Wheel brake mechanism and baby carriage

Abstract

The present invention discloses a wheel brake mechanism and a baby stroller, comprising a driving member and a brake assembly. The brake assembly comprises a driving pin, a traction member, a pushing member, a thrust member, and a locking member. The driving pin is connected to one end of the traction member, the other end of the traction member is connected to the pushing member, and the pushing member is movably disposed within the wheel seat of the baby stroller; the thrust member is movably disposed within the pushing member, and the thrust member is connected to the locking member. The driving member drives the driving pin of the brake assembly to move, thereby driving the pushing member to move via the traction member, and then the pushing member drives the locking member to move, thereby locking or releasing the wheel. The present invention can achieve a dual-brake function with one step, has a simple structure, and is easy to operate.

Description

Technical Field

[0001] The present invention relates to a baby carriage, and in particular to a wheel brake mechanism and a baby carriage with the mechanism. Background Art

[0002] Existing strollers generally have a brake mechanism. When the stroller stops, simply pedaling the brake mechanism locks the stroller's wheels, preventing the stroller from moving, avoiding accidents, and improving safety. However, existing stroller brake mechanisms generally come in two types: one that locks a single wheel, necessitating two brake mechanisms to brake the two rear wheels separately; the other that locks both wheels simultaneously. Both existing brake mechanisms suffer from complex structures and inconvenient operation. Furthermore, existing strollers have universal front wheels, while the rear wheels cannot rotate in all directions. This makes them difficult to operate and inflexible in certain situations, such as lateral movement. Some strollers with both universal front and rear wheels lack a mechanism to steer the rear wheels. Therefore, the rear wheels can easily rotate during normal forward travel, which in turn affects the stroller's mobility. Consequently, these strollers are inconvenient to use. Summary of the Invention

[0003] The object of the present invention is to provide a wheel brake mechanism which realizes a double brake function with one step, has a simple structure and is easy to operate.

[0004] Another object of the present invention is to provide a baby carriage with a simple structure and easy operation.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a wheel brake mechanism suitable for locking the wheels of a baby stroller, including a driving member and a brake assembly, the brake assembly including a driving pin, a traction member, a pushing member, a pushing member and a locking member, the driving pin is connected to one end of the traction member, and the other end of the traction member is connected to the pushing member, and the pushing member is movably arranged in the wheel seat of the baby stroller; the pushing member is movably arranged in the pushing member, and the pushing member is connected to the locking member, and the driving member drives the driving pin of the brake assembly to move, so as to drive the pushing member to move through the traction member, and then the pushing member drives the locking member to move, so as to lock or release the wheel.

[0006] Compared with the prior art, the present invention utilizes a driving member to drive the driving pin to move, so that the driving pin drives the traction member, and utilizes the flexible extensible property of the traction member so that the traction member can extend to the wheel and pull the pushing member, and then utilizes the pushing member to drive the pushing member and the locking member arranged near the wheel, so that the locking member can lock the wheel. Therefore, the user only needs to step on the driving member to lock the wheel, which can realize the function of double brakes with one step, and has a simple structure and easy operation.

[0007] Preferably, there are two brake assemblies, and the driving member drives the driving pins of the two brake assemblies to move simultaneously.

[0008] Preferably, the pushing member is provided with an inclined groove, and the pushing member is provided with a movable pin, which is movably inserted into the inclined groove so that the pushing member moves closer to or away from the axis of the wheel.

[0009] Specifically, the locking member is partially sleeved in the pushing member. When the movable pin moves in the inclined slot, the locking member moves closer to or farther away from the axis of the wheel along with the pushing member.

[0010] Specifically, the locking member is movably connected to the pushing member, and a reset member is provided between the locking member and the pushing member.

[0011] Preferably, the driving member is symmetrically provided with a pair of drive bevels, and a drive shaft is provided on the outside of the driving pin perpendicular to its central axis. The drive shaft is movably inserted into the drive bevels, so that when the driving member rotates, the drive pin is moved through the drive bevels. By providing the drive bevels, the drive bevels can convert the torque generated by the rotation of the driving member into an axial pulling force on the driving pin, thereby causing the driving pin to stretch the pulling member, which in turn stretches the pushing member, causing the pushing member to drive the pushing member and the locking member, thereby achieving the purpose of driving the locking member.

[0012] Preferably, the invention further comprises an elastic member, which is arranged between the two driving pins. The elastic member can provide an elastic force for the driving pin to reset so that the driving pin can achieve repeated action.

[0013] Preferably, the traction member includes a first traction member and a second traction member, one end of the first traction member is connected to the driving pin, the other end of the first traction member is rotatably connected to one end of the second traction member, and the other end of the second traction member is connected to the pushing member.

