Wheelset brake mechanism and baby carrier

Abstract

We provide a wheelset brake mechanism with a simple structure and a baby carrier equipped with it. [Solution] The wheelset brake mechanism of the present invention includes a drive member mounted on a movable frame and a brake assembly including a drive pin, a traction member and a locking member. The drive pin is operably connected to the drive member, and the traction member includes a first cable and a second cable, the first end of the first cable being connected to the drive pin, the second end of the first cable extending into the internal cavity of a hollow shaft and rotatably connected to the first end of the second cable, and the second end of the second cable being connected to the locking member. The drive member is configured to drive the drive pin to slide, and the traction member to slide the locking member to lock the wheel.

Description

Cross - reference to related applications

[0001] This application claims priority to Chinese Patent Application No. CN2020111439643, entitled "Wheel Set Brake Mechanism and Baby Carrier", filed on October 22, 2020, the entire content of which is incorporated herein by reference.

Technical Field

[0002] The present invention relates to wheel brake technology, and in particular, to a wheel set brake mechanism and a baby carrier equipped with such a mechanism.

Background Art

[0003] Generally, baby carriers are equipped with a brake mechanism. When the user presses the drive member of the brake mechanism with the foot, the brake mechanism locks the rear wheels of the baby carrier, preventing accidental movement of the baby carrier and improving the safety of using the baby carrier. In some baby carriers, the brake mechanisms of individual rear wheels are separated from each other. When applying the brake, the user needs to operate the drive members of each brake mechanism individually, and each brake mechanism locks the corresponding rear wheel respectively. Such baby carriers require more complex brake operations. In some other baby carriers, the brake mechanisms of individual rear wheels share the same drive member. The user operates the same drive member so that the brake mechanism can lock the rear wheels simultaneously. Such baby carriers simplify the brake operation but have a more complex structure.

[0004] Also, the front wheels of baby carriers are generally universal wheels, but the rear wheels can also be universal wheels so that the baby carrier can run smoothly when turning. However, when the baby carrier moves forward normally, the rear wheels rotate easily, making it difficult for the baby carrier to move forward normally.

Summary of the Invention

[0005] The object of the present invention is to provide a wheelset brake mechanism with a simple structure and a baby carrier equipped therewith.

[0006] In one embodiment, the present invention provides a wheel set brake mechanism for locking a wheel of a movable frame. The wheel is mounted to the movable frame via a hollow shaft so as to be rotatable in all directions, and the wheel set brake mechanism includes a drive member mounted to the movable frame and a brake assembly including a drive pin, a traction member, and a locking member, wherein the drive pin is operably connected to the drive member, the traction member includes a first cable and a second cable, the first end of the first cable is connected to the drive pin, the second end of the first cable extends into the inner cavity of the hollow shaft and is rotatably connected to the first end of the second cable, and the second end of the second cable is connected to the locking member. The drive member is configured to drive the drive pin to slide, and the traction member slides the locking member to lock the wheel.

[0007] Furthermore, the drive member has a sleeve portion and a pedal portion extending from the sleeve portion. The sleeve portion is sleeved into the horizontal tube of the movable frame, an elongated hole is provided in one of the horizontal tube and sleeve portion, and a chute is provided in the other of the horizontal tube and sleeve portion. The drive member has an initial position and a braking position, separated by a predetermined angle in the circumferential direction. The drive pin is sleeved into the horizontal tube, and the drive pin is provided with a sliding shaft that protrudes radially and passes through the elongated hole and chute. When switching between the initial position and the braking position, the drive member drives the sliding shaft, causing it to slide within the elongated hole and chute, thereby moving the drive pin along the axial direction of the horizontal tube, allowing the locking member to unlock or lock the wheel.

[0008] Furthermore, the wheelset brake mechanism of the present invention further comprises a first elastic member that acts on the drive pin to hold the drive member in its initial position via the drive pin.

[0009] Furthermore, the brake assembly further includes a first elastic reset member configured to act on the locking member to maintain the locking member in an unlocked position that releases the wheel.

[0010] Furthermore, the sleeve section is provided with two symmetrically arranged chutes, and the horizontal tube is provided with two elongated holes corresponding to each of the two chutes. The wheelset brake mechanism is provided with two brake assemblies, and the locking members of the two brake assemblies are configured to lock the two wheels of the movable frame, and the slide shafts of each of the two brake assemblies are sleeved with corresponding sets of chutes and elongated holes, and the first elastic member is clamped between the drive pins of the two brake assemblies.

[0011] Furthermore, the second end of the first cable has a connector, and the connector is provided with a connecting groove. The first end of the second cable is provided with a first pivot joint, and the first pivot joint is rotatably positioned within the connecting groove.

