JP2015226632A - Air distribution duct for seat pad, seat pad including air distribution duct, and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air distribution duct for seat pads, seat pad including the air distribution duct, and manufacturing method therefor contributing to improvement in quality stability and yield by reducing workload and preventing floating of a duct tip end in setting the air distribution duct in a foaming mold.SOLUTION: A synthetic-resin air distribution duct 2 for seat pads includes a duct 21 extending from a base part 26 that includes an air introduction inlet 26e in a back side 2b, and air exhaust outlets 25a provided on he duct 21 in a surface 2a side. The air distribution duct includes through-holes 21c at a back-side pipe wall 21f of the duct 21 facing the air exhaust holes 25a.

Description

  The present invention relates to an air distribution duct for a seat pad that constitutes a vehicle seat, a seat pad with an air distribution duct, and a method for manufacturing the same.

  There are seat cushions and seat backs that constitute a seat portion and a backrest of a seat seat mounted on a vehicle such as an automobile. The seat cushion and the seat pad of the seat back are the parts that come into contact when the occupant sits down, and the occupant sweats in the hot season, but may feel cold in the winter season. For this reason, Japanese Patent Application Laid-Open No. 2005-95343 and the like propose an invention in which a seat pad is integrally foamed by inserting a duct for air distribution. Furthermore, an improved invention has been proposed that solves the problem of foaming raw materials entering the duct from the air inlet and air outlet of the air distribution duct during foam molding of the seat pad (for example, Patent Document 1).

JP 2012-105816 A

  Patent Document 1 describes, as described in claim 1, “... a mold surface, a hemispherical protrusion is provided at a portion corresponding to the air inlet or the air outlet, and the mold is closed by both split molds. The projection enters into the air inlet or the air outlet related to the duct set inside, and the air inlet or the air outlet is closed. "

  However, as shown in FIG. 2, the pipes constituting the recent air distribution ducts tend to be flattened because the cylinder outer diameter d is longer in the cylinder width direction d2 which is the vehicle width direction than the front and rear direction length d1. Therefore, warping has occurred at the tip of the duct extending in all directions, and a problem has arisen in that it floats from the mold surface when set to a foaming mold. In particular, since the pad thickness of the back pad is thin, when the air distribution duct is arranged on the back surface side and further flattening is promoted so as not to give a sense of incongruity with the air distribution duct, the floating becomes remarkable. The air outlet near the tip far from the base of the air inlet lifted from the mold surface, which hindered the injection of foaming raw materials. Proceeding to the mold closing step, the protrusion described in Patent Document 1 may enter the air outlet and close it. However, under the condition that the tip of the conduit is warped and lifted from the mold surface, the mold is closed from the injection of the foaming raw material. During the working process, there has been a problem that the foaming raw material enters the conduit from the air outlet around the tip.

  The present invention solves the above-mentioned problems, and is a seat pad arrangement that can reduce the work burden and prevent the rise of the end of the conduit by using a set of air distribution ducts in a foam mold, contributing to stable quality and improved yield. An object of the present invention is to provide a wind duct, a seat pad with a distribution duct, and a method of manufacturing the same.

