JP3761768B2 - Heating cart tray - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tray for a heating cart. That is, the present invention relates to a tray that is stored in multiple stages as shelves that can be taken in and out of a service heating cart, and that heats and cooks food with a built-in heater.
[0002]
[Prior art]
For example, a heating cart has been conventionally used for providing services such as meals to passengers in an aircraft. In this heating cart, trays are stored in multiple stages as upper and lower shelves. . Each tray has a built-in heater that heats and heats the food in the placed tableware.
FIG. 2 (2) is an exploded explanatory view of the main part of a tray of this type of conventional example. As shown in the figure, in this type of conventional tray A, the resin-made tray main body B constituting the whole and the heater pad C, which is a heater heating portion disposed partially, have a separate structure. I was doing.
[0003]
That is, in this type of conventional tray A, the heater pad C includes, in order from the top, a metal heating plate D, a heater E, a heat insulating material F, a thermostat G, a fuse H, a wiring J, a resin base frame K, Etc.
In such a heater pad C, the heater E, the heat insulating material F, the thermostat G, the fuse H, etc. are densely covered from above and below by the upper heating plate D and the lower base frame K, and the upper side. The outer peripheral end portion L of the heat generating plate D suspended was fitted into the fitting groove portion M erected on the lower base frame K and attached and fixed with the adhesive sealing material N. FIG. 3 (3) is an enlarged longitudinal sectional view of the main part for explaining such a mounting and fixing state.
And the heater pad C which consists of such a heat_generation | fever plate D, the heat insulating material F, the heater E, the base frame K, etc. was attached and fixed with respect to the tray main body B. That is, the base frame K on the heater pad C side is attached and fixed to the lower tray body B with the screw Q via the sealing O-ring P.
This type of conventional tray A is configured in this way.
[0004]
[Problems to be solved by the invention]
By the way, in such a conventional example, the following problems have been pointed out. As described above, in this type of conventional tray A, in the heater pad C, the outer peripheral end portion L of the upper heating plate D is suspended in the fitting groove portion M erected on the lower base frame K. On the other hand, since it was fitted and fixed by the adhesive sealant N, the cost was high from this aspect and the strength was likely to be insufficient.
That is, in the manufacturing process, after the heat generating plate D is inserted into the fitting groove portion M of the base frame K, a dedicated process for curing the adhesive sealing material N applied and interposed therebetween is required. That is, it had to be fixed until the applied adhesive sealant N was cured.
In such a curing process of the adhesive sealant N, a device / apparatus / equipment for clamping / positioning the heat generating plate D, the base frame K, and further the entire tray A is required. In addition, a place and a space are required, and it takes time and a predetermined curing time is required.
As a result, the manufacturing cost is high, and the manufacturing cost is high because the equipment cost is high, the space is taken, and it takes time and effort.
[0005]
Further, since the heat generating plate D is attached and fixed to the base frame K using the adhesive sealing material N, there is a limit in the adhesive strength, and there is an indication that the heat generating plate D is easily peeled off.
Therefore, in this type of conventional example, in order to cover such a lack of adhesive strength, as the material for the resin tray body B and the base frame K, an expensive material having excellent strength has been selected and used. For example, Ultem of about 2,000 yen / kg is used, and it has been difficult to use a cheaper material and it has been postponed.
As described above, the tray A of this type of conventional example also has a problem in terms of cost because of the high material cost.
[0006]
In view of such circumstances, the present invention was made to solve the problems of the above-described conventional example, and the heating plate of the heater was attached and fixed to the base frame in combination with a lock structure and an adhesive structure. Therefore, it aims at proposing the tray for heating carts excellent in cost and strength.
[0007]
[Means for Solving the Problems]
The technical means of the present invention for solving such a problem is as follows. In other words, this tray has a box shape, is equipped with doors and casters, and is stored in multiple stages as shelves in which the trays can be taken in and out, and the food in the dishes placed on the tray is cooked and kept warm. Used in heating carts.
The tray includes a tray body constituting the whole, a partially arranged planar heater, an upper heating plate that covers the heater from above and below, and a lower base frame. Become. The heat generating plate is fitted and fixed to the base frame at the suspended outer peripheral end portion, and is fixed by a locking structure using a locking projection and a locking hole, and a bonding structure using an adhesive sealing material. It is characterized by that.
[0008]
This tray is like this, so it looks like this: In this tray, the heater partially arranged on the tray body constituting the whole is covered with the upper heat generating plate and the lower base frame, and the outer peripheral end portion where the heat generating plate is suspended is the base. The frame is fitted and fixed by using a lock structure and an adhesive structure together.
