JPH0833525A - Service wagon - Google Patents

Abstract

PURPOSE:To provide a self-propelled service wagon which can move at low speeds suited to the walking speed of a worker and move even on an uphill slope or stairs. CONSTITUTION:A self-propelled service wagon is formed by providing wheels 2 which are driven by a motor 81 to a vehicle body 1 which contains many food trays. The food service wagon uses an AC servo motor whose revolution is controlled in accordance with the frequency of electric current applied and which increases voltage with a decrease in the frequency as the motor 81. The motor 81 provides a high torque even at a low revolution and can operate the wagon at low speed and even on an uphill slope or stairs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delivery car used in hospitals, other hotels, schools and the like.

[0002]

2. Description of the Related Art For example, when a nurse in each hospital room is to be served at a hospital, tableware with staple foods, side dishes, desserts, etc. are arranged on a tray, and a large number of these trays are accommodated in the serving car. It is carried out by taking out the tray from the delivery car and delivering it to the observer while traveling around each hospital room.

Various kinds of such vehicles have been conventionally provided, for example, Japanese Patent Publication No. 2-14055, Japanese Utility Model Publication No. 3-77190, and Japanese Utility Model Publication 5-179.
As disclosed in Japanese Patent Publication No. 43, Japanese Utility Model Publication No. 6-12653, etc., recently, there have been provided car-serving vehicles having a function of keeping warm and keeping cold. In addition, in the conventional catering car, the catering staff generally pushes or pulls the car to run the car, but if the warming and cooling functions are provided in this way, the catering car will be heavier. Self-propelled catering vehicles have been provided in which the wheels are driven by motors and self-propelled. In such a conventional self-propelled vehicle, a DC motor of a voltage control system or an AC motor of a frequency control system using an inverter is used as a motor for driving wheels.

[0004]

Since the operator operates the catering car while walking, it is necessary to drive the catering car at an extremely low speed of about 1 km to 3 km per hour according to the walking speed of the operator. However, in the voltage-controlled DC motor, the voltage is lowered to rotate the motor at a low speed so that the motor runs at a low speed. However, when the voltage is lowered to rotate the motor at a low speed, the voltage is lowered. As a result, the output torque decreases, and there is a possibility that it may not be possible to climb an uphill or a step.

Further, in an AC motor of a frequency control system using an inverter, the frequency of the applied current is lowered to rotate the motor at a low speed so that the motor runs at a low speed. However, if the frequency is lowered, the voltage also drops. There is a problem in that the output torque may decrease and it may not be possible to climb uphills or steps. The present invention has been made in view of the above points, and provides a self-propelled catering vehicle that can be run at a low speed according to the walking speed of an operator and can be run on an uphill or a step. That is the purpose.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a self-propelled catering vehicle formed by providing traveling wheels 2 driven by a motor 81 on a vehicle body 1 that accommodates a large number of trays 31 for feeding. In the above, as the motor 81, an AC servomotor having a control unit for controlling the rotation speed according to the frequency of the applied current and increasing the voltage as the frequency is lowered is used. .

Further, in the present invention, it is preferable to provide a suspension mechanism formed by providing wheels 2 at both ends of a seesaw plate 84 which is pivotally supported on the lower surface of the vehicle body 1 so that the center portion can be rotated up and down. Further, in the present invention, it is preferable to provide an interlock mechanism that does not operate the motor 81 when a charging cord from the power source is connected for charging the battery 144 that is the power source of the motor 81.

[0008]

By using as the motor 81, an AC servomotor having a control unit for controlling the rotation speed according to the frequency of the applied current and for increasing the voltage as the frequency is lowered, the motor 81 is rotated at a low speed. Even if it is done, a high torque can be obtained, and the catering car can be run at a low speed and can also be run uphill or in steps.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG.
4 to FIG. 4 show the entire structure of an embodiment of the catering car according to the present invention, in which wheels 2 are provided on the lower surface of the vehicle body 1. As shown in FIGS. 1 and 2, the wheel 2 is composed of a pair of drive wheels 2a driven by a motor 81 such as an AC servomotor, and a pair of steering wheels 2b which can swing and rotate. The drive wheel 2a is attached to a position near the rear portion of the vehicle body 1, and the steering wheel 2b is attached to a front portion of the vehicle body 1.

The vehicle body 1 includes a trolley 82 having wheels 2 attached to its lower surface, a box-shaped warm / cool box 3 made of metal such as stainless steel having openings 4 on both sides, and the hot / cold box 3 Except for the openings 4 on both sides, its front surface, rear surface, upper surface,
That is, it is formed with the exterior panel 5 of a plastic molded product that is exteriorly mounted on the outer surface of the hot and cold storage 3.
It is fixed on top of 2. Vehicle body 1 of this exterior panel 5
The corners of the four corners have a radius of 10 mm as shown in Fig. 3.
It is formed by adding the above-mentioned radius R. In the embodiment shown in FIG. 4, the exterior panel 5 includes a front exterior panel 5a forming a front surface portion of the vehicle body 1 and a rear exterior panel 5b forming a rear surface portion thereof.
And an upper exterior panel 5c that constitutes the roof portion.

Since the vehicle body 1 is thus covered with the R-shaped plastic exterior panel 5, the vehicle body 1 may collide with the wall surface of the building, equipment, or the like when the catering vehicle is run. Even if it hits a person, the exterior panel 5 having a hardness lower than that of metal and having rounded corners can reduce the damage to these. In addition, the exterior panel 5 prevents the metal material of the cold storage 3 from being exposed, so that the vehicle body 1 can be finished to have a warm appearance, and a more innovative and hygienic image can be given to the viewer. is there. Further, as shown in FIG. 1, the corners of the four corners of the upper and lower ends in the front and rear of the hot and cold storage 3 are formed with radius r having a radius of 5 mm or more. In this way, by attaching the radius r to the four corners of the hot and cold storage 3, cleaning of the four corners with water, wiping, disinfection, etc. is facilitated, and dust, food waste, etc. are not collected in these four corners for hygiene. It can be kept high.

The inner surface of the hot and cold storage 3 made of a metal material such as stainless steel is coated. By coating the inner surface of the warm / cool box 3 in this manner, stains inside the box can be seen at a glance, and it becomes easy to always keep the room hygienic. In terms of safety, it is preferable to use an inorganic (ceramic) paint that has high heat resistance and does not easily change or deteriorate even under high temperature and high humidity. Inorganic paints are preferable because they have excellent stain resistance and are resistant to stains. Further, it is preferable to use a paint having the functions of water repellency, antibacterial property, and antifungal property as this paint, which can keep the inside of the chamber more hygienic. As such an inorganic coating, for example, "Urban Cera CM4050" manufactured by Matsushita Electric Works Ltd. can be used. This is an inorganic coating material containing silicon alkoxide as a main component and a water / alcohol solvent as a solvent, and is excellent in each of the above properties. As the paint, in addition to such an inorganic paint, a fluorine-based paint or the like can be used.

