JP5998860B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. Specifically, the present invention relates to a vehicle seat in which an air passage connected to a duct coming from a seat back is formed on a seat cushion pad.

  2. Description of the Related Art Conventionally, in a vehicle seat, a configuration in which a centrifugal fan (intake fan) is provided below a seat cushion is known (Patent Document 1). The intake fan has an intake port connected to a connection port formed in the back surface portion of the seat cushion pad, and from the seat cushion seating surface through an air distribution passage formed through the seat cushion pad. It is configured to inhale air. The air distribution path in the seat cushion pad is formed by penetrating through the rear surface of the seat cushion pad so as to communicate with the air distribution path formed in the seat back pad.

JP 2005-348997 A

  However, if the air distribution path formed in the seat cushion pad extends to the rear side so as to penetrate the rear surface of the seat cushion pad as described above, the butt that receives a large seating load from the occupant's buttocks The cushion structure of the support part becomes fragile and easily collapses. The present invention was devised as a solution to the above-mentioned problem, and the problem to be solved by the present invention is to provide a seat cushion pad with an air passage connected to a duct coming from a seat back as a seating load. On the other hand, it is to be formed so as not to be crushed.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
1st invention is a vehicle seat by which the ventilation path connected with the duct which comes from a seat back was formed in the seat cushion pad. The ventilation path is formed by extending a lower layer region near the back surface portion of the seat cushion pad in the in-plane direction, and a duct connection port connected to the duct is formed by opening the back surface portion of the seat cushion pad. Yes.

  According to the first aspect of the invention, since the ventilation path is formed by extending the lower layer region in the in-plane direction, even if the surface layer portion close to the seating surface of the seat cushion pad is crushed by the seating load of the occupant. The ventilation path is not easily crushed. Thus, in the seat cushion pad, the ventilation path connected to the duct coming from the seat back can be formed so as not to be crushed with respect to the seating load.

  The second invention is the following configuration in the first invention described above. The seat cushion pad has a back surface formed in a mountain shape that has the largest bulge in the lower side at the intermediate portion in the longitudinal direction of the seat. A duct connection port is formed to open in a region on the rear side of the top of the mountain on the back surface portion of the seat cushion pad.

  According to the second aspect of the invention, since the duct is disposed so as not to straddle the top of the mountain on the back surface portion of the seat cushion pad, the duct is located on the upper side by the back surface portion of the seat cushion pad. No excessive load that can be pushed and bent. In addition, since the duct is arranged so as not to cross the top of the mountain, the duct does not pass further below the portion where the pad thickness of the back surface portion of the seat cushion pad is the thickest. Therefore, the installation space in the height direction can be kept compact.

  The third aspect of the invention is the following structure of the second aspect of the invention described above. An electric fan is installed in the lower part of the seat cushion, and the electric fan is connected to an electric fan connecting port that is formed in the back surface of the seat cushion pad and communicates with the above-described air passage. The fan connection port is formed so as to open in a region in front of the peak of the mountain on the back surface portion of the seat cushion pad.

  According to the third aspect of the present invention, the fan is connected to the fan connection port formed in the region in front of the peak on the back surface of the seat cushion pad so that the fan and the duct are separated from the peak of the peak. It is possible to achieve an optimal arrangement state in which the arrangement is distributed in separate areas before and after the arrangement.

1 is a perspective view showing a schematic configuration of a vehicle seat of Example 1. FIG. It is a disassembled perspective view of a seat cushion. It is the perspective view which looked at the seat cushion pad from the back side. It is the perspective view which looked at the seat cushion from the back side. It is the VV sectional view taken on the line of FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the sheet 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the seat 1 of this embodiment is configured as a passenger seat of an automobile, and includes a seat back 2 that serves as a backrest portion for a seated occupant and a seat cushion 3 that serves as a seating portion. The seat cushion 3 is installed on the floor of the vehicle with a pair of left and right slide devices 4 interposed therebetween, and is provided in such a manner that the installation position relative to the floor can be adjusted in the seat front-rear direction. Yes. The seat back 2 has lower end portions on both the left and right sides connected to rear end portions on both the left and right sides of the seat cushion 3 via a reclining device (not shown). It is in a state where it is provided so that the (angle) can be adjusted in the longitudinal direction of the seat.

