JP6092042B2 - Back pad and back material for back pad - Google Patents

Description

  The present invention relates to a vehicle seat and a back pad that constitutes a backrest and a back material for the back pad.

A back pad relating to a vehicle seat such as an automobile may generate an abnormal noise such as a rubbing sound with the movement of an occupant between the back pad and the pipe frame that supports the back pad. In order to prevent this abnormal noise, a cloth back surface material such as a nonwoven fabric is attached to the back surface of the back pad in recent years. The pad body is integrally formed by inserting a back material.
By the way, although a vertical hole for inserting a headrest stay is provided in the upper part of the back pad main body, it is difficult to apply the back material to the hole wall of the pad main body that forms the vertical hole. The back material is a flat sheet material cut and cut and then stitched into a shape along the back surface of the pad body. The conventional back material is simply cut out a hole such as a circular hole in the portion that overlaps the vertical hole. However, they were merely (JP 2005-238675, JP 2006-7418, 2011-143746, etc.). When the headrest is attached to the backrest, the stay, specifically the stay holder, comes into contact with the hole in the pad body that creates the vertical hole, causing a problem of rubbing noise caused by vehicle movement and occupant movement.
Inventions for improving such problems have been proposed (for example, Patent Documents 1 and 2).

JP-A-5-130923 Japanese Patent No. 4541778

However, Patent Documents 1 and 2 have the following problems.
Patent Document 1 states in paragraph 0010 “Furthermore, a through-hole portion 3 leading from the back surface to the surface is formed at the attachment position of the additional member 6 such as a headrest, and a reinforcing layer needs to be formed also in the through-hole portion 3. Invented “a molded reinforcing fabric for cushion material in which a non-woven fabric having moldability is formed into a shape suitable for a foam” according to claim 1, is a high-cost product. When making a relatively simple product without complicated undulations such as a back pad, do not rely on thermoforming of molded reinforcing fabric such as molded felt, but cut and stitch as in JP 2005-238675 It is much cheaper to make a three-dimensional shape.
Patent Document 2 is limited to the technical content of paragraph 0021, “the mounting hole 38 for the headrest is provided in the back cloth 14 at a position corresponding to the mounting hole 22 of the pad body 2”. The mounting hole 38 is only cut out in a U-shape on the back cloth, and even if the tongue piece portion in the U-shape is applied to the hole wall in the mounting hole 22, it remains on only one side wall of the hole wall. Since the remaining three pad bodies are bare hole walls, it is still difficult to prevent rubbing noise.

  The present invention solves the above-mentioned problem, maintains the cost reduction by using cutting and stitching, and yet applies the back material to all the peripheral wall surfaces of the hole wall, so that the vertical hole is accompanied with the vehicle running and the movement of the occupant. An object of the present invention is to provide a back pad and a back pad material for the back pad that can completely prevent rubbing noise generated around.

In order to achieve the above object, the gist of the invention described in claim 1 is a back seat for a back pad of a backrest having a seat body for a vehicle and having two or more stay insertion vertical holes (20) in a pad body (2). In the material, by cutting the cloth sheet material (F), the slits (40) are formed at the corresponding positions of the vertical holes (20), and the vertical holes are formed in both outer directions perpendicular to the length direction of the slits. The front part (42) and the longitudinal hole (20) on the front side of the vehicle with respect to the part where the longitudinal hole (20) is located, respectively, by interposing a clearance zone (Z) having a width corresponding to the height (h20). ) And a rear surface portion (43) on the rear side of the vehicle with respect to the portion on which the vehicle is located.Further, the cut cloth (4) cut is folded on the line of the slit (40), and both (42, 43 ) In the direction of crossing the zone width (Z1) of the clearance margin zone (Z) from the vicinity of both ends (40e) of the slit (40) By making the slit (40) into an upper cylindrical opening (520) in the vertical hole (20), the cylindrical part applied to the hole wall (201) that forms the vertical hole (20) of the pad body (2) (52) is provided on the back material for the back pad. According to a second aspect of the present invention, there is provided a back pad back material according to the first aspect of the present invention, wherein both slits (Z) are formed in the clearance zone (Z) between the two slits (40, 40) by cutting the sheet material (F). The cut cloth (4) is formed by further forming a hollow hole (44) that is line-symmetric with respect to a linear line (CP) connecting 40, 40).
The gist of the invention described in claim 3 is that in the back pad of the vehicle seat having two or more stay insertion vertical holes (20) in the pad main body upper part (22), by cutting the cloth sheet material (F), The slits (40) are formed at the corresponding positions of the vertical holes (20), and in the outer direction orthogonal to the length direction of the slits, the punching allowance zone has a width corresponding to the height of the vertical holes (h20). (Z) respectively, the front part (42) on the front side of the vehicle with respect to the part where the vertical hole (20) is present and the rear part on the rear side of the vehicle with respect to the part where the vertical hole (20) is present ( 43), and the cut fabric (4) thus cut is folded on the line of the slit (40), and the double fabric portion (5) is overlapped on both sides (42, 43). The slit (40) is inserted into the longitudinal hole (20) by stitching the slit (40) from the vicinity of both ends (40e) in the direction crossing the zone width (Z1) of the boring zone (Z). of A back surface material (3) provided with a cylindrical portion (52) applied to a hole wall (201) that forms a vertical hole (20) of the pad main body (2) in a side tube portion opening (520), and the back surface material The cylindrical portion (52) of (3) is attached to the hole wall (201), and the front surface portion (42) and the rear surface portion (43) of the back surface material are attached to the back surface (2b) to be integrally foamed. And a pad body (2) to be provided.