Therefore, when this tray is manufactured, first, a lock structure is realized by fitting, and the heat generating plate is positioned, mounted and fixed to the base frame, so the adhesive sealing material that has been applied and interposed as it is after the fact Is cured and an adhesive structure is realized.
In this way, a dedicated process for curing the adhesive sealant is not required, so that no equipment or space is required, the assembly process is simplified and the time is shortened. In addition, the fixing and fixing strength is improved by the lock structure and the adhesive structure, and the strength of the tray main body and the base frame does not need to be particularly considered, and an inexpensive resin can be used.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. FIGS. 1 and 2 (1), FIG. 3 (1), (2), etc. are provided for explaining the embodiment of the present invention.
1 is a longitudinal sectional view of the main part of the tray, FIG. 2A is an exploded explanatory view of the main part of the tray, and FIG. 3A is a main part of the tray before mounting and fixing. An enlarged longitudinal sectional view, FIG. 3B, is an enlarged longitudinal sectional view of the main part of the tray after being mounted and fixed.
4 (1) is a plan view of an example of the tray, FIG. 4 (2) is a plan view of another example of the tray, and FIG. 4 (3) is a main part of the heating cart. FIG. FIG. 5 is a process perspective view showing an example of a meal providing service using a tray. FIG. 6 is a perspective view of the heating cart.
[0010]
<About Heating Cart 1>
First, the heating cart 1 as a heating cart will be described with reference to FIGS.
This heating cart 1 is used when providing services such as meals to passengers in, for example, airplanes and bullet trains, and is provided with a door 2 and casters 3 and is moved and transported by hand. Stored as appropriate.
The heating cart 1 includes a top plate 4, a floor plate 5, left and right side plates 6, a rear plate 7, etc., has a box shape, a door 2 is attached to the front surface, and a caster 3 is attached below the four corners of the floor plate 5. Yes.
The top plate 4, floor plate 5, side plate 6, rear plate 7, door 2, etc. are each made of a panel structure made of heat insulating material. Each corner type material made of light metal arranged as a frame vertically and horizontally, that is, vertically, left and right, front and rear, etc. It is assembled. The example in FIG. 6 is of a type in which the door 2 is arranged instead of the rear plate 7 (see FIG. 5), and the door 2 is provided at the front and rear.
[0011]
On the inner surfaces of the right and left side plates 6 of the heating cart 1 for service, guide rails 8 serving as trays are fixed in multiple stages in the upper and lower sides while being opposed to each other at the same height level.
A large number of substantially flat trays 9 are held between the left and right guide rails 8 as shelves that can be taken in and out. In other words, the trays 9 are mounted and stored in the heating cart 1 in multiple stages as upper and lower shelves that can be taken in and out.
Each tray 9 is made of a resin and includes a heater pad 10. A planar heater 11 that generates heat when energized is incorporated in the heater pad 10. The heater pad 10 heats and heats the meal in the placed cathay roll, that is, the food 13 in the tableware 12.
As the food 13, food, such as cooking, other side dishes, rice, noodles, pasta, bread, etc., can be considered, and the heat generated by the heater 11 is either simply cooked or cooked and kept warm afterwards. Various patterns are conceivable, such as whether the food that has been separately cooked in advance is kept warm, or what has been cooked separately in advance is further cooked.
[0012]
In FIG. 6, 14 is a cart side connector attached to the upper portion of the heating cart 1, and the cart side connector 14 is connected to the power supply side connector 15 on the outside aircraft side, whereby the inside of the heating cart 1. Via the wiring, its contact terminal (not shown) of the pantograph structure, the contact terminal 16 which is the contact portion on the tray 9 side, the wiring 17 inside the tray 9 (see FIG. 4 (1), FIG. 2 (2)), etc. Then, electric power is supplied to the heater 11 of the heater pad 10 of each tray 9, and the heater 11 is energized and generates heat.
In the figure, reference numeral 18 denotes a stopper. The stoppers 18 are respectively provided in a rib shape around the heater pad 10 of the tray 9, and the tableware 12 placed on the heater pad 10 moves the heating cart 1. , Regulate so that it does not shift, move, fall over, or fall during transportation.
[0013]
As the heater 11 of the tray 9, the resistance heater R shown in FIG. 4 (1) and FIG. 2 has been conventionally used. In addition to this, in the future, (2) in FIG. The use of the PTC heater S shown in the figure is also expected.
First, the resistance heater R is provided with a thermostat 19, and when the heat generation temperature reaches a predetermined temperature by energization, the energization is interrupted by the thermostat 19 and the heat generation temperature is controlled to the predetermined temperature.