Further, as shown in FIG. 4, a collar bumper 7 made of rubber or plastic having elasticity is attached to the outer periphery of the carriage 82 at the lower end of the vehicle body 1 as shown in FIG. The bumper 7 is provided so as to project outward from the outer surface of the vehicle body 1, and is provided in a skirt-like shape so as to hang down to the lower side of the vehicle body 1 as shown in FIGS. 1 and 2. Further, the bumpers 7 are provided on both sides of the vehicle body 1 between a front bumper 7a provided at a front end portion of the vehicle body 1, a rear bumper 7b provided at a rear end portion of the vehicle body 1, and front and rear bumpers 7a, 7b. Side bumper 7
c, 7c. By providing the bumper 7 at the lower end of the vehicle body 1 as described above, the bumper 7 can absorb the shock even when the catering vehicle hits the wall surface of the building or the equipment / device. The wheel 2 on the lower surface is guarded by a bumper 7 and can prevent the foot from being caught in the wheel 2 under the vehicle body 1. In particular, as shown in FIG. 1, the front bumper 7a is slanted forward so as to project, and the rear bumper 7b is slanted backward so as to project. The bumps 7a and 7b at the front and rear are brought into contact with the projecting tips of the bumpers 7a and 7b when they collide with equipment or devices so that the shock can be absorbed highly.

Here, the vertical width (downward protruding width) of the bumper 7 protruding downward from the lower end of the vehicle body 1 is 50 mm.
It is preferable to set the above (upper limit is about 300 mm). If the vertical width of the bumper 7 is less than 50 mm, the shock absorbing effect at the time of collision cannot be sufficiently obtained. The height of the lower end of the bumper 7 (particularly the side bumper 7c) from the ground is 6
It is preferably 0 mm or less. If the height from the ground exceeds 60 mm, it is easy for the foot to enter under the bumper 7, and moreover, water tends to splash from the bottom of the bumper 7 to the lower surface of the vehicle body 1 when washing and cleaning the catering car. Water may act on the electric components on the lower surface of the main body 1 to cause a functional failure. In particular, if the height is halfway about 60 mm to 150 mm, there is a risk that the instep of the foot may enter under the bumper 7 and be caught between the ground and the bumper 7. Further, as shown in FIG. 1, in the bumper 7, the lower surface of the front bumper 7a is formed on an inclined surface 8a which rises forward, and the lower surface of the rear bumper 7b is formed on an inclined surface 8b which rises rearward. By forming the lower surfaces of the front and rear bumpers 7a, 7b on the inclined surfaces 8a, 8b in this way, even if the foot of the operator who pulls the vehicle enters under the front and rear bumpers 7a, 7b, the instep and the heel are not removed. It will not be caught between the ground and the front and rear bumpers 7a and 7b will not hit the ground when the catering vehicle travels from a flat ground to an uphill slope. The inclination angle θ of the inclined surfaces 8a, 8b of the front and rear bumpers 7a, 7b is preferably about 10 to 45 °, and the width dimension of the inclined surfaces 8a, 8b in the front-rear direction is 1
It is preferably at least 00 mm.

FIG. 5 shows the carriage 82 and the wheels 2. As shown in FIG. 5A, a pair of drive wheels 2a are located near the rear of the lower surface of the carriage 82, and a pair of steering wheels 2b are located near the front. Are attached respectively. The pair of drive wheels 2 a is connected to a motor 81 such as an AC servomotor via a transmission 83, and is driven by the motor 81. The pair of steering wheels 2b are formed as free wheels, and are attached to the lower surfaces of both ends of the seesaw plate 84 so as to be swingable and pivotable in a horizontal plane as shown in FIG. 5 (b). A cushioning material 87 such as rubber is attached to the upper surfaces of both ends of the seesaw plate 84. Seesaw plate 84 is trolley 8
2 is arranged in the width direction on the lower surface of 2, and the central portion thereof is attached to the shaft base 85 on the lower surface of the bogie 82 by the shaft 86, and the seesaw plate 84 rotates the seesaw vertically about the shaft 86. Is done. In this manner, the seesaw plate 84 to which the steering wheel 2b is attached is supported on the lower surface of the carriage 82 so as to rotate the seesaw by the shaft 86, thereby forming a suspension mechanism (suspension mechanism) for the steering wheel 2b. It is a thing.

In the conventional catering car, the wheels are directly attached to the lower surface of the catering car, and since the suspension mechanism is not provided, when one of the pair of wheels rides on the step, the catering car tilts and is housed inside. The food on the tray 31 may be spilled. However, in the present invention, by providing the suspension mechanism on the steering wheel 2b as described above, for example, the step 14
When only one steering wheel 2b of the pair of steering wheels 2b, 2b rides on the step 142 when riding over 2, the seesaw plate 84 rotates and tilts as shown in FIG. The step between the facing wheels 2b, 2b is absorbed, and the carriage 82 can be prevented from tilting. In this way, it is possible to smoothly ride over the step 142 and to run smoothly, and also to improve stability of running by always contacting all four wheels when running on uneven road surface. In particular, since it is possible to prevent the dolly 82, that is, the vehicle body 1 from tilting when riding on the step 142,
It is possible to prevent the food on the tray 31 housed inside from spilling. Further, when the seesaw plate 84 is rotated and tilted as described above, the cushioning material 87 provided on the upper surface of the end portion of the seesaw plate 84 abuts the lower surface of the carriage 82, whereby the carriage 82 of the seesaw plate 84 is attached. The impact when the edge hits is absorbed.

A motor 81 for driving the drive wheel 2a of the wheel 2
In the present invention, an AC servomotor is used as the above. As this AC servo motor, a frequency control system in which the number of revolutions is controlled according to the frequency of the applied current is used, and a control unit for increasing the voltage as the frequency of the applied current is lowered is provided. What is done is what is used. The frequency control type AC servo motor controls the rotation speed of the AC motor by detecting the rotation speed of the AC motor with an encoder and feeding back the detection signal to the microcomputer to change the frequency of the variable frequency current. Although it is possible to rotate the motor at a low speed by decreasing the frequency, the voltage is decreased and the output torque is decreased when the frequency is decreased. For this reason, the function of the control unit constituted by the microcomputer is to assist the voltage by increasing the voltage of the applied current as the frequency is decreased, thereby preventing the torque from decreasing. Therefore, the motor 81 can be rotated at a low speed to drive the catering vehicle at an extremely low speed of 1 km to 3 km per hour according to the walking speed of the worker, and a high output torque can be obtained even at such a low speed rotation. In addition, it is possible to drive uphill and over steps.

As the AC servo motor as described above, it is preferable to use an AC servo motor of a vector control system and a slip control system, and a system of controlling by a voltage type current feedback system is preferable. Further, when the wheels 2 are driven by the motor 81 to travel as described above, it is preferable to drive the wheels while controlling the S-shaped travel by the computer. The conventional self-propelled catering car is run with fixed speed control. That is, for example, as shown in FIG. 8B, a speed curve for 8 seconds from the start to the stop of the running is shown in FIG. 8B, where the first 0.5 seconds is accelerated to 0 km / H to 1.5 km / H, For 2 seconds, run at a constant speed of 1.5 km / H, and then for the next 0.5 seconds, 1.5
Accelerate from 3 km / H to 3 km / H, and then for 3 seconds for 2 seconds
After traveling at a constant speed of km / H, 3 km / H for 3 seconds
The vehicle is decelerated to 0 km / H and stopped. In this fixed speed control, a speed change from acceleration to constant speed, a speed change from constant speed to deceleration, and a speed change from deceleration to stop occur rapidly in stages. Meals stored in the car may be spilled. In addition, the stop is a free run stop, and the stop time (stop distance) changes depending on the weight of the catering car, so it is necessary to use a mechanical brake together depending on the weight of the contents stored, especially When stopping on a downhill it cannot be stopped without a brake.