In order to achieve the above object, the gist of the invention described in claim 1 is that the conduit (21) extends from the base (26) where the air inlet (26e) is on the back surface (2b) side, and the surface ( 2a) is a synthetic resin seat pad air distribution duct (2) in which an air outlet (25a) is provided in the conduit (21) on the side, the conduit (21) facing the air outlet (25a) ) Is provided with a through-hole (21c) on the back-side tube wall (21f). According to a second aspect of the present invention, there is provided a seat pad air distribution duct according to the first aspect, wherein the conduit (21) branches from the base (26) in four directions so that the conduit (21) is substantially coplanar and extends in the four directions. The front end (211) is provided with the through hole (21c).
The gist of the invention described in claim 3 is that a conduit (21) extends from a base (26) having an air inlet (26e) on the back surface (2b) side, and the conduit (21a) on the surface (2a) side ( 21) a synthetic resin air distribution duct (2) provided with an air outlet (25a) and a seat pad (1) integrated by insert molding the air distribution duct (2). A seat pad with a wind duct, and a through hole (21c) formed through the back side pipe wall (21f) of the conduit (21) facing the air outlet (25a), and the through hole (21c) And a backing material (3) covering the seat pad back surface (1b) including the back side tube wall (21f) around the through hole (21c). According to a fourth aspect of the present invention, there is provided a seat pad with an air distribution duct according to the fourth aspect of the present invention, wherein the conduit (21) branches from the base portion (26) in four directions so that the conduit (21) is substantially coplanar and extends in the four directions. The front end (211) is provided with the through hole (21c).
The gist of the invention described in claim 5 is that a conduit (21) extends from a base (26) having an air inlet (26e) on the back surface (2b) side, and the conduit (21a) on the surface (2a) side ( A synthetic resin air distribution duct (2) provided with an air outlet (25a) at 21) is set in the foaming mold (6), and then the foaming raw material (g) is injected and the mold is closed. The seat pad (1) in which the air duct (2) is embedded is foam-molded, and the air outlets (25a) are aligned with the plurality of air outlets (10) foam-molded on the seat pad surface (1a). And a method of manufacturing a seat pad with an air distribution duct in which the air inlet (26e) is exposed on the back surface (1b) side of the seat pad (1), the conduit facing the air outlet (25a) One split mold (61) for forming the seat pad surface (1a) side while providing a through hole (21c) on the back side tube wall (21f) of (21) and making the foam mold (6) a split mold Corresponding to the through hole (21c) of the air distribution duct (2) to be set A pin member (64) having a diameter of the head (641) larger than the hole diameter of the through hole (21c) is erected at a portion where the rear surface side wall (21f) around the through hole (21c) is provided. After allowing the head (641) of the pin member (64) to pass through the through-hole (21c), the head (641) is locked to the back-side tube wall (21f). The air distribution duct (2) is set in one split mold (61), while the other split mold (62) is set with the backing material (3), then the mold is closed and the backing material ( 3) Cover the through-hole (21c) with a foam pad of the seat pad (1), and then close the through-hole (21c) so as to close the through-hole (21c) and the sheet on the back side pipe wall (21f). In the method of manufacturing a seat pad with an air distribution duct, the back surface (1b) is covered with a backing material (3).

  The air distribution duct for seat pads of the present invention, the seat pad with the air distribution duct, and the manufacturing method thereof can easily seal the air outlet by setting the air distribution duct to the foaming mold, and the air distribution duct is embedded and integrated. In the foam molding process of the seat pad, there is no intrusion of foaming material from the air outlet, and it is possible to achieve quality stability, yield improvement, etc.

It is the perspective view seen from the surface side of the air distribution duct by one form of the air distribution duct for seat pads which concerns on this invention, the seat pad with an air distribution duct, and its manufacturing method. It is the II-II arrow directional view of FIG. It is a surface side perspective view of a seat pad with an air distribution duct incorporating an air distribution duct. It is a back surface side perspective view of a seat pad with an air distribution duct incorporating an air distribution duct. FIG. 5 is a view taken in the direction of arrows V-V in FIG. 4. It is explanatory drawing sectional drawing of the foaming type | mold which has inject | poured the foaming raw material in the mold open state after setting of the air distribution duct. It is explanatory sectional drawing which shows a mode that the mold was closed after foaming raw material injection | pouring of FIG. FIG. 8 is an explanatory cross-sectional view illustrating a state in which foam molding is performed following FIG. 7. It is a principal part enlarged view around the conduit | pipe front-end | tip part of FIG. It is a principal part enlarged view around the conduit | pipe front-end | tip part of FIG. FIG. 9 is an enlarged view of a main part around the distal end portion of the duct with the air distribution duct after being removed from the state of FIG. 8.

Hereinafter, the air distribution duct for seat pads according to the present invention, the seat pad with the air distribution duct, and the manufacturing method thereof will be described in detail.
The seat pad air distribution duct, the seat pad with the air distribution duct, and the manufacturing method thereof are applied to a back pad that constitutes a backrest of an occupant. FIG. 1 to FIG. 11 show an embodiment of a seat pad air distribution duct, a seat pad with an air distribution duct and a method of manufacturing the same according to the present invention, FIG. 1 is a perspective view as seen from the surface side of the air distribution duct, and FIG. Fig. 3 is a front perspective view of a seat pad with an air distribution duct incorporating the air distribution duct shown in Fig. 1, Fig. 5 is a perspective view of the rear surface, and Fig. 5 is a VV line of Fig. 4. FIG. 6 is an explanatory cross-sectional view of the foaming mold in which the foaming raw material is injected in the mold open state after setting the air distribution duct, and FIG. 7 is an explanatory cross-sectional view showing the state of the mold closing after the foaming raw material injection in FIG. FIG. 8, FIG. 8 is an explanatory sectional view showing the state of foam molding following FIG. 7, FIG. 9 is an enlarged view of the main part around the conduit tip of FIG. 6, and FIG. 10 is an enlarged view of the main part around the conduit tip of FIG. FIG. 11 and FIG. 11 are enlarged views of the main part around the distal end portion of the duct with the air distribution duct after demolding. In order to make the drawing easy to understand, FIG. 5 is a sectional view passing through each air outlet 10 and the air outlet 25a.

