JP3580602B2 - Traveling equipment in a catering car - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a travel driving device for a serving car in a hospital or the like.
[0002]
[Prior art]
Since the driving wheels of the conventional catering trucks at hospitals and the like are provided at a fixed position in the center of the undercarriage, when traveling from a horizontal corridor to an uphill corridor, the driving wheels rise from the corridor floor, making traveling difficult. Become.
[0003]
Further, when changing the direction of the orthogonal corridor to a right angle, it is necessary to make a large turn in the traveling direction at a right angle, and it is difficult to make a large turn in a narrow orthogonal corridor. Therefore, there is a problem that the direction cannot be changed to a right angle unless a person raises the chassis.
[0004]
[Problems to be solved by the invention]
The present invention relates to a catering vehicle that not only can drive wheels press easily against the corridor floor and easily move to the uphill corridor even when moving from the horizontal corridor to the uphill corridor, but also can easily perform a right angle direction conversion in a narrow orthogonal corridor. It is intended to obtain a traveling drive device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a serving truck having a storage tray on a chassis capable of storing serving trays in a shelf shape, and a free wheel provided at four corners on the lower surface of the chassis, wherein a central portion of the lower surface of the chassis is provided. , A forward / reverse deceleration rotation axis orthogonal to the traveling direction of the chassis is provided in the horizontal direction, an outer cylinder is provided via a bearing at the center of the rotation axis, and the center of the bifurcated leg is rotated on the outer cylinder. And a driving coil is provided between both ends of the outer cylinder and both ends of the rotation shaft. The bifurcated leg is lifted around the rotation shaft against the biasing force of the coil spring by reversing the rotation shaft, and the traveling drive wheel is formed so as to be liftable and separable from the floor surface. And a forward / reverse drive speed reducer and a forward / reverse drive brake motor.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, when the forward / reverse decelerating rotation shaft 2 is stopped by the brake motor 10 and the serving car 11 travels or moves from the horizontal corridor floor 8 to the ascending floor 8, the coil corrugation 7 on the horizontal corridor floor 8, By the force of 7, the bifurcated leg 5 is pivoted downward about the pivot shaft 2 and the traveling drive wheels 6, 6 at both ends are pressed against the horizontal corridor floor surface 8.
[0007]
In this state, the undercarriage 1 of the serving car 11 can be run by rotating the drive wheels 6 and 6 by the reduction drive motor 16 via the differential gear 15. At this time, the four corners of the chassis 1 are supported on the floor 8 by free wheels 14, 14, 14, 14.
[0008]
When transitioning from the horizontal corridor floor 8 to the upwardly inclined corridor floor 8 ', as shown in FIG. 2, the outer cylinder 4 rotates in the direction opposite to the arrow a in FIG. The crotch leg 5 is further rotated downward, and the left and right drive wheels 6, 6 can be pressed against the boundary between the horizontal corridor floor 8 and the upwardly inclined corridor floor 8 '. This boundary portion is far from the lower surface of the center of the chassis 1.
[0009]
Next, when changing the direction of the chassis 1 in a right angle direction in the orthogonal corridor, the drive brake motor 10 is rotated in the reverse direction, and the forward / reverse deceleration rotation shaft 2 is rotated in the direction of the arrow a in FIG. One end of the rotating shaft 2 is reversely rotated along with the rotating shaft 2, the coil springs 7, 7 are fixed in close contact with the inner cylinders 17, 17, and the outer cylinder 4 is rotated in the direction of arrow a, whereby Since the forked legs 5, 5 and the left and right traveling drive wheels 6, 6 are raised from the corridor floor 8 (FIG. 6), the chassis 1 is supported only by the four free wheels 14, 14, 14, 14 at the four corners. The direction of the undercarriage 1 can be pushed at the center of the orthogonal corridor by hand and rotated at a right angle without largely bypassing the orthogonal corridor.
[0010]
After rotating at a right angle, the forward / reverse drive brake motor 10 is rotated forward and the forward / reverse deceleration rotation shaft 2 is rotated forward in the direction opposite to the direction of arrow a. , 6 are pressed against the floor 8, and the coil springs 7, 7 are separated from the inner cylinders 17, 17, and the chassis 1 can travel by the rotation of the traveling drive wheels 6, 6 by the force.
[0011]
【Example】
A storage 13 is provided on the undercarriage 1, and the storage 13 is provided with a plurality of shelves 12 ′, each of the shelves 12 ′ supports the serving tray 12, and an opening / closing door 18 is provided on a side surface.
[0012]
Wheels 14 (casters) are provided at the four corners of the lower surface of the chassis 1, and can move on the corridor floor 8.
[0013]
A forward / reverse deceleration rotation shaft 2 orthogonal to the traveling direction of the chassis 1 is horizontally installed at the center of the lower surface of the chassis 1, and the outer cylinder 4 is concentric with the center of the rotation shaft 2 via bearings 3 and 3. To be provided.
[0014]
Frames 19 extending to one side are provided at both ends of the outer cylinder 4, and discs 20, 20 are provided at both ends of the rotating shaft 2 by being fixed in a rotating direction by a key 21. , 20 are provided with a flange 22 on the outside, and one end of the coil springs 7, 7 is fixed to a portion of the flange 22 opposite to the frame 19 extending to one side, and the other ends of the springs 7, 7 extend to the above one side. The coil springs 7, 7 (torsion springs) fixed to the frame 19 and wound in opposite directions on both sides of the outer cylinder 4 are supported, and the outer ends of the cylinders 17, 17 arranged inside the coils of the springs 7, 7 Is connected to the disks 20, 20.
