Double-pedal synchronous trundle with reset button

Abstract

The utility model relates to a double-pedal synchronous trundle with a reset button, which comprises a trundle frame body, a first rotating wheel rim and a second rotating wheel rim, the first rotating wheel rim and the second rotating wheel rim are rotatably connected to the front side and the rear side of the trundle frame body through hinge shafts, and the trundle frame body is rotatably connected with a first pedal and a second pedal. The first end of the first pedal extends out of the left side of the wheel carrier body, the first end of the second pedal extends out of the right side of the wheel carrier body, and the position, relatively close to the first end of the first pedal, of the first pedal is rotationally hinged to the first end of a first traction piece. The position, relatively close to the first end of the second pedal plate, of the second pedal plate is rotationally hinged to the first end of a second traction piece, and the second end of the first traction piece and the second end of the second traction piece are hinged to a guide block connected to the wheel frame body in a sliding mode. And the double-pedal synchronous trundle can be conveniently reset.

Description

Technical Field

[0001] This utility model relates to a dual-pedal synchronous caster with a reset button. Background Technology

[0002] Casters include swivel casters and fixed casters; swivel casters, also known as universal casters, have a structure that allows them to rotate 360 ​​degrees; fixed casters, also called directional casters, do not have a rotating structure and cannot rotate; usually, the two types of casters are used together, for example, the structure of a handcart has two directional casters at the front and two universal casters at the back near the push handle.

[0003] Casters typically require a brake pedal, but currently, the brake pedal is only located on one side of the caster. This makes it inconvenient to apply the brakes when the caster is tucked into the vehicle interior. To overcome this technical problem, the applicant applied for a "Dual-Pedal Synchronous Full Braking Caster" (No. CN102602241B) in 2012. This caster includes a main frame, with wheel pads and side covers sequentially arranged on both sides of the main frame. A crossbar is installed in the axle holes of the main frame and the wheel pads. The main frame also has a synchronous brake slider that can slide back and forth along a longitudinal groove. A return spring is installed between the upper end of the synchronous brake slider and the inner cavity of the main frame. Sector-shaped brake racks for braking the wheel pads are located on both sides of the synchronous brake slider. The slider is hollow and has a long slot in its middle for the crossbar to pass through. Two synchronous brake pedals facing opposite directions are fitted on the crossbar inside the synchronous brake slider. The two synchronous brake pedals are provided with cams for pushing the synchronous brake slider upward. A synchronous linkage mechanism is provided between the two synchronous brake pedals. The caster adopts a dual-pedal synchronous full braking design. Although it can achieve full freedom and full braking operation no matter which pedal is pressed, when it is necessary to reset the caster (i.e., unlock the caster), the user needs to insert their toes into the gap between the synchronous brake pedal and the ground and lift them upward to reset the caster. However, it is inconvenient for users to reset the caster in this way when wearing thick shoes or sitting on the vehicle. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a double-pedal synchronous caster with a reset button. The double-pedal synchronous caster with a reset button and its working method are reasonably designed, which is conducive to facilitating the reset action of the double-pedal synchronous caster.

[0005] This utility model relates to a dual-pedal synchronous caster with a reset button, characterized in that it includes a wheel frame and a first rotating wheel rim and a second rotating wheel rim rotatably connected to the front and rear sides of the wheel frame via hinge shafts. A first foot pedal and a second foot pedal are rotatably connected to the wheel frame. The first end of the first foot pedal extends out of the left side of the wheel frame, and the first end of the second foot pedal extends out of the right side of the wheel frame. The first foot pedal is rotatably hinged to the first end of a first tension plate at a position relatively close to its first end, and the second foot pedal is rotatably hinged to the first end of a second tension plate at a position relatively close to its first end. The two ends are hinged to guide blocks that are slidably connected to the wheel frame. The wheel frame is provided with a lifting seat that can be pushed up by the first foot pedal or the second foot pedal. The upper part of the lifting seat is provided with serrations that can mesh with gears provided on the first rotating wheel and the second rotating wheel, so that the first rotating wheel and the second rotating wheel are relatively fixed to the wheel frame and cannot rotate. The wheel frame is provided with a reset pedal at the second end of the first foot pedal or the second foot pedal. When the reset pedal is subjected to external force, it pushes against the first foot pedal or the second foot pedal, so that the serrations on the lifting seat disengage from the gears, and the first rotating wheel and the second rotating wheel can rotate freely.