(1) Seatpad air distribution duct The seatpad air distribution duct 2 has a duct 21 extending from a base 26 where an air inlet 26e is present on the back surface 2b side, and an air outlet 25a on the surface 2a side. Is a synthetic resin pipe member. The air distribution duct 2 for the back pad is provided in which the conduit 21 extends from the base portion 26 and a plurality of air jets 25a including the location of the conduit 21 are provided on the surface 2a side. The “front side” of the present invention refers to the side of the surface that comes into contact when the occupant sits on the seat, and is the left side of the page in FIG.
When the back pad 1A with duct is completed, each air outlet 25a conducts to the plurality of air outlets 10 formed on the front surface side, while the front end opening is an air inlet 26e from substantially the center of the back pad back surface 1b. The air introduction part 261 which becomes becomes exposed. The air distribution duct 2 is arranged near the back pad back surface 1b, and an air introduction portion 261 is formed on the back surface side of the base portion 26 located substantially at the center of the air distribution duct 2, and the air introduction portion 261 is connected to the mating member. Is done.

As shown in FIG. 2, the air distribution duct 2 here is a flat tube in which the cylinder outer diameter d of the conduit 21 is longer in the cylinder width direction length d2 than the front and back direction length d1, and is blown. This is a synthetic resin tubular member made of polypropylene resin or the like in which the conduit 21 and the base portion 26 are integrally formed by molding. In FIG. 1, the conduit 21 of the horizontal cylindrical portion 23 extends in the vehicle width direction through the guide portion 22 connected to the base portion 26, and the conduits 21 of the pair of vertical cylindrical portions 24 extend above the plane of the drawing (above the back pad). On the other hand, the conduit 21 of the pair of vertical cylinder portions 24 extends from the guide portion 22 so as to spread obliquely downward (back pad diagonally downward) on the paper surface. “Back pad upper” means the upper surface of the back pad 1A in the normal state of FIG. 5 in which the back pad 1A is mounted on the vehicle, and the occupant can sit back. A blow-molded duct is provided with a conduit 21 extending in four directions in a substantially X shape in plan view from a hollow box-like base portion 26 disposed substantially at the center.
The bag portion 28 that closes the tip end 210 made of blow molding at the tip portion 211 of each of the four branched conduits 21 is left as it is. An air outlet 25a, which is adapted to the air outlet 10 of the back pad 1A and blows out comfortable air to a seated occupant, is located at a conduit tip 211 extending in four directions in a substantially X shape in plan view as shown in FIG. In addition, four guides 22 are provided in the middle of the conduit 21 leading to the four. Then, through four air outlets 25a in the tip portion 211 extending in four directions in a substantially X shape, through holes 21c are formed through the rear-side tube wall 21f of the conduit 21 facing the air outlets. (Figure 2).

Specifically, as shown in FIGS. 1 to 8, the conduit 21 branches and extends in four directions so as to be substantially on the same plane from the base portion 26 where the air inlet 26e is present. The tips of the four conduits 21 are kept closed by the bag portion 28 formed by blow molding, and an air outlet 25a is provided on the surface 2a side of the conduit tip portion 211 around the bag portion 28. And through-holes 21c are provided in the rear-surface-side tube wall 21f facing the air outlet 25a at the tip portions 211 of the four conduits 21 that are distant from the base 26 in four directions. The hole diameter of the through hole 21c is made smaller than the diameter of the air outlet 25a. As shown in FIG. 2, a circular through hole 21 c is provided in the rear surface side pipe wall 21 f facing the circular air outlet 25 a at the conduit tip portion 211. The central axis passing through both circular centers is made to be substantially perpendicular to the flat surface of the back-side tube wall 21f. By providing the through-hole 21c penetrating the back-side tube wall 21f, it is possible to easily prevent the foaming raw material from entering the conduit 21 from the air outlet 25a during foaming of the back pad (details will be described later).
Although not shown, the air introduction part 261 that forms the air introduction port 26e as in Patent Document 1 may be a short cylindrical part, and the flange 27 may be provided here.