  The seat 1 described above sucks external air from the seat back surface of the seat back 2 on which the back of the seated occupant leans and the seat cushion 3 on which the thigh of the seated occupant presses, respectively. An air intake device 10 is provided for exhausting air to the bottom of the seat cushion 3. The air intake device 10 is constituted by a centrifugal air exhaust device 11 installed at the bottom of the seat cushion 3, and air is supplied from an air intake port 11 </ b> A directed upward of the seat by rotation of an internal fan of the air exhaust device 11. The air is exhausted from the exhaust port 11B directed to the front side of the seat.

  In the above-described exhaust fan 11, the intake port 11 </ b> A is connected to the intake connection port 3 </ b> Pd <b> 1 formed on the back surface portion (lid cover 3 </ b> Pd) of the seat cushion pad 3 </ b> P via the first duct 12. The intake connection port 3Pd1 is formed in a shape communicating with a ventilation groove 3Pa having a plurality of air distribution paths penetrating to a seating surface (upper surface) formed in the seat cushion pad 3P. Thereby, by the operation of the exhaust fan 11, external air is sucked downward from the seating surface of the seat cushion 3 through the ventilation groove 3Pa.

  Further, a second duct 13 different from the first duct 12 described above is further connected to the bottom of the seat cushion pad 3P. The second duct 13 connects the duct connection port 3Pd2 formed on the back surface portion (lid cover 3Pd) of the seat cushion pad 3P and the bellows-shaped third duct 14 guided from the seat back 2. Thus, the ventilation groove 3Pa in the seat cushion pad 3P and the third duct 14 are in a state of communicating with each other. The duct connection port 3Pd2 described above is formed in a state of communicating with the ventilation groove 3Pa formed in the seat cushion pad 3P described above. Although not shown, the third duct 14 is in communication with a ventilation groove having a plurality of air distribution channels penetrating to the backrest surface (front surface) formed in the seat back pad. It is in the state provided by being connected. Here, the ventilation groove 3Pa corresponds to the “ventilation path” of the present invention, the intake connection port 3Pd1 corresponds to the “fan connection port” of the present invention, the exhaust fan 11 corresponds to the “fan” of the present invention, Two ducts 13 correspond to the “duct” of the present invention.

  The above-described third duct 14 is formed in an accordion shape so that it can be freely bent and deformed in the front-rear direction and the width direction of the seat or can be expanded and contracted in the vertical direction. Due to the flexible structure, the movement when the backrest angle of the seat back 2 is changed can be freely released. Therefore, the connection between the second duct 13 and the third duct 14 described above allows the above-described exhaust fan 11 and the ventilation groove in the seat back pad (not shown) to communicate with each other through the ventilation groove 3Pa in the seat cushion pad 3P. The state is connected to the state. Accordingly, external air is also sucked from the backrest surface of the seat back 2 through the second duct 13 and the third duct 14 described above by the operation of the exhaust fan 11.

  Hereinafter, specific configurations of the seat cushion 3 and the intake device 10 described above will be described in more detail. As shown in FIG. 2, the seat cushion 3 is made of a cloth having excellent air permeability as a skin material, a steel seat cushion frame 3 </ b> F that forms an inner skeleton thereof, a foam cushion seat cushion pad 3 </ b> P that forms a cushion structure. Seat cushion cover 3C. The seat cushion frame 3 </ b> F is configured by being assembled into a square frame-like skeleton shape along the outer peripheral shape of the seat cushion 3. Specifically, the seat cushion frame 3F includes a pair of left and right side frames 3Fa made of steel plates that are long in the front-rear direction, and steel plates that are integrally stretched between the front end portions of the side frames 3Fa. The front panel 3Fb made of steel and the rear frame 3Fc made of a circular steel pipe inserted between the rear ends of the side frames 3Fa and rigidly coupled together.

  Four S springs 3Fs are hooked between the front panel 3Fb and the rear frame 3Fc. Each of these S springs 3Fs is formed in a wave-like shape in the sheet width direction, and is arranged in a state where four are arranged side by side in the sheet width direction in the region between both side frames 3Fa. Yes. These S springs 3Fs are elastic in a state in which the central part of a seat cushion pad 3P set on the upper part of a seat cushion frame 3F described later is close to the surface from the lower side by being bent in a wave shape in the seat width direction. It is the structure which supports it.