As in the first and third aspects of the invention, when the slit (40) is formed and the front part (42) and the rear part (43) are formed with the clearance allowance zone (Z) interposed, folding is performed on the slit line. By setting it as a double double cloth, the cloth part for cylinder parts can be provided in the part of a boring allowance zone. When the tubular portion cloth portion is stitched, the tubular portion with the tubular portion is formed, and the tubular portion applied to the vertical hole can be easily formed on the sewn back surface material.
As in the second aspect of the invention, in the clearance zone (Z) between the two slits (40, 40), the hole is symmetrical with respect to the line (CP) connecting the slits (40, 40). When (44) is further formed, when cutting from the double cloth portion to the tube portion cloth portion, the cutting to the outer peripheral edge shape of the back surface material existing between both slits is made to match the corresponding location on the back surface of the pad body. Can be cut simultaneously.

  Since the back pad and the back material for the back pad of the present invention attach the cylindrical part to all the peripheral wall surfaces of the hole wall forming the vertical hole, and attach and integrate the back material with the cylindrical part by foam molding of the pad body, Not only can the rubbing noise that occurs around the vertical hole as the vehicle travels and the movement of the occupant be eliminated almost completely, but the back material with the tube can be made of sewn products without relying on molded felt. Exhibits excellent effects such as cost effectiveness.

It is one form of the back pad of this invention, and the back material for back pads, and is a top view of the cutting cloth for back materials. It is a top view of the back material produced by folding and sewing the cut cloth of FIG. It is a fragmentary perspective view which shows a mode just before setting the back surface material of FIG. 2 to a middle type. It is a fragmentary perspective view which shows the state which set the back surface material of FIG. 2 to the middle type. (A) is a cross-sectional view corresponding to FIG. 3, and (b) is a cross-sectional view corresponding to FIG. (A) is a longitudinal sectional view of the back pad, and (b) is a partially enlarged view of (a). It is explanatory sectional drawing of the mold open state which shows a mode that foam molding of a back pad is carried out. It is explanatory sectional drawing of the mold closing state which shows a mode that foam molding of a back pad is carried out. (A) is a perspective view of a back pad, (B) is an enlarged perspective view around a vertical hole of (A), and (C) is a plan view of (B). FIG. 4 is another embodiment of the back pad back material, in which (a) is a developed plan view of the cut cloth, (b) is a plan view of the back material, and (c) is a view taken along line XX of (b). FIG. 4 is a reference view of a back pad rear material, in which (a) is a developed plan view of the cut cloth, and (b) is a perspective view of a main part showing a state in which the back material is set in a middle size.

  Hereinafter, the back pad and the back material for back pad according to the present invention will be described in detail. 1 to 10 are one form of the back pad and the back material for the back pad of the present invention, FIG. 1 is a plan view of the cutting cloth for the back material, and FIG. 2 is obtained by folding and sewing the cutting cloth of FIG. FIG. 3 and FIG. 4 are partial perspective views showing how the back material of FIG. 2 is set in the middle mold, FIG. 5 is a cross-sectional view corresponding to FIG. 3, and (b) is FIG. FIG. 6 is a longitudinal sectional view of the back pad, (b) is a partially enlarged view of (a), and FIGS. 7 and 8 are explanatory sectional views showing how the back pad is foam-molded. 9A is a perspective view of the back pad, FIG. 9B is an enlarged perspective view around the vertical hole of FIG. 9B, FIG. 9B is a plan view of FIG. 10B, and FIG. An explanatory diagram is shown. In each drawing, the slit 40 is drawn with emphasis, and FIGS. 5 (b), 6 (a), and 9 (c) are drawn slightly apart from the pad body 2 for easy understanding of the back surface material 3. .

