Pedal adjustment device

Abstract

This invention discloses a foot pedal adjustment device, including a support body and rotating sides located on both sides of the support body. The rotating sides are connected to the support body via rotating cylinders. The support body has a cavity with a control rod inserted inside. Both ends of the control rod protrude from the support body and are exposed inside the rotating cylinder, with annular cylinders inserted therein. The upper half of the annular cylinder has a radially penetrating receiving hole with a ball bearing inside. The rotating cylinder also has a limiting groove that mates with the ball bearing. The end of the control rod is connected to a limiting plate with an inclined surface. The foot rest mechanism has unlocked and locked states: when the control rod drives the limiting plate to move axially into the cavity, leaving space for the ball bearing, the ball bearing falls due to gravity and the part exposed in the receiving hole rests against the inclined surface of the limiting plate, this is the unlocked state; when the rotating cylinder rotates and aligns the limiting groove with the receiving hole, the limiting plate is pushed outward, causing the inclined surface to push the ball bearing into the limiting groove and lock it between the annular cylinder and the rotating cylinder, this is the locked state.

Description

Technical Field

[0001] This invention belongs to the field of seating, specifically a foot pedal adjustment device that can provide stable support. Background Technology

[0002] Chairs are a common type of furniture in daily work and life, typically consisting of a seat, backrest, and legs. Early chairs did not have footrests, meaning users' feet had to remain on the ground for extended periods, making it difficult to relax their legs properly when reclining. To meet people's needs, various chairs with footrests have now appeared on the market.

[0003] As disclosed in CN21192856, the footrest structure and seat include: a support shaft having a first locking position and a second locking position in the circumferential direction; a footrest plate including a root end and a free end facing each other, with a receiving cavity on the root end to accommodate the support shaft, and the footrest plate being rotatable relative to the support shaft; a movable locking member disposed within the receiving cavity of the footrest plate, the movable locking member moving radially along the support shaft; when the footrest plate rotates to engage with the first and second locking positions, the footrest plate remains relatively fixed to the support shaft, and the footrest plate is in a locked state; when the movable locking member separates from the first and second locking positions, the footrest plate is in an unlocked state and rotates around the support shaft; and a seat in which the footrest plate can be folded under the seat. This invention rotates the support shaft on the footrest plate, causing the movable locking member on it to move, controlling the fixing and rotation of the support shaft by locking and disengaging the movable locking member at different locking positions.

[0004] The locking mechanism is quite complex. First, a sector-shaped body for positioning needs to be installed on the support shaft, with additional reinforcing members to secure and strengthen the connection. Two locking positions are provided on the sector surface for locking with the corresponding structure when open and fully retracted. Therefore, the structure of the footrest body needs to be improved to mate with the two locking positions of the sector body, and an external cover plate for decoration. The footrest body structure needs to have accommodating cavities that match the sector body during rotation and positioning, and additional movable locking members are used to lock the sector body in its correct position. Further reinforcing members are needed to make the locking more stable. Simultaneously, the cover plate also needs structural adjustments to better fit the footrest. The numerous and complex components requiring improvement or addition necessitate a simpler yet sufficiently stable footrest mechanism. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the purpose of this invention is to provide a foot pedal adjustment device that achieves the rotation and fixation of the rotating part by setting a ball and a limiting groove at the connection between the foot rest rotating part and the support body. The mechanism has a simple structure and sufficient stability.

