JP2011225136A - Seat cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat cushion capable of properly holding the posture of an occupant when operating a pedal.SOLUTION: A pressure adjustment part 4 is provided between a first seat front part 2F1 in contact with an operating leg Lo of an occupant M and a second seat front part 2F2 in contact with a non-operating leg Ln. When the operating leg Lo presses the first seat front part 2F1, the contact pressure thereof is reduced, and the contact pressure between the non-operating leg Ln and the second seat front part 2F2 is increased. Accordingly, when operating the pedal, the action of the operating leg Lo is facilitated, and the non-operating leg Ln is firmly supported by the second seat front part 2F2.

Description

  The present invention relates to a seat cushion constituting a seat (seat) on which an occupant performing pedal operation is seated.

  As a seat provided with a seat cushion on which an occupant performing pedal operation is seated, for example, a driver's seat of an automobile is known. In order to suppress the contact pressure between the operating leg (right leg) and the seat cushion when the pedal is operated, there is known one in which a recess is formed in the right front portion of the seat cushion seat (for example, , See Patent Document 1).

Japanese Patent Laid-Open No. 11-28951 (page 3, FIG. 8)

  However, in such a conventional seat cushion, the hardness of the seat portion of the seat cushion is constant throughout the seat portion. For example, in a vehicle equipped with an automatic transmission, the left side of the seat portion where the non-operating leg (left leg) is located. It was too soft to take a standing posture while trying to hold the occupant's posture with the non-operating leg when the pedal was operated. For this reason, it has been difficult to properly maintain the posture of the occupant during pedal operation.

  Therefore, the present invention provides a seat cushion capable of properly maintaining the posture of an occupant during pedal operation.

  In the present invention, the front portion of the seat cushion on which the occupant performing the pedal operation sits, the first seat portion front portion where the operation leg on the pedal operation side is located, and the non-operation leg on the side where the pedal is not operated The second seat front portion is located, and when the operating leg presses the first seat front portion, the contact pressure between the operating leg and the first seat front portion is higher than the pressure before pressing. In addition, the contact pressure between the non-operating leg and the second seat front portion is configured to be higher than the pressure before pressing.

  According to the present invention, when the occupant operates the pedal with the operating leg, the contact pressure between the operating leg and the front portion of the first seat portion is reduced, so that the behavior of the operating leg is facilitated and the pedal operability is improved. . On the other hand, since the contact pressure between the non-operating leg and the second seat front portion increases, the non-operating leg can be firmly supported by the second seat front portion to ensure the posture retention of the occupant.

A state where an occupant is seated on a general seat cushion and a pedal is operated is shown. (A) is a schematic view of a state in which pressure is applied when a large occupant seated by increasing the lift angle of the seat cushion is seated. A side view and (b) are typical side views of a state in which pressure acts when a small occupant seated at a seat cushion with a lower lift angle is seated. It is a front view showing typically the state where the crew member sat down to the seat cushion concerning a 1st embodiment of the present invention. FIG. 3 is a schematic side view of a seat having the seat cushion shown in FIG. 2. FIG. 4 is a perspective view schematically showing the seat cushion shown in FIG. 3. (A) is the perspective view which takes out the pressure adjustment part shown in FIG. 4, and shows typically, (b) is a longitudinal cross-sectional view of (a). 2 shows the operation of the seat cushion shown in FIG. 2, (a) is a schematic front view seen from the front when the pedal is not operated, and (b) is a schematic front view seen from the front when the pedal is operated. . (A) is a perspective view which shows typically the state which incorporated the pressure adjustment part in the seat cushion concerning the 2nd Embodiment of this invention, (b) is an expanded sectional view of the pressure adjustment part of (a). It is a side view which shows typically the operating state of the seat cushion shown in FIG. (A) is a side view of a seat cushion schematically showing a state in which a pressure adjustment unit is incorporated in a seat cushion according to a third embodiment of the present invention, and (b) is an enlarged sectional view of (a). (A) is a side view schematically showing the operating state of the seat cushion shown in FIG. 9, and (b) is an enlarged cross-sectional view of the pressure adjusting part of (a). It is a side view which shows the state which incorporated the pressure adjustment part in the sheet | seat concerning the 4th Embodiment of this invention. It is a side view which shows the operating state of the seat cushion shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, a general sheet will be described with reference to FIG.

