Wheelchair slope safe going-up / down aid

Abstract

To provide a wheelchair slope safe going-up / down aid for enabling a wheelchair to go up and down on a wheelchair slope little by little.SOLUTION: When a roller towed by a wheelchair goes up by rolling on a saw tooth-shaped board attached to a wheelchair slope, the roller moves by repeating going-up on a slope of a saw tooth and going-down onto a valley of the saw tooth. When a caring person loosens force to push the wheelchair, the roller stops by fitting at the valley of the nearest saw tooth below. When the wheelchair goes down the slope, the caring person grips a roller pull-up lever attached to a handle part of the wheelchair so as to pull up the roller to be higher than the saw tooth of the saw tooth-shaped board. Thus, the wheelchair can go down the wheelchair slope. When stopping the going-down wheelchair, the roller pull-up lever is opened to put down the roller onto the saw tooth-shaped board, so that the roller stops by fitting at the valley of the nearest valley of the saw tooth below.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wheelchair ramp safety aid that enables a wheelchair to ascend and descend the wheelchair ramp in small steps. [Background technology]

[0002] When a wheelchair carrying a disabled person goes up or down a wheelchair ramp, the caregiver must lean from behind and push the wheelchair up step by step, or support the wheelchair as it retreats by putting their feet on the ground and descending step by step. In this case, the caregiver must be physically strong and have stamina, and a weak caregiver may be at risk of accidents.

[0003] If the wheelchair has an assistant brake on the hand grip, the wheelchair can slowly ascend and descend the wheelchair ramp by repeatedly stopping and moving by applying and releasing the brake. However, when stopping the wheelchair on the wheelchair ramp, it is necessary to continue to strongly pull the brake with the strength of the arms, and safe ascent and descent cannot be guaranteed for elderly or frail assistants who do not have the strength of the arms. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-29969 Summary of the Invention [Problem to be solved by the invention]

[0005] To provide a wheelchair slope safe ascending and descending aid that enables even an assistant who is physically weak due to old age or the like to safely ascend and descend a wheelchair slope by moving the wheelchair carrying a disabled person up and down the slope in small increments. [Means for solving the problem]

[0006] The concept of the wheelchair ramp safety climbing aid of the present invention is shown in Fig. 1a (side view) and Fig. 1b (rear view). The wheelchair ramp safety climbing aid consists of two parts: a sawtooth plate (10) attached to the wheelchair ramp (30), shown in grey in Fig. 1, and a roller device (20) attached to the wheelchair (40), shown in black in Fig. 1.

[0007] A sawtooth plate (10) is laid and fixed in the center of the wheelchair ramp (30). The sawtooth plate (10) is narrower than the width of the wheelchair (40), has a length approximately equal to the length of the wheelchair ramp (30), and has a sawtooth wave surface. The sawtooth plate (10) is fixed to the wheelchair ramp (30) so that the ascending direction of the sawtooth wave surface coincides with the ascending direction of the wheelchair ramp (30).

[0008] In addition, the sawtooth plate can be integrated with the wheelchair ramp during the manufacturing process to create a wheelchair ramp with a sawtooth plate.

[0009] A roller device (20) is attached to the wheelchair (40). The roller device (20) is a device in which rollers (21) having a diameter equivalent to the step height of the sawtooth plate (10) are attached to the wheelchair via a roller pulling arm (22) with a flexible joint, and are pulled by the wheelchair (40). This roller device (20) has a function of being able to pull up the rollers (21) to a height higher than the height of the sawtooth plate (10) by pulling a roller pulling lever (252) attached to the handle of the wheelchair.

[0010] The operation concept of the ramp safety climbing aid when a wheelchair ascends is shown in Fig. 1 and Fig. 2a. As shown in Fig. 1, when a wheelchair (40) pulling a roller device (20) is pushed by a caregiver to ascend a wheelchair ramp (30) with a sawtooth plate (10) fixed to the wheelchair ramp (30) sandwiched between the wheels of the wheelchair (40), the roller (21) advances by repeatedly climbing the slope of the sawtooth (12) and dropping into the valley of the sawtooth (12), as shown in Fig. 2a. Fig. 2a shows three shots of the ascending roller. When the caregiver relaxes the force pushing the wheelchair (40), the wheelchair (40) starts to descend the wheelchair ramp (30) together with the roller (21), but the roller (21) gets stuck in the valley of the sawtooth (12) closest to the bottom. At this time, the rollers (21) support the force of the wheelchair (40) trying to descend by the wall of the sawtooth (12) via the roller traction arms (22), so that the wheelchair (40) cannot descend and remains in place.

