Locking mechanism for locking automatic driving type wheelchair

Abstract

The invention relates to the field of automatic wheelchairs, in particular to a locking mechanism for locking an automatic driving type wheelchair. The wheelchair matching base assembly comprises a bottom plate, a wheelchair mounting part and a connecting rod for connecting the bottom plate and the wheelchair mounting part; the locking mechanism comprises a limiter base, a limiter upper cover and a power mechanism; the limiting stopper upper cover is obliquely matched on the limiting stopper base in a sliding manner, and a clamping space for clamping the bottom plate is formed between the limiting stopper upper cover and the limiting stopper base; when the limiter upper cover obliquely slides in the extending direction, the height of the clamping space is gradually increased until the bottom plate is allowed to enter the clamping space; when the base plate obliquely slides in the back-off direction, the height of the clamping space is gradually reduced till the base plate is clamped; the limiter upper cover is provided with a V-shaped guide part and a strip-shaped constraint groove; the power mechanism is arranged between the limiting stopper base and the limiting stopper upper cover. According to the self-driving type wheelchair locking device, locking of the self-driving type wheelchair can be conveniently achieved, loss does not exist, operation is easy to implement, the retaining and locking process is soft, and too large vibration and jolt are avoided.

Description

Technical Field

[0001] The present invention relates to the field of automatic wheelchairs, and in particular to a locking mechanism for locking an automatic driving wheelchair. Background Art

[0002] A wheelchair locking mechanism is a device used to lock a wheelchair. With the continuous advancement of science and technology, wheelchair locking mechanisms are becoming more and more reliable. Existing wheelchair locking mechanisms usually achieve the purpose of locking and limiting by means of friction locks or lever locks.

[0003] Friction locks usually consist of a fixed rod and a friction pad. When the rod is pushed down and in close contact with the ground, friction prevents the wheelchair from moving. Therefore, the friction surface is easily worn. After long-term use, the friction may decrease, resulting in poor locking effect. Lever locks use the lever principle to make the locking rod contact the ground to lock the wheelchair. The structure of the lever lock is usually more complicated, which increases the difficulty of manufacturing and maintenance, and also leads to increased costs. In addition, it needs to withstand greater forces during use, so its components are easily damaged, especially key components such as the lever handle and the lock tongue, which may need to be replaced frequently. In addition, whether it is a friction lock or a lever lock, it is a rigid lock.

[0004] Therefore, it is necessary to design a better locking mechanism for locking the automatic driving wheelchair. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a locking mechanism for locking an automatic driving wheelchair, which can easily lock the automatic driving wheelchair without any loss, is easy to operate, and has a relatively gentle stopping and locking process without causing too much vibration or bumps.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a locking mechanism for locking an autonomous driving wheelchair, used to lock a wheelchair matching base assembly of the autonomous driving wheelchair, the wheelchair matching base assembly comprising a bottom plate, a wheelchair mounting portion and a connecting rod connected between the bottom plate and the wheelchair mounting portion;

[0007] The locking mechanism includes a limiter base, a limiter upper cover and a power mechanism;

[0008] The upper cover of the stopper is tilted and slidably mounted on the base of the stopper, and together with the base of the stopper, a clamping space for clamping the bottom plate is formed;

[0009] When the upper cover of the stopper tilts and slides along the extension direction, the height of the clamping space gradually increases to allow the bottom plate to enter the clamping space; when the upper cover of the stopper tilts and slides along the retraction direction, the height of the clamping space gradually decreases to clamp the bottom plate;

[0010] The upper cover of the limiter is provided with a V-shaped guide portion and a strip-shaped constraint groove, and the V-shaped guide portion is used to guide the connecting rod to enter the strip-shaped constraint groove;

[0011] The power mechanism is arranged between the stopper base and the stopper upper cover, and is used for driving the stopper upper cover to slide.

[0012] In order to further better limit the position of the wheelchair and the base assembly in the X and Y directions, the locking mechanism for locking the automatic driving wheelchair also includes an ejection locking mechanism and an induction trigger mechanism. The base plate is provided with a locking hole, and the induction trigger mechanism is connected to the ejection locking mechanism, which is used to trigger the ejection locking mechanism to eject and embed into the locking hole when the base plate is sensed to move into position in the clamping space.