  As shown in a general automobile seat 1 in FIG. 1, the seat 1 mainly includes a seat cushion 2 on which an occupant M is seated and a seat back 3 on which the occupant M leans. The seat cushion 2 is generally mounted on a vehicle body floor with a vertical position adjusting mechanism, a front / rear position adjusting mechanism, and a front / rear angle adjusting mechanism, and the seat back 3 is mounted on the seat cushion by a reclining mechanism. Generally, the inclination angle with respect to 2 is adjustable.

  When the occupant M seated on the seat 1 steps on an accelerator pedal or a brake pedal (not shown), the right leg is usually the operating leg Lo and the left leg is the non-operating leg Ln. Further, as shown in FIG. 1 (a), when the large passenger Mb is seated, the seat cushion 2 is slid rearward and the front portion 2F is raised to tilt the seat cushion 2 obliquely upward and forward. Let Here, the lifting angle is θ. On the other hand, as shown in FIG. 1B, when the small occupant Ms is seated, the seat cushion 2 is slid forward and the lifting angle θ of the seat cushion 2 is reduced (for example, θ ≦ 16 degrees). ) And the front end of the seat cushion 2 is set to the low position.

  At this time, as shown in FIG. 1 (a), when the large occupant Mb operates the pedal, the upper surface of the front portion 2F of the seat cushion 2 is viewed from above on the back surface of the front portion of the thigh in the operating leg Lo. A pressure (see arrow) pushing downward acts. Further, as shown in FIG. 1B, when the small occupant Ms operates the pedal, the pressure (arrow) that presses the front surface of the front portion 2F of the seat cushion 2 with the back surface of the upper portion of the thigh portion of the operation leg Lo. See) will work.

[First embodiment]
2 to 6 show a first embodiment relating to a seat or a seat cushion according to the present invention, and an example will be described in the case where a seat on which an occupant performing a pedal operation is a driver's seat of an automobile.

  As shown in FIGS. 2 and 3, when an occupant M who performs a pedal operation is seated on the seat cushion 2 of the present embodiment, the front portion 2F of the seat cushion 2 includes a first seat front portion 2F1 and a second seat portion. A front part 2F2 pedal is provided. The operation leg Lo on the side where the pedal is operated is located in the seat front part 2F1, and the non-operation leg Ln on the side where the pedal is not operated is located in the second seat part front part 2F2.

  That is, in the front view of the seat cushion 2 shown in FIG. 2, the first seat front part 2F1 is located on the left half (vehicle right side), and the second seat part front part 2F2 is located on the right half (vehicle left side). Yes. Further, as shown in FIG. 3, when viewed in the side direction of the seat cushion 2, the longitudinal length “a” of the first seat front portion 2 </ b> F <b> 1 and the second seat front portion 2 </ b> F <b> 2 is the entire longitudinal length “b” of the seat cushion 2. On the other hand, it is preferable to set 1/6 to 1/8, that is, a≈b / 6 to b / 8. In other words, the seat cushion 2 is provided with a cushion portion c that can firmly support the body weight (lower buttocks) in the rear 5/6 to 7/8 with respect to the longitudinal length b. The longitudinal length b in this case is a length (for example, about 350 mm) that allows the small passenger Ms to sit firmly to the back of the seat cushion 2. The ratio of the first and second seat front portions 2F1 and 2F2 to the seat cushion 2 is the same in the second to fourth embodiments described below.