(2) Seat pad with air distribution duct The seat pad with air distribution duct includes the air distribution duct 2, the seat pad 1 that is integrated by insert molding, and the backing material that is disposed on the seat pad back surface 1b. 3 (FIGS. 3 to 5). A synthetic resin air distribution duct 2 in which a conduit 21 extends from a base portion 26 having an air inlet 26e on the back surface 2b side, and an air outlet 25a is provided in the conduit 21 on the front surface 2a side, and the air distribution duct And back pad 1A which is integrated by insert molding.

The air distribution duct 2 is the same as the air distribution duct (1) in which a through-hole 21c as shown in FIG. 9 is provided in the rear surface side wall 21f of the conduit 21 facing the air outlet 25a. Omit.
The seat pad 1 is formed by foam molding so that the air blowing port 10 that matches the air blowing port 25a is provided on the surface 1a at a certain depth (FIGS. 3 and 5), and the air distribution duct 2 is insert-molded. Integrated foam. The air outlet 10 is larger than the diameter of the air outlet 25a. In the foam molding of the seat pad, the air distribution duct 2 is embedded and integrated near the back surface 1b of the seat pad 1 as shown in FIG. The reason why the air distribution duct 2 is disposed closer to the back surface of the seat pad 1 is to obtain a cushioning property and comfort by the seat pad 1 by setting the distance from the seat pad surface 1a to the air distribution duct 2 as large as possible. .

  The seat pad 1 of the present embodiment is a back pad-shaped foam that forms the backrest of the seat, and its thickness t is thinner than that of the seat cushion (FIGS. 3 to 5). Therefore, the air distribution duct 2 is used which is a flat tube having a cylinder outer diameter d of the conduit 21 as shown in FIG. 2 that is longer in the cylinder width direction length d2 than the front and back direction length d1. Even if the back pad thickness t is small, desired cushioning and comfort can be obtained. By connecting a tubular mating member into which comfortable air is sent into the pipe from the air conditioner on the air introduction port 26e side, the comfortable air passes through the flow path u in the base 26, the guide 22 and the conduit 21, and the air jet It is the back pad 1A with the air distribution duct 2 that passes through the outlet 25a and is distributed from each air outlet 10 to the occupant.

The backing material 3 is a sheet-like fabric material made of a nonwoven fabric or the like that matches the size of the back pad back surface 1b. The portion of the air introduction portion 261 exposed on the back side is cut out to form a cutout opening 30 (FIG. 4). The foaming of the back pad 1A covers the backing material 3 on the back pad back surface 1b together with the back side tube wall 21f related to the conduit 21 around the through hole 21c so as to close the through hole 21c (FIG. 11). ). In the foam molding of the back pad 1, the air distribution duct 2 is set in the lower mold as the split mold 61 that forms the back pad surface 1a side (details will be described later). The through hole 21c is provided so as not to enter the inside 21. In the back pad foam molding, a through hole 190 formed by the head portion 641 of the pin member 64 is formed between the backing material 3 and the back surface 2b of the back-side tube wall 21f around the through hole 21c.
As in the manufacturing method of the seat pad with the air distribution duct 2 described below, the back pad 1A is foamed and the backing material 3 is set on the mold surface 630 corresponding to the back surface 1b, and the air distribution duct 2 is covered and backed. The backing material 3 is integrally adhered to the pad back surface 1b. In the figure, reference numeral 11 denotes a main part, reference numeral 12 denotes a main part, reference numeral 13 denotes a side part, reference numeral 14 denotes a hanging groove, reference numeral 14a denotes a longitudinal groove, and reference numeral 14b denotes a lateral groove.

(3) Manufacturing Method of Seat Pad with Air Distribution Duct Before manufacturing the seat pad 1 (back pad 1A), the air distribution duct 2 and the backing material 3 are prepared. The air distribution duct 2 and the backing material 3 are the same as those described in (1) and (2) and will not be described in detail.