[0014] Specifically, the first pulling member is provided with a connector, the second pulling member is provided with a pivot joint, a receiving portion is provided between the first pulling member and the second pulling member, the connector is provided within the receiving portion, and the pivot joint is rotatably provided within the receiving portion to connect the first pulling member and the second pulling member. By cooperating with the pivot joint and freely rotating within the receiving portion, the first pulling member can be prevented from twisting due to the rotation of the wheel after the first pulling member and the second pulling member are connected, thereby avoiding affecting the operation of the drive pin and the drive member.

[0015] Specifically, the pusher is provided with a convex receiving portion, and the second pulling member has a pivot joint disposed within the convex receiving portion, connecting the pusher and the second pulling member. The convex receiving portion cooperates with the pivot joint, and since the pivot joint can freely rotate within the convex receiving portion, the connection between the second pulling member and the pusher can prevent the second pulling member from twisting due to the rotation of the wheel.

[0016] Specifically, the pivot joint is a spherical head.

[0017] Preferably, the wheel brake mechanism further includes a rear leg tube, the rear leg tube is arranged on the frame of the baby carriage, the wheel is sleeved on the rear leg tube, and the accommodating portion is movably arranged in the rear leg tube.

[0018] Specifically, the wheelset brake mechanism also includes a first sleeve and a second sleeve, the first sleeve is fixed in the rear leg tube, the second sleeve is built into the rear leg tube and is rotatably connected to the first sleeve; an internal space is enclosed between the first sleeve and the second sleeve for the first traction member and the second traction member to pass through, and the accommodating portion is located in the internal space.

[0019] Preferably, the wheelset brake mechanism further comprises an elastic reset member, which provides an elastic force for restoring the pushing member.

[0020] Preferably, the wheel hub is provided with engaging holes distributed around the rolling axis of the wheel, with the openings of the engaging holes facing outwards. The locking member can enter the engaging holes to lock the wheel or exit the engaging holes to release the wheel.

[0021] Preferably, the driving member is a sleeve-shaped structure and is rotatably sleeved on a crossbar of the baby carriage frame, and a pedal for being stepped on is extended from the driving member.

[0022] A locking assembly is provided between the driving member and the frame to lock or unlock the driving member.

[0023] Specifically, the locking assembly includes a locking pin provided on the driver and two locking recesses provided on the vehicle frame. When the driver rotates to lock the wheel, the locking pin engages with one of the locking recesses to position the driver. When the driver rotates to release the wheel, the locking pin engages with the other locking recess to position the driver. The locking pin and the locking recesses allow the driver to remain locked to the wheel, eliminating the need for the user to maintain force on the driver, thus improving user convenience. Furthermore, when releasing the wheel, the driver remains stable, preventing accidental rotation of the driver and the resulting wheel lock.

[0024] Specifically, the locking pin is movably disposed on the driving member, and the locking assembly further includes a compression spring disposed between the locking pin and the driving member to drive the locking pin to extend.

[0025] Specifically, a guide groove is provided on one side of the driving member, and the guide groove is arranged between the two locking recesses. When the driving member rotates and releases the wheel, the locking pin slides along the guide groove to the other locking recess. When the driving member rotates and locks the wheel, the locking pin slides along the guide groove to one of the locking recesses.

[0026] A baby carriage comprises a frame and a pair of universally rotatable front wheels, a pair of rear wheels and a wheel brake mechanism. The wheel brake mechanism is arranged on the frame and can lock the two rear wheels at the same time to prevent the rear wheels from rolling.

[0027] Preferably, the stroller further includes a wheel orientation mechanism. The rear wheels are pivotally connected to wheel mounts, which are universally rotatable on the frame. The wheel orientation mechanism simultaneously limits the positions of both wheel mounts to prevent universal rotation of the rear wheels, or simultaneously releases the limits to allow universal rotation of the wheel mounts. By allowing the wheel mounts to universally rotate relative to the frame, the stroller can move laterally, providing the ability to drift. Furthermore, by locking or unlocking the wheel mounts using the wheel orientation mechanism, the drifting and non-drifting functions can be switched at any time, greatly improving convenience and flexibility.

[0028] Specifically, the wheel set orientation mechanism includes an operating part, a third traction member, a positioning pin and a return spring. The operating part is connected to one end of the third traction member, and the other end of the third traction member is connected to the positioning pin. The return spring provides an elastic force to reset the positioning pin. The positioning pin can be inserted into the wheel seat and position the rear wheel or withdraw from the wheel seat and release the rear wheel.

