JP2022062844A - Vehicle for ascending and descending stairs - Google Patents

Abstract

To provide a vehicle for ascending and descending stairs which can ascend or descend stairs safely and easily.SOLUTION: A vehicle for ascending and descending stairs includes: a vehicle body 10 including front wheels and rear wheels which movably support a placement base part on which a human and luggage are placed; and an operation handle 30 provided at a rear part of the vehicle body 10; casters 20a, 20b which are provided at the vehicle body 10 so as to engage with a stair-nosing 92 one step higher in a state that the rear wheels 18a, 18b are placed on the tread 91 when the vehicle ascends or descends stairs; and an engagement releasing mechanism 40 which releases engagement between the casters 20a, 20b and the stair-nosing 92 by the operation lever 41 being operated to cause a pressing part 52 of a pressing member to press a riser 93.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle for ascending and descending stairs.

As a vehicle capable of manually raising and lowering stairs, for example, a trolley for raising and lowering stairs disclosed in Patent Document 1 is known. This trolley for ascending and descending stairs has main wheels and auxiliary wheels attached to the trolley frame, and when climbing the stairs, push down the lever-type handle legs with the auxiliary wheels located on the tread one step above the main wheels. As a result, the main wheel can be raised and moved to the tread on the same step as the sub wheel.

Japanese Patent Application Laid-Open No. 2003-72557

However, since the safety of the above-mentioned conventional trolley for raising and lowering stairs has not been sufficiently examined when going down the stairs, there is room for improvement in this respect.

Therefore, an object of the present invention is to provide a vehicle for ascending and descending stairs that can easily and safely ascend and descend stairs.

The object of the present invention is to move up and down stairs including a vehicle body having front wheels and rear wheels that movably support a mounting table on which people and luggage are placed, and an operation handle provided at the rear of the vehicle body. The caster provided on the vehicle body so as to engage with the nose one step higher with the rear wheel mounted on the tread when going up and down the stairs, and the pressing portion of the pressing member by operating the operation lever. This is achieved by a stair climbing vehicle equipped with an disengagement mechanism that presses the riser to disengage the caster from the nose.

In this stair climbing vehicle, it is preferable that the pressing portion of the pressing member is urged toward the front of the vehicle body by the urging member, and the pressing portion is urged by the operation of the operation lever. It is preferable to move backward against the urging force of the member.

Further, it is preferable to provide an outer member and an inner member which are arranged on the side of the vehicle body at intervals and can accommodate the handrail of the stairs, and the handrail is sandwiched above the outer member and the inner member. A pinching portion is formed so that the spacing gradually narrows upward, and it is preferable to further include a pinching release lever that presses the handrail pinched by the pinching portion from above to release the pinching.

According to the present invention, it is possible to provide a vehicle for ascending and descending stairs that can easily and safely ascend and descend stairs.

It is a side view of the vehicle for raising and lowering stairs which concerns on one Embodiment of this invention. It is a rear view of the vehicle for raising and lowering stairs shown in FIG. It is a figure which shows typically the operation of the main part of the stair climbing vehicle shown in FIG. 1. It is a side view for demonstrating the operation of the stair climbing vehicle shown in FIG. 1 at the time of ascending. It is a side view for demonstrating the operation of the stair climbing vehicle shown in FIG. 1 at the time of descending. It is a side view for demonstrating the function of the vehicle for ascending and descending stairs shown in FIG. It is a front view of the main part for demonstrating the function of the vehicle for ascending and descending stairs shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of a vehicle for raising and lowering stairs according to an embodiment of the present invention, and FIG. 2 is a rear view of the vehicle for raising and lowering stairs shown in FIG. As shown in FIGS. 1 and 2, the stair climbing vehicle 1 has a vehicle body 10 provided with a mounting table portion 11 on which a person or luggage is placed, and an operation handle 30 provided at the rear portion of the vehicle body 10. The vehicle body 10 can be moved in the front-rear direction (left-right direction in FIG. 1) by operating the operation handle 30.