  Here, in this embodiment, when the operating leg Lo presses the first seat front part 2F1 at the boundary between the first seat front part 2F1 and the second seat front part 2F2, the operating leg Lo While decreasing the contact pressure with the 1st seat front part 2F1, the pressure adjustment part 4 which increases the contact pressure with the non-operation leg Ln and the 2nd seat front part 2F2 is provided. Thereby, the contact pressure between the operating leg Lo and the first seat front part 2F1 during the pedal operation is lower than the pressure before the pedal operation. Further, the contact pressure between the non-operating leg Ln and the second seat front part 2F2 during pedal operation is higher than the pressure before the pedal operation. When the pedal is operated, the contact pressure between the operating leg Lo and the first seat front part 2F1 is lower than the contact pressure between the non-operating leg Ln and the second seat front part 2F2.

  In addition, the said 1st seat front part 2F1 and the 2nd seat front part 2F2 are formed from the urethane raw material 5 containing the air which is a fluid. As shown in FIGS. 4 and 5, the pressure adjusting unit 4 is a plate-like member 45 disposed at a boundary portion between the first seat front part 2F1 and the second seat front part 2F2, The fluid (air) sealed in the seat front part 2F1 and the second seat front part 2F2 is communicated with each other via first and second communication parts 41 and 42 through which fluid can flow.

  When the operation leg Lo presses the first seat front part 2F1, the pressure adjusting unit 4 moves the fluid inside the first seat front part 2F1 to the inside of the second seat front part 2F2. ing. In this case, the fluid is air in this embodiment, but is not particularly limited to air, and may be a harmless gas or liquid other than air.

  As shown in FIGS. 5 (a) and 5 (b), the first and second communication portions 41 and 42 are vertically moved to a plate-like member 45 that partitions the first seat front portion 2F1 and the second seat front portion 2F2. The first communication part 41 is arranged on the upper side and the second communication part 42 is arranged on the lower side.

  Each communication part 41 and 42 is comprised by the communication port 41a, 42a formed in the plate-shaped member 45, and valve body 41b, 42b which opens and closes this communication port 41a, 42a. In this case, the valve bodies 41b and 42b are formed by a membrane valve, and the valve body 41b of the first communication part 41 located at the upper side in the drawing is disposed on the second seat front part 2F2 side, It is in close contact with the peripheral edge of the communication port 41a. The valve body 42b of the second communication portion 42 located below in FIG. 5 is disposed on the first seat front portion 2F1 side and can be in close contact with the peripheral edge portion of the communication port 42a. That is, the first communication part 41 functions as a check valve that allows only fluid movement from the first seat front part 2F1 to the second seat front part 2F2, and the second communication part 42 It functions as a check valve that allows only fluid movement from the seat front part 2F2 to the first seat front part 2F1.

  Therefore, according to the seat cushion 2 of the first embodiment, as shown in FIG. 6A, when the occupant M is seated in a normal state without performing a pedal operation, the front of the first seat portion Since the part 2F1 and the second seat front part 2F2 have almost no pressing force from above, the softness of the urethane material 5 results in a soft and soft cushion state.

  As shown in FIG. 6B, when the pedal is operated with the operating leg Lo, the upper surface of the first seat front part 2F1 is pressed downward on the back surface of the front part of the thigh of the operating leg Lo. Therefore, the fluid in the first seat front part 2F1 is pressurized and moves from the first communication part 41 into the second seat front part 2F2 (see arrow). At this time, the second communication portion 42 is in a closed state.

  Therefore, the contact pressure between the operating leg Lo and the first seat front part 2F1 is smaller than the pressure before the pedal operation, while the contact pressure between the non-operating leg Ln and the second seat front part 2F2 is before the pedal operation. Increases more than pressure. As a result, the operation leg Lo becomes easier to operate due to a decrease in the contact pressure with the first seat front part 2F2, and the pedal operability is improved. On the other hand, the non-operating leg Ln can firmly support the non-operating leg Ln by the second seat front part 2F2 and increase the posture retention of the occupant M by increasing the contact pressure with the second seat front part 2F2. .

  This facilitates the compatibility of the functions performed by the legs Lo and Ln when the pedal is operated, and as a result, the driving maneuverability can be improved.

  In addition, according to the seat cushion 2 of the present embodiment, by providing the pressure adjusting unit 4 having the above-described configuration, the first seat front part 2F1 and the second seat front part 2F2 can be configured with a simple structure. The pressure balance can be adjusted effectively.

