A wheel orientation and brake locking mechanism driven by a traction wire

Abstract

The present invention discloses a wheel orientation and brake locking mechanism driven by a traction wire, which includes a frame connecting cross bar and frame connectors installed at its left and right ends. A traction wheel, a brake handle positioning member, a brake handle, a brake handle return torsion spring and a brake handle return member are arranged on the frame connecting cross bar. An orientation return compression spring, an orientation pin, a brake transmission member return compression spring and a brake transmission member are arranged in each of the two frame connectors. An orientation traction wire is connected between the traction wheel and the orientation pin, and a brake handle traction wire is connected between the two brake transmission members. The brake handle traction wire passes under the brake handle. A brake handle return member compression spring is arranged between the brake handle and the brake handle return member. A brake handle positioning compression spring and a brake handle positioning pin are arranged in the brake handle positioning member, and a brake handle return pin is arranged in the brake handle. The present invention can achieve the simultaneous control of the orientation and brake locking of the wheels by a main traction cable and the simultaneous braking and locking of two wheels by a brake handle. It has a simple structure, low cost and reliable performance, and is suitable for bidirectional baby strollers.

Description

Technical Field

[0001] The invention belongs to the field of baby strollers, and in particular relates to a wheel orientation and brake locking mechanism using a traction wire drive. Background Art

[0002] Nowadays, baby strollers that can be pushed in both directions are common in the market. Users can choose whether the baby faces the forward direction or the user when pushing the stroller. In order to meet the needs of two-way straight-line pushing, turning pushing and temporary parking, existing two-way strollers are usually equipped with wheel orientation and brake locking functions. However, most of the existing two-way strollers still have the following problems:

[0003] 1. The orientation mechanism and the brake locking mechanism are independent of each other and are controlled by their corresponding traction cables. Therefore, when it is necessary to release the orientation and brake of one pair of wheels, the orientation mechanism and the brake locking mechanism must be unlocked respectively, which not only has cumbersome operating steps but also complicated lines.

[0004] 2. Each wheel is equipped with a brake pedal. The two wheels in the same direction do not have a brake linkage function. When braking or releasing the brake, you must step on or lift the left and right brake pedals respectively.

[0005] 3. Both the directional mechanism and the brake locking mechanism have automatic switching functions. Especially on a stroller that is pushed forward, when the push rod changes direction, the directional and brake locks of the previous two wheels must be manually released. Summary of the invention

[0006] In view of the defects in the prior art, the present invention provides a wheel orientation and brake locking mechanism using a traction wire drive to solve the problems of complex orientation and brake locking mechanism structures and cumbersome orientation and brake locking switching operations in existing two-way strollers.

[0007] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A wheel orientation and brake locking mechanism using a traction wire transmission, comprising a frame connecting crossbar and frame joints installed at the left and right ends of the frame connecting crossbar, a rotatable traction wheel is arranged on the frame connecting crossbar, the traction wheel is connected to a traction cable, and the traction wheel can realize forward and reverse rotation by traction or release of the traction cable;

[0009] Inside the left and right frame joints, there is a horizontally telescopic positioning pin respectively arranged through corresponding directional reset compression springs. The positioning pins are used for plug-in and mating with the positioning pin slots on the push wheel fork. The left and right positioning pins are respectively connected to the towing wheel through the left and right towing wires. The towing wheel controls the left and right towing wires in the same direction to perform traction or release actions simultaneously through its forward and reverse rotations. When the towing wire performs a traction action, the connected positioning pin retracts into the corresponding frame joint under the traction of the towing wire. When the towing wire performs a release action, the connected positioning pin extends out of the outer side of the lower part of the corresponding frame joint under the elastic force of the corresponding directional reset compression spring;

[0010] Inside the left and right frame joints, there is a vertically telescopic brake transmission part respectively arranged through corresponding brake transmission part reset compression springs. The brake transmission part is used to push and trigger the brake assembly on the push wheel fork. Between the left and right brake transmission parts, a brake handle towing wire is connected through several guide wheels. The brake handle towing wire is connected to a 5-brake handle. The brake handle is respectively rotatably and resetably arranged on the frame connection cross bar through a brake handle reset torsion spring. The brake handle towing wire passes through the through hole at the lower part of the brake handle; when the brake handle is stressed, the brake handle drives the brake handle reset torsion spring to be tightened and rotates downward to press the brake handle towing wire. When the brake handle is not stressed, the brake handle is lifted upward under the elastic force of the brake handle reset torsion spring and does not press the brake handle towing wire; the brake handle controls the brake handle towing wire to perform traction or release actions through its upward or downward movement. When the brake handle towing wire performs a traction action, the left and right brake transmission parts connected to it simultaneously extend out of the lower sides of their corresponding frame joints under the traction of the brake handle towing wire. When the brake handle towing wire performs a release action, the left and right brake transmission parts connected to it simultaneously retract into the corresponding frame joints under the elastic force of the corresponding brake transmission part reset compression springs.