The foaming mold 6 used for manufacturing the back pad 1A with the air distribution duct 2 is a split mold as shown in FIGS. 6 and 7, and includes a lower mold 61, an upper mold 62, and a middle mold 63. When the mold is closed as shown in FIGS. 6 to 7 with the hinge 69 as a fulcrum, the mold surface 610 of the lower mold 61 (one divided type) and the mold surface of the middle mold 63 (other divided mold) having a large degree of depression as a whole. The cavity 630 of the back pad 1A in which the air distribution duct 2 and the backing material 3 are integrated with the pad main body 11 is formed by the die surface 620 of the upper die 62 and 630.
The lower mold 61 is provided with a raised portion 611 for forming the air outlet 10 by raising each part of the mold surface 610 in a columnar shape. The air distribution duct 2 may be set in the foaming mold by simply hitting the air outlet 25a on the upper surface 611b of the raised portion. Here, a projection 611a is provided on the upper surface 611b of each raised portion, and the projection 611a enters the air outlet 25a and closes the mouth of the air outlet 25a by setting the air distribution duct 2 to the raised portion 611. I am doing so. A hemispherical protrusion 611a that is larger than the diameter of the air outlet 25a can be provided on the upper surface 611b of the raised portion. This is because the ball band of the protrusion 611a whose diameter is larger than the diameter of the air outlet 25a is brought into contact with the inner peripheral edge of the air outlet 25a by sealing the mold, thereby sealing the air outlet 25a.

  Then, the surface 1a side of the back pad 1A is molded with the mold surface 610 of the lower mold 61, and the back surface 1b side of the back pad 1A is molded with the mold surface 630 of the middle mold 63. A metal pin member is formed on the raised portion 611. 64 is erected. A protrusion 611a on the lower raised portion 611 that is one split mold 61 that forms the back pad surface 1a side, and a portion corresponding to the through hole 21c of the air distribution duct 2 to be set is provided in the through hole 21c. A pin member 64 having a head 641 whose diameter is larger than the hole diameter is erected. The maximum cross-sectional diameter of the head 641 is made larger than the hole diameter of the through hole 21c. However, in the set of the air distribution duct 2 to the lower mold 61, the back side pipe wall 21f around the through hole 21c hits the protruding head portion 641, but if a force is applied from above to the vicinity of the pipe tip 211, the through hole 21c The head 641 passes through the through hole 21c due to the flexible deformation of the surrounding synthetic resin, and the head 641 is locked to the back surface 2b of the back surface side tube wall 21f around the through hole 21c. Can be set on the lower die 61.

  Using the foaming mold 6, the air distribution duct 2, and the backing material 3, the back pad 1A with the air distribution duct 2 is manufactured as follows, for example. A seal tape 4 is attached and sealed in advance to the air inlet 26e of the air distribution duct 2.

First, the foaming mold 6 is opened (FIG. 6). Under this mold open state, the air distribution duct 2 is set in the lower mold 61 which is one split mold. In line with the setting of the air distribution duct 2, the backing material 3 is set on the other intermediate mold 63 (setting step of the air distribution duct and the backing material).
In the set of the air distribution duct 2 to the lower mold 61, the protrusion 611a and the pin member 64 are inserted into the air outlet 25a and the air distribution duct 2 is placed on the raised portion 611. If the air distribution duct 2 is simply set, the head portion 641 hits the back side tube wall 21f around the through hole 21c. However, by pressing the back-side tube wall 21f from above, the head 641 penetrates the through hole 21c due to the flexibility of the synthetic resin forming the air distribution duct 2, and the air distribution duct 2 is attached to the lower mold 61. Positioning can be set.
The duct 21 of the air distribution duct 2 has a cross-sectional shape as shown in FIG. 2, and the outer diameter d of the tube is flatter than the length d1 in the cylinder width direction which is the vehicle width direction than the length d1 in the front and back direction. As a tube, it extends in all directions as shown in FIG. For this reason, the conduit tip 211 region extending to the four-side tip tends to warp in the direction perpendicular to the paper surface of FIG. In the set of the air distribution duct 2 to the lower mold 61, as shown by the chain lines in FIGS. 6 and 9, the conduit tip 211 and the air outlet 25a are lifted from the upper surface 611b (and / or the protrusion 611a) of the raised portion 611. The trouble which leaves is caused. Even if the protrusion 611a for closing the mouth of the air jet outlet 25a is provided, the protrusion 611a is not useful unless it proceeds to the mold closing process. In the mere setting set of the air distribution duct 2, there is a problem that the foaming raw material g enters from the air outlet 25 a before the mold is closed.