  The seat cushion pad 3P is formed by foam-molding a flexible polyurethane foam raw material. The seat cushion pad 3P is assembled to the upper part of the above-described seat cushion frame 3F, so that each frame portion (each side frame 3Fa, front panel 3Fb, rear frame 3Fc) of each seat cushion frame 3F and each above-described S spring 3Fs. By this, it is set in a state where it is supported in a state close to the surface from the lower side. Specifically, the seat cushion pad 3P is in a state of being firmly supported from below by the outer periphery supported by each frame portion of the seat cushion frame 3F described above and supported by each S spring 3Fs. In the central portion, these are elastically softly supported from below.

  Specifically, the seat cushion pad 3P described above is assembled and set so as to cover each frame portion of the seat cushion frame 3F from the seat outer peripheral side. Then, after the seat cushion pad 3P is assembled to the upper part of the seat cushion frame 3F, the seat cushion cover 3C is placed so that the entire surface (the seating surface and the front, rear, left and right side surfaces) is covered, Each peripheral edge portion of the cushion cover 3C is pulled and fixed to the bottom portion of the seat cushion frame 3F, so that the side frame 3Fa, the front panel 3Fb, and the rear of the seat cushion frame 3F are applied by the tension of the seat cushion cover 3C. Each frame 3Fc is firmly pressed against each other to be assembled and held.

  With the above assembly, the seat cushion pad 3P is configured such that the central buttocks support portion 3Pb that receives strong body pressure from the seat occupant's buttocks is appropriately softly received from below by the S springs 3Fs described above. The outer periphery of the seat cushion frame 3F is held in a state of being strongly and stably supported from below by the frame portions of the seat cushion frame 3F.

  Here, as shown in FIG. 5, the seat cushion pad 3 </ b> P described above has a seating surface of the thigh support portion 3 </ b> Pc in which the seating surface of the buttocks support portion 3 </ b> Pb that receives the buttocks of the seated passenger It is formed at a lower position. As a result, the seat occupant's buttocks can be received at a position lower than the thigh, so that the seated occupant can take a comfortable seating posture in which he can lean back. On the other hand, the butt support portion 3Pb of the seat cushion pad 3P is formed such that the back surface portion thereof is greatly bulged below the back surface portion of the above-described thigh support portion 3Pc. The thickness in the height direction for receiving the occupant's buttocks is thicker than the thigh support 3Pc. Accordingly, the seat cushion pad 3P has a configuration in which the position of the seating surface of the buttocks support portion 3Pb is set low, but the large seating pressure received from the buttocks of the seated occupant is widened by the large thickness of the buttocks support portion 3Pb. It is configured to be able to receive the buttocks softly by dispersing.

  Specifically, the back surface portion of the seat cushion pad 3P described above has a reverse mountain shape in which the pad thickness gradually decreases toward the front and rear sides with the back surface portion of the above-described buttocks support portion 3Pb as the apex P. It is formed in an inclined shape. Here, as shown in FIG. 3, the above-described seat cushion pad 3 </ b> P is in a state in which each air distribution path of the above-described ventilation groove 3 </ b> Pa is exposed to the outside due to the shape of the molding die during foam molding. It is set as the structure formed. Then, after the foam molding, the air ventilation groove 3Pa is provided with a non-breathable planar lid cover 3Pd adhered to the back surface of the seat cushion pad 3P so as to cover the ventilation groove 3Pa. The groove 3Pa is in a state formed so as to pass through the groove region on the back surface side of the seat cushion pad 3P covered by the lid cover 3Pd. Thus, the ventilation groove 3Pa is in a state formed in a shape extending in the in-plane direction in the lower layer region near the back surface portion of the seat cushion pad 3P.

  Specifically, the shape of the ventilation groove 3Pa opened to the back side by foam molding of the seat cushion pad 3P described above is a shape that opens across the apex P of the buttocks support portion 3Pb in the front-rear direction. By being covered with the lid cover 3Pd after molding, it is formed in a state of opening to the outside through the intake connection port 3Pd1 and the duct connection port 3Pd2 opened in the lid cover 3Pd. Yes. The intake connection port 3Pd1 formed in the lid cover 3Pd described above is formed so as to open in the back surface region in front of the vertex P described above of the seat cushion pad 3P. Further, the duct connection port 3Pd2 is formed so as to open in the back surface region on the rear side of the above-described vertex P of the seat cushion pad 3P.