[0006] The technical solution of this invention is implemented as follows: A foot pedal adjustment device includes a footrest rotating component and a support body. The footrest rotating component includes rotating sides located on both sides of the support body. A rotating cylinder is provided at one end of the rotating side near the support body, and the rotating cylinder is respectively attached to both ends of the support body. A cavity is formed in the support body, and a control rod is provided within the cavity. The control rod is inserted into the support body, protruding from both ends of the support body and exposed inside the rotating cylinder. An annular cylinder is inserted into the rotating cylinder and is fixedly connected to the end of the support body. The upper half of the annular cylinder has a radially penetrating receiving hole, and a ball bearing is placed inside the receiving hole. A limiting groove is provided on the rotating cylinder to cooperate with the ball bearing. The ball bearing can pass through the receiving hole at both ends. A limiting plate is connected to the end of the control rod, and the limiting plate is located inside the annular cylinder. The limiting plate has an inclined surface that presses against the ball bearing. The foot pedal adjustment device has unlocked and locked states. In the unlocked state, the control rod drives the limiting plate axially into the cavity. Leave space for the ball bearings so that they move down along the receiving hole under gravity and the part of the ball bearings protruding from the receiving hole rests against the inclined surface of the limiting plate. At this time, the foot rest rotating component can rotate. In the locked state, that is, when the foot rest rotating component rotates to align the limiting groove with the receiving hole, the limiting plate moves outward with the control rod and uses the inclined surface to push the ball bearings from the receiving hole into the limiting groove, so that the ball bearings are stuck between the annular cylinder and the rotating cylinder. At this time, the foot rest rotating component and the support body remain relatively fixed. By setting ball bearings in the upper half of the annular cylinder, the ball bearings will fall with gravity and are held in place by a limiting plate with an inclined surface. When the ball bearings do not match the limiting groove, the ball bearings fall downwards and are held in place by the limiting plate. At this time, the foot rest rotating component can rotate relative to the support body. When the limiting groove rotates to the ball bearing position, the limiting plate pushes outwards to push the ball bearings into the limiting groove. At this time, the ball bearings are stuck between the rotating cylinder and the annular cylinder, so that the foot rest rotating component is circumferentially fixed to the support body.

[0007] Preferably, the support body has a threaded hole at its end, and the annular cylinder abuts against the end of the support body and is fixed by screws. The rotating cylinder is not directly connected to the support body, but is fixedly connected by screws driven into matching threaded holes on the support body through the side of the annular cylinder inserted inside the rotating cylinder that contacts the support body.

[0008] Preferably, the end of the annular cylinder facing the support body extends axially to form a root end, which has a channel to avoid the control rod. Both ends of the support body have root end slots that match the shape of the root end. After the root end is inserted into the root end slot, it is circumferentially fixed to the support shaft, and the inner side of the annular cylinder abuts against the end of the support body and is connected and fixed to the support body. The root end and root end slots allow the annular cylinder to be quickly aligned with the support body in the axial direction, and also facilitate the alignment of the holes in the annular cylinder and the support body where screws need to be driven in.

[0009] Preferably, the root end is flat, and the root end slots at both ends of the support body are flat insertion ports that match the shape of the root end. The annular cylinder has through slots and through holes where they match the threaded holes. Screws are driven in through the through slots and through holes to securely connect the support body to the annular cylinder. Setting the root end and root end slot to a matching flat shape allows for direct circumferential fixation after insertion, and also aligns the holes requiring screw connections, facilitating screw insertion. Furthermore, it makes the installation of ball bearings easier after the annular cylinder is circumferentially fixed.

[0010] Preferably, a spring is fitted around the portion of the control lever protruding from the rotating cylinder. One end of the spring abuts against the periphery of the position where the control lever protrudes inside the annular cylinder, and the other end abuts against the limiting plate. When the control lever drives the limiting plate axially into the cavity, the spring is compressed, generating a restoring force. The inclined surface of the limiting plate pushes the ball against the inner wall of the rotating cylinder in the opposite direction. When the footrest rotating component rotates until the limiting groove aligns with the receiving hole, the restoring force drives the limiting plate and control lever to move in the opposite direction and pushes part of the ball into the limiting groove through the inclined surface. The pushing force of the limiting plate on the ball is provided by the spring. When the foot pedal adjustment device is in the unlocked state, the limiting plate moves into the cavity and the ball falls. At this time, the spring is compressed by the limiting plate, generating an outward pushing force. When the limiting groove on the rotating cylinder rotates to match the ball, the spring pushes the limiting plate outward, causing the inclined surface of the limiting plate to push the ball into the limiting groove. At this time, the foot pedal adjustment device switches from the unlocked state to the locked state.

