14B and pivotally connected to the rotating drum 150. Therefore, the button 152 may be pressed to cause the rotating drum 150 to pivot and pull the cable 138, thereby causing the coupling member 136 to move against the biasing force of the spring 148 and disengage from the connecting actuator 126.

[0171] Since the wheeled load-bearing device 100 has two wheel assemblies 16 and 18 on the left and right sides respectively, the actuation assembly 120 and the unlocking mechanism 122 can be symmetrically arranged on the left and right sides and coupled to the operation part 124.

[0172] With the aforementioned structure, the pusher 14 can pivot between a first position and a second position when the coupling member 136 is in a first state. In the first position, the pusher 14 is tilted toward the side of the leg 20, and in the second position, it is tilted toward the side of the leg 22. Accordingly, when the pusher 14 pivots from the second position to the first position, the connecting actuator 126 can pivot synchronously with the pusher 14 in a first direction to pull the connecting member 130 and release the connecting member 128, thereby disengaging the wheel seat latch 112 from the wheel seat 34 and unlocking it, while engaging and locking the wheel seat latch 40 with the wheel seat 30. Conversely, when the pusher frame 14 pivots from the first position to the second position, the connecting actuator 126 can pivot synchronously with the pusher frame 14 in the second direction to pull the connecting member 128 and release the connecting member 130, thereby causing the wheel seat latch 40 to disengage from the wheel seat 30 and unlock, and causing the wheel seat latch 112 to engage with the wheel seat 34 and lock.

[0173] When the pusher arm 14 is in the first position and the operating part 124 is released, the biasing force of the spring 148 maintains the coupling member 136 in the first state of engagement with the connecting actuator 126. The wheel seat latch 40 engages with the wheel seat 30, locking the wheel seat 30 to the stand 12. The wheel seat latch 112 and the wheel seat 34 are disengaged at an initial distance, thereby unlocking the wheel seat 34 and allowing it to pivot freely relative to the stand 12. In the first position of the pusher arm 14, the elastic energy stored in the spring 134 can be higher than the elastic energy stored in the spring 132. To unlock wheel seats 30 and 34 when the pusher arm 14 is in the first position, the caregiver can move the coupling member 136 relative to the pusher arm 14 from the first state to the second state via the actuation unit 124. This causes the connecting actuator 126, biased by the spring 134, to pivot in the second direction and pull the connecting member 128, thereby disengaging the wheel seat latch 40 from the wheel seat 30. The angle at which the connecting actuator 126 displaces in the second direction to disengage the wheel seat latch 40 from the wheel seat 30 also causes a limited displacement of the wheel seat latch 112 toward the wheel seat 34, which is shorter than the initial distance. Therefore, the wheel seat latch 112 and the wheel seat 34 can still remain disengaged. Thus, in the first position of the pusher arm 14, all wheel seats 30 and 34 can be unlocked simultaneously.

[0174] When the pusher arm 14 is in the second position and the operating part 124 is released, the biasing force of the spring 148 maintains the coupling member 136 in the first state of engagement with the connecting actuator 126. The wheel seat latch 112 engages with the wheel seat 34, locking the wheel seat 34 to the stand 12. The wheel seat latch 40 and the wheel seat 30 are disengaged at an initial distance, thereby unlocking the wheel seat 30 and allowing it to pivot freely relative to the stand 12. In the second position of the pusher arm 14, the elastic energy stored in the spring 132 may be higher than the elastic energy stored in the spring 134. To unlock wheel seats 30 and 34 when the pusher arm 14 is in the second position, the caregiver can move the coupling member 136 relative to the pusher arm 14 from the first state to the second state via the actuation unit 124. This causes the connecting actuator 126, biased by the spring 132, to pivot in the first direction and pull the connecting member 130, thereby disengaging the wheel seat latch 112 from the wheel seat 34. The angle by which the connecting actuator 126 displaces in the first direction to disengage the wheel seat latch 112 from the wheel seat 34 also causes a limited displacement of the wheel seat latch 40 towards the wheel seat 30, which is shorter than the initial distance. Therefore, the wheel seat latch 40 and the wheel seat 30 can still remain disengaged. Thus, in the second position of the pusher arm 14, all wheel seats 30 and 34 can be unlocked simultaneously.

[0175] Figures 29-31 A schematic diagram of an embodiment in which the aforementioned actuator 120 is replaced by actuator 120' is shown. (Refer to...) Figures 29-31The actuation assembly 120' may include a connecting actuator 126, two connecting members 128 and 130, and two springs 132 and 134. The two connecting members 128 and 130 respectively couple the wheel seat latches 40 and 112 to the connecting actuator 126, and the two springs 132 and 134 are respectively connected to the connecting actuator 126. The connecting actuator 126 in the actuation assembly 120' may be generally similar to the connecting actuator 126 in the actuation assembly 120, and also includes a guide groove 160 having an arc shape centered on the pivot axis R. Furthermore, the two connecting members 128 and 130 in the actuation assembly 120' may be composed of a single continuous cable, with its two ends anchored to the anchoring openings 162 provided in the wheel seat latches 112 and the connecting actuator 126 respectively, and its middle portion surrounding and slidingly contacting the wheel seat latches 40. As described above, the connecting actuator 126 of the actuation assembly 120' can pivot synchronously with the pusher frame 14 while the coupling member 136 is engaged with the connecting actuator 126, so as to switch the locking state between the wheel seat latches 40 and 112. The coupling member 136 can disengage from the connecting actuator 126, allowing the connecting actuator 126 to pivot by the biasing force of the springs 132 or 134, so as to unlock all the wheel seat latches 40 and 112 simultaneously. When the wheel-type load-bearing device 100 is folded for easy storage, the pin 146 of the coupling member 136 can slide along the guide groove 160.

[0176] The suitable mechanism used to actuate the connecting actuator 126 is not limited to a spring mechanism. According to a variation, the connecting actuator 126 can be connected to and driven by a drive member (not shown) having a first state and a second state, wherein the drive member, in the second state, actuates the pivoting of the connecting actuator 126. According to this variation, opposite ends of a single cable 138 are respectively connected to an operating part 124 and the drive member, allowing a caregiver to move the drive member relative to the pusher frame 14 or the stand 12 from the first state to the second state via actuating the operating part 124. This causes the connecting actuator 126, driven by the drive member, to move in a second direction and pull the connecting member 128 or 130 to disengage the wheel seat latch from the wheel seat.

[0177] Figure 32-39 A schematic diagram of another embodiment of a wheeled support device 200 for a stroller is shown. (Refer to...) Figure 32-39 The wheeled load-bearing device 200 may have a support structure 102, wheel assemblies 16 and 18, and locking assemblies 39 and 110, as previously referenced. Figure 22-24 The device may also include an actuation component 220 and an unlocking mechanism 222, which may replace the actuation component 120 and unlocking mechanism 122 in the aforementioned embodiments.

[0178] Reference Figure 32-39The actuation assembly 220 may include a connecting actuator 226 movably connected to the stand 12, a connecting member 228 coupling the wheel seat latch 40 to the connecting actuator 226, and a connecting member 230 coupling the wheel seat latch 112 to the connecting actuator 226. The wheel seat latches 40 and 112 correspond to the wheel assemblies 16 and 18 located on the same side (i.e., the left or right side) of the wheeled load-bearing device 200, respectively. The connecting actuator 226 can move in a first direction to pull the connecting member 230 and disengage the wheel seat latch 112 from the wheel seat 34, while simultaneously releasing the connecting member 228 to engage the wheel seat latch 40 with the wheel seat 30; and the connecting actuator 226 can move in a second direction opposite to the first direction to pull the connecting member 228 and disengage the wheel seat latch 40 from the wheel seat 30, while simultaneously releasing the connecting member 230 to engage the wheel seat latch 112 with the wheel seat 34; the connecting actuator 226 can move in either the first or second direction in response to pivoting of the pusher frame 14 relative to the stand frame 12 between a first position and a second position with different tilt angles. According to this embodiment, the connecting actuator 226 can be pivotally connected to the stand frame 12 via a pivot axis R, and can be a single component that pivots relative to the stand frame 12 in both the first and second directions. According to one structural example, the side 14A of the pusher frame 14 can be fixedly connected to the shaft 232 extending along the pivot axis R, and the connecting actuator 226 can be configured adjacent to the support rod 104. The connecting actuator 226 can be pivotally coupled to the pusher frame 14 via a through hole 226A provided in the shaft 232, thereby allowing the connecting actuator 226 and the pusher frame 14 to pivot synchronously about the pivot axis R. Suitable structures for the connecting actuator 226 may include, but are not limited to, a turntable, a ring, etc.

[0179] Reference Figure 32-39The two connectors 228 and 230 may include cable portions, which may be separate cables or defined from a single cable, and may be configured along the stand 12. According to one structural example, the two connectors 228 and 230 may each include two cable portions that respectively couple wheel seat latches 40 and 112 to the connecting actuator 226. For example, connector 228 may include a cable portion anchored to the connecting actuator 226 via connector 234 and anchored at one end to wheel seat latch 40, while connector 230 may include a cable portion anchored to the connecting actuator 226 via connector 234 and anchored at one end to wheel seat latch 112. The path of connector 228 may, for example, extend from wheel seat latch 40 along the side section 20A of the stand 20, the side connecting rod 24, and the carrier rod 104 to the connecting actuator 226. The path of the connecting member 230 may extend, for example, from the wheel seat latch 112 along the side section 22A of the leg 22, the side connecting rod 24, and the carrier rod 104 to the connecting actuator 226. The connecting members 228 and 230 may extend substantially parallel to each other along the carrier rod 104. According to one structural example, the two connecting members 228 and 230 may be defined by a single cable, thereby constituting a single connecting member, the middle portion of which surrounds the connecting actuator 226, and the first and second ends are anchored to the wheel seat latch 40 and the wheel seat latch 112, respectively. In this manner, the connecting actuator 226 can pivot synchronously with the pusher frame 14 in a first direction to pull the connecting member 230 and cause the wheel seat latch 112 to disengage from the wheel seat 34 and unlock, while simultaneously releasing the connecting member 228 so that the wheel seat latch 40 can engage with the wheel seat 30 and lock; and the connecting actuator 226 can pivot synchronously with the pusher frame 14 in a second direction opposite to the first direction to pull the connecting member 228 and cause the wheel seat latch 40 to disengage from the wheel seat 30 and unlock, while simultaneously releasing the connecting member 230 so that the wheel seat latch 112 can engage with the wheel seat 34 and lock.