  Further, as shown in FIG. 4, the seat cushion pad 3P described above has a rear portion 3Pe provided in contact with the rear frame 3Fc of the seat cushion frame 3F on the outer peripheral surface of the rear frame 3Fc formed in a circular tube shape. A hollow portion 3Pe1 is formed in a shape where the shape is partially cut out at the center portion in the sheet width direction of the bent rear portion 3Pe. Yes. This hollow portion 3Pe1 is also formed by the shape of the molding die at the time of foam molding of the seat cushion pad 3P, similarly to the above-described ventilation groove 3Pa, and at the center portion in the seat width direction of the rear portion 3Pe of the seat cushion pad 3P. In the height direction, the cross section is formed in a rectangular shape.

  As shown in FIG. 5, the above-described second duct 13 is provided in the hollow portion 3 Pe <b> 1 described above in the height direction. In this way, the second duct 13 is provided to be passed through the rear portion 3Pe of the seat cushion pad 3P, so that the second duct 13 does not pass through the region on the rear side of the rear portion 3Pe, and the rear of the seat. It is set as the state arrange | positioned in the compact state in which the overhang | projection to the side was suppressed. However, since the second duct 13 is provided through the rear portion 3Pe of the seat cushion pad 3P in this way, the second duct 13 is passed through the rear side of the rear frame 3Fc of the seat cushion frame 3F. It will be in the state and will be in the state arrange | positioned in the vicinity location which is easy to interfere with the rear frame 3Fc.

  Here, the above-described second duct 13 is connected at one end to a duct connection port 3Pd2 formed on the back surface portion (lid cover 3Pd) of the seat cushion pad 3P, and extends rearward and upward from there to the other end. Is connected to the lower end portion of the bellows-shaped third duct 14 guided from the seat back 2, and the structure strength is increased to support the third duct 14 having the bellows structure from the lower side. It is made of a flexible resin material. For this reason, when such a hard second duct 13 interferes with the rear frame 3Fc by an action such as vehicle vibration, an unpleasant tapping sound (interference sound) may be generated.

  Therefore, in order to avoid the direct interference between the second duct 13 and the rear frame 3Fc described above, a soft extension 3Ba made of a non-woven fabric is interposed therebetween. The extension 3Ba is provided by being extended from a planar back surface material 3B made of a nonwoven fabric provided in a state of being laminated integrally with the back surface of the seat cushion pad 3P. By using the extension 3Ba extending from the back surface material 3B as a buffer material for avoiding the interference, the interference sound can be suppressed without adding another component.

  Here, the back surface material 3B is integrally formed on the back surface portion of the seat cushion pad 3P by foaming the urethane resin in a state of being set in advance in the mold during foam molding of the seat cushion pad 3P. It is provided as a laminated state. The back surface material 3B is formed in a state in which the foamed resin material is impregnated and cured by the integral molding described above, and the back surface portion of the seat cushion pad 3P is more than the seat cushion pad 3P. It is provided as a state in which a hard back layer is formed. As shown in FIG. 3, the back surface material 3 </ b> B is provided over the entire back surface of the seat cushion pad 3 </ b> P. Accordingly, as shown in FIGS. 2 and 5, the back surface portion of the seat cushion pad 3P is supported in a state close to a line by each outer peripheral portion supported by each frame portion of the seat cushion frame 3F and each S spring 3Fs. Each of the central portions is hardened so that the force supported by them can be widely dispersed in the surface direction at the back surface portion.

  Further, as shown in FIG. 3, the above-described ventilation groove 3Pa formed in an opening shape on the back surface portion of the seat cushion pad 3P is also hardened by the integral molding of the back surface material 3B described above. It is in a state where it is formed in a shape that is not easily crushed even if it receives a seating pressure from a seated occupant. Note that the back material 3B has holes formed in portions that pass through the ventilation groove 3Pa, and does not block the shape of each hole that penetrates to the seating surface of the seat cushion pad 3P of the ventilation groove 3Pa. It is formed into a shape.