[0029] Specifically, the operating part is movably arranged on the frame of the baby carriage, and the operating part is symmetrically provided with two inclined slides, and the end of the third traction member is provided with a moving head, which is movably arranged on the frame and movably inserted into the inclined slide.

[0030] Specifically, a bearing is provided between the vehicle frame and the wheel seat. By providing the bearing, the rotation between the vehicle frame and the wheel seat can be made more stable and smooth, ensuring that the wheel seat can rotate in all directions.

[0031] Specifically, the frame has a rear leg tube, the wheel seat has a pivot sleeve pivotally connected to the rear leg tube, and the bearing is arranged between the pivot sleeve and the rear leg tube.

[0032] Specifically, the wall surface of the pivot sleeve that contacts the outer wall of the bearing has a tooth-like structure in the circumferential direction. By adding the tooth-like structure, the deformation of the pivot sleeve can be increased, thereby preventing the pivot sleeve from breaking and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front perspective view of the baby carriage of the present invention.

[0034] Figure 2 It is a rear perspective view of the baby carriage of the present invention.

[0035] Figure 3 It is a three-dimensional diagram of the rear wheel and wheel brake mechanism of the baby carriage of the present invention.

[0036] Figure 4 It is a structural diagram of the rear wheel and the internal structure of the wheel assembly brake mechanism of the baby carriage of the present invention.

[0037] Figure 5 It is a cross-sectional view of the rear wheel and the interior of the wheel brake mechanism of the baby carriage of the present invention.

[0038] Figure 6 It is a side sectional view of the rear wheel, wheel set brake mechanism and wheel set orientation mechanism of the baby carriage of the present invention.

[0039] Figure 7 It is a diagram of the internal structure of the rear leg tube of the baby carriage of the present invention.

[0040] Figure 8 It is a structural diagram of the pusher, the pusher and the locking member of the baby carriage of the present invention.

[0041] Figure 9 The present invention is a structural diagram of the rear wheel and wheel brake mechanism of the baby carriage without the driving parts.

[0042] Figure 10 It is a structural diagram of the upper half of the driving component of the wheel brake mechanism of the baby stroller of the present invention.

[0043] Figure 11 4 is a state diagram of the locking assembly 410 after the pedal of the baby stroller of the present invention is stepped on.

[0044] Figure 12 4 is a state diagram of the locking assembly 410 after the pedal of the baby stroller of the present invention is lifted.

[0045] Figure 13 This is a diagram showing the state of the wheel brake mechanism of the baby stroller of the present invention when the rear wheels are released.

[0046] Figure 14 This is a diagram showing the state of the baby stroller of the present invention when the wheel brake mechanism locks the rear wheel.

[0047] Figure 15 This is a perspective view of the baby stroller of the present invention when the wheel brake mechanism releases the rear wheel.

[0048] Figure 16 It is a structural diagram of the bearing in the wheel seat of the baby carriage of the present invention.

[0049] Figure 17 It is a side sectional view of the baby carriage of the present invention when the wheel set orientation mechanism locks the rear wheel.

[0050] Figure 18 1. It is a diagram showing the internal structure of the operating portion of the wheel set orientation mechanism of the baby stroller of the present invention.

[0051] Stroller 100

[0052] Frame 1, front wheel 2, rear wheel 3, wheel brake mechanism 4, wheel orientation mechanism 5

[0053] Wheel seat 11, transverse tube 12, elongated hole 12a

[0054] Wheel seat 31, engaging hole 32, pivot sleeve 31a, bearing 33, tooth structure 311

[0055] Driving member 41, driving pin 42, locking member 43, elastic member 44, pushing member 45, elastic reset member 46, rear leg tube 47, first pulling member 48, second pulling member 49, locking assembly 410, pedal 411, pushing member 412, inclined groove 412a, accommodating protrusion 412b, reset component 413, first sleeve 414, second sleeve 415, driving inclined groove 41a, driving shaft 42a, moving pin 45a, accommodating portion 48a, pivot joint 49a, pivot joint 49b, locking recess 410a, locking pin 410b, compression spring 410c, guide groove 410d

[0056] Operating part 51, third traction member 52, positioning pin 53, return spring 54, inclined slide 51a, moving head 52a DETAILED DESCRIPTION