(1) Back Pad Back Material The back pad back material 3 is a back pad of a vehicle seat having two or more stay insertion vertical holes 20 in the pad main body upper part 22, and is integrally attached to the back surface 2 b of the pad main body 2. This is a sewn back material. The back material 3 is a sewn product cut and stitched from a cloth-like sheet material F such as a nonwoven fabric.
In the cut cloth 4 cut from the flat sheet material F, slits 40 having a length substantially equal to the circumferential length of each vertical hole 20 are cut linearly. The cut cloth 4 having the slit 40 is folded on the slit 40 line to form the double cloth portion 5 of the cutting allowance 41, and further, the tubular cloth portion 52a related to the double cloth portion 5 is stitched vertically. The back surface material 3 is provided with a cylindrical portion 52 applied to the hole wall 201 of the hole 20. The cutting cloth 4 is formed by cutting the sheet material F and simply forming a circular hole at each corresponding position of the vertical hole 20 as disclosed in JP-A-2005-238675. This is greatly different from the conventional cutting cloth that has formed only the rear surface portion 43.

  In the sheet material F and the cut cloth 4 of the back surface material 3, the necessary fabric area of the cylindrical portion forming boring allowance zone Z applied to the hole wall 201 of the vertical hole 20 is secured in addition to the front surface portion 42 and the rear surface portion 43. . By cutting the sheet material F made of flat material, slits 40 are formed at the corresponding positions of the vertical hole 20 so as to be on the same line at a plurality of positions (plurality), and perpendicular to the length direction of the slit 40. The front end portion 42 and the vertical hole 20 are located in front of the vehicle with respect to the portion where the vertical hole 20 is located, with the punching allowance zones Z having widths matched to the vertical hole height h20 being interposed in both outward directions. The cutting cloth 4 is formed with a rear surface portion 43 on the vehicle rear side of the part. The “vehicle front” in the present invention refers to the left side of the vehicle in the state where the back pad is installed on the vehicle as shown in FIG. 6, and “upward” refers to the upper side of the same figure. Point to.

  A slit 40 is formed in the sheet material F, and a fabric zone width Z1 of the drag zone Z is secured in one direction orthogonal to the slit 40, and the fabric of the front surface portion 42 extends beyond the fabric zone width Z1. The fabric zone width Z1 of the drag zone Z is secured in the other direction orthogonal to the slit 40, and the fabric of the rear surface portion 43 extends beyond the fabric zone width Z1. The cloth of the thread allowance zone Z is traversed and folded on the slit 40 line to form a double cloth part 5 provided with a cloth part for cylinder part 52a. If the part of the punching allowance 41 is raised with respect to the front surface part 42 and the rear surface part 43 around the slit 40, a cylindrical cloth part 52 a that is three-dimensionalized for the vertical hole 20 is used. Even when the two-dimensional sheet material F is used, the upper and lower portions 42u of the front surface portion 42 and the upper portion 43u of the rear surface portion 43 are formed as shown in FIG. The cylindrical three-dimensional cylindrical part 52 extends from the vertical direction and can be formed upright.

A height corresponding to the height h20 of the vertical hole is ensured in the tube portion fabric portion 52a related to the double fabric portion 5 by the zone width Z1 of the boring allowance zone Z. Here, the zone width Z1 is slightly smaller than the vertical hole height h20. In the present embodiment, when the back pad 1 is completed, as shown in FIGS. 6 and 9, the upper opening edge 521 of the cylindrical portion 52 is slightly recessed into the vertical hole 20 rather than the upper opening 200 of the vertical hole 20. Become.
The fabric portion that does not become the tubular portion fabric portion 52a in the cutting allowance zone Z is cut and removed when the slit 40, the front surface portion 42, and the rear surface portion 43 are cut. By cutting the sheet material F, in the clearance zone Z between the two slits 40, a hollow hole 44 is formed which is symmetric with respect to the linear line CP connecting the two slits 40, and the portion of the hollow hole 44 is formed. In addition, the part removed from the cylinder part cloth part 52a is removed by one-shot cutting (FIG. 1). When the cut cloth 4 is formed from the sheet material F, only the tube portion cloth portion 52a remains in the punching allowance 41. The slit 40 is cut into the developed cylindrical portion 52a. A hollow hole 44 is formed between the tube portion cloth portions 52a having the two left and right slits 40, and an elongated notch portion k is formed to open outward on the left and right sides of the tube portion cloth portions 52a. Reference numeral 431 denotes a notch in the rear surface, and reference numeral 432 denotes a rear edge.