[0013] A specific structure of an ejection locking structure is further provided, wherein the ejection locking mechanism is an electromagnet lock.

[0014] A specific structure of an induction trigger mechanism is further provided, wherein the induction trigger mechanism is a proximity sensor.

[0015] A tilted sliding installation method for the upper cover of the limiter is further provided, wherein oblique grooves are respectively arranged on both sides of the limiter base, and matching rods are respectively installed on both sides of the upper cover of the limiter, and the matching rods are slidably installed in the oblique grooves.

[0016] In order to better control the timing of starting the retraction of the power mechanism when the power mechanism is actively retracted, the locking mechanism for locking the automatic driving wheelchair further includes a pressure sensor and a controller, wherein the pressure sensor is arranged at the end of the strip constraint groove and is used to detect the collision force between the connecting rod and the end of the strip constraint groove;

[0017] The controller is connected to the pressure sensor and the power mechanism respectively, and is used to control the power mechanism to drive the upper cover of the limiter to tilt and slide along the retreat direction when receiving the collision force.

[0018] In order to further prevent the automatic driving wheelchair from reaching the end of the bar-shaped restraint groove at an excessive speed, the locking mechanism for locking the automatic driving wheelchair further includes a speed sensor and a controller; wherein,

[0019] The speed sensor is used to detect the speed of the automatic driving wheelchair in a preset range;

[0020] The controller is connected to the speed sensor and the automatic driving wheelchair respectively, and is used to control the automatic driving wheelchair to decelerate when the speed of the automatic driving wheelchair is greater than a preset speed value.

[0021] A possible structure of the power mechanism is further provided, wherein the power mechanism is a gas spring or a push rod mechanism.

[0022] To further facilitate the insertion of the bottom plate into the clamping space, the end of the bottom plate facing the retraction direction of the limiter upper cover is V-shaped, and the sharp corner of the V-shape faces the retraction direction of the limiter upper cover.

[0023] After adopting the above technical solution, the present invention has the following beneficial effects:

[0024] 1. When the automatic driving wheelchair needs to be fixed, the power mechanism first drives the upper cover of the limiter to slide obliquely along the extension direction. While the upper cover of the limiter extends forward, the height of the clamping space formed by the upper cover of the limiter and the base of the limiter gradually increases. After the automatic driving wheelchair moves over, the connecting rod of the wheelchair matching base assembly follows the guide of the V-shaped guide part on the upper cover of the limiter and enters the strip constraint groove. When the automatic driving wheelchair moves to the end of the strip constraint groove, the upper cover of the limiter retreats under the triggering of the connecting rod. In this process, the automatic driving wheelchair continues to move with the retreat of the upper cover of the limiter until the clamping space formed by the upper cover of the limiter and the base of the limiter clamps the bottom plate of the wheelchair matching base assembly. In this way, the wheelchair matching base assembly is locked, and the whole process is simple and reliable.

[0025] 2. The structure of the entire locking mechanism is relatively simple, with low cost and easy operation and maintenance;

[0026] 3. Since the upper cover of the limiter first extends forward and then retreats together with the automatic driving wheelchair, the present invention can well play a damping and stopping role for the wheelchair and the base assembly 1. The stopping distance is relatively long and the stopping process is relatively gentle, which will not cause a large vibration or bump to the wheelchair and the base assembly or even the entire automatic driving wheelchair. The locking is achieved while stopping and retreating, and the whole process is rapid and reliable.

[0027] 4. In the present invention, the upper cover of the limiter adopts an inclined sliding motion, which saves more space and makes the entire locking mechanism compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the wheelchair and base assembly of the automatic driving wheelchair locked by the locking mechanism for locking the automatic driving wheelchair of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a locking mechanism for locking an automatic driving wheelchair of the present invention;

[0030] Figure 3 for Figure 2 A top view of

[0031] Figure 4 It is a schematic diagram of the structure of the upper cover of the limiter of the present invention;

[0032] Figure 5 It is a schematic diagram of the internal structure of the limiter base of the present invention;

[0033] Figure 6 It is a schematic structural diagram of a wheelchair and a base assembly of the present invention;