[0012] Furthermore, the movable frame is provided with a wheel seat, and the wheel is provided with a wheel stand, which is pivotally connected to the wheel seat via a vertically positioned hollow shaft. The locking member includes a traverse shaft and a longitudinal shaft positioned perpendicular to each other, a slide sleeve fixed to the longitudinal shaft, the slide sleeve slidably engages with the wheel stand, the axis of the slide sleeve is perpendicular to the rolling axis of the wheel, and an accommodating groove is provided at one end of the slide sleeve away from the traverse shaft. A second pivot joint is provided at the second end of the second cable, and the second pivot joint is rotatably positioned within the accommodating groove.

[0013] Furthermore, a first elastic reset member is positioned between the wheel stand and the slide sleeve.

[0014] Furthermore, the transverse shaft extends into the slide sleeve and is connected to the slide sleeve via a pin shaft.

[0015] Furthermore, the wheel hub is provided with multiple engagement holes along its circumference, allowing the lateral shaft to enter these holes to lock the wheel or exit them to unlock it.

[0016] Furthermore, the movable frame is provided with a wheel seat, and the wheel has a wheel stand, which is pivotally attached to the wheel stand via a vertically positioned hollow shaft. The locking member includes a transverse shaft and a longitudinal shaft arranged perpendicular to each other, the longitudinal shaft slidably engaging with the wheel stand, and the axis of the longitudinal shaft is perpendicular to the wheel's axis of rotation. The second end of the second cable is connected to the transverse shaft. The wheel hub is provided with multiple engagement holes along the circumferential direction, and the transverse shaft can enter the engagement holes to lock the wheel or exit the engagement holes to unlock the wheel.

[0017] Furthermore, the drive member includes a sleeve portion and a pedal portion extending from the sleeve portion, and the horizontal tube of the movable frame is fitted into the sleeve portion, and the drive member has an initial position and a brake position separated by a predetermined angle in the circumferential direction. The wheelset brake mechanism further includes a locking assembly configured to lock the drive member in the brake position.

[0018] Furthermore, the lock assembly includes a locking protrusion positioned on the outside of the horizontal tube. The sleeve portion is provided with an end surface that contacts the locking protrusion, and the end surface is provided with a locking recess. When the locking protrusion engages with the locking recess, the drive member is locked in the brake position.

[0019] Furthermore, the locking protrusion is composed of an elastically expandable and contractible locking pin, and the axis of the locking pin is parallel to the axial direction of the horizontal tube.

[0020] Furthermore, a wheel seat is provided at the end of the horizontal tube, and a mounting hole is provided in the wheel seat. A second elastic member and a lock pin are positioned in the mounting hole, and the end of the lock pin that engages with the lock recess is arc-shaped or frustoconical.

[0021] Furthermore, the end face is provided with a guide groove that slidably engages with the locking projection.

[0022] In another embodiment, the present invention provides a baby carrier including a movable frame and the wheelset brake mechanism described above, wherein the movable frame includes front and rear wheels, the rear wheels being rotatably mounted to the movable frame in all directions via a hollow shaft, and the wheelset brake mechanism being configured to lock the rear wheels.

[0023] Furthermore, the movable frame is equipped with a wheel seat, and the rear wheels are equipped with wheel stands, which are pivotally attached to the wheel seats so that the rear wheels can rotate in all directions. The baby carrier also includes a wheel set orienting mechanism, which is configured to lock the rotation of the wheel stands.

[0024] Furthermore, the wheel set orientation mechanism includes an operation portion, a third cable, a locating pin, and a second elastic reset member. The operation portion is connected to the first end of the third cable, the second end of the third cable is connected to the locating pin, and the axis of the locating pin is parallel to the rotation axis of the wheel stand. In addition, a locating hole is provided in the wheel stand, the second elastic reset member is configured to drive the locating pin to extend into the locating hole, and the operation portion is configured to move the locating pin from the locating hole via the third cable.

[0025] Also, the movable frame includes a pair of front wheels and a pair of rear wheels. The front wheels and the rear wheels are respectively attached to the movable frame rotatable in all directions, and the wheel set orientation mechanism is configured to lock the rotation of both wheel stands of the pair of rear wheels.

