JP2004057239A - Seat structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat structure free from fears that a wrong operation is committed or the hand is caught, and having an enhanced safety. <P>SOLUTION: A seat 1 is equipped with a seat cushion 3 having armrests 4 on both side parts, and a seat back 5. For the seat 1, a rotation shaft member 10 at the lower part of the seat back 5 is longitudinally tiltably supported by a supporting member 14 at the rear part of the armrest 4. In the meantime, a fixed lever member 16 and a rotation lever member 15 are provided on the shaft member 10, and a fastening member 28 which can fasten the fixed lever member 16 is attached to the lever member 15. In addition, between the lever member 15 and the armrest 4, a locking member 19 is inserted, and the locking member 19 urges the seat back 5 in the erection direction F from the backward tilted direction B. At the same time, the locking member can lock the seat back 5 at a specified tilted location. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seat structure excellent in safety.
[0002]
[Prior art]
Conventionally, as a seat structure, a lower portion of a seat back is supported at a rear portion of the seat cushion so as to be able to tilt forward and backward, and between the seat cushion and the seat back, the seat back is urged from a backward tilt direction to a standing direction, and a predetermined A lock member (gas spring) lockable at the tilted position of the seat is interposed, and the locking between the lock member and the seat back is released by operating the locking member at the rear of the seat, and the seat back is seat cushioned. (See Japanese Patent Application Laid-Open No. 10-42989).
[0003]
[Problems to be solved by the invention]
However, in the above-described seat structure, since the locking member is exposed at the rear portion of the seat, there is a risk that the locking member may be unlocked by mistake and a hand may be caught in the locking member.
[0004]
The present invention has been made in order to solve the above-described problem, and has as its object to provide a seat structure excellent in safety without a risk of erroneous operation or pinching of a hand.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the present invention provides a seat cushion having armrests on both sides, and a seat including a seatback.
Inside the armrest, a rotating shaft member at a lower portion of the seat back is supported by a supporting member at a rear portion of the armrest so as to be able to tilt forward and backward, and the rotating shaft member is provided with a fixed lever member and a rotating lever member. A locking member capable of locking the fixed lever member is attached to the rotating lever member, and between the rotating lever member and the armrest, the seat back is urged from the backward tilt direction to the upright direction, Another object of the present invention is to provide a seat structure in which a lock member lockable at a predetermined tilt position is provided.
[0006]
According to the present invention, when the fixed lever member is locked by the locking member of the rotating lever member, the fixed lever member and the rotating lever member of the rotating shaft member of the seat back are connected in series. By unlocking the lock member, the seat back can be tilted backward by the back pressure of the occupant against the urging force of the lock member, and the seat back can be moved forward in the rising direction by the urging force of the lock member. On the other hand, when the locking member is released from the locking by the locking member, the connection between the fixing lever member of the rotating shaft member of the seat back, the rotating lever member and the lock member is released. As a result, the seat back can be manually moved forward on the seat cushion.
[0007]
Since the rotation shaft member of the seat back, the support member of the armrest, the fixed lever member, the rotation lever member, the locking member, and the locking member are all housed inside the armrest, the locking member is erroneously locked. There is no danger of performing the releasing operation, and there is no danger of the hand being caught in the locking member, so that safety is improved. In addition, since all parts such as the pivot shaft member of the seat back are housed inside the armrest, the appearance can be improved.
[0008]
According to the second aspect, when the first operation member for unlocking the locking member faces the outer lower portion of the armrest, it is difficult for the occupant to operate the first operation member in the seated state. Therefore, there is no possibility of erroneous operation.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
As shown in FIG. 1 (a), the seat 1 has a seat cushion 3 installed on a support 2a of a base plate 2, and armrests 4 rising in an arc shape are integrally formed on both sides of the seat cushion 3. It is provided in.
[0011]
A seat back 5 is disposed at a rear portion of the seat cushion 3, and a lower portion of the seat back 5 is moved up and down by a support mechanism (10, 14), which will be described later, between an upright position N and a backward tilt position B (see a two-dot chain line). , And is supported so as to be able to lean forward to a forward position F (see FIG. 1B).
[0012]
A mechanism unit 6 as shown in FIG. 2 is housed inside the right armrest 4 among the left and right armrests 4. In FIG. 1, the mechanism unit 6 is shown in a transparent manner in order to clarify the arrangement relationship of the mechanism unit 6 with respect to the armrest 4 and the seat back 5.
[0013]
As shown in FIGS. 2 to 4, a cylindrical rotating shaft member 10 protruding outward is provided at a lower portion of the seat back 5, and the base end of the rotating shaft member 10 is welded by welding a. The fixed bracket 11 is fixed to the side of the seat back 5 with bolts and nuts 12 (see FIG. 7A).
[0014]
The base of the pivot shaft member 10 is fitted to a bearing member (support member) 14 fixed to the inner frame 13 of the armrest 4, so that the seat back 5 is supported so as to be able to tilt forward (or backward). Will be. If such support mechanisms (10, 14) are also provided inside the left armrest 4, the support rigidity is improved because the seat back 5 is supported on both sides.
[0015]
The upper portion of both sides 15a of a U-shaped rotating lever member 15 (see FIG. 7B) is rotatably fitted to and supported by the rotating shaft member 10, and a flat fixed lever member. 16 (see FIG. 8A) is fitted and fixed by welding b.
[0016]
A shaft member 17 penetrates a lower portion of both side portions 15a of the rotating lever member 15, and an inner head portion 17a of the shaft member 17 is fixed to the outer side portion 15a by welding c.