[0011] Preferably, the limiting plate has a central hole, and the control rod is a hollow rod with screw holes at both ends. The limiting plate rests against the ends of the control rod, aligning the central hole with the screw holes, and screws are screwed in to securely connect the support shaft and the limiting plate. The limiting plate then screws into the ends of the hollow control rod at its center to fix the two together.

[0012] Preferably, the locking state is divided into an open foot rest state and a retracted foot rest state. Multiple limiting grooves are distributed circumferentially on the inner wall of the rotating cylinder. In the open or retracted foot rest state, the corresponding limiting grooves engage with the ball bearings. In the locked state, all ball bearings are pressed into the matching limiting grooves by the limiting discs. In the unlocked state, the ball bearings are not in the limiting grooves and roll and rub against the inner wall of the rotating cylinder.

[0013] Preferably, two receiving holes and two ball bearings are provided in the upper half of the annular cylinder, and three limiting grooves that cooperate with the ball bearings are provided on the inner wall of the rotating cylinder. When the rotating cylinder and the annular cylinder are fixed relative to each other, the two ball bearings engage with the two adjacent ones in the limiting grooves. There are a total of two ball bearings on the annular cylinder. Since the locking state is divided into a use state and a storage state, a total of three limiting grooves are provided to cooperate with the ball bearings. In the locking state, the ball bearing engages with the two adjacent ones.

[0014] Preferably, the support body is equipped with a control unit, with control levers located on the left and right sides of the control unit. The control unit includes a base and a button. The base is fixedly connected to the support body, and the base has a slide rail along the axial direction of the support body. A connecting seat is provided within the slide rail, and the connecting seat includes a connecting post connected to the control lever and a mating part that cooperates with the button. The button and the mating part are engaged by an inclined surface, and the action of the button causes the mating part and the control lever to move along the slide rail. The control unit within the support body is used to control the axial movement of the limiting plate. This control unit is fixedly connected to the support body via the base and divides the control lever into left and right parts. The control unit, through the button and the inclined surface of the button and the mating part, enables the control levers on both sides to drive the axial movement of the limiting plate.

[0015] Preferably, the connecting post is hollow and has a pin opening along the radial direction. The control rod has a radial opening at a position that matches the pin opening. Inserting the pin connects the control rod to the connecting seat. The connecting post on the connecting seat that connects to the control rod is a hollow rod. After inserting the control rod into the connecting post, a radial pin is driven in to fix the two together.

[0016] Preferably, a button is located in the center of the support body, and several connection holes are provided around the base. The support body has threaded holes that match the connection holes. After the base and support body are connected by screws, the upper end of the button protrudes through the button slot. The control unit is fixed to the support body by providing connection holes on its base and threading them together with the support body. After connection, the button protrudes through the button slot on the support body for user use.

[0017] Preferably, the button has two symmetrical control blocks, and the mating part has a trapezoidal groove. The contact surface between the control block and the trapezoidal groove is an inclined surface. By engaging the trapezoidal control block on the button with the inclined surface of the trapezoidal groove on the mating part, the button moves when pressed, causing the connecting seat to move axially inward.

[0018] Preferably, the surface of the rotating cylinder that contacts the support body has several sliding grooves, and the support body has sliding balls positioned to match the sliding grooves. When the rotating cylinder rotates, the sliding balls switch between different sliding grooves. To reduce friction between the rotating cylinder and the support body, the sliding balls and sliding grooves on their contact surface facilitate rotation.