Brief Description of the Drawings

[0026] [Figure 1] FIG. 1 is a front perspective view of a baby stroller according to an embodiment of the present invention. [Figure 2] FIG. 2 is a rear perspective view of a baby stroller according to an embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of a wheel set brake mechanism, a rear wheel, and a part of a frame in a baby stroller according to an embodiment of the present invention. [Figure 4] FIG. 4 is a side view of a baby stroller according to an embodiment of the present invention. [Figure 5] FIG. 5 is a partial side cross-sectional view of a rear wheel, a wheel set brake mechanism, and a wheel set orientation mechanism in a baby stroller according to an embodiment of the present invention. [Figure 6] FIG. 6 is a partial perspective view of a rear wheel and a wheel set brake mechanism in a baby stroller according to an embodiment of the present invention, where the drive member is omitted for ease of explanation. [Figure 7]Figure 7 is a perspective view showing a part of the drive member of the wheelset brake mechanism in a baby carrier according to one embodiment of the present invention. [Figure 8] Figure 8 is a perspective view of another part of the drive member of the wheelset brake mechanism in a baby carrier according to one embodiment of the present invention. [Figure 9] Figure 9 is a partial front cross-sectional view of the rear wheel and wheelset brake mechanism in a baby carrier according to one embodiment of the present invention, where the structure of the second cable is shown. [Figure 10] Figure 10 is a partial perspective view of the rear wheel and wheelset brake mechanism in a baby carrier according to one embodiment of the present invention, where the wheel stand is omitted for ease of explanation. [Figure 11] Figure 11 is a partial cross-sectional view of the locking member of the wheelset brake mechanism in a baby carrier according to one embodiment of the present invention, when the drive member is in its initial position. [Figure 12] Figure 12 is a partial cross-sectional view of the locking member of the wheelset brake mechanism in a baby carrier according to one embodiment of the present invention, when the drive member is in the brake position. [Figure 13] Figure 13 is a partial front cross-sectional view of the rear wheel and wheelset brake mechanism in a baby carrier according to one embodiment of the present invention, where the other structure of the second cable is shown. [Figure 14] Figure 14 is a perspective view of the second cable shown in Figure 13. [Modes for carrying out the invention]

[0027] To explain in detail the technical content, structural features, and effects obtained from the present invention, the following description will be given with reference to examples and accompanying drawings.

[0028] As shown in Figures 1 and 2, for example, the baby stroller 100 according to one embodiment of the present invention is a baby stroller. The baby stroller 100 includes a movable frame 1 and a seat (not shown) attached to the movable frame 1, and the baby stroller 100 is provided with a wheelset brake mechanism according to one embodiment of the present invention. Needless to say, the type of baby stroller 100 is not limited to a baby stroller. Furthermore, the scope of application of the wheelset brake mechanism according to the embodiment of the present invention is not limited to the baby stroller 100.

[0029] The movable frame (hereinafter referred to as "frame") 1 comprises a pair of front wheels 2 and a pair of rear wheels 3. For example, the front wheels 2 may be universal swiveling wheels, and the rear wheels 3 may also be universal swiveling wheels. Specifically, the rear wheels 3 are provided with, for example, wheel stands 31, a horizontal tube 12 is positioned below the rear end of the frame 1, and wheel seats 11 are provided on both sides of the horizontal tube 12. The wheel seats 11 are pivotally attached to the wheel seats 31 of the corresponding rear wheels 3, and the wheel stands 31 drive the rear wheels 3 to rotate freely (universally). It can be understood that the rotation axis of the wheel stands 31 is perpendicular to the axis of the horizontal tube 12, and the rolling axis of the rear wheels 3 is perpendicular to the rotation axis of the wheel stands 31. When the baby carrier 100 travels in a horizontal plane, it can be understood that the rotation axis of the wheel stands 31 is approximately perpendicular to the horizontal plane, and the rolling axis of the rear wheels 3 is approximately parallel to the horizontal plane.

[0030] A wheelset brake mechanism 4 is located on the frame 1. In this embodiment, the wheelset brake mechanism 4 may simultaneously lock the two rear wheels 3 to prevent them from rolling in order to brake the baby carrier 100. The wheelset brake mechanism 4 can also simultaneously release the locks on the two rear wheels 3 to allow them to roll, enabling the baby carrier 100 to travel normally.

[0031] A wheel set orienting mechanism 5 is positioned on the frame 1. The wheel set orienting mechanism 5 may simultaneously restrict the rotation of the wheel stands 31 of the two rear wheels 3, preventing the wheel stands 31 from rotating freely around their axis of rotation. Alternatively, the wheel set orienting mechanism 5 may simultaneously release the rotation restriction on the wheel stands 31 of the two rear wheels 3, allowing the wheel stands 31 to rotate freely around their axis of rotation.

