JPH0924835A - Traveling device in service wagon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a service car to be made to smoothly travel from the floor surface of the horizontal corridor to the floor surface of the upward inclined corridor, by horizontally providing a reciprocating deceleration rotary shaft on a lower surface center part of the service wagon chassis, supporting the center part of a forked leg in which rotary shaft traveling driving wheels are provided on both ends, and providing respective traveling driving wheels so that they may be raised and separated from the floor surface. SOLUTION: When a service wagon 11 is made to travel from the horizontal corridor floor surface 8 to the upward inclined floor surface 8' in a state where a reciprocating deceleration rotary shaft 2 is stopped by a brake motor, a forked leg 5 is downward turned by force of a coil spring in the movement from the floor surface 8 to the floor surface 8', and right and left traveling driving wheels 6 are brought in pressure contact with the boundary part between both floor surfaces 8, 8'. Accordingly, when the driving wheels 6 are turned by a driving motor 16 through a differential gear, the service wagon 11 can travel on the inclined floor surface 8'. When the direction of a chassis 1 is perpendicularly changed, the brake motor is reversely rotated, the forked leg 5 and the traveling driving wheels 6 are raised from the floor surface 8, and the chassis 1 is perpendicularly rotated by being supported only by casters 14 on four corners.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling drive device for a catering vehicle in a hospital or the like.

[0002]

2. Description of the Related Art Since the driving wheels of a conventional catering car in a hospital or the like are provided at fixed positions in the center of the chassis, the driving wheels float from the floor of the corridor when traveling from a horizontal corridor to an uphill corridor. Uphill, it becomes difficult to run.

Further, when changing the direction of an orthogonal corridor at a right angle, it is necessary to make a large roundabout of the traveling direction, and it is difficult to make a large turn in a narrow orthogonal corridor. There is.

[0004]

DISCLOSURE OF THE INVENTION The present invention not only allows the drive wheels to press the corridor floor to easily move to the upward sloped corridor even when moving from the horizontal corridor to the upward sloped corridor, but also allows a narrow orthogonal corridor to be conveniently constructed. An object of the present invention is to obtain a traveling drive device in a catering car which performs a right angle direction conversion.

[0005]

In order to achieve the above object, the present invention is provided with a storage cabinet on the chassis which can store the serving trays in the form of a shelf, and free wheels are provided at the four corners of the lower surface of the chassis. In a car, a forward / reverse deceleration rotation shaft orthogonal to the traveling direction of the chassis is horizontally provided in the center of the lower surface of the chassis, and an outer cylinder is provided in the center of the rotation shaft via a bearing, and the outer cylinder is attached to the outer cylinder. Two
The central part of the crotch leg is fixed in the rotating direction, the traveling drive wheels are provided at both ends of the two crotch legs, and the two crotch legs are provided downward between the both ends of the outer cylinder and the both ends of the rotating shaft. A coil spring for urging is provided to reverse the rotating shaft and to lift the two legs around the rotating shaft against the urging force of the coil spring so that the driving wheels can be lifted and separated from the floor surface. And a forward-reverse drive speed reducer for the rotating shaft and a forward-reverse drive brake motor for the rotary shaft.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, when the forward / reverse deceleration rotation shaft 2 is stopped by the brake motor 10 and the catering car 11 is moved or moved from the horizontal corridor floor surface 8 to the upward inclined floor surface 8, the horizontal corridor floor is obtained. On the surface 8, the bifurcated leg 5 pivots downward about the pivot shaft 2 by the force of the coil springs 7, 7 to press the traveling drive wheels 6, 6 at both ends to the floor 8 of the horizontal corridor.

In this state, the drive wheels 6, 6 are connected to the differential gear 1
It is possible to drive the undercarriage 1 of the catering car 11 by rotating the deceleration drive motor 16 via 5. At that time, the four corners of the chassis 1 are free wheels 14, 14, 14,
It is supported by the floor 8 at 14.