  Note that when the pressing of the first seat front portion 2F1 by the operating leg Lo is released or the pressing force is reduced, the fluid in the second seat front portion 2F2 passes through the second communication portion 42 to the first seat. Since it returns to the front part 2F1, the contact pressure between the non-operating leg Ln and the second seat front part 2F2 decreases, and it tends to be in a normal soft support direction.

  Furthermore, according to the seat cushion 2 of the present embodiment, the urethane material 5 containing fluid (air) is filled in the first seat front part 2F1 and the second seat front part 2F2. Accordingly, it is easy to ensure appropriate cushioning properties of the first seat front part 2F1 and the second seat front part 2F2, and it is easier to adjust the pressure of the front part of the seat cushion 2 when the pedal is operated with the operating leg Lo. it can.

  In this case, it is preferable to set the hardness of the urethane material 5 to 1/4 to 1/2 of the bottom part of the seat cushion 2, and further to the front of the first seat corresponding to the operation leg Lo. It is preferable to make the hardness of the urethane material 5 of the part 2F1 softer by about 1/4 to 1/5 than the bottom part. By doing so, the tip portion of the first seat front portion 2F1 is depressed by the amount pressed by the back of the thigh, and the length of the first seat portion front portion 2F1 suitable for the physique of the small occupant Ms is easily obtained.

  The first seat front portion 2F1 and the second seat front portion 2F2 may be provided with a simple air bag inside without being filled with the urethane material 5, and may be liquid or gel-like substances. A fluid having a preferable hardness can also be used.

  By the way, in this embodiment, although the case where the 1st and 2nd 2 communication parts 41 and 42 were provided in the pressure adjustment part 4 was shown, a communication part is one communication part without a check valve function, That is, it can also be provided as a simple opening without a valve portion corresponding to the valve bodies 41b and 42b. In this case, it is preferable that the communication part without the check valve function can exhibit the orifice function by appropriately reducing the opening area.

[Second Embodiment]
7 and 8 show a second embodiment of the present invention. In describing this embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

  In the present embodiment, a pressure adjusting portion 4A having a valve body 42b to which a string-like traction member 61 is connected is provided in the second communication portion 42 shown in the first embodiment. The degree of opening of the valve element 42b is controlled in accordance with the lifting angle θ of the seat cushion 2.

  That is, as shown in FIGS. 7A and 7B, one end of the pulling member 61 is connected to the valve body 42b, and the other end is connected to the mounting structure portion 7 of the seat cushion 2.

  The mounting structure unit 7 is a portion that mounts the seat cushion 2 and moves back and forth, but is not interlocked with the rising or tilting of the seat cushion 2. For example, a pair of left and right seats are provided for one seat 1. A slide rail upper or a connecting portion for connecting the pair of slide rail uppers.

  As the lift angle θ of the seat cushion 2 increases, the valve body 42b is pulled by the pulling member 61 and operates in a direction to close the communication port 42a, thereby controlling the movement amount (passage amount) of the fluid. The length of the pulling member 61 is adjusted to a length that allows the communication port 42a to be completely closed when the lifting angle θ of the seat cushion 2 becomes larger than a predetermined angle.

  Therefore, the respective contact pressures between the first seat front part 2F1 and the operating leg Lo and between the second seat front part 2F2 and the non-operating leg Ln can be appropriately adjusted according to the situation. For example, when the vehicle is temporarily parked or stopped, when the driving is resumed by fully closing the valve body 42b, the first seat portion front portion 2F1 and the second seat portion front portion 2F2 again. The trouble of adjusting the pressure balance is eliminated.

  In particular, in the present embodiment, since the opening angle of the valve body 42b is controlled in accordance with the lifting angle θ of the seat cushion 2, the seat cushion 2 has a small lifting angle θ as shown in FIG. Since the valve body 42b is not pulled by the pulling member 61 when in the position, the second communication portion 42 functions in the same manner as in the first embodiment. On the other hand, as shown in FIG. 8, when the seat cushion 2 is at a high position with a large lifting angle θ, the valve body 42b is gradually pulled by the pulling member 61 according to the angle, and the opening of the communication port 42a If the area decreases and the lifting angle θ becomes larger than a predetermined angle, the communication port 42a is fully closed.