[0032] The structure of a wheelset brake mechanism 4 according to one embodiment of the present invention will be described below with reference to Figures 3 to 12. The wheelset brake mechanism 4 may include a drive member 41, a lock assembly 410 (see Figure 9), two brake assemblies, and a first elastic member 44 (see Figure 9). The brake assemblies may have substantially the same structure, for example, including a drive pin 42, a traction member (first cable and second cable), a lock member 43, and a first elastic member 44. One of these brake assemblies will be described in detail below.

[0033] Referring to Figure 3, the drive member 41 may include a sleeve portion 412 and a pedal portion 411 extending from the sleeve portion 412. The sleeve portion 412 may be positioned outside the horizontal tube 12 so as to be rotatable around the axis of the horizontal tube 12. Referring to Figures 7 and 8, in some embodiments, the sleeve portion 412 may be formed by butting together two semi-cylindrical structures 412a and 412b. Referring to Figure 7, the sleeve portion 412 may have two chutes 41a symmetrically provided. Referring to Figure 6, the horizontal tube 12 may have two elongated holes 12a. One elongated hole 12a corresponds to one chute 41a, and the direction of extension of this elongated hole 12a is parallel to the axial direction of the horizontal tube 12. In other embodiments, two chutes 41a may be positioned on the horizontal tube 12 and two elongated holes 12a may be positioned on the sleeve portion 412. The pedal portion 411 can extend from the semi-cylindrical structure 412a so that the user can push it down. In some embodiments, when the pedal portion 411 receives a downward pressure from the user, it can pivot the sleeve portion 412 downward, allowing the drive member 41 to rotate to the brake position. In this case, the rear wheel 3 is locked and cannot rotate. When the pedal portion 411 receives an upward lifting force from the user, it can pivot the sleeve portion 412 upward, allowing the drive member 41 to rotate to its initial position. In this case, the rear wheel 3 is unlocked and can rotate freely.

[0034] The lock assembly 410 is configured to lock the drive member 41 in the brake position. That is, when the drive member 41 rotates to the brake position, the lock assembly 410 can automatically lock the rotation of the drive member 41, maintaining the drive member 41 in the brake position. It will be understood that when the user applies an upward lifting force to the pedal portion 411, the locking force applied to the drive member 41 by the lock assembly 410 is overcome, and the pedal portion 411 can be returned to its initial position. A preferred structure of the lock assembly 410 is described in detail below.

[0035] Referring to Figures 6 to 9, the drive pins 42 are arranged to be axially movable within the horizontal tube 12, and the axis of the drive pins 42 is, for example, parallel to the axis of the horizontal tube 12. The drive pins 42 are provided with radially projecting sliding shafts 42a. That is, the axis of the sliding shafts 42a is perpendicular to the axis of the horizontal tube 12. The sliding shafts 42a pass through the corresponding slotted holes 12a and chutes 41a. Thus, when the drive member 41 switches between the initial position and the brake position, the drive member 41 can drive the two drive pins 42 of the two brake assemblies to slide simultaneously. Specifically, as the drive member 41 rotates, the sliding shafts 42a of the two drive pins 42 are driven into the chutes 41a, allowing them to slide toward or away from each other axially along the slotted holes 12a of the horizontal tube 12. The movement of the two sliding shafts 42a allows the two drive pins 42 to be driven toward or away from each other.

[0036] Referring to Figure 9, the drive pin 42 of each brake assembly is connected to the locking member 43 via a traction member, and the drive pin 42 and the locking member 43 can operate synchronously. The traction member may be a flexible cable such as a wire rope. For example, in some embodiments, the traction member may be a single cable. One end of the traction member is connected to the drive pin 42 and the other end is connected to the locking member 43.

[0037] Referring further to Figure 9, in this embodiment, the traction member may include a continuously connected first cable 48 and a second cable 49. More specifically, the wheel seat 11 is provided with a hollow shaft 47 extending downward from the wheel seat 11, which is positioned substantially vertically (the axis of the hollow shaft 47 is substantially perpendicular to the axis of the horizontal tube 12), and the wheel stand 31 of the rear wheel 3 is pivotally attached to the wheel seat 11 via the hollow shaft 47. The first end of the first cable 48 is connected to a drive pin 42, the second end of the first cable 48 extends into an internal cavity 470 of the hollow shaft 47 and is rotatably connected to the first end of the second cable 49, and the second end of the second cable 49 is connected to a locking member 43.