From the horizontal corridor floor 8 to the inclined corridor floor 8 '
2, the outer cylinder 4 is rotated in the opposite direction to the arrow a in FIG. 3 by the force of the coil springs 7, 7 as shown in FIG. The drive wheels 6, 6 can be crimped to the boundary between the horizontal corridor floor surface 8 and the upward inclined corridor floor surface 8 '. This boundary portion is far from the lower surface of the central portion of the chassis 1.

Next, in the case of changing the direction of the chassis 1 at a right angle in the orthogonal corridor, the driving brake motor 10 is rotated in the reverse direction, and the forward / reverse deceleration rotation shaft 2 is rotated in the direction of arrow a in FIG. One end of the rotating shaft 2 on the side of the rotating shaft 2 is reversely rotated along with the rotating shaft 2, and the coil springs 7 and 7 are closely attached and fixed to the inner cylinders 17 and 17, and the outer cylinder 4 is rotated in the arrow a direction. As a result, the two legs 5, 5 and the left and right traveling drive wheels 6, 6 are lifted from the corridor floor surface 8 (FIG. 6).
Since the vehicle chassis 1 is supported only by 14, 14, 14, the chassis 1 can be rotated at a right angle by manually pushing the direction of the chassis 1 in the center of the orthogonal corridor without making a large detour around the rectangular corridor.

After rotating at a right angle, the forward / reverse driving brake motor 10 is normally rotated to normally rotate the forward / reverse deceleration rotating shaft 2 in the direction opposite to the direction of the arrow a. The drive wheels 6, 6 are crimped on the floor surface 8, and the coil springs 7, 7 are the inner cylinder 1
It is possible to move the chassis 1 by moving the traveling drive wheels 6 and 6 away from the wheels 7 and 17 by the force thereof.

[0011]

EXAMPLE A storage box 13 is provided on a chassis 1, and a plurality of shelves 12 'are provided in the storage box 13. Each of the shelves 12' supports a serving tray 12 and an opening / closing door 18 is provided on a side surface thereof.

Flexible wheels 14 (casters) are provided at the four corners of the lower surface of the chassis 1 and can move on the floor 8 of the corridor.

A forward / reverse deceleration rotation shaft 2 orthogonal to the traveling direction of the chassis 1 is horizontally installed in the center of the lower surface of the chassis 1, and an outer cylinder is provided in the center of the rotation shaft 2 via bearings 3 and 3. 4 are set concentrically.

A frame 1 extending in one direction is provided at both ends of the outer cylinder 4.
9 are provided, and disks 20 and 20 are fixed to both ends of the rotating shaft 2 in the rotating direction by a key 21, and these disks 20 and 20 are provided with flanges 22 on the outside. One end of the coil springs 7 and 7 is fixed to a flange 22 portion opposite to the frame 19 extending to the other side, and the other ends of the coil springs 7 and 7 are fixed to the frame 19 extending to the above one side, and both ends of the outer cylinder 4 are fixed to each other. Cylinders 17 and 1 which support coil springs 7 and 7 (torsion springs) wound in the opposite direction to each other and are arranged inside the coils of the springs 7 and 7.
The outer end of 7 is connected to the discs 20, 20.

Therefore, when the forward / reverse deceleration rotation shaft 2 is stopped by the brake of the brake motor 10, the frame 19 extending in one direction is urged downward by the force of the coil springs 7, 7 and is moved forward and backward at the tip of the frame 19. The two crotch legs 5 which are rotatably supported around the axis are pivoted downward, and the traveling drive wheels 6, 6 at both ends thereof are pressed against the corridor floor surface 8 by the force of the springs 7, 7. The traveling drive wheels 6, 6 can be rotated by the traveling drive motor 16 via the differential gear 15 to drive the chassis 1.

The drive shafts 23, 2 of the left and right traveling drive wheels 6, 6
3 is built into the pipes 23 'and 23' fixed to both ends of the bifurcated leg 5, the pipes 23 'and 23' are connected by a differential gear housing 24, and the input shaft of the built-in differential gear 15 is run. Drive motor 1
6 output shafts are connected (Fig. 5). It is possible to run the chassis 1 by crimping it onto the floor 8'of the corridor without floating.