As described above, a single piece of the cut cloth 4 is obtained by cutting the slit 40, the tube portion cloth portion 52a, the front face portion 42, and the rear face portion 43. The cut cloth 4 is further stitched to form the back surface material 3. . Sewing allowances 52a ₉ , 429, and 439 as shown in FIG. 4 are provided at the stitched portions of the tube portion cloth portion 52a, the front portion 42, and the rear portion 43 of the cut cloth 4 cut and cut from the sheet material F. It is secured.
The cut cloth 4 is folded on the slit 40 line and overlapped with each other in the direction of crossing the zone width Z1 of the tapping allowance zone Z from the cylindrical cloth portion 52a near the slit both ends 40e. Thus, a cylindrical portion 52 that is applied to the hole wall 201 of the pad main body 2 that forms the vertical hole 20 is provided (FIG. 6B).

More specifically, a single piece of the cut cloth 4 is folded on the line CP of the slit 40 so that the front cloth 42 and the rear cloth 43 are overlapped with each other in the double cloth section 5 and double near the slit both ends 40e. in a direction across the zone width Z1 of the cash zone Z haul respectively from the distal end portion 52a ₁ of the turned-cylinder unit cloth portions 52a, sutured to the roots site 52a ₂ of the cylindrical portion cloth portion 52a. As shown in FIG. 2, the tip end portion 52a ₁ is an edge portion on the slit 40 side in the tube portion cloth portion 52a, and the root portion 52a ₂ is the end of the tube portion cloth portion 52a that is farther from the slit 40. It is an edge part. The vertical hole 20 of the pad main body 2 is sewn from the vicinity of the slit end portion 40e to the boundary area between the boring margin 41, the front surface portion 42, and the rear surface portion 43 at the cylindrical cloth portion 52a of the double cloth portion 5. A cylindrical portion 52 is provided to be applied to the hole wall 201 for forming the. When the cylindrical portion 52 is formed, the slit 40 becomes an upper opening 520 of the cylindrical portion 52 in the vertical hole 20.

When the cut cloth 4 is formed from the sheet material F, the tube portion cloth portion 52a is cut into a shape that spreads from the point on the slit 40 side toward the front surface portion 42 and the rear surface portion 43 as shown in FIG. Furthermore, towards the distal end portion 52a ₁ of the doubled folded over the slit line CP cylindrical portion cloth portion 52a to the root portion 52a _2, is sewn to the tubular portion 52 extending in a truncated reverse V shape. This is because the foaming of the pad body 2 facilitates the setting of the back material 3 to the foaming mold 6 (details will be described later).
A desired back material 3 as shown in FIG. 2 is obtained by stitching the outer peripheral edge 51 of the double cloth portion 5 in which the front surface portion 42 and the rear surface portion 43 overlap with the stitch forming the cylindrical portion 52.

Stitching seam 52N reaching the root portion 52a ₂ of the cylindrical portion cloth portion 52a leads to stitch 51N suturing the outer peripheral edge 51 of the double fabric portions 5 (Fig. 2). The back material 3 thus formed is a contact member that can contact all the back surfaces 2b from the vehicle front main portion 21 to the rear portion 23 through the upper portion 22 to the rear portion 23 as shown in FIGS. .
The front surface portion 42 of the back surface material 3 is attached to the back surface 2b of the vehicle front side upper portion 22 rather than the portion where the back surface 2b and the vertical hole 20 of the vehicle front side main portion 21 related to the pad main body 2 are present, and the rear surface portion 43 is formed. It becomes a part which adheres to the back surface 2b of the vehicle rear side upper part 22 rather than the site | part in which the back surface 2b and the vertical hole 20 of the vehicle rear side rear part 23 which concern on the pad main body 2 exist. The front surface portion 42 bears the pad main body rear surface 2b of the side portion 24.

Moreover, the schematic of the back surface material 3 for back pads of another aspect is shown in FIG. FIG. 10A is a plan view of the cut cloth 4 of the back material 3, FIG. 10B is a plan view of the back material 3 formed by stitching the cut cloth 4 of FIG. 10A, and FIG. It is an arrow view. The back pad 1 of the rear seat of the vehicle is provided with three cylindrical portions 52 that are applied to the hole wall 201 of the vertical hole 20 by the back material 3 that is attached to the back surface 2b of the pad main body 2.
Other configurations are the same as those of the back material 3 of FIGS. 1 to 9 indicate the same or corresponding parts.

