Wheel set brake mechanism and baby transport vehicle

Abstract

To provide a wheel set brake mechanism having a simple structure and a baby transport vehicle including the same.SOLUTION: A wheel set brake mechanism includes a brake assembly including a drive member 41 attached to a movable frame, a drive pin 42, a traction member, and a lock member 43. The drive pin is operably connected to the drive member. The traction member includes a first cable 48 and second cable 49. A first end of the first cable is connected to the drive pin. A second end of the first cable is extended in an internal cavity of a hollow shaft 47, and rotatably connected to a first end of the second cable. A second end of the second cable is connected to the lock member. The drive member drives the drive pin to slide the drive pin. The traction member slides the lock member so as to lock a wheel 3.SELECTED DRAWING: Figure 9

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 contents of which are incorporated herein by reference. [Technical field]

[0002] The present invention relates to wheel braking technology, and more particularly to a wheel set braking mechanism and a baby transport equipped with the same. [Background technology]

[0003] Typically, a baby carrier is equipped with a brake mechanism. When a user presses the drive member of the brake mechanism with his / her foot, the brake mechanism can lock the rear wheels of the baby carrier to prevent accidental movement of the baby carrier and improve the safety of using the baby carrier. In some baby carriers, the brake mechanisms of the individual rear wheels are decoupled from each other. When braking, the user needs to operate the drive member of each brake mechanism separately, and each brake mechanism locks the corresponding rear wheel respectively. Such baby carriers require more complicated braking operation. In some other baby carriers, the brake mechanisms of the individual rear wheels share the same drive member. The user operates the same drive member so that the brake mechanisms can lock the rear wheels simultaneously. Such baby carriers simplify the braking operation but have a more complicated structure.

[0004] In addition, the front wheels of a baby carrier 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 tend to rotate, making it difficult for the baby carrier to move forward normally. Summary of the Invention

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a wheel set brake mechanism having a simple structure and a baby carrier equipped with the same.

[0006] In one aspect, the present invention provides a wheel set brake mechanism for locking wheels of a moveable frame. The wheels are omnidirectionally rotatably attached to the moveable frame via hollow shafts, and the wheel set brake mechanism includes a drive member attached to the moveable frame and a brake assembly including a drive pin, a traction member, and a locking member, the drive pin operably connected to the drive member, the traction member including a first cable and a second cable, a first end of the first cable connected to the drive pin, a second end of the first cable extending into an inner cavity of the hollow shaft and rotatably connected to the first end of the second cable, and a second end of the second cable connected to the locking member. The drive member is configured to drive and slide the drive pin and the traction member slides the locking member to lock the wheels.

[0007] The driving member has a sleeve portion and a pedal portion extending from the sleeve portion, the sleeve portion is sleeved on a horizontal tube of the movable frame, one of the horizontal tube and the sleeve portion is provided with an elongated hole, and the other of the horizontal tube and the sleeve portion is provided with a chute, and the driving member has an initial position and a braking position that are circumferentially spaced at a predetermined angle. The horizontal tube is sleeved on the driving pin, and the driving pin is provided with a sliding shaft that protrudes in the radial direction and passes through the elongated hole and the chute. When switching between the initial position and the braking position, the driving member drives the sliding shaft to slide in the elongated hole and the chute, so that the driving pin moves along the axial direction of the horizontal tube, and the locking member can unlock or lock the wheels.

[0008] The wheelset braking mechanism of the present invention also includes a first elastic member acting on the drive pin to hold the drive member, via the drive pin, in an initial position.

[0009] Additionally, the brake assembly further includes a first elastic reset member configured to act on the locking member to maintain the locking member in the unlocked position in which the wheel is unlocked.

[0010] Also, the sleeve portion is provided with two chutes symmetrically, and the horizontal tube is provided with two slots corresponding to the two chutes, respectively. The wheel set 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, the slide shafts of each of the two brake assemblies are sleeved with a corresponding set of chutes and slots, 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, the connector having a connecting groove, and the first end of the second cable has a first pivot joint, the first pivot joint being rotatably disposed within the connecting groove.