[0006] Preferably, the inner surfaces of the first and second rotating wheel rims are provided with anti-fouling isolation rings close to the wheel rim surface. The gear is provided on the inner surfaces of the first and second rotating wheel rims and on the inner circumference of the anti-fouling isolation rings. The teeth of the gear face the center of the rotating wheel rim, and the saw teeth located on the upper part of the lifting seat face the wheel rim surface. In use, the lower ends of the first and second rotating wheel rims abut against the ground, and the wheel frame and the saw teeth on it sink to a certain extent under the force. At this time, the saw teeth are less likely to contact the gear, thus avoiding abnormal noise.

[0007] Preferably, the wheel frame is rotatably connected to a mounting shaft on the side opposite to the reset pedal. A gear disk located inside the wheel frame is fixedly mounted on the mounting shaft. The upper part of the lifting seat is provided with a toothed block that can mesh with the gear disk. When the lifting seat is forced to rise, the toothed block meshes with the gear disk to limit the rotation of the wheel frame relative to the mounting shaft.

[0008] Preferably, the inner sides of the first foot pedal and the second foot pedal are close to each other and the second end is inserted into the through groove of the lifting seat. A gap is formed between the inner sides of the first foot pedal and the second foot pedal for inserting the first traction plate and the second traction plate. The first ends of the first traction plate and the second traction plate are respectively connected to the pins on the inner sides of the first foot pedal and the second foot pedal.

[0009] Preferably, the center of the lifting seat has a strip hole for the hinge shaft to pass through, the through channel is perpendicular to the strip hole and located in the middle of the front and rear sides of the lifting seat, and the upper part of the first foot pedal and the second foot pedal is provided with a cam part that can push against the inside of the through channel. When the first foot pedal and the second foot pedal are subjected to force and rotate around the hinge shaft, the cam part pushes the lifting seat to rise.

[0010] Preferably, the lifting seat is composed of a first part and a second part that can be detachably connected from top to bottom. The saw teeth are provided on the side of the first part, the tooth blocks are provided on the second part, the through channel extends from the second part to the upper end face of the first part, and the second ends of the first traction plate and the second traction plate protrude from the upper end face of the first part.

[0011] Preferably, the lower front side of the lifting seat is provided with a protrusion, and a compression spring is provided between the upper surface of the protrusion and the wheel frame body to drive the lifting seat to descend.

[0012] Preferably, the aforementioned reset pedal component includes a pedal plate and a step rod fixedly connected to the lower end of the pedal plate and extending into the wheel frame. The step rod has a stepped surface, and a spring sleeved on the step rod is provided between the stepped surface and the first recess of the wheel frame. When the step rod moves downward under external force, the lower end of the step rod pushes against the second end of the first foot pedal or the second foot pedal to reset the first foot pedal or the second foot pedal.

[0013] Preferably, the wheel frame is provided with a second recess, and the gear disc, bearing, and sealing cover are sequentially fixed and installed on the mounting shaft and then installed in the second recess.

[0014] The working method of this utility model of a dual-pedal synchronous caster with a reset button:

[0015] When the caster needs to be braked, step on the first end of the first or second foot pedal. The first or second foot pedal rotates around the hinge axis, driving the lifting seat to rise. The serrations of the lifting seat mesh with the gears on the first and second rotating wheel rims, so that the first and second rotating wheel rims are relatively fixed to the wheel frame and cannot rotate. Even if the caster rolls, braking is achieved.

[0016] When the casters need to be unlocked, step on the reset pedal. When the reset pedal is subjected to external force, it pushes against the second end of the first or second pedal, causing the saw teeth on the lifting seat to disengage from the gear, so that the first and second rotating wheels can rotate freely.