[0011] The operation concept of the ramp safety climbing aid when the wheelchair descends is shown in Figure 2b. When the wheelchair (40) is about to descend the wheelchair ramp (30), the attendant grasps the roller lifting lever (252) attached to the handle of the wheelchair and pulls up the wire (241). This causes the roller (21) to be raised to a height higher than the sawtooth (12) of the sawtooth plate (10). This enables the wheelchair (40) to descend the wheelchair ramp (30). When it is desired to stop the descending wheelchair (40), the attendant releases the roller lifting lever (252) that has been grasped and the roller (21) is lowered onto the sawtooth plate, where the roller (21) gets caught in the valley of the nearest sawtooth (12) and stops. Figure 2b shows four shots of the descending roller (21). The rollers (21) that are caught in the valleys of the sawtooth (12) support the wheelchair (40) through the roller traction arms (22), so that the wheelchair (40) cannot descend and remains in place. Effect of the Invention

[0012] To provide a wheelchair slope safe ascending and descending aid that enables even a physically weak caregiver to safely ascend and descend a wheelchair slope carrying a disabled person by moving the wheelchair forward and backward in small increments on the wheelchair slope. [Brief description of the drawings]

[0013] [Figure 1] 1A and 1B are diagrams showing the concept of a wheelchair ramp safety aid according to the present invention, in which a is a side view and b is a rear view. [Diagram 2] A diagram showing the operation concept of the ramp safety climbing aid when ascending and descending a wheelchair. a is the operation concept diagram when ascending. b is the operation concept diagram when descending. [Diagram 3] FIG. 1 is an overall view of one embodiment of a wheelchair ramp safety ascending and descending aid. [Figure 4] Side view (a) and top view (b) of the serrated plate. [Diagram 5] FIG. [Figure 6] An overhead view of the roller device attached to a wheelchair. [Figure 7] A diagram of how the boom is attached to the wheelchair. [Figure 8] Eye bolt and plastic pipe clamp attached to the boom. [Figure 9] Aerial view of the wire section. [Figure 10] An overhead view showing the roller in the raised position. [Figure 11] An overhead view of the orthogonal clamp and press screw stopper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An embodiment of the present invention will be described below. Figure 3 is an overall view of this embodiment. EXAMPLES

[0015] The wheelchair ramp safety climbing aid consists of two parts: a sawtooth plate attached to the wheelchair ramp as shown in Figure 4, and a roller device attached to the wheelchair as shown in Figure 5.

[0016] A side view of the sawtooth plate (10) is shown in Figure 4a, and a plan view is shown in Figure 4b. The sawtooth plate (10) is composed of a base plate (11) and sawtooth (12). The base plate (11) is narrower than the width between the rear wheels of a wheelchair, and is about the same length as the wheelchair ramp. The sawtooth (12) has a tooth height of about 2 centimeters or less, and the slope length of the sawtooth is several centimeters to about 10 centimeters. The sawtooth (12) is arranged perpendicular to the long axis of the base plate (11) at intervals of several centimeters to 20 centimeters.

[0017] The sawtooth plate (10) is fixed to the wheelchair ramp (30) so that the ascending direction of the slope of the sawtooth (12) coincides with the ascending direction of the wheelchair ramp. In this embodiment, the sawtooth plate (10) is fixed to the wheelchair ramp (30) by attaching a base plate fixing hook (13) to the top end of the sawtooth plate (10) and hooking it onto the upper end of the wheelchair ramp (30) as shown in Figure 4.

[0018] A roller device (20) shown in Figure 5 is attached to the wheelchair (40). The roller device (20) is composed of a roller (21), a roller towing arm (22), a main boom (23), a wire portion (24), and an auxiliary handle portion (25).