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

[0013] Further, a first elastic reset member is disposed between the wheel stand and the sliding sleeve.

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

[0015] In addition, the wheel hub is provided with a number of engagement holes along the circumferential direction, and the cross shaft can enter the engagement holes to lock the wheel or exit the engagement holes to unlock the wheel.

[0016] The movable frame is provided with a wheel seat, the wheel has a wheel stand, and the wheel stand is pivotally attached to the wheel stand via a vertically arranged 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 rotation axis of the wheel. The second end of the second cable is connected to the horizontal shaft. The wheel hub is provided with a plurality of engagement holes along the circumferential direction, and the horizontal shaft can enter the engagement holes to lock the wheel and exit the engagement holes to unlock the wheel.

[0017] The drive member also includes a sleeve portion and a pedal portion extending from the sleeve portion, the horizontal tube of the movable frame is fitted to the sleeve portion, the drive member has an initial position and a braking position spaced apart at a predetermined angle in a circumferential direction, and the wheel set braking mechanism further includes a locking assembly configured to lock the drive member in the braking position.

[0018] The locking assembly further includes a locking protrusion disposed on an outer side of the horizontal tube, the sleeve portion having an end surface adapted to abut against the locking protrusion, and a locking recess disposed in the end surface, and when the locking protrusion engages with the locking recess, the drive member is locked in the brake position.

[0019] The locking protrusion is formed 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] In addition, 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 a lock pin are disposed in the mounting hole, and the end of the lock pin that engages with the lock recess is arc-shaped or truncated cone-shaped.

[0021] Moreover, a guide groove that slidably engages with the locking protrusion is further provided on the end face.

[0022] In another aspect, the present application provides a baby carrier including a moveable frame and the wheel set brake mechanism as described above, wherein the moveable frame includes front and rear wheels, the rear wheels being rotatably attached to the moveable frame via hollow shafts in all directions, and the wheel set brake mechanism is configured to lock the rear wheels.

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

[0024] Further, 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 a 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, the wheel stand is provided with a locating hole, 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 out of the locating hole via the third cable.

[0025] The movable frame also includes a pair of front wheels and a pair of rear wheels, the front wheels and the rear wheels are each mounted to the movable frame so as to be 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 carrier according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a rear perspective view of the baby carrier according to one embodiment of the present invention. [Diagram 3] FIG. 3 is a perspective view of a wheel set brake mechanism, a rear wheel and part of a frame of a baby carrier according to one embodiment of the present invention. [Figure 4] FIG. 4 is a side view of a baby carrier according to one embodiment of the present invention. [Diagram 5] FIG. 5 is a partial cross-sectional side view of a rear wheel, wheel set braking mechanism and wheel set orienting mechanism in a baby carrier according to one embodiment of the present invention. [Figure 6] FIG. 6 is a partial perspective view of the rear wheels and wheel set brake mechanism of a baby carrier according to one embodiment of the present invention, with the drive members omitted for ease of illustration. [Figure 7]FIG. 7 is a perspective view showing a part of a drive member of a wheel set braking mechanism in a baby carrier according to an embodiment of the present invention. [Figure 8] FIG. 8 is a perspective view of another part of the drive member of the wheel set braking mechanism in the baby carrier according to the embodiment of the present invention. [Figure 9] FIG. 9 is a partial cross-sectional front view of the rear wheel and wheel set braking mechanism of a baby carrier according to one embodiment of the present invention, showing the second cable configuration. [Figure 10] FIG. 10 is a partial perspective view of the rear wheels and wheel set braking mechanism of a baby carrier according to one embodiment of the present invention, with the wheel stand omitted for ease of illustration. [Figure 11] FIG. 11 is a partial cross-sectional view of the locking member of the wheel set braking mechanism in the baby carrier according to one embodiment of the present invention when the drive member is in the initial position. [Figure 12] FIG. 12 is a partial cross-sectional view of the locking member of the wheel set braking mechanism in a baby carrier according to an embodiment of the present invention when the drive member is in the braking position. [Figure 13] FIG. 13 is a partial cross-sectional front view of the rear wheel and wheel set braking mechanism of a baby carrier according to an embodiment of the present invention, showing an alternative configuration of the second cable. [Figure 14] FIG. 14 is a perspective view of the second cable shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] In order to explain the technical contents, structural features and effects of the present invention in detail, the present invention will be described in detail below with reference to examples and the accompanying drawings.