[0015]
Therefore, when the forward / reverse decelerating rotation shaft 2 is stopped by the brake of the brake motor 10, the frame 19 extending to one side is urged downward by the force of the coil springs 7, 7, and the front end of the frame 19 rotates around the longitudinal axis. The bifurcated legs 5, which are rotatably supported on the floor, are pivoted downward, and the driving wheels 6, 6 at both ends thereof are pressed against the floor 8 of the corridor by the forces of the above-mentioned ridges 7, 7, so that the driving wheels 6, 6 can be rotated by the drive motor 16 via the differential gear 15 to allow the chassis 1 to travel.
[0016]
The drive shafts 23, 23 of the left and right traveling drive wheels 6, 6 are built in tubes 23 ', 23' fixed to both ends of the bifurcated leg 5, and the tubes 23 ', 23' are connected by a differential gear case 24. The output shaft of the traveling drive motor 16 is connected to the input shaft of the built-in differential gear 15 (FIG. 5). The undercarriage 1 can be run by being pressed without being lifted to the corridor floor 8 '.
[0017]
One end of the forward / reverse deceleration rotation shaft 2 is provided with a forward / reverse drive brake motor 10 via a forward / reverse drive reduction gear 9 and a deceleration control device 25. When the coil springs 7, 7 are rotated in the opposite direction, one end of the coil springs 7, 7 on the flange 22, 22 side rotates in the opposite direction, and the coil springs 7, 7 are brought into close contact with the outer surfaces of the inner cylinders 17, 17 in the opposite direction to the biasing direction. By further rotating in the opposite direction, the frame 19 extending to one side, the forked legs 5 and the traveling drive wheels 6, 6 are pivoted up about the forward / reverse deceleration pivot shaft 2, and the drive wheels 6, 6 are raised. The lifting platform 1 can be supported above the corridor floor 8 by the four free wheels 14, 14, 14, 14 only at the four corners, so that it can be turned at right angles about the center of the chassis 1. Can be.
[0018]
After the direction change, the brake motor 10 is rotated forward and the forward / reverse deceleration rotation shaft 2 is rotated forward to rotate to the original position, whereby the frame 19 extending to one side and the two-legs 5 are rotated downward. The driving wheels 6, 6 are pressed against the corridor floor 8 with the force of the coil strips 7, 7, and the corridor floor 8 can be driven by the driving wheels 6, 6.
[0019]
As shown in FIGS. 5 and 7, the center of the bifurcated leg 5 is pivotally supported at the tip of a frame 19 extending to one side by a front-rear shaft 27 so as to be rotatable left and right. Corresponding.
[0020]
Reference numeral 26 in the drawing denotes a bearing of the forward / reverse deceleration rotation shaft 2.
[0021]
【The invention's effect】
The present invention can not only run on the corridor floor by the left and right traveling drive wheels provided at the lower part of the center of the catering car chassis as described above, but also when shifting from the horizontal corridor floor to the ascending corridor floor, both floors Even if the boundary part of the surface is large from the chassis, the driving drive wheel descends due to the force of the coil spring and presses against the floor of the corridor at the boundary part, and the driving wheel smoothly rises and falls without rising from the floor surface When changing the direction of the narrow orthogonal corridor floor surface as well as being able to shift to the corridor floor surface, the driving wheels float up from the corridor floor surface by reversing the forward and reverse drive brake motors, and only the four corner free wheels are used. There is an effect that the chassis can be turned sharply to change the direction at a right angle.
[Brief description of the drawings]
FIG. 1 is a side view of a serving truck provided with a traveling device of the present invention.
FIG. 2 is a side view showing a state where a transition is made from a horizontal corridor floor to an ascending corridor floor.
FIG. 3 is a side view of a traveling drive wheel elevating mechanism.
FIG. 4 is a side view of a traveling drive wheel in a lowered state.
FIG. 5 is a partially vertical bottom view of a traveling drive wheel and its operation mechanism.
FIG. 6 is a side view of a traveling drive wheel floating state.
FIG. 7 is a front view of a traveling drive wheel left and right elevating state.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 chassis 2 forward / reverse deceleration rotation shaft 3 bearing 4 outer cylinder 5 two-legged leg 6 running drive wheel 7 coil spring 8 floor 9 forward / reverse drive reduction gear 10 forward / reverse drive brake motor

Claims (1)

In a serving truck, which is provided with storage shelves capable of storing serving trays in a shelf shape on a chassis and provided with free wheels at four corners on the lower surface of the chassis, a forward / reverse direction perpendicular to the traveling direction of the chassis at the center of the lower surface of the chassis. A deceleration rotation shaft is provided in the horizontal direction, an outer cylinder is provided at the center of the rotation shaft via a bearing, and the center of the bifurcated leg is fixed to the outer cylinder in the rotation direction. And a coil spring for urging the bifurcated leg downward between both ends of the outer cylinder and both ends of the rotating shaft is provided, and the rotating shaft is reversed and the coil is driven. The bifurcated leg is lifted around the rotation axis against the urging force of the spring, and the traveling drive wheel is formed so as to be liftable and separable from the floor surface. A traveling device in a catering vehicle provided with a driving brake motor.

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