On the other hand, in the S-shaped traveling control, for example, as shown in FIG. 8 (a), the speed curve for 8 seconds from the start to the stop of the traveling is 0 km for the first 3 seconds.
/ H to 3 km / H, the vehicle travels at a low speed of 3 km / H for 2 seconds, then decelerates to 3 km / H to 0 km / H, and then stops. The speed curve of FIG. As can be seen in Fig. 2, the change in speed from acceleration to constant speed, the change in speed from constant speed to deceleration, and the change in speed from deceleration to stop are curvilinear. The food you eat will not spill. Further, at the time of stopping, it is not necessary to operate the brake in order to stop at a predetermined deceleration curve, and it is possible to stop at a predetermined time regardless of downhill or uphill.

Further, when the wheels 2 are driven by the motor 81 to travel as described above, it is preferable that the speed adjustment is controlled by a stepless speed adjustment by a computer. Since the conventional self-propelled catering car has a fixed speed control, for example, three-step shifting of 1 km / H, 2 km / H, 3 km / H, or two steps of 1.3 km / H and 2.5 km / H It is a step change of speed change, and the worker needs to adjust the walking speed to this speed of the catering car, but by performing the stepless speed adjustment control, as shown in FIG. 8C, the accelerator (volume) is opened to a percentage. The speed can be continuously changed in proportion to the walking speed of the worker, and the speed of the serving car can be adjusted. Further, deceleration when turning the catering car and acceleration after turning can be adjusted to an appropriate speed, so that the operation of the wiring car is facilitated and the stored meal is prevented from spilling. In the illustrated embodiment, the handle 15 is provided with the accelerator 155. However, by providing the operation panel 10 with the accelerator, it is possible to change to the fixed speed control.

At the upper part of the front exterior panel 5a at the front of the vehicle body 1, there is formed a recess 9 that opens forward as shown in FIG. 10 is provided. The operation panel 10 is provided with various switches 13 such as a switch for operating a motor for driving the wheels 2, a switch for controlling the heating temperature in the warming box 57 of the warming / cooling room 3 and the cooling temperature of the refrigerator 58. . As described above, the operation panel 10 is provided in the concave portion 9 of the vehicle body 1 so that the switch 13 does not protrude from the surface of the vehicle body 1.
The switch 13 is prevented from being turned on and off by touching, and the safety is improved.

A handle 15 is attached to the front of the vehicle body 1 in order to control the traveling direction of the vehicle. As shown in FIG. 4, the handle 15 is formed in a horizontally long rod shape, and is disposed between a pair of fixed rods 91 that are fixed to the vehicle body 1 by being projected.
Is installed in the recess 9 below the operation panel 10. When the handle 15 is provided so as to protrude from the surface, the handle 1 protrudes from the car when a person is caught between the car and the wall.
5 may be caught between the wall and the handle 15, and the handle 15 may come into line contact with the body to concentrate the force on this part, and in some cases, may cause an injury such as a bone fracture. By providing the handle 15 so as not to protrude from the surface of the vehicle body 1 by being provided in the recessed portion 9, even if the body is sandwiched between the car and the wall, the body is in surface contact with the surface of the car. Therefore, it is possible to prevent injuries from being caused by concentration of force. The handle 15 may be provided on the rear surface in addition to the front surface of the vehicle body 1 as shown in FIG. 1. However, when the handle 15 is provided on the rear surface as described above, the rear exterior panel 5b of the vehicle body 1 is similar to the above. A recess 9 is provided in the handle 1 so as not to project from the surface of the vehicle body 1 in the recess 9.
5 is attached.

Further, a workbench 16 is attached to at least one of the front surface and the rear surface of the vehicle body 1. In the embodiment of FIG. 4, a shallow recess 1 is formed below the recess 9 of the front exterior panel 5a.
7 is recessed, and the workbench 1 is provided in the upper end of the recess 17.
The workbench 16 is attached by pivotally attaching one end of 6 up and down. The workbench 16 is rotatable between a state in which it is hung down and stored in the recess 17 and a state in which it is rotated upward and horizontally protrudes from the vehicle body 1, as shown in FIG. A lock mechanism (not shown because any conventionally known mechanism can be adopted) is provided for holding the work table 16 in a state of being horizontally rotated. By providing the workbench 16 in this way, it is possible to use the workbench 16 for serving food, and also to use it as a table for various kinds of work and recording. Further, when the workbench 16 is not used, the workbench 16 is housed in the recess 17 so that the workbench 16 does not get in the way.

FIG. 7 shows the structure of the brake lever 90. The brake lever 90 has a bar piece 90a having substantially the same length as that of the bar-shaped handle 15, and lever pieces 90b, 90b.
90b is formed by bending. The brake lever 90 is arranged parallel to the lower side of the handle 15 as shown in FIG. 7 (a), and as shown in FIG. 7 (b),
In order to support both ends of the handle 15 to the vehicle body 1, the tip of the lever piece 90b is pivotally supported by a receiving piece 92 provided on a fixed rod 91 protruding from the vehicle body 1 so that the handle 15 is supported by the vehicle body 1. It is installed in close proximity. Further, a wire fixing piece 93 is extended to the receiving piece 92, and the tube 94a of the brake wire 94 formed by passing the wire 94b through the tube 94a is attached to the wire fixing piece 93. Brake wire 9
One end of the wire 94b of No. 4 is connected to the lever piece 90b of the brake lever 90, and the other end of the wire 94b is connected to the brake mechanism provided on the wheel 2. Any known brake mechanism can be adopted.

Brake lever 9 formed as described above
0, the lever piece 90b is rotated upward by pulling the bar piece 90a upward, and the wire 94b of the brake wire 94 is pulled upward by the lever piece 90b. In response to this, the brake mechanism is actuated to apply a braking force to the wheels 2 to stop the traveling of the catering car.

[0026] In the conventional catering car, a brake having a mechanism similar to a hand brake of a bicycle is provided. However, when operating the brake, it is necessary to use the other hand that does not hold the handle, and this other hand is used. It is necessary to release the hand holding the handle when it is closed, which is a safety issue. However, according to the present invention, when the brake lever 90 is operated in this manner, the brake lever 90 is arranged in the vicinity of the lower side of the handle 15, so that it is not necessary to release the hand from the handle 15, and the handle 15 is held while being held. The finger (mainly the thumb) of the hand can be hung on the bar piece 90a of the brake lever 90, and the brake lever 90 can be safely operated. In addition, the brake lever 90 is the handle 15
Since it is provided in parallel with, the brake lever 90 can be operated as it is, no matter what part of the handle 15 is gripped.

Openings 4 on both sides of the heating / cooling box 3 of the vehicle body 1
As shown in FIG. 1, a column 19 is provided at the center in the front-rear direction, and a hot air blowing duct 20 is attached to the center of the inside of the warm / cool box 3 at a position between the columns 19 on both sides. As shown in FIG. 13, the hot-air blowing duct 20 is formed in a hollow plate shape, and by mounting the hot-air blowing duct 20 in the warm / cool box 3, the hot-air blowing duct 20 shown in FIG.
As described above, the inside of the heating / cooling compartment 3 is partitioned into a front chamber 21 in the front half and a rear chamber 22 in the rear half. The inside of the hot air blowing duct 20 is a pair of partition plates 2 as shown in FIG.
Partitioned by 3, the heating path 24 in the center and the delivery path 2 on both sides
5, 25 are formed. The partition plate 23 is arranged so as not to reach the lower end portion of the blowing duct 20, and the heating path 24 and the delivery paths 25 on both sides are communicated with each other by a communication part 26 below the partition plate 23 as shown in FIG. I am allowed. Hot air blowout ports 30 are provided on both sides of each delivery path 25 at regular intervals in the vertical direction. A large number of trays 31 are held in a partition 55, which will be described later, in the hot / cold box 3 arranged vertically. The hot air blowing ports 30 are arranged so as to be positioned between the trays 31 adjacent to each other. Are arranged and provided.