  This manufacturing method solves such a problem by providing the through hole 21c and the pin member 64. The rear-side tube wall 21f around the through-hole 21c colliding with the head 641 gets over by being deformed by the flexibility of the synthetic resin. The head 641 of the pin member 64 that has been overcome is locked to the back side of the back side wall 21f, and the air distribution duct 2 is set on the lower mold 61. Thus, even if the air distribution duct 2 is bent and the air outlet 25a is raised from the protrusion 611a, the air outlet 25a can be closed. Although the back surface side tube wall 21f around the through hole 21c collides with the head portion 641, the back surface side tube wall 21f is pressed to pass through the flexible deformation of the synthetic resin. The head 641 reaches the back surface 2b of the back-side tube wall 21f around the through hole 21c, and the air distribution duct 2 is securely set and fixed to the foaming mold 6. The head portion 641 is locked and fixed to the back surface of the back-side tube wall 21f that has passed through (through) the through-hole 21c, and this head portion 641 is now configured to press the back-side tube wall 21f from the back surface side. The conduit portion at the periphery of the air outlet 25a that initially floated away from the raised portion and the protruding portion 611a is in close contact with the raised portion 611 and the protruding portion 611a. Since the back-side tube wall 21f around the through-hole 21c in the four distal end portions 211 extending in a tubular shape in the four directions of the conduit 21 is locked and fixed by the head portion 641, before setting, FIG. Even in the case of the air distribution duct 2 that has been bowed as shown in the chain line, the air duct 2 is corrected to substantially the same horizontal plane and the mouth of the air outlet 25a is closed. Before the mold closing is completed, the problem that the foaming raw material g enters the conduit 21 from the air outlet 25a is eliminated.

Here, the through hole 21c and the pin member 64 may be provided only at one of the four-way conduit tip portions 211, but the tip portions 211 at the four-way ends of the conduit 21 related to the air distribution duct 2 as shown in FIGS. It is more preferable to provide it at all four locations. This is because the correction of the entire air distribution duct 2 warped in an arc shape can be carried out smoothly, and the periphery of the air outlet 25a can be tightly adhered to the protrusion 611a and the raised portion upper surface 611b and sealed.
The pin member 64 is a daruma pin as shown in FIG. 10, and the tip portion of the shaft portion 642 loosely inserted into the hole passing through the protrusion 611 a is screwed to the protrusion 611, and the protrusion on the protrusion 611 of the lower mold 61 is projected. It stands on the part 611a. The tip of the head 641 is rounded so that it can easily go through the through hole 21c. Although illustration is omitted, in order to make it easier for the head portion 641 to pass through the through hole 21c, a radial cut is made from the periphery of the through hole 21c to the main body of the rear surface side wall 21f, or the back surface of the periphery of the through hole 21c. It is more preferable to reduce the thickness of the side tube wall 21f.

Next, with the mold open, the foam raw material g such as a back pad molding urethane foam stock solution is applied to the mold surface 610 forming the cavity C of the lower mold 61 using an injection nozzle NL as shown in FIG. A predetermined amount is injected (foaming raw material injection step).
Subsequently, as shown in FIG. 7, the upper mold 62 is operated to close the mold (mold closing process). By closing the upper mold 62, the lower mold 61, and the middle mold 63, the back pad cavity C in which the air distribution duct 2 is inserted and set is formed. By closing the mold, the backing material 3 covers the through hole 21c as shown in FIG.

After closing the mold, the process proceeds to foam molding of the back pad 1A (foam molding process). The mold closed state of FIG. 7 is maintained for a predetermined time, and the air distribution duct 2 is embedded and integrated as shown in FIGS. 8 and 11, and the back pad wall 21f around the through hole 21c is closed and the seat pad is closed. A back pad 1A on which the backing material 3 is deposited and integrated is formed on the back surface 1b by foam molding.
Here, as the conduit 21 is flattened as shown in FIG. 2, the air distribution duct 2 itself is more likely to be warped or deformed. Even if the air distribution duct 2 is set on the lower mold 61, the degree of the air distribution duct 2 rising from the raised portion 611 increases. There may be a case where the air ejection port 25a cannot be completely closed. However, in the present invention, the pin member 64 is on the back side around the through hole 21c as described above even when the air outlet 25a around the air distribution duct 2 set in the lower mold 61 is slightly floating. It is configured to lock the tube wall 21f, close the mouth, and seal well.

  Thus, the back pad 1 </ b> A is foam-molded with the air distribution duct 2 and the backing material 3 inserted into the foaming mold 6. A duct 21 as a main part of the duct is arranged on the back surface 1b side of the back pad 1A, and the air introduction port 26e is exposed from the back pad back surface 1b (FIG. 4). The backing material 3 covers the substantially entire back surface side of the air distribution duct 2 so as to block the through holes 21c (FIG. 11). Therefore, the foaming raw material g is impregnated into the backing material 3 in the foam molding process, and the backing material 3 is attached and integrated with the back pad back surface 1b. The foaming raw material g does not enter the conduit 21 from the gap. Note that the backing material 3 that covers the air distribution duct back surface 2b side and is integrated with the back pad back surface 1b is configured such that when the back pad 1A is greatly bent by the back of the occupant, the air distribution duct 2 is formed from the back pad 1A. It also plays a role in preventing flaking.