[0017] This utility model features a dual-pedal synchronous caster with a reset button. When a reset is needed, simply stepping on the reset pedal from top to bottom will reset either the first or second pedal. This eliminates the need for the operator to insert their toes between the pedal and the ground for reset, making it more convenient and faster than existing methods. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention in an unbraked state;

[0019] Figure 2 This is a perspective view of the present invention in a braking state;

[0020] Figure 3 yes Figure 1 Exploded view;

[0021] Figure 4 yes Figure 3 A partial view;

[0022] Figure 5 yes Figure 4 A 3D view of the vehicle in braking mode;

[0023] Figure 6 yes Figure 5 The 3D view of the lifting platform is omitted.

[0024] Figure 7 This is a partial exploded view of the present invention in its unbraked state;

[0025] Figure 8 This is an exploded view of the elevator platform;

[0026] Figure 9 It is a 3D view of the repositioning pedal component;

[0027] Figure 10 This is an exploded view of the rotating rim and the first component;

[0028] Figure 11 This is a cross-sectional view of the present invention in an unbraked state;

[0029] Figure 12 This is a cross-sectional view of the present invention in the braking state. Detailed Implementation

[0030] This utility model of a double-pedal synchronous caster with a reset button includes a wheel frame 1 and a first rotating wheel rim 3 and a second rotating wheel rim 4 rotatably connected to the front and rear sides of the wheel frame 1 via a hinge shaft 2. When the caster is in use, the lower edges of the first rotating wheel rim 3 and the second rotating wheel rim 4 are in contact with the ground, and they can rotate relative to the wheel frame 1 (in the unlocked state).

[0031] A first foot pedal 5 and a second foot pedal 6 are rotatably connected to the wheel frame 1 via a hinge shaft 2. The first end 5A of the first foot pedal 5 extends out of the left side of the wheel frame, and the first end 6A of the second foot pedal 6 extends out of the right side of the wheel frame. The first foot pedal 5 is rotatably hinged to the first end of a first traction plate 7 at a position relatively close to its first end, and the second foot pedal 6 is rotatably hinged to the first end of a second traction plate 8 at a position relatively close to its first end. The second ends of the first traction plate 7 and the second traction plate 8 are hinged to a guide block 9 slidably connected to the wheel frame. The guide block 9 is slidably connected within a groove in the wheel frame and has a connection point with the first traction plate 7. The positioning pin, which is hinged to the second ends of the first pull plate 7 and the second pull plate 8, rotates together. Through the first pull plate 7, the second pull plate 8 and the guide block 9, the first foot pedal 5 and the second foot pedal 6 can be linked. That is, when the first end of the first foot pedal 5 is subjected to force and descends, the first foot pedal 5 rotates around the hinge axis 2 and pulls the first pull plate 7, which drives the guide block 9 and the second pull plate 8 to move downward, and then pushes the second foot pedal 6 to rotate around the hinge axis 2. This achieves the descent of the first end of the second foot pedal 6, and thus realizes the synchronous linkage action of the first foot pedal 5 and the second foot pedal 6. Similarly, when the first end of the first foot pedal 5 is subjected to force and rises, the first end of the second foot pedal 6 rises in linkage.

[0032] The wheel frame 1 is equipped with a lifting seat 10 that can be pushed up by the first foot pedal or the second foot pedal. The upper part of the lifting seat 10 is provided with saw teeth 14 that can mesh with the gears 13 on the first rotating wheel rim 3 and the second rotating wheel rim 4. When the lifting seat 10 is pushed up by the first foot pedal or the second foot pedal, the saw teeth 14 on the lifting seat 10 mesh with the gears 13 on the first rotating wheel rim 3 and the second rotating wheel rim 4, so that the first rotating wheel rim and the second rotating wheel rim are relatively fixed to the wheel frame and cannot rotate, thus realizing the braking of the caster (i.e., the caster braking position).