[0028] As shown in Figures 1 and 2, for example, a baby carrier 100 according to an embodiment of the present invention is a baby stroller. The baby carrier 100 includes a movable frame 1 and a seat (not shown) attached to the movable frame 1, and the baby carrier 100 is provided with a wheel set brake mechanism according to an embodiment of the present invention. It goes without saying that the type of the baby carrier 100 is not limited to a stroller. Furthermore, the application range of the wheel set brake mechanism according to the embodiment of the present invention is not limited to the baby carrier 100.

[0029] The movable frame (hereinafter referred to as "frame") 1 has 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, for example, a wheel stand 31 is provided on the rear wheels 3, a horizontal tube 12 is arranged under the rear end of the frame 1, and a wheel seat 11 is provided on each side 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 stand 31 drives the rear wheels 3 to rotate freely (universal rotation). It can be seen that the rotation axis of the wheel stand 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 stand 31. It can be seen that when the baby carrier 100 travels in a horizontal plane, the rotation axis of the wheel stand 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 wheel set brake mechanism 4 is disposed on the frame 1. In this embodiment, the wheel set brake mechanism 4 may simultaneously lock the two rear wheels 3 to inhibit the rolling of the rear wheels 3 in order to realize braking of the baby carrier 100. The wheel set brake mechanism 4 may simultaneously unlock the two rear wheels 3 to enable the rolling of the rear wheels 3 and allow the baby carrier 100 to travel normally.

[0031] A wheel set orienting mechanism 5 is disposed 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, thereby prohibiting free rotation of the wheel stands 31 around their rotation axes. The wheel set orienting mechanism 5 may simultaneously release the rotation restriction of the wheel stands 31 of the two rear wheels 3, thereby allowing the wheel stands 31 to freely rotate around their rotation axes.

[0032] The structure of the wheel set brake mechanism 4 according to one embodiment of the present invention will be described below with reference to Figures 3 to 12. The wheel set 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. The following will focus on one of the brake assemblies and provide a detailed description.

[0033] Referring to FIG. 3, the driving 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 disposed outside the horizontal tube 12 so as to be rotatable around the axis of the horizontal tube 12. Referring to FIG. 7 and FIG. 8, in some embodiments, the sleeve portion 412 may be formed by butting two semi-cylindrical structures 412a and 412b together. Referring to FIG. 7, two chutes 41a may be symmetrically provided in the sleeve portion 412. Referring to FIG. 6, two long holes 12a may be provided in the horizontal tube 12. One long hole 12a corresponds to one chute 41a, and the extension direction of the long hole 12a is parallel to the axial direction of the horizontal tube 12. In other embodiments, two chutes 41a may be disposed in the horizontal tube 12, and two long holes 12a may be disposed in the sleeve portion 412. The pedal portion 411 can extend from the semi-cylindrical structure 412a so that it can be depressed by a user. In some embodiments, when the pedal portion 411 receives a depression force from a user, it can pivot the sleeve portion 412 downwards to allow the drive member 41 to rotate to a 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 a user, it can pivot the sleeve portion 412 upwards to allow the drive member 41 to rotate to an 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 to maintain the drive member 41 in the brake position. It will be appreciated that when a 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 will be described in detail below.

[0035] 6 to 9, the drive pin 42 is arranged in the horizontal tube 12 so as to be movable in the axial direction, and the axis of the drive pin 42 is, for example, parallel to the axis of the horizontal tube 12. The drive pin 42 is provided with a sliding shaft 42a protruding in the radial direction. That is, the axis of the sliding shaft 42a is perpendicular to the axis of the horizontal tube 12. The sliding shaft 42a passes through the corresponding long hole 12a and the chute 41a. Therefore, 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, when the drive member 41 rotates, the sliding shafts 42a of the two drive pins 42 are driven by the chute 41a to be slidable toward or away from each other along the long hole 12a in the axial direction of the horizontal tube 12. The movement of the two sliding shafts 42a can drive the two drive pins 42 to move toward or away from each other.

