Quick folding wheelchair armrest and electric wheelchair

Abstract

The utility model discloses a quick folding wheelchair handrail and electric wheelchair belong to wheelchair technical field. The utility model discloses a quick folding wheelchair handrail, including handrail body, and handrail body can be relative wheelchair lateral movement to unlock and rotate folding along the front and back direction of wheelchair, and is equipped with the unlocking wrench and the ejection pin on handrail body, and the ejection pin is slidably installed in handrail body along the lateral of wheelchair, and one end of ejection pin can be opposite with the side of wheelchair, and the unlocking wrench is rotatably installed on handrail body, and the unlocking wrench has the ejection face of opposite with the other end of ejection pin on, and the ejection face can change the contact position with ejection pin with the rotation of unlocking wrench, and generates the reverse pushing effect to handrail body through ejection pin, and makes handrail body relative wheelchair lateral movement and unlocks folding. The utility model only needs to pull the unlocking wrench when operating, and the convenience of wheelchair handrail folding operation is greatly improved, and the operation is quick and labor saving.

Description

Technical Field

[0001] This utility model relates to a wheelchair, and more specifically, to a quick-folding wheelchair armrest and an electric wheelchair. Background Technology

[0002] A wheelchair is a device that helps people with mobility impairments to move independently or with assistance. It mainly consists of components such as a seat, wheels, armrests, and footrests. With the development of technology, wheelchairs are gradually moving towards electrification. Currently, electric wheelchairs, as an innovative tool for assisting travel, are increasingly becoming an important "partner" for the elderly and people with mobility impairments in pursuing an independent life.

[0003] Whether it's a regular wheelchair or an electric wheelchair, foldability has always been one of its main features for easy portability. Chinese Patent Publication No. CN221998225U discloses "A Foldable Electric Wheelchair" (publication date: November 15, 2024), whose armrest folding structure is as follows: the connecting end face of the armrest has a first limiting step and a second limiting step with different angles. The connecting end of the armrest is also provided with a rotating shaft that rotates and engages with the shaft hole on the corresponding side of the seat assembly. The free end of the rotating shaft passes through the shaft hole and is tightened by a spring, so that the connecting end face of the armrest is in a tight abutment state with the side wall of the seat assembly. When the first limiting step abuts with the side wall of the seat assembly, the armrest is in an unfolded state; when the second limiting step abuts with the side wall of the seat assembly, the armrest is in a folded state. Specifically, the second limiting step is higher than the first limiting step. The rotating shaft passes through the shaft hole on the corresponding side of the seat assembly. A spring is fitted at the protruding end of the rotating shaft, with one end of the spring abutting against the seat assembly and the other end against the limiting ring. The limiting ring is limited by a retaining ring that is locked onto the rotating shaft. In the unfolded state, the first limiting step abuts against the side wall of the seat assembly. When folding is required, the armrest is pulled outward to disengage the first limiting step from the side wall of the seat assembly. Then, the armrest is rotated backward to abut against the second limiting step against the side wall of the seat assembly, maintaining the folded state. This armrest folding structure is simple, compact, and easy to operate. However, in actual use, it was found that because the armrest needs to be pulled outward to overcome the spring force when folding, although the spring force is small and normal people can operate it easily, it is still relatively inconvenient for people with mobility impairments or weak constitutions, especially when folding the armrest while sitting in a wheelchair, where it is often difficult to apply force to pull the armrest outward to unlock and fold it.

[0004] Chinese Patent Publication No. CN222517184U discloses "An Electric Wheelchair and Wheelchair Armrest Mechanism" (publication date: February 25, 2025), which provides another armrest folding structure. It mainly includes a mounting base fixedly connected to a seat base, an armrest rotatably connected to the mounting base, a locking member for locking the armrest to the mounting base, and an unlocking member for unlocking the locking member. The armrest includes an armrest body and a rotating member connected to the armrest body. The rotating member is rotatably fitted onto the mounting base and has a locking groove with a locking area and a sliding area. The locking member is slidably disposed on the mounting base and has an outwardly protruding locking part that fits into the locking groove. The locking part is inserted into the locking groove and can switch between the locking area and the sliding area. When the locking member is in the locking area, it is in a locked state; when it is in the sliding area, it is in an unlocked state. The unlocking element is connected to the locking element and is at least partially exposed. When a certain force is applied to the unlocking element, it can cause the locking element to switch between the locking area and the sliding area. This armrest folding unlocking structure requires lateral pressing of the unlocking element, but in reality, it is still difficult for people sitting in wheelchairs to apply force from the outside of the armrest to press it, which makes the folding operation of the armrest somewhat inconvenient. Summary of the Invention

