JP3597653B2 - Blow molding method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a blow molding method capable of easily and reliably integrating a functional member, which can be a heating element, into a seat portion or a back portion of a chair under excellent watertightness.
[0002]
[Prior art]
In the air conditioning of theaters, halls, sports facilities and other large spaces, especially for heating, the inefficiency of heating when blowing warm air from floors and walls is eliminated, 2. Description of the Related Art As a conventional technique for heating a chair installed in an audience seat or the like and a peripheral portion thereof, for example, there are air conditioning structures disclosed in JP-A-6-200645 and JP-A-8-205963.
[0003]
Here, in the former air-conditioning structure, an air-conditioning duct is a horizontally extending hollow portion surrounded by a cross section of a stair-shaped audience seat and a riser, and this air-conditioning duct is used as a seat of a chair in front of the cross section. In addition to connecting to the back hollow part, the upper part of the seat back is provided with an air outlet for blowing air conditioning air toward the person in the rear seat, and the latter air conditioning structure has a hollow inside. In the seat part, a hot air intake and a hot air outlet are provided, and the warm air entering from the hot air intake passes through the inside of the seat part and blows out from the hot air outlet to the lower part of the seat part. is there.
[0004]
[Problems to be solved by the invention]
However, in such a conventional technique, it is necessary to provide an air-conditioning duct or the like over the entire audience seats, and it is necessary to connect the air-conditioning duct or the like and the chair sufficiently airtightly. As the number of working steps increases, and a large-capacity blower is indispensable in addition to a large amount of hot air generators, running costs also increase in addition to further increase in equipment costs. Furthermore, there is a problem that the thermal efficiency is low because the chair is secondarily heated by the warm air generated once.
In addition, when such a conventional technique is applied to a chair installed in an audience seat or the like of an outdoor facility, infiltration of rainwater or the like from a hot air outlet is inevitable, and sufficient heat insulation treatment for air conditioning ducts and the like is performed. There was another problem that was required.
[0005]
Therefore, for the purpose of reducing equipment costs, running costs, and the like, it has been proposed to directly heat the chair with a heating element embedded in the chair, but according to this, the heating element is disposed on the chair. In addition to the need for additional man-hours, there is a problem that it is extremely difficult to secure sufficient watertightness against rain, snow, frost and the like when the chair is installed in an outdoor facility.
[0006]
The present invention has been made as a result of studying to solve all of these problems as a problem.The purpose of the invention is to eliminate large-scale facilities for heating, piping, and the like, An object of the present invention is to provide a simple and reliable blow molding method for a heating chair which can greatly reduce running costs and exhibit sufficient water tightness when applied outdoors.
[0007]
[Means for Solving the Problems]
In the blow molding method of the present invention, when blow molding a seat or comb back portion of a chair, a protective plate made of a synthetic resin material and a functional member bonded thereto are attached to one of a pair of molds. Molding is performed in the state of being stored and held, and at least the peripheral portion of the protective plate is fused to the surface side of the seat portion or the backrest portion to seal the functional member inside the protective plate.
[0008]
In this blow molding method, a protection plate and a functional member that can be a heating element bonded thereto are housed in one mold, and are held there by, for example, negative pressure suction. By simply performing injection blow molding, extrusion blow molding, etc., the heating element can be easily and securely sealed inside the protective plate without special man-hours for embedding the heating element in the chair. It is possible to heat the seat or back of the chair appropriately by simply connecting the lead wire derived from the heating element to the power supply, so that not only large facilities, but also pipes throughout the audience seats, Work such as laying and connection is unnecessary, and the chair can be effectively warmed with high thermal efficiency and low running cost.
[0009]
Moreover, in this method, at least the peripheral portion of the protective plate is reliably and firmly fused to the surface side of the seat portion or the back portion and exhibits excellent watertightness, so that when the chair is installed outdoors. Even so, the heating element can be sufficiently protected against rain, snow, frost and the like.
[0010]
In addition, here, the functional member may be a heat generating element itself, as described above, or a heat generating element, a controller thereof, and a heat insulating layer positioned corresponding to the controller, which are connected to each other. According to this, during the molding after clamping, the controller can be effectively prevented from being damaged due to the direct or indirect contact of the high-temperature molding material with the controller with the heat insulating function of the heat insulating layer. Can be.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic perspective view of an essential part showing one embodiment of the present invention in the case where a heating element as a functional member is hermetically mounted on the front side of a seat of a chair as a blow molded product.
In the figure, reference numeral 1 denotes an extrusion die, 2 denotes an inner cylindrical parison formed by extrusion with the extrusion die 1, and 3a and 3b are disposed below the extrusion die 1 to define a required molding cavity. 3 shows a pair of molds to be defined.
[0012]
In this case, the relative displacement in the further lower part of the molds 3a, 3b, just below the cylindrical parison 2, is guided by the long holes 4a, 4b provided in the guide plate 4 to approach and separate from each other. It is possible to arrange a pair of extension pins 5a and 5b, and at the position where both extension pins 5a and 5b are close to each other, the diameter of a circumscribed circle to the pins 5a and 5b is smaller than the inner diameter of the cylindrical parison 2. On the other hand, at the position where the two pins 5a and 5b are separated from each other, the diameter of a circle circumscribed to the two pins 5a and 5b is made much larger than the inner diameter of the parison 2.
6a and 6b denote a pair of pinch plates disposed somewhat above the guide plate 4 with the extension pins 5a and 5b interposed therebetween.
[0013]