[0034] In the figure, 1. wheelchair matching base assembly; 11. bottom plate; 111. locking hole; 12. connecting rod; 13. wheelchair mounting part; 2. limiter base; 21. inclined groove; 22. cover plate; 3. limiter upper cover; 31. V-shaped guide part; 32. strip constraint groove; 4. power mechanism; 5. ejection locking mechanism; 6. induction trigger mechanism; 7. matching rod. DETAILED DESCRIPTION

[0035] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] like Figures 1 to 6 As shown, a locking mechanism for locking an automatic driving wheelchair is used to lock a wheelchair matching base assembly 1 of the automatic driving wheelchair, the wheelchair matching base assembly 1 includes a bottom plate 11, a wheelchair mounting portion 13 and a connecting rod 12 connected between the bottom plate 11 and the wheelchair mounting portion 13; the locking mechanism includes a limiter base 2, a limiter upper cover 3 and a power mechanism 4;

[0038] The upper cover 3 of the stopper is slidably mounted on the base 2 of the stopper, and together with the base 2 of the stopper, a clamping space for clamping the bottom plate 11 is formed;

[0039] When the upper cover 3 of the stopper tilts and slides along the extension direction, the height of the clamping space gradually increases to allow the bottom plate 11 to enter the clamping space; when the upper cover 3 of the stopper tilts and slides along the retraction direction, the height of the clamping space gradually decreases to clamp the bottom plate 11;

[0040] The upper cover 3 of the limiter is provided with a V-shaped guide portion 31 and a strip-shaped constraint groove 32. The V-shaped guide portion 31 is used to guide the connecting rod 12 to enter the strip-shaped constraint groove 32.

[0041] The power mechanism 4 is arranged between the stopper base 2 and the stopper upper cover 3 and is used for driving the stopper upper cover 3 to slide.

[0042] Specifically, when the automatic driving wheelchair needs to be fixed, the power mechanism 4 first drives the limiter upper cover 3 to slide obliquely along the extension direction. While the limiter upper cover 3 extends forward, the height of the clamping space formed together with the limiter base 2 gradually increases. After the automatic driving wheelchair moves over, the connecting rod 12 of the wheelchair matching base assembly 1 follows the guidance of the V-shaped guide part 31 on the limiter upper cover 3 and enters the strip constraint groove 32. When the automatic driving wheelchair moves until the connecting rod 12 reaches the end of the strip constraint groove 32, the limiter upper cover 3 retreats under the triggering of the connecting rod 12. In this process, the automatic driving wheelchair continues to move with the retreat of the limiter upper cover 3 until the clamping space formed together with the limiter base 2 clamps the wheelchair matching base The bottom plate 11 of the seat assembly 1, in this way, the wheelchair is locked with the base assembly 1, the whole process is simple and reliable, the structure of the whole locking mechanism is also relatively simple, the use cost is low, and it is easy to operate and maintain; and, because the limiter upper cover 3 is first extended forward and then retreats together with the automatic driving wheelchair, therefore, the present embodiment can well play a damping and stopping role for the wheelchair to cooperate with the base assembly 1, the stopping distance is relatively long, and the stopping process is relatively gentle, so as not to cause large vibration and bumping of the wheelchair and the base assembly 1 or even the entire automatic driving wheelchair, and locking is achieved while stopping and retreating, and the whole process is rapid and reliable; in addition, in the present embodiment, the limiter upper cover 3 adopts inclined sliding, which saves more space and makes the structure of the whole locking mechanism compact.

[0043] In this embodiment, an inclined slide rail can be provided on the stopper base 2, and the stopper upper cover 3 is provided with a slider matched with the slide rail, and the slider is slidably installed on the slide rail. Figure 1 , Figure 2 and Figure 5 As shown, oblique grooves 21 are respectively provided on both sides of the stopper base 2, and two oblique grooves 21 can be provided on each side. Matching rods 7 are respectively installed on both sides of the stopper upper cover 3, and the matching rods 7 are slidably installed in the oblique grooves 21. When installing the matching rod 7, first let the matching rod 7 pass through the through hole on the stopper upper cover 3 and the corresponding oblique groove 21 at the same time, and then screw the nut at the end, and the nut plays a blocking role to prevent the matching rod 7 from being separated from the oblique groove 21 and the through hole.