[0033] A reset pedal 15 is provided on the wheel frame at the second end of the first or second foot pedal. When the reset pedal is subjected to external force, it pushes the first foot pedal 5 or the second foot pedal 6 from top to bottom. The pushing direction of the reset pedal is the same as the sliding direction of the guide block 9, so that the saw teeth 14 on the lifting seat move downward and disengage from the gear 13, thereby enabling the first and second rotating wheel rings to be released from the restriction and rotate freely (i.e., the caster unlocking position).

[0034] In order to reduce the increase in caster resistance caused by hair or other objects getting caught in the casters, the inner sides of the first and second swivel wheel rims are provided with anti-fouling isolation rings 16 near the wheel rim surface. The anti-fouling isolation rings 16 can prevent hair or other objects from getting caught in the casters.

[0035] Gear 13 is provided on the inner surface of the first and second rotating wheel rings and on the inner circumference of the anti-fouling isolation ring. The teeth of the gear face the center of the rotating wheel ring (i.e., the teeth facing inward). There is a gap between the gear ring 13 and the anti-fouling isolation ring 16. The saw teeth located on the upper part of the lifting seat face the rim surface of the rotating wheel ring (i.e., the saw teeth are outward, or the saw teeth face upward in the figure). In use, the lower ends of the first and second rotating wheel rings abut against the ground. The wheel frame 1 and the saw teeth 14 on it sink to a certain extent under the force (i.e., transmitted from the vehicle body to the wheel frame 1). Conversely, the teeth of gear 13 tend to face upward. At this time, the saw teeth are less likely to contact the gear, thus avoiding abnormal noise. If the gear has outward teeth and the saw teeth are located on the lower part of the lifting seat (saw teeth facing upward, i.e., the publicly disclosed document CN102602241B mentioned in the background art), the gear 13 is more likely to face upward. Figure 2 In the non-working state (i.e., not used in the vehicle body, the rotating wheel rim can rotate smoothly relative to the wheel frame without any abnormal noise), a gap can be designed between the two (this gap is limited to 1-5 mm due to size constraints). However, after being used on the vehicle body, the weight of the vehicle body and the load on the vehicle body causes this gap to shrink due to plastic deformation. When the load increases further, there will be some contact between the saw teeth and the gear, which can easily produce abnormal noise (i.e., a small contact between the saw teeth and the gear, i.e., the saw teeth and the gear contact at the tooth tip). The above-mentioned design of this application (i.e., the teeth of the gear 13 face the center of the rotating wheel rim, and the saw teeth 14 are located on the upper part of the lifting seat and face upward towards the wheel rim surface of the rotating wheel rim) can completely overcome the above defects.

[0036] In addition, this design can overcome the problem of the wall thickness of the saw teeth 14. If the gear is made with outward-facing teeth and the saw teeth are set at the bottom of the lifting seat (saw teeth facing upward), the wall thickness of the saw teeth is limited to a thinner design due to the size of the anti-fouling isolation ring 16 and the gap between the gear ring and the anti-fouling isolation ring 16. The strength of the saw teeth is low, and they are prone to breakage under stress during use, which causes the caster brake to fail. In addition, the gear diameter of this design is larger, and the braking effect of the saw teeth on the gear is better.

[0037] A mounting shaft 17 is rotatably connected to the wheel frame 1 on the opposite side of the reset pedal 15. A gear disk 18 located inside the wheel frame is coaxially fixed on the mounting shaft 17. The upper part of the lifting seat 10 is provided with a toothed block 19 that can mesh with the gear disk. When the lifting seat is forced to rise, the toothed block meshes with the gear disk to restrict the rotation of the wheel frame relative to the mounting shaft. The mounting shaft 17 is rotatably connected to the foot of the vehicle body around the axis. After the lifting seat rises, the toothed block 19 meshes with the gear disk 18, thereby achieving relative fixation between the wheel frame 1 and the mounting shaft 17. When the lifting seat descends, the toothed block 19 disengages from the gear disk 18, thereby enabling the wheel frame 1 and the mounting shaft 17 to rotate relative to each other.