(2) Back pad The back pad 1 is a back pad of a vehicle seat having two or more stay insertion vertical holes 20 in the pad main body upper part 22. The back pad 1 has the back surface material 3 shown in FIGS. 2 to 6 and the cylindrical portion 52 of the back surface material 3 attached to the hole wall 201, and the front surface portion 42 and the rear surface portion of the back surface material 3. 43 is attached to the back surface 2b, and is integrally foam-molded.

The back material 3 is the aforementioned sewing product. By cutting the sheet material F, a slit 40 is formed at a corresponding position of the vertical hole 20, and a punching allowance zone Z having a width corresponding to the vertical hole height h 20 is formed in both outer directions orthogonal to the length direction of the slit 40. The cut cloth 4 is formed by forming a front surface portion 42 on the front side of the vehicle and a rear surface portion 43 on the rear side of the vehicle from the portion where the vertical hole 20 exists, and the back surface material 3 is obtained by sewing them. It is done. By sewing the cut cloth 4 on the slit line CP at the portion of the double cloth portion 5 from the vicinity of both ends 40e of the slit 40 in the direction crossing the zone width Z1 of the punching zone Z, The back surface material 3 is provided with a cylindrical portion 52 applied to the hole wall 201 that forms 20. Specifically, the back surface of the tubular portion 52 by sewing and the tubular portion fabric portions 52a distal end portion 52a ₁ of according to the double fabric portions 5 in the vicinity of the slit end portions 40e so as to traverse the zone width Z1 is provided Material 3 is used.

  The pad main body 2 is a foam molded product formed in the shape of the backrest of the driver's seat back pad 1 using a foamed resin raw material such as a polyurethane material (FIGS. 6 and 9). As shown in FIG. 6, the pad main body 2 extends from the front main portion 21 serving as the backrest portion of the occupant to the upper portion 22 where the headrest 8 is mounted, and then bends downward to form a recess u. The rear side rear part 23 hangs down. As for the side edge part of the front side main part 21, the upper half part protrudes behind a vehicle like FIG. 9, then curves inward and connects with the rear part 23 to form a recess u. A vehicle body side pipe frame is mounted in the recess u to stably support the pad main body 2.

A vertical hole 20 for stay mounting is formed in the upper portion 22 of the pad main body 2 by foaming. In the foam molding, the inserted back material 3 adheres to the pad main body back surface 2b, but the cylindrical portion 52 is formed so that the slit 40 becomes the upper side opening 520 of the cylindrical portion 52 in the vertical hole 20. It adheres to the hole wall 201 of the vertical hole 20, and the pad main body 2 is integrally foam-molded with the back material 3 (FIG. 6).
Here, the vertical hole 20 is a square hole as shown in FIG. 9, and in accordance with this, the cylindrical portion 52 of the back material 3 is also a square cylinder. As shown in FIG. 9 (c), the tube portion cloth portion 52a on the front surface portion 42 side located on the upper side of the figure is bent into a U-shape, and the tube portion cloth portion 52a on the rear surface portion 43 side located on the lower side of the drawing. Can be raised upright on the upper portion 42u of the front surface portion 42 and the upper portion 43u of the rear surface portion 43, which are attached to the back surface 2b of the pad main body upper portion 22. In FIG. 9C, if the square hole of the vertical hole 20 is provided in a state rotated by 45 ° about the center thereof, the cylindrical cloth portion 52a on the front face 42 side, the rear face 43 side It is only necessary to bend the tubular portion fabric portion 52a into a dogleg shape, and the tubular portion 52 can be erected more easily.

  Since the cylindrical portion 52 is literally finished into a cylindrical body, the hole wall 201 related to the pad body 2 that forms the vertical hole 20 as shown in FIGS. 6 and 9 is covered by 360 degrees. Since the width Z1 of the punching allowance zone matching the vertical hole height h20 is provided in both outer directions orthogonal to the length direction of the slit 40, the tubular portion fabric portion 52a is formed, so the height direction of the vertical hole 20 The cylindrical portion 52 is applied to substantially the entire area of the hole wall 201.