[0044] In this embodiment, the power mechanism 4 can be a gas spring or a push rod mechanism, etc., and there are various structures.

[0045] When the power mechanism 4 is a gas spring, when the gas spring is released, the gas spring pushes the limiter upper cover 3 to slide obliquely along the extension direction by extending. When the connecting rod 12 of the wheelchair matching base assembly 1 collides with the end of the strip constraint groove 32, the gas spring retracts under the action of the collision. During the retraction process, the gas spring can play a good buffering and braking role on the wheelchair matching base assembly 1.

[0046] When the power mechanism 4 is a push rod mechanism, such as an electric hydraulic push rod, a pressure sensor can be configured at the end of the strip constraint groove 32. When the pressure sensor detects the collision force between the connecting rod 12 and the end of the strip constraint groove 32, the controller controls the power mechanism 4 to drive the limiter cover 3 to slide in an inclined manner in the retreat direction. A position detection sensor can also be provided. When it is detected that the connecting rod 12 reaches a preset position, the controller controls the power mechanism 4 to drive the limiter cover 3 to start.

[0047] That is to say, the power mechanism 4 can be passively retreated, or actively drive the limiter cover 3 to retreat, and there are many types. In either case, it is necessary to ensure that the connecting rod 12 retreats synchronously with the limiter cover 3 after contacting the end of the strip constraint groove 32.

[0048] In this embodiment, preferably, the end of the bottom plate 11 facing the retraction direction of the stopper upper cover 3 is V-shaped, and the sharp corner of the V-shape faces the retraction direction of the stopper upper cover 3. The corresponding end of the bottom plate 11 is set to be V-shaped, which facilitates the bottom plate 11 to smoothly enter the clamping space and has a larger tolerance space.

[0049] Embodiment 2

[0050] Based on the first embodiment, Figure 1 , Figure 2 and Figure 5 As shown, the locking mechanism for locking the automatic driving wheelchair also includes an ejection locking mechanism 5 and an induction triggering mechanism 6; wherein,

[0051] The bottom plate 11 is provided with a locking hole 111 , and the induction trigger mechanism 6 is connected to the ejection locking mechanism 5 , and is used to trigger the ejection locking mechanism 5 to be ejected and embedded in the locking hole 111 when the induction bottom plate 11 moves into position in the clamping space.

[0052] Specifically, considering that the strip constraint groove 32 and the connecting rod 12 are loosely fitted, the reliability of relying on the limiter upper cover 3 to press the base plate 11 is not high. Therefore, the locking can be further achieved by embedding the ejection locking mechanism 5 with the locking hole 111. In this way, the base plate 11 can be fully locked in the Z, X and Y directions, thereby improving the reliability of the locking.

[0053] like Figure 1 , Figure 2 and Figure 5 As shown, the ejection locking mechanism 5 can be an electromagnet lock. Of course, it can also be an electric push rod, etc. Figure 5 As shown, the induction trigger mechanism 6 is a proximity sensor, and may also be a micro switch or the like.

[0054] It should be noted that the above provides a signal linkage method to achieve the coordination between the sensing tactile mechanism 6 and the ejection locking mechanism 5 , and the sensing tactile mechanism 6 and the ejection locking mechanism 5 can also be coordinated by mechanical linkage.

[0055] In this embodiment, the limiter base 2 includes a base body and a cover plate 22 , and the ejection locking mechanism 5 , the induction trigger mechanism 6 and the power mechanism 4 are all installed in a space formed by the base body and the cover plate 22 .

[0056] Embodiment 3

[0057] Based on the first or second embodiment, the locking mechanism for locking the automatic driving wheelchair further includes a speed sensor and a controller;

[0058] The speed sensor is used to detect the speed of the automatic driving wheelchair in a preset range;

[0059] The controller is connected to the speed sensor and the automatic driving wheelchair respectively, and is used to control the automatic driving wheelchair to decelerate when the speed of the automatic driving wheelchair is greater than a preset speed value.