[0057] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0058] like Figure 1 and Figure 2 As shown, the baby carriage 100 of the present invention includes a frame 1, a pair of universally rotatable front wheels 2, a pair of rear wheels 3, a wheel set brake mechanism 4, and a wheel set orientation mechanism 5. The rear wheels 3 are pivotally connected to the wheel seat 31 in a rolling manner. The wheel seat 31 is universally rotatable on the frame 1. The rolling axis of the rear wheels 3 and the rotation center axis of the wheel seat 31 are perpendicular to each other. The wheel set brake mechanism 4 is provided on the frame 1 and can lock the two rear wheels 3 at the same time to prevent the rear wheels 3 from rolling, or release the locks at the same time to allow the rear wheels 3 to roll. The wheel set orientation mechanism 5 is provided on the frame 1 and can limit the two rear wheels 3 at the same time to prevent the rear wheels 3 from universally rotating around the rotation center axis of the wheel seat 31, or release the limit at the same time to allow the rear wheels 3 to universally rotate around the rotation center axis of the wheel seat 31. Specifically, as follows:

[0059] Combine Figure 1 and Figure 2 , and see Figures 3 to 8The wheel brake mechanism 4 includes a drive member 41 and a brake assembly. In this embodiment, due to the presence of two rear wheels 3, there are two brake assemblies. These two brake assemblies are symmetrically arranged and driven by the same drive member 41, with each brake assembly controlling one rear wheel 3. Each brake assembly includes a drive pin 42, a traction member, a locking member 43, an elastic member 44, a thrust member 45, an elastic return member 46, and a pusher 412. The wheel brake mechanism 4 can simultaneously lock or release both rear wheels 3. Specifically, wheel seats 11 are provided on either side of the rear end of the frame 1. A cross tube 12 is disposed between the two wheel seats 11. The drive member 41 is a sleeve-like structure that can be rotatably sleeved onto the cross tube 12 about its central axis. A pedal 411 extends from the drive member 41. The drive pin 42 is axially movable within the cross tube 12 along its central axis. The drive member 41 can simultaneously drive both drive pins 42 to move. An elastic member 44 is disposed between the two drive pins 42, providing a resilient force to reset the drive pins 42, allowing them to repeat their movements. Since the two brake assemblies are symmetrically arranged, the locking and unlocking structures on each side are identical. Therefore, the following description will focus on only one side of the brake assembly. The drive pin 42 is connected to one end of a traction member, which is located within the cross tube 12. The other end of the traction member is connected to a pusher 412, which is movably disposed within the stroller's wheel seat 31. A pusher 45 is movably disposed on the pusher 412, with the pusher 412's movement within the wheel seat 31 perpendicular to that of the pusher 45. The pusher 45 is connected to the locking member 43. The drive member 41 can simultaneously drive the drive pins 42 of both brake assemblies to move, thereby driving the pusher 412 through the traction member, which in turn drives the locking member 43 to lock or unlock the rear wheel 3 on the same side. The pushing member 412 is provided with an oblique groove 412a, and the pushing member 45 is provided with a movable pin 45a. The movable pin 45a is movably inserted into the oblique groove 412a so that the pushing member 45 moves closer to the rear wheel 3. The locking member 43 is movably connected to the pushing member 45. A reset component 413 is provided between the locking member 43 and the pushing member 45. Specifically, the locking member 43 has a T-shaped structure, wherein the vertical axis is movably connected to the pushing member 45, and the horizontal axis of the locking member 43 extends outside the pushing member 45. One end of the reset component 413 abuts against the end of the vertical axis, and the other end abuts against the inner bottom of the pushing member 45. The reset component 413 is a compression spring. More specifically, the pushing member 45 has an accommodating space inside, which passes through one end of the pushing member 45. The reset component 413 is built into the accommodating space of the pushing member 45. When the locking member 43 and the pushing member 45 approach the axis of the rear wheel 3, the locking member 43 retracts into the pushing member 45 and the reset component 413 is squeezed; conversely, when the locking member 43 and the pushing member 45 move away from the axis of the rear wheel 3, the reset component 413 stretches under the action of its own elastic force, causing the locking member 43 to extend.The elastic return member 46 provides a resilient force to reset the locking member 43, allowing it to automatically disengage from the rear wheel 3. The elastic return member 46 is disposed within the wheel seat 31, with one end abutting against the pushing member 45 and the other end abutting against the inner wall of the wheel seat 31. The elastic return member 46 is a compression spring. When the pushing member 45, driven by a force, approaches the axis of the rear wheel 3, the elastic return member 46 is compressed. Conversely, when the driving force from the pushing member 45 ceases, the elastic return member 46, under its own elastic force, pulls the pushing member 45 and the locking member 43 away from the rear wheel 3.