[0005] 1. Technical problem to be solved by the utility model

[0006] The purpose of this utility model is to overcome the shortcomings of existing wheelchair armrest folding structures, such as inconvenient folding and unlocking operations, and to provide a quick-folding wheelchair armrest and electric wheelchair. The technical solution of this utility model uses an unlocking lever on the armrest body to realize the folding and unlocking of the armrest. During operation, only the unlocking lever needs to be pulled, which changes the problem of the inconvenience of the existing side-pulling or side-pressing unlocking operation, greatly improving the convenience of the wheelchair armrest folding operation, and making the operation quick and effortless. In addition, the quick-folding wheelchair armrest has a simple and compact structure and is easy to install on the original wheelchair armrest.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] This utility model discloses a quick-folding wheelchair armrest, comprising an armrest body mounted on the side of the wheelchair. The armrest body is capable of moving laterally relative to the wheelchair to unlock and rotating and folding along the front-to-back direction of the wheelchair.

[0010] The armrest body is equipped with an unlocking lever and a push-out pin. The push-out pin is slidably installed in the armrest body along the side of the wheelchair. One end of the push-out pin can abut against the side of the wheelchair. The unlocking lever is rotatably installed on the armrest body. The unlocking lever has a push-out surface that abuts against the other end of the push-out pin. The push-out surface can change its contact position with the push-out pin as the unlocking lever rotates. The push-out pin generates a reverse pushing force on the armrest body, causing the armrest body to move laterally relative to the wheelchair and unlock and fold.

[0011] Furthermore, the handrail body has a movable slot, and the unlocking wrench has a pull rod extending from the movable slot to the outside of the handrail body.

[0012] Furthermore, the pull rod is located on the front side of the handrail body, and the unlocking pull direction of the pull rod is consistent with the folding and rotating direction of the handrail body.

[0013] Furthermore, one end of the armrest body is fixedly provided with a rotating shaft, and the side of the wheelchair seat plate is provided with a shaft hole. The armrest body is rotatably installed in the shaft hole of the seat plate through the rotating shaft. The free end of the rotating shaft passes through the shaft hole and is fitted with a spring. The spring is used to apply a tension force to the armrest body to press against the side wall of the seat plate. The side of the armrest body that presses against the side wall of the seat plate has a first limiting step and a second limiting step. The second limiting step protrudes laterally from the first limiting step. When the first limiting step abuts against the seat plate, the armrest body is in an unfolded state. After the armrest body moves laterally relative to the wheelchair to separate the first limiting step from the seat plate, the armrest body rotates and folds and is limited by the second limiting step against the seat plate.

[0014] Furthermore, the rotating shaft has a mounting shaft extending into the inner side of the armrest body, and the unlocking wrench has a rotating sleeve that is rotatably mounted on the mounting shaft.

[0015] Furthermore, the rotating sleeve is fitted onto the mounting shaft and is axially limited by a retaining ring and a fixing bolt located at the end of the mounting shaft.

[0016] Furthermore, the ejector surface is an axial inclined surface formed on the outer periphery of the rotating sleeve, the ejector pin is parallel to the rotating shaft, and one end of the ejector pin is in contact with the aforementioned axial inclined surface.

[0017] Furthermore, the outer side of the armrest body is also provided with a decorative cover for partially covering the unlocking wrench.

[0018] The present invention relates to an electric wheelchair having the aforementioned quick-folding wheelchair armrests.