[0180] Reference Figure 32-39 The unlocking mechanism 222 may include an operating part 224 disposed on the grip portion 14B of the pusher frame 14, the structure of which may be similar to the aforementioned operating part 124. When the pusher frame 14 is in either the first position or the second position, the unlocking mechanism 222 can also be operated to simultaneously unlock the wheel seats 30 and 34. For this purpose, the actuation assembly 220 may also include a cable assembly 236, which couples the operating part 224 to the wheel seat latches 40 and 112 and decouples it from the connecting actuator 226, thereby allowing the operating part 224 to be operated to pull the cable assembly 236 to simultaneously disengage the wheel seat latches 40 and 112 from the wheel seats 30 and 34.

[0181] According to one structural example, the cable assembly 236 may include a slider 238, two cable portions 240 and 242 connected to the slider 238, and a cable 244 connected to the slider 238 and the operating part 224 respectively. The slider 238 may be configured to be adjacent to the carrier 104 and slidable along the longitudinal axis of the carrier 104. The two cable portions 240 and 242 may be two separate cables connected to the slider 238 respectively, or defined by a single cable contacting and surrounding the slider 238. The cable portion 240 may also be connected to the connector 228 or the wheel seat latch 40, while the cable portion 242 may also be connected to the connector 230 or the wheel seat latch 112. Figure 37 In the structure shown, the two cable sections 240 and 242 can be connected to the connectors 228 and 230 respectively via two fasteners 246. Figure 38 In the illustrated variant structure, the two cable portions 240 and 242 may each have two ends that are repeated and connected to the wheel seat latches 40 and 112, respectively, by the connectors 228 and 230. The cable portion 240 and the connector 228 may be guided close to each other by the sleeve 248, while the cable portion 242 and the connector 230 may be guided close to each other by another sleeve 248. Figure 39 In another variation shown, the two cable portions 240 and 242 may each have two ends that are repeated in connection with the connecting members 228 and 230 and the wheel seat latches 40 and 112, respectively. The two connecting members 228 and 230 and the two cable portions 240 and 242 may be guided separately from each other by four separate sleeves 250.

[0182] In the wheeled load-bearing device 200, the pusher frame 14 is tilted towards the side of the leg 20 in the first position and towards the side of the leg 22 in the second position. When the pusher frame 14 pivots from the second position to the first position, the connecting actuator 226 pivots synchronously with the pusher frame 14 in the first direction, pulling the connecting member 230 and releasing the connecting member 228, thereby disengaging the wheel seat latch 112 from the wheel seat 34 and locking the wheel seat latch 40 into the wheel seat 30. Conversely, when the pusher frame 14 pivots from the first position to the second position, the connecting actuator 226 pivots synchronously with the pusher frame 14 in the second direction, pulling the connecting member 228 and releasing the connecting member 230, thereby disengaging the wheel seat latch 40 from the wheel seat 30 and locking the wheel seat latch 112 into the wheel seat 34.

[0183] Since the wheeled load-bearing device 200 has two wheel assemblies 16 and 18 on the left and right sides respectively, the actuation assembly 220 can be symmetrically arranged on the left and right sides and is also coupled to the operation part 224.

[0184] When the pusher frame 14 is in the first position and the operating part 224 is released, the wheel seat latch 40 engages with the wheel seat 30, locking the wheel seat 30 to the stand frame 12, while the wheel seat latch 112 remains disengaged from the wheel seat 34 at an initial distance, thus unlocking the wheel seat 34 and allowing it to pivot freely relative to the stand frame 12. To unlock the wheel seats 30 and 34 when the pusher frame 14 is in the first position, the caregiver can pull the cable assembly 236 by actuating the operating part 224 to disengage the wheel seat latch 40 from the wheel seat 30, without requiring the operation of the actuator 226. The pulling action applied by the cable assembly 236 also moves the wheel seat latch 112 further away from the wheel seat 34, allowing the wheel seat latch 112 to remain disengaged from the wheel seat 34. Therefore, in the first position of the pusher frame 14, all wheel seats 30 and 34 can be unlocked simultaneously.

[0185] When the pusher frame 14 is in the second position and the operating part 224 is released, the wheel seat latch 112 engages with the wheel seat 34, locking the wheel seat 34 to the stand frame 12. Meanwhile, the wheel seat latch 40 remains disengaged from the wheel seat 30 at an initial distance, thus unlocking the wheel seat 30 and allowing it to pivot freely relative to the stand frame 12. To unlock the wheel seats 30 and 34 when the pusher frame 14 is in the second position, the caregiver can pull the cable assembly 236 by actuating the operating part 224, causing the wheel seat latch 112 to disengage from the wheel seat 34 without requiring the operation of the actuator 226. The pulling action applied via the cable assembly 236 also moves the wheel seat latch 40 further away from the wheel seat 30, maintaining the disengagement of the wheel seat latch 40 from the wheel seat 30. Therefore, in the first position of the pusher frame 14, all wheel seats 30 and 34 can be unlocked simultaneously.

[0186] Figures 40-45 A schematic diagram of another embodiment of a wheeled support device 300 for a stroller is shown. (Refer to...) Figures 40-45 The wheeled load-bearing device 300 may have a support structure 102, wheel assemblies 16 and 18, and locking assemblies 39 and 110, as previously referenced. Figure 22-24 The device may also include an actuation component 320 and an unlocking mechanism 322, which may replace the actuation component and unlocking mechanism in the aforementioned embodiments.

[0187] Reference Figures 40-45The actuation assembly 320 may include a connecting actuator 326 and a connecting member 328 coupling wheel seat latches 40, 112 to the connecting actuator 326, the wheel seat latches 40, 112 corresponding to wheel assemblies 16, 18 located on the same side (i.e., left or right) of the wheeled support 300, respectively. The connecting actuator 326 is positioned adjacent to the pusher frame 14 and is pivotable about a pivot axis R relative to the stand frame 12 and the linkage mechanism 28. According to one structural example, the connecting actuator 326 may be pivotally connected to the stand frame 12 or the linkage mechanism 28 via the pivot axis R. For example, the link 28A of the linkage mechanism 28 may have a cavity 330 in which the connecting actuator 326 is pivotally mounted and can pivot as a single component about the pivot axis R. Suitable structures for connecting actuator 326 may include, but are not limited to, turntables, levers, etc.

[0188] As previously mentioned, the pusher frame 14 can be tilted about the pivot axis R relative to the standing frame 12 and the linkage mechanism 28 in a first position toward the side of the leg frame 20 (e.g., Figure 40 The pusher 14 can pivot between a first position and a second position tilted toward the side of the support 22. A coupling 332 may be provided on the pusher 14 such that pivoting of the pusher 14 between the first and second positions causes the coupling 332 supported by the pusher 14 to contact and cause the connecting actuator 326 to pivot with the pusher 14. According to one structural embodiment, the coupling 332 may include a pin and be slidably engaged with a side portion 14A of the pusher 14. The coupling 332 can slide relative to the pusher 14 along the longitudinal axis of the side portion 14A. The connecting actuator 326 may have a groove 334 defined between two sidewalls 334A, 334B, and the coupling 332 can slidably contact either of the two sidewalls 334A, 334B. According to one structural example, a spring 336 can be provided to bias the coupling member 332 toward the interior of the recess 334, wherein the two ends of the spring 336 can be connected to the coupling member 332 and the side 14A of the pusher bracket 14, respectively. The biasing force of the spring 336 can help the coupling member 332 maintain contact with the connecting actuator 326.

[0189] Reference Figures 40-45 The connecting member 328 may surround the wheel seat latch 40 of the leg 20, and the two ends 328A and 328B of the connecting member 328 may be anchored to the connecting actuator 326 and the wheel seat latch 112 of the leg 22, respectively. According to one structural example, the connecting member 328 may include a continuous cable having a middle portion 328C surrounding the wheel seat latch 40, extending along the side section 20A of the leg 20 and the side section 22A of the leg 22, and having two ends 328A and 328B respectively anchored to the connecting actuator 326 and the wheel seat latch 112 of the leg 22. Figure 44The middle portion 328C of the connecting member 328 is shown surrounding the shaft 338 to which the wheel seat latch 40 is connected. Accordingly, the connecting member 328 can slide in contact with the wheel seat latch 40.

[0190] Reference Figure 44 and Figure 45 The locking spring 42, connected to the wheel seat latch 40, is configured to apply a biasing force to engage the wheel seat latch 40 with the wheel seat 30. The biasing force of the locking spring 42 is greater than the biasing force applied by the locking spring 114 to the wheel seat latch 112 to engage the wheel seat latch 112 with the wheel seat 34. Therefore, two different tensions can be applied to the end 328B and the middle portion 328C of the connecting member 328. This causes the connecting actuator 326 to pivotally bias the sidewall 334A of the groove 334 in the direction of displacement of the coupling member 332.

[0191] With the aforementioned structure, when the pusher frame 14 pivots between a first position tilted towards the side of the footrest 20 and a second position tilted towards the side of the footrest 22, the connecting actuator 326 can pivot synchronously with the pusher frame 14 to switch the locking state between the wheel seats 30 and 34. For example, when the pusher frame 14 pivots from the second position to the first position, the connecting actuator 326 can pivot synchronously with the pusher frame 14 in the first direction by the biasing force of the locking spring 42, thereby pulling the end 328B of the connecting member 328 and causing the wheel seat latch 112 to disengage from the wheel seat 34, and at the same time relaxing the middle part 328C of the connecting member 328 so that the wheel seat latch 40 can engage with the wheel seat 30. The pivotal displacement of the connecting actuator 326 in the first direction can be stopped when the protruding rib 340 provided on the connecting actuator 326 comes into contact with the stop protrusion 342 provided in the cavity 330, which corresponds to the first position of the pusher frame 14. When the pusher frame 14 is in the first position, the wheel seat 30 can be locked with the stand frame 12, and the wheel seat 34 is unlocked and can pivot freely relative to the stand frame 12.

