Seat cushion

Abstract

The present invention provides a seat cushion that prevents the front fixing part from detaching from the floor when the vehicle is struck head-on, without the seated occupant feeling any foreign object sensation. [Solution] The seat cushion 2 has a cushion frame 4 disposed inside the cushion pad 5, which includes a first wire 51, a second wire 52, and a third wire 53 that extend along the outer edge when viewed from above. The front fixing wire 20 and the rear fixing wire 10 of the cushion frame 4 are fixed to the floor F. The belt portion 71 of the belt member 7, which suppresses the stretching of the cushion pad 5 in the front-rear direction, is disposed along the back surface 5b of the cushion pad 5 for a dimension of at least half the front-rear length of the cushion pad 5. The plate 73 of the belt member 7 is indirectly fixed to the floor F, and the hook 72 is fixed to the eighth wire 58a of the cushion frame 4.

Description

Technical Field

[0001] The present invention relates to a seat cushion.

Background Art

[0002] Conventionally, some seat cushions for vehicle seats are formed by covering a cushion pad, which is a cushion body with a wire frame inserted therein, with a cushion cover that is a skin material. Such a seat cushion is suitably used in a bench-type rear seat, and is placed and fixed directly on the floor. In this type of seat cushion described in Patent Document 1, a wire is disposed to connect the front and rear floor fixing portions of the wire frame. This suppresses the cushion pad from extending forward under the forward load applied by a seated occupant during a frontal collision of the vehicle, and prevents the front fixing portion from coming off the floor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the seat cushion described in Patent Document 1, it is possible to suppress the cushion pad from extending forward and the front fixing portion from coming off the floor when the vehicle is involved in a frontal collision. However, the wire connecting the front and rear floor fixing portions is present under the seated portion of the occupant, which may cause the occupant to feel a foreign object sensation.

[0005] In view of such problems, an object of the present invention is to provide a seat cushion that can suppress the cushion pad from extending forward and the front fixing portion from coming off the floor during a frontal collision of the vehicle, without causing a seated occupant to feel a foreign object sensation. [Means for solving the problem]

[0006] The first invention of the present invention is a seat cushion in which a frame is disposed inside a pad body which is a cushioning material, the frame having a frame-shaped portion that extends along the outer edge when viewed from above, the front end and rear end of the frame are fixed to the floor, a strip-shaped fabric body that suppresses the stretching of the pad body in the front-rear direction is disposed along the back side of the pad body and extends substantially in the front-rear direction, the rear end of the fabric body is fixed directly or indirectly to the floor and the front end is fixed to a part of the frame.

[0007] According to the first invention, when an excessive forward force is applied to the seat cushion due to a vehicle collision, a strip-shaped fabric body is arranged along the back side of the pad body, extending substantially in the front-to-back direction to suppress the stretching of the pad body in the front-to-back direction. This reduces the force applied to the fixing point on the front end of the frame as the pad body stretches. As a result, the risk of the seat cushion detaching from the floor during a vehicle collision can be suppressed.

[0008] The second invention of the present invention is characterized in that, in the first invention described above, the fabric body is arranged over a dimension of 1 / 2 or more of the front-to-back length of the pad body.

[0009] According to the second invention, since the fabric body is arranged over a dimension of at least half the front-to-back length of the pad body, the force applied to the fixing point on the front end side of the frame by the stretching of the pad body can be sufficiently reduced. This effectively suppresses the risk of the seat cushion detaching from the floor during a frontal collision of the vehicle.

[0010] The third invention of the present invention is characterized in that, in the first invention described above, the fabric body is disposed in the area below the seated occupant's buttocks.

[0011] According to the third invention, since the fabric body is positioned under the seated occupant's buttocks, when an excessive forward force is applied to the seat cushion without the seated occupant feeling any foreign body sensation, the stretching of the pad body in the front-to-back direction can be effectively suppressed.

[0012] The fourth invention of the present invention is characterized in that, in the second or third invention described above, a forward projection is formed on the front end side of the frame, and the front end side of the frame is fixed to the floor by inserting the forward projection into a recess provided in the floor.

[0013] According to the fourth invention, the front end of the frame can be fixed to the floor with a simple structure.

[0014] The fifth invention of the present invention is characterized in that, in the second invention or the third invention described above, a rear projection is formed on the rear end side of the frame, and the rear end side of the fabric body is fixed to the floor together with the rear projection.