[0019] Furthermore, it also includes a chassis, front wheels, rear wheels, a lifting and folding mechanism, a seat, and a backrest. The front wheels are omnidirectional wheels and are installed at the front of the chassis. The rear wheels are drive wheels and are installed at the rear of the chassis. The seat is mounted on the chassis via the lifting and folding mechanism. The backrest is hinged to the rear side of the seat. The aforementioned quick-folding wheelchair armrests are installed on the left and right sides of the seat. The lifting and folding mechanism's lifting actuator is a controllable support rod or an electric push rod.

[0020] 3. Beneficial effects

[0021] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0022] (1) The present invention provides a quick-folding wheelchair armrest, comprising an armrest body installed on the side of the wheelchair, the armrest body being able to move laterally relative to the wheelchair to unlock and rotate and fold along the front-back direction of the wheelchair; the armrest body is provided with an unlocking lever and a push-out pin, the push-out pin being slidably installed in the armrest body along the side of the wheelchair, one end of the push-out pin being able to abut against the side of the wheelchair, the unlocking lever being rotatably installed on the armrest body, the unlocking lever having a push-out surface abutting against the other end of the push-out pin, the push-out surface being able to change the contact position with the push-out pin as the unlocking lever rotates, and generating a reverse pushing force on the armrest body through the push-out pin, thereby causing the armrest body to move laterally relative to the wheelchair and unlock and fold; the unlocking lever provided on the armrest body is used to realize the folding and unlocking of the armrest, and only the unlocking lever needs to be pulled during operation, which changes the problem of the inconvenience of the existing side-pulling or side-pressing unlocking operation, greatly improving the convenience of the wheelchair armrest folding operation, and the operation is quick and labor-saving; and the quick-folding wheelchair armrest has a simple and compact structure, and is easy to install on the original wheelchair armrest;

[0023] (2) The present invention provides a quick-folding wheelchair armrest, wherein the armrest body has a movable slot, and the unlocking lever has a pull rod extending from the movable slot to the outside of the armrest body. The unlocking structure is hidden inside the armrest body, with only a portion of the operable pull rod being led out through the movable slot. The overall structure of the armrest is neat and the operation is flexible and convenient. Furthermore, the pull rod is located on the front side of the armrest body, and the unlocking pulling direction of the pull rod is consistent with the folding rotation direction of the armrest body. When the pull rod is pulled to unlock, the armrest can be rotated and folded in the same way, making the operation easier and more convenient.

[0024] (3) The present invention provides a quick-folding wheelchair armrest, wherein one end of the armrest body is fixedly provided with a rotating shaft, the side of the wheelchair seat is provided with a shaft hole, the armrest body is rotatably installed in the shaft hole of the seat through the rotating shaft, the free end of the rotating shaft passes through the shaft hole and is provided with a spring, the spring is used to apply a tension force to the armrest body to press against the side wall of the seat, the side of the armrest body that presses against the side wall of the seat has a first limiting step and a second limiting step, the second limiting step protrudes laterally from the first limiting step, when the first limiting step abuts against the seat, the armrest body is in the unfolded state; after the armrest body moves laterally relative to the wheelchair to separate the first limiting step from the seat, the armrest body rotates and folds and is limited by the second limiting step against the seat, the two limiting steps realize the stable limiting of the armrest in the unfolded state and the folded state, the structure is simple, and the folding and unfolding operation is simple and convenient;

[0025] (4) The present invention provides a quick-folding wheelchair armrest, wherein the rotating shaft has an installation shaft extending to the inner side of the armrest body, and the unlocking wrench has a rotating sleeve, which is rotatably mounted on the installation shaft. The original rotating shaft can be used to install the unlocking wrench, which is convenient to install. Furthermore, the axis of the unlocking wrench is coaxial or close to the rotating shaft, and the torque of the reverse pushing force generated by the rotation of the unlocking wrench is smaller, which can more easily overcome the tension of the spring, making the operation of the unlocking wrench easier and less strenuous.