[0038] In Figure 9, the second end of the first cable 48 is provided with a connector 48a that slidably engages with, for example, a hollow shaft 47, and the connector 48a may be provided with a connecting groove 480a. The second cable 49 has a first pivot joint 49a. The first pivot joint 49a is rotatably positioned within the connecting groove 480a. For example, the first pivot joint 49a may be fixed within the connecting groove 480a by contacting the groove wall of the connecting groove 480a via a spherical surface, thereby allowing the first cable 48 and the second cable 49 to rotate relative to each other at their joint while maintaining tension. In Figure 9, the first pivot joint 49a has a spherical head, and the traction line of the second cable 49 is led out through a through-hole in the connector 48a. The first pivot joint 49a can rotate freely within the connecting groove 480a. Therefore, when the second cable 49 rotates together with the rear wheel 3, the first cable 48 and the second cable 49 will not be twisted or damaged, thus preventing any impact on the operation of the drive pin 42 and the drive member 41.

[0039] Referring to Figures 13 and 14, in some other embodiments, the first pivot joint 49a of the second cable 49 may be, for example, cylindrical, conical, or bullet-shaped. A ball 49c may be positioned at the lower end of the first pivot joint 49a. The traction line of the second cable 49 passes through the ball 49c and then is led out through a through-hole in the connector 48a. The ball 49c abuts against the groove wall of the connecting groove 480a, allowing the first pivot joint 49a to rotate freely relative to the connecting head 48a with low frictional resistance and low noise.

[0040] Referring to Figures 9 to 12, the locking member 43 locks the rear wheel 3. From the above, it can be understood that when the drive member 41 rotates to the brake position, it can drive the drive pin 42 to move along the axis of the horizontal tube 12, and the drive pin 42, via the traction member, can drive the locking member 43 to overcome the elastic force of the first elastic reset member 46 and perform the locking action, thereby moving the locking member 43 to the locked position that locks the rear wheel 3. When the drive member 41 rotates to the initial position, the locking member 43 returns to the unlocked position where the lock on the rear wheel 3 is released due to the action of the first elastic reset member 46.

[0041] Referring to Figures 10 and 11, in some embodiments the locking member 43 may have a T-shaped structure. More specifically, the locking member 43 may include a transverse shaft 431 and a longitudinal shaft 432 arranged orthogonally to each other. As can be seen from Figure 10, the hub of the rear wheel 3 is provided with a plurality of engagement holes 32 along the circumferential direction, and the transverse shaft 431 can move along the radial direction of the rear wheel 3 to enter into or disengage from the engagement holes 32 so that the rear wheel 3 can be locked or unlocked. In some embodiments, the longitudinal shaft 432 can be slidably directly engaged with the wheel stand 31, and the axis of the longitudinal shaft 432 is perpendicular to the axis of rotation of the rear wheel 3. The second end of the second cable 49 is directly connected to the longitudinal shaft 432. The first elastic reset member 46 may be positioned between the wheel stand 31 and the longitudinal shaft 432. In this way, the second cable 49 directly pulls the vertical shaft 432, allowing the horizontal shaft 431 to enter the engagement hole 32. Conversely, the first elastic reset member 46 may push the vertical shaft 432, allowing the horizontal shaft 431 to exit the engagement hole 32.

[0042] Referring further to Figures 10 and 11, in this embodiment, the slide sleeve 45 can be fixed to the longitudinal shaft 432. For example, the longitudinal shaft 432 may extend into the slide sleeve 45 and be connected to the slide sleeve 45 via a pin shaft 451. The slide sleeve 45 is slidably engaged with the wheel stand 31 of the rear wheel 3, and the axis of the slide sleeve 45 may be perpendicular to the axis of rotation of the rear wheel 3. A first elastic reset member 46 may be positioned between the wheel stand 31 and the slide sleeve 45. In addition, a housing groove 45a is provided at one end of the slide sleeve 45 away from the transverse shaft 431, and a second pivot joint 49b is provided at the second end of the second cable 49, with the second pivot joint 49b rotatably positioned within the housing groove 45a. In some embodiments, the second pivot joint 49b may have a spherical head that is housed between the end cap of the slide sleeve 45 and the longitudinal shaft 432. More specifically, the second pivot joint 49b abuts against the end cap of the slide sleeve 45, allowing the slide sleeve 45 to connect to the second cable 49. In this way, the second cable 49 drives the slide sleeve 45, causing the transverse shaft 431 of the locking member 43 to "stuck in" to the engagement hole 32. In this way, the first elastic reset member 46 drives the slide sleeve 45, allowing the transverse shaft 431 of the locking member 43 to exit the engagement hole 32. The arrangement of the slide sleeve 45 and the second pivot joint 49b prevents relative twisting between the locking member 43 and the second cable 49. In some embodiments, a ball can also be clamped between the second pivot joint 49b of the second cable 49 and the end cap of the slide sleeve 45. This ball arrangement can be obtained by referring to the ball 49c in Figure 13.