On both sides of the hot air blowing duct 20, hot air suction ducts 28 as shown in FIG. 13 are erected inside the hot and cold storage 3, and hot air circulation fans 27 are attached to the upper ends of the hot air suction ducts 28, respectively. is there. The hot air circulation fans 27 are connected to both sides of the heating passage 24 at the upper end of the hot air blowing duct 20, respectively.
As shown in FIG. 1 and FIG. 2, each hot air circulation fan 27 is attached to the upper surface of the hot and cold storage 3, and is covered and hidden by the upper and lower exterior panels 5c. The hot air suction duct 28 is shown in FIG.
0, as shown in FIG. 11 and FIG. 12, hot air blowing duct 2
It is arranged at the center in the width direction of the hot and cold storage 3 orthogonal to the central portion of 0, and hot air suction ports 32 are provided on both sides of the hot and cold storage 3 at regular intervals. The hot air inlet 32 is provided at the same height as the hot air outlet 30.

A heater 34 is attached in the heating passage 24 of the hot air blowing duct 20 to heat the air passing through the heating passage 24. However, a heater unit 35 as shown in FIG. By mounting the heater 34, the heater 34 can be mounted. The heater unit 35 is made by mounting a plurality of upper and lower heaters 34 in a flat rectangular tubular body 36 having upper and lower openings. As the heater 34, a sheathed heater with fins or the like is used. be able to. Also, each heater 34 is shown in FIG.
As shown in FIG. 6 (b), the heaters 34 that are vertically adjacent to each other are displaced in the front-rear direction so as to be provided in a zigzag arrangement. By arranging the heaters 34 vertically adjacent to each other in such a manner that the heaters 34 are vertically adjacent to each other, it is possible to reduce the amount of air passing through the heating passage 24 without coming into contact with the heater 34, and it is possible to enhance the efficiency of heat exchange with air. It is a thing. In the embodiment of FIG. 16, the distance L ₁ for shifting the heater 34 back and forth is set to 15 mm. Further, when the heater 34 approaches the wall surface of the cylindrical body 36, the amount of heat absorbed by the wall surface as radiant heat increases. Therefore, the distance L ₂ between the heater 34 and the wall surface of the cylindrical body 36 is set to 5 mm or more, and the heating of air by the heater 34 Also, it is preferable to reduce the radiant heat.

Here, two heater circuits 3 are provided by the heater 34 incorporated in the heater unit 35.
9 and 40 are formed, two heater circuits 39 and 40 are simultaneously turned on and off to adjust the temperature, and one heater circuit 39 (or 40) is turned on.
And turn off the other heater circuit 40 (or 39)
The temperature can be adjusted delicately. In order to divide the heater 34 into two sets of heater circuits 39 and 40 in this way, one heater circuit 39 is formed by setting every other heater circuit 34 as one set, and another every other heater circuit 34 as one set. Another heater circuit 40 is constructed. That is, as shown in FIG. 16A, “A-1”, “B-1” ...
17A, it is shown as “A-
One heater circuit 39 is configured by the heaters 34 of "1" to "A-6", and "B-1" to "B" as shown in FIG.
Another heater circuit 40 is configured by the heater 34 of "-6". In this way, by setting the heaters 34 placed one by one, when one heater circuit 39 (or 40) is turned off and the other heater circuit 40 (or 39) is turned on, it is turned on. It is possible to dispose the heaters 34 that are present every other one so that the heaters 34 that are generating heat are not partially concentrated in the heating path 24, and the heat exchange efficiency can be improved.

The heater unit 3 produced in this way
As shown in FIG. 15, the hot air blowing duct 20 having the heater 34 attached therein can be formed by inserting and mounting 5 in the heating path 24 as shown in FIG. Further, in the hot air blowing duct 20, as shown in FIG. 15A, a rectifying plate 37 is attached between the lower end of the delivery passage 25 and the communication part 26 at the lower end of each partition plate 23. As the current plate 37, a wire mesh or a punching metal having a large number of small holes formed on the entire surface can be used, and the aperture ratio is 20 to 8.
0%, preferably 40 to 60% is suitable. The hot air passing through the heating path 24 from the top to the bottom while being heated by the heater 34 collides with the bottom surface of the hot air blowing duct 28 to change its direction, and enters the delivery path 25 to enter the hot air blowing port 3
Although it is blown out from 0, the hot air becomes a turbulent flow when it collides with the bottom surface of the hot air blowing duct 28, and when the hot air enters the delivery path 25 in a turbulent manner, the hot air can be blown out uniformly from the hot air blowing port 30. Can not. For this reason, a rectifying plate 37 is provided in the turbulent flow region at the lower end of the delivery passage 25 so as to rectify the hot air that has collided with the bottom surface of the hot air blowing duct 28 and becomes turbulent, and is rectified as a laminar flow. Hot air is introduced into the outlet 25, and hot air outlet 30
It is designed so that hot air can be blown out evenly.

Further, the front chamber 21 and the rear chamber 22 of the hot and cold storage 3
Square columns 41, 41 made of stainless steel or the like are erected at approximately the center of each of them, and horizontal rods 42 made of aluminum or the like are provided on both sides of each column 41 as shown in FIG. It is projected. A large number of horizontal rods 42 are provided in parallel with the pillar 41 in the vertical direction, and are arranged at the same height as the hot-air blowing duct 20 or the hot-air sucking duct 30 or the hot-air sucking port 32. They are arranged in parallel.
In FIG. 18, reference numeral 43 denotes a receiving bar made of heat-resistant plastic such as ABS. As shown in FIG. 19, the upper end portion is formed as a receiving portion 44 having a trapezoidal cross section, and the lower end surface extends over the entire length in the longitudinal direction. A slit-shaped recess 45 that opens downward is provided. Further, the center portion of the receiving bar 43 is formed as a hollow portion 46 for insertion that opens to the front and rear, and a semicircular guide tongue piece 110 is formed on the front end surface of the receiving bar 43.
Is protruding. In FIG. 18, reference numeral 47 is a tray receiver, which is formed of a metal plate such as aluminum or stainless steel and has an L-shaped cross section. Reference numeral 48 is a side cover for makeup which is formed of a stainless plate or the like, and has upper locking pieces 49a at the upper and lower ends.
The lower locking piece 49b is provided by bending and the fixing piece 50 is provided at the front end. Reference numeral 51 is a heat insulating material formed of polyurethane foam, polystyrene foam, polyethylene foam, honeycomb core, or the like. 111a and 111b are end plates made of stainless steel or the like, formed to have a size slightly larger than the width dimension of the end surface of the receiving bar 3, and locking flanges 112 are provided on both side edges by bending. At the same time, a through hole 113 is formed in the central portion.