[0026] (5) The present invention provides a quick-folding wheelchair armrest, which is rotated and sleeved on the mounting shaft, and is axially limited by the retaining ring and fixing bolt at the end of the mounting shaft, making the installation of the unlocking wrench simple and convenient, and the rotation flexible;

[0027] (6) The present invention provides a quick-folding wheelchair armrest, the top surface of which is an axial inclined surface formed on the outer circumference of the rotating sleeve. The top pin is parallel to the rotating shaft, and one end of the top pin is in contact with the aforementioned axial inclined surface. The axial inclined surface can generate an axial thrust on the top pin when the unlocking wrench is rotated. The gradient change size of the axial inclined surface is just greater than the lateral movement distance required for unlocking the armrest, which can ensure that the armrest can be quickly and stably unlocked and folded. Furthermore, the axial inclined surface transition is smooth, making the unlocking wrench rotation operation smoother. In addition, when the armrest is unfolded, as the armrest is pulled back by the spring, the unlocking wrench can automatically reset under the cooperation of the axial inclined surface and the top pin.

[0028] (7) The present invention provides a quick-folding wheelchair armrest, wherein the outer side of the armrest body is provided with a decorative cover for partially covering the unlocking lever, which protects the internal structure of the armrest and ensures the simplicity of the outer structure of the armrest.

[0029] (8) An electric wheelchair of the present invention has the above-mentioned quick-folding wheelchair armrests, which makes the folding and unfolding operation of the electric wheelchair more convenient and further improves the ease of use of the electric wheelchair. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the installation structure of a quick-folding wheelchair armrest according to the present invention on a wheelchair;

[0031] Figure 2 This is a schematic diagram of the overall structure of a quick-folding wheelchair armrest according to the present invention;

[0032] Figure 3 This is a schematic diagram of the disassembled structure of a quick-folding wheelchair armrest and wheelchair according to the present invention;

[0033] Figure 4 This is a schematic diagram showing the internal structure of a quick-folding wheelchair armrest according to the present invention.

[0034] Figure 5 This is a schematic diagram of the structure of an unlocking wrench in a quick-folding wheelchair armrest according to the present invention;

[0035] Figure 6 This is an internal cross-sectional view of the quick-folding wheelchair armrest of this utility model in its unfolded state;

[0036] Figure 7 This is an internal cross-sectional view of the quick-folding wheelchair armrest of this utility model in the folded and unlocked state;

[0037] Figure 8 This is a structural schematic diagram of an electric wheelchair according to the present invention.

[0038] Explanation of the labels in the diagram:

[0039] 100. Folding wheelchair armrest; 101. Armrest body; 101a. Movable slot; 101b. Guide hole; 102. Unlocking lever; 102a. Pull rod; 102b. Rotating sleeve; 102c. Top protrusion surface; 103. Rotating shaft; 103a. Mounting shaft; 104. Spring; 105. First limiting step; 106. Second limiting step; 107. Top protrusion pin; 108. Decorative cover; 109. Retaining ring; 110. Fixing bolt;

[0040] 200. Wheelchair; 201. Chassis; 201a. Battery pack; 201b. Storage compartment; 202. Front wheel; 203. Rear wheel; 204. Foot pedal; 205. Lifting and folding mechanism; 206. Seat; 206a. Shaft hole; 207. Backrest. Detailed Implementation

[0041] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0042] [Example 1]

[0043] Combination Figures 1 to 7 As shown, this embodiment of a quick-folding wheelchair armrest 100 includes an armrest body 101 mounted on the side of a wheelchair 200 for supporting the arm of the wheelchair user. The armrest body 101 can move laterally relative to the wheelchair 200 to unlock and rotate and fold along the front-back direction of the wheelchair 200. The front-back direction of the wheelchair 200 is the direction of travel of the wheelchair, and the lateral direction of the wheelchair 200 is the left-right direction perpendicular to the front-back direction. That is, the armrest body 101 has the following folding and unlocking structure features: when folding the armrest, it is necessary to push the armrest to the outside (left or right) of the wheelchair 200 to the unlocking position. At this time, the rotation and folding path of the armrest is released, and the armrest body 101 can be folded forward or backward. After folding, the armrest body 101 flips back and forth and is located on the side of the wheelchair 200. This folding and unlocking structure of the armrest body 101 can be implemented by existing mechanical structures.