[0019] A type of seat includes a seat, a pull-out rod, and the aforementioned foot pedal adjustment device. The pull-out rod is symmetrically arranged on the left and right sides of the seat, and a support body is connected to the front end of the pull-out rod. The aforementioned foot pedal adjustment device is installed on the seat by pulling it out. In this way, the foot pedal adjustment device can be stored under the seat when not in use, making the overall appearance more aesthetically pleasing. When needed, it can be pulled out directly for convenient use.

[0020] The principle and beneficial effects of the present invention, which adopts the above technical solution, are as follows: This invention provides a foot pedal adjustment device. First, after aligning the rotating cylinder and the support body, the control rod is inserted into the cavity of the support body, with both ends protruding from the sides of the support body and exposed inside the rotating cylinder. The rotating cylinder is axially fixed and can rotate circumferentially around the support body. An annular cylinder is then inserted into the flat root end of the support body via its flat root end connector, and the two are connected with screws. At this point, the outer wall of the annular cylinder is in contact with the inner wall of the rotating cylinder. A receiving hole is provided in the upper half of the annular cylinder, and a ball bearing is placed inside. The ball bearing will fall due to gravity; therefore, a limiting plate with an inclined surface is provided at the ball bearing location to hold it in place. By moving the limiting plate along the axial direction of the support shaft, the inclined surface of the limiting plate compresses the ball bearing, changing its position within the annular cylinder. The foot pedal adjustment device has an unlocked and locked state because the ball bearing is located radially upwards on the rotating cylinder and a limiting groove matching the ball bearing is provided on the rotating cylinder. The control rod drives the limiting plate to move axially into the cavity, and the ball bearing falls from the receiving hole and is stopped by the inclined surface of the limiting plate. At this time, the foot pedal adjustment device is in the unlocked state, and the rotating cylinder can rotate. When the rotating cylinder rotates and the limiting groove is in the position of the ball bearing, the limiting plate is pushed and pulled to push the ball bearing into the limiting groove. At this time, part of the ball bearing is in the limiting groove of the rotating cylinder, and the other part is in the receiving hole of the annular cylinder. The limiting plate restricts the movement of the ball bearing, and the rotating cylinder and the annular cylinder are relatively fixed, so that the foot pedal adjustment device is in the locked state. Attached Figure Description