[0043] Referring to Figure 9, the first elastic member 44 is located within the horizontal tube 12 and positioned between the two drive pins 42 of the two brake assemblies. The first elastic member 44 is compressed when the drive member 41 switches from the initial position to the brake position. The first elastic member 44 applies force to the two drive pins 42 simultaneously when the drive member 41 switches from the brake position to the initial position, facilitating the reverse reset operation of the two drive pins 42. The drive member 41 is then held in the initial position by the engagement of the slide shaft 42a of each drive pin 42 with the chute 41a and the elongated hole 42a. The first elastic reset member 46 drives the lock member 43 to the unlocked position to facilitate the next braking of the rear wheel 3.

[0044] Referring to Figures 8 and 9, a preferred embodiment of the lock assembly 410 is shown. The lock assembly 410 can lock the drive member 41 in the brake position and unlock the drive member 41 from the brake position. The lock assembly 410 may include a lock projection 410b located on the outside of the horizontal tube 12. The sleeve portion 412 of the drive member 41 is provided with an end face 4101 that abuts against the lock projection 410b, for example. The end face 4101 is provided with a lock recess 410a. The lock projection 410b abuts against the end face 4101 and elastically deforms when the pedal portion 411 is pressed down and the drive member 41 moves from the initial position to the brake position. The lock recess 410a engages with the lock projection 410b after the drive member 41 has reached the brake position, locking the drive member 41 in the brake position. This allows the user to hold the drive member 41 in the brake position without having to continuously apply force to the drive member, improving the convenience of brake operation. When switching the drive member 41 from the brake position to the initial position, the pedal portion 411 is raised and the drive member 41 is rotated to release the engagement between the lock recess 410a and the lock projection 410b.

[0045] In this embodiment, the locking projection 410b is formed by an elastically extendable locking pin, the axis of which is parallel to the axial direction of the horizontal tube 12. More specifically, for example, a mounting hole 110 may be provided in the wheel seat 11, and a second elastic member 410c and a locking pin may be arranged within the mounting hole 110. The second elastic member 410c is configured to drive the locking pin to extend outside the mounting hole 110. One end of the locking pin that engages with the locking recess 410a may be arc-shaped or frustoconical.

[0046] Referring to Figure 8, the end face 4101 is further formed with a guide groove 410d that slidably engages with the locking projection 410b, and a locking recess 410a is provided at one end of the guide groove 410d. When the drive member 41 rotates, the locking projection 410b slides along the guide groove 410d to guide the rotation of the drive member 41.

[0047] Referring below to Figures 4 and 5, the wheelset orientation mechanism 5 comprises an operating unit 51, a third cable 52, a positioning pin 53, and a second elastic reset member 54. The third cable 52 may be a wire rope. The operating unit 5 is located on the armrest of the baby tow truck 100 and may be connected to the first end of the third cable 52. The axis of the positioning pin 53 is parallel to the axis of rotation of the wheel stand 31, and the positioning pin 53 is slidably positioned on the wheel seat 11 of the frame 1. The second end of the third cable 52 is connected to the positioning pin 53. The wheel stand 31 is provided with a positioning hole 105, and the second elastic reset member 54 provides a force that allows the positioning pin 53 to extend into the positioning hole 105. When the positioning pin 53 is inserted into the positioning hole 105, the wheel 3 is positioned and the rotation of the wheel stand 31 is locked. By operating the control unit 51, the third cable 52 pulls the positioning pin 53 out of the positioning hole 105, allowing the wheel stand 31 to rotate.

[0048] The following describes the operation process of the baby carrier 100 according to an embodiment of the present invention.

[0049] When it is necessary to brake the baby carrier, the pedal portion 411 is pressed down to rotate the drive member 41 on the horizontal tube 12. The two chutes 41a of the drive member 41 drive the slide shafts 42a of the two brake assemblies, which move toward each other. Next, the drive pins 42 of each brake assembly drive the first cable 48, which in turn drives the second cable 49, which in turn moves the locking member 43. The lateral shaft 431 of the locking member 43 may then engage with the engagement hole 32 of the rear wheel 3, locking the rotation of the rear wheel 3. The locking projection 410b of the locking assembly 410 engages with the locking recess 410a of the drive member 41, holding the drive member 41 in the brake position and keeping the baby carrier 100 in the braked state. When it is necessary to unlock the baby carrier 100, the pedal portion 411 is raised to disengage the lock recess 410a of the drive member 41 from the lock projection 410b of the lock assembly 410. The drive member 41 is reset under the action of the first elastic member 44, allowing the first cable 48 and the second cable 49 to loosen. In this case, the lock member 43 moves due to the action of the first elastic reset member 46, the transverse shaft 431 is in the engagement hole 32, the lock on the wheel 3 is released, and the baby carrier 100 can move.