[0060] In this way, it is possible to avoid the connection rod 12 of the wheelchair cooperating with the base assembly 1 from having too high a speed or kinetic energy when reaching the end of the strip constraint groove 32 , thereby avoiding a violent collision with the end of the strip constraint groove 32 .

[0061] It should be noted that the speed or kinetic energy of the connecting rod 12 of the wheelchair-matching base assembly 1 when it reaches the end of the strip-shaped constraint groove 32 needs to ensure that it can retreat synchronously with the limiter upper cover 3.

[0062] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A locking mechanism for locking an autonomous driving wheelchair, used to lock a wheelchair-matching base assembly (1) of the autonomous driving wheelchair, characterized in that: The wheelchair matching base assembly (1) comprises a base plate (11), a wheelchair mounting portion (13) and a connecting rod (12) connected between the base plate (11) and the wheelchair mounting portion (13); the locking mechanism comprises a stopper base (2), a stopper upper cover (3) and a power mechanism (4); The stopper upper cover (3) is slidably mounted on the stopper base (2) in an inclined manner, and together with the stopper base (2) forms a clamping space for clamping the bottom plate (11); When the upper cover (3) of the stopper tilts and slides along the extension direction, the height of the clamping space gradually increases to allow the bottom plate (11) to enter the clamping space; when the upper cover (3) of the stopper tilts and slides along the retraction direction, the height of the clamping space gradually decreases to clamp the bottom plate (11); The upper cover (3) of the limiter is provided with a V-shaped guide portion (31) and a strip-shaped constraint groove (32), and the V-shaped guide portion (31) is used to guide the connecting rod (12) to enter the strip-shaped constraint groove (32); The power mechanism (4) is arranged between the stopper base (2) and the stopper upper cover (3) and is used to drive the stopper upper cover (3) to slide.

2. The locking mechanism for locking the automatic driving wheelchair according to claim 1, characterized in that: It also includes an ejection locking mechanism (5) and an induction triggering mechanism (6); wherein, The bottom plate (11) is provided with a locking hole (111), and the induction trigger mechanism (6) is connected to the ejection locking mechanism (5) and is used to trigger the ejection locking mechanism (5) to eject and embed into the locking hole (111) when the bottom plate (11) is sensed to move into position in the clamping space.

3. The locking mechanism for locking the automatic driving wheelchair according to claim 2, characterized in that: The ejection locking mechanism (5) is an electromagnet lock.

4. The locking mechanism for locking the automatic driving wheelchair according to claim 2, characterized in that: The induction trigger mechanism (6) is a proximity sensor.

5. The locking mechanism for locking the automatic driving wheelchair according to claim 1, characterized in that: The two sides of the stopper base (2) are respectively provided with oblique grooves (21), and the two sides of the stopper upper cover (3) are respectively installed with matching rods (7), and the matching rods (7) are slidably installed in the oblique grooves (21).

6. The locking mechanism for locking the automatic driving wheelchair according to claim 1, characterized in that: It also includes a pressure sensor and a controller, wherein the pressure sensor is arranged at the end of the strip-shaped constraint groove (32) and is used to detect the collision force between the connecting rod (12) and the end of the strip-shaped constraint groove (32); The controller is respectively connected to the pressure sensor and the power mechanism (4) and is used to control the power mechanism (4) to drive the limiter upper cover (3) to slide obliquely along the retreat direction when receiving a collision force.

7. The locking mechanism for locking the automatic driving wheelchair according to claim 1, characterized in that: Also included is a speed sensor and a controller, wherein the speed sensor is used to detect the speed of the automatic driving wheelchair in a preset interval; The controller is connected to the speed sensor and the automatic driving wheelchair respectively, and is used to control the automatic driving wheelchair to decelerate when the speed of the automatic driving wheelchair is greater than a preset speed value.

8. The locking mechanism for locking the automatic driving wheelchair according to claim 1, characterized in that: The power mechanism (4) is a gas spring or a push rod mechanism.

9. The locking mechanism for locking the automatic driving wheelchair according to claim 1, characterized in that: The end of the bottom plate (11) facing the retraction direction of the stopper upper cover (3) is V-shaped, and the sharp corner of the V-shape faces the retraction direction of the stopper upper cover (3).

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