[0011] A brake handle positioning piece is arranged between the traction wheel and the brake handle, and the brake handle positioning piece is fixedly connected to the frame connecting cross bar, and a horizontally retractable brake handle positioning pin is arranged inside the brake handle positioning piece through a brake handle positioning compression spring, and the brake handle positioning pin is transmission-connected to the traction wheel through a brake handle positioning traction wire, and the traction wheel controls the brake handle positioning traction wire to perform traction or release action through its own forward and reverse rotation, and when the brake handle positioning traction wire performs traction action, the brake handle positioning pin connected thereto is retracted into the corresponding brake position under the traction of the brake handle positioning traction wire. Inside the handle positioning member, when the brake handle positioning wire is released, the brake handle positioning pin connected thereto extends out of the outer side surface of the corresponding brake handle positioning member under the elastic force of the corresponding brake handle positioning compression spring; at the same time, a protruding brake handle positioning block is provided on the top of the brake handle, and a brake handle positioning hole is provided on the brake handle positioning block, which horizontally penetrates the left and right surfaces of the brake handle positioning block. When the brake handle is pressed downward, the inner side opening of the brake handle positioning hole rotates downward to align with the protruding part of the brake handle positioning pin, so that the brake handle positioning pin extends into the brake handle positioning hole;

[0012] A brake handle reset piece is attached to the bottom of the brake handle, and the brake handle reset piece is rotatably arranged on the frame connecting cross bar. The brake handle reset piece rotates synchronously with the brake handle through the brake handle reset torsion spring, and the top of the brake handle reset piece has a protruding brake handle reset piece contact portion that extends upward from the upper surface of the brake handle; a brake handle reset piece compression spring is connected between the brake handle reset piece and the brake handle, and at the same time, a horizontally movable brake handle reset pin is arranged in the brake handle positioning hole of the brake handle, and when the brake handle positioning pin extends into the inner hole of the brake handle positioning hole, the brake handle positioning pin contacts one end of the brake handle reset pin and pushes the other end of the brake handle out of the outer hole of the brake handle positioning hole. Mouth; when the brake handle reset member is in the initial state relative to the brake handle at this time, the brake handle reset member opens downward under the elastic force of the brake handle reset member compression spring, and the brake handle reset member contact portion of the brake handle reset member does not apply force to the brake handle reset pin; when the brake handle reset member is in a clamped state relative to the brake handle at this time, the brake handle reset member presses the brake handle reset member compression spring and lifts upward, and the brake handle reset member drives the brake handle reset member contact portion to push the brake handle reset pin back into the brake handle positioning hole, and the brake handle reset pin then pushes the brake handle positioning pin back into the brake handle positioning member, and the brake handle is lifted upward under the elastic force of the brake handle reset torsion spring without compressing the brake handle pulling wire.

[0013] Furthermore, the top end of the brake transmission member extends out of the upper surface of the frame joint to avoid interference with the travel of the brake transmission member.

[0014] Furthermore, an upper cover plate and a lower cover plate are commonly provided on the frame joint and the frame connecting cross bar.

[0015] Further, a traction cable tension adjustment block is provided on the upper surface of the brake lever positioning member, and one end of the traction cable is in tension transmission connection with the traction wheel through the traction cable tension adjustment block.

[0016] Further, the traction wheel is located in the middle of the cross bar connecting the vehicle frames.

[0017] Further, a traction cable groove, a left-side directional traction wire groove, a right-side directional traction wire groove, and a brake lever positioning traction wire groove are circumferentially provided on the circumferential surface of the traction wheel, and traction cable fixing card slots, left-side directional traction wire fixing card slots, right-side directional traction wire fixing card slots, and brake lever positioning traction wire fixing card slots are respectively provided at the ends of the traction cable groove, the left-side directional traction wire groove, the right-side directional traction wire groove, and the brake lever positioning traction wire groove; the traction cable passes through the traction cable groove and is fixedly connected to the traction cable fixing card slot, the left-side directional traction wire on the left side is fixedly connected through the left-side directional traction wire groove and the left-side directional traction wire fixing card slot, the right-side directional traction wire on the right side is fixedly connected through the right-side directional traction wire groove and the right-side directional traction wire fixing card slot, and the brake lever positioning traction wire is fixedly connected through the brake lever positioning traction wire groove and the brake lever positioning traction wire fixing card slot.

[0018] Further, after the traction cable is introduced from the vehicle frame joint on the right side, it is fixedly connected to the traction cable fixing card slot on the traction wheel, and both the brake lever and the brake lever reset member are located on the right side of the traction wheel.

[0019] Further, the traction cable fixing card slot is located on the left side at the top of the traction wheel, the left-side directional traction wire fixing card slot is located on the right side at the top of the traction wheel, the right-side directional traction wire fixing card slot is located on the left side at the bottom of the traction wheel, and the brake lever positioning traction wire fixing card slot is located on the right side at the bottom of the traction wheel.