[0060] See also Figures 9 and 10 More specifically, a pair of symmetrically disposed drive slits 41a are provided on the wall surface of the driving member 41. The distance between the ends of the two drive slits 41a is smaller than the distance between the other ends. The driving pin 42 is provided with a drive shaft 42a, the central axis of which is perpendicular to the direction of movement of the driving pin 42. The transverse tube 12 is provided with an elongated hole 12a extending along the central axis of the transverse tube 12. The drive shaft 42a is movably inserted into the elongated hole 12a and the drive slits 41a, so that the drive pin 42 is moved via the drive slits 41a when the driving member 41 rotates. By providing the drive slits 41a, the drive pin 42 can be driven to move via the drive slits 41a. By providing the drive slits 41a, the torque generated by the rotation of the driving member 41 is converted into an axial pulling force on the driving pin 42, thereby causing the driving pin 42 to stretch the traction member, which in turn stretches the locking member 43 via the traction member, thereby driving the locking member 43 to operate.

[0061] For example Figure 6 and Figure 7As shown, the wheel brake mechanism 4 also includes a rear leg tube 47, which is fixedly mounted on the wheel seat 11 of the frame 1 and has its lower end extending downwardly from the wheel seat 11. The rear wheel seat 31 is rotatably connected to the rear leg tube 47. The pulling member includes a first pulling member 48 and a second pulling member 49, each of which is a steel wire. One end of the first pulling member 48 is connected to the drive pin 42, and the other end of the first pulling member 48 extends into the rear leg tube 47 and is rotatably connected to one end of the second pulling member 49. The other end of the second pulling member 49 is connected to the pusher 412. More specifically, the first pulling member 48 is located at one end of the rear leg tube 47 and has a connector 48b integrally connected to the first pulling member 48. The second pulling member 49 has a pivot joint 49a integrally connected to the second pulling member 49 at one end. The pivot joint 49a is a spherical head. A receiving portion 48a is provided between the first and second pulling members 48, 49. This hollow portion has openings at both its upper and lower ends. A connector 48b is inserted through the upper opening and snaps into place within the receiving portion 48a. A pivot joint 49a is inserted through the lower opening and pivotally snaps into place within the receiving portion 48a, connecting the first and second pulling members 48, 49. The receiving portion 48a is suspended within the rear leg 47. Specifically, the pivot joint 49a is pivotally mounted within the receiving portion 48a, with its spherical surface in point contact with the bottom surface of the receiving portion 48a, reducing friction and ensuring smoother rotation. The traction line of the second pulling member 49 is routed outward through the lower opening of the receiving portion 48a. By cooperating between the accommodating portion 48a and the pivot joint 49a, and because the pivot joint 49a can freely rotate within the accommodating portion 48a, the connection between the first pulling member 48 and the second pulling member 49 can prevent the first pulling member 48 from twisting due to the rotation of the rear wheel seat 31, thereby avoiding affecting the operation of the drive pin 42 and the drive member 41. The wheel assembly brake mechanism 4 also includes a first sleeve 414 and a second sleeve 415. The first sleeve 414 is fixed within the rear leg tube 47, and the second sleeve 415 is internally mounted within the rear leg tube 47 and rotatably connected to the first sleeve 414. The first sleeve 414 and the second sleeve 415 define an internal space through which the first pulling member 48 and the second pulling member 49 can pass, and the accommodating portion 48a is located within the internal space. By providing a first sleeve 414 and a second sleeve 415, and allowing the second sleeve 415 to rotate relative to the first sleeve 414, the accommodating portion 48a is protected while also preventing interference with the rotation of the wheel seat 31. When the wheel seat 31 rotates, the accommodating portion 48a, the connector 48b, and the first sleeve 414 do not rotate, while the pivot joint 49a and the second sleeve 415 rotate with the wheel seat 31.

[0062] like Figure 7and Figure 16 As shown, a bearing is provided between the vehicle frame 1 and the wheel seat 31. Specifically, a bearing 33 is provided between the rear leg tube 47 and the wheel seat 31. The provision of the bearing 33 allows for more stable and smooth rotation between the rear leg tube 47 and the wheel seat 31, ensuring universal rotation of the wheel seat 31. Specifically, the wheel seat 31 includes a pivot sleeve 31a pivotally connected to the rear leg tube 47. The bearing 33 is disposed within the pivot sleeve 31a, and the circumferential surface of the pivot sleeve 31a where it contacts the outer wall of the bearing 33 is formed with a tooth-like structure 311. The addition of the tooth-like structure 311 increases the deformation of the pivot sleeve 31a, thereby preventing cracking of the pivot sleeve 31a and extending its service life.