[0015] According to the fifth invention, the rear end of the frame and the rear end of the fabric body can be fixed to the floor with a simple structure. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view from diagonally above of a car rear seat equipped with a seat cushion according to one embodiment of the present invention. [Figure 2] This is a perspective view of the seat cushion in the above embodiment, seen from diagonally below. [Figure 3] This is a plan view of the seat cushion in the above embodiment, seen from above. Only the right side is shown. [Figure 4] This is a cross-sectional view taken along the line IV-IV in Figure 3. [Figure 5] This is a perspective view showing the portion of the seat cushion that is fixed to the floor at the rear end of the above embodiment. [Figure 6] It is a perspective view showing the fixing portion to the floor on the front end side of the seat cushion in the above embodiment. [Figure 7] It is a plan view of the mounting member as viewed from above. [Figure 8] It is a cross-sectional view taken along line VIII-VIII in Figure 7. [Figure 9] It is a plan view of the belt member. [Mode for Carrying Out the Invention]

[0017] Figures 1 to 9 show an embodiment of the present invention. This embodiment is an example in which the present invention is applied to a seat cushion 2 of a rear seat 1 for a motor vehicle. In each figure, arrows indicate respective directions when the vehicle rear seat 1 is mounted on a motor vehicle. In the following description, descriptions related to directions are based on these directions. The vehicle rear seat 1 of the present embodiment is a three-person bench seat, has a lateral length substantially equal to the width of the vehicle compartment, and includes the seat cushion 2 serving as a seating portion, and a seat back 3 serving as a backrest.

[0018] As shown in Figures 1 to 4, the seat cushion 2 is placed and fixed on a floor F constituting a part of the vehicle body of the motor vehicle. The seat cushion 2 includes a cushion frame 4 forming a skeleton, a cushion pad 5 as a cushion material, and a cushion cover 6 as a skin material. The seat cushion 2 has a pair of left and right seat portions 2A, and a central seat portion 2B disposed between the respective left and right seat portions 2A, and is formed in a bilaterally symmetrical shape. Here, the cushion frame 4 and the cushion pad 5 correspond to the "frame" and the "pad body" in the scope of the claims, respectively.

[0019] As shown in FIG. 3 and FIG. 4, the cushion frame 4 is formed mainly by combining bent wires and integrating them by welding. Specifically, the cushion frame 4 includes a first wire 51 extending along the inner side of the outer peripheral edge from the front side to the side portion of the cushion pad 5, a second wire 52 extending along the inner side of the outer peripheral edge at the left and right rear portions of the cushion pad 5, and a third wire 53 extending along the inner side of the outer peripheral edge at the left and right central portions of the cushion pad 5. The first wire 51, the second wire 52, and the third wire 53 are integrated by welding to form the "frame-shaped portion" in the claims. Further, the cushion frame 4 includes a fourth wire 54 extending along the inner side of the seat of the first wire 51, a fifth wire 55 extending along the inner side of the seat of the second wire 52, and a sixth wire 56 extending along the inner side of the seat of the third wire 53. In addition, the cushion frame 4 has a seventh wire 57 that connects the third wire 53 and the fourth wire 54 and extends in the front-rear direction. All the wires are integrated by welding. A first plate member 58 is attached by welding in a bridging manner between the side portion of the fourth wire 54 and the seventh wire 57. A second plate member 59 is attached by welding in a bridging manner between the side portion of the first wire 51 and the side portion of the fourth wire 54. Thereby, the cushion frame 4 is formed as a rigid body.

[0020] As shown in FIG. 3 to FIG. 5, a rear fixing wire 10 formed in a substantially U-shape is attached by welding to a substantially central portion in the left-right direction of the second wire 52 in the cushion frame 4, with the opening side of the U-shape facing forward. One rod-shaped portion on the U-shaped opening side of the rear fixing wire 10 is extended forward and fixed to the fifth wire 55 by welding. Here, the rear fixing wire 10 corresponds to the "rear protruding portion" in the claims.

[0021] As shown in Figures 3, 4, and 6, the front fixing wire 20 is attached by welding to the portion of the first wire 51 that is approximately in front of the rear fixing wire 10. The front fixing wire 20 has a roughly U-shaped locking portion 21 that opens upward when viewed from the front, a front connecting portion 22 at the top of the locking portion 21 where one rod-shaped portion extends diagonally forward from the U-shaped opening, and a rear connecting portion 23 at the top of the locking portion 21 where the other rod-shaped portion extends backward from the U-shaped opening. The front fixing wire 20 is attached to the cushion frame 4 by welding the front connecting portion 22 to the first wire 51 and welding the rear connecting portion 23 to the fourth wire 54. The locking portion 21 protrudes downward. Here, the locking portion 21 of the front fixing wire 20 corresponds to the "front protruding portion" in the claims.