[0192] Conversely, when the pusher frame 14 pivots from the first position to the second position, the coupling member 332 supported by the pusher frame 14 can contact the side wall 334A of the groove 334 and cause the connecting actuator 326 to pivot synchronously with the pusher frame 14 in a second direction opposite to the first direction, resisting the biasing force of the locking spring 42. The pivoting displacement of the connecting actuator 326 in the second direction can pull the middle part 328C of the connecting member 328 and cause the wheel seat latch 40 to disengage from the wheel seat 30, and at the same time relax the end 328B of the connecting member 328 so that the wheel seat latch 112 can engage with the wheel seat 34 by the biasing force of the locking spring 114. When the pusher frame 14 is in the second position, the wheel seat 34 can therefore be locked with the stand frame 12, and the wheel seat 30 is unlocked and can pivot freely relative to the stand frame 12.

[0193] Reference Figure 40 and Figure 42 The unlocking mechanism 322 may include an operating part 324 disposed on the grip portion 14B of the pusher frame 14, the structure of which may be similar to the aforementioned operating part 124. When the pusher frame 14 is in either the first position or the second position, the unlocking mechanism 322 can also be operated to unlock the wheel seats 30 and 34 simultaneously. According to a structural example, the operating part 324 may be connected to the connecting actuator 326 via a cable 344. Therefore, when the pusher frame 14 is in either the first position or the second position, the operating part 324 can be operated to pull the cable 344 to pivot the connecting actuator 326 in either the first direction or the second direction to unlock the wheel seats 30 and 34 simultaneously. During the pivoting of the connecting actuator 326 due to the operation of the operating part 324, the coupling member 332 may slide into contact with the sidewall 334B of the groove 334 in the connecting actuator 326. For example, when the pusher arm 14 is in the first position, operation of the operating unit 324 causes the connecting actuator 326 to pivot in the second direction and pull the connecting member 328, thereby causing the wheel seat latch 40 to move and disengage from the wheel seat 30. The pivoting displacement of the connecting actuator 326 caused by the operation of the operating unit 324 is limited and less than the pivoting displacement of the connecting actuator 326 when the pusher arm 14 switches from the first position to the second position, so the wheel seat latch 112 and the wheel seat 34 can remain disengaged. Accordingly, when the pusher arm 14 is in the first position, all wheel seats 30 and 34 can be unlocked simultaneously.

[0194] When the pusher arm 14 is in the second position, operation of the operating unit 324 can similarly cause the connecting actuator 326 to pivot in the second direction and pull the connecting member 328, causing the connecting member 328 to slide through the wheel seat latch 40, which is disengaged from the wheel seat 30. This allows the connecting member 328 to pull the wheel seat latch 112, disengaging the wheel seat latch 112 from the wheel seat 34. Therefore, when the pusher arm 14 is in the second position, all wheel seats 30 and 34 can be unlocked simultaneously.

[0195] According to a modified structure, the actuation component 320 may include the aforementioned reference. Figures 37-39The cable assembly 236, instead of coupling the operating part 324 to the connecting actuator 326 via the cable 344, is configured to couple the operating part 324 to the wheel seat latches 40 and 112, while operatively not coupling the connecting actuator 326. For example, the cable 244 of the cable assembly 236 can be connected to the slider 238 and the operating part 324 respectively; the cable portion 240 can be connected to a first portion extending along the side section 20A of the leg 20 in the wheel seat latch 40 or the connecting part 328; and the cable portion 242 can be connected to a second portion extending along the side section 22A of the leg 22 in the wheel seat latch 112 or the connecting part 328, wherein the first and second portions are folded relative to each other. According to this modified structure, when the pusher frame 14 is in either the first or the second position, the operating part 324 can also be operated to pull the cable assembly 236, thereby enabling the wheel seat latches 40 and 112 to be pulled independently of the connecting actuator 326, so that the wheel seat latches 40 and 112 are disengaged from the wheel seats 30 and 34 and unlocked.

[0196] Since the wheeled load-bearing device 300 has two wheel assemblies 16 and 18 on the left and right sides respectively, the actuation assembly 320 can be symmetrically arranged on the left and right sides and is also coupled to the operation unit 324.

[0197] Figures 46-49 A schematic diagram of another embodiment of a wheeled support device 400 for a stroller is shown. (Refer to...) Figures 46-49 The wheeled load-bearing device 400 may have a support structure 102, wheel assemblies 16 and 18, and locking assemblies 39 and 110, as previously referenced. Figure 22-24 The device may also include an actuation component 420 and an unlocking mechanism 422, which may replace the actuation component and unlocking mechanism in the aforementioned embodiments.

[0198] Reference Figures 46-49The actuation assembly 420 may include a connecting actuator 426 movably connected to the stand 12, a connecting member 428 coupling the wheel seat latch 40 to the connecting actuator 426, a connecting member 430 coupling the wheel seat latch 112 to the connecting actuator 426, and a spring 432. The wheel seat latches 40 and 112 correspond to the wheel assemblies 16 and 18 on the same side (i.e., the left or right side) of the wheel-type load-bearing device 400, respectively. The connecting actuator 426 is movable in a first direction to pull the connecting member 430 and disengage the wheel seat latch 112 from the wheel seat 34, while simultaneously releasing the connecting member 428 to engage the wheel seat latch 40 with the wheel seat 30; and the connecting actuator 426 is movable in a second direction opposite to the first direction to pull the connecting member 428 and disengage the wheel seat latch 40 from the wheel seat 30, while simultaneously releasing the connecting member 430 to engage the wheel seat latch 112 with the wheel seat 34; the connecting actuator 426 is movable in either the first or second direction in response to pivoting of the pusher frame 14 relative to the stand frame 12 between a first position and a second position with different tilt angles. According to one structural embodiment, the connecting actuator 426 is slidable with the stand frame 12 and can be a single component sliding relative to the stand frame 12 in both the first and second directions. For example, the support rod 104 may have a guide groove 434, and the connecting actuator 426 may be guided to slide along the guide groove 434. In addition, the connecting actuator 426 may be exposed and protrude from the support rod 104 to interact with the pusher frame 14.

[0199] Reference Figure 47The two connecting members 428 and 430 may comprise cable portions defined by separate cables or by a single cable, and may be arranged along the support frame 12. According to one structural example, the two connecting members 428 and 430 may be constituted by a single continuous cable. The cable may surround the guide member 436 connected to the support rod 10, may extend along the guide groove 434, and may be fixed to the connecting actuator 426. The two connecting members 428 and 430 defined by the cable may extend on both sides of the guide member 436. For example, the connecting member 428 may extend from the support rod 104 along the side connecting rod 24 and the side section 20A of the leg 20, and one end 428A of the connecting member 428 may be anchored to the wheel seat latch 40. The connecting member 430 may extend, for example, from the support rod 104 along the side section 22A of the side connecting rod 24 and the leg 22, and one end 430A of the connecting member 430 may be anchored to the wheel seat latch 112. The connecting members 428 and 430 may extend substantially parallel to each other along the support rod 104. In this manner, the connecting actuator 426 can slide along the guide groove 434 relative to the stand 12 in a first direction to pull the connecting member 430 and cause the wheel seat latch 112 to disengage from the wheel seat 34 and unlock, while simultaneously releasing the connecting member 428 so that the wheel seat latch 40 can engage with the wheel seat 30 and lock; and the connecting actuator 426 can slide along the guide groove 434 relative to the stand 12 in a second direction opposite to the first direction to pull the connecting member 428 and cause the wheel seat latch 40 to disengage from the wheel seat 30 and unlock, while simultaneously releasing the connecting member 430 so that the wheel seat latch 112 can engage with the wheel seat 34 and lock.

[0200] Spring 432 can be connected to connecting actuator 426 and can apply a biasing force to connecting actuator 426 to cause connecting actuator 426 to slide in a second direction. According to one structural example, the two ends of spring 432 can be connected to connecting actuator 426 and anchoring structure provided on carrier rod 104, respectively.

[0201] As described above, the pusher 14 of the wheeled support device 400 can pivot about a pivot axis R relative to the stand 12 and the linkage 28 between a first position tilted towards the side of the leg 20 and a second position tilted towards the side of the leg 22. When the pusher 14 pivots from the second position to the first position, the side portion 14A of the pusher 14 contacts and causes the connecting actuator 426 to move in a first direction against the biasing force of the spring 432. For example, the side portion 14A of the pusher 14 may be provided with a protrusion (not shown) that contacts and causes the connecting actuator 426 to move in the first direction when the pusher 14 pivots to the first position. When the pusher 14 is in the first position, the wheel seat 30 can be locked to the stand 12, and the wheel seat 34 is unlocked and can rotate freely relative to the stand 12.

[0202] Conversely, when the pusher frame 14 pivots from the first position to the second position, the side portion 14A of the pusher frame 14 can be moved away without contacting the connecting actuator 426, allowing the connecting actuator 426 to move in the second direction by the biasing force of the spring 432. When the pusher frame 14 is in the second position, the wheel seat 34 can be locked to the stand frame 12, while the wheel seat 30 is unlocked and can pivot freely relative to the stand frame 12.