[0020] Further, one end of the brake lever return pin in contact with the contact part of the brake lever return member is semi-spherical, the width of the lower half of the contact part of the brake lever return member is greater than the width of the upper half thereof, and the width of the lower half of the contact part of the brake lever return member gradually increases from top to bottom, so that the contact part of the brake lever return member can smoothly push the brake lever return pin into the brake lever positioning hole.

[0021] Further, anti-slip grooves for increasing friction are provided on the upper surface of the brake lever.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention not only realizes the control of a set of orientation and brake locking mechanisms by a single main traction cable, but also realizes the control of the brakes of a pair of wheels by a single brake handle, achieving one-step double braking. That is, when the main traction cable performs a traction action, the orientation and brake locking of the two wheels are automatically released simultaneously, and the two wheels can freely turn and rotate. When the main traction cable performs a release action, the orientation locking and brake pending locking of the two wheels are automatically activated simultaneously. At this stage, the two wheels can only rotate in the front and rear directions. If the rear brake handle is further depressed, the two wheels are simultaneously and actively switched from brake pending locking to brake locking. At this stage, the two wheels can neither rotate nor change direction, and the brake handle will be locked until the traction cable switches to the traction action or the brake handle reset part is manually activated to unlock the brake handle locking.

[0024] 2. The present invention can achieve that when the push rod assembly changes direction to one direction, the brake handle in the opposite direction can never be locked, thereby preventing the accidental stepping on by the person in front during pushing and avoiding causing pushing obstacles.

[0025] 3. The structure of the present invention is relatively simple, the circuit is concise, the performance is reliable, the safety is high, and the manufacturing cost is low. Most importantly, the structural design is optimized, and the operation steps for switching the wheel orientation and brake locking are simplified, which is very suitable for baby strollers with two-way pushing.

[0026] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following is a detailed description of the preferred embodiment of the present invention in conjunction with the accompanying drawings. The specific implementation manner of the present invention is given in detail by the following embodiments and their accompanying drawings. Brief Description of the Drawings

[0027] The drawings described herein are used to provide a further understanding of the present invention, and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0028] Figure 1 is a perspective view of the present invention;

[0029] Figure 2 is a top view of the present invention;

[0030] Figure 3 is a front half-sectional view of the orientation locking assembly in the present invention;

[0031] Figure 4 is a front half-sectional view of the brake locking assembly and the brake assembly in the present invention;

[0032] Figure 5 is an enlarged front sectional view of the brake locking assembly in the present invention;

[0033] Figure 6 Top enlarged sectional view of the brake locking assembly in the present invention;

[0034] Figure 7 Side half-sectional view of the brake locking assembly in the present invention;

[0035] Figure 8 Stereogram of the traction wheel of the present invention;

[0036] Figure 9 Assembly relationship diagram of the traction wheel, directional traction wire and traction cable of the present invention;

[0037] Figure 10 Assembly relationship diagram of the traction wheel and the brake lever positioning traction wire of the present invention. Detailed implementation manners

[0038] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments. The descriptions made herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0039] See Figure 1-2 As shown, a wheel orientation and brake locking mechanism driven by a traction wire includes a frame connection cross bar 6 and frame joints 3 installed at the left and right ends of the frame connection cross bar 6. A rotatable traction wheel 10 is provided on the frame connection cross bar 6. The traction wheel 10 is in driving connection with a traction cable 42, and the traction wheel 10 realizes forward and reverse rotation through the traction or release of the traction cable 42;

[0040] See Figure 3 As shown, a horizontally telescopic orientation pin 8 is respectively provided inside the left and right frame joints 3 through corresponding orientation return compression springs 7. The orientation pin 8 is used for plug-in cooperation with the orientation pin slot 27 on the push wheel fork. The left and right orientation pins 8 are respectively in driving connection with the traction wheel 10 through the left and right orientation traction wires 9. The traction wheel 10 controls the left and right orientation traction wires 9 in the same direction to perform traction or release actions simultaneously through its own forward and reverse rotation. When the orientation traction wire 9 performs a traction action, the connected orientation pin 8 retracts into the corresponding frame joint 3 under the traction of the orientation traction wire 9. When the orientation traction wire 9 performs a release action, the connected orientation pin 8 extends out of the outer side of the lower part of the corresponding frame joint 3 under the elastic force of the corresponding orientation return compression spring 7;