[0021] Figure 1 An exploded view of the foot pedal adjustment device in use; Figure 2 A 3D view of the foot pedal adjustment device in use; Figure 3 A 3D view of the control lever; Figure 4 This is a cross-sectional view of the control lever; Figure 5 This is a schematic diagram showing the connection between the support body and the rotating part; Figure 6 This is a schematic diagram of the control lever installation. Figure 7 This is a schematic diagram showing the connection of the annular cylinder and its included fittings; Figure 8 This is a cross-sectional view of the foot pedal adjustment device in use. Figure 9 for Figure 8 Enlarged view of A in the middle; Figure 10 A 3D view of the foot pedal adjustment device when it is rotating; Figure 11 This is a cross-sectional view of the foot pedal adjustment device when it is rotating; Figure 12 for Figure 10 Enlarged view of B in the middle; Figure 13 A 3D view of the foot pedal adjustment device when stored; Figure 14 This is a cross-sectional view of the foot pedal adjustment device when stored. Figure 15 for Figure 13 Enlarged view of C in the middle; The reference numerals in the attached drawings are as follows: 100-foot rest rotating component, 101-rotating side, 102-rotating cylinder, 103-limiting groove, 104-slip groove, 105-crossbeam, 106-groove, 200-support body, 201-cavity, 202-connecting threaded hole, 203-button groove, 204-slip ball, 205-root end slot, 300-control part, 301-control rod, 302-screw hole, 303-base, 304-button key, 305-connecting hole. 306-Slide groove, 307-Connecting post, 308-Pin opening, 309-Radial opening, 310-Mating part, 311-Trapezoidal groove, 312-Control block, 313-Connecting seat, 400-Annular cylinder, 401-Accommodation hole, 402-Ball, 403-Root end, 404-Channel, 405-Through hole, 406-Through groove, 500 Limiting plate, 501-Ceiling surface, 502-Spring, 503-Central hole, 504-End cap, 600-Pull rod. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0024] The specific embodiments of the present invention are as follows: like Figure 5As shown, this embodiment first provides a foot pedal adjustment device, including a footrest rotating component 100 and a support body 200. The footrest rotating component 100 is used to install a footrest pad. In this embodiment, the footrest rotating component 100 includes rod-shaped rotating sides 101 located on both sides of the support body 200. The two rotating sides 101 are connected by a crossbeam 105, so that the footrest rotating component 100 is relatively fixed as a whole. Grooves 106 are opened on the outward-facing sides of the rotating sides 101, and these grooves 106 are used for subsequent installation and fixing of the footrest pad. A rotating cylinder 102 is provided on the rotating side 101 to fit against both ends of the support body 200. Since some necessary components need to be set up to achieve the corresponding purpose, therefore... Figure 6 As shown, a cavity 201 is formed in the support body 200, and a control rod 301 is set in the cavity 201. In order to accommodate the control rod 301, the support body 200 is a hollow long cylinder. For the sake of overall aesthetics, the opening of the cavity 201 is set on the bottom side of the support body 200, so that the opening of the cavity 201 will not be visible during normal use. When the control rod 301 is inserted into the support body 200, both ends protrude from both ends of the support body 200, and part of both ends of the rod protrudes into the rotating cylinder 102. After the control rod 301 is installed, the annular cylinder 400 with a channel 404 for the control rod 301 to pass through is connected to the end of the control rod 301 inserted into the rotating cylinder 102. After the insertion is completed, the outer wall of the annular cylinder 400 fits against the inner wall of the rotating cylinder 102, and the end face of the annular cylinder 400 fits against the end face of the support body 200. Screws are driven in to fix the two ends together.

[0025] In order to enable the foot pedal adjustment device to switch between locked and rotating states, such as Figure 7 As shown, a radially extending receiving hole 401 is provided in the upper half of the annular cylinder 400, and a ball bearing 402 is placed in the receiving hole. The purpose of the ball bearing 402 being located in the upper half of the annular cylinder is to allow the ball bearing 402 to fall with gravity. At the same time, a limiting groove 103 that can cooperate with the ball bearing 402 is also provided on the rotating cylinder 102. In order to prevent the ball bearing 402 from falling out, a limiting plate 500 with an inclined surface 501 is provided at the corresponding position, that is, at the end face of the control rod 301 inside the annular cylinder 400. The limiting plate 500 can move axially along the control rod 301 inside the annular cylinder 400 so that a part of the ball bearing 402 can fall out of the receiving hole 401 and be blocked by the limiting plate 500, or the ball bearing 402 can be completely pushed into the limiting groove 103. These two positional states of the ball bearing 402 determine whether the foot pedal adjustment device is in the unlocked or locked state.

[0026] Figures 10-12The diagram shown is of the unlocked state. Pulling the control lever 301 causes the limiting plate 500 to move axially into the cavity 201. The inclined surface 501 of the limiting plate 500 leaves room for the ball 402. The ball 402 falls away from the limiting groove 103 under the action of gravity, so that the foot rest rotating part 100 can rotate. Figures 13-15 The diagram shown is a schematic of the locked state. When the limiting groove 103 rotates to the position where the ball 402 is located, the limiting plate 500 pushes outward and pushes the ball 402 into the limiting groove through the inclined surface 501. At this time, the ball 402 is stuck between the annular cylinder 400 and the rotating cylinder 102, and the foot rest rotating part 100 and the support body 200 are relatively fixed.