When the receiving bar 43 and the tray receiver 47 are attached to the column 41, the end plate 111a is first attached to the end face of the receiving bar 43 on the side of the base side where the guide tongue 110 is not provided. This installation is the end plate 1
This can be done by receiving a screw from the screw hole 114a of 11a and screwing it into the screw hole 114b of the end face of the crosspiece 43. Next, the receiving rods 43 are inserted into the horizontal rods 42 by inserting the horizontal rods 42 into the insertion hollow portions 46, and the tray receivers 47 are arranged on both sides of the receiving rods 43 below the receiving portions 44. , Screw vertical tray 4 of tray receiver 47
7a through screw hole 114c to receiving bar 43 through screw hole 114d
Then, the receiving bar 43 is fixed to the horizontal rod 42 and the tray receivers 47 are attached to both sides of the receiving bar 43, respectively. After this, a heat insulating material 51 is laid on the outer surface of the vertical piece 47a of each tray receiver 47, and the side cover 48 is further placed from above.
And the end portion of each side cover 48 on the column 41 side is inserted into the inside of the locking brim 112 of the end plate 111a fixed to the receiving bar 43 to be locked, and the receiving bar 4
3 is covered with another end plate 111b, and the locking flange 112 of this end plate 111b is attached to each side cover 4
8 is engaged with the outer surface of the end portion on the side opposite to the column 41, and the screws 4 are received from the screw holes 114a of the end plate 111b.
The side cover 48 is fixed by screwing the end plate 111b into the screw hole 114b of the tip end surface of the No. 3 and fixing the end plate 111b. In this way, as shown in FIGS. 20 and 21, the tray receivers 47 can be attached to both sides of the receiving bar 43 so that the horizontal pieces 47b project from the lower side of the receiving portion 44 to both sides. .

In FIG. 22, reference numeral 116 denotes a shutter plate, which is formed of plastic such as ABS into a thin and elongated plate shape. The shutter plate 116 is formed slightly longer than the receiving bar 43, and the locking notch 11 is formed on the upper surface of the tip thereof.
7 is provided so as to open upward, and the locking notch 117
The tip is formed as an arcuate guide tongue 118. Further, a cutout recess 119 is formed in the center of the upper surface of the shutter plate 116, and a recess 120 is formed in the front and rear thereof. In FIG. 22, reference numeral 121 denotes a holding spring formed in a V shape as a whole, and the torsion portion 1 is provided at the center.
21a has leg pieces 121b bent in a C shape at both ends thereof. The pressing spring 121 and the shutter plate 116 are arranged with the pressing spring 121 placed on the shutter plate 116 and the leg pieces 121b inserted in the recesses 120.
It is inserted from below into the slit-shaped recess 45 of the receiving bar 43. The twisted portion 121a of the pressing spring 121 is housed in the cutout recess 119. At this time, the guide tongue piece 118 of the shutter plate 116 is projected forward from the notch 122 at the lower end of the end plate 111b attached to the tip end surface of the receiving bar 43, and the shutter plate 116 is
Of the locking notch 117 of the end plate 111b
It is inserted in the upper edge of 2. In this way, the shutter plate 116 is arranged in the slit-shaped recess 45 of the receiving bar 43 so as to be vertically movable while being elastically urged downward by the pressing spring 121.

In the same manner as described above, by mounting the receiving bars 43 and the tray receivers 47 on each of the horizontal rods 42 of the columns 41, a partition 55 formed by vertically arranging a plurality of receiving bars 43 as shown in FIG. Can be provided in the hot and cold storage 3, and by the partition 55, as shown in FIG. 11, the front chamber 21 and the rear chamber 22 are connected to the hot storage chamber 57 on the hot air blowing duct 20 side and the front and rear of the hot and cold storage 3. Wall surface 59
It can be divided into the refrigerating chambers 58 on the side of a and 59b. Here, the shutter plate 116 is freely mounted in the slit-shaped recess 45 of the receiving bar 43.
As shown in FIG. 23, since the lower end of the shutter plate 116 contacts the upper end surface of the receiving bar 43 located under the shutter plate 116 by the elastic force of the pressing spring 121, the shutter plate 116 slips out of the slit-shaped recess 45. There is no such thing. The space between the vertically adjacent receiving bars 43 is hermetically sealed by the shutter plate 116 of the upper receiving bar 43 elastically contacting the upper end surface of the lower receiving bar 43. Can be partitioned with the air flow blocked.

The vertical piece 47a and the horizontal piece 4 of the tray receiver 47 are provided.
7b is provided with a hole 56 to reduce the weight. When the holes 56 are provided in this manner, hot air or cold air directly acts on the tray 31 placed on the tray receiver 47 through the holes 56 as shown in FIG. Although the shape and arrangement of the holes 56 are arbitrary, the opening area of the holes 56 should be set to 50% or less of the whole in order to secure the strength of the tray receiver 47. Is preferred.

The surface of the tray receiver 47 made of metal such as aluminum is coated with an inorganic paint or the like. By coating the tray receiver 47 in this way and providing a coating layer on the surface, the surface hardness of the tray receiver 47 can be made smaller than that of the tray 31 made of plastic, and the tray receiver 47 is placed on the tray receiver 47. It is possible to prevent the tray 31 from being scratched when the tray 31 is taken in and out, and to prevent the tray 31 from being soiled by this scratch. Inorganic paints are preferable because they have excellent stain resistance and are resistant to stains. Further, it is preferable to use a paint having the functions of water repellency, antibacterial property, and antifungal property as this paint, which can keep the inside of the chamber more hygienic. Examples of such an inorganic coating material include, for example, “Urban Cera CM405” manufactured by Matsushita Electric Works Ltd.
0 ”can be used. As the paint, in addition to such an inorganic paint, a fluorine-based paint or the like can be used.

As shown in FIG. 12, recesses 125 are provided on the inner surfaces of the front and rear wall surfaces 59a and 59b of the warm / cool box 3 over substantially the entire length thereof. The recess 125 is fitted with a wall plate 126 to be attached. A cold air duct 61 is formed on the wall surfaces 59a and 59b. An evaporator 127 connected to a cooler unit 62 mounted on the lower surface of the vehicle body 1 is mounted in the cold air duct 61, and a cold air suction port 63 provided on the wall plate 126 as shown in FIG. 26.
The cold air duct 61 and the refrigerating chamber 58 are communicated with each other. In addition, the cold air duct 6 is provided at the upper end of each wall plate 126.
1 is provided with an opening 64 for communicating with the refrigerating compartment 58,
A cool air circulation fan 65 is provided in each opening 64 as shown in FIG.
It is attached like 8.

Each cold air duct 61 on each wall surface 59a, 59b
A drain receiver 128 is attached in the lower end portion of each cold air duct 61 to form a drain receiver at the lower end portion of each cold air duct 61. 67 is led out, and the tip of the water draining pipe 67 is inserted into the water receiving tank 68 for connection. The water receiving tank 68 is a plastic container as shown in FIG.
The lid 69 is attached to the upper portion to provide a discharge port that can be opened and closed, and the discharge cock 70 is provided to the lower surface. Further, the water receiving tank 68 is provided with a hole 71 into which the water draining pipe 67 is inserted. The air in the cold air duct 61 is cooled by the evaporator 127, but when the air is cooled, the water condensed on the evaporator 127 is collected in the drain receiver at the lower end of the cold air duct 61, and this water passes through the water drain pipe 67. It is designed to flow into the tank 68. The water receiving tank 68 is attached to the lower surface of the vehicle body 1 as shown in FIG. That is, as shown in FIG. 29A, the fixing hook tool 72 is attached to the lower surface of the vehicle body 1, and the lower horizontal pieces 73 are respectively attached to the lower end and the upper part of the fixing hook tool 72.
A pair of upper horizontal pieces 74 are provided, and each lower horizontal piece 73 is provided with a lower hooking piece 75 that bends downward, and an upper hooking piece 76 that bends upward is provided at the tip of each upper horizontal piece 74. Also in FIG.
(B) shows a fixed belt 77 made of rubber or the like, and hooking rings 78 are attached to both ends thereof. Then, when fixing the water receiving tank 68 to the fixing hook tool 72 and attaching it to the lower surface of the vehicle body 1, as shown in FIG.
Between the lower horizontal piece 73 and the upper horizontal piece 74 as shown in FIG.
8 and insert it on the lower horizontal piece 73,
The hooking rings 78 on both ends of 7 are attached to the lower hooking piece 75 and the upper hooking piece 7.
The water receiving tank 68 is pressed by the fixing belt 77 and the water receiving tank 68 is hooked on each of them.