[0044] Based on the folding and unlocking features of the armrest body 101, an unlocking lever 102 and a push-out pin 107 are provided on the armrest body 101. The push-out pin 107 is slidably installed inside the armrest body 101 along the side of the wheelchair 200, as detailed below. Figure 4As shown, a guide hole 101b is provided on the armrest body 101, and an ejector pin 107 is movably inserted into the guide hole 101b. One end of the ejector pin 107 can abut against the side of the wheelchair 200. An unlocking wrench 102 is rotatably mounted on the armrest body 101. The unlocking wrench 102 has an ejector surface 102c that abuts against the other end of the ejector pin 107. The ejector surface 102c can change its contact position with the ejector pin 107 as the unlocking wrench 102 rotates, and the ejector pin 107 generates a reverse pushing force on the armrest body 101, thereby causing the armrest body 101 to move laterally relative to the wheelchair 200 and unlock and fold. In other words, the ejector pin 107 acts as a force transmitter. When the unlocking lever 102 is turned, the ejector surface 102c presses against the ejector pin 107. Since the other end of the ejector pin 107 is blocked by the side of the wheelchair 200, the ejector pin 107 does not move at this time, but provides a reverse thrust to the ejector surface 102c, causing the unlocking lever 102 to move laterally along with the armrest body 101. The movement distance is slightly greater than the lateral movement distance required for unlocking the armrest, thus enabling the armrest body 101 to unlock and fold. It should be understood that during the folding or unfolding of the armrest body 101, the ejector pin 107 is always blocked and limited by the side of the wheelchair 200. When the armrest body 101 is unfolded again, as the armrest body 101 is pulled back to its original position, the ejector pin 107 can drive the unlocking lever 102 to reset synchronously. Of course, the reset of the unlocking lever 102 can also be achieved by adding a reset spring or a torsion spring.

[0045] The aforementioned quick-folding wheelchair armrest utilizes an unlocking lever 102 located on the armrest body 101 to achieve folding and unlocking. During operation, only the unlocking lever 102 needs to be turned, which eliminates the inconvenience of the existing side-pulling or side-pressing unlocking operation, greatly improving the convenience of wheelchair armrest folding operation, and making the operation quick and effortless. Furthermore, the quick-folding wheelchair armrest has a simple and compact structure, making it easy to install on existing wheelchair armrests.

[0046] like Figure 2As shown, in this embodiment, the handrail body 101 has a movable slot 101a, and the unlocking lever 102 has a pull rod 102a extending from the movable slot 101a to the outside of the handrail body 101. The range of motion of the pull rod 102a can be constrained by the movable slot 101a, thereby controlling the pulling amplitude of the pull rod 102a. The unlocking structure is entirely hidden inside the handrail body 101, with only a portion of the operable pull rod 102a extending out through the movable slot 101a. The overall structure of the handrail is neat, and the operation is flexible and convenient. Furthermore, the pull rod 102a is located on the front side of the handrail body 101, and the unlocking pulling direction of the pull rod 102a is consistent with the folding and rotating direction of the handrail body 101. The lever 102a is positioned at the front of the armrest body 101, allowing for easy one-handed operation while seated in a wheelchair. Furthermore, the unlocking direction of the lever 102a aligns with the folding direction of the armrest body 101, enabling the armrest to fold and rotate smoothly when the lever 102a is pulled, making operation easier and more convenient. Specifically, when the armrest body 101 folds forward, the unlocking direction of the lever 102a is downward; when the armrest body 101 folds backward, the unlocking direction of the lever 102a is upward. In this embodiment, for example… Figure 1 and Figure 2 As shown, the preferred unlocking method is to pull the lever 102a upwards. At this point, the armrest body 101 folds backwards. During operation, the lever 102a can be pulled with one hand to move the armrest body 101 laterally to unlock it. Simultaneously, the unlocked armrest body 101 can be rotated backwards to complete the folding of the armrest. When unfolding the armrest, there is no need to operate the unlocking lever 102; the armrest body 101 can be directly flipped forward to unfold it.