[0036] 9, the drive pin 42 of each brake assembly is connected to the lock member 43 via a traction member, and the drive pin 42 and the lock 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. The traction member is connected to the drive pin 42 at one end and to the lock member 43 at the other end.

[0037] 9, in this embodiment, the traction member can include a first cable 48 and a second cable 49 connected in series. More specifically, the wheel seat 11 is provided with a hollow shaft 47 extending downward from the wheel seat 11, the hollow shaft 47 being disposed 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. A first end of the first cable 48 is connected to the drive pin 42, a second end of the first cable 48 extends into the internal cavity 470 of the hollow shaft 47 and is rotatably connected to a first end of the second cable 49, and a second end of the second cable 49 is connected to the locking member 43.

[0038] In FIG. 9, the second end of the first cable 48 is provided with a connector 48a that is slidably engaged with, for example, the hollow shaft 47, and the connector 48a may be provided with a connection groove 480a. The second cable 49 has a first pivot joint 49a. The first pivot joint 49a is rotatably disposed in the connection groove 480a. For example, the first pivot joint 49a may contact a groove wall of the connection groove 480a via a spherical surface and be fixed in the connection groove 480a, so that the first cable 48 and the second cable 49 can rotate relatively at their joint while maintaining tension. In FIG. 9, the first pivot joint 49a is a spherical head, and a traction line of the second cable 49 is led out through a through hole of the connector 48a. The first pivot joint 49a can rotate freely in the connection groove 480a. Therefore, when the second cable 49 rotates together with the rear wheel 3, the first cable 48 and the second cable 49 are not twisted or damaged, and the operation of the drive pin 42 and the drive member 41 can be prevented from being affected.

[0039] 13 and 14, in some other embodiments, the first pivot joint 49a of the second cable 49 may be, for example, a cylindrical, conical, or bullet-shaped structure. A ball 49c may be disposed 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 the through hole of the connector 48a. The ball 49c abuts against the groove wall of the connection groove 480a, allowing the first pivot joint 49a to rotate freely with low friction resistance and low noise relative to the connection head 48a.

[0040] 9 to 12, the locking member 43 is for locking the rear wheel 3. From the above, it can be understood that when the driving member 41 rotates to the brake position, it can drive the driving pin 42 to move along the axis of the horizontal tube 12, and the driving pin 42 can drive the locking member 43 through the traction member to overcome the elastic force of the first elastic resetting member 46 and perform a locking operation, so that the locking member 43 moves to a locking position to lock the rear wheel 3. When the driving member 41 rotates to the initial position, the locking member 43 returns to an unlocking position where the lock of the rear wheel 3 is released by the action of the first elastic resetting member 46.

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

[0042] 10 and 11, in this embodiment, the sliding sleeve 45 can be fixed to the vertical shaft 432. For example, the vertical shaft 432 can extend into the sliding sleeve 45 and be connected to the sliding sleeve 45 via a pin shaft 451. The sliding sleeve 45 is slidably engaged with the wheel stand 31 of the rear wheel 3, and the axis of the sliding sleeve 45 may be perpendicular to the rotation axis of the rear wheel 3. The first elastic reset member 46 may be disposed between the wheel stand 31 and the sliding sleeve 45. In addition, the sliding sleeve 45 is provided at one end away from the horizontal shaft 431 with a receiving groove 45a, and the second end of the second cable 49 is provided with a second pivot joint 49b, which is rotatably disposed in the receiving groove 45a. In some embodiments, the second pivot joint 49b may be a spherical head that is received between an end cap of the sliding sleeve 45 and the vertical shaft 432. More specifically, the second pivot joint 49b can abut against the end cap of the sliding sleeve 45 to connect the sliding sleeve 45 to the second cable 49. In this manner, the second cable 49 can drive the sliding sleeve 45 to make the transverse shaft 431 of the locking member 43 stuck in the engagement hole 32. In this manner, the first elastic reset member 46 can drive the sliding sleeve 45 to allow the transverse shaft 431 of the locking member 43 to exit from the engagement hole 32. The arrangement of the sliding sleeve 45 and the second pivot joint 49b can prevent 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 sliding sleeve 45. This ball arrangement can be obtained with reference to the ball 49c in FIG. 13.