The vehicle body 10 includes a pair of front leg frames 14a and 14b, a pair of overhanging frames 15a and 15b, and a pair of rear leg frames 16a and 16b provided on the left and right sides. The pair of overhanging frames 15a and 15b are fixed so as to project forward with respect to the pair of front leg frames 14a and 14b, and are mounted by the pair of front leg frames 14a and 14b and the pair of overhanging frames 15a and 15b. Part 11 is supported. The mounting base portion 11 is surrounded on the side and the rear by the wall portion 12, and the mounting portion 13 is provided on the rear surface of the wall portion 12.

The pair of rear leg frames 16a and 16b are fixed to the pair of front leg frames 14a and 14b. Front wheels 17a, 17b and rear wheels 18a, 18b are attached to the lower ends of the pair of front leg frames 14a, 14b and the pair of rear leg frames 16a, 16b, respectively. The front wheels 17a, 17b and the rear wheels 18a, 18b support the mounting table portion 11 so as to be movable back and forth while the upper surface of the mounting table portion 11 is parallel to the floor surface F.

A support plate 19 is fixed between the pair of rear leg frames 16a and 16b via a bracket. The support plate 19 is provided so as to be slightly inclined rearward with respect to the vertical plane, and a pair of casters 20a and 20b are attached to the upper portion of the rear surface of the support plate 19. The casters 20a and 20b have a known configuration in which the wheels 21a and 21b are rotatably supported by the supports 22a and 22b.

The operation handle 30 is an ascending grip portion 32 that connects the pair of columns 31a and 31b fixed to the pair of front leg frames 14a and 14b so as to extend vertically upward and the upper portions of the pair of columns 31a and 31b on the front side. And a pair of plumb bobs 33a, 33b protruding rearward from the upper part of the pair of columns 31a, 31b, respectively.

The disengagement mechanism 40 is attached to the attachment portion 13 of the vehicle body 10. The disengagement mechanism 40 includes an operation lever 41 and a pressing member 49. The operating lever 41 is formed in a rod shape, and the base end portion is rotatably supported by the mounting portion 13 via the rotating shaft 42, and the stepping portion 43 that branches diagonally upward to the central portion of the operating lever 41. Is provided. The stepping portion 43 is attached to the mounting portion 13 via an urging member 44 made of a coil spring or the like. An engaging member 45 is rotatably attached to the tip of the operating lever 41 via a rotating shaft 46, and an engaging member 45 is formed in a semicircular shape in a side view on the tip of the engaging member 45. A portion 47 is provided. The engagement member 45 is restricted from rotating with respect to the operating lever 41 by abutting the base end side of the rotation restricting piece 48 provided on the tip end side of the operating lever 41.

The pressing member 49 is formed in a bent shape and is rotatably supported by a support plate 19 via a rotation shaft 51. A side view circular locking portion 50 that engages with the engaging member 45 is provided on one end side of the pressing member 49, and a side view circular pressing portion 52 is provided on the other end side of the pressing member 49. It is provided. The pressing member 49 is attached to a mounting plate 54 fixed to the support plate 19 via an urging member 53. The urging member 53 urges the pressing portion 52 toward the front of the vehicle body 10.

Further, the stair climbing vehicle 1 is provided with handrail holding portions 60a and 60b for holding the handrails of the stairs on the left and right sides of the vehicle body 10. The handrail holding portions 60a and 60b include outer members 61a and 61b and inner members 66a and 66b arranged apart from each other so as to accommodate the handrails of the stairs. Holding portions 67a, 67b and 68a, 68b are formed on the upper portions of the outer members 61a, 61b and the inner members 66a, 66b so that the distance between them gradually narrows upward, respectively, and the holding portions 67a, The handrail can be sandwiched between 68a or between the sandwiching portions 67b and 68b. Above this gap, the pinch release levers 70a and 70b are arranged. The pinch release levers 70a and 70b are rotatably supported by the outer members 61a and 61b and the inner members 66a and 66b via the rotation shafts 71a and 71b, and the base end portion extending in the vicinity of the operation handle 30. By pushing down the 72a and 72b, the protrusions 73a and 73b of the pinching release levers 70a and 70b can press the handrail to release the pinching of the handrail.