[0041] See Figures 4-7As shown in the figure, inside the left and right frame joints 3, there is respectively a vertically telescopic brake transmission member 12 arranged through a corresponding brake transmission member return spring 11. The brake transmission member 12 is used to push and trigger the brake assembly on the push wheel fork. Between the left and right brake transmission members 12, a brake lever traction wire 14 is connected by a number of guide wheels 13. The brake lever traction wire 14 is in transmission connection with a brake lever 15. The brake lever 15 is rotatably and resetably arranged on the frame connection cross bar 6 through a brake lever return torsion spring 16. The brake lever traction wire 14 passes through the through hole at the lower part of the brake lever 15. When the brake lever 15 is stressed, the brake lever 15 drives the brake lever return torsion spring 16 to be tightened and rotates downward to press the brake lever traction wire 14. When the brake lever 15 is not stressed, the brake lever 15 is lifted upward under the elastic force of the brake lever return torsion spring 16 and does not press the brake lever traction wire 14. The brake lever 15 controls the brake lever traction wire 14 to perform a traction or release action through its own upward or downward movement. When the brake lever traction wire 14 performs a traction action, the left and right brake transmission members 12 connected thereto simultaneously extend out of the lower side surfaces of their corresponding frame joints 3 under the traction of the brake lever traction wire 14. When the brake lever traction wire 14 performs a release action, the left and right brake transmission members 12 connected thereto simultaneously retract into their corresponding frame joints 3 under the elastic force of the corresponding brake transmission member return springs 11.

[0042] A brake lever positioning member 17 is arranged between the traction wheel 10 and the brake lever 15. The brake lever positioning member 17 is fixedly connected to the frame connection cross bar 6. Inside the brake lever positioning member 17, a horizontally telescopic brake lever positioning pin 19 is arranged through a brake lever positioning compression spring 18. The brake lever positioning pin 19 is in transmission connection with the traction wheel 10 through a brake lever positioning traction wire 20. The traction wheel 10 controls the brake lever positioning traction wire 20 to perform a traction or release action through its own forward and reverse rotation. When the brake lever positioning traction wire 20 performs a traction action, the connected brake lever positioning pin 19 retracts into the corresponding brake lever positioning member 17 under the traction of the brake lever positioning traction wire 20. When the brake lever positioning traction wire 20 performs a release action, the connected brake lever positioning pin 19 extends out of the outer side surface of the corresponding brake lever positioning member 17 under the elastic force of the corresponding brake lever positioning compression spring 18. At the same time, a protruding brake lever positioning block 21 is arranged at the top of the brake lever 15. A brake lever positioning hole 22 horizontally penetrating the left and right surfaces of the brake lever positioning block 21 is arranged on the brake lever positioning block 21. When the brake lever 15 is stressed and pressed downward, the inner hole opening of the brake lever positioning hole 22 rotates downward to align with the protruding part of the brake lever positioning pin 19 so that the brake lever positioning pin 19 extends into the brake lever positioning hole 22.

[0043] A brake lever return member 23 is attached to the underside of the brake lever 15. The brake lever return member 23 is rotatably disposed on the frame connecting cross bar 6. The brake lever return member 23 rotates synchronously with the brake lever 15 via the brake lever return torsion spring 16. A protruding brake lever return member contact portion 25 at the top of the brake lever return member 23 extends upward beyond the upper surface of the brake lever 15. A brake lever return member compression spring 24 is connected between the brake lever return member 23 and the brake lever 15. At the same time, a horizontally movable brake lever return pin 26 is disposed in the brake lever positioning hole 22 of the brake lever 15. When the brake lever positioning pin 19 extends into the inner orifice of the brake lever positioning hole 22, the brake lever positioning pin 19 contacts one end of the brake lever return pin 26 and pushes the other end out of the outer orifice of the brake lever positioning hole 22. When the brake lever return member 23 is in an initial state relative to the brake lever 15 at this time, the brake lever return member 23 opens downward under the elastic force of the brake lever return member compression spring 24, and the brake lever return member contact portion 25 of the brake lever return member 23 does not exert force on the brake lever return pin 26. When the brake lever return member 23 is in a clamped state relative to the brake lever 15 at this time, the brake lever return member 23 compresses the brake lever return member compression spring 24 and lifts upward, and the brake lever return member 23 drives the brake lever return member contact portion 25 to push the brake lever return pin 26 back into the brake lever positioning hole 22. The brake lever return pin 26 then pushes the brake lever positioning pin 19 back into the brake lever positioning member 17. The brake lever 15 lifts upward under the elastic force of the brake lever return torsion spring 16 and does not press on the brake lever traction wire 14.

[0044] Further, as shown in Figures 1-4 The top end of the brake transmission member 12 extends beyond the upper surface of the frame joint 3 to avoid interfering with the stroke of the brake transmission member 12.

[0045] Further, an upper cover plate and a lower cover plate are jointly provided on the frame joint 3 and the frame connecting cross bar 6.

[0046] Further, as shown in Figures 1-5 A traction cable tension adjustment block 44 is provided on the upper surface of the brake lever positioning member 17. One end of the traction cable 42 is in tensioned driving connection with the traction wheel 10 via the traction cable tension adjustment block 44.

[0047] Further, the traction wheel 10 is located at the middle of the frame connecting cross bar 6.