[0043] Referring to FIG. 9, the first elastic member 44 is disposed in the horizontal tube 12 and disposed 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 simultaneously applies a force to the two drive pins 42 when the drive member 41 switches from the brake position to the initial position, facilitating the resetting operation of the two drive pins 42 in the opposite directions. Then, the slide shaft 42a of each drive pin 42 engages with the chute 41a and the long hole 42a, thereby holding the drive member 41 in the initial position. The first elastic reset member 46 drives the lock member 43 to the unlock position to facilitate the next braking of the rear wheel 3.

[0044] 8 and 9, a preferred embodiment of the lock assembly 410 is shown. The lock assembly 410 can lock the driving member 41 in the brake position or unlock the driving member 41 from the brake position. The lock assembly 410 can include a lock protrusion 410b disposed on the outside of the horizontal tube 12. The sleeve portion 412 of the driving member 41 is provided with, for example, an end surface 4101 that abuts against the lock protrusion 410b. The end surface 4101 is provided with a lock recess 410a. The lock protrusion 410b abuts against the end surface 4101 and elastically deforms when the pedal portion 411 is pressed down and the driving member 41 moves from the initial position to the brake position. After the driving member 41 reaches the brake position, the lock recess 410a engages with the lock protrusion 410b to lock the driving member 41 in the brake position. This allows the driving member 41 to be held in the brake position without the user having to continue applying force to the driving member, improving the convenience of the brake operation. When the driving member 41 is switched from the brake position to the initial position, the pedal portion 411 is raised to rotate the driving member 41, and the engagement between the lock recessed portion 410a and the lock protruding portion 410b is released.

[0045] In this embodiment, the locking protrusion 410b is formed of an elastically expandable locking pin, and the axis of the locking pin 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 the second elastic member 410c and the locking pin may be disposed in the mounting hole 110. The second elastic member 410c is configured to drive the locking pin to extend out of the mounting hole 110. One end of the locking pin that engages with the locking recess 410a may be arc-shaped or truncated cone-shaped.

[0046] 8, a guide groove 410d that slidably engages with the lock protrusion 410b is further formed on the end surface 4101, and a lock recess 410a is provided on one end of the guide groove 410d. When the driving member 41 rotates, the lock protrusion 410b slides along the guide groove 410d to guide the rotation of the driving member 41.

[0047] In the following, referring to FIG. 4 and FIG. 5, the wheel set orientation mechanism 5 includes an operating part 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 part 5 may be arranged on the armrest of the baby carrier 100 and connected to a first end of the third cable 52. The axis of the positioning pin 53 is parallel to the rotation axis of the wheel stand 31, and the positioning pin 53 is slidably arranged 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. The positioning pin 53 is inserted into the positioning hole 105 to position the wheel 3, and the rotation of the wheel stand 31 is locked. By operating the operating portion 51, the third cable 52 pulls the positioning pin 53 out of the positioning hole 105, and the wheel stand 31 can be rotated.

[0048] The operation process of the baby carrier 100 according to the embodiment of the present invention will now be described.

[0049] When the baby carrier needs to be braked, the pedal portion 411 is pressed down to rotate the driving member 41 on the horizontal tube 12. The two chutes 41a of the driving member 41 drive the slide shafts 42a of the two brake assemblies to move toward each other. Then, the driving pins 42 of each brake assembly drive the first cable 48, which drives the second cable 49, which moves the locking member 43. Then, the horizontal shaft 431 of the locking member 43 may enter the engagement hole 32 of the rear wheel 3 to lock the rotation of the rear wheel 3. The locking protrusion 410b of the locking assembly 410 is stuck into the locking recess 410a of the driving member 41, so that the driving member 41 is held in the brake position and the baby carrier 100 is held in the brake state. When it is necessary to unlock the baby carrier 100, the pedal portion 411 is raised to release the engagement between the lock recess 410a of the drive member 41 and the lock protrusion 410b of the lock assembly 410. The drive member 41 is reset under the action of the first elastic member 44, so that the first cable 48 and the second cable 49 can be loosened. In this case, the lock member 43 is moved by the action of the first elastic reset member 46, the horizontal shaft 431 is in the engagement hole 32, the wheels 3 are unlocked, and the baby carrier 100 can travel.