In contrast, PTC (Positive Temperature)
The Coefficient) heater S is composed of a thermistor having a positive temperature characteristic made of an oxide semiconductor and does not use the thermostat 19. Then, when the heat generation temperature reaches a predetermined temperature due to energization, the resistance value is increased and the current value is changed to be low thereafter, so that the heat generation temperature is controlled to the predetermined temperature.
[0014]
Now, the heating cart 1 is used as shown in FIG. First, in step (1), for each tray 9 prepared, the tableware 12 containing the food 13 is placed on the heater pad 10 in step (2).
In step (3), the trays 9 on which the dishes 12 of the food 13 are placed in this way are accommodated in the heating cart 1 in multiple upper and lower stages, and cooking, Keep warm.
Then, in step (4), each tray 9 is taken out of the heating cart 1 that has been disconnected and moved and transported.
At that time, for each tray 9 taken out, beside the tableware 12 of the food 13 that has been cooked and kept warm, the tableware 21 of vegetables and other foods 20 as necessary, a knife, fork, chopsticks, napkin, etc. The tools etc. are put. In this way, the tray 9 on which the foods 13 and 20 for one meal are placed is used for serving to passengers in step (5).
The heating cart 1 is like this.
[0015]
<About Tray 9>
Next, the tray 9 will be described in detail with reference to FIGS. 1 and 2 (1), FIG. 3 (1), and (2). The tray 9 includes a tray main body 22 constituting the whole and a heater pad 10 partially arranged with respect to the tray main body 22.
Then, the heater pad 10 which is a heater heating portion disposed partially is in order from the top, the heating plate 23, the heater 11, the heat insulating material F, and the thermostat 19 (in the case where the heater 11 is made of the PTC heater S as described above). The thermostat 19 is not provided. The same applies hereinafter), the fuse H, the base frame 24, and the like.
[0016]
The tray 9 will be described in further detail. First, the tray body 22 constitutes the entire tray 9 and has a substantially flat plate shape, and is made of Ultem, Pes, Peak, or other resin.
The heating plate 23 of the heater pad 10 is made of aluminum or other light metal, has excellent thermal conductivity and thermal uniformity, has a size and width sufficient to cover the upper surface of the heater 11, and has an outer peripheral end 25. It is suspended in the shape of an inner flange.
The upper heat generating plate 23 and the lower base frame 24 allow the heater 11, glass wool and other heat insulating material F, thermostat 19, fuse H, wiring 17 and the like to be housed inside as a core material. , Sealed and densely covered on the outer periphery.
Since the planar heater 11 of the heater pad 10 has been described above, the description thereof is omitted. The heater 11 is connected to the connection terminal 16 attached to the side portion of the tray body 22 of the tray 9 or the like via the thermostat 19 and the fuse H via the wiring 17 (FIG. 4 (1) and (2). (See also figure).
[0017]
The base frame 24 of the heater pad 10 in the illustrated example has an integral structure with the tray body 22 and forms a part of the tray body 22. That is, the illustrated base frame 24 is made of the same resin as the tray main body 22 and is integrally injection-molded together with the tray main body 22.
The base frame 24 that is an integrally molded product with the tray main body 22 is fitted to the outer peripheral portion (in terms of shape and outer shape, the boundary with the tray main body 22 does not exist and is merely a conceptual outer peripheral portion). The groove portion 26 is erected integrally.
A lower portion of the outer peripheral end portion 25 where the heat generating plate 23 is suspended can be inserted from above into a circumferential groove 27 in which the upper surface of the circumferentially provided fitting groove portion 26 is opened.
[0018]
Then, as shown in FIGS. 3A and 3B, the outer peripheral end 25 of the heat generating plate 23 is fitted to the peripheral groove 27 of the fitting groove 26 of the base frame 24 in this way. At the same time, it is mounted and fixed by a locking structure formed by the locking protrusions 28 and the locking holes 29 and an adhesive structure formed by the adhesive sealing material N.
In the illustrated example, a locking hole 29 is provided in the outer peripheral end portion 25 on the heat generating plate 23 side, and a locking projection 28 is provided on the inner wall side of the fitting groove portion 26 on the base frame 24 side. Conversely, an example in which the locking projection 28 is provided on the outer peripheral end 25 side of the heat generating plate 23 and the locking hole 29 is provided on the fitting groove 26 side of the base frame 24 is also possible.
