JP3683444B2 - Transporter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transport vehicle having a so-called power assist function.
[0002]
[Prior art]
Of the distribution vehicles used in hospitals and the like, particularly those having a large size and a large weight are known to have a so-called power assist function. In short, this power assist function is equipped with a motor and is connected to the wheel, and when manually pulling or pushing the layout car, the driving wheel is also driven by the motor to make it self-run. Is trying to help.
Here, it is known that when the operator tries to increase or decrease the traveling speed, it is preferable to increase or decrease the speed of the driving wheel accordingly in order to make the arrangement vehicle stably travel.
[0003]
[Problems to be solved by the invention]
For this reason, conventionally, a steering wheel for driving the arrangement vehicle is provided with a volume for adjusting the output of the motor. Further, a sensor handle is referred to as detecting a pulling force of the steering wheel, and the motor output is accordingly adjusted. What was adjusted was adopted, but there was a problem that the equipment including electric wiring was large and the cost was high.
The present invention has been completed based on the above-described circumstances, and an object of the present invention is to achieve stable traveling with a simple structure in a transport vehicle having a power assist function. .
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, in a transport vehicle in which wheels can be driven by a motor in order to assist manual travel operation, a handle for pulling operation is pivotally supported on a side surface of the vehicle main body. A handle and an output adjustment unit of the motor are connected by a wire, and the output of the motor is adjusted by changing a tensile amount of the wire according to a rotation amount of the handle, and The handle is composed of an arm portion pivotally supported by the vehicle body and connected to the wire, and a gripping portion whose one end is pivotally supported by the arm portion and whose other end is gripped by a hand. The gripping portion is swingable with respect to the arm portion, and the arm portion is rotated by pulling the gripping portion manually.
[0005]
[Action and effect of the invention]
<Invention of Claim 1>
Even if the hand holding the handle moves up and down as the worker walks, only the gripping part rotates with respect to the arm part, and the arm part connected to the wire is held in place. When traveling at a constant speed, even if the hand holding the handle moves up and down, the assisting force does not change, and stable traveling is guaranteed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a hot and cold distribution vehicle will be described with reference to FIGS.
As shown in FIG. 1, the warm / cold distribution vehicle of this embodiment includes a distribution vehicle main body 1 (hereinafter simply referred to as a main body) composed of a rectangular heat insulating box having front and rear surfaces opened. The inside of the main body 1 is divided into two rooms in the left-right direction by a heat insulating wall (not shown), and each room is further divided into two left and right by a heat insulating partition wall 2, and the warming room 3 is placed outside each partition wall 2. However, the refrigerator compartment 4 is formed inside, respectively, and these warm compartment 3 and refrigerator compartment 4 make a pair, and each is equipped with the double door type door 5.
A machine room 7 is provided on the upper surface of the main body 1, the two refrigerated rooms 4 are cooled by a common refrigeration unit (not shown) provided in the machine room 7, and each warm room 3 is individually heated. Is heated by.
[0007]
A shelf 9 is formed in a plurality of stages in the warming room 3 and the refrigerating room 4 forming a pair. The tray 10 is placed on both sides of the boundary portion 10A so that food served in a warm state and food served in a cold state are placed separately and placed on the boundary portion. By being placed on the shelf 9 while penetrating the partition wall 2 at a position 10A, the hot food placed on one tray 10 is stored in the warm room 3 and the cold food is stored in the cold room 4, respectively. Stored or refrigerated.
[0008]
As shown in FIG. 2, a pair of wheels 12 and 13 are mounted on the left and right ends of the bottom surface of the main body 1, and a drive wheel 13 is on the right side. As shown in FIG. 3, a motor 15 with a continuously variable transmission 16 is provided in the vicinity of the drive wheel 13. The motor 15 is a direct current type, and a rechargeable battery (not shown) as a drive source is provided in the machine room 7. The output side of the continuously variable transmission 16 is connected to a drive shaft 18 provided with the drive wheels 13 at both ends. The continuously variable transmission 16 is equipped with a speed change rod 20 that is slidable in a direction parallel to the drive shaft 18. The shifting rod 20 is controlled so as to move to the left side of the figure at a low speed and stop, and conversely, when it moves to the right side, the speed controlling rod 20 is controlled at a high speed. It is energized to the stop position.
[0009]
A housing recess 23 is formed on the left side surface of the main body 1, and a handle 25 for pulling and operating the main body 1 is provided in the housing recess 23. As shown in FIGS. 4 and 5, the handle 25 includes a pair of arm portions 26 and a grip portion 27. The arm part 26 is formed in a straight line, and is arranged vertically along the left and right side edges of the housing recess 23, and the lower end of the arm part 26 is supported by the lower shaft 28 so as to be rotatable forward.
The grip portion 27 is formed in a U-shape, and both ends thereof are rotatably supported by the upper shaft 29 on the upper end of the arm portion 26.
[0010]
One end 30 </ b> A of an operation wire 30 is connected to a position on the proximal end side of one arm portion 26 that is eccentric from the lower shaft 28 to the back. As shown in FIG. 2, the other end 30 </ b> B of the wire 30 hangs down along the left side surface of the main body 1, turns the bracket 33, and is routed on the right side along the bottom surface. As shown in FIG. 3, it is turned to the side and connected to the right protruding end of the speed change rod 20 of the continuously variable transmission 16.