[0063] Also, see Figure 6 More specifically, the pushing member 412 is provided with an outwardly protruding receiving protrusion 412b. The second pulling member 49 has a spherical pivot joint 49b at the other end. The pivot joint 49b is rotatably disposed within the receiving protrusion 412b and forms spherical contact with the receiving protrusion 412b, connecting the pushing member 412 to the second pulling member 49. One end of the elastic return member 46 abuts against the end of the push member 45, while the other end abuts against the inside of the wheel seat 31. By fitting the receiving protrusion 412b with the pivot joint 49b, the pivot joint 49b can freely rotate within the receiving protrusion 412b. Therefore, the connection between the second pulling member 49 and the pushing member 412 prevents the second pulling member 49 from twisting due to the rotation of the wheel.

[0064] For example Figure 11 and Figure 12 As shown, a locking assembly 410 is provided between the driver 41 and the frame 1 to lock or unlock the driver 41. Specifically, the locking assembly 410 includes a locking pin 410b movably disposed on the driver 41, two locking recesses 410a disposed on the crossbar of the frame, and a compression spring 410c. The compression spring 410c is disposed between the locking pin 410b and the driver 41 to force the locking pin 410b to extend. When the driver 41 rotates to lock the rear wheel, the locking pin 410b engages with one of the locking recesses 410a to position the driver 41. When the driver 41 rotates to release the rear wheel, the locking pin 410b engages with the other locking recess 410a to position the driver 41. This allows the driver 41 to remain locked to the wheel without requiring the user to continuously apply force to the driver 41, thereby improving user convenience. A guide groove 410d is also provided on one side of the driving member 41. The guide groove 410d is arranged between the two locking recesses 410a. When the driving member 41 rotates and releases the rear wheel, the locking pin 410b can slide along the guide groove 410d to the other locking recess 410a. When the driving member 41 rotates and locks the rear wheel, the locking pin 410b slides along the guide groove 410d to one of the locking recesses 410a, thereby guiding the driving member 41 when it rotates.

[0065] See also Figures 13 to 15 The hub of the rear wheel 3 is provided with engaging holes 32 distributed circumferentially around the rolling axis of the rear wheel 3 , and the openings of the engaging holes 32 face outward. The transverse axis of the locking member 43 can enter the engaging hole 32 to lock the rear wheel 3 or exit the engaging hole 32 to release the rear wheel 3.

[0066] See also Figure 17 and Figure 18 The wheel orientation mechanism 5 includes an operating unit 51, a third pulling member 52, a positioning pin 53, and a return spring 54. The third pulling member 52 is a steel wire. The operating unit 51 is mounted on the armrest of the stroller 100 and connected to one end of the third pulling member 52. The positioning pin 53 is located near the rear wheel 3 and is movably mounted on the stroller frame 1. The other end of the third pulling member 52 extends near the rear wheel 3 and is connected to the positioning pin 53. The return spring 54 provides an elastic force to return the positioning pin 53 to its original position. The return spring 54 is positioned between the positioning pin 53 and the wheel seat 11. The positioning pin 53 can be inserted into the positioning hole of the wheel seat 31 to position the rear wheel 3 (i.e., the rear wheel 3 is locked), or withdrawn from the wheel seat 31 to release the rear wheel 3 (i.e., the rear wheel 3 is released, in which case the four wheels can rotate in all directions, achieving a drifting function). The operating portion 51 is movably mounted on the handle of the frame 1 of the stroller 100, and the operating portion 51 is symmetrically provided with two inclined slots 51a. The two inclined slots 51a are symmetrically arranged, and the distance between the ends of the two inclined slots 51a on the same side is smaller than the distance between the ends of the two inclined slots on the same side. The end of the third traction member 52 is provided with a moving head 52a. The moving head 52a is movably mounted on the frame 1, and the moving direction is perpendicular to the moving direction of the operating portion 51. The moving heads 52a of the two third traction members 52 are movably inserted into the inclined slots 51a. Therefore, when the user presses the operating portion 51, the two moving heads 52a can be driven to move closer to or away from each other through the inclined slots 51a, so that the two third traction members 52 connected to their respective moving heads 52a are subjected to a pulling force to drive the positioning pin 53.

[0067] In summary, and in conjunction with the accompanying drawings, when the stroller needs to be braked, the pedal is depressed, causing the driving member 41 to rotate on the cross tube 12. The driving chute 41a of the driving member 41 drives the driving shaft 42a from one end of the driving chute 41a to the other, causing the driving pin 42 to move. The driving pin 42 then drives the first pulling member 48, which in turn drives the second pulling member 49, which in turn drives the pushing member 412. The pushing member 412 drives the pushing member 45 via the chute 412a and the moving pin 45a. The pushing member 45 drives the locking member 43, which then enters the engaging hole 32 of the rear wheel 3, thereby engaging and locking the rear wheel 3. At this point, the rear wheel 3 cannot roll, and the stroller 100 is in a braked state, unable to travel. When unlocking is required, the pedal needs to be lifted so that the pedal drives the driving member 41. The driving member 41 can be reset under the action of the elastic member 44, thereby releasing the first traction member 48 and the second traction member 49. Under the action of the elastic reset member 46, the pushing member 412 and the pushing member 45 are reset. At this time, the locking member 43 exits the engaging hole 32, thereby releasing the lock on the rear wheel 3, and the stroller 100 can be driven.