[0022] As shown in Figures 4 and 6, a resin engaging member 30 is attached to the locking portion 21 of the front fixing wire 20. As shown in Figures 7 and 8, the engaging member 30 is cup-shaped with an opening generally facing upward, and has a lower cup portion 31 and a flange portion 32 disposed at the opening end, which is the upper part of the cup portion 31. Viewed from above, the outer shape of the cup portion 31 is set to be slightly smaller than the locking hole F1 formed in the floor F, so that it can be inserted into the locking hole F1 from above. Viewed from above, the outer shape of the flange portion 32 is set to be larger than the locking hole F1, so that when the cup portion 31 is inserted into the locking hole F1 from above, it abuts against the outer edge of the locking hole F1, making further insertion impossible. Inside the flange portion 32 and the cup portion 31, a receiving hole 33 is formed into which the locking portion 21 of the front fixing wire 20 can be inserted. A retaining member 35 is attached to the flange portion 32, which is rotatable horizontally around a pivot shaft 34 that extends vertically. When the retaining member 35 is rotated around the pivot shaft 34, the retaining portion 36 moves in and out of the receiving hole 33. With the locking portion 21 of the front fixing wire 20 inserted into the receiving hole 33, the retaining member 35 is rotated to insert the retaining portion 36 into the receiving hole 33, so that the retaining portion 36 is positioned within the U-shape of the locking portion 21, preventing the locking portion 21 from coming out of the receiving hole 33. This state is the state in which the locking portion 21 of the front fixing wire 20 is attached to the engaging member 30 attached to the locking hole F1 of the floor F. Here, the receiving hole 33 corresponds to the "recess" in the claims.

[0023] As shown in Figures 3 and 4, an eighth wire 58a extending in the left-right direction is provided at the rear end of the lower surface of the first plate member 58 in the cushion frame 4. The eighth wire 58a is for securing a hook 72 provided at the front end of the belt member 7, which will be described later.

[0024] As shown in Figures 2 to 4, the cushion pad 5 is integrally molded from urethane foam with the cushion frame 4 inserted. The urethane foam is a foam made of urethane resin, and its density is 0.04 g / cm³. 3The cushion pad 5 has an upper surface (front side 5a) and a lower surface (back side 5b). A urethane slab pad 5c is provided on the front side 5a of each left and right seat section 2A to provide comfortable support for the seated occupant.

[0025] As shown in Figures 2 to 4, a belt member 7 is provided on the back surface 5b of the cushion pad 5. As shown in Figure 9, the belt member 7 is formed by attaching a metal hook 72 to one end of a belt portion 71, which is a non-stretchable, strip-shaped fabric similar to a seat belt, and a resin plate 73 having a square hole 73a to the other end. The belt member 7 is positioned along the back surface 5b of the cushion pad 5 by passing the rear fixing wire 10 of the cushion pad 5, into which the cushion frame 4 is inserted, through the square hole 73a, and engaging the hook 72 with the eighth wire 58a. Here, the belt portion 71 corresponds to the "fabric" in the claims.

[0026] As shown in Figures 1, 2, and 4, the cushion cover 6 is formed in a bag-like shape with an opening at the bottom, by sewing together multiple pieces. The cushion cover 6 is placed over the cushion pad 5 to which the belt member 7 is attached from above, and the seat cushion 2 is formed by connecting multiple points on the front surface 5a and the outer edge of the back surface 5b.

[0027] The seat cushion 2 is attached to the floor F as follows. First, as shown in Figures 4 and 5, with the seat back 3 fixed to the floor F, the engaging claw portion 81, which is located at the bottom of the seat back frame 8 that forms the skeleton of the seat back 3, is positioned within the U-shape of the rear fixing wire 10 of the cushion frame 4. At this time, the plate 73 of the belt member 7 is positioned in front of the engaging claw portion 81 with the rear fixing wire 10 passed through the square hole 73a. This allows the seat cushion 2 to move forward until the portion of the rear fixing wire 10 opposite to the rear opening comes into contact with the engaging claw portion 81. After the portion of the rear fixing wire 10 opposite to the rear opening comes into contact with the engaging claw portion 81, the belt member 7 prevents the cushion pad 5 from extending forward. Next, with the engaging member 30 attached to the locking hole F1 of the floor F, the locking portion 21 of the front fixing wire 20 of the cushion frame 4 is inserted into the receiving hole 33 of the engaging member 30 and the retaining member 35 is rotated.