[0050] When the baby carrier 100 needs to change direction, the operating unit 51 is operated, which drives the third cable 52 to move. The third cable 52 drives a positioning pin 53 out of the positioning hole 105, allowing the wheel stand 31 of the wheel 3 to rotate around the axis of the hollow shaft 47. In this case, the front wheels 2 and 3 of the baby carrier 100 can rotate in all directions, and the baby carrier 100 can turn freely. When the baby carrier does not need to change direction, the operating unit 51 is released, and the positioning pin 53 is reinserted into the positioning hole 105 by the action of the second elastic reset member 54, locking the wheel stand 31 of the rear wheel 3. In this case, the rear wheel 3 of the baby carrier 100 can only rotate and cannot rotate in all directions. The specific structure of the operating unit 51 that drives the third cable 52 can be a known structure, so a detailed explanation is omitted here.

[0051] According to an embodiment of the present invention, one drive member 41 slides two drive pins 42, and the two drive pins 42 pull two lock members 43 located near the two rear wheels 3 via two traction members, thereby achieving a double brake function with a single press. The brake structure is also relatively simple. Furthermore, the wheel stands 31 of the wheels 3 are pivotally attached to the wheel seats 11 of the frame 1, allowing the baby carrier 100 to rotate freely. In addition, the wheel stands 31 of the wheels 3 are locked or unlocked by the wheelset orientation mechanism 5, locking or unlocking the rotation of the wheel stands 31, thereby greatly improving the convenience and flexibility of using the baby carrier.

[0052] The above disclosures are merely preferred examples of the present invention and are not intended to limit the scope of the invention. Accordingly, equivalent modifications made to those described in the claims of this application are still within the scope of the invention.

Claims

1. A wheelset brake mechanism for locking the wheels of a movable frame, The wheel is attached to the movable frame via a hollow shaft so that it can rotate in all directions. The aforementioned wheelset brake mechanism is A drive member attached to the aforementioned movable frame, A brake assembly comprising a drive pin, a traction member and a locking member, The drive pin is operably connected to the drive member, the traction member includes a first cable and a second cable, the first end of the first cable is connected to the drive pin, the second end of the first cable extends into the internal cavity of the hollow shaft and is rotatably connected to the first end of the second cable, and the second end of the second cable is connected to the locking member. The drive member is configured to slide the drive pin, and the traction member slides the locking member to lock the wheel. Wheelset brake mechanism.

2. The drive member comprises a sleeve portion and a pedal portion extending from the sleeve portion, the horizontal tube of the movable frame is sleeved to the sleeve portion, an elongated hole is provided in one of the horizontal tube and the sleeve portion, a chute is provided in the other of the horizontal tube and the sleeve portion, and the drive member has an initial position and a brake position separated by a predetermined angle in the circumferential direction. The drive pin is sleeved in the horizontal tube, and the drive pin is provided with an elongated hole and a radially protruding slide shaft that passes through the chute. The drive member, when switching between the initial position and the brake position, drives the slide shaft to slide within the elongated hole and the chute. This allows the drive pin to move along the axial direction of the horizontal tube, enabling the locking member to unlock or lock the wheel. The wheelset brake mechanism according to claim 1.

3. The wheelset brake mechanism according to claim 2, further comprising a first elastic member that acts on the drive pin to hold the drive member in an initial position via the drive pin.

4. The wheelset brake mechanism according to claim 1, further comprising a first elastic reset member that acts on the locking member to maintain the locking member in an unlocked position in which the wheel is unlocked.

5. The sleeve portion is provided with two symmetrically arranged chutes, and the horizontal tube is provided with two elongated holes corresponding to the two chutes. The wheelset brake mechanism is provided with two brake assemblies, the locking members of the two brake assemblies are configured to lock the two wheels of the movable frame, and the slide shafts of each of the two brake assemblies are sleeved in corresponding sets of the chute and the elongated holes. The first elastic member is clamped between the drive pins of the two brake assemblies. The wheelset brake mechanism according to claim 3.

6. The second end of the first cable has a connector, and the connector is provided with a connecting groove. A first pivot joint is provided at the first end of the second cable, and the first pivot joint is rotatably positioned within the connecting groove. The wheelset brake mechanism according to claim 1.