As described above, the shifting rod 20 is urged by the return spring 21 to move in the left direction in the figure, so that the wire 30 is tensioned toward the continuously variable transmission 16 and the handle 25 side. 4 is applied to the end portion 30A of FIG. 4 so that the arm portion 26 rotates about the lower shaft 28 in the counterclockwise direction in FIG. 4 and is held in an upright posture. It has come to be.
On the other hand, the gripping portion 27 is in a posture that hangs down between the arm portions 26.
[0011]
Then, the effect | action of this embodiment is demonstrated.
When moving the arrangement wheel, from the state of FIG. 4, when holding the grip portion 27 of the handle 25 and pulling it toward the front, the arm portion 26 rotates clockwise about the lower shaft 28 as shown in FIG. The main body 1 is pulled while rotating in the direction. As the arm portion 26 rotates, the wire 30 is pulled in the direction of the arrow in the figure, and accordingly, the speed change rod 20 of the continuously variable transmission 16 resists the elasticity of the return spring 21 as shown in FIG. By being pulled to the right, the drive wheel 13 is driven at an appropriate speed, and the arrangement vehicle is in a state of self-propelling with the person pulling.
[0012]
While the person who is performing the pulling operation is walking, the position of the hand holding the grip portion 27 moves up and down as the waist moves up and down. However, since the gripping portion 27 is rotatably supported by the upper shaft 29 with respect to the arm portion, even if the hand moves up and down as described above, the gripping portion 27 does not move as shown by the solid line and the chain line in FIG. It only swings and the arm part 26 does not rotate. Therefore, the speed of the driving wheel 13 for assistance does not change, and the allocation vehicle follows the person at a constant speed.
[0013]
In order to move the arrangement car faster, if the person 27 walks a little faster and pulls the grip portion 27 further, the arm portion 26 rotates clockwise about the lower shaft 28 as shown in FIG. Further, the wire 30 is further pulled in the direction of the arrow in the figure, and the speed change rod 20 of the transmission 16 is further pulled to the right in FIG. Driven.
During this time, even if the hand holding the gripping portion 27 moves up and down, only the gripping portion 27 is kept swinging, and the speed of the drive wheel 13 does not change, and the distribution vehicle comes at a constant speed that is increased. Become.
[0014]
When a person walks slowly, the force that pulls the grip portion 27 decreases, so that the wire 30 is returned together with the arm portion 26, and the speed of the drive wheel 13 decreases. If the force pulling the gripping portion 27 is completely removed to stop the arrangement wheel, the arm portion 26 is returned to the original position, the wire 30 is also returned to the original position, the driving wheel 13 is stopped, and the assisting force is lost. It is assumed that
As described above, according to the present embodiment, when the drag wheel is pulled by a simple structure in which the handle 25 to be pulled and the transmission rod 20 of the continuously variable transmission 16 are connected by the wire 30. The optimum assisting force can be obtained, and the arrangement vehicle can be moved easily and stably.
In addition, the handle 25 is divided into an arm portion 26 connected to the wire 30 and a grip portion 27 gripped by a human hand, and has a structure that is freely supported by rotation. Even if the arm part 26 moves up and down, the arm part 26 is held in place only by the swinging part 27 swinging with respect to the arm part 26. That is, when traveling at a constant speed, even if the hand holding the handle 25 moves up and down, the assisting force does not change, and stable traveling is guaranteed.
[0015]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) A handle may be provided on the right side of the main body. In this case, it may be dedicated to the pulling operation exemplified in the above embodiment, or may have a structure that can be pushed.
(2) The means for adjusting the traveling speed of the drive wheels is not limited to that exemplified in the above embodiment, and may be, for example, a means for changing the rotation speed on the output side of the motor via a variable resistor. .
(3) A battery serving as a motor drive source may be mounted on the bottom surface of the main body.
(4) The present invention is not limited to the arrangement vehicle, and can be widely applied to all transport vehicles that can be moved by a steering operation.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a heating / cooling distribution vehicle according to an embodiment of the present invention. FIG. 2 is a perspective view seen from the bottom side. FIG. 3 is a partial front view of a transmission mechanism portion. FIG. 5 is a perspective view thereof. FIG. 6 is a side view showing one embodiment of a handle operation. FIG. 7 is a side view showing another embodiment.
DESCRIPTION OF SYMBOLS 1 ... Main body 13 ... Drive wheel 15 ... Motor 16 ... Continuously variable transmission 18 ... Drive shaft 20 ... Shifting rod 23 ... Housing recessed part 25 ... Handle 26 ... Arm part 27 ... Gripping part 28 ... Lower shaft 29 ... Upper shaft 30 ... Wire 30A, 30B ... (of wire 30) end 33, 34 ... Bracket

Claims (1)

In a transport vehicle in which wheels can be driven by a motor to assist manual driving operation,
A handle for pulling operation is pivotally supported on the side surface of the vehicle body, and the handle and the output adjustment unit of the motor are connected by a wire, and the pulling amount of the wire according to the turning amount of the handle Is configured to adjust the output of the motor by changing,
The handle is pivotally supported by the vehicle main body and connected to the wire, and a gripping portion having one end pivotally supported by the arm and pivotally supported by the other end. The grip portion is configured to be swingable with respect to the arm portion, and the arm portion is rotated by pulling the grip portion manually. A transport vehicle.

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