Therefore, the water receiving tank 68 can be removed from the fixing hook tool 72 by removing the fixing belt 77 and removing the holding by the fixing belt 77, and the water accumulated in the water receiving tank 68 can be removed by the lid 69. It can be opened and discharged, and the water receiving tank 68 can be cleaned. Further, when the water in the water receiving tank 68 is discharged, since the drain cock 70 is provided on the lower surface of the water receiving tank 68, the drain cock 70 can be opened and discharged without the need to remove the water receiving tank 68. It is possible.

Four doors 101 are attached to each of the openings 4 on both sides of the vehicle body 1. The frontmost door 101a of the four doors 101 opens and closes the refrigerator 58 of the front chamber 21, and is hinged to the side edge in front of the opening 4 of the vehicle body 1 by a hinge. It is designed so that it can be opened like the arrow of 4. Next door 101b is front room 2
The first storage compartment 57 is opened and closed, and is hinged to the support column 19 of the vehicle body 1 by a hinge so that it can be opened as shown by an arrow in FIG. The next door 101c opens and closes the warm storage 57 in the rear compartment 22, is hingedly supported by the column 19 of the vehicle body 1, and can be opened as shown by the arrow in FIG. is there. Next door 101
d is for opening and closing the refrigerator 58 of the rear compartment 22,
The vehicle body 1 is hinged to a side edge portion behind the opening 4 so that the vehicle body 1 can be opened as shown by an arrow in FIG. Further, the ends of the doors 101a and 101b and the door 101
As shown in phantom lines in FIG. 21, the tips of the c and 101d sandwich the guide tongues 110 and 118, respectively, and the receiving bars 4 are inserted.
It is configured to come into contact with the tip of 3 and be closed.

These doors 101 are formed in a double structure as shown in FIG. That is, the two panels 10
2, 102 are arranged in parallel with a space between each panel 10
By attaching a door frame 104 formed of an aluminum sash or the like to the edges of 2, 102, a closed air layer 103 is provided between the two panels 102, 102 to create a double-structured door 101. can do. By providing the air layer 103 to form a double structure,
The heat insulating property of the door 101 can be improved, and the heat can be prevented from escaping from the inside of the warm storage 57 or the refrigerator 58 with high efficiency. The thickness of the air layer 13 is 10 to 20 m
m is preferred. If the thickness of the air layer 13 is less than 10 mm, a high heat insulating effect cannot be obtained. By increasing the thickness of the air layer 13, the heat insulating effect can be enhanced. However, if the thickness of the air layer 13 exceeds 20 mm, the inside of the air layer 13 is increased. Due to the convection of air, the heat insulation cannot be further improved. In FIG. 30, 130 is a packing attached to the door frame 104.

Further, the panel 102 of the door 101 is formed so as to be light-transmitting so that the inside of the refrigerator 57 and the inside of the refrigerator 58 can be confirmed from the outside. In this case, the panel 10
2 is preferably made of transparent plastic such as polycarbonate or acrylic resin which is colored and has an ultraviolet absorbing ability. When the panel 102 having an ultraviolet absorbing ability is used for the door 101 as described above, the ultraviolet light is emitted from the door 1
It is possible to prevent the food from being absorbed by 01 and acting on the food in the warm storage 57 or the refrigerator 58, and to reduce the change or deterioration of the food due to the action of ultraviolet rays. Further, the doors 101 are designed so that they can be opened as shown in the arrow of FIG.
It can be fixed by a hinge in the open state at the angle of.

The temperature sensors 105 and 106 are provided in the above-mentioned warm storage 57 and the refrigerator 58 to control the temperature of heating and cooling, and the temperature sensor 105 is used as shown in FIG. 10 and FIG. Hot air suction duct 28 of the warehouse 57
The temperature sensor 106 is provided in the upper part of FIG.
0 or as shown in FIG. 12, it is provided in the cold air duct 61 of the refrigerator 58. Since the refrigerator 58 of the front chamber 21 and the refrigerator 58 of the rear chamber 22 are independent from each other, it is necessary to provide the temperature sensor 106 for each refrigerator 58, but the refrigerator 57 of the front chamber 21 and the rear chamber 22 is different. Since they are in communication with each other and integrated with each other, it is sufficient to provide only one temperature sensor 105 for the heating cabinet 57.

As described above, the temperature sensors 105 and 106 are both provided in the hot storage 57 and the refrigerator 58 at locations not exposed, and when the hot and cold storage 3 is washed with water, wiped, or disinfected. In addition, the temperature sensors 105 and 106 are not disturbed, and the temperature sensor 10 is used when the tray 31 is taken in and out of the warm storage 57 or the refrigerator 58.
5,106 will not get in the way. Further, since the temperature sensors 105 and 106 are not touched during normal use, damages and failures can be reduced.

The temperature inside the refrigerator 57 and the temperature inside the refrigerator 58 measured by the temperature sensors 105 and 106 are displayed by the temperature indicator 107 provided above the opening 4 at the upper portions of both side surfaces of the vehicle body 1. I am doing it. In the example of FIG. 4, three temperature indicators 1 are provided on each side of the vehicle body 1.
07 is provided so that the temperature of the refrigerator 57 is displayed on the central temperature indicator 107 and the temperature of the refrigerator 58 corresponding to the temperature indicators 107 on both sides, respectively. In the example of FIG. Two temperature indicators 107 on each side
The temperature of the refrigerator 57 is displayed on one temperature indicator 107, and the temperature of the refrigerator 58 is displayed on the other temperature indicator 107.

The temperature indicator 107 is displayed on the vehicle body 1 in this way.
The temperature indicator 10
7 is easier to see, and the temperature in the refrigerator is known during cooking and serving, making it easier to work. The temperature indicator 107 is digitally displayed by using an LED, a liquid crystal or the like, and the numeral is 5 mm or larger. By displaying the temperature with such a large number, it is possible to confirm the temperature of the temperature indicator 107 even if the vehicle is far from the catering car, and it is not necessary to check the temperature every time the car comes near the catering car. The work efficiency can be improved.

In the case of a self-propelled vehicle that has the above-mentioned functions of keeping warm and keeping cold, the motor 81, the heating cabinet 57, the battery 144 for supplying power to the refrigerator 58, the evaporator of the refrigerator 58, and the like. Cooler unit 62 connected to 127, control of motor 81, warm storage 57 and refrigerator 58
Units having a heavy weight, such as a controller 145 having a control circuit for controlling the above, are housed in the lower front and rear portions or the lower surface of the vehicle body 1. For example, as shown in FIGS. 1 and 2, the battery 144 is housed in the rear exterior panel 5b of the rear part of the vehicle body 1, and the controller 145 is housed in the front exterior panel 5a of the front part of the vehicle body 1, respectively. The unit 62 is arranged on the lower surface of the carriage 82 between the drive wheel 2a and the steering wheel 2b. When the units are stored in the ceiling, the height of the serving car becomes high and the center of gravity becomes high, which makes the unit unstable, and maintenance of the units also requires a step, etc., which makes it inconvenient. By storing the components in the lower portion of the vehicle body 1, the overall height of the vehicle body 1 can be reduced, and the units can be finished in a neat appearance without being exposed to the upper portion. By lowering the center of gravity, it is possible to improve the running stability and the parking stability. Further, it is not necessary to use a stepping board or the like for maintenance of the units, which improves workability and safety of maintenance. In particular, by accommodating the units in the lower portion of the vehicle body 1, the lowermost stage of accommodating the tray 31 can be raised, and the work of putting the tray 31 in and out of the vehicle body 1 becomes easy.