[0027] The above describes the general components of this foot pedal adjustment device. The following sections will provide a detailed description of each component: To ensure that the annular cylinder 400 and the rotating cylinder 102 are stably connected to the support body 2, firstly as follows: Figure 1 As shown, two threaded holes 202 are opened on the end faces of both ends of the support body 200. Simultaneously, through holes 405 for screws to pass through and through grooves 406 for screw avoidance are opened at corresponding positions on the annular cylinder 102. After completion... Figure 5 , Figure 6 After the installation steps shown, insert the annular cylinder 400 into the rotating cylinder 102 and fix it to the support body with screws.

[0028] However, considering that directly connecting the annular cylinder 400 and the support 200 with screws might be somewhat difficult, aligning the end faces and connecting holes of both might be challenging. Therefore, if... Figure 1 As shown, a root end 403 extends from the side of the annular cylinder 400 that contacts the support body 200. A channel 404 is opened on the root end 403 to avoid the control rod 301. At the same time, root end slots 205 matching the root end 403 are opened at both ends of the support body 200. After the rotating cylinder 102 is attached to both sides of the support body 200 and the control rod 301 is installed, the root end 403 is inserted into the root end slot 205 until the annular cylinder 400 and the rotating cylinder 102 are completely attached. In order to make it easier to connect the annular cylinder 400 and the support body 200, the root end 403 and the root end slot 205 are set to a shape matching irregular shape in this embodiment. The irregular shape in this embodiment is flat. In this way, after insertion, the rotating cylinder 400 is circumferentially fixed with the support body 200 and the through hole 405 and the connecting thread hole 202 are directly aligned without manual alignment, which facilitates the screwing in.

[0029] like Figure 3 , Figure 7As shown, before the limiting disc 500 is connected to the control lever 301, a spring 502 needs to be pre-installed on the part of the control lever 301 located on the rotating cylinder 102. This ensures that after the limiting disc 500 is pulled inward along the axial direction of the control lever 301, the foot pedal adjustment device is in a position similar to... Figures 10-12 In the unlocked state, the spring 502 holds the ball 402 in place. When the rotating cylinder 102 rotates, the limiting groove 103 moves to the position of the ball 402. The limiting plate 500 moves outward due to the spring 502's return force and pushes the ball 402 into the limiting groove 103 via the inclined surface 501. This completes the switch of the foot pedal adjustment device from the unlocked state to the locked state. The locked state is as follows: Figure 2 , Figure 8 , Figure 9 The usage status shown and as follows Figures 13-15 The storage status is shown.

[0030] The installation method for the limit plate 500 and the control lever 301 is as follows: Figure 7 As shown, a central hole 503 is provided in the center of the limiting plate 500, and the control rod 301 is a rod with a central hole and screw holes 302 at both ends. The limiting plate 500 is pressed against the end face of the control rod 301 so that the central hole 503 and the screw holes are aligned, and screws are screwed in to fix the two.

[0031] The foot pedal adjustment device needs to be locked when fully folded and in use; therefore, the rotating cylinder 102 needs to have multiple circumferentially distributed limiting grooves 103 inside, such as... Figure 9 When using and Figure 15 As shown in the cross-sectional view during storage, the ball bearing 402 engages with the corresponding limiting groove 103 in both states. To meet the usage requirements of the limiting groove 103 during storage and use, two ball bearings 402 and two receiving holes 401 are provided in this embodiment, and a total of three limiting grooves 103 are provided on the rotating cylinder 102. Since the positions of the two ball bearings 402 are fixed, and both ball bearings 402 need to engage with the two limiting grooves 103 during storage and use, the three limiting grooves 103 are distributed in an isosceles triangle on the rotating cylinder 102.

[0032] To facilitate user operation and control of the foot pedal adjustment device's unlocking and locking, a control unit 300 is provided on the support body 200. The structure of the control unit 300 is as follows: Figure 3 , Figure 4As shown, the control levers 301 are located on the left and right sides of the control unit 300. The control unit 300 includes a base 303 for connecting to the support body 200 and a button 304 for user interaction. The base has several connection holes 305 around its perimeter. At the same time, the cavity 201 of the support body 200 is provided with a connecting thread hole 202 that matches the connection holes 305. After the base 303 and the support body 200 are connected by screws, the upper end of the button 304 passes through the button groove 203 on the support body 200 that matches the button 304.