[0047] [Example 2]

[0048] This embodiment of a quick-folding wheelchair armrest has the same basic structure and working principle as Embodiment 1, but the difference is:

[0049] like Figure 2 and Figure 3 As shown, in this embodiment, the folding and unlocking structure of the armrest body 101 is as follows:

[0050] A rotating shaft 103 is fixedly provided at one end of the armrest body 101. A shaft hole 206a is provided on the side of the seat plate 206 of the wheelchair 200. The armrest body 101 is rotatably installed in the shaft hole 206a of the seat plate 206 via the rotating shaft 103. A spring 104 is installed after the free end of the rotating shaft 103 passes through the shaft hole 206a. The spring 104 is used to apply a tension force to the armrest body 101 to press against the side wall of the seat plate 206. The armrest body 101 is in contact with the side wall of the seat plate 206. The armrest body 101 has a first limiting step 105 and a second limiting step 106 on the tight side. The second limiting step 106 protrudes laterally from the first limiting step 105. When the first limiting step 105 abuts against the seat plate 206, the armrest body 101 is in the unfolded state. After the armrest body 101 moves laterally relative to the wheelchair 200, causing the first limiting step 105 to separate from the seat plate 206, the armrest body 101 rotates and folds, and is then stopped by the second limiting step 106 abutting against the seat plate 206. The two limiting steps achieve stable positioning of the armrest in both the unfolded and folded states, resulting in a simple structure and easy and convenient folding and unfolding operations. Specifically, when the armrest body 101 is in the unfolded state, the first limiting step 105 abuts against the side edge of the seat plate 206, preventing the armrest body 101 from rotating around the rotation axis 103. When folding is required, the unlocking lever 102 is moved to move the armrest body 101 outward, causing the first limiting step 105 to separate from the side edge of the seat plate 206. At this time, the armrest body 101 can rotate around the rotation axis 103 to fold. When the armrest body 101 is folded into place, the second limiting step 106 abuts against the side edge of the seat plate 206, keeping the armrest body 101 stably in the folded position.

[0051] Further reference Figure 4As shown, the aforementioned rotating shaft 103 has a mounting shaft 103a extending to the inner side of the handrail body 101. The mounting shaft 103a can be coaxially or slightly eccentrically arranged with the rotating shaft 103. The unlocking wrench 102 has a rotating sleeve 102b, which is rotatably mounted on the mounting shaft 103a, allowing the unlocking wrench 102 to rotate freely under the support of the mounting shaft 103a. Using this structure, the original rotating shaft 103 can be used to install the unlocking wrench 102 on the handrail body 101, making installation convenient. Furthermore, since the axis of the unlocking wrench 102 is coaxial with or close to the rotating shaft 103, the torque of the reverse pushing force generated by the rotation of the unlocking wrench 102 is smaller, making it easier to overcome the tension of the spring 104, thus making the operation of the unlocking wrench 102 easier and less strenuous. To facilitate the installation of the unlocking wrench 102, the rotating sleeve 102b is fitted onto the mounting shaft 103a and is axially limited by the retaining ring 109 and the fixing bolt 110 located at the end of the mounting shaft 103a. The fixing bolt 110 fixes the retaining ring 109 to the end of the mounting shaft 103a, thereby axially limiting the rotating sleeve 102b. This ensures that the unlocking wrench 102 is stably installed on the mounting shaft 103a, making installation simple and convenient, and allowing for flexible rotation.

[0052] Specific reference Figure 5 As shown, the aforementioned ejector surface 102c is an axial inclined surface formed on the outer periphery of the rotating sleeve 102b. The ejector pin 107 is parallel to the rotating shaft 103, and one end of the ejector pin 107 contacts and engages with the aforementioned axial inclined surface. The axial inclined surface generates an axial thrust on the ejector pin 107 when the unlocking lever 102 rotates. The gradient change dimension of the axial inclined surface is just greater than the lateral movement distance required for unlocking the armrest, ensuring the armrest can be quickly and stably unlocked and folded. Furthermore, the smooth transition of the axial inclined surface makes the rotation of the unlocking lever 102 smoother. Additionally, when the armrest is unfolded, as the armrest is pulled back by the spring 104, the unlocking lever 102 can automatically reset under the cooperation of the axial inclined surface and the ejector pin 107. Figure 3 and Figure 4 As shown, the outer side of the handrail body 101 is also provided with a decorative cover 108 for partially covering the unlocking lever 102, which protects the internal structure of the handrail and ensures the simplicity of the outer structure of the handrail.

