Wheelchair with anti-tip function

Abstract

We provide wheelchairs with anti-tip features to prevent users from falling to the left or right in care facilities and similar settings. [Solution] The present invention comprises a first seat surface on which the user sits, a protrusion provided approximately in the middle of the lower part of the first seat surface, a second seat surface having a hole through which the protrusion can pass, and a stopper placed on the upper surface of the second seat surface to prevent the first seat surface from sinking. When the lever of the stopper is turned forward, the stopper fitting portion engages with the stopper, and the first seat sinks down due to the wheel coupling portion which connects with the protrusion of the first seat provided below the second seat, causing the wheel coupling portion to move downward and the wheels to spread to the left and right.

Description

[[Technical Field]]

[0001] The present invention relates to a wheelchair with a fall prevention function that prevents falls when monitoring users in nursing care facilities and the like. [[Background Art]]

[0002] Conventionally, a stopper with casters mountable to a wheelchair has been attached to the rear of the wheelchair to prevent backward falls. In the case of casters equipped on wheelchairs and detachable fall prevention stoppers, there have been cases where when the wheelchair swings left or right, it falls over, resulting in injury. [[Prior Art Documents]] [[Patent Documents]] [[Patent Document]] JP 2019-93010 A [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0003] In the prior art document, a fall prevention bar is provided for backward tilting of a wheelchair. However, this wheelchair is not effective in preventing falls caused by left or right tilting. An object of the present invention is to provide a wheelchair with a fall prevention function that prevents injury caused by falling of the wheelchair against left-right swinging. [[Means for Solving the Problem]]

[0004] The present invention is a wheelchair with a fall prevention function that prevents users from falling left or right. The present invention comprises: a first seat surface on which a user sits; a convex portion provided substantially in the middle of a lower portion of the first seat surface; a second seat surface provided with a hole through which the convex portion can pass; and a stopper placed on an upper surface of the second seat surface that prevents sinking of the first seat surface. When the lever of the stopper is rotated forward, the stopper fitting portion fits into the stopper, and the first seat surface sinks due to a wheel coupling portion coupled to the convex portion of the first seat surface provided below the second seat surface, and the wheel coupling portion moves downward, thereby spreading the wheels to the left and right.

[0005] Furthermore, the wheel coupling portion is composed of a substantially polygonal shape with multiple elongated holes. The polygon has a movable part that moves through the elongated holes. [Effects of the Invention]

[0006] This can prevent wheelchair users in care facilities and other similar settings from falling to the side. [Brief explanation of the drawing]

[0007] [Figure 1] External view of a wheelchair with anti-tip function [Figure 2] Diagram showing the stopper off state. [Figure 3] Diagram showing the stopper in the "on" position. [Figure 4] Irregular User Guide [Modes for carrying out the invention]

[0008] The embodiments for carrying out the invention will be described with reference to the drawings.

[0009] Figure 1 shows the appearance of a wheelchair with an anti-tipping function. Figure 1 shows a first seat 1 on which the user sits, with a protrusion 11 provided on the lower part of the first seat 1. A second seat 2 has a hole 12 through which the protrusion 11 can pass, a stopper 3 to prevent the first seat 1 from sinking, and a wheel coupling part 5 is provided below the second seat 2. This wheel coupling part 5 is an inverted triangle, with two elongated holes facing the vertices of this triangle. A movable part 6 is provided that can move through these elongated holes, and this movable part 6 is connected to the wheel 7. Depending on the position of the movable part 6, the wheel 7 can spread out or narrow to the sides. Figure 1 shows the state in which the wheel 7 is not spread out to the sides.

[0010] Figure 2 shows the stopper 3 in the "stopper-on" state. This shows the state where the fitting portion 8 provided on the stopper 3 is not fitted into the fitting hole 9. Even when a user sits on the first seat surface 1, the protrusion 11 does not sink in through the hole 12, so the wheel coupling portion 5 and the moving portion 6 remain in their lower position. As a result, the wheels 7 do not spread apart.

[0011] Figure 3 shows the stopper 3 in the off position. The stopper 3 is provided with a lever 4 on the wheel coupling part 5, a fitting part 8 on the stopper 3, and a fitting hole 9 into which the fitting part 8 fits when the stopper is off. The fitting part 8 is linked to the lever 4 on the wheel coupling part 5. Figure 3 shows the state in which the fitting part 8 on the stopper 3 is fitted into the fitting hole 9. When a user sits on the first seat surface 1, the protrusion 11 sinks in through the hole 12, causing the wheel coupling part 5 to sink and the moving part 6 to stop in the upper position. This causes the wheels 7 to spread out. Furthermore, lever 4 rotates at a predetermined angle. In other words, turning the lever forward turns the stopper on, and turning the lever backward turns the stopper off.

[0012] Next, the use of the wheelchair with the fall prevention function of the present invention will be described. When the lever of stopper 3 is turned forward, the stopper is engaged, so the fitting part 8 does not sink into the fitting hole 9, the wheel coupling part 5 does not activate, the moving part 6 does not move upward, and the wheels 7 do not spread sideways. Normally, the user is moved in the wheelchair in this state. For example, the user can pass through elevators and doors while in the wheelchair.

[0013] As explained in Figure 3, when the user is not moving in the wheelchair, the lever of the stopper 3 is turned backward, and the fitting part 8 fits into the fitting hole 9. When the user sits on the first seat surface 1, the protrusion 11 sinks in through the hole 12, causing the wheel coupling part 5 to sink and the moving part 6 to stop in the upper position. This spreads the wheels 7 to the sides, activating the lateral anti-tipping function. In this case, even if an irregular usage method like the one shown in Figure 4 is used, the anti-tipping function will work, so the user will not fall over.

[0014] In this embodiment, the wheel coupling portion was described as triangular, but it is not limited to this, and the elongated hole can be made of other polygons such as a quadrilateral. [Explanation of Symbols]

[0015] 1. First seat 2nd seat 3 Stoppers 4 levers 5 wheel joint 6. Movable parts 7 wheels 8. Fitting part 9 fitting holes 11 protrusions 12 holes

Claims

1. A wheelchair with an anti-tip function that prevents the user from falling to the left or right, comprising: a first seat on which the user sits; a protrusion provided approximately in the middle of the lower part of the first seat; a second seat provided with a hole through which the protrusion can pass; and a stopper placed on the upper surface of the second seat to prevent the first seat from sinking, wherein when the lever of the stopper is turned forward, the stopper fitting part fits into the stopper, and the first seat sinks due to a wheel coupling part provided below the second seat that connects with the protrusion of the first seat, causing the wheel coupling part to move downward and the wheels to spread to the left and right.

2. The wheel coupling portion is composed of a polygon with a plurality of elongated holes, and has a movable portion that moves through the elongated holes, as described in claim 1, for a wheelchair with an anti-tipping function.

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