A forward / reverse drive brake motor 10 is provided at one end of the forward / reverse deceleration rotation shaft 2 via a forward / reverse drive speed reducer 9 and a deceleration controller 25. When the moving shaft 2 is rotated in the reverse direction, both ends of the coil springs 7, 7 on the side of the flanges 22, 22 rotate in the opposite direction, and the coil springs 7, 7 are tightened in the direction opposite to the urging direction.
The frame 19 extending in one direction, the crotch leg 5, and the traveling drive wheels 6, 6 are rotated around the forward / reverse deceleration rotation shaft 2 as a center by being brought into close contact with the outer surface of 7 and further rotated in the opposite direction. The drive wheels 6 and 6 can be supported above the corridor floor surface 8 and the carriage 1 can be supported only by the free wheels 14, 14, 14 and 14 at the four corners. The direction can be changed to a right angle.

After the direction is changed, the brake motor 10 is normally rotated and the forward / reverse deceleration rotation shaft 2 is normally rotated to rotate to the original position, whereby the frame 19 and the crotch leg 5 extending in one direction are lowered. It is possible to rotate the traveling drive wheels 6, 6 to the corridor floor surface 8 by the force of the coil springs 7, 7 to drive the traveling wheel wheels 6, 6 to travel on the corridor floor surface 8.

Further, as shown in FIGS. 5 and 7, the central portion of the bifurcated leg 5 is rotatably pivoted in the left-right direction by the front-rear direction shaft 27 at the tip of the frame 19 extending in one direction, so that the corridor floor surface 8 is supported. Unevenness 2
Corresponds to 8.

The reference numeral 26 in the figure indicates the forward / reverse deceleration rotary shaft 2.
Bearing.

[0021]

As described above, according to the present invention, not only can the vehicle drive on the corridor floor surface by the left and right traveling drive wheels provided at the lower central portion of the chassis of the catering car, but also from the horizontal corridor floor surface to the inclined corridor floor surface. Even if the boundary between both floors becomes large from the chassis during the transition, the traveling drive wheels descend due to the force of the coil spring and press against the corridor floor surface at the boundary, and the traveling drive wheels rise above the floor. Not only can it smoothly move to the floor surface of the uphill corridor but also when changing the direction of a narrow orthogonal corridor floor surface, the drive wheels can be lifted from the corridor floor surface by reversing the forward / reverse drive brake motor. The effect is that the chassis can be rapidly turned only by the free wheels to change the direction at a right angle.

[Brief description of drawings]

FIG. 1 is a side view of a catering vehicle equipped with a traveling device of the present invention.

FIG. 2 is a side view of a state in which a horizontal corridor floor is shifted to an upwardly inclined corridor floor.

FIG. 3 is a side view of an elevating mechanism for traveling drive wheels.

FIG. 4 is a side view of a traveling drive wheel in a lowered state.

FIG. 5 is a partial vertical cross-sectional bottom view of a traveling drive wheel and its operating mechanism.

FIG. 6 is a side view showing a state where the traveling drive wheels are levitated.

FIG. 7 is a front view showing a state where the traveling drive wheels are vertically moved up and down.

[Explanation of symbols]

 1 chassis 2 forward / reverse deceleration rotary shaft 3 bearing 4 outer cylinder 5 2 crotch leg 6 traveling drive wheel 7 coil spring 8 floor 9 forward / reverse drive reducer 10 forward / reverse drive brake motor

Claims (1)

[Claims] 1. A delivery car in which a storage tray capable of storing a serving tray in the form of a shelf is provided on a chassis, and free wheels are provided at four corners of the underside of the chassis. A forward / reverse deceleration rotation shaft orthogonal to the is provided in the horizontal direction, an outer cylinder is provided in the center of the rotation shaft via a bearing, and the center of the two-legged leg is fixed to the outer cylinder in the rotation direction. The driving shafts are provided at both ends of the two-legged legs, and coil springs for urging the two-legged legs downward are provided between both ends of the outer cylinder and the both ends of the rotary shaft. Reversely and against the biasing force of the coil spring, the two crotch legs are lifted up about the above-mentioned rotation axis to form the traveling drive wheels so that they can be lifted and separated from the floor surface. Machine and a traveling device in a car-car provided with a brake motor for driving the machine in the reverse direction.