[0048] Further, as shown in Figures 8-10As shown in the figure, a traction cable groove 45, a left-side directional traction wire groove 46, a right-side directional traction wire groove 47, and a brake lever positioning traction wire groove 48 are circumferentially arranged on the circumferential surface of the traction wheel 10. The ends of the traction cable groove 45, the left-side directional traction wire groove 46, the right-side directional traction wire groove 47, and the brake lever positioning traction wire groove 48 are respectively provided with a traction cable fixing card slot 49, a left-side directional traction wire fixing card slot 50, a right-side directional traction wire fixing card slot 51, and a brake lever positioning traction wire fixing card slot 52. The traction cable 42 passes through the traction cable groove 45 and is fixedly connected to the traction cable fixing card slot 49. The left-side directional traction wire is fixedly connected through the left-side directional traction wire groove 46 and the left-side directional traction wire fixing card slot 50. The right-side directional traction wire 9 passes through the right-side directional traction wire groove 47 and is fixedly connected to the right-side directional traction wire fixing card slot 51. The brake lever positioning traction wire 20 passes through the brake lever positioning traction wire groove 48 and is fixedly connected to the brake lever positioning traction wire fixing card slot 52.

[0049] Further, after being introduced from the right-side frame joint 3, the traction cable 42 is fixedly connected to the traction cable fixing card slot 49 on the traction wheel 10. Both the brake lever 15 and the brake lever return member 23 are located on the right side of the traction wheel 10.

[0050] Further, the traction cable fixing card slot 49 is located on the left side at the top of the traction wheel 10. The left-side directional traction wire fixing card slot 50 is located on the right side at the top of the traction wheel 10. The right-side directional traction wire fixing card slot 51 is located on the left side at the bottom of the traction wheel 10. The brake lever positioning traction wire fixing card slot 52 is located on the right side at the bottom of the traction wheel 10.

[0051] Further, as shown in Figure 2 and 4 As shown in the figure, one end of the brake lever return pin 26 in contact with the contact part 25 of the brake lever return member is semi-spherical. The width of the lower half of the contact part 25 of the brake lever return member is greater than the width of its upper half, and the width of the lower half of the contact part 25 of the brake lever return member gradually increases from top to bottom, so that the contact part 25 of the brake lever return member can smoothly push the brake lever return pin 26 into the brake lever positioning hole 22.

[0052] Further, as shown in Figure 1-2 As shown in the figure, an anti-slip groove 55 for increasing friction is provided on the upper surface of the brake lever 15.

[0053] Next, the working principle of the present invention will be described in detail:

[0054] The traction wheel 10 is the core component of this mechanism. The traction wheel 10 is controlled by a traction cable 42. By pulling or releasing the traction cable 42, forward and reverse rotation of the traction wheel 10 can be achieved.

[0055] When the traction cable 42 performs a traction action, it drives the traction wheel 10 to rotate forward. As the traction wheel 10 rotates forward, it simultaneously drives the left and right directional traction wires 9 and the brake handle positioning traction wire 20 to perform traction actions. On the one hand, the left and right directional traction wires 9 respectively pull the left and right directional pins 8 into the corresponding frame joints 3, causing the left and right directional return compression springs 7 at the front and rear to be compressed. At this time, the left and right directional pins 8 do not work. That is to say, when this mechanism is assembled onto the connecting crossbar of the trolley frame, the left and right directional pins 8 at this time do not engage with the directional pin slots on the left and right wheel forks, enabling the two wheels to be in a directional unlocking state. On the other hand, the brake handle positioning traction wire 20 pulls the connected brake handle positioning pin 19 into the brake handle positioning member 17, causing the brake handle positioning compression spring 18 to be compressed, and causing the brake handle positioning pin 19 to lose the ability to lock the brake handle 15. The brake handle 15, under the elastic force of the brake handle return torsion spring 16, simultaneously drives the brake handle return member 23 to lift upward. At this time, the brake lock is in a failure state, and no matter how the user steps on the brake handle 15, it will not cause the brake lock of the brake handle 15.

[0056] In the case where the brake lock is in a failure state, since the brake handle 15 is lifted, the brake handle traction wire 14 is not oppressed and performs a release action. The left and right brake transmission members 12 connected to the brake handle traction wire 14 simultaneously retract into the left and right frame joints 3 under the elastic force of the left and right brake transmission member return compression springs 11. At this time, the left and right brake transmission members 12 do not squeeze the brake return members 31 on the left and right wheel forks, that is, the left and right brake transmission members 12 do not work. That is to say, when this mechanism is assembled onto the connecting crossbar of the trolley frame, the left and right brake transmission members 12 at this time will not squeeze the brake components on the left and right wheel forks downward, that is, they will not trigger the brakes of the left and right wheels.