[0028] The embodiment configured as described above provides the following effects. When an excessive forward force is applied to the seat cushion 2 due to a frontal collision with a vehicle, the seat cushion 2 moves forward until the portion of the rear fixing wire 10 opposite to the rear opening contacts the engaging claw portion 81. After the portion of the rear fixing wire 10 opposite to the rear opening contacts the engaging claw portion 81, the belt portion 71 of the belt member 7 is arranged in the approximately front-to-back direction along the back surface 5b of the cushion pad 5 for a length of at least half the front-to-back length of the cushion pad 5. As a result, the cushion pad 5 stretches, reducing the force applied to the locking portion 21 of the front fixing wire 20. This is because the belt member 7 bears a portion of the force applied to the cushion pad 5. This reduces the risk of the seat cushion 2 detaching from the floor F during a frontal collision with a vehicle.

[0029] Furthermore, since the belt member 7 is made of the same chemically synthesized fiber material as a seat belt and is positioned under the seated occupant's buttocks, it can effectively suppress the stretching of the cushion pad 5 in the front-to-back direction when excessive forward force is applied to the seat cushion 2 without the seated occupant feeling any foreign object sensation. In addition, the front end of the seat cushion 2 is fixed to the floor F by inserting the locking portion 21 of the front fixing wire 20 into the receiving hole 33 of the engaging member 30 attached to the locking hole F1 of the floor F. This allows the front end of the seat cushion 2 to be fixed to the floor F with a simple structure. Moreover, the plate 73 of the belt member 7 is positioned so that the rear fixing wire 10 is passed through the square hole 73a and positioned in front of the engaging claw portion 81, with the engaging claw portion 81 positioned within the U-shape of the rear fixing wire 10. This allows the rear fixing wire 10 and the plate 73 of the belt member 7 to be fixed to the floor F with a simple structure.

[0030] Although specific embodiments have been described above, the present invention is not limited to their appearance and configuration, and various modifications, additions, and deletions are possible without altering the essence of the invention. For example, the following can be made.

[0031] 1. In the above embodiment, the present invention was applied to the seat cushion 2 of the rear seat 1 of an automobile. However, it can also be applied to the cushion pad of the front seat of an automobile.

[0032] 2. In the above embodiment, the rear fixing wire 10 is fixed to the floor F via the seat back frame 8, but the rear fixing wire 10 may be fixed directly to the floor F.

[0033] 3. In the above embodiment, the present invention was applied to an automobile seat, but it may also be applied to seats installed in airplanes, ships, trains, etc. [Explanation of Symbols]

[0034] 1. Rear seat for automobiles 2 seat cushions 3 Seatback 4. Cushion frame (frame) 5. Cushion pad (pad body) 7 Belt component 8 Seat back frame 10. Rear fixing wire (rear protrusion) 20 Front fixing wire 21 Locking part (front protruding part) 30 Engaging member 33 Receiving hole (recess) 51 First wire (frame-shaped part) 52 Second wire (frame-shaped part) 53 Third wire (frame-shaped part) 58 First plate member 58a No. 8 wire 71 Belt section (fabric part) 72 hooks 73 Plates F Floor F1 Locked hole

Claims

1. A seat cushion having a frame inside a pad body which is a cushioning material, the frame having a frame-shaped portion that extends along the outer edge when viewed from above, The front and rear ends of the frame are fixed to the floor. A strip-shaped piece of fabric is arranged along the back side of the pad body, extending in a substantially front-to-back direction to suppress the stretching of the pad body in the front-to-back direction. A seat cushion in which the rear end of the fabric body is fixed directly or indirectly to the floor, and the front end is fixed to a part of the frame.

2. In claim 1, The fabric body is a seat cushion that is arranged over a dimension of at least half the front-to-back length of the pad body.

3. In claim 1, The aforementioned fabric material is a seat cushion positioned beneath the seated occupant's buttocks.

4. In claim 2 or claim 3, The front end of the frame has a forward projection that protrudes downward, A seat cushion in which the front end of the frame is fixed to the floor by inserting the front protruding portion into a recess provided in the floor.

5. In claim 2 or claim 3, The rear end of the frame has a rearward projection that protrudes toward the rear. A seat cushion in which the rear end of the fabric body, along with the rear projection, is fixed to the floor.

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