[0203] Reference Figure 46 The unlocking mechanism 422 may include an operating part 424 disposed on the grip portion 14B of the pusher arm 14, the structure of which may be similar to the aforementioned operating part 124. When the pusher arm 14 is in either the first or second position, the unlocking mechanism 422 can also be operated to simultaneously unlock the wheel seats 30 and 34. For this purpose, the actuation assembly 420 may also include, as previously described... Figures 37-39 The cable assembly 236, for clarity, is Figure 46 and Figure 47 Not shown in the diagram. The cable assembly 236 used in the wheeled load-bearing device 400 can be configured to couple the operating part 424 to the wheel seat latches 40, 112, while simultaneously being operatively uncoupled from the actuator 426. For example, the cable 244 of the cable assembly 236 can be connected to the slider 238 and the operating part 424 respectively, the cable portion 240 can be connected to the wheel seat latch 40 or the connecting member 428, and the cable portion 242 can be connected to the wheel seat latch 112 or the connecting member 430. Accordingly, when the pusher frame 14 is in either the first or second position, the operating part 424 can also be operated to pull the cable assembly 236, thereby independently pulling the wheel seat latches 40, 112 from the wheel seats 30, 34 to disengage and unlock them.

[0204] Since the wheeled load-bearing device 400 has two wheel assemblies 16 and 18 on the left and right sides respectively, the actuation assembly 420 can be symmetrically arranged on the left and right sides and is also coupled to the operation part 424.

[0205] According to a variation, the actuation assembly provided in the wheeled load-bearing device 400 may include a connecting actuator disposed adjacent to the pusher frame 14 or the stand frame 12, and a connecting member having a central portion surrounding the connecting actuator and first and second ends anchored to the wheel seat latch 40 and wheel seat latch 112, respectively. The connecting actuator may pivot synchronously with the pusher frame 14 or the stand frame 12 in a first direction to actuate the second end of the connecting member, particularly by pushing or pulling the second end of the connecting member, and promoting… The wheel seat latch 112 disengages from the second wheel seat 34 and simultaneously releases the middle portion of the connecting member, allowing the wheel seat latch 40 to engage with the first wheel seat 30. The connecting actuator can pivot synchronously with the pusher arm 14 in a second direction opposite to the first direction to actuate the middle portion of the connecting member, particularly by pushing or pulling the middle portion, causing the wheel seat latch 40 to disengage from the wheel seat 30 and simultaneously releasing the second end of the connecting member, allowing the wheel seat latch 112 to engage with the wheel seat 34. In this variant embodiment, the actuation assembly may further include a cable assembly (e.g., [missing information]) that couples the operating part 424 to the wheel seat latches 40 and 112 but is operatively uncoupled from the connecting actuator. Figures 37-39 The cable assembly 236 shown has an operating part 424 that can be operated to actuate the cable assembly, particularly by pushing or pulling it, causing the wheel seat latches 40 and 112 to disengage from the wheel seats 30 and 34, respectively. In this variant embodiment, the cable assembly may be similar to the one described above. Figures 37-39 The cable assembly 236 includes a slider, a first cable portion and a second cable portion connected to the slider, and a third cable connected to the slider and the operating part 424. The first cable portion is also connected to the wheel seat latch 40 or the first part of the connecting member, and the second cable portion is also connected to the wheel seat latch 112 or the second part of the connecting member. The first part and the second part of the connecting member are folded relative to each other.

[0206] Figures 50-61 A schematic diagram of another embodiment of a wheeled support device 500 for a stroller is shown. (Refer to...) Figures 50-61The wheeled support device 500 may include a support structure 502, which includes a standing frame 512 and a pusher frame 514 coupled to each other, and a plurality of wheel assemblies 516, 518 disposed at the bottom of the standing frame 512. The standing frame 512 may include two legs 520, 522 pivotally connected to each other. Each of the legs 520, 522 may respectively include two side sections symmetrically disposed on the left and right sides of the standing frame 512, such as the two side sections 520A of the leg 520 and the two side sections 522A of the leg 522, and a horizontal section fixed to the two side sections, such as the horizontal section 520B of the leg 520 fixed to the two side sections 520A, and the horizontal section 522B of the leg 522 fixed to the two side sections 522A. On each of the left and right sides, the side section 520A of the leg 520 and the side section 522A of the leg 522 can be pivotally connected to each other, so that the legs 520 and 522 can pivot relative to each other about the pivot axis P when the wheeled load-bearing device 500 is folded and unfolded.

[0207] The pusher frame 514 can be pivotally coupled to the stand frame 512 via a pivot axis P. Specifically, the pusher frame 514 may include two sides 514A symmetrically arranged on the left and right sides, and a gripping portion 514B connecting the two sides 514A. On each of the left and right sides, the side 514A of the pusher frame 514 can be pivotally coupled to the stand frame 512. For example, on each of the left and right sides, the stand frame 512 may include a coupling member 524, and the pusher frame 514 may include a coupling member 526 pivotally coupled to the coupling member 524 via the pivot axis P. The coupling member 524 may be, for example, a shell fixed to a side segment 520A of the leg 520 or a side segment 522A of the leg 522, while the coupling member 526 may be, for example, a housing fixed to a side segment 514A of the pusher frame 514. With this structure, the pusher frame 514 can pivot about the pivot axis P relative to the standing frame 512 between a first position tilted to the side toward the leg 520 and a second position tilted to the side toward the leg 522.

[0208] Reference Figure 50 and Figure 51Two wheel assemblies 516 may be disposed at the lower end of the side section 520A of the tripod 520, and two wheel assemblies 518 may be disposed at the lower ends of the two side sections 522A of the tripod 522, respectively. Each wheel assembly 516 may include a wheel seat 530 pivotally connected to the tripod 520 and mounting at least one wheel 532, and the wheel 532 may pivot relative to the wheel seat 530 about a generally horizontally extending wheel axis 532A, thereby allowing the wheel seat 530 to pivot relative to the stand 512 and change the horizontal direction of the wheel axis 532A. Similarly, each wheel assembly 518 may include a wheel seat 534 pivotally connected to the tripod 522 and mounting at least one wheel 536, and the wheel 536 may pivot relative to the wheel seat 534 about a generally horizontally extending wheel axis 536A, thereby allowing the wheel seat 534 to pivot relative to the stand 512 and change the horizontal direction of the wheel axis 536A. Wheel seats 530 and 534 are spaced apart along the longitudinal axis of the wheel bearing device 500, extending from its rear to its front.

[0209] Reference Figures 50-52 The two wheel assemblies 516 may have the same structure. In each wheel assembly 516, the wheel seat 530 may be pivotally connected to the side section 520A of the stand 520 by a pivot 538, so that the wheel seat 530 and the wheel 532 mounted therein may pivot synchronously about the pivot 538. In addition, a locking assembly 539 may be provided to pivotally lock and unlock the wheel seat 530 relative to the stand 512. The locking assembly 539 may include a wheel seat latch 540 and a locking spring 542, the wheel seat latch 540 being movably connected to the stand 512, and the locking spring 542 being connected to the wheel seat latch 540. The wheel seat latch 540 is movable downward to engage with the wheel seat 530, thereby pivotally locking the wheel seat 530 to the stand 512; and the wheel seat latch 540 is movable upward to disengage from and unlock the wheel seat 530, thereby allowing the wheel seat 530 to pivot relative to the stand 512. The locking spring 542 can apply a biasing force to engage the wheel seat latch 540 with the wheel seat 530.

[0210] Reference Figure 50 , 5153. The two wheel assemblies 518 may have the same structure. In each wheel assembly 518, the wheel seat 534 may be pivotally connected to the side section 522A of the stand 522 by a pivot 544, so that the wheel seat 534 and the wheel 536 mounted therein may pivot synchronously about the pivot 544. In addition, the locking assembly 546 may be configured to pivotally lock and unlock the wheel seat 534 relative to the stand 512. The locking assembly 546 may include a wheel seat latch 548 and a locking spring 550, the wheel seat latch 548 being movably connected to the stand 512, and the locking spring 550 being connected to the wheel seat latch 548. The wheel seat latch 548 is movable downward to engage with the wheel seat 534, thereby pivotally locking the wheel seat 534 to the stand 512; and the wheel seat latch 548 is movable upward to disengage from and unlock the wheel seat 534, thereby allowing the wheel seat 534 to pivot relative to the stand 512. The locking spring 550 can apply a biasing force to engage the wheel seat latch 548 with the wheel seat 534.

[0211] Reference Figures 50-61 The wheeled load-bearing device 500 may also include an actuation component 552 and an unlocking mechanism 554. The actuation component 552 is coupled to wheel seat latches 540 and 548, and the unlocking mechanism 554 includes an operating part 556, which is disposed on the pusher frame 514.

[0212] Reference Figures 52-55 The actuation assembly 552 may include a connecting actuator 558 movably connected to the stand 512, a connecting member 560 coupling the wheel seat latch 540 to the connecting actuator 558, and a connecting member 562 coupling the wheel seat latch 548 to the connecting actuator 558. The wheel seat latches 540 and 548 correspond to the wheel assemblies 516 and 518 located on the same side (i.e., the left or right side) of the wheel-type load-bearing device 500, respectively.

[0213] The connecting actuator 558 is configured to move in a first direction to pull the connecting member 562 and disengage the wheel seat latch 548 from the wheel seat 534, while simultaneously releasing the connecting member 560 to engage the wheel seat latch 540 with the wheel seat 530; and to move in a second direction opposite to the first direction to pull the connecting member 560 and disengage the wheel seat latch 540 from the wheel seat 530, while simultaneously releasing the connecting member 562 to engage the wheel seat latch 548 with the wheel seat 534; the connecting actuator 558 is movable in either the first or second direction in response to pivoting of the pusher frame 514 relative to the stand frame 512 between a first position and a second position with different tilt angles. According to one structural embodiment, the connecting actuator 558 may be pivotally connected to the stand frame 512 via a pivot axis P, and may be a single component pivoting relative to the stand frame 512 in both the first and second directions. For example, the connecting actuator 558 can be pivotally connected to a cylinder 563 within a cavity defined between couplings 524 and 526, the cylinder 563 being fixedly connected to coupling 524. Suitable structures for the connecting actuator 558 may include, but are not limited to, a turntable, a ring, etc.