[0050] When the baby carrier 100 needs to change direction, the operating unit 51 can be operated so that the operating unit 51 drives the third cable 52 to move, and the third cable 52 drives the positioning pin 53 to come out of the positioning hole 105 so that the wheel stand 31 of the wheel 3 can rotate around the axis of the hollow shaft 47. In this case, the front wheel 2 and the wheel 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 to lock 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 may be a known structure, so a detailed description is omitted here.

[0051] According to the embodiment of the present invention, one driving member 41 slides and drives two driving pins 42, and the two driving pins 42 pull two locking members 43 arranged near the two rear wheels 3 through two traction members, thereby realizing the function of double braking with one depression. In addition, the brake structure is also relatively simple. Furthermore, the wheel stand 31 of the wheel 3 is pivotally mounted on the wheel seat 11 of the frame 1, so that the baby carrier 100 can rotate freely. In addition, the wheel stand 31 of the wheel 3 is locked or unlocked by the wheel set orientation mechanism 5, which locks or unlocks the rotation of the wheel stand 31, thereby greatly improving the convenience and flexibility of the use of the baby carrier.

[0052] The above disclosure is merely a preferred example of the present invention and is not used to limit the scope of the present invention. Therefore, any equivalent modifications made to the claims of this application still fall within the scope of the present invention.

Claims

1. A wheel set brake mechanism for locking the wheels of the movable frame, comprising: The wheels are attached to the movable frame via hollow shafts so as to be rotatable in all directions; The wheel set braking mechanism includes: a drive member attached to the movable frame; a brake assembly including a drive pin, a traction member, and a locking member; the drive pin is operably connected to the drive member, the traction member including a first cable and a second cable, a first end of the first cable connected to the drive pin, a second end of the first cable extending into an interior cavity of the hollow shaft and rotatably connected to a first end of the second cable, and a second end of the second cable connected to the locking member; The drive member is configured to slide the drive pin, and the traction member slides the lock member to lock the wheel. Wheel set braking mechanism.

2. the driving member includes a sleeve portion and a pedal portion extending from the sleeve portion, a horizontal tube of the movable frame is sleeved in the sleeve portion, one of the horizontal tube and the sleeve portion is provided with a slot, and the other of the horizontal tube and the sleeve portion is provided with a chute, and the driving member has an initial position and a brake position spaced apart at a predetermined angle in a circumferential direction; the drive pin is sleeved in the horizontal tube, the drive pin is provided with a radially projecting slide shaft passing through a slot and a chute; the driving member drives the slide shaft to slide within the elongated hole and the chute when switching between the initial position and the brake position; This allows the drive pin to move axially along the horizontal tube and the locking member to unlock or lock the wheel.

2. The wheelset braking mechanism of claim 1.

3. 3. The wheelset braking mechanism of claim 2, further comprising a first resilient member acting on said drive pin to hold said drive member in an initial position via said drive pin.

4. 2. The wheelset brake mechanism of claim 1, wherein said brake assembly further includes a first resilient reset member acting on said locking member to maintain said locking member in an unlocked position in which said wheel is unlocked.

5. The sleeve portion is provided with two chutes symmetrically, and the horizontal tube is provided with two oblong holes corresponding to the two chutes, respectively; the wheel set braking mechanism includes two brake assemblies, the locking members of the two brake assemblies are configured to lock two wheels of the movable frame, and the slide shafts of each of the two brake assemblies are sleeved into a corresponding set of the chutes and the slots; the first resilient member is clamped between the drive pins of the two brake assemblies; 4. A wheelset braking mechanism according to claim 3.