7. The movable frame is provided with a wheel seat, the wheel is provided with a wheel stand, and the wheel stand is pivotally attached to the wheel seat via a vertically positioned hollow shaft. The locking member includes a horizontal shaft and a vertical shaft arranged perpendicular to each other, a slide sleeve fixed to the vertical shaft, the slide sleeve slidably engaging with the wheel stand, the axis of the slide sleeve being perpendicular to the axis of rotation of the wheel, and a accommodating groove provided at the end of the slide sleeve away from the horizontal shaft. A second pivot joint is provided at the second end of the second cable, and the second pivot joint is rotatably positioned within the housing groove. The wheelset brake mechanism according to claim 1.

8. The wheelset brake mechanism according to claim 7, wherein a first elastic reset member is disposed between the wheel stand and the slide sleeve.

9. The wheelset brake mechanism according to claim 7, wherein the vertical shaft extends into the slide sleeve and is connected to the slide sleeve via a pin shaft.

10. The wheelset brake mechanism according to claim 7, wherein the hub of the wheel is provided with a plurality of engagement holes along the circumferential direction, and the transverse shaft can enter the engagement holes to lock the wheel or exit the engagement holes to unlock the wheel.

11. The movable frame is provided with a wheel seat, and the wheel is provided with a wheel stand, which is pivotally attached to the wheel seat via a vertically positioned hollow shaft. The locking member includes a horizontal shaft and a vertical shaft arranged perpendicular to each other, the vertical shaft slidably engages with the wheel stand, and the axis of the vertical shaft is perpendicular to the axis of rotation of the wheel. The second end of the second cable is connected to the vertical shaft, The hub of the wheel is provided with a plurality of engagement holes along the circumferential direction, and the transverse shaft can enter the engagement holes to lock the wheel, or exit the engagement holes to unlock the wheel. The wheelset brake mechanism according to claim 1.

12. The drive member includes a sleeve portion and a pedal portion extending from the sleeve portion, the horizontal tube of the movable frame is sleeved to the sleeve portion, and the drive member has an initial position and a brake position separated by a predetermined angle in the circumferential direction. The wheelset brake mechanism further includes a locking assembly configured to lock the drive member in the brake position. The wheelset brake mechanism according to claim 1.

13. The lock assembly includes a locking projection located on the outside of the horizontal tube, The sleeve portion is provided with an end face that contacts the locking projection, and the end face is provided with a locking recess, and, When the locking projection engages with the locking recess, the drive member is locked in the brake position. The wheelset brake mechanism according to claim 12.

14. The wheelset brake mechanism according to claim 13, wherein the locking projection is made of an elastically expandable locking pin, and the axis of the locking pin is parallel to the axial direction of the horizontal tube.

15. The wheelset brake mechanism according to claim 14, wherein a wheel seat is provided at the end of the horizontal tube, a mounting hole is provided in the wheel seat, a second elastic member and the lock pin are arranged in the mounting hole, and the end of the lock pin, which is configured to engage with the lock recess, is arc-shaped or frustoconical.

16. The wheelset brake mechanism according to claim 14, wherein the end face is further provided with a guide groove that slidably engages with the locking projection.

17. A baby carrier comprising a movable frame and a wheelset brake mechanism according to any one of claims 1 to 16, wherein the movable frame comprises a front wheel and a rear wheel, and the rear wheel is attached to the movable frame via a hollow shaft such that the rear wheel is rotatable in all directions and the wheelset brake mechanism locks the rear wheel.

18. The movable frame is provided with a wheel seat, the rear wheel is provided with a wheel stand, and the wheel stand is pivotally attached to the wheel seat so that the rear wheel can rotate in all directions. The baby carrier further includes a wheelset orientation mechanism, which is configured to lock the rotation of the wheel stand. The baby carrier according to claim 17.

19. The wheelset orientation mechanism includes an operating unit, a third cable, a positioning pin, and a second elastic reset member, wherein the operating unit is connected to a first end of the third cable, the second end of the third cable is connected to the positioning pin, and the axis of the positioning pin is parallel to the rotation axis of the wheel stand. The wheel stand is provided with a positioning hole, the second elastic reset member is configured to drive the positioning pin to extend into the positioning hole, and the operating unit is configured to move the positioning pin out of the positioning hole via the third cable. The baby carrier according to claim 18.

20. The baby carrier according to claim 18, wherein the movable frame includes a pair of front wheels and a pair of rear wheels, each of the front wheels and the rear wheels being mounted on the movable frame so as to be able to rotate in all directions, and the wheelset orientation mechanism is configured to lock the rotation of both wheel stands of the pair of rear wheels.

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