[0053] Figure 6 and Figure 7 The two different states of the aforementioned quick-folding wheelchair armrests are shown, in which... Figure 6 This is an internal cross-sectional view of the quick-folding wheelchair armrest in its unfolded state. Figure 7 This is an internal cross-sectional view of the quick-folding wheelchair armrest in its folded / unfolded state. Figure 6As shown, in the extended state of the armrest, the spring 104 acts on the rotating shaft 103 to apply axial tension, causing the armrest body 101 to be tightly pressed against one side of the seat plate 206. At this time, the first limiting step 105 abuts against the side edge of the seat plate 206, keeping the armrest in the extended state, and one end of the ejector pin 107 is located at the bottom of the ejector surface 102c. Figure 7 As shown, when the lever 102a is pulled to rotate in the w direction, the contact position between the ejector surface 102c and the ejector pin 107 gradually increases, pushing the other end of the ejector pin 107 to abut against the side wall of the seat plate 206. Under the reaction force of the ejector pin 107, the unlocking wrench 102 is subjected to a reverse thrust, causing the armrest body 101 to move along the s direction, compressing the spring 104. When the first limiting step 105 separates from the side edge of the seat plate 206, the armrest body 101 can rotate around the rotation axis 103 to fold. Similarly, when the armrest body 101 switches from the folded state to the unfolded state, under the pulling force of the spring 104, when the first limiting step 105 corresponds to the side edge of the seat plate 206, the armrest body 101 is reset and locked in the unfolded state again. During the unfolding and resetting process of the armrest body 101, the ejector pin 107 abuts against the ejector surface 102c. Under the action of the axial inclined surface, the unlocking wrench 102 is also reset, ready for the next pull of the unlocking wrench 102 to perform the folding operation of the armrest.

[0054] [Example 3]

[0055] This embodiment discloses an electric wheelchair. The electric wheelchair features the quick-folding armrests of Embodiment 1 or Embodiment 2 described above, making the folding and unfolding operations of the electric wheelchair more convenient and further improving its usability.

[0056] like Figure 8As shown, the electric wheelchair of this embodiment also includes a chassis 201, front wheels 202, rear wheels 203, a lifting and folding mechanism 205, a seat 206, and a backrest 207. The front wheels 202 are omnidirectional wheels and are installed at the front of the chassis 201. The rear wheels 203 are drive wheels and are installed at the rear of the chassis 201. The seat 206 is mounted on the chassis 201 via the lifting and folding mechanism 205. The backrest 207 is hinged to the rear side of the seat 206. The aforementioned quick-folding wheelchair armrests 100 are respectively installed on the left and right sides of the seat 206. The lifting and folding mechanism 205's lifting actuator is a controllable support rod or an electric push rod. A battery pack 201a for powering the electric wheelchair is installed on one side of the chassis 201, and a storage compartment 201b is installed on the other side. The storage compartment 201b can hold water cups, folding umbrellas, etc. Both the battery pack 201a and the storage compartment 201b are horizontally installed, and their symmetrical arrangement is preferable. A foot pedal 204 is also provided at the front end of the chassis 201. Other structures of this electric wheelchair can be found in "A Foldable Electric Wheelchair" (patent number 202323583079.9) published in Chinese Patent Publication No. CN221998225U, which will not be repeated here.

[0057] This utility model discloses a quick-folding wheelchair armrest and an electric wheelchair. It utilizes an unlocking lever on the armrest body to achieve folding and unlocking of the armrest. During operation, only the unlocking lever needs to be pulled, which changes the inconvenience of the existing side-pulling or side-pressing unlocking operation, greatly improving the convenience of wheelchair armrest folding operation, and making the operation quick and effortless. In addition, the quick-folding wheelchair armrest has a simple and compact structure, and is easy to install on the original wheelchair armrest.