As shown in FIG. 1, the outer member 61a is rotatably supported with respect to the overhanging frame 15a via a rotation shaft 62a, and is equidistantly spaced so as to project in the radial direction of the rotation shaft 62a. It is provided with three engaging protrusions 63a, 64a, 65a provided. The outer member 61b is also configured in the same manner as the above-mentioned outer member 61a.

FIG. 3 is a diagram schematically showing the operation of the disengagement mechanism 40. As shown in FIG. 3A, when the stepping portion 43 is stepped on in the direction of arrow A with the foot while the engaging member 45 is engaged with the pressing member 49, the operating lever is as shown in FIG. 3B. 41 rotates in the direction B indicated by the arrow, and the engaging member 45 comes into contact with the rotation restricting piece 48 and rotates integrally with the operation lever 41. When the stepping portion 43 is continuously depressed, the engaging member 45 moves in the arrow C direction, so that the pressing member 49 rotates in the arrow D direction against the urging force of the urging member 53, and the pressing portion 52 moves backward.

When the stepping portion 43 is further stepped on, the engaging portion 47 moves over the locking portion 50 and is released from the engagement with the pressing member 49, as shown in FIG. 3 (c). The pressing member 49 rotates in the arrow E direction by the urging force of the urging member 53, and the pressing portion 52 moves forward to the original position. Further, the operating lever 41 rotates in the arrow F direction due to the urging force of the urging member 44. As a result, as shown in FIG. 3 (d), the engaging member 45 rotates in the direction of arrow G while sliding the locking portion 50, gets over the locking portion 50, and again in FIG. 3 (a). It becomes the state shown in.

In the stair climbing vehicle 1 having the above configuration, when ascending the stairs, as shown in FIG. 4A, the operation handles are first placed on the treads 91 of the stairs 90 with the rear wheels 18a and 18b. By gripping the ascending grip portion 32 of 30 and pulling it toward the front, the casters 20a and 20b are engaged with the nose 92 of the tread 91 one step higher. Then, as shown in FIG. 4 (b), the rear wheels 18a and 18b are rotated in the arrow H direction by rotating the ascending grip portion 32 with the engaging portion between the casters 20a and 20b and the nose 92 as a fulcrum. Floats in the direction of arrow I. After that, the rear wheels 18a and 18b are moved by pulling the ascending grip portion 32 toward the front and moving the casters 20a and 20b in the direction of arrow J to return the posture of the stair climbing vehicle 1 to the original posture. As the casters 20a and 20b move to the tread 91 one step higher, the casters 20a and 20b engage with the nose 92 one step higher to reach the state shown in FIG. 4 (a). By repeating this operation, the stair climbing vehicle 1 can be safely and surely raised step by step.

On the other hand, when lowering the stairs, as shown in FIG. 5A, the rear wheels 18a and 18b are placed on the tread 91 of the stairs 90, and the casters 20a and 20b are engaged with the nose 92 of the tread 91 one step higher. In this state, as shown in FIG. 5B, by stepping on the stepping portion 43 in the arrow K direction, the pressing portion 52 presses the kick 93 in the arrow L direction, and the casters 20a and 20b and the stair nose The engagement with 92 is released. As a result, the rear wheels 18a and 18b can be smoothly moved to the tread 91 one step lower, and the casters 20a and 20b engage with the step nose 92 to be in the state shown in FIG. 5A. By repeating this operation, the stair climbing vehicle 1 can be safely and surely lowered step by step.