[0057] When the traction rope 42 is released, the traction wheel 10 is driven to rotate in the opposite direction. The traction wheel 10 drives the left and right directional traction wires 9 and the brake handle positioning traction wire 20 to release as it rotates in the opposite direction. On the one hand, the left and right directional pins 8 connected to the left and right directional traction wires 9 extend outward from the outer side surfaces of the lower parts of the left and right frame joints 3 under the elastic force of the left and right directional reset compression springs 7. At this time, the left and right directional pins 8 work, that is, when the mechanism is assembled on the cart frame connecting cross bar, the left and right directional pins 8 can be plugged into the directional pin slots on the left and right wheel forks, so that the two wheels are in a directional locking state; on the other hand, the brake handle positioning pin 19 connected to the brake handle positioning traction wire 20 extends out from the outer side surface of the brake handle positioning member 17 under the elastic force of the brake handle positioning compression spring 18, so that the brake handle positioning pin 19 has the ability to lock the brake handle 15. At this time, the user only needs to step on the brake handle 15 to achieve the brake and brake locking of the rear wheel.

[0058] In the case where the brake handle positioning pin 19 has the ability to lock the brake handle 15, when the brake handle 15 is still in the lifted state, the brake handle positioning pin 19 is offset from the brake handle positioning hole 22 on the brake handle 15, and the brake handle positioning pin 19 is still pressed by the inner surface of the brake handle 15 in the brake handle reset member 23, that is, it is in the brake waiting to lock state. When the brake handle 15 is stepped on, the brake handle reset member 23 rotates downward together, and the inner side opening of the brake handle positioning hole 22 on the brake handle 15 rotates downward to align with the brake handle positioning pin 19. At this time, the brake handle positioning pin 19 can extend into the brake handle positioning hole 22 on the brake handle 15 under the elastic force of the brake handle positioning compression spring 18, thereby achieving the brake locking of the brake handle 15. Under the premise of not changing the state of the traction rope 42 or not lifting the brake handle reset member 23, the brake handle 15 can never be unlocked.

[0059] After the brake handle positioning pin 19 extends into the brake handle positioning hole 22 on the brake handle 15, it contacts one end of the brake handle reset pin 26 in the brake handle positioning hole 22 and pushes the other end out of the outer opening of the brake handle positioning hole 22, thereby providing a contact point for manual unlocking for the brake handle reset member 23. When the brake handle reset member 23 is not lifted, the brake handle reset member 23 is in an initial state relative to the brake handle 15. At this time, the brake handle reset member 23 opens downward under the elastic force of the brake handle reset member compression spring 24, so that the brake handle reset member contact portion 25 on the brake handle reset member 23 does not apply force to the protruding end of the brake handle reset pin 26. When the user needs to unlock the rear wheel brake in advance, the user kicks the brake reset member 31 upward with the toes, so that the brake handle reset member 23 is clamped relative to the brake handle 15. At this time, the brake handle reset member 23 is lifted upward and the brake handle reset member compression spring 24 is compressed, so that the brake handle reset member 23 drives the brake handle reset member contact portion 25 thereon to push the brake handle reset pin 26 back into the brake handle positioning hole 22, and then continues to push the brake handle positioning pin 19 out of the brake handle positioning hole 22 and back into the brake handle positioning member 17. The brake handle 15 is lifted upward together with the brake handle reset member 23 under the elastic force of the brake handle reset torsion spring 16, and the brake handle positioning pin 19 is staggered again with the brake handle positioning hole 22 on the brake handle 15, thereby realizing manual unlocking of the brake lock. Since the brake handle positioning wire 20 is still in the released state at this time, the brake handle positioning pin 19 still has the ability to lock the brake handle 15, that is, it is in the waiting brake locking state, and the rear wheel brake can be locked again by stepping on the brake handle 15 again.

[0060] When the brake handle 15 is simply pressed down or locked after being pressed down, the brake handle wire 14 is pressed downward and performs a pulling action due to the downward rotation of the brake handle 15. The left and right brake transmission members 12 connected to the brake handle wire 14 are pulled and extend out of the lower side of the left and right frame joints 3. At this time, the left and right brake transmission members 12 work, that is, when the mechanism is assembled on the cart frame connecting crossbar, the left and right brake transmission members 12 can respectively press the brake components on the left and right wheel forks downward, thereby triggering the brakes of the left and right wheels.