  As shown in FIGS. 3 and 5, the back surface material 3B described above is provided in a state where the back surface portion of the rear portion 3Pe wound around the rear frame 3Fc of the seat cushion pad 3P is integrally laminated. ing. Specifically, as shown in FIGS. 3 and 4, the back surface material 3B described above is formed in the formation region of the cavity 3Pe1 that is pierced in the height direction through the rear portion 3Pe of the seat cushion pad 3P described above. In particular, the extended portion is provided without being cut out, and a portion exposed in the hollow portion 3Pe1 is formed as an extended portion 3Ba.

  As described above, the extension 3Ba is not provided in a cantilevered manner by being partially overhanged or cut out from the back surface material 3B, and both sides thereof are continuous with other back material 3B portions. It is formed as an intermediate part connected to each other. Therefore, as shown in FIG. 5, the above-described extension 3Ba is always covered with the outer peripheral surface of the above-described rear frame 3Fc in such a manner that it is suspended by the other part of the back material 3B that is continuous on both sides thereof. Following the shape of the bent back surface portion of the rear portion 3Pe, it is held in a bent shape so as to be wound around the outer peripheral surface of the rear frame 3Fc. As a result, the extension 3Ba is provided in a state in which the extension 3Ba is always held in a fixed state between the rear frame 3Fc and the second duct 13 passed through the cavity 3Pe1. It is in a state.

  Next, the configuration of the intake device 10 will be described. As shown in FIG.2 and FIG.5, the air exhaust device 11 is straddle | crossing each S spring 3Fs of two center among the four S springs 3Fs hooked by the seat cushion frame 3F mentioned above, these lower parts. It is provided as a state fixed with screws. Specifically, as described above with reference to FIG. 5, the air exhaust device 11 is disposed in a region in front of the apex P of the back surface portion of the bottom support portion 3Pb where the pad thickness of the seat cushion pad 3P is the largest. As a state in which 11A is directed to the upper side of the seat, the first duct 12 is connected to the intake connection port 3Pd1 formed on the back surface portion (lid cover 3Pd) of the seat cushion pad 3P described above. . As described above, the intake connection port 3Pd1 is formed in the planar lid cover 3Pd provided by being bonded to the back surface portion of the seat cushion pad 3P, and the intake port 3Pd1 is formed on the bottom support portion 3Pb of the seat cushion pad 3P. An opening is formed in a region in front of the apex P of the back surface.

  As shown in FIG. 5, the second duct 13 is disposed in a region on the rear side of the apex P of the back surface portion of the bottom support portion 3Pb of the seat cushion pad 3P described above, and one end of the second duct 13 is seat cushion. A bellows-like third duct 14 is connected to a duct connection port 3Pd2 formed on the back surface portion (lid cover 3Pd) of the pad 3P, extends rearwardly and upwardly therefrom, and is guided from the seat back 2 at the other end. It is set as the state connected with the lower end part. In this way, the second duct 13 is connected to the duct connection port 3Pd2 formed in the back surface of the region behind the apex P of the seat cushion pad 3P, so that the space in the seat cushion pad 3P (the ventilation groove 3Pa) ), The second duct 13 is arranged without straddling the apex P in the front-rear direction by being connected to the exhaust fan 11 disposed in the region in front of the apex P. Yes.

  As a result, even if the buttocks support portion 3Pb of the seat cushion pad 3P receives a large seating load from the buttocks of the seated occupant and bends greatly downward, the second duct 13 is back of the seat cushion pad 3P. It is designed not to be subjected to an excessive load that is pushed and bent by the portion from above. Further, since the second duct 13 is not arranged so as to pass further below the apex P of the back surface portion of the bottom support portion 3Pb, the arrangement space in the seat height direction of the second duct 13 can be suppressed in a compact manner. be able to.

