JPH06321014A - Elevating-type plural staged step device of vehicle - Google Patents

Abstract

PURPOSE:To prevent steps from interfering with the ground surface by forcing links to make their downward turning movement by means of an elevating cylinder when a person gets on/off the steps, forming lower and intermediate steps into a step shape by lowering them and pulling the lower and intermediate steps up to the floor surface during run. CONSTITUTION:A pair of upper and lower links 8, 9 are journalled to a fixed frame 4 side so as to be vertically rotatable, and an intermediate step 12 in the horizontal state is journalled between the links 8, 9 through an intermediate stage bracket 10. Moreover a lower step 15 in the horizontal state is journalled to the tips of the links 8, 9 through a lower stage bracket 13. When the links 8, 9 are forced to make their downward turning movement by operating the elevating cylinder 19 provided between the fixed frame 4 side and the link 9 side, the intermediate stage and lower stage steps 12, 15 are lowered, thereby respective steps 15, 12, 5 on the lower stage, the intermediate stage and the upperstage are formed into a step shape. When the links 8, 9 are forced to make their upward turning movement by operating the elevating cylinder 19 in traveling, the lower stage and intermediate stage steps 15, 12 are raised to the position of the upper stage step 5 so as to be prevented from interfering with the ground surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-step device provided at an entrance / exit of a bus or the like.

[0002]

2. Description of the Related Art Conventionally, since the floor surface of a vehicle is higher than the ground, a plurality of steps are provided at the entrance and exit of a vehicle such as a bus. It is fixed to the side, and the lower step is a certain height above the ground (about 40 degrees) to prevent interference with the running ground.
0 mm).

[0003]

However, if the lower step has the height as described above, it is difficult for the elderly and children to get on and off, which requires a great deal of labor, and in the worst case, there is a risk of falling during getting on and off. . Therefore, the present invention provides a step structure in which the height of each step is increased during traveling to prevent interference with the ground and the like, and each step is lowered when getting on and off to allow an elderly person or a child to get on and off easily.

[0004]

SUMMARY OF THE INVENTION The present invention is a multi-step device for a vehicle having at least a lower step and an intermediate step at an entrance / exit of the vehicle, wherein a support column is fixed to a fixed frame located below the floor surface of the vehicle. Then, a pair of upper and lower links, each of which has a base portion pivotally supported, are provided on the left and right sides of the support column, and a middle step is supported in the middle of the link and a lower step is horizontally supported at the front portion in a horizontal state, and the support column is also supported. It is provided so as to form a parallelogram at each shaft fulcrum of the middle step side and the lower step side, and the link is vertically rotated on the fixed frame side so that the middle step and the lower step are on the floor surface or the floor surface. It is characterized in that an elevating drive device for elevating and lowering to the same position as the upper step of the integrated upper step or a stepwise position is provided.

[0005]

Operation: When getting on and off, the lifting cylinder is operated to rotate the link downward. When the link rotates downward, the lower step and the middle step descend, and in particular, the distance from the center of rotation of the link to the lower step axis fulcrum is longer than the distance to the middle step axis fulcrum, so the lower step lowers the middle step. And the lower step, the middle step, and the upper step or the floor becomes stepwise. Get on and off in this state.

When traveling, the lifting cylinder is operated to rotate the link upward. When the link is rotated upward, the lower step and the middle step, which were stepwise, are raised,
At the highest position, the lower step and the middle step are at the same position as the upper step or the floor surface, and the ground clearance of each step becomes high. As a result, there is no interference with the ground and it is possible to drive safely.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.
Reference numeral 1 denotes a step device provided at an entrance / exit 2 of a vehicle such as a bus. The step device 1 is fixed to a fixed frame 4 having a U-shaped cross section below a floor surface 3 of the vehicle and is lowered integrally with the floor surface 2 by one step. It is located below the upper step 5.

A door 6 opens and closes the entrance / exit 2. Explaining the step device 1 in detail, a pair of left and right flat support columns 7 are fixed to the fixed frame 4, and upper and lower links 8 and 9 are vertically arranged on the side faces of the respective support columns 7. Axial support 8 that allows the base to rotate up and down
A, 9A.

A flat plate-shaped middle bracket 10 is pivotally supported 8B and 9B at a position between the upper and lower links 8 and 9, that is, at a position half the link length, and the pair of left and right middle brackets 10 are supported.
A pair of front and rear reinforcing frames 11 are erected on the upper part of, and a flat plate-shaped horizontal middle step 12 is fixed on the reinforcing frame 11. The intermediate step 12 forms a parallelogram with the axial fulcrums 8A and 9A of the support column 7 and the axial fulcrums 8B and 9B of the intermediate bracket 10 to maintain a horizontal state at all times even when the vertical links 8 and 9 rotate. You can do it.

A flat plate-shaped lower bracket 13 is pivotally supported 8C and 9C at the front ends of the upper and lower links 8 and 9, and a pair of front and rear reinforcing frames 14 are installed above the pair of left and right lower brackets 13. A flat lower horizontal step 15 is fixed on the reinforcing frame 14. The lower step 1
Reference numeral 5 denotes the pivot fulcrums 8A and 9A of the support column 7 and the lower bracket 1
A parallelogram is formed with the three axial fulcrums 8C and 9C so that the horizontal state can be maintained at all times even if the upper and lower links 8 and 9 rotate.