In any case, from the state shown in FIG. 3 (1), the outer peripheral end 25 of the heat generating plate 23 is fitted into the peripheral groove 27 of the fitting groove 26 of the base frame 24, and is temporarily elastic between each other. By following the step of deforming and returning to the original state, the outer peripheral end 25 is fitted into the circumferential groove 27 and the locking projection is inserted into the locking hole 29 as shown in FIG. 28 is engaged, so that a lock structure is realized.
The locking holes 29 and the locking projections 28 that form a pair are, for example, two places and a plurality of other positions on the outer peripheral end 25 side of the heat generating plate 23 and the fitting groove 26 side of the base frame 24 while forming a pair. Is provided.
[0019]
Further, the adhesive structure by the adhesive sealant N is as follows. First, as shown in FIG. 3 (1), the engagement between the outer peripheral end 25 of the heat generating plate 23 immediately before the outer peripheral end 25 is inserted into the peripheral groove 27 of the fitting groove 26 of the base frame 24 is performed. Adhesive sealing material (adhesive and sealing material) N is applied and adhered in the vicinity of the hole 29 and the locking projection 28. Furthermore, the adhesive sealant N is sufficiently applied and adhered to the periphery thereof, for example, in the circumferential groove 27.
Thereafter, as shown in FIG. 3 (2), the outer peripheral end 25 of the heat generating plate 23 is fitted and fitted into the peripheral groove 27 of the fitting groove 26 of the base frame 24. When the lock structure by the locking projections 28 is realized, the adhesive sealing material N adhered to the vicinity and the periphery thereof is in an interposed state.
Then, as time passes, the adhesive sealing material N interposed in this way is cured, thereby realizing an adhesive structure. With such an adhesive structure, a cured adhesive sealant is formed between the locking hole 29 and the locking projection 28, and between the lower portion of the outer peripheral end 25 of the heat generating plate 23 and the fitting groove 26 of the base frame 24. By N, it adheres firmly and densely.
[0020]
In FIG. 1 and FIG. 2 (1), 30 is a safety valve. The safety valve 30 is vertically attached to the base frame 24 and is composed of, for example, a check valve that operates at about 0.9 kg / cm ^2. The safety valve 30 is surrounded by the heat generating plate 23 and the base frame 24 and sealed. Intervening between the outside.
Then, in the case where water enters the inside of the tray 9, for example, when the tray 9 is washed, the water that has entered in this way evaporates inside by the subsequent heating of the heater 11. It is dangerous to increase the internal pressure. In such a case, the safety valve 30 functions to avoid the so-called steam explosion hazard and to release the internal pressure to the outside.
Considering that the tray 9 and the heating cart 1 are used in an aircraft, such a safety valve 30 is attached to the base frame 24 of the heater pad 10 of the tray 9 from the viewpoint of safety measures.
The tray 9 is like this.
[0021]
<About the action>
The present invention is configured as described above. Therefore, it becomes as follows. A large number of trays 9 are stored in the heating cart 1, and the food 13 in the tableware 12 placed thereon is cooked and kept warm (see FIGS. 4, 5, 6, etc.).
In the tray 9, the planar heater 11 partially arranged with respect to the tray main body 22 constituting the whole is covered with the upper heat generating plate 23 and the lower base frame 24. Further, the outer peripheral end portion 25 of the upper heat generating plate 23 is attached and fixed to the lower base frame 24.
[0022]
Then, as shown in FIGS. 3A and 3B, in the tray 9, the outer peripheral end 25 where the heat generating plate 23 is suspended is locked to the fitted base frame 24. The locking structure by the protrusion 28 and the locking hole 29 and the bonding structure by the adhesive sealing material N are used together and fixed.
Accordingly, when the tray 9 is manufactured, first, a lock structure is realized by fitting, so that the heat generating plate 23 is positioned, attached and fixed to the base frame 24. After that, the adhesive sealing material N applied and interposed is cured by leaving it as it is, and an adhesive structure is realized.
In this way, a dedicated process for curing the adhesive sealant N is not required, and accordingly, no equipment or space is required, and the assembling process is simplified and time is shortened.
[0023]
That is, in the tray A of this type of conventional example shown in FIG. 3 (3) described above, only an adhesive structure is employed, and a dedicated process for curing the adhesive sealant N is required.
That is, in this type of conventional tray A, since the lock structure was not used together, the heating plate D, the base frame K, and the entire tray A were kept until the applied and interposed adhesive sealant N was cured. It has to be fixed, and therefore, a device / apparatus / equipment for clamping / positioning is necessary, a place / space for curing is required, and a curing time has to be waited.
On the other hand, in the tray 9, since the lock structure and the adhesive structure are used in combination, the necessity for these is eliminated, and accordingly, equipment, space, assembly labor, time, and the like are reduced.