6. a second end of the first cable having a connector, the connector having a connection groove; a first pivot joint is provided at a first end of the second cable, the first pivot joint being rotatably disposed within the connecting groove; 2. The wheelset braking mechanism of 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 connected to the wheel seat via a vertically arranged hollow shaft; The locking member includes a horizontal shaft and a vertical shaft arranged at right angles to each other, a sliding sleeve is fixed to the vertical shaft, the sliding sleeve slidably engages with the wheel stand, the axis of the sliding sleeve is perpendicular to the rotation axis of the wheel, and an end of the sliding sleeve remote from the horizontal shaft is provided with a receiving groove; a second end of the second cable is provided with a second pivot joint, the second pivot joint being rotatably disposed within the receiving groove; 2. The wheelset braking mechanism of claim 1.

8. 8. The wheelset brake mechanism of claim 7, further comprising a first resilient reset member disposed between said wheel stand and said sliding sleeve.

9. 8. The wheelset braking mechanism of claim 7, wherein said longitudinal shaft extends within said sliding sleeve and is connected to said sliding sleeve via a pin shaft.

10. 8. The wheel set brake mechanism according to claim 7, wherein the hub of the wheel is provided with a plurality of engagement holes along a circumferential direction, and the cross shaft can enter the engagement holes to lock the wheel and 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 connected to the wheel seat via a vertically arranged 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 an axis of the vertical shaft is perpendicular to the rotation axis of the wheel; the second end of the second cable is connected to the longitudinal shaft; The wheel hub is provided with a plurality of engagement holes along a circumferential direction, and the horizontal shaft can enter the engagement holes to lock the wheel and exit the engagement holes to unlock the wheel.

2. The wheelset braking mechanism of claim 1.

12. the driving member includes a sleeve portion and a pedal portion extending from the sleeve portion, a horizontal tube of the movable frame is sleeved in the sleeve portion, and the driving member has an initial position and a brake position spaced apart at a predetermined angle in a circumferential direction; the wheelset braking mechanism further including a locking assembly configured to lock the drive member in the braking position.

2. The wheelset braking mechanism of claim 1.

13. The locking assembly includes a locking protrusion disposed on an exterior side of the horizontal tube; The sleeve portion has an end surface that comes into contact with the locking protrusion, and the end surface is provided with a locking recess, and When the locking protrusion engages with the locking recess, the driving member is locked in the brake position.

13. A wheelset braking mechanism according to claim 12.

14. 14. The wheelset braking mechanism according to claim 13, wherein said locking projection comprises a resiliently expandable locking pin, the axis of said locking pin being parallel to the axial direction of said horizontal tube.

15. 15. The wheel set brake mechanism according to claim 14, wherein a wheel seat is provided at an end of the horizontal tube, the wheel seat is provided with a mounting hole, a second elastic member and the locking pin are disposed in the mounting hole, and an end of the locking pin configured to engage with the locking recess is arc-shaped or truncated cone-shaped.

16. 15. The wheelset brake mechanism according to claim 14, wherein said end surface is further provided with a guide groove for slidable engagement with said locking protrusion.

17. A baby carrier comprising a movable frame and the wheel set brake mechanism according to any one of claims 1 to 16, the movable frame having front and rear wheels, the rear wheels being attached to the movable frame via hollow shafts such that the rear wheels are rotatable in all directions and the wheel set brake mechanism locks the rear wheels.

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 stand so that the rear wheel can rotate in all directions; the baby stroller further includes a wheel set orientation mechanism, the wheel set orientation mechanism configured to lock the rotation of the wheel stand.

18. A baby carrier according to claim 17.

19. the wheel set orientation mechanism includes an operating portion, a third cable, a positioning pin, and a second elastic reset member, the operating portion is connected to a first end of the third cable, the second end of the third cable is connected to the positioning pin, and an axis of the positioning pin is parallel to a 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.

20. A baby carrier according to claim 18.

20. 19. The baby carrier of 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 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.

Images