Further, the shaft fulcrums 8B, 9 on the side of the middle step 10
Since B is located at an intermediate position between the upper and lower links 8 and 9, the lower step 15 can move up and down about twice as much as the middle step 12. A connecting frame 16 is installed between the pair of left and right lower links 9 between an axial fulcrum 9B of the middle bracket 10 and an axial fulcrum 9C of the lower bracket 13, and is fixed to a bracket 17 fixed in the middle of the connecting frame 16. A hydraulic or electric lifting cylinder 19 as a lifting drive device is provided between the bracket 18 fixed to the frame 4 and the lifting / lowering cylinders 19 expand and contract to rotate the upper and lower links 8 and 9 up and down. At the highest position, the lower step 15 and the middle step 12 are at the same position as the upper step 5, as shown in FIG. 2, and at the highest position, the steps 5, 12, and 15 are stepwise as shown in FIG. Step 1
The height above ground of 5 and the height difference between each step 5, 12, and 15 can be reduced to about 150 mm.

Reference numeral 20 denotes a lock device for holding the middle step 12 and the lower step 15 in the same position as that of the upper step 5 (FIG. 2). The locking device 20 is a U-shape extended from the fixed frame 4. Mounting frame 21
The lock cylinder 23 is fixed to the lock cylinder 23 via the auxiliary frame 22, and the lock pin 25 is provided at the tip of the rod 24 of the lock cylinder 23.
It is slidably supported by a guide tube 26 fixed to the No. 1 unit. On the other hand, the auxiliary bracket 27 is provided on the middle bracket 10 side.
The engaging member 28 is provided at a position facing the lock pin 25 via the lock pin 25, and the lock pin 2 is inserted into the hole 29 of the engaging member 28.
When 5 is engaged, it is possible to regulate the lowering of each step 12, 15.

In the embodiment, the highest rising position of each step is made to coincide with the upper step, but it is also possible to make it coincide with the floor surface when there is no upper step. Further, the middle step is not limited to one step and may be a plurality of steps. In that case, each middle step may be pivotally supported on the link in a horizontal state.

The operation of the present invention having the above-described construction will be described next. First, when the vehicle arrives at the boarding / alighting place, the door 6 is opened from the state shown in FIG. 2 and the lock cylinder 23 of the lock device 20 is operated to operate the lock pin 25. The locking member 28
Release the engagement with. After the above state, the lifting cylinder 19 is extended to rotate the upper and lower links 8 and 9 downward. The lower step 15 and the middle step 12 are both lowered by the downward rotation of the upper and lower links 8 and 9, but at that time, the respective shaft fulcrums 8A, 9A, 9B, 8B, 8A, 9A, 9
Since the parallelogram is formed by C and 8C, both steps 15 and 12 always descend in a horizontal state, and the shaft fulcrums 8B and 9B of the middle step 12 and the shaft fulcrums 8C and 9C of the lower step 15 are attached. Due to the difference in position, the amount of descent in the lower step 15 is larger than that in the middle step 12.

When both steps 12 and 15 are fully lowered, FIG.
As described above, the passengers get on and off the vehicle through the steps 15, 12, and 5 in this state. At that time, as the lower step 15 moves closer to the ground, step 1
Since the height between 5, 12, and 5 is small, even an old man or a child can easily get on and off. When the boarding / alighting of passengers is completed, the lifting cylinder 19 is contracted from the state shown in FIG. Up / down links 8 and 9 by reducing the lifting cylinder 19
Rotates upward, and lower step 15 and middle step 12
Rises. When both steps 15 and 12 rise to the maximum, both steps 15 and 12 are flush with the upper step 5, as shown in FIG. 2, and the ground clearance of each step 15 and 12 can be increased.

After the above state, the lock cylinder 23 is operated to engage the lock pin 25 with the hole 29 of the locking member 28 on the side of the middle step 12, and the middle step 12 and the lower step 15 are held at the highest position. . At the same time, the door 6 of the entrance / exit 2 is closed and the vehicle travels to the next entry / exit location.

[0017]

As described above, according to the present invention, a pair of upper and lower links are pivotally supported on the fixed frame side of a vehicle so as to be vertically rotatable, and the middle step and the lower step are respectively supported in the horizontal state and each axis is also supported. By forming a parallelogram at the fulcrum and rotating the link up and down with the lifting cylinder, both steps become the upper step or the same plane as the floor at the highest position and stepwise at the lowest position. Therefore, it is possible to raise the ground height of the step while traveling and eliminate the interference with the ground, etc., and when getting on and off, the height from the ground to the lower step and the height between each step can be reduced. It is easy and safe for old people and children to get on and off.

[Brief description of drawings]

FIG. 1 is an overall view of a boarding / alighting state of the present invention.

FIG. 2 is an overall view of a traveling state of the present invention.

3 is an AA diagram of FIG. 1. FIG.

FIG. 4 is an enlarged cross-sectional view of a lock device.

[Explanation of symbols]

 1 step device 3 floor surface 4 fixed frame 7 support pillar 8 upper link 9 lower link 12 middle step 15 lower step 19 lifting cylinder

Claims (1)

[Claims] 1. A multi-step device for a vehicle having at least a lower step and an intermediate step at an entrance / exit of the vehicle, wherein a support column is fixed to a fixed frame located below a floor surface of the vehicle, and a base portion is provided on the support column. A pair of upper and lower links that pivotally support the
A middle step is provided in the middle of the link, and a lower step is horizontally supported at the front part, and a parallelogram is formed at the support column, the middle step side, and the lower step side shaft fulcrums. An elevating drive device is provided on the fixed frame side to vertically move the link to move the middle step and the lower step to the same position as the floor or the upper step integrated with the floor or to a stepped position. Elevating multi-step device for vehicles.