  Here, before reaching the present invention, the present inventors invented the improved back surface material RN of FIG. 11 (b) formed by stitching the cut cloth 4 shown in FIG. 11 (b). The outer peripheral edge of the cut cloth CL provided with the H-shaped slit SL at a position corresponding to the vertical hole 20 was stitched to obtain an improved back surface material RN. 7 and 8, the cut cloth CL is set in the middle mold 63 so that the protruding portion 631 is passed through the H-shaped slit SL, and the pad main body 2 is foam-molded. Countermeasures were insufficient. When the back surface material RN of FIG. 11 (b) is adhered and integrated to the pad main body back surface 2b, the two tongue pieces TH surrounded by the slits SL are formed on the two wall surfaces of which there are hole walls in four directions. I stayed in contact. Compared to the one that has a hole on one side of the wall as in Patent Document 2, the countermeasure against abnormal noise is improved, but the remaining two walls expose the pad body itself. The abnormal noise generation could not be suppressed.

  On the other hand, the back material 3 of the present invention covers the vertical holes 20 of the pad main body 2 by applying the cylindrical portions 52 to all four wall surfaces of the quadrangular columnar hole wall 201 (FIG. 9). In the vertical hole 20, there is no portion where the pad body 2 is exposed except in the vicinity of the upper opening 200 of the vertical hole 20. In the present embodiment, as shown in FIGS. 6 and 9, the upper opening edge 521 of the cylindrical portion 52 is slightly retracted into the vertical hole 20 rather than the upper opening 200 of the vertical hole 20, but the pad main body 2 is very exposed. There is no problem at all. Further, the actual pad main body 2 has an opening at the opening of the vertical hole 20 extending from the upper opening edge 521 of the cylindrical portion 52 toward the upper opening 200 of the vertical hole 20. The HL does not come into direct contact with the pad main body 2 and measures against abnormal noise are taken. Reference numeral 25 indicates a raised portion for a vertical hole formed on the pad main body upper portion 22.

Next, a method for manufacturing the back pad 1 will be described.
Prior to the manufacture of the back pad 1, the back surface material 3 with the cylindrical portion 52 as shown in FIGS. 2 and 3 is prepared. The foaming mold 6 used for manufacturing the back pad 1 is a foaming mold as shown in FIGS. 7 and 8, and includes a lower mold 61, an upper mold 62, and a middle mold 63. When the mold is closed as shown in FIGS. 7 to 8 using the hinge 69 as a fulcrum, the mold surface 610 of the lower mold 61, the mold surface 630 of the middle mold 63, and the mold surface 620 of the upper mold 62 having a large degree of depression as a whole. Thus, the cavity C of the back pad 1 in which the back material 3 is integrated with the pad main body 2 is formed. In this manufacturing method, the surface 2 a side of the back pad 1 is formed by the mold surface 610 of the lower mold 61 and the mold surface 620 of the upper mold 62, and the back surface 2 b side of the back pad 1 is molded by the mold surface 630 of the middle mold 63.

The back pad 1 is manufactured using the foaming mold 6 and the back material 3 as follows, for example. First, the foaming mold 6 is set in the mold open state (FIG. 7). Next, the back material 3 is set on the middle mold 63 under this mold open state.
The middle die 63 is provided with a shaft-like protruding portion 631 in the shape of the vertical hole 20 so as to protrude from the main portion. When wearing the setter, the projecting portion 631 is passed through the cylindrical portion 52 as shown in FIG. 5 (a) so that the hand is passed through the arm portion of the theta, and the back material 3 is attached to the middle die 63 as shown in FIG. 5 (b). Set. The protruding portion 631 has a quadrangular prism shape, and a root portion of the protruding portion 631 expands along the cylindrical portion 52. Under the mold open state of FIG. 7, the state of FIG. 3 is changed to the state of FIG. 4, and the back material 3 is set on the middle mold 63. Even if the tubular portion 52 is sewn and folded, the tubular portion 52 has a tubular opening that spreads in the shape of an eight-shape toward the root portion 52a ₂ , so that the protruding portion 631 extends to the large mouth on the root portion 52a ₂ side. Enter without difficulty. The cylindrical portion 52 has a rectangular cylindrical shape that covers and surrounds the protruding portion 631. As shown in the enlarged view in the circle of FIG. 4, the protruding portion 631 slightly protrudes from the upper opening edge 521 of the cylindrical portion 52.
Although not shown in the drawings, a ferrite tape piece is attached to an appropriate portion of the back surface material 3 and a permanent magnet is exposed on the mold surface 630 of the middle mold 63 corresponding to the tape piece. The back material 3 is securely set on the mold surface 630 of the middle mold 63.

  Next, a predetermined amount of foaming raw material g is injected while the mold is open (FIG. 7), and then the mold is closed. By closing the upper mold 62, the lower mold 61, and the middle mold 63, the cavity C of the back pad 1 into which the back material 3 is inserted is formed (FIG. 8). At the same time, the tip of the protruding portion 631 comes into contact with the raised portion 611 of the lower mold 61 to prepare for forming the vertical hole 20. In the figure, reference numerals 619, 629, and 639 denote mold matching surfaces, reference numeral 67 denotes a support bar, reference numeral 68 denotes an arm, and reference numeral 68a denotes a hook.