[0024]
Furthermore, the tray 9 is provided with a lock structure and an adhesive structure, so that the fixing and fixing strength of the heat generating plate 23 to the base frame 24 is improved.
That is, the locking structure formed by the locking projections 28 and the locking holes 29 is steadily reinforced by the bonding structure formed by the interposed and hardened adhesive sealing material N, and the center of the circumferential groove 27 formed by the bonding sealing material N. The adhesive structure is reinforced in a skeleton manner by the lock structure formed by the locking projections 28 and the locking holes 29.
In this way, the mounting and fixing strength between the light metal heat generating plate 23 and the resin base frame 24 is the same as the conventional example of this type shown in FIG. Compared to this, it is greatly improved.
Therefore, the base frame 24 and the tray main body 22 do not need to be particularly considered in terms of strength as in the conventional example of this type described above, and it is possible to use a relatively inexpensive resin.
[0025]
The present invention is characterized in that a lock structure and an adhesive structure are used in combination, unlike the conventional example of this type shown in FIG.
Therefore, the relationship between the base frame 24 of the heater pad 10 and the tray main body 22 may be made into an integral structure as in the example shown in FIGS. 1 and 2 (1). Regardless, as shown in the example shown in FIG. 2 (2), a separate structure may be used. The base frame K is separate from the tray main body B. May be attached and fixed to the tray main body B.
[0026]
【The invention's effect】
The tray for the heating cart of the present invention exhibits the following effects by attaching and fixing the heat generating plate of the heater to the base frame by using both the lock structure and the adhesive structure.
[0027]
Excellent in cost and strength. That is, in this tray, the heating plate of the heater is attached and fixed to the base frame using a lock structure and an adhesive structure. Therefore, in manufacturing, the heat generating plate is first positioned and attached and fixed to the base frame with a lock structure, eliminating the need for a dedicated process for fixing until the adhesive sealant is cured, which increases equipment costs. Therefore, space is not required, assembly processing is simplified and facilitated, and time is shortened.
That is, unlike the above-described conventional example in which only the adhesive structure is employed, the process of curing the adhesive sealant is not required, and the manufacturing cost can be reduced.
[0028]
Furthermore, the combined use of the lock structure and the adhesive structure improves the mounting and fixing strength as compared with the above-described conventional example having only the adhesive structure, and eliminates the anxiety that the heat generating plate peels off.
Therefore, it is possible to select and use a relatively inexpensive resin for the tray body and the base frame. It is not necessary to use an expensive resin such as Ultem to cover the insufficient adhesive strength as in the conventional example of this type described above, and it is possible to use, for example, a pess of about 1,300 yen / kg. Thus, the material cost is reduced, and cost reduction is realized from this aspect.
As described above, the effects exerted by the present invention are remarkably large, such as all the problems existing in this type of conventional example are solved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a tray for a heating cart according to the present invention, for explaining an embodiment of the invention.
FIGS. 2A and 2B are exploded explanatory views of the main part of the tray. FIG. 1A is used for explaining the embodiment of the present invention, and FIG. 2B is used for explaining this type of conventional example.
FIG. 3 is an enlarged vertical cross-sectional view of the main part of a tray. (1) FIG. 3 is used for explaining an embodiment of the present invention before mounting and fixing, and (2) is a diagram of the present invention after mounting and fixing. (3) FIG. 3 is used for explaining this type of conventional example after mounting and fixing.
4A is a plan view of an example of a tray, FIG. 4B is a plan view of another example of the tray, and FIG. 4B is a plan view of the main part of the heating cart. It is a front sectional view.
FIG. 5 is a process perspective view showing an example of a meal providing service using a tray.
FIG. 6 is a perspective view of a heating cart.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heating cart 2 Door 3 Caster 9 Tray 11 Heater 12 Tableware 13 Food 22 Tray main body 23 Heat generating plate 24 Base frame 25 Outer peripheral edge 28 Locking protrusion 29 Locking hole N Adhesive sealing material

Claims (1)

In a heating cart for service, which has a box shape, is equipped with doors and casters, is stored in multiple stages as shelves in which trays can be taken in and out, and the food in the dishes placed on the trays is cooked and kept warm,
The tray includes a tray body constituting the whole, a partially arranged planar heater, an upper heating plate that covers the heater from above and below, and a lower base frame. Become
The heat generating plate is fitted and fixed to the base frame at a suspended outer peripheral end, and is fixed by a lock structure using a locking protrusion and a locking hole, and an adhesive structure using an adhesive sealant. A tray for a heating cart.

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