  That is, when the occupant M is small, adjustment of the contact pressure of the front portion 2F of the seat cushion 2 is not necessary, and the lift angle θ of the seat cushion 2 is small for the small occupant Ms. In this case, since the traction member 61 does not affect, the first and second communication portions 41 and 42 are provided in the front portion of the first seat portion by the original function of the valve bodies 41b and 42b (see the first embodiment). The pressure of the 2F1 and the second seat front part 2F2 can be adjusted.

  On the other hand, when the occupant M is large, the pressing force of the first seat front part 2F1 by the operating leg Lo is increased, and the lifting angle θ of the seat cushion 2 is increased. In this case, since the valve body 42b is pulled by the traction member 61, the amount of fluid passing through the second communication portion 42 is restricted, and furthermore, the lifting angle θ of the seat cushion 2 is larger than a predetermined angle. The passage of fluid is blocked. For this reason, since fluid movement from the second seat front part 2F2 to the first seat front part 2F1 is largely restricted, the contact pressure between the second seat front part 2F2 and the non-operating leg Ln can be maintained high, The posture retention of the large passenger Mb can be further improved.

[Third embodiment]
9 and 10 show a third embodiment of the present invention. In describing this embodiment, the same components as those in the second embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

  In the pressure adjusting unit 4B provided in this embodiment, instead of the traction member 61 shown in the second embodiment, as shown in FIG. 9, a cover plate 62 that covers the second communication part 42 is provided. It is configured.

  The cover plate 62 is provided so as to be relatively movable in the vertical direction so as to overlap the plate-like member 45, and the cover plate 62 has an opening 62 a having an opening area including the second communication portion 42. A shielding portion 62b having an area that can sufficiently cover the second communication portion 42 is provided adjacent to the upper side of the opening 62a. Then, the seat cushion 2 is in a substantially horizontal state (the lifting angle θ is small), the opening 62a is made to correspond to the second communication portion 42, and the lower end portion of the cover plate 62 is fixed to the mounting structure portion 7. is there. At this time, as in the second embodiment, the mounting structure portion 7 is a portion that mounts the seat cushion 2 and moves back and forth, but does not interlock with the rise or tilt of the seat cushion 2. .

  Therefore, according to the third embodiment, as shown in FIG. 9, when the lifting angle θ of the seat cushion 2 is small, the opening 62 a of the cover plate 62 is located at the second communication portion 42. The second communication portion 42 functions in the same manner as in the first embodiment.

  On the other hand, as shown in FIG. 10, when the lifting angle θ of the seat cushion 2 increases, the plate-like member 45 rises together with the seat cushion 2 with respect to the cover plate 62. Then, the second communication portion 42 is gradually detached from the opening portion 62a to reduce the opening area of the communication port 42a, and when the lifting angle θ is increased by a predetermined value or more, the second communication portion 42 becomes the shielding portion 62b. The communication port 42a is fully closed.

  Therefore, the same function as in the second embodiment can be exhibited when the small occupant Ms is seated and when the large occupant Mb is seated.

[Fourth Embodiment]
FIG. 11 and FIG. 12 show a fourth embodiment of the present invention, which, as shown in the second and third embodiments, increases the lifting angle θ of the seat cushion 2. The contact surface pressure between the non-operating leg Ln and the second seat front part 2F2 is further increased to further improve the posture retention of the large occupant Mb. In describing this embodiment, the same components as those in the second and third embodiments are denoted by the same reference numerals, and redundant description is omitted.

  That is, the pressure adjusting unit 4C of the present embodiment includes the bag body 81 having a sealed structure in the second seat front portion 2F2. The bag body 81 communicates with a fluid sealing portion 44 that encloses a fluid, and is configured by fixing a distal end portion 81a of the bag body 81 to the mounting structure portion 7 (see the first embodiment).