[0068] When the stroller 100 is to be placed in a drifting state, while the wheel brake mechanism 4 remains unlocked on the rear wheel 3, the operating portion 51 is operated, causing the operating portion 51 to move the third traction member 52. The third traction member 52 then drives the positioning pin 53 out of the positioning hole of the wheel seat 31, allowing the rear wheel 3 to rotate about the rear leg tube 47. The rotation of the wheel seat 31 causes the second sleeve 415 to rotate relative to the first sleeve 414, and the pivot joint 49a of the second traction member 49 to rotate within the accommodating portion 48a. At this point, both the front and rear wheels 2, 3 of the stroller 100 can rotate, allowing the stroller 100 to perform drifting maneuvers such as lateral movement. When the operating portion 51 is released, the positioning pin 53, under the action of the return spring, re-locks the rear wheel 3. The rear wheels 3 of the stroller 100 can only roll, not rotate, and the stroller 100 is now in a non-drifting state.

[0069] Compared to the prior art, the present invention utilizes a single drive member 41 to drive two drive pins 42, causing the two drive pins 42 to respectively drive the traction members. The traction members' flexible extensibility allows the two traction members to extend to the rear wheel 3 and pull the pusher 412. The pusher 412 then drives the pusher 45 and the locking member 43 disposed near the rear wheel 3, causing the two locking members 43 to respectively lock the rear wheel 3 on the same side. Therefore, the user only needs to step on a single drive member 41 to simultaneously lock both rear wheels 3, achieving a one-step dual-brake function with a simple structure and convenient operation. Furthermore, by making the wheel seat 31 universally rotatable relative to the frame 1, the stroller 100 can move laterally, thus providing drifting capability. Furthermore, by using the wheel assembly orientation mechanism 5 to lock or unlock the wheel seat 31, the drifting or non-drifting function can be switched at any time, greatly improving convenience and flexibility.

[0070] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A baby stroller, characterized in that: The baby stroller comprises: Frame; a pair of front wheels; a pair of rear wheels; a pair of wheel seats, the pair of rear wheels are pivotally connected to the pair of wheel seats respectively, and the wheel seats are universally rotatably arranged on the vehicle frame; and A wheel brake mechanism is provided on the frame and can lock both rear wheels simultaneously to prevent the rear wheels from rolling. Wherein, the wheel brake mechanism includes a driving member and a brake assembly, and the brake assembly includes a driving pin, a traction member, a pushing member, a pushing member and a locking member, the driving pin is connected to one end of the traction member, and the other end of the traction member is connected to the pushing member, and the pushing member is movably arranged in the wheel seat of the stroller; the pushing member is movably arranged in the pushing member, and the pushing member is connected to the locking member, and the driving member drives the driving pin of the brake assembly to move, so as to drive the pushing member to move through the traction member, and then the pushing member drives the locking member to move, so as to lock or release the wheel. The driving member is a sleeve-shaped structure and is rotatably sleeved on the crossbar of the baby carriage frame, and the pushing member is movably arranged in each wheel seat. The traction members include a pair of first traction members and a pair of second traction members, one end of each of the first traction members is connected to the driving pin, the other end of each of the first traction members is rotatably connected to one end of each of the second traction members, and the other end of each of the second traction members is connected to the pushing member. The first traction member is provided with a connecting head, the second traction member has a pivot joint, and a receiving portion is provided between the first traction member and the second traction member. The connecting head is arranged in the receiving portion, and the pivot joint is rotatably arranged in the receiving portion to connect the first traction member with the second traction member.

2. The baby stroller according to claim 1, wherein: There are two brake assemblies, and the driving member drives the driving pins of the two brake assemblies to move simultaneously.

3. The baby stroller according to claim 1, wherein: The pushing member is provided with an inclined groove, and the pushing member is provided with a movable pin. The movable pin is movably inserted into the inclined groove so that the pushing member moves closer to or away from the axis direction of the wheel.

4. The baby stroller according to claim 3, wherein: The locking member is partially sleeved in the pushing member. When the movable pin moves in the inclined groove, the locking member moves closer to or farther away from the axis of the wheel along with the pushing member.