[0214] Reference Figures 52-54 The two connectors 560 and 562 may include cable portions and may be configured along the stand 512. According to one structural example, the two connectors 560 and 562 may each include two cable portions, which are two separate cables and respectively couple wheel seat latches 540 and 548 to the connecting actuator 558. For example, connector 560 may include a cable anchored at one end 560A to wheel seat latch 540 and at the other end 560B to connecting actuator 558, while connector 562 may include a cable anchored at one end 562A to wheel seat latch 548 and at the other end 562B to connecting actuator 558. The path of connector 560 may, for example, extend from wheel seat latch 540 along the side section 520A of the stand 520 to connecting actuator 558. The path of the connecting member 562 may extend, for example, from the wheel seat latch 548 along the side section 522A of the leg 522 to the connecting actuator 558. In this way, the connecting actuator 558 can pivot in a first direction to pull the connecting member 562 and cause the wheel seat latch 548 to disengage from the wheel seat 534 and unlock, while simultaneously releasing the connecting member 560 so that the wheel seat latch 540 can engage with the wheel seat 530 and lock; and can pivot in a second direction opposite to the first direction to pull the connecting member 560 and cause the wheel seat latch 540 to disengage from the wheel seat 530 and unlock, while simultaneously releasing the connecting member 562 so that the wheel seat latch 548 can engage with the wheel seat 534 and lock.

[0215] Reference Figure 52The connecting member 560 can be coupled to the tensioning mechanism in the side section 520A of the leg 520 to ensure that the connecting member 560 is properly tensioned during operation. The tensioning mechanism may include a slider 564 attached to the connecting member 560, a guide 565 fixed to the side section 520A of the leg 520, and a spring 566 connected to the slider 564 and the guide 565 respectively. The connecting member 560 can be displaced through the guide 565, while the slider 564 can be restricted to slide within the guide 565. When the connecting member 560 is pulled by the connecting actuator 558, the spring 566 is loaded by the slider 564; when the connecting actuator 558 releases the connecting member 560, the biasing force applied by the spring 566 can cause the slider 564 to slide downward to facilitate tensioning of the connecting member 560. The same tensioning mechanism can be provided for the connecting member 562, such as... Figure 53 As shown.

[0216] Reference Figures 54-59 The actuation assembly 552 may also include a pivot coupling mechanism 568, which is configured to pivotally couple the connecting actuator 558 to the pusher frame 514 during pivoting between a first position and a second position at different tilt angles; and to pivotally decouple the connecting actuator 558 from the pusher frame 514 when the pusher frame 514 is pivoting as a folding wheel-type support device 500. The pivot coupling mechanism 568 may include a guide groove 570 provided on the coupling member 524 of the stand frame 512, a catch member 572 supported by the connecting actuator 558, and a spring 574 (shown in...). Figure 59 The guide groove 570 may be formed, for example, on the column 563 of the coupling member 524 and may surround the pivot axis P. In addition, the guide groove 570 may have a slotted portion 570A and two slotted portions 570B respectively connected to the slotted portion 570A on opposite sides and inclined at an angle relative to the slotted portion 570A.

[0217] The catch member 572 can be connected to the connecting actuator 558 at an eccentric position on the pivot axis P, and can move relative to the connecting actuator 558 between a first state and a second state. The first state is in which the connecting actuator 558 is pivotally coupled to the pusher frame 514, and the second state is in which the connecting actuator 558 is pivotally decoupled from the pusher frame 514. According to one structural example, the catch member 572 can be assembled to the connecting actuator 558 to slide along the pivot axis P. Thus, the catch member 572 can slide relative to the connecting actuator 558 between the first state and the second state. In the first state, the catch member 572 engages with the coupling member 526 of the pusher frame 514, and in the second state, it disengages from the coupling member 526 of the pusher frame 514. For example, the coupling member 526 may have an opening 576, and the catch member 572 may engage with the opening 576 in a first state and disengage from the opening 576 in a second state. The spring 574 may be connected to the catch member 572 and the connecting actuator 558 respectively, and may bias the catch member 572 toward the first state.

[0218] Reference Figures 54-59 The capture member 572 may have a protrusion 578 that protrudes laterally and is received in the guide groove 570 of the coupling member 524. When the capture member 572 is in the first state and the connecting actuator 558 is pivotally coupled to the pusher frame 514, the capture member 572 engages with the coupling member 526, and the protrusion 578 is received in the slotted portion 570A. When the pusher frame 514 pivots relative to the stand frame 512 between a first position and a second position with different tilt angles, the connecting actuator 558 can pivot synchronously with the pusher frame 514. At this time, the capture member 572 is in the first state, and the protrusion 578 of the capture member 572 slides freely along the slotted portion 570A.

[0219] When the pusher arm 514 pivots beyond the range between the first and second positions as a folding wheeled support device 500, the protrusion 578 is forced to move from the slotted portion 570A into one of the two slotted portions 570B, thereby causing the catcher 572 to move to the second state and disengage from the coupling member 526. Therefore, the connecting actuator 558 can be pivotally decoupled from the pusher arm 514. This ensures that the connecting actuator 558 operates appropriately within the pivot range of the pusher arm 514 between the first and second positions at different tilt angles.

[0220] With the aforementioned structure, when the pusher frame 514 is in the first position, the wheel seat 530 can be locked to the standing frame 512, while the wheel seat 534 is unlocked and can pivot freely; when the pusher frame 514 is in the second position, the wheel seat 534 can be locked to the standing frame 512, while the wheel seat 530 is unlocked and can pivot freely.

[0221] Reference Figures 50-5460, 61, The unlocking mechanism 554 may include an operating part 556, which is disposed on the gripping part 514B of the pusher frame 514. When the pusher frame 514 is in either the first position or the second position, the unlocking mechanism 554 can be operated to simultaneously unlock the wheel seats 530, 534. For this purpose, the actuation assembly 552 may also include a cable assembly 580, which couples the operating part 556 to the wheel seat latches 540, 548 but is operatively decoupled from the actuator 558, so that the operating part 556 can be operated to pull the cable assembly 580 to simultaneously disengage the wheel seat latches 540, 548 from the wheel seats 530, 534. For example, cable assembly 580 may include cable sections 580A, 580B, and 580C. Cable section 580A is connected to wheel seat latch 540, cable section 580B is connected to wheel seat latch 548, and cable section 580C is connected to operating section 556 and cable sections 580A and 580B, respectively. Figure 60 As shown, the operating unit 556 may include a rotating drum 582 and a button 584. The rotating drum 582 may be pivotally connected to the grip portion 514B of the pusher frame 514, and one end of the cable portion 580C may be anchored to the rotating drum 582. The button 584 may be slidably connected to the grip portion 514B and pivotally connected to the rotating drum 582. With this structure, the button 584 can be pressed to cause the rotating drum 582 to pivot and pull the cable assembly 580, thereby simultaneously unlocking the wheel seat latches 540 and 548.

[0222] Since the wheeled load-bearing device 500 has two wheel assemblies 516 and 518 on the left and right sides respectively, the actuation assembly 552 can be symmetrically arranged on the left and right sides and is also coupled to the operation part 556.

[0223] Figure 62-78 A schematic diagram of another embodiment of a wheeled support device 600 for a stroller is shown. (Refer to...) Figure 62-78 The wheeled load-bearing device 600 may have a support structure 502, as described above. Figures 50-53 The wheel assemblies 516, 518 and locking assemblies 539, 546 may also include an actuation assembly 620 and an unlocking mechanism 622, which can replace the actuation assembly 552 and unlocking mechanism 554 in the aforementioned embodiments.

[0224] Reference Figure 62 and Figure 63On each of the left and right sides, side segment 520A of leg 520 can be fixed to coupling member 624, side segment 522A of leg 522 can be fixed to coupling member 626, and side segment 514A of pusher 514 can be fixed to coupling member 628. Coupling members 624, 626, and 628 can be, for example, shell components and can be pivotally connected to each other via pivot axis P, allowing pusher 514 and legs 520 and 522 to pivot relative to each other to fold and unfold the wheeled load-bearing device. Furthermore, pusher 514 can pivot about pivot axis P relative to the stand 512 between a first position tilted towards the side of leg 520 and a second position tilted towards the side of leg 522.

[0225] Reference Figures 64-69 The actuation assembly 620 may include two connecting actuators 630 and 632 movably connected to the stand 512, a connecting member 634 coupling the wheel seat latch 540 to the connecting actuator 630, a connecting member 636 coupling the wheel seat latch 548 to the connecting actuator 632, and an actuating part 638 disposed on the coupling member 628 of the pusher frame 514. The wheel seat latches 540 and 548 correspond to the wheel assemblies 516 and 518 on the same side (i.e., the left or right side) of the wheeled load-bearing device 600, respectively. According to one structural example, the connecting actuator 630 may be movably connected to the coupling member 624 of the leg 520, and the connecting actuator 632 may be movably connected to the coupling member 626 of the leg 522. For example, connecting actuators 630 and 632 can be slidably engaged with couplings 624 and 626, respectively, and are radially spaced from the pivot axis P. Therefore, connecting actuators 630 and 632 can slide relative to the stand 512 along different radial directions.

[0226] An actuating portion 638 may be disposed at an eccentric position on the coupling member 628 of the pusher frame 514 at the pivot axis P. According to one structural embodiment, the actuating portion 638 may be fixedly connected to the coupling member 628 and protrude inward. For example, the actuating portion 638 may be integrally formed with the coupling member 628. The actuating portion 638 may move synchronously with the pusher frame 514 to contact and push the connecting actuator 630 or 632 to slide radially toward the pivot axis P. The connecting actuator 630 or 632 may be propelled to move by sliding contact between the actuating portion 638 and the inclined surfaces respectively provided on the connecting actuators 630 and 632 to pull the connecting member 634 or 636. For example, the actuating portion 638 may have an inclined surface 638A suitable for pushing the connecting actuator 630 and an inclined surface 638B suitable for pushing the connecting actuator 632.