[0038] The inner sides of the first and second foot pedals are close to each other, and their second ends are inserted into the through groove 20 of the lifting seat. A gap is formed between the inner sides of the first and second foot pedals for the first and second traction plates to pass through. The first ends of the first and second traction plates are respectively connected to the pins 21 on the inner sides of the first and second foot pedals. The two pins 21 on the first and second foot pedals are located on both sides of the hinge shaft 2. The first foot pedal 5, the second foot pedal 6, the first traction plate 7, the second traction plate 8 and the guide block 9 form a linkage mechanism, so that when the first foot pedal 5 or the second foot pedal 6 is stepped on, the other foot pedal is also linked.

[0039] The center of the aforementioned lifting seat 10 has a strip-shaped hole 22 for the hinge shaft to pass through. The through channel 20 is perpendicular to the strip-shaped hole and located in the middle of the front and rear sides of the lifting seat. The upper part of the first foot pedal 5 and the second foot pedal 6 is provided with a cam part 23 that can push against the inside of the through channel. When the first foot pedal and the second foot pedal are subjected to force and rotate around the hinge shaft, the cam part pushes the lifting seat to rise. At this time, it is also at the dead point position (braking position) of the first foot pedal and the second foot pedal. It will not disengage when there is no external force at this dead point position.

[0040] For ease of assembly, the aforementioned lifting seat 10 is composed of a first split 10A and a second split 10B that can be detachably connected from top to bottom. The saw teeth 14 are provided on the side of the first split 10A, the tooth blocks 19 are provided on the second split 10B, the through channel 20 extends from the lower end face of the second split to the upper end face of the first split, and the second ends of the first pulling piece and the second pulling piece protrude from the upper end face of the first split.

[0041] To facilitate the resetting of the lifting seat, a protrusion 24 is provided on the lower front side of the lifting seat 10. A compression spring 25 is provided between the upper surface of the protrusion and the wheel frame. The compression spring 25 causes the lifting seat to move downward. Only after the first foot pedal 5 and the second foot pedal 6 are rotated under force, the cam part 23 causes the lifting seat to move upward against the elastic force of the compression spring.

[0042] The reset pedal component 15 includes a pedal piece 26 and a step rod 27 fixedly connected to the lower end of the pedal piece and extending into the wheel frame. The step rod has a stepped surface, and a spring 28 is provided between the stepped surface and the first recess of the wheel frame and sleeved on the step rod. When the step rod moves downward under external force (the user's downward stepping force), the lower end of the step rod pushes against the second end of the first foot pedal or the second foot pedal, so that the first foot pedal and the second foot pedal are reset, that is, the first foot pedal and the second foot pedal are reset by rotating counterclockwise around the hinge shaft 2.

[0043] For a reasonable design, a second sink groove 11 is provided on the wheel frame body 1. The gear disk 18, bearing 12, and sealing cover are sequentially fixed and installed on the mounting shaft and then installed in the second sink groove 11.

[0044] The working method of this utility model of a dual-pedal synchronous caster with a reset button:

[0045] When the caster needs to be braked, step on the first end of the first or second foot pedal. The first or second foot pedal rotates around the hinge axis, driving the lifting seat to rise. The serrations of the lifting seat mesh with the gears on the first and second rotating wheel rims, so that the first and second rotating wheel rims are relatively fixed to the wheel frame and cannot rotate. Even if the caster rolls, braking is achieved.

[0046] When the casters need to be unlocked, step on the reset pedal. When the reset pedal is subjected to external force, it pushes against the second end of the first or second pedal, causing the saw teeth on the lifting seat to disengage from the gear, so that the first and second rotating wheels can rotate freely.

[0047] This utility model features a dual-pedal synchronous caster with a reset button. When a reset is needed, simply stepping on the reset pedal from top to bottom will reset either the first or second pedal. This eliminates the need for the operator to insert their toes between the pedal and the ground for reset, making it more convenient and faster than existing methods.