After closing the mold, the process proceeds to foam molding of the pad body 2. The mold closed state is maintained for a predetermined time, and the pad main body 2 as shown in FIGS. 6 and 9 is foam-molded so that the back surface material 3 is attached and integrated on the back surface 2b side. Thus, the back pad 1 in which the pad main body 2 and the back surface material 3 are integrated is manufactured.
Since the cylindrical portion 52 surrounds the quadrangular columnar protruding portion 631 and the back material 3 is set on the middle die 63, a cylindrical shape is formed on all wall surfaces that circulate the pad body hole wall 201 that forms the vertical hole 20. The desired back pad 1 in which the formed cylindrical portion 52 is adhered and integrated is completed.
When the back pad 1 is covered with an unillustrated skin, it becomes a backrest for the backrest of the vehicle seat.

(3) Effect The back pad and the back pad back material 3 configured as described above cut the two-dimensional sheet material F without relying on the thermoforming of a molding reinforcing cloth such as a molding felt as in Patent Document 1. Since the back material is made by sewing, the back pad 1 having a relatively simple three-dimensional shape can be produced at low cost and is extremely useful.
And even if it says the sewing back material 3, unlike the back material 3 of patent document 2, the cylinder part 52 of the back material 3 covers and forms the cylinder part around the hole wall 201 which concerns on the vertical hole 20 360 degree | times. 52 is attached to the hole wall 201, and the back pad 1 in which the back surface material 3 is integrated with the pad main body 2 is completed, so that the generation of abnormal noise can be reliably suppressed.
Only one wall surface of the four sides of the hole wall is applied to the tongue piece part cut out in the U-shape of Patent Document 2, or only two wall surfaces of the four sides of the hole wall as shown in FIG. Unlike the case in which the back surface material 3 is not broken, the back surface material 3 covers and covers all four peripheral wall surfaces of the hole wall 201 at the four sides of the hole wall 201, so that countermeasures against abnormal noise become a meteorite. The rubbing sound generated around the vertical hole 20 as the vehicle travels and the passenger moves can be completely prevented.

In addition, by cutting the sheet material F, slits 40 are formed at corresponding positions of the vertical hole 20 and have widths that match the vertical hole height h20 in both outer directions orthogonal to the length direction of the slit 40. A front part 42 on the front side of the vehicle with respect to the part where the vertical hole 20 exists and a rear part 43 on the rear side of the vehicle with respect to the part where the vertical hole 20 exists are formed by interposing the punching zone Z. Since the back material 3 is finished by stitching the single piece of the cut cloth 4, the stitching operation is facilitated unlike the case of stitching a plurality of cut pieces. There is no work burden of cutting a plurality of cut pieces and selecting individual cut pieces to be sewn from each cut piece, or adjusting the direction of the cut pieces and adjusting them. You will be spared the burden of inventory management for each of the multiple pieces.
Thus, the back material 3 is obtained by sewing one piece of the cut cloth 4, further reducing the cost, and smoothly performing the sewing work. Further, when a hollow hole 44 that is symmetric with respect to the linear line CP that connects the two slits 40 is formed in the clearance zone Z between the two slits 40 of the cutting cloth 4, In accordance with the cutting, the outer peripheral edge shape of the back surface material 3 existing between both slits 40 is adapted to the corresponding portion of the pad main body back surface 2b so that it can be simultaneously processed by a single cutting process, thereby reducing the labor burden. .

Furthermore, since the sheet material F having a two-dimensional shape is used, it is conventionally difficult to easily form the three-dimensional cylindrical portion 52 that covers the periphery of the hole wall of the vertical hole 20 with the back material 3 made of one piece of the cut cloth 4. Although it has been seen, a front part 42 and a rear part 43 are formed in both outer directions perpendicular to the slit length direction to form a front part 42 and a rear part 43. By securing the portion 52a, this can be solved without difficulty.
Even if the two-dimensional sheet material F is used, if the cloth of the tapping allowance zone Z is traversed and folded on the slit 40 line to form the double cloth portion 5, a tubular portion fabric portion 52a is provided, and the tubular portion fabric portion 52a is provided. Thus, the cylindrical three-dimensional cylindrical portion 52 that exhibits power for preventing abnormal noise can be extended on the upper portion 42u of the front surface portion 42 and the upper portion 43u of the rear surface portion 43, and this can be easily erected. .