[0227] Reference Figures 64-67The two connectors 634 and 636 may include cable portions that are disposed along the stand 512. According to one structural example, the two connectors 634 and 636 may each include two cable portions, which are two separate cables that respectively couple wheel seat latch 540 to connecting actuator 630 and wheel seat latch 548 to connecting actuator 632. The path of connector 634 may, for example, extend from wheel seat latch 540 along side section 520A of stand 520 to connecting actuator 630. The path of connector 636 may, for example, extend from wheel seat latch 548 along side section 522A of stand 522 to connecting actuator 632.

[0228] Depending on the pivoting direction of the pusher arm 514, the actuating part 638 can move synchronously with the pusher arm 514 and push the connecting actuator 630 or 632 to slide, thereby pulling and unlocking the corresponding wheel seat latch 540 or 548. For example, when the pusher arm 514 pivots from the second position to the first position, the actuating part 638 can move away from the connecting actuator 630 and push the connecting actuator 632, thereby causing the connecting actuator 632 to pull the wheel seat latch 548 and disengage the wheel seat latch 548 from the wheel seat 534, and the connecting part 634 is simultaneously released so that the wheel seat latch 540 can engage with the wheel seat 530 by the biasing force of the locking spring 542. Conversely, when the pusher frame 514 pivots from the first position to the second position, the actuating part 638 moves away from the connecting actuator 632 and pushes against the connecting actuator 630. This causes the connecting actuator 630 to pull the wheel seat latch 540, disengaging the wheel seat latch 540 from the wheel seat 530. At the same time, the connecting member 636 is released, allowing the wheel seat latch 548 to engage with the wheel seat 534 through the biasing force of the locking spring 550. Therefore, when the pusher frame 514 is in the first position, the wheel seat 530 can be locked with the stand frame 512, while the wheel seat 534 is unlocked and can pivot freely. When the pusher frame 514 is in the second position, the wheel seat 534 can be locked with the stand frame 512, while the wheel seat 530 is unlocked and can pivot freely.

[0229] Reference Figure 68 , 71 -78. When the pusher arm 514 is in either the first or second position, the unlocking mechanism 622 can be operated to simultaneously unlock the wheel seats 530 and 534. According to a structural example, the unlocking mechanism 622 may include an operating part 624, two actuators 640 and 642, and an unlocking actuator 644. The operating part 624 is disposed on the gripping part 514B of the pusher arm 514, the two actuators 640 and 642 are supported by the pusher arm 514, and the unlocking actuator 644 is coupled to the operating part 624 and connected to the two actuators 640 and 642.

[0230] Two actuators 640 and 642 can be respectively housed in two cavities 646 and 648 provided in the coupling member 628 of the pusher frame 514, and are configured to move relative to the coupling member 628 toward or away from the connecting actuators 630 and 632. For example, the two actuators 640 and 642 can slide with the coupling member 628 and can slide parallel to the pivot axis P toward or away from the connecting actuators 630 and 632. Two springs 650 and 652 can be configured to bias the two actuators 640 and 642 away from the connecting actuators 630 and 632, respectively. For example, the two ends of spring 650 can be connected to the actuator 640 and the coupling member 628, respectively, and the two ends of spring 652 can be connected to the actuator 642 and the coupling member 628, respectively.

[0231] Since the actuators 640 and 642 are supported by the push frame 514, during the pivoting process of the push frame 514 between the first position and the second position with different inclination angles, the actuators 640 and 642 can move synchronously with the push frame 514 about the pivot axis P. Specifically, when the push frame 514 is in the first position, the actuator 640 can be located adjacent to the connecting actuator 630, and the actuator 642 can be displaced away from the connecting actuator 632; when the push frame 514 is in the second position, the actuator 642 can be located adjacent to the connecting actuator 632, and the actuator 640 can be displaced away from the connecting actuator 630. Accordingly, when the pusher frame 514 is in the first position, the actuator 640 is movable to push the connecting actuator 630, thereby disengaging the wheel seat latch 540 from the wheel seat 530; when the pusher frame 514 is in the second position, the actuator 642 is movable to push the connecting actuator 632, thereby disengaging the wheel seat latch 548 from the wheel seat 534. The actuators 640 and 642 may each have inclined surfaces 640A and 642A, respectively. The sliding contact between the inclined surface 640A and the connecting actuator 630 can cause the connecting actuator 630 to move to pull the connecting member 634, while the sliding contact between the inclined surface 642A and the connecting actuator 632 can cause the connecting actuator 632 to move to pull the connecting member 636.

[0232] Reference Figures 71-78The unlocking actuator 644 is supported by the pusher frame 514 and coupled to the operating part 624 via cable 654. The unlocking actuator 644 is movable to simultaneously push two actuators 640 and 642, enabling actuator 640 or 642 to push its adjacent connecting actuator 630 or 632, thereby unlocking the corresponding wheel seat latch 540 or 548. According to one structural embodiment, the unlocking actuator 644 can slide with the coupling member 628 of the pusher frame 514 and can be a single component sliding along an axis substantially orthogonal to the displacement axes of actuators 540 and 542. Actuators 640 and 642 can be moved by sliding contact between the unlocking actuator 644 and the inclined surfaces respectively provided on the actuators 640 and 642, to push the connecting actuators 630 and 632 toward the pivot axis P, respectively.

[0233] Reference Figure 62-71 The operating unit 624 may include a rotary drum 656 and a button 658. The rotary drum 656 may be pivotally connected to the grip portion 514B of the pusher frame 514, and one end of the cable 654 may be anchored to the rotary drum 656. The button 658 may be slidably connected to the grip portion 514B and pivotally connected to the rotary drum 656. With this structure, the button 658 can be pressed to cause the rotary drum 656 to pivot and pull the cable 654, thereby moving the unlocking actuator 644 and pushing the actuators 640 and 642 to move, thereby pushing the connected actuators 630 and 632.

[0234] When the pusher arm 514 is in the first position, the wheel seat 534 is kept unlocked by the interaction between the actuator 638 and the connecting actuator 632. The actuator 640 is located adjacent to the connecting actuator 630, and the actuator 642 is located away from the connecting actuator 632. When the caregiver operates the operating part 624, the unlocking actuator 644 moves and pushes the actuator 640 to move, thereby causing the connecting actuator 630 to move and pull the wheel seat latch 540, disengaging the wheel seat latch 540 from the wheel seat 530. Therefore, the wheel seats 530 and 534 can be unlocked simultaneously.

[0235] When the pusher arm 514 is in the second position, the wheel seat 530 is kept unlocked by the interaction between the actuator 638 and the connecting actuator 630. The actuator 642 is located adjacent to the connecting actuator 632, and the actuator 640 is away from the connecting actuator 630. When the caregiver operates the operating part 624, the unlocking actuator 644 moves and pushes the actuator 642 to move, thereby causing the connecting actuator 632 to move and pull the wheel seat latch 548, disengaging the wheel seat latch 548 from the wheel seat 534. Therefore, the wheel seats 530 and 534 can be unlocked simultaneously.

[0236] Since the wheeled load-bearing device 600 has two wheel assemblies 516 and 518 on the left and right sides respectively, the actuation assembly 620 and the unlocking mechanism 622 can be symmetrically arranged on the left and right sides and coupled to the operation part 624.

[0237] The advantages of the wheeled load-bearing device described herein include the ability to flexibly lock and unlock the wheel assembly relative to the support frame. Depending on the need, a portion of the wheel assembly can be locked while other portions are unlocked simultaneously, or all wheel assemblies can be unlocked simultaneously if required. Therefore, the wheeled load-bearing device offers greater flexibility and provides better mobility.

[0238] This document has illustrated how to implement a wheeled load-bearing device through specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the invention. Many variations, modifications, additions, and improvements are still possible. These and other variations, modifications, additions, and improvements fall within the scope of the invention as described in the claims.

Claims

1. A wheeled load-bearing device, comprising: Support structure, including standing frame; The first wheel seat is equipped with a first wheel and is pivotally connected to the standing frame. The first wheel is pivotable relative to the first wheel seat about the first wheel axis. The locking assembly includes a first wheel seat latch that is movably connected to the stand frame. The first wheel seat latch is engageable with the first wheel seat to pivotally lock the first wheel seat to the stand frame, and is disengaged from the first wheel seat to release the first wheel seat, thereby allowing the first wheel seat to pivot relative to the stand frame to change the direction of the first wheel axis. The actuation assembly is coupled to the first wheel seat latch. The second wheel seat is equipped with a second wheel and is pivotally connected to the standing frame. The second wheel is pivotable relative to the second wheel seat about the axis of the second wheel. The first wheel seat and the second wheel seat are spaced apart along the longitudinal axis of the wheel-type load-bearing device extending from its rear to its front. The second locking assembly includes a second wheel seat latch that is movably connected to the stand frame. The second wheel seat latch can engage with the second wheel seat to pivotally lock the second wheel seat to the stand frame, and can disengage from the second wheel seat to release the second wheel seat, thereby allowing the second wheel seat to pivot relative to the stand frame and change the direction of the second wheel axis. and The unlocking mechanism includes an operating part disposed on the bracket structure remotely from the first wheel seat latch. The unlocking mechanism is operable to cause the actuating component to actuate the first wheel seat latch, thereby disengaging the first wheel seat latch from the first wheel seat. In the first configuration, the first wheel seat is locked relative to the stand, while the second wheel seat is unlocked relative to the stand. The unlocking mechanism can be operated to cause the actuation component to actuate the first wheel seat latch so that the first wheel seat and the second wheel seat are simultaneously in the unlocked state, allowing the wheeled load-bearing device to be operated more flexibly.

2. The wheeled load-bearing device as described in claim 1, wherein, The actuation assembly includes a connecting actuator and a connecting member, the connecting actuator being movably connected to the support structure, the connecting member coupling the first wheel seat latch to the connecting actuator, wherein, in the first configuration, the unlocking mechanism is operated to cause the connecting actuator to move relative to the support structure, thereby pulling the first wheel seat latch via the connecting member to disengage the first wheel seat latch from the first wheel seat.