5. The baby stroller according to claim 4, wherein: The locking member is movably connected to the pushing member, and a reset member is provided between the locking member and the pushing member.

6. The baby stroller according to claim 1, wherein: A pair of driving bevel grooves are symmetrically provided on the driving member, and a driving shaft is provided on the outside of the driving pin perpendicular to its own central axis. The driving shaft is movably inserted into the driving bevel groove to drive the driving pin to move through the driving bevel groove when the driving member rotates.

7. The baby stroller according to claim 1, wherein: It also includes an elastic member, which is arranged between the two driving pins.

8. The baby stroller according to claim 1, wherein: The pushing member is provided with an accommodating protrusion, and the second pulling member has a pivot joint, which is arranged in the accommodating protrusion to connect the pushing member and the second pulling member.

9. The baby stroller according to claim 1, wherein: The pivot joint is a spherical head.

10. The baby stroller according to claim 1, wherein: The wheel set brake mechanism further comprises a rear leg tube, which is arranged on the frame of the baby carriage, the wheel seat is rotatably sleeved on the rear leg tube, and the accommodating portion is arranged in the rear leg tube.

11. The baby stroller according to claim 10, wherein: The wheel brake mechanism also includes a first sleeve and a second sleeve, the first sleeve is fixed in the rear leg tube, the second sleeve is built into the rear leg tube and is rotatably connected to the first sleeve; an internal space is enclosed between the first sleeve and the second sleeve for the first traction member and the second traction member to pass through, and the accommodating portion is located in the internal space.

12. The baby stroller according to claim 1, wherein: The wheelset brake mechanism further includes an elastic reset member, which provides an elastic force to reset the pushing member.

13. The baby stroller according to claim 1, wherein: The wheel hub is provided with engaging holes distributed around the rolling axis of the wheel, the openings of the engaging holes are facing outwards, and the locking member can enter the engaging holes to lock the wheel or exit the engaging holes to release the wheel.

14. The baby stroller according to claim 1, wherein: The driving member extends into a pedal for being stepped on.

15. The baby stroller according to claim 14, wherein: A locking assembly is provided between the driving member and the frame to lock or unlock the driving member.

16. The baby stroller according to claim 15, wherein: The locking assembly includes a locking pin provided on the driving member and two locking recesses provided on the frame. When the driving member rotates to a position for locking the wheel, the locking pin cooperates with one of the locking recesses to position the driving member; when the driving member rotates to a position for releasing the wheel, the locking pin cooperates with the other locking recess to position the driving member.

17. The baby stroller according to claim 16, wherein: The locking pin is movably arranged on the driving member. The locking assembly further includes a compression spring, which is arranged between the locking pin and the driving member to drive the locking pin to extend.

18. The baby stroller according to claim 16, wherein: A guide groove is also provided on one side of the driving member, and the guide groove is arranged between the two locking recesses. When the driving member rotates and releases the wheel, the locking pin slides along the guide groove toward the other locking recess. When the driving member rotates and locks the wheel, the locking pin slides along the guide groove toward one of the locking recesses.

19. The baby stroller according to claim 1, wherein: The baby carriage further comprises a wheel set orientation mechanism, which simultaneously limits the two wheel seats to prohibit the universal rotation of the wheel seats, or simultaneously releases the limits to allow the universal rotation of the wheel seats.

20. The baby stroller according to claim 19, wherein: The wheel set orientation mechanism includes an operating part, a third traction member, a positioning pin and a return spring. The operating part is connected to one end of the third traction member, and the other end of the third traction member is connected to the positioning pin. The return spring provides an elastic force to reset the positioning pin. The positioning pin can be inserted into the wheel seat and position the rear wheel or withdrawn from the wheel seat and release the rear wheel.

21. The baby stroller according to claim 20, wherein: The operating part is movably arranged on the frame of the baby carriage, and the operating part is symmetrically provided with two inclined slide grooves. The end of the third traction member is provided with a moving head, and the moving head is movably arranged on the frame and movably inserted into the inclined slide groove.

22. The baby stroller according to claim 19, wherein: A bearing is provided between the vehicle frame and the wheel seat.

23. The baby stroller according to claim 22, wherein: The frame is provided with a rear leg tube, the wheel seat is provided with a pivot sleeve pivotally connected to the rear leg tube, and the bearing is arranged between the pivot sleeve and the rear leg tube.

24. The baby stroller according to claim 23, wherein: The wall surface of the pivot sleeve that contacts the outer wall of the bearing has a tooth-like structure in the circumferential direction.

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