[0061] In summary, the technical effects that can be achieved by the present invention are as follows: when the traction cable is pulled, the forward rotation of the traction wheel can be driven, and thus the directional locking and braking locking of the two wheels can be automatically released, and the two wheels can freely turn and rotate. When the traction cable is released, the reverse rotation of the traction wheel can be driven, and thus the two wheels will automatically activate the directional locking and braking waiting for locking. At this stage, the two wheels can only roll in the front and rear directions. If the brake handle is further depressed, the two wheels will switch from braking waiting for locking to braking locking. At this stage, the two wheels can neither turn nor roll, and at the same time, the brake handle will be locked until the traction cable is pulled or the brake handle reset part is manually activated to unlock the brake handle locking.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wheel orientation and brake locking mechanism driven by a traction wire, characterized in that: It includes a frame connecting cross bar (6) and frame connectors (3) installed at the left and right ends of the frame connecting cross bar (6). A rotatable towing wheel (10) is arranged on the frame connecting cross bar (6). The towing wheel (10) is in driving connection with a towing cable (42). The towing wheel (10) realizes forward and reverse rotation through the traction or release of the towing cable (42). Inside the left and right frame connectors (3), a horizontally telescopic positioning pin (8) is respectively arranged through corresponding directional reset compression springs (7). The positioning pin (8) is used for plug-in fit with a positioning pin slot (27) on the wheel fork of the push wheel. The left and right positioning pins (8) are respectively in driving connection with the towing wheel (10) through left and right directional towing wires (9). The towing wheel (10) controls the left and right directional towing wires (9) in the same direction to perform traction or release actions simultaneously through its own forward and reverse rotation. When the directional towing wire (9) performs a traction action, the connected positioning pin (8) retracts into the corresponding frame connector (3) under the traction of the directional towing wire (9). When the directional towing wire (9) performs a release action, the connected positioning pin (8) extends out of the outer side of the lower part of the corresponding frame connector (3) under the elastic force of the corresponding directional reset compression spring (7). Inside the left and right frame connectors (3), a vertically telescopic brake transmission part (12) is respectively arranged through corresponding brake transmission part reset compression springs (11). The brake transmission part (12) is used to push and trigger a brake assembly on the wheel fork of the push wheel. A brake handle towing wire (14) is connected between the left and right brake transmission parts (12) through a plurality of guide wheels (13). The brake handle towing wire (14) is in driving connection with a brake handle (15). The brake handle (15) is rotatably and resetably arranged on the frame connecting cross bar (6) through a brake handle reset torsion spring (16). The brake handle towing wire (14) passes through a through hole at the lower part of the brake handle (15). When the brake handle (15) is stressed, the brake handle (15) drives the brake handle reset torsion spring (16) to be tightened and rotates downward to press the brake handle towing wire (14). When the brake handle (15) is not stressed, the brake handle (15) is lifted upward under the elastic force of the brake handle reset torsion spring (16) and does not press the brake handle towing wire (14). The brake handle (15) controls the brake handle towing wire (14) to perform traction or release actions through its own upward or downward movement. When the brake handle towing wire (14) performs a traction action, the left and right brake transmission parts (12) connected thereto extend out of the lower sides of their corresponding frame connectors (3) under the traction of the brake handle towing wire (14). When the brake handle towing wire (14) performs a release action, the left and right brake transmission parts (12) connected thereto retract into their corresponding frame connectors (3) simultaneously under the elastic force of the corresponding brake transmission part reset compression springs (11).A brake handle positioning member (17) is provided between the traction wheel (10) and the brake handle (15), and the brake handle positioning member (17) is fixedly connected to the frame connecting cross bar (6). A brake handle positioning pin (19) which can be horizontally retracted is provided inside the brake handle positioning member (17) via a brake handle positioning compression spring (18). The brake handle positioning pin (19) is transmission-connected to the traction wheel (10) via a brake handle positioning traction wire (20). The traction wheel (10) controls the brake handle positioning traction wire (20) to perform traction or release action through its own forward and reverse rotation. When the brake handle positioning traction wire (20) performs traction action, the brake handle positioning pin (19) connected thereto is retracted into a corresponding position under the traction of the brake handle positioning traction wire (20). The brake handle positioning member (17) is located inside the brake handle positioning wire (20), and when the brake handle positioning wire (20) is released, the brake handle positioning pin (19) connected thereto extends out of the outer side surface of the corresponding brake handle positioning member (17) under the elastic force of the corresponding brake handle positioning compression spring (18); at the same time, a protruding brake handle positioning block (21) is provided on the top of the brake handle (15), and a brake handle positioning hole (22) is provided on the brake handle positioning block (21) which horizontally passes through the left and right surfaces of the brake handle positioning block (21); when the brake handle (15) is pressed downward, the inner side opening of the brake handle positioning hole (22) rotates downward to align with the protruding portion of the brake handle positioning pin (19), so that the brake handle positioning pin (19) extends into the brake handle positioning hole (22); A brake handle reset member (23) is attached to the lower side of the brake handle (15), and the brake handle reset member (23) is rotatably arranged on the frame connecting cross bar (6). The brake handle reset member (23) rotates synchronously with the brake handle 2 (15) through the brake handle reset torsion spring (16), and a protruding brake handle reset member contact portion (25) is provided on the top of the brake handle reset member (23) and extends upward from the upper surface of the brake handle (15); a brake handle reset member compression spring (24) is connected between the brake handle reset member (23) and the brake handle (15), and at the same time, a brake handle positioning hole (22) of the brake handle (15) is provided with a brake handle reset member. A brake handle reset pin (26) that can be moved horizontally. When the brake handle positioning pin (19) extends into the inner opening of the brake handle positioning hole (22), the brake handle positioning pin (19) contacts one end of the brake handle reset pin (26) and pushes the other end of the brake handle reset pin (26) out of the outer opening of the brake handle positioning hole (22); when the brake handle reset member (23) is in an initial state relative to the brake handle (15) at this time, the brake handle reset member (23) opens downward under the elastic force of the brake handle reset member compression spring (24), and the brake handle reset member contact portion (25) of the brake handle reset member (23) does not apply force to the brake handle reset pin (26);When the brake lever reset member (23) is in a clamped state relative to the brake lever (15) at this time, the brake lever reset member (23) presses the brake lever reset spring (24) and lifts upward, and the brake lever reset member (23) drives the brake lever reset member contact portion (25) to push the brake lever reset pin (26) back into the brake lever positioning hole (22). Subsequently, the brake lever reset pin (26) pushes the brake lever positioning pin (19) back into the brake lever positioning member (17). The brake lever (15) is lifted upward under the elastic force of the brake lever return torsion spring (16) and does not press the brake lever traction wire (14).; 2. The wheel orientation and brake locking mechanism driven by a traction wire according to claim 1, characterized in that: The top end of the brake transmission part (12) extends out of the upper surface of the frame joint (3) to avoid interfering with the stroke of the brake transmission part (12).