3. The wheeled load-bearing device as described in claim 2, wherein, Two first wheel seats, two first wheel seat latches, and two connecting members are provided. The two first wheel seats are respectively equipped with the first wheels and pivotally connected to the stand frame. The two connecting members respectively couple the two first wheel seat latches to the connecting actuator. In the first configuration, the unlocking mechanism is operated to cause the connecting actuator to move relative to the support structure, thereby pulling the two first wheel seat latches through the two connecting members to disengage the two first wheel seat latches from the two first wheel seats, so that the two first wheel seats and the second wheel seat are simultaneously in the unlocked state.

4. The wheeled load-bearing device as described in claim 1, wherein, The locking assembly includes a locking spring connected to the first wheel seat latch, the locking spring being capable of applying a biasing force to engage the first wheel seat latch with the first wheel seat.

5. The wheeled load-bearing device as described in claim 1, wherein, The support structure also includes a pusher frame coupled to the standing frame, and the operating part is disposed on the pusher frame.

6. The wheeled load-bearing device as described in claim 5, wherein, The operating part is slidably or pivotally connected to the support structure.

7. The wheeled load-bearing device as described in claim 2, wherein, The connecting element includes a cable.

8. The wheeled load-bearing device as described in claim 7, wherein, The operating unit is coupled to the connecting actuator via a cable.

9. The wheeled load-bearing device as claimed in claim 1, wherein, The actuation assembly includes a connecting actuator, and the support structure also includes a pusher frame coupled to the standing frame via a linkage mechanism, wherein the connecting actuator is movably connected to the linkage mechanism.

10. The wheeled load-bearing device as claimed in claim 9, wherein, The linkage mechanism includes a rod body, the two ends of which are pivotally connected to the pusher frame and the standing frame, respectively, and the connecting actuator is slidably connected to the rod body.

11. The wheeled load-bearing device as described in claim 9 or 10, wherein, The operating unit is located on the pusher frame.

12. The wheeled load-bearing device as claimed in claim 1, wherein, The actuation assembly includes a connecting actuator that is slidably connected to the support structure, and the operating part has an inclined surface. The unlocking mechanism is operable to release the first wheel seat latch by sliding contact between the inclined surface and the connecting actuator.

13. The wheeled load-bearing device as claimed in claim 12, wherein, The operating part includes a rotating drum pivotally connected to the support structure, and the actuation assembly includes a connecting member having a cable having one end anchored to the rotating drum. The rotating drum is pivotable to at least partially wind up the cable, thereby actuating the first wheel seat latch by the actuation assembly and disengaging it from the first wheel seat.

14. The wheeled load-bearing device as claimed in claim 12, wherein, The operating part includes a rotating drum pivotally connected to the support structure and a button slidably connected to the support structure. The actuation assembly includes a connecting member, which includes a cable having one end anchored to the rotating drum. The button can be operated to cause the rotating drum to pivot and operate the cable, thereby actuating the first wheel seat latch by the actuation assembly.

15. The wheeled load-bearing device as claimed in claim 14, wherein, The standing frame includes a footrest, and the operating part is disposed on the footrest.

16. The wheeled load-bearing device as claimed in claim 15, wherein, The tripod includes a side section and a cross section that are fixedly connected, and the operating part is disposed on the side section or the cross section.

17. The wheeled load-bearing device as claimed in claim 5, wherein, The actuation assembly includes a single cable, the opposite ends of which are connected to the operating part and the first wheel seat latch, respectively.

18. The wheeled load-bearing device as claimed in claim 17, wherein, The pusher frame is pivotable relative to the stand between a first position and a second position, and the unlocking mechanism is configured to operate in either the first position or the second position to simultaneously unlock the first wheel seat and the second wheel seat.

19. The wheeled load-bearing device as claimed in claim 17, wherein, The actuation component includes: The connecting actuator is movably connected to the support structure; and A first connecting member and a second connecting member, wherein the first connecting member couples the first wheel seat latch to the connecting actuator, and the second connecting member couples the second wheel seat latch to the connecting actuator; The connecting actuator can move in a first direction to actuate the second connecting member, thereby causing the second wheel seat latch to disengage from the second wheel seat while simultaneously releasing the first connecting member, thus allowing the first wheel seat latch to engage with the first wheel seat. Furthermore, the connecting actuator can move in a second direction opposite to the first direction to actuate the first connecting member, thereby causing the first wheel seat latch to disengage from the first wheel seat while simultaneously releasing the second connecting member, thus allowing the second wheel seat latch to engage with the second wheel seat.

20. The wheeled load-bearing device as claimed in claim 19, wherein, The connecting actuator can move in a first direction or a second direction in response to the pivoting of the pusher between a first position and a second position.

21. The wheeled load-bearing device as claimed in claim 20, wherein, Either the first connector or the second connector includes a cable.

22. The wheeled load-bearing device as claimed in claim 19, wherein, The pusher frame is pivotable relative to the stand frame about a pivot axis between a first position and a second position, and the connecting actuator is pivotally connected to the stand frame by the same pivot axis.

23. The wheeled load-bearing device as claimed in claim 19, wherein, The unlocking mechanism further includes a coupling member connected to the operating part. The coupling member can move relative to the connecting actuator between a first state and a second state. When the coupling member is in the second state and the pusher frame is in the first position, the connecting actuator can pivot relative to the pusher frame or the standing frame in a first direction, causing the second wheel seat latch to disengage from the second wheel seat.

24. The wheeled load-bearing device as claimed in claim 23, wherein, When the coupling member is in the second state and the pusher is in the second position, the connecting actuator can pivot relative to the pusher or the standing frame in a second direction, and in the second direction cause the first wheel seat latch to disengage from the first wheel seat.

25. The wheeled load-bearing device as claimed in claim 23, wherein, The coupling member is supported by the pusher frame and is movable relative to the pusher frame, wherein the connecting actuator is coupled to the pusher frame so that the connecting actuator and the pusher frame can pivot synchronously when the coupling member is in a first state.

26. The wheeled load-bearing device as claimed in claim 23, wherein, The actuation component further includes: A first spring, connected to the connecting actuator, can bias the connecting actuator to pivot relative to the stand and the pusher frame in a first direction; and A second spring, connected to the connecting actuator, can bias the connecting actuator to pivot in a second direction relative to the stand and the pusher.

27. The wheeled load-bearing device as claimed in claim 26, wherein, The coupling member engages with the connecting actuator in the first state to prevent the connecting actuator from pivoting relative to the pusher frame; When the coupling member is in the second state, the connecting actuator can pivot relative to the pusher frame and the standing frame by the biasing force of the first spring or the second spring.

28. The wheeled load-bearing device as claimed in claim 26, wherein, The pusher can pivot between a first position and a second position when the coupling member is in a first state. Therefore, when the pusher pivots from the second position to the first position, the connecting actuator can pivot synchronously with the pusher in a first direction, and when the pusher pivots from the first position to the second position, the connecting actuator can pivot synchronously with the pusher in a second direction.

29. The wheeled load-bearing device as described in any one of claims 26-28, wherein, The operating unit can be operated when the pusher frame is in the first position to move the coupling member relative to the pusher frame from the first state to the second state, such that the connecting actuator biased by the second spring pivots in the second direction and pulls the first connecting member to disengage the first wheel seat latch from the first wheel seat; and the operating unit can be operated when the pusher frame is in the second position to move the coupling member relative to the pusher frame from the first state to the second state, such that the connecting actuator biased by the first spring pivots in the first direction and pulls the second connecting member to disengage the second wheel seat latch from the second wheel seat.

30. The wheeled load-bearing device as described in any one of claims 26-28, wherein, The connecting actuator has a generally V-shaped slot and a notch at the bottom of the slot. The coupling element engages with the notch in a first state and disengages from the notch in a second state.

31. The wheeled load-bearing device as described in any one of claims 26-28, wherein, The operating unit is connected to the coupling member via a cable.

32. The wheeled load-bearing device as described in any one of claims 19-28, wherein, The actuation assembly further includes a cable assembly that couples the operating part to the first wheel seat latch and the second wheel seat latch, but not to the connecting actuator. The operating part can be operated to actuate the cable assembly to disengage the first wheel seat latch and the second wheel seat latch from the first wheel seat and the second wheel seat, respectively.

33. The wheeled load-bearing device as described in claim 32, wherein, The cable assembly includes a slider, a first cable portion, a second cable portion, and a third cable. The first cable portion and the second cable portion are connected to the slider, and the third cable is connected to the slider and the operating part. The first cable portion is also connected to the first connecting member or the first wheel seat latch, and the second cable portion is also connected to the second connecting member or the second wheel seat latch.

34. The wheeled load-bearing device as claimed in claim 19, wherein, The actuation assembly further includes a pivot coupling mechanism, which is configured to pivotally couple the connecting actuator to the pusher frame during pivoting between the first and second positions; and to pivotally decouple the connecting actuator from the pusher frame when the pusher frame is pivoting to fold the wheeled load-bearing device.

35. The wheeled load-bearing device as described in claim 34, wherein, The standing frame includes a first coupling member, the pusher frame includes a second coupling member pivotally connected to the first coupling member, and the pivot coupling mechanism includes a guide groove provided on the first coupling member and a capture member supported by the connecting actuator. The capture member has a protrusion accommodated in the guide groove. The guide groove has a first slot and a second slot inclined at an angle relative to the first slot. The capture member can move relative to the connecting actuator between a first state and a second state. In a first state, the catcher engages with the second coupling member and the protrusion is received in the first slot to pivotally couple the connecting actuator to the pusher frame; in a second state, the catcher disengages from the second coupling member and the protrusion is received in the second slot to pivotally decouple the connecting actuator from the pusher frame.

36. The wheeled load-bearing device as described in claim 35, wherein, When the pusher arm pivots between the first position and the second position, the protrusion of the catcher is adapted to slide along the first slot.

37. The wheeled load-bearing device as claimed in claim 36, wherein, The pivot coupling mechanism further includes a spring connected to the catcher and the connecting actuator, respectively, and the spring biases the catcher toward a first state.