Further, the battery 144 is adapted to be charged from a power source in a hospital or the like while the catering service is stopped. Charging is three-phase 20 connected to battery 144
This is done by connecting the charging cord connected to the power supply to the outlet for 0V power supply. This outlet has an interlock mechanism, and the motor 81 is not energized unless the charging cord is pulled out. I'm trying not to be. That is, when the charging cord is plugged into the outlet, the relay operates and the motor 81
An interlock mechanism is provided to prevent power from being supplied to the motor, and the motor 81 cannot be operated unless the charging cord is pulled out, so that the catering car cannot run.

In the conventional catering car, there is a risk that the cord and the outlet may be damaged by forgetting to remove the cord for charging and operating the motor with the motor plugged into the outlet to drive the catering car. Will prevent you from running the catering car while charging, or forgetting to pull out the charging cord to run the catering car, thus preventing damage to the outlet, charging cord, etc. Is something that can be done. Further, it is preferable to provide a lamp 150 that lights up when the charging cord is connected to the outlet on the operation panel 10 as shown in FIG. 9 so as to prevent forgetting to remove the charging cord and to obtain double safety. . Further, in addition to the display by the lamp 150, it is possible to notify the operator by an alarm or voice. In FIG. 9, 10a is a panel for operating the temperature adjustment of the hot storage 57 and the cold storage 58, 10b is a panel for operating the traveling of the catering car, and 151 and 152 are lamps.

Therefore, in the above-mentioned serving car according to the present invention, tableware with main food, side food, dessert, etc. is arranged on the tray 31, and the tray 31 is partitioned by the partition 55.
A large number can be housed and transported in the hot and cold storage 3 while being held in the. As the tray 31, a tray formed by providing a hot food recess 31a for arranging warm food such as rice and miso soup and a cold food recess 31b for arranging cold food such as dessert as shown in FIG. And
The hot food recess 31a and the cold food recess 31b are bridge pieces 31.
They are connected together at c. In the illustrated embodiment, the wider one is used as the hot-corrosion concave portion 31a and the narrower one is used as the cold-corrosion concave portion 31b.

In order to hold the tray 31 on the partition 55, the bridge piece 31c is positioned in front of the partition 55 while the hot food recess 31a is associated with the hot storage 57 and the cold food recess 31b is associated with the refrigerator 58. In this state, the bridge piece 31c is the shutter plate 11 of the upper receiving bar 43 among the receiving bars 43 adjacent to each other above and below the partition 55.
6 and the bridge piece 31c between the lower guide rail 43 and the guide tongue piece 110. Then, the bridge piece 31 c is guided by the guide tongue piece 118 and the guide tongue piece 110 at the tip of the shutter plate 116 so that the bridge piece 31 c is between the shutter plate 116 of the upper receiving bar 43 and the receiving protrusion 44 of the lower receiving bar 43. Plugged in. The tray 31 is formed so that the convex cross-sectional shape of the upper surface of the receiving projection 44 fits into the concave cross-sectional shape of the lower surface of the bridge piece 31c of the tray 31, so that the tray 31 is guided by the receiving projection 44, and the tray 31 of the warm / cooler 3 is cooled. You can insert it in the back. At this time, the shutter plate 116 moves upward in the slit-shaped recess 45 against the elastic force of the pressing spring 121, but the elastic force of the pressing spring 121 causes the shutter plate 11 to move.
The lower surface of 6 is elastically contacted with the upper surface of the bridge piece 31c of the tray 31, and maintains the airtightness between the upper and lower receiving bars 43 to keep the air flow between the heating chamber 57 and the cooling chamber 58 from being interrupted. You can

By thus inserting the tray 31 between the upper and lower receiving bars 43, as shown in FIG.
The hot food recess 31a and the cold food recess 31b of the tray 31 can be placed and held on the lateral pieces 47b of the tray receiver 47, and the tray 31 can be similarly held on the upper and lower receiving bars of the partition 55. By holding between 43,
A large number of trays 31 can be arranged vertically and held. As shown in FIG. 12, the hot food concave portion 31a is inside the hot storage 57, and the cold food concave portion 31b is inside the refrigerator 5.
The tray 31 can be housed in the front chamber 21 or the rear chamber 22 so as to be located in the position 8.

The foods arranged in the hot food recess 31a of the tray 31 are kept warm in the hot storage 57 as follows.
That is, when the heater 34 is energized to generate heat and the hot-air circulation fan 27 is operated, as shown in FIGS.
As shown by the arrow in (b), the air in the warm storage 57 is sucked into the hot air suction duct 28 from each hot air suction port 32, and this air is supplied to the heating path 24 of the hot air blowing duct 20 by the hot air circulation fan 27. To be done. This air is heated by the heater 34 in the heating passage 24 while flowing downward in the heating passage 24 as shown by the arrow in FIG. The air heated in the heating passage 24 is sent from the communicating portion 26 to the delivery passage 25 as indicated by the arrow in FIG. 14 (a), and each hot air outlet 30 of the delivery passage 25 of the hot air outlet duct 20.
13 and FIG. 14 (b), the air is blown into the warm storage 57. By blowing out hot air from the hot air blowing duct 20 in this way, the temperature inside the warm storage 57 is raised, and the air inside the warm storage 57 is sucked in by the hot air duct 28.
The hot air is blown again from the hot air blowing duct 20 after being sucked in by the heater 34 and heated by the heater 34 to circulate the air in the hot warehouse 57 to raise the temperature in the hot warehouse 57 to a predetermined temperature. , Hot storage 57
The inside can be kept at a predetermined set temperature, and by keeping the inside of the warming cabinet 57 at the predetermined temperature in this way, the food on the hot-meal recess 31a of the tray 31 can be kept warm. Is.

Here, the capacity of the hot-air circulation fan 27 is set so that the air in the warm storage 57 can be raised to a predetermined temperature by circulating the air eight times or more. Good to do. Further, the shapes of the hot air outlets 30 provided in the hot air outlet duct 20 and the hot air inlets 32 provided in the hot air inlet duct 28 can be set arbitrarily, but as shown in FIG. Each hot air outlet 30 of the duct 20
It is preferable to set the size of the opening so that the lower one has a smaller opening area and the upper one has a larger opening area. Further, the hot air suction port 3 of the hot air suction duct 28 is
It is preferable to set the size of the opening so that the lower 2 has a larger opening area and the lower one has a smaller opening area. By setting the sizes of the hot air outlets 30 and the hot air inlets 32 in this manner, the amount of air blown out from each hot air outlet 30 of the hot air outlet duct 20 can be made uniform, and the hot air inlet ducts can be made uniform. The amount of air sucked from each of the hot air suction ports 32 of 28 can be made uniform, and the variation in the temperature in the warm storage 57 can be reduced to 5 ° C. or less.