3. The wheel orientation and brake locking mechanism driven by a traction wire according to claim 1, characterized in that: An upper cover plate and a lower cover plate are jointly arranged on the frame joint (3) and the frame connecting cross bar (6).

4. The wheel orientation and brake locking mechanism driven by a traction wire according to claim 1, characterized in that: A traction cable tension adjustment block (44) is arranged on the upper surface of the brake lever positioning part (17), and one end of the traction cable (42) is in tension transmission connection with the traction wheel (10) through the traction cable tension adjustment block (44).

5. The wheel orientation and braking locking mechanism driven by a traction wire according to claim 1, characterized in that: The traction wheel (10) is located in the middle of the frame connecting cross bar (6).

6. The wheel orientation and brake locking mechanism driven by a traction wire according to claim 1, characterized in that: The circumferential surface of the traction wheel (10) is circumferentially provided with a traction cable groove (45), a left-side directional traction wire groove (46), a right-side directional traction wire groove (47) and a brake lever positioning traction wire groove (48), and the ends of the traction cable groove (45), the left-side directional traction wire groove (46), the right-side directional traction wire groove (47) and the brake lever positioning traction wire groove (48) are respectively provided with a traction cable fixing clamping groove (49), a left-side directional traction wire fixing clamping groove (50), a right-side directional traction wire fixing clamping groove (51) and a brake lever positioning traction wire fixing clamping groove (52); the traction cable (42) passes through the traction cable groove (45) and is fixedly connected with the traction cable fixing clamping groove (49), the left-side directional traction wire is fixedly connected through the left-side directional traction wire groove (46) and the left-side directional traction wire fixing clamping groove (50), the right-side directional traction wire (9) is fixedly connected through the right-side directional traction wire groove (47) and the right-side directional traction wire fixing clamping groove (51), and the brake lever positioning traction wire (20) is fixedly connected through the brake lever positioning traction wire groove (48) and the brake lever positioning traction wire fixing clamping groove (52).

7. The wheel orientation and braking locking mechanism driven by a traction wire according to claim 6, characterized in that: The traction cable (42) is introduced from the right-side frame joint (3) and then fixedly connected with the traction cable fixing clamping groove (49) on the traction wheel (10), and both the brake lever (15) and the brake lever reset part (23) are located on the right side of the traction wheel (10).

8. The wheel orientation and braking locking mechanism driven by a traction wire according to claim 7, characterized in that: The traction cable fixing clamping groove (49) is located on the left side of the top of the traction wheel (10), the left-side directional traction wire fixing clamping groove (50) is located on the right side of the top of the traction wheel (10), the right-side directional traction wire fixing clamping groove (51) is located on the left side of the bottom of the traction wheel (10), and the brake lever positioning traction wire fixing clamping groove (52) is located on the right side of the bottom of the traction wheel (10).

9. The wheel orientation and brake locking mechanism driven by a traction wire according to claim 1, characterized in that: One end of the brake lever reset pin (26) in contact with the contact part (25) of the brake lever reset part is semi-spherical, the width of the lower half of the contact part (25) of the brake lever reset part is greater than the width of the upper half thereof, and the width of the lower half of the contact part (25) of the brake lever reset part gradually increases from top to bottom, so that the contact part (25) of the brake lever reset part can smoothly push the brake lever reset pin (26) into the brake lever positioning hole (22).

10. The wheel orientation and brake locking mechanism driven by a traction wire according to claim 1, characterized in that: The upper surface of the brake lever (15) is provided with an anti-slip groove (55) for increasing the friction force.

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