[0058] 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 quick-folding wheelchair armrest, comprising an armrest body (101) mounted on the side of a wheelchair (200), the armrest body (101) being capable of lateral movement relative to the wheelchair (200) to unlock and folding in the front-rear direction of the wheelchair (200), characterized in that: The armrest body (101) is provided with an unlocking lever (102) and an ejector pin (107). The ejector pin (107) is slidably installed in the armrest body (101) along the side of the wheelchair (200). One end of the ejector pin (107) can abut against the side of the wheelchair (200). The unlocking lever (102) is rotatably installed on the armrest body (101). The unlocking lever (102) has an ejector surface (102c) that abuts against the other end of the ejector pin (107). The ejector surface (102c) can change its contact position with the ejector pin (107) as the unlocking lever (102) rotates. The ejector pin (107) generates a reverse pushing force on the armrest body (101), causing the armrest body (101) to move laterally relative to the wheelchair (200) and unlock and fold.

2. The quick-folding wheelchair armrest according to claim 1, characterized in that: The handrail body (101) has a movable slot (101a), and the unlocking wrench (102) has a pull rod (102a) extending from the movable slot (101a) to the outside of the handrail body (101).

3. The quick-folding wheelchair armrest according to claim 2, characterized in that: The pull rod (102a) is located on the front side of the handrail body (101), and the unlocking pull direction of the pull rod (102a) is consistent with the folding and rotating direction of the handrail body (101).

4. The quick-folding wheelchair armrest according to claim 1, 2, or 3, characterized in that: One end of the armrest body (101) is fixedly provided with a rotating shaft (103). The side of the seat plate (206) of the wheelchair (200) is provided with a shaft hole (206a). The armrest body (101) is rotatably installed in the shaft hole (206a) of the seat plate (206) via the rotating shaft (103). The free end of the rotating shaft (103) passes through the shaft hole (206a) and is fitted with a spring (104). The spring (104) is used to apply a tension force to the armrest body (101) to press against the side wall of the seat plate (206). The armrest body (101) and the seat plate (206) are connected. The side of the armrest that is close to the wheelchair has a first limiting step (105) and a second limiting step (106). The second limiting step (106) protrudes laterally from the first limiting step (105). When the first limiting step (105) abuts against the seat (206), the armrest body (101) is in an unfolded state. After the armrest body (101) moves laterally relative to the wheelchair (200) to separate the first limiting step (105) from the seat (206), the armrest body (101) rotates and folds and is limited by the second limiting step (106) abutting against the seat (206).

5. The quick-folding wheelchair armrest according to claim 4, characterized in that: The rotating shaft (103) has a mounting shaft (103a) extending to the inside of the armrest body (101), and the unlocking wrench (102) has a rotating sleeve (102b) which is rotatably mounted on the mounting shaft (103a).

6. The quick-folding wheelchair armrest according to claim 5, characterized in that: The rotating sleeve (102b) is fitted onto the mounting shaft (103a) and is axially limited by the retaining ring (109) and the fixing bolt (110) located at the end of the mounting shaft (103a).

7. The quick-folding wheelchair armrest according to claim 5, characterized in that: The ejector surface (102c) is an axial inclined surface formed on the outer periphery of the rotating sleeve (102b). The ejector pin (107) is parallel to the rotating shaft (103), and one end of the ejector pin (107) is in contact with the aforementioned axial inclined surface.

8. The quick-folding wheelchair armrest according to claim 5, characterized in that: The outer side of the armrest body (101) is also provided with a decorative cover (108) for partially covering the unlocking lever (102).

9. An electric wheelchair, characterized in that: It has a quick-folding wheelchair armrest as described in any one of claims 1 to 8.

10. The electric wheelchair according to claim 9, characterized in that: It also includes a chassis (201), front wheels (202), rear wheels (203), a lifting and folding mechanism (205), a seat plate (206), and a backrest (207). The front wheels (202) are omnidirectional wheels and are installed at the front of the chassis (201). The rear wheels (203) are drive wheels and are installed at the rear of the chassis (201). The seat plate (206) is installed on the chassis (201) through the lifting and folding mechanism (205). The backrest (207) is hinged to the rear side of the seat plate (206). The aforementioned quick-folding wheelchair armrests (100) are installed on the left and right sides of the seat plate (206). The lifting and folding mechanism (205) has a controllable support rod or an electric push rod as its lifting actuator.

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