When the seat is blow-molded by an apparatus having such a configuration, prior to the start of the molding, one of the paired molds 3a and 3b, usually contributes to the molding of the front side of the seat. The synthetic resin protective plate 8 and the heating element 9 joined to each other are housed in the molding recess 7 of the mold 3a to be molded, and the joined body is placed at a predetermined position on the molding surface by, for example, negative pressure suction. Hold the positioning.
[0014]
Here, as shown in the bottom perspective view of FIG. 2, this bonded body is provided with a required planar shape and dimensions on a central portion of a protection plate 8 previously formed in a square dish shape by blow molding, injection molding, vacuum molding or the like. , For example, a heater panel is bonded in advance using an adhesive or the like, and the bonded body is suction-held on the molding surface of the mold 3a with its bottom side facing inward. You.
[0015]
After such a preparation, the cylindrical parison 2 is extruded by the extrusion die 1 and the lower end thereof is gradually displaced downward, so that the pair of extension pins 5a and 5b which are brought into the mutually close posture are connected to the cylindrical parison 2. When the parison 2 is sufficiently close to the guide plate 4, the extrusion of the parison 2 is temporarily stopped.
[0016]
Next, the extension pins 5a and 5b are displaced from each other along the long holes 4a and 4b, whereby the cylindrical parison 2 has a required flat cylindrical shape as shown in FIG. Then, the pair of pinch plates 6a and 6b are advanced and displaced to sandwich the widened parison 2a, and the front side portion and the rear side portion are mutually fused on the inner surface of the lower end portion of the widened parison 2a. To wear. Here, since both pinch plates 6a and 6b have notches at the positions corresponding to the respective extension pins 5a and 5b, the widened parison 2a except at the positions corresponding to the pins 5a and 5b. The respective portions on the front surface side and the back surface side are directly fused to each other.
[0017]
Further, by blowing a small amount of air into the widened parison 2a from an appropriate position thereof, the parison 2a is pre-blown, and as shown in FIG. Thereafter, the pair of molds 3a and 3b are clamped, and air is also blown into the parison portion sandwiched between the molds 3a and 3b from an appropriate position. More precisely, by closely adhering to the inner surface of the mold and the inner surface of the joint between the protective plate 8 and the heating element 9, the inner surface is molded into a shape that exactly follows the inner surface and the joint is protected. A series of blow molding of the chair seat is achieved by heat-sealing at least the peripheral portion of the plate 8 to a portion corresponding to the front side of the seat, and then cooling and curing the formed portion. To end the work.
[0018]
In performing such a mold clamping and forming process, it is necessary to extract the extension pins 5a and 5b from the molded product afterwards and reuse them, and therefore, these extension pins 5a and 5b are used. When the molds 3a, 3b are clamped under the state where the molds 3a, 3b are most separated from each other, both pins 5a, 5b are positioned outside the molds 3a, 3b in the width direction.
[0019]
After the blow molding of the seats is completed as described above, the molds 3a and 3b are opened, and each of the extension pins 5a and 5b is extracted from the molding seats in a required order. By doing so, the seat as a molded product is taken out.
[0020]
FIG. 5 is a longitudinal sectional view showing the seat portion 11 blow-molded in this manner. In this seat portion 11, a dish-shaped protective plate 8 Is tightly and firmly fused around the periphery thereof, and the heating element 9 is hermetically sealed by the protective plate 8. Therefore, the number of working steps for disposing the heating element on the seat afterward is reduced. It can be completely unnecessary, and the fused portion of the protective plate 8 can ensure excellent watertightness.
[0021]
By the way, as shown in an exploded perspective view from the bottom side in FIG. 6, the functional member to be joined to the protection plate 8 is provided with the heating element 9, the controller 21 sequentially laminated thereon, and the position corresponding to the controller 21. According to this, overheating of the controller 21 at the time of heat fusion of the protection plate 8 can be sufficiently prevented by the heat insulating layer 22, and the controller 21 can always be properly controlled. Can work. Accordingly, in this case, the number of man-hours for separately arranging the controller 21 of the heating element 9 outside the chair can be eliminated.
[0022]
Here, the controller can be disposed between the protective plate 8 and the heating element 9. In this case, the controller 21 can be moved away from the heating source thereof, Since the tight joining to the protection plate 8 over the entire surface is hindered by the controller 21, the heat transfer efficiency from the heating element 9 to the protection plate 8 must be reduced.
[0023]
【The invention's effect】
Thus, according to the present invention, by storing and holding the joined body of the protective plate and the functional member in the molding die in advance, the functional member is sealed with high watertightness, and the seat or backrest of the chair is sealed. The part can be easily manufactured with excellent reliability.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an essential part showing an embodiment of the present invention.
FIG. 2 is a bottom perspective view illustrating a bonding state between a protective plate and a functional member.
FIG. 3 is a perspective view of an essential part showing a state in which a cylindrical parison is widened and deformed.
FIG. 4 is a perspective view of a main part showing a pre-blow state.
FIG. 5 is a longitudinal sectional view showing a seat as a blow molded product.
FIG. 6 is an exploded perspective view from the bottom side showing another form of the functional member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Extrusion die 2 Cylindrical parison 2a Widening parison 3a, 3b Die 4 Guide plate 4a, 4b Elongated hole 5a, 5b Extension pin 6a, 6b Pinch plate 7 Molding recess 8 Protective plate 9 Heating element 11 Seat 21 Controller 22 Heat insulation layer

Claims (3)

In blow molding the seat or back of the chair,
In either one of the pair of molds, the protective plate and the functional member bonded thereto are molded and held in a housed state, and at least the peripheral portion of the protective plate is placed on the front side of the seat or the backrest. A blow molding method, wherein the functional member is sealed inside the protective plate by fusing. The blow molding method according to claim 1, wherein the functional member is a heating element. 2. The blow molding method according to claim 1, wherein the functional portion member is constituted by a heat generating element, a controller thereof, and a heat insulating layer positioned corresponding to the controller, which are joined to each other.

Images