[0033] The base 303 of the control unit 300 has a slide 306 along the axial direction of the control rod 301 for the control rod 301 to move axially. Regarding the connection between the control rod 301 and the base 303, a connecting seat 313 is first provided in the slide 306. The connecting seat 313 includes a connecting post 307 that connects to the control rod 301. The connecting post 307 is hollow and its inner wall shape matches the control rod 301. It has a pin opening 308 in the radial direction. The connecting rod 301 is inserted into a place that matches the pin opening 308. There is also a radial opening 309. After the connecting rod 301 is inserted into the connecting post 307, the two are connected by inserting a pin.

[0034] The connecting seat 306 also includes a mating part 310 that cooperates with the button key 304. The mating part 310 has a trapezoidal groove 311. At the same time, the button key 304 is provided with a control block 312 that can cooperate with the trapezoidal groove 311. The part where the control block 312 and the trapezoidal groove 311 fit together is an inclined surface. When the user presses the button key 304, the control block 312 moves downward and drives the two trapezoidal grooves 311 to move inward through the inclined surface, which can drive the control rod 301 and the limit plate 500 to move inward.

[0035] Considering the large rotational friction between the rotating cylinder 102 and the support 200 in direct contact, therefore... Figure 5 As shown, before aligning the rotating cylinder 102, two lubrication balls 204 are inserted into the part of the support body 200 that is about to contact the rotating cylinder 102. At the same time, several lubrication grooves 104 are opened on the corresponding circumferential position on the rotating cylinder 102. In this way, when the rotating cylinder 102 rotates, the lubrication balls 204 switch in different lubrication grooves 104, reducing the friction between the rotating cylinder 102 and the support body 200, making the rotation more effortless. At the same time, for the sake of overall aesthetics, after all the components are connected, an end cap 504 will be placed on the end face of the annular cylinder 400.

[0036] The aforementioned foot pedal adjustment device is ultimately installed on the seat via a pull rod 600. Generally, the pull rod 600 is symmetrically arranged on the left and right sides of the seat. The two ends of the support body 200 in the aforementioned foot pedal adjustment device are connected to the front end of the pull rod 600. When stored, the pull rod drives the foot pedal adjustment device in the stored state to retract to the underside of the seat. When in use, the foot pedal adjustment device is pulled out and the button 304 is pressed to rotate the footrest rotating part 100 to the locked state for use, and then it can be used.

[0037] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A foot pedal adjustment device, characterized in that: The device includes a footrest rotating component and a support body. The footrest rotating component includes rotating sides located on both sides of the support body. A rotating cylinder is located at one end of each rotating side near the support body, and the rotating cylinder is respectively attached to both ends of the support body. A cavity is formed in the support body, and a control rod is installed within the cavity. The control rod extends through both ends of the support body and protrudes into the rotating cylinder. A spring is fitted onto the portion of the control rod protruding into the rotating cylinder. One end of the spring abuts against the periphery of the position where the control rod protrudes within the annular cylinder, and the other end of the spring abuts against a limiting plate. An annular cylinder is inserted into the rotating cylinder and is fixedly connected to the end of the support body. The upper half of the annular cylinder has a radially penetrating receiving hole containing a ball bearing. Multiple limiting grooves that mate with the ball bearing are distributed circumferentially on the inner wall of the rotating cylinder. The ball bearing can protrude from both ends of the receiving hole. A limiting plate is connected to the end of the control rod, and the limiting plate is located within the annular cylinder. The limiting plate has an inclined surface that engages with the ball bearing. The foot pedal adjustment device has unlocking and locking states. The locking state is divided into an open foot rest state and a retracted foot rest state. In the unlocking state, the control lever drives the limiting plate axially into the cavity, leaving space for the ball bearing. Under the action of gravity, the ball bearing moves down along the receiving hole, and the part of the ball bearing protruding from the receiving hole abuts against the inclined surface of the limiting plate. At this time, the spring is compressed to generate a restoring force, and the inclined surface of the limiting plate pushes the ball bearing in the opposite direction against the inner wall of the rotating cylinder. The foot rest rotating component can rotate. In the locking state, when the foot rest rotating component rotates to align the limiting groove with the receiving hole, the restoring force drives the limiting plate and control lever to move in the opposite direction and uses the inclined surface to push the ball bearing from the receiving hole into the limiting groove, so that the corresponding limiting groove engages with the ball bearing, making the ball bearing stuck between the annular cylinder and the rotating cylinder. At this time, the foot rest rotating component and the support body remain relatively fixed.