When foam molding of the back pad 1A is completed and demolding (demolding process), the air ejection ports 25a are aligned with the plurality of air ejection ports 10 foam-molded on the front surface 1a, and air inlets are formed on the back surface 1b side. The desired quality-stable ducted back pad 1A in which 26e is exposed is obtained.
At the time of demolding, the head 641 of the pin member 64 interferes with the molded back pad 1A and the back-side tube wall 21f, but the back pad 1A is a foam having a high cushioning property. Can be extracted. The back side tube wall 21f is also flexible and can be removed. An extraction mark of the head 641 remains as a through hole 190. When the back pad 1A with the duct 2 is covered with a skin (not shown), a seat back for a backrest of the vehicle seat is obtained. Reference numeral 639 denotes a matching surface, 67 denotes a support bar, 68 denotes an arm, 68a denotes a hook, and PN denotes a pin.

(4) Effect According to the air distribution duct for seat pad configured as described above, the seat pad with the air distribution duct, and the manufacturing method thereof, the conduit 21 of the air distribution duct 2 extending in all directions may be warped. This facilitates and ensures the setting to the foaming mold 6. By foam molding of the seat pad 1 in which the air distribution duct 2 is embedded and integrated, the foam raw material g does not enter from the air outlet 25a, and the quality is stabilized and the yield is improved.

In particular, in the case of the air distribution duct 2 incorporated into the back pad 1A for the backrest, the pad thickness is small unlike the seat side cushion pad 1B. Even in the seat side cushion pad 1B, it is expected that the pad thickness will be reduced. It is necessary to arrange the air distribution duct 2 as close to the back pad back surface 1b as possible and further flatten it. In such a case, when the air distribution duct 2 is made by blow molding, the conduit tip 211 tends to warp with respect to the base 26. An air outlet 25a is provided on the surface 2a side of the conduit tip 211. If the air distribution duct 2 has no warp, when the raised portion 611 that forms the air outlet 10 in the lower die 61 and the protrusion 611a on the upper surface 611b of the raised portion, the set to the lower die 61 is arranged. It is sufficient to place the wind duct 2 at a predetermined position. The air outlet 25a is blocked by the protrusion 611a, or the conduit portion around the air outlet 25a comes into contact with the upper surface 611b of the raised portion, and the setting of the air distribution duct is completed. However, when the conduit tip portion 211 and the like are warped, the air outlet 25a of the conduit tip portion 211 is lifted from the protrusion 611a and the protruding portion upper surface 611b as shown by the chain lines in FIGS. After the injection, the foaming raw material g enters the conduit 21 from the air outlet 25a during the work process until the mold closing.
On the other hand, in the present invention, since the through hole 21c is provided in the rear surface side pipe wall 21f facing the air outlet 25a at the conduit tip portion 211, the pin member 64 is provided upright on the lower mold 61, After passing the head portion 641 of the pin member 64 through the through-hole 21c, the warp of the conduit tip portion 211 can be eliminated by locking the head portion 641 to the back-side tube wall 21f. Due to the flexible deformation of the synthetic resin molding conduit 21 around the through hole 21c, the head portion 641 penetrates through the through hole 21c, and the head portion 641 of the pin member 64 is locked to the back surface 2b of the back surface side tube wall 21f. This makes it possible to correct the warped conduit tip 211 in the chain line state of FIG.