A deodorizing and sterilizing device combining ozone and a ceramic filter is incorporated in the hot air circulating fan 27, and the air treated by this deodorizing and sterilizing device is sent to the hot air blowing duct 28. By doing so, it is possible to prevent the inside of the warm storage 57 from being deodorized and prevent food odors from being transferred, and it is possible to keep the inside of the warm storage 57 hygienic. A conventional catering car uses activated carbon as a deodorizing device. The activated carbon generally has a short life of 3 to 6 months under high temperature and high humidity, but this deodorizing sterilization is a combination of ozone and a ceramic filter. Since the odor adsorbed on the ceramic filter is decomposed one after another by ozone in the device, the effect can be maintained for a long time of about 5 years, and it is not necessary to replace it for a long time. is there.

The food arranged in the cold food recess 31b of the tray 31 is kept cool in the refrigerator 58 as follows. That is, when the cool air circulation fan 65 is operated while the cooler unit 62 is operated, the air in the refrigerator 58 is sucked into the cold air duct 61 from the cold air suction port 63,
It is cooled by the evaporator 127 in the cold air duct 61. The cool air thus cooled is blown into the refrigerator 58 by the cool air circulation fan 65. By blowing out the cool air from the cool air duct 61 in this way, the temperature inside the refrigerator 58 is lowered, and the air inside the refrigerator 58 is sucked into the cool air suction duct 61 to cool the evaporator 1.
After cooling by 27, the cool air is blown again by the cool air circulation fan 65 to circulate the air in the refrigerator 58 to lower the temperature inside the refrigerator 58 to a predetermined set temperature and to cool the inside of the refrigerator 58 to a predetermined temperature. The temperature can be maintained at the set temperature, and by keeping the inside of the refrigerator 58 at a predetermined low temperature in this way, the food on the cold food recess 31b of the tray 31 can be kept cool.

31 to 33 show another embodiment of the present invention, in which the wheel 2 is a pair of drive wheels 2a provided in the central portion of the lower surface of the vehicle body 1,
It is formed by two pairs of steering wheels 2b provided on the front and rear of the lower surface of the vehicle body 1, respectively.

[0059]

As described above, according to the present invention, in a self-propelled catering machine which is formed by providing traveling wheels driven by a motor on a vehicle body which accommodates a large number of trays for feeding, the motor is used as a motor. Since an AC servomotor having a control unit that controls the rotation speed according to the frequency of the applied current and increases the voltage as the frequency is lowered is used, this motor has a high torque even when rotated at a low speed. Therefore, it is possible to drive the catering car at a low speed according to the walking speed of the worker, and also to travel uphill or in steps.

Further, since a suspension mechanism formed by providing wheels at both ends of a seesaw plate pivotally supported on the lower surface of the vehicle body so that the central portion can be rotated up and down, when one of the wheels rides on a step, etc. It is possible to prevent the vehicle body from tilting due to the rotation of the seesaw plate, and to prevent the meal on the accommodated tray from spilling.

Furthermore, an interlock mechanism is provided to prevent the motor from operating when a charging cord from the power source is connected to charge the battery that serves as the power source for the motor. It is possible to prevent damage to the charging cord and the like because it is not necessary to run the car or forget to pull out the charging cord to run the catering car.

[Brief description of drawings]

FIG. 1 is a front view showing an entire embodiment of the present invention with a part thereof cut away.

FIG. 2 is a side view showing an entire embodiment of the present invention with a part thereof broken away.

FIG. 3 is a plan view showing an entire embodiment of the present invention with a part thereof cut away.

FIG. 4 is a perspective view showing an entire embodiment of the present invention.

5A and 5B show a dolly and a wheel portion of an embodiment of the present invention, FIG. 5A is a front view, FIG. 5B is a side view, and FIG. 5C is a bottom view without wheels.

FIG. 6 is a front view of a portion of a truck and wheels showing a traveling state according to an embodiment of the present invention.

7A and 7B show a handle and a brake lever portion of an embodiment of the present invention, where FIG. 7A is a front view and FIG. 7B is a side view.

FIG. 8 (a) is a speed curve diagram by S-shaped traveling control,
(B) is a speed curve diagram based on fixed speed control, and (c) is a speed curve diagram based on continuously variable transmission control.

FIG. 9 is a front view of an operation panel according to an embodiment of the present invention.

FIG. 10 is a front view showing a heating / cooling box according to an embodiment of the present invention with a part thereof omitted.

FIG. 11 is a plan view in which a part of the hot and cold cabinet of the embodiment of the present invention is omitted.

FIG. 12 is a cross-sectional plan view of a hot and cold cabinet according to an embodiment of the present invention.

FIG. 13 is a perspective view of a hot air suction duct and a hot air blowing duct according to an embodiment of the present invention.

14A and 14B are views showing a hot air suction duct and a hot air blowing duct of one embodiment of the present invention, in which FIG. 14A is a schematic front view with a part omitted, and FIG. 14B is a schematic plan view. is there.

FIG. 15 is a view showing a hot air blowing duct according to an embodiment of the present invention, (a) is a front view, (b) is a side view,
(C) is a plan view.

FIG. 16 shows a heater unit according to an embodiment of the present invention, (a) is a front view, (b) is a side view, and (c).
Is a plan view.

FIG. 17 shows a heater configuration of a heater unit according to an embodiment of the present invention, in which (a) and (b) are heater circuit diagrams, respectively.

FIG. 18 is an exploded perspective view showing a configuration of a partition according to an embodiment of the present invention.

FIG. 19 is an exploded perspective view showing a partial configuration of a partition according to an embodiment of the present invention.

FIG. 20 is an exploded front view of a part of the partition according to the embodiment of the present invention.

FIG. 21 is a plan view of a part of the partition according to the embodiment of the present invention.

FIG. 22 is an exploded side view of a part of the partition according to the embodiment of the present invention.

FIG. 23 is a front view of a partition according to an embodiment of the present invention.

FIG. 24 is a front view showing a state in which a partition tray is held according to an embodiment of the present invention.

FIG. 25 is a front view of a part of the hot / cold storage compartment of one embodiment of the present invention.

FIG. 26 is a front view of the inside of the hot and cold cabinet according to the embodiment of the present invention.

FIG. 27 shows a water receiving tank according to an embodiment of the present invention, (a) is a front view and (b) is a side view.

FIG. 28 is a partially cutaway front view of a hot-cold refrigerator according to an embodiment of the present invention.

FIG. 29 is a view showing a state in which the water receiving tank of one embodiment of the present invention is attached, (a) is a sectional view, and (b) is a front view of a fixing belt used for attachment.

FIG. 30 is a partial cross-sectional view of the door according to the embodiment of the present invention.

FIG. 31 is a front view showing the whole of another embodiment of the present invention.

FIG. 32 is a plan view showing the whole of another embodiment of the present invention.

FIG. 33 is a plan view showing the whole of another embodiment of the present invention.

[Explanation of symbols]

 1 vehicle main body 2 wheels 31 tray 81 motor 84 seesaw plate 144 battery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Ota 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Shunsuke Ochiai, 1048 Kadoma, Kadoma City, Osaka Matsushita Electric Works Co., Ltd.

Claims (3)

[Claims] 1. A self-propelled catering vehicle which is formed by providing a traveling wheel driven by a motor in a vehicle body accommodating a large number of trays for feeding, as a motor, depending on the frequency of an applied current. AC equipped with a control unit that controls the rotation speed and increases the voltage as the frequency is lowered
A catering car characterized by using a servo motor. 2. A suspension mechanism formed by providing wheels at both ends of a seesaw plate pivotally supported on the lower surface of the vehicle body so that the center of the vehicle can be rotated up and down. Delivery car. 3. An interlock mechanism is provided to prevent the motor from operating when a charging cord from the power source is connected to charge a battery that serves as the power source of the motor. Serving car described in.