2. The foot pedal adjustment device according to claim 1, characterized in that: The end of the support body is provided with a threaded hole, and the annular cylinder abuts against the end of the support body and is fixed by screws.

3. The foot pedal adjustment device according to claim 1, characterized in that: The end of the annular cylinder facing the support extends axially to have a root end. The root end has a channel to avoid the control rod. Both ends of the support have root end slots that match the shape of the root end. After the root end is inserted into the root end slot, the root end is circumferentially fixed to the support shaft, and the inner side of the annular cylinder abuts against the end of the support and is connected and fixed to the support.

4. The foot pedal adjustment device according to claim 3, characterized in that: The root end is flat, and the root end slots at both ends of the support body are flat insertion ports that match the shape of the root end. The annular cylinder has through slots and through holes where it matches the threaded hole. Screws are driven in through the through slots and through holes and the threaded hole to fix the support body to the annular cylinder.

5. The foot pedal adjustment device according to claim 1, characterized in that: The limit plate has a central hole, and the control rod is a hollow rod with screw holes at both ends. The limit plate rests against the end of the control rod, aligning the central hole with the screw holes and screwing in screws to fix the control rod and the limit plate together.

6. The foot pedal adjustment device according to claim 1, characterized in that: Two receiving holes and two balls are provided in the upper half of the annular cylinder. Three limiting grooves that cooperate with the balls are provided on the inner wall of the rotating cylinder. When the rotating cylinder and the annular cylinder are fixed relative to each other, two balls engage with two adjacent balls in the limiting grooves.

7. A foot pedal adjustment device according to claim 1, characterized in that: The support body is provided with a control unit, and control rods are located on the left and right sides of the control unit. The control unit includes a base and a button. The base is connected and fixed to the support body. The base is provided with a slide along the axial direction of the control rod. A connecting seat is provided in the slide. The connecting seat includes a connecting column connected to the control rod and a mating part that cooperates with the button. The button and the mating part are mated by an inclined surface. When the button is activated, it drives the mating part and the control rod to move along the slide.

8. A foot pedal adjustment device according to claim 7, characterized in that: The connecting column is hollow and has a pin opening along the radial direction. The control rod has a radial opening at a position that matches the pin opening. Inserting the pin connects the control rod to the connecting seat.

9. A foot pedal adjustment device according to claim 7, characterized in that: The support body has a button in the middle, and the base has several connecting holes around its perimeter. The support body has connecting threaded holes that match the connecting holes. After the base and the support body are connected by screws, the upper end of the button protrudes through the button slot.

10. A foot pedal adjustment device according to claim 7, characterized in that: Two control blocks are symmetrically arranged on the button, and a trapezoidal groove is opened on the mating part. The contact surface between the control block and the trapezoidal groove is an inclined surface.

11. A foot pedal adjustment device according to claim 1, characterized in that: Several sliding grooves are provided on the surface of the rotating cylinder that is in contact with the support body. Sliding balls are provided on the support body at positions that match the sliding grooves. When the rotating cylinder rotates, the sliding balls switch between different sliding grooves.

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