In setting the air distribution duct 2 to the lower mold 61 in FIG. 6, the air distribution duct 2 is lowered from above the mold surface 610 so that the air outlet 25a is aligned with the protrusion 611a and the raised portion 611, and the head By simply pressing the back-side tube wall 21f around the through-hole 21c that interferes with 641 downward, the conduit portion around the air outlet 25a that has been in the open state is brought into contact with the upper surface 611b of the raised portion. The air outlet 25a can be closed and set. If a hemispherical protrusion 611a is provided on the upper surface 611b of the raised portion, the protrusion 611a can enter the air outlet 25a and the mouth can be closed more reliably. Even if the foaming raw material g that has entered the conduit 21 is removed by post-processing, it is after molding of the commercialized seat pad 1, and it is difficult to perform post-processing while ensuring product quality. If it cannot be removed, the product will be defective and the yield will be reduced. However, the present invention solves this problem without difficulty.
Further, the air distribution duct 2 is positioned and fixed by the through hole 21c, the pin member 64, and the protrusion 611a. When the air distribution duct 2 is set, the operation from the injection of the foaming raw material g to the completion of the mold closing is completed. Even if an inadvertent external force is applied during the process, the set air distribution duct 2 will not be displaced. It is conceivable that the foaming raw material g enters the conduit 21 through the gap between the through hole 21c and the pin member 64 due to the formation of the through hole 21c, but the backing material 3 covers the through hole 21c by closing the mold. Even if the backing material 3 is impregnated with the foaming raw material g, it does not reach the conduit 21 and does not cause any particular problem.
In this way, the present invention can prevent the rise of the conduit tip 211 without reducing the work load by reducing the work load with the set of the air distribution duct 2 and maintaining the quality of the seat pad 1 with the air distribution duct 2. It can be used to improve yields.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material and the like of the seat pad 1, the air distribution duct 2, the through holes 21c, the backing material 3 and the like can be appropriately selected according to the application. In the embodiment, the seat pad 1 is applied to the back pad 1A, but the seat pad 1B may be applied to the seat cushion pad 1B.

1 Seatpad 1a Surface (Seatpad surface)
10 Air outlet 2 Air distribution duct 2a Surface (air distribution duct surface)
2b Back side (back side of air distribution duct)
21 Conduit 21c Through-hole 21f Back side tube wall 211 Conduit tip (tip)
25a Air outlet 26 Base 26e Air inlet 6 Foaming type 61 Lower type (one split type)
64 Pin member 641 Head g Foaming raw material

Claims (5)

A conduit (21) extends from a base (26) having an air inlet (26e) on the back surface (2b) side, and an air outlet (25a) is provided in the conduit (21) on the front surface (2a) side. A synthetic resin seat pad air distribution duct (2),
An air distribution duct for seat pads, wherein a through-hole (21c) is provided in a back-side tube wall (21f) of the conduit (21) facing the air outlet (25a). The conduit (21) is branched in four directions from the base (26) so as to be substantially in the same plane, and the through-hole (21c) is provided at the tip (211) of the conduit (21) extending in the four directions. The air distribution duct for seat pads according to claim 1. A conduit (21) extends from a base (26) having an air inlet (26e) on the back surface (2b) side, and an air outlet (25a) is provided in the conduit (21) on the front surface (2a) side. A synthetic resin air distribution duct (2) and a seat pad (1) integrated by insert molding the air distribution duct (2),
A through hole (21c) formed through the back wall (21f) of the conduit (21) facing the air outlet (25a);
And further comprising a backing material (3) covering the through hole (21c) and covering the back surface (1b) of the seat pad including the back side pipe wall (21f) around the through hole (21c). Seat pad with air distribution duct as a feature. The conduit (21) is branched in four directions from the base (26) so as to be substantially in the same plane, and the through-hole (21c) is provided at the tip (211) of the conduit (21) extending in the four directions. The seat pad with an air distribution duct according to claim 3. A conduit (21) extends from a base (26) having an air inlet (26e) on the back surface (2b) side, and an air outlet (25a) is provided in the conduit (21) on the front surface (2a) side. The synthetic resin air distribution duct (2) is set in the foaming mold (6), and then the foaming raw material (g) is injected and the mold is closed, and then the air distribution duct (2) is embedded in the seat pad (1) is foam-molded, and each air outlet (25a) matches a plurality of air outlets (10) foam-molded on the seat pad surface (1a), and the back surface of the seat pad (1) ( 1b) A method of manufacturing a seat pad with a wind distribution duct in which the air inlet (26e) is exposed on the side,
A through-hole (21c) is provided in the back-side tube wall (21f) of the conduit (21) facing the air jet port (25a), while the foaming mold (6) is divided into a seat pad surface (1a ) Side of the split type (61) forming the side of the air distribution duct (2) to be set corresponding to the through hole (21c), the head (641) than the diameter of the through hole (21c) ) Pin member (64) with a large diameter
After the head (641) of the pin member (64) passes through the through hole (21c) due to the flexibility of the back side tube wall (21f) around the through hole (21c), the back side The head (641) is locked to the pipe wall (21f), and the air distribution duct (2) is set in the one split mold (61), while the other split mold (62) is provided with a backing material (3 ), And then close the mold and cover the through hole (21c) with the backing material (3), and then close the through hole (21c) by foam molding of the seat pad (1). A method of manufacturing a seat pad with an air distribution duct, characterized in that the backing material (3) is coated on the back surface (1b) of the seat pad together with the back side tube wall (21f) around the through hole (21c).

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