[0019] As shown in Figure 6, the roller device (20) is attached to the wheelchair (40) by fixing the main boom (23) at the intersection of the horizontal base frame (42) and the vertical back frame (43) of the wheelchair (40) and attaching the auxiliary handle (25) to the hand grip (41) of the wheelchair. Figure 7 shows an enlarged view of the main boom (23) attachment portion.

[0020] The roller (21) has a diameter approximately equal to the height of the teeth of the sawtooth plate (10) (12). As shown in Figure 7, the left and right ends of the shaft of this roller (21) are supported by bearings (221) of the roller pulling arm (22). The roller pulling arm (22) is connected to the main boom (23) by a flexible joint (222) and is movable up and down.

[0021] In order to secure the main boom (23) to the wheelchair (40), in this embodiment, as shown in Fig. 8a, eyebolts (231) and plastic pipe clamps (232) are attached to both ends of the main boom (23). By passing the eyebolts (231) through the horizontal base frame (42) of the wheelchair (40) and fitting the plastic pipe clamps (232) into the vertical back frame (43), the main boom (23) can be secured to the wheelchair (40) as shown in Fig. 8b.

[0022] Figure 9 shows the wire portion (24) that connects the roller (21) and the auxiliary handle portion (25). The wire hook (242) at the lower end of the wire portion (24) is attached to the roller towing arm (22) as shown in Figure 7. The upper part of the wire hook (242) is connected to the lower end of the turnbuckle (243). The upper end of the turnbuckle (243) is connected to the wire (241).

[0023] A roller pulling-up hook (244) is attached to the loop of the wire (241) on the side that is connected to the turnbuckle (243).

[0024] The upper end of the wire (241) is connected to a roller lifting lever (252) through a hole drilled in the center of the auxiliary handle (251) as shown in FIG.

[0025] The length of the wire portion (24) is adjusted so that the roller (21) comes into contact with the base plate (11) of the sawtooth plate (10) when the roller lifting lever (252) is not pulled, and the roller (21) is raised higher than the height of the sawtooth (12) of the sawtooth plate (10) when the roller lifting lever (252) is pulled.

[0026] The roller lifting hook (244) is used when the wheelchair (40) pulls up the rollers (21) on flat ground to move forward after passing over the wheelchair ramp (30). Figure 10 shows the rollers (21) pulled up and hooked onto the roller lifting hook (244).

[0027] The auxiliary handle (251) is connected to the hand grip (41) of the wheelchair (40) via an orthogonal clamp (253) shown in Figure 11. A set screw stopper (254) is attached to fix the orthogonal clamp (253) to the hand grip (41). [Explanation of symbols]

[0028] 10 Sawtooth Plate 11 Substrate 12 Sawtooth 13 Board fixing hook 20 Roller device 21 Roller 22 Roller towing arm 221 Bearings 222 Flexible joint 23 Main Boom 231 Eyebolt 232 Plastic pipe clamp 24 Wire section 241 Wire 242 Wire Hook 243 Turnbuckle 244 Roller lifting hook 25 Auxiliary handle 251 Auxiliary Handle 252 Roller lift lever 253 Orthogonal Clamp 254 Push screw stopper 30 Wheelchair ramp 40 Wheelchair 41 Hand Grip 42 Horizontal base frame 43 Vertical Back Frame

Claims

1. This wheelchair ramp safety climbing aid allows a user to ascend and descend the wheelchair ramp in small increments, and is characterized by being made up of two parts: a roller device attached to the wheelchair to pull the rollers, and a sawtooth plate attached to the wheelchair ramp.

2. 2. The wheelchair ramp safety ascent / descent aid according to claim 1, wherein the roller device allows the rollers pulled by the wheelchair to roll on the sawtooth plate.

3. 2. The wheelchair ramp safety ascent / descent aid according to claim 1, wherein the roller device can move on the sawtooth plate without rolling by pulling up the roller with a roller pulling-up lever.

4. The wheelchair ramp safety ascent and descent aid according to claim 1, characterized in that the sawtooth plate has a sawtooth wave surface, and when the wheelchair is pulled by the roller device to ascend, it does not impede the progress of the rollers, and when the wheelchair is pulled by the roller device to descend, it receives the rollers in the valleys of the sawtooth.

Images