  At this time, as shown in FIG. 11, when the seat cushion 2 is at a low position with a small lifting angle θ, the bag body 81 is in a slack state where fluid can be accommodated. Also, as shown in FIG. 12, when the seat cushion 2 is in a high position with a large lifting angle θ, the front end of the cushion pan 9 disposed below the second fluid sealing portion 44 and the mounting structure portion 7 is set to be in tension.

  Therefore, according to the fourth embodiment, as shown in FIG. 11, when the small passenger Ms is seated and the lifting angle θ of the seat cushion 2 is small, the bag body 81 is in a slack state. Therefore, the fluid in the second fluid enclosing portion 44 can freely travel to and from the bag body 81. Thereby, the contact surface pressure between the second seat front part 2F2 and the non-operating leg Ln is substantially the same as that shown in the first to third embodiments.

  On the other hand, as shown in FIG. 12, when the large occupant Mb is seated and the lifting angle θ of the seat cushion 2 is increased, the bag body 81 is in a tension state, so the fluid in the bag body 81 is It flows into the second fluid enclosure 44 and is collected. Thereby, the pressure in the 2nd fluid enclosure part 44 becomes high, and the contact surface pressure of the non-operation leg Ln and the 2nd seat front part 2F2 is further increased, and the posture maintenance property of large passenger | crew Mb is improved more. be able to.

  By the way, although the seat cushion of the present invention has been described by taking the first to fourth embodiments as examples, various modifications can be made without departing from the gist of the present invention without being limited to these embodiments. For example, the pressure adjustment unit is not limited to the control of the fluid passage amount based on the lifting angle θ of the seat cushion 2, for example, in conjunction with a switch operated by the occupant M, an ignition switch, or a side brake. It may be activated. In addition, the seat cushion of the present embodiment has been described by taking an example of a driver's seat of an automobile, but other seats may be used as long as the seated occupant performs a pedal operation, for example, a passenger seat of a training vehicle. The present invention can also be applied to a seat cushion of a driver's seat such as an industrial vehicle.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 2F Front part of seat cushion 2F1 1st seat front part 2F2 2nd seat front part 4, 4A, 4B, 4C Pressure adjustment part 5 Urethane material M Crew Lo Operation leg Ln Non-operation leg θ Seat cushion Lifting angle

Claims (6)

An occupant who operates the pedal is seated, and a front part of the first seat part where the operating leg on the pedal operating side is positioned in the front part and a non-operating leg on the side where the pedal is not operated are positioned in the front part. A seat cushion having a second seat front portion,
When the operating leg presses the front part of the first seat,
The contact pressure between the operating leg and the first seat front portion is made lower than the pressure before pressing, and the contact pressure between the non-operating leg and the second seat front portion is made higher than the pressure before pressing. The seat cushion characterized by comprising in. Fluid is sealed inside the first seat front portion and the second seat front portion so that the fluid can flow between the first seat front portion and the second seat front portion. Let me communicate
When the operation leg presses the front part of the first seat part, by moving the fluid of the front part of the first seat part to the front part of the second seat part,
The seat cushion according to claim 1, wherein the contact pressure between the operating leg and the front portion of the first seat portion is decreased, and the contact pressure between the non-operating leg and the front portion of the second seat portion is increased.   The amount of movement of the fluid is controlled at a boundary portion between the first seat front portion and the second seat front portion to contact the operation legs at the first seat front portion and the second seat front portion. The seat cushion according to claim 2, further comprising a pressure adjusting unit that adjusts the pressure.   The seat cushion according to claim 3, wherein the pressure adjusting unit varies the amount of movement of the fluid in accordance with a lifting angle of the seat cushion.   5. The seat cushion according to claim 3, wherein the pressure adjusting unit reduces the amount of movement of the fluid when the lifting angle of the seat cushion is larger than a predetermined angle.   The said fluid is air, The said 1st seat front part and the said 2nd seat front part were formed from the urethane raw material which contains air inside, The any one of Claims 2-5 characterized by the above-mentioned. The listed seat cushion.

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