  Further, as in the present embodiment, since the intake port 11A of the exhaust fan 11 is arranged upward, the intake connection port 3Pd1 formed in the back surface portion (lid cover 3Pd) of the intake port 11A and the seat cushion pad 3P. When the second duct 13 is connected to the height region between the first duct 12 and the first duct 12, the installation height of the exhaust fan 11 must be lowered. The installation height of the exhaust fan 11 is established by connecting the duct connection port 3Pd2 formed on the back surface (lid cover 3Pd) and communicating with the exhaust fan 11 through the space (ventilation groove 3Pa) in the seat cushion pad 3P. Without lowering the height, the second duct 13 and the exhaust fan 11 can be arranged so as to overlap in the height direction, and the arrangement space in the height direction can be reduced in a compact manner.

  Thus, according to the configuration of the seat 1 of the present embodiment, the ventilation groove 3Pa is formed by extending the lower layer region close to the back surface portion of the seat cushion pad 3P in the in-plane direction, and the second duct. Since the duct connection port 3Pd2 connected to the opening 13 is formed in the back surface portion of the seat cushion pad 3P, the surface layer portion close to the seating surface of the seat cushion pad 3P is crushed by the load on which the occupant is seated. However, the ventilation groove 3Pa is not easily crushed. Thus, in the seat cushion pad 3P, the ventilation groove 3Pa connected to the second duct 13 guided to the seat back 2 can be formed so as not to be crushed with respect to the seating load. Further, the exhaust fan 11 and the second duct 13 are provided by connecting the exhaust fan 11 to an intake connection port 3Pd1 formed in a region in front of the peak P at the back surface of the seat cushion pad 3P. It is possible to obtain an optimal arrangement state in which they are distributed and arranged in separate areas before and after the peak P of the mountain.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, in each of the above embodiments, the automobile seat 1 is illustrated as an example of the vehicle seat of the present invention. However, the vehicle seat of the present invention can be used for various vehicles such as vehicles other than automobiles, railroads, airplanes, ships, and the like. The present invention can be applied to a seat used for a vehicle.

  Moreover, in the said Example, although the exhaust fan 11 which sucks in external air was illustrated as what is corresponded to the "fan" of this invention, it may replace with an exhaust fan and may be a blower which sends out air to a predetermined ventilation path. Good. Moreover, in the said Example, the duct (2nd duct) was provided by connecting with the duct connection port (duct connection port 3Pd2) formed in the back surface part of the rear part area | region of a seat cushion pad (seat cushion pad 3P). Although the configuration is exemplified, the duct may be provided so as to extend to the front region of the seat cushion pad and be connected to a duct connection port formed on the back surface portion of the front region. In addition, the seat cushion pad may have a flat shape in which the back surface portion does not swell in a mountain shape on the lower side. Further, a “fan” may be provided on the seat back, and a wind generated from the “fan” may be configured to pass through a duct formed in the seat cushion pad through a duct.

1 seat (vehicle seat)
2 Seat back 3 Seat cushion 3P Seat cushion pad 3Pa Ventilation groove (ventilation path)
3Pb butt support part 3Pc thigh support part 3Pd lid cover 3Pd1 intake connection port (fan connection port)
3Pd2 Duct connection port 3Pe Rear part 3Pe1 Cavity part 3B Back material 3Ba Extension part 3C Seat cushion cover 3F Seat cushion frame 3Fa Side frame 3Fb Front panel 3Fc Rear frame 3Fs S spring 4 Slide device 10 Intake device 11 Fan
11A Intake port 11B Exhaust port 12 First duct 13 Second duct (duct)
14 3rd duct P vertex

Claims (2)

A vehicle seat in which a ventilation path connected to a duct coming from a seat back is formed on a seat cushion pad,
The ventilation path is formed by extending a lower layer region close to the back surface portion of the seat cushion pad in the in-plane direction, and a duct connection port connected to the duct opens to the back surface portion of the seat cushion pad. Formed ,
The seat cushion pad has a back surface formed in a mountain shape in which the bulge to the lower side is the largest in the middle portion in the seat front-rear direction,
2. The vehicle seat according to claim 1, wherein the duct connection port is formed to open in a region on the rear side of the top of the mountain on the back surface portion of the seat cushion pad . The vehicle seat according to claim 1,
Furthermore, a fan is installed at the lower part of the seat cushion, and the fan is connected to a fan connection port that is formed in the back surface of the seat cushion pad and communicates with the ventilation path.
The fan connection port, said seat vehicle seat, characterized in that it is formed by an opening in the region of the front side side from the apex of a mountain on the back portion of the cushion pad.

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