  In addition, when forming the cylindrical portion 52 on the back material 3, if the cut cloth 4 is folded on the slit line CP, a cylindrical portion fabric portion 52 a is immediately prepared at the site of the double fabric portion 5. Folding on the line of the slit 40, and after that, if the tube portion fabric portion 52a is sewn so as to have the shape of the tube portion 52, the tube portion 52 applied to the hole wall 201 forming the vertical hole 20 is present. Finished on the back material 3. In addition, if the cut cloth 4 is folded on the slit line CP, the slit 40 becomes the opening on the upper side of the vertical hole 20 as it is.

More, the portion of the double fabric portions 5 folded over the line of the slit 40, and suture toward the distal end portion 52a ₁ of the cylindrical portion cloth portion 52a became double the root portion 52a _2, eight When the cylindrical portion 52 spreads in a letter shape, the back surface material 3 can be easily set on the foaming mold 6. The protruding portion 631 of the middle die 63 can be smoothly inserted into the mouth of the base portion of the cylindrical portion 52 that spreads in the trumpet shape of the cylindrical portion 52. In addition, when the tubular portion 52 that spreads in the shape of an eight-shape is sewn, it exhibits numerous excellent effects such as making it easier to stand the tubular portion 52 with respect to the front surface portion 42 and the rear surface portion 43 around the tubular portion 52. To do.

  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 back pad 1, the pad body 2, the vertical hole 20, the back surface material 3, the cut cloth 4, and the double cloth portion 5 can be appropriately selected according to the application.

DESCRIPTION OF SYMBOLS 1 Back pad 2 Back pad main body 2b Back surface 20 Vertical hole 201 Hole wall 3 Back material 4 Cutting cloth 40 Slit 42 Front surface part 43 Rear surface part 44 Hollow hole 5 Double cloth part 52 Cylindrical part 520 Upper side opening 82 of a cylindrical part 82 Stay ( Headrest stay)
CP linear line (slit line)
F sheet material

Claims (3)

In the back seat material for the backrest of the backrest having two or more stay insertion vertical holes (20) in the pad body (2) in the vehicle seat seat,
By cutting the cloth sheet material (F), slits (40) are formed at the corresponding positions of the vertical holes (20), and the height of the vertical holes (in both outer directions perpendicular to the length direction of the slits ( h20), the front part (42) and the longitudinal hole (20) on the front side of the vehicle from the part where the longitudinal hole (20) is located. A rear surface portion (43) on the rear side of the vehicle with respect to the portion to be cut, and further, the cut fabric (4) thus cut is folded on the line of the slit (40), and both (42, 43) are overlapped. In the region of the double fabric portion (5), the slit (40) is sewn in the direction crossing the zone width (Z1) of the boring allowance zone (Z) from the vicinity of both end portions (40e) of the slit (40). (40) is an upper cylindrical opening (520) in the vertical hole (20), and a cylindrical part (52) is provided that is applied to the hole wall (201) that forms the vertical hole (20) of the pad body (2). Back pad, characterized by being made Face material. By the cutting process of the sheet material (F), it is symmetrical about the linear line (CP) connecting both slits (40, 40) in the clearance zone (Z) between the both slits (40, 40). The back pad backside material according to claim 1, wherein a cut hole (44) is further formed to form the cut cloth (4). In the back pad of the vehicle seat with two or more stay insertion vertical holes (20) in the pad main body upper part (22),
By cutting the cloth sheet material (F), slits (40) are formed at the corresponding positions of the vertical holes (20), and the height of the vertical holes (in both outer directions perpendicular to the length direction of the slits ( h20), the front part (42) and the longitudinal hole (20) on the front side of the vehicle from the part where the longitudinal hole (20) is located. A rear surface portion (43) on the rear side of the vehicle with respect to the portion to be cut, and further, the cut fabric (4) thus cut is folded on the line of the slit (40), and both (42, 43) are overlapped. In the region of the double fabric portion (5), the slit (40) is sewn in the direction crossing the zone width (Z1) of the boring allowance zone (Z) from the vicinity of both end portions (40e) of the slit (40). (40) is an upper cylindrical opening (520) in the vertical hole (20), and a cylindrical part (52) is provided that is applied to the hole wall (201) that forms the vertical hole (20) of the pad body (2). Back material (3) made,
The cylindrical portion (52) of the back material (3) is attached to the hole wall (201), and the front surface portion (42) and the rear surface portion (43) of the back material are attached to the back surface (2b). A back pad comprising a pad body (2) formed by integral foam molding.

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