When the handrail is provided on the stairs 90, the handrail can be held by either the left and right handrail holding portions 60a and 60b. FIG. 6 shows a state in which the handrail 94 is held by the handrail holding portion 60a when the stair climbing vehicle 1 descends the stairs 90. When the stair climbing vehicle 1 descends the stairs 90 in a normal posture, as shown in FIG. 7A, a slight gap is generated between the handrail 94 and the outer member 61a and the inner member 66a. The vehicle 1 for ascending and descending stairs can be smoothly lowered. On the other hand, as shown in FIG. 6, when the stair climbing vehicle 1 is greatly tilted forward, the handrail 94 is sandwiched between the holding portions 67a and 68a as shown in FIG. 7B, and the stair climbing vehicle 1 is sandwiched between the holding portions 67a and 68a. Is locked, so that the stairs 90 of the stair climbing vehicle 1 can be reliably prevented from falling.

In the present embodiment, since the handrail 94 is sandwiched by the plurality of engaging protrusions 64a and 65a and the inner member 66a, the stair climbing vehicle 1 can be locked at a plurality of places along the handrail 94. It is possible to reliably stop the vehicle 1 for ascending and descending stairs while maintaining the posture. In the present embodiment, the sandwiching portions 67a and 68a are formed by using the inner surface of the outer member 61a as a vertical surface and the inner surface of the inner member 66a as an inclined surface, but the inner surface of the outer member 61a is used as an inclined surface inside. The inner surface of the member 66a may be a vertical surface, or both may be an inclined surface.

When releasing the pinching of the handrail 94 by the pinching portions 67a and 68a from the state shown in FIG. 7B, as shown in FIG. 6, the pinching release lever 70a is rotated in the direction M in the arrow direction to cause a collision. The handrail 94 is pressed by the portion 73 from above in the direction N of the arrow. As a result, the holding portions 67a and 68a can be relatively raised with respect to the handrail 94 to return to the state shown in FIG. 7A.

As shown in FIG. 7A, when the handrail 94 is attached to the wall surface 96 via a plurality of attachment portions 95 provided at intervals along the handrail 94, the outer member 61a is attached to the attachment portion. There is a risk of interfering with 95. In the present embodiment, since the outer member 61a is rotatably supported and has three engaging protrusions 63a, 64a, 65a, when the outer member 61a comes into contact with the mounting portion 95 when going up and down the stairs. It is possible to continue holding the handrail 94 by any of the three engaging protrusions 63a, 64a, 65a while the outer member 61a rotates to avoid interference with the mounting portion 95. After passing through 95, the outer member 61a can be returned to its original posture by its own weight.

1 Stair climbing vehicle 10 Vehicle body 11 Mounting base 17a, 17b Front wheels 18a, 18b Rear wheels 20a, 20b Caster 30 Operation handle 40 Disengagement mechanism 41 Operation lever 49 Pressing member 52 Pressing part 53 Biasing member 60a, 60b Handrail Holding parts 61a, 61b Outer members 66a, 66b Inner members 67a, 68b Holding parts 70a, 70b Holding release lever 90 Stairs 91 Tread 92 Step nose 93 Kicking

Claims (3)

A vehicle for climbing stairs having a vehicle body having front wheels and rear wheels that movably support a mounting table on which people and luggage are placed, and an operation handle provided at the rear of the vehicle body.
The casters provided on the vehicle body so as to engage with the nose one step higher with the rear wheels mounted on the tread when going up and down the stairs.
A vehicle for ascending and descending stairs provided with an engagement disengagement mechanism in which a pressing portion of a pressing member presses a riser by operating an operation lever to disengage the caster from the nose. In the pressing member, the pressing portion is urged toward the front of the vehicle body by the urging member, and the pressing portion is rearwardly opposed to the urging force of the urging member by operating the operating lever. The vehicle for ascending and descending stairs according to claim 1. It is provided with an outer member and an inner member which are arranged on the side of the vehicle body at a distance from each other and can accommodate the handrail of the stairs.
On the upper part of the outer member and the inner member, a holding portion is formed in which the distance is gradually narrowed upward so that the handrail can be held.
The vehicle for raising and lowering stairs according to claim 1 or 2, further comprising a pinch release lever that presses the handrail pinched by the pinch portion from above to release the pinch.

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