38. The wheeled load-bearing device as claimed in claim 19, wherein, The actuation assembly further includes a spring connected to the connecting actuator. When the pusher arm pivots from the second position to the first position, it contacts and causes the connecting actuator to move in the first direction. When the pusher arm pivots from the first position to the second position, it removes the connecting actuator, allowing the connecting actuator to move in the second direction by the biasing force of the spring.

39. The wheeled load-bearing device as described in any one of claims 19-28, wherein, The first connector and the second connector are both made of a single cable.

40. The wheeled load-bearing device as claimed in claim 18, wherein, The actuation component includes: Connecting actuators, disposed adjacent to the pusher frame or the standing frame; and A connecting member has a middle portion, a first end portion, and a second end portion, the middle portion surrounding a first wheel seat latch, and the first end portion and the second end portion being anchored to the connecting actuator and the second wheel seat latch, respectively. The connecting actuator can pivot synchronously with the pusher frame or the standing frame in a first direction to actuate the second end of the connecting member, causing the second wheel seat latch to disengage from the second wheel seat, and simultaneously loosening the middle portion of the connecting member to engage the first wheel seat latch with the first wheel seat; and the connecting actuator can pivot synchronously with the pusher frame in a second direction opposite to the first direction to actuate the middle portion of the connecting member, causing the first wheel seat latch to disengage from the first wheel seat, and simultaneously loosening the second end of the connecting member to engage the second wheel seat latch with the second wheel seat.

41. The wheeled load-bearing device as claimed in claim 40, wherein, The locking assembly includes a first locking spring connected to the first wheel seat latch, and the second locking assembly includes a second locking spring connected to the second wheel seat latch. The biasing force applied by the first locking spring to engage the first wheel seat latch with the first wheel seat is greater than the biasing force applied by the second locking spring to engage the second wheel seat latch with the second wheel seat.

42. The wheeled load-bearing device as claimed in claim 40 or 41, wherein, When the pusher is in either the first or the second position, the operating part can be operated to pivot the connecting actuator toward the same direction in the first and second directions, thereby unlocking the first wheel seat and the second wheel seat.

43. The wheeled load-bearing device as claimed in claim 40 or 41, wherein, The operating unit is connected via a cable to the connecting actuator or a drive unit coupled to the connecting actuator, so that the operating unit can be operated to pivot the connecting actuator.

44. The wheeled load-bearing device as claimed in claim 17, wherein, The actuation component includes: Connecting actuators, disposed adjacent to the pusher frame or the standing frame; and A connecting member has a middle portion, a first end portion, and a second end portion, the middle portion surrounding the connecting actuator, and the first end portion and the second end portion being anchored to the first wheel seat latch and the second wheel seat latch, respectively. The connecting actuator can pivot synchronously with the pusher frame or the standing frame in a first direction to actuate the second end of the connecting member, causing the second wheel seat latch to disengage from the second wheel seat, and simultaneously loosening the middle portion of the connecting member to engage the first wheel seat latch with the first wheel seat; and the connecting actuator can pivot synchronously with the pusher frame in a second direction opposite to the first direction to actuate the middle portion of the connecting member, causing the first wheel seat latch to disengage from the first wheel seat, and simultaneously loosening the second end of the connecting member to engage the second wheel seat latch with the second wheel seat.

45. The wheeled load-bearing device as claimed in claim 44, wherein, The actuation assembly further includes a cable assembly that couples the operating part to the first wheel seat latch and the second wheel seat latch, but not to the connecting actuator. The operating part can be operated to actuate the cable assembly to disengage the first wheel seat latch and the second wheel seat latch from the first wheel seat and the second wheel seat, respectively.

46. ​​The wheeled load-bearing device as claimed in claim 45, wherein, The cable assembly includes a slider, a first cable portion, a second cable portion, and a third cable. The first cable portion and the second cable portion are connected to the slider, and the third cable is connected to the slider and the operating part. The first cable portion is also connected to the first wheel seat latch or the first part of the connecting member, and the second cable portion is also connected to the second wheel seat latch or the second part of the connecting member. The first part and the second part of the connecting member are folded relative to each other.

47. The wheeled load-bearing device as claimed in claim 17, wherein, The actuation component includes: The first connecting actuator and the second connecting actuator are movably connected to the standing frame; A first connecting member and a second connecting member, the first connecting member coupling the first wheel seat latch to the first connecting actuator, and the second connecting member coupling the second wheel seat latch to the second connecting actuator; and The coupling element is fixedly connected to the pusher frame and has an actuating part; When the pusher arm pivots from the second position to the first position, the actuating part moves away from the first connecting actuator, causing the second connecting actuator to move, thereby causing the second connecting actuator to actuate the second wheel seat latch to disengage from the second wheel seat; and when the pusher arm pivots from the first position to the second position, the actuating part moves away from the second connecting actuator, causing the second connecting actuator to move, thereby causing the first connecting actuator to actuate the first wheel seat latch.

48. The wheeled load-bearing device as claimed in claim 47, wherein, The unlocking mechanism further includes a first actuator, a second actuator, and an unlocking actuator. The first actuator and the second actuator are supported by the pusher frame. The unlocking actuator is coupled to the operating part and connected to the first actuator and the second actuator. When the pusher frame is in the first position, the first actuator is adjacent to the first connecting actuator, and the second actuator is away from the second connecting actuator. When the pusher frame is in the second position, the second actuator is adjacent to the second connecting actuator, and the first actuator is away from the second connecting actuator. A first connecting actuator; when the pusher frame is in the first position, the operating unit can be operated to cause the first actuator to move the first connecting actuator, thereby causing the first connecting actuator to actuate the first wheel seat latch, thereby disengaging the first wheel seat latch from the first wheel seat; when the pusher frame is in the second position, the operating unit can be operated to cause the second actuator to move the second connecting actuator, thereby causing the second connecting actuator to actuate the second wheel seat latch, thereby disengaging the second wheel seat latch from the second wheel seat.

49. The wheeled load-bearing device as claimed in claim 1, wherein, The wheeled support device is a children's stroller.

50. The wheeled load-bearing device as claimed in claim 6, wherein, The operating part is slidably or pivotally connected to the pusher frame.

51. The wheeled load-bearing device as described in claim 40, wherein, The connecting actuator is movable to push or pull the connecting element.

52. The wheeled load-bearing device as claimed in claim 13, wherein, The first wheel seat latch is pushed or pulled by the actuation component.

53. The wheeled load-bearing device as claimed in claim 14, wherein, By pulling the cable, the first wheel seat latch is pulled by the actuation assembly and disengaged from the first wheel seat.

54. The wheeled load-bearing device as claimed in claim 19, wherein, The connecting actuator is movably connected to the stand or the pusher frame, wherein the connecting actuator can move in a first direction to push or pull the second connecting member, thereby causing the second wheel seat latch to disengage from the second wheel seat while simultaneously releasing the first connecting member, thereby allowing the first wheel seat latch to engage with the first wheel seat, and the connecting actuator can move in a second direction opposite to the first direction to push or pull the first connecting member, thereby causing the first wheel seat latch to disengage from the first wheel seat while simultaneously releasing the second connecting member, thereby allowing the second wheel seat latch to engage with the second wheel seat.

55. The wheeled load-bearing device as claimed in claim 32, wherein, The operating part can be operated to push or pull the cable assembly to disengage the first wheel seat latch and the second wheel seat latch from the first wheel seat and the second wheel seat, respectively.

56. The wheeled load-bearing device as claimed in claim 40, wherein, The connecting actuator can pivot synchronously with the pusher frame or the standing frame in a first direction to push or pull the second end of the connecting member, causing the second wheel seat latch to disengage from the second wheel seat, and simultaneously loosening the middle portion of the connecting member to engage the first wheel seat latch with the first wheel seat. The connecting actuator can also pivot synchronously with the pusher frame in a second direction opposite to the first direction to push or pull the middle portion of the connecting member, causing the first wheel seat latch to disengage from the first wheel seat, and simultaneously loosening the second end of the connecting member to engage the second wheel seat latch with the second wheel seat.

57. The wheeled load-bearing device as claimed in claim 44, wherein, The connecting actuator can pivot synchronously with the pusher frame or the standing frame in a first direction to push or pull the second end of the connecting member, causing the second wheel seat latch to disengage from the second wheel seat, and simultaneously loosening the middle portion of the connecting member to engage the first wheel seat latch with the first wheel seat; and the connecting actuator can pivot synchronously with the pusher frame in a second direction opposite to the first direction to push or pull the middle portion of the connecting member, causing the first wheel seat latch to disengage from the first wheel seat, and simultaneously loosening the second end of the connecting member to engage the second wheel seat latch with the second wheel seat.

58. The wheeled load-bearing device as claimed in claim 45, wherein, The operating part can be operated to push or pull the cable assembly to disengage the first wheel seat latch and the second wheel seat latch from the first wheel seat and the second wheel seat, respectively.

59. The wheeled load-bearing device as claimed in claim 47, wherein, When the pusher arm pivots from the second position to the first position, the actuating part moves away from the first connecting actuator and pushes or pulls the second connecting actuator, thereby causing the second connecting actuator to push or pull the second wheel seat latch, thus disengaging the second wheel seat latch from the second wheel seat; and when the pusher arm pivots from the first position to the second position, the actuating part moves away from the second connecting actuator and pushes or pulls the first connecting actuator, thereby causing the first connecting actuator to push or pull the first wheel seat latch, thus disengaging the first wheel seat latch from the first wheel seat.

60. The wheeled load-bearing device as claimed in claim 48, wherein, When the pusher is in the first position, the operating unit can be operated to push or pull the first connecting actuator, causing the first connecting actuator to push or pull the first wheel seat latch, thereby disengaging the first wheel seat latch from the first wheel seat; when the pusher is in the second position, the operating unit can be operated to push or pull the second connecting actuator, causing the second connecting actuator to push or pull the second wheel seat latch, thereby disengaging the second wheel seat latch from the second wheel seat.

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