[0048] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A dual-pedal synchronous caster with a reset button, characterized in that: The device includes a wheel frame and a first rotating wheel rim and a second rotating wheel rim rotatably connected to the front and rear sides of the wheel frame via hinge shafts. A first foot pedal and a second foot pedal are rotatably connected to the wheel frame. The first end of the first foot pedal extends out of the left side of the wheel frame, and the first end of the second foot pedal extends out of the right side of the wheel frame. The first foot pedal is rotatably hinged to the first end of a first traction plate at a position relatively close to its first end, and the second foot pedal is rotatably hinged to the first end of a second traction plate at a position relatively close to its first end. The second ends of the first and second traction plates are hinged to a guide block slidably connected to the wheel frame. The wheel frame has a lifting seat inside that can be pushed up by the first or second foot pedal. The upper part of the lifting seat has serrations that can mesh with gears on the first and second rotating wheel rims. A reset pedal is provided on the wheel frame at the second end of the first or second foot pedal. When the reset pedal is subjected to external force, it pushes against the first or second foot pedal, causing the serrations on the lifting seat to disengage from the gears.

2. The dual-pedal synchronous caster with a reset button according to claim 1, characterized in that: The first and second rotating wheel rims are provided with anti-fouling isolation rings close to the wheel rim surface on their inner surfaces. The gear is provided on the inner surface of the first and second rotating wheel rims and on the inner circumference of the anti-fouling isolation ring. The teeth of the gear face the center of the rotating wheel rim, and the saw teeth located on the upper part of the lifting seat face the wheel rim surface of the rotating wheel rim.

3. The dual-pedal synchronous caster with a reset button according to claim 1 or 2, characterized in that: A mounting shaft is rotatably connected to the wheel frame on the side opposite to the reset pedal. A gear disc located inside the wheel frame is fixedly mounted on the mounting shaft. The upper part of the lifting seat is provided with a toothed block that can mesh with the gear disc.

4. The dual-pedal synchronous caster with a reset button according to claim 3, characterized in that: The inner sides of the first foot pedal and the second foot pedal are close to each other and the second ends are inserted into the through groove of the lifting seat. A gap is formed between the inner sides of the first foot pedal and the second foot pedal for inserting the first traction plate and the second traction plate. The first ends of the first traction plate and the second traction plate are respectively connected to the pins on the inner sides of the first foot pedal and the second foot pedal.

5. The dual-pedal synchronous caster with a reset button according to claim 4, characterized in that: The center of the lifting seat has a strip-shaped hole for the hinge shaft to pass through. The through channel is perpendicular to the strip-shaped hole and located in the middle of the front and rear sides of the lifting seat. The upper part of the first foot pedal and the second foot pedal is provided with a cam part that can push against the inside of the through channel. When the first foot pedal and the second foot pedal are subjected to force and rotate around the hinge shaft, the cam part pushes the lifting seat to rise.

6. The dual-pedal synchronous caster with a reset button according to claim 5, characterized in that: The lifting seat is composed of a first part and a second part that can be detachably connected from top to bottom. The saw teeth are provided on the side of the first part, the tooth blocks are provided on the second part, the through channel extends from the second part to the upper end face of the first part, and the second ends of the first traction plate and the second traction plate protrude from the upper end face of the first part.

7. The dual-pedal synchronous caster with a reset button according to claim 6, characterized in that: The lower front side of the lifting seat is provided with a protrusion, and a compression spring is provided between the upper surface of the protrusion and the wheel frame to drive the lifting seat to descend.

8. The dual-pedal synchronous caster with a reset button according to claim 1, characterized in that: The reset pedal component includes a pedal plate and a step rod fixedly connected to the lower end of the pedal plate and extending into the wheel frame. The step rod has a stepped surface, and a spring is provided between the stepped surface and the first groove of the wheel frame and the step rod.

9. The dual-pedal synchronous caster with a reset button according to claim 3, characterized in that: The wheel frame is provided with a second sink groove, and the gear disk, bearing, and sealing cover are sequentially fixed and installed on the mounting shaft and then installed in the second sink groove.

10. The dual-pedal synchronous caster with a reset button according to claim 2, characterized in that: The gears on the first and second rotating wheel rims are located on the inner circumference of the anti-fouling isolation ring and have a gap. The guide block is slidably connected in the groove of the wheel frame body. The first ends of the first and second traction plates are rotatably hinged to the first and second foot pedals by pins.

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