[0017]
On the other hand, the lock member 19 has the same configuration as that of the above-mentioned conventional gas spring, and is composed of a cylinder 19a and a piston rod 19b which is extended and retracted in the cylinder 19a. When the valve member provided in the through hole of the piston is closed by partitioning the fluid therein, the piston rod 19b is locked so as not to move, and when the valve member is opened, the piston rod 19b is unlocked so that the piston rod 19b can move. Will be done. A button 19c for opening and closing the valve member from the outside is provided at the tip of the cylinder rod 19b, and the button 19c is urged in a protruding (valve closing) direction. In the cylinder 19a, an urging member for urging the piston rod 19b in the protruding direction is contracted.
[0018]
A U-shaped bracket 20 is attached to the distal end of the piston rod 19b, and the bracket 20 is rotatably supported on the inner frame 13 of the armrest 4 by a pin member 21. An unlocking plate 22 is pivotably mounted in the bracket 20 by a pin 22a. When the unlocking plate 22 is pivoted to the left L, the button 19c is pressed to open the valve member, and the right side is opened. When the swing R is performed, the pressing of the button 19c is released and the valve member is closed.
[0019]
A manually operated lever member (second operating member) 23 (see FIG. 1) is provided in a recessed portion 4a formed on the outer side of the right armrest 4 so as to be vertically rotatable. A cam portion 23b located in the armrest 4 is formed on the rotation shaft 23a, and the cam portion 23b and the unlock plate 22 are connected by a wire 24. When the hand operation lever member 23 is rotated upward, the wire 24 moves to the left via the cam portion 23b, the unlock plate 22 swings to the left L, and a hand is released from the hand operation lever member 23. When the button 19c is released, the unlock plate 22 is pivoted to the right by the urging force of the button 19c, the wire 24 moves to the right, and the manual operation lever member 23 is rotated downward (returned) via the cam portion 23b. become. The cam portion 23b is provided with a spring 23c for urging the hand-operated lever member 23 in the upward rotation direction. The spring 23c causes the unlock plate 22 to swing left L through the wire 24. This is for lightly contacting the button 19c without rattling, and there is no spring force to press the button 19c to open the valve member.
[0020]
A U-shaped bracket 25 is attached to the rear end of the cylinder 19a. The bracket 25 is rotatably supported by a shaft member 17 between both side portions 15a of the rotating lever member 15.
[0021]
A lock pin 27 penetrates inward at a lower portion of the fixed lever member 16, and a head 27 a outside the lock pin 27 is fixed to the fixed lever member 16 by welding d.
[0022]
A locking member 28 (see FIG. 8B) is rotatably supported on the shaft member 17 located inside the side portion 15a outside the rotating lever member 15. An arc groove 28a centering on the shaft member 17 is formed at a lower portion of the locking member 28, and a bent portion 15b formed at the lower end of the outer side portion 15a of the rotating lever member 15 is formed in the arc groove 28a. By fitting, the rotation range of the locking member 28 is regulated. A wire spring 29 (see FIG. 8C) is wound around the shaft member 17 located outside the outer side portion 15a of the rotating lever member 15, and a split pin 30 is attached to the outer end of the shaft member 17. To prevent the wire spring 29 from coming off.
[0023]
By locking one end 29a of the wire spring 29 to the outer side 15a of the rotating lever member 15 and locking the other end 29b to the locking member 28, the locking member 28 is fixed by the wire spring 29. It is urged in the right rotation direction (locking direction: see arrow e in FIG. 8B).
[0024]
In the upper part of the locking member 28, the locking pin 27 of the fixed lever member 16 is provided with a locking concave portion 15c formed on the outer side portion 15a of the rotating lever member 15 while being urged in the locking direction. A locking recess 28b is formed to be sandwiched and locked between them. Further, a hand operation cord member (first operation member) 31 is attached to a side portion of the locking member 28 through a small hole 28c (see FIG. 2). (See FIG. 1).
[0025]
The operation of the seat 1 configured as described above will be described.
[0026]
As shown in FIG. 5, when the seat back 5 is in the upright position N, the locking member 28 of the rotating lever member 15 rotates rightward by the urging force of the wire spring 29, and the locking recess of the locking member 28 is formed. In a state in which the lock pin 27 of the fixed lever member 16 is interposed and locked between the locking recess 15c of the rotating lever member 15 and the locking shaft 27, the rotating shaft member 10 and the fixed lever member 16 of the seat back 5 are rotated. The moving lever member 15 and the lock member 19 are in a state of being connected in series.
[0027]
In this state, when the occupant rotates the hand operation lever member 23 of the right armrest 4 upward, the wire 24 moves to the left via the cam portion 23b, and the unlock plate 22 swings to the left L, Since the valve member is opened (unlocked) by pressing the button 19c of the lock member 19, when the occupant applies back pressure to the seat back 5, the seat back 5 tilts backward while the piston rod 19b extends and moves. Become like
[0028]
Then, when the hand is released from the hand operation lever member 23 at an appropriate backward tilt position, the unlock plate 22 is pivoted to the right R by the urging force of the button 19c of the lock member 19, and the wire 24 moves to the right to move the cam portion. The manual operation lever member 23 is turned downward (returned) through the member 23b. Since the valve member is closed (locked) by releasing the pressing of the button 19c of the lock member 19, the piston rod 19b cannot be expanded or contracted, and the seat back 5 is locked at the inclined position thereafter.
[0029]
When the occupant lifts the back from the seat back 5 and rotates the hand-operated lever member 23 upward, the button 19c of the lock member 19 is pressed in the above-described order to open (unlock) the valve member. The seat back 5 is automatically tilted forward in the direction of the standing position N by the urging force of the urging member for urging the piston rod 19b in the projecting direction. When the hand is released from the hand-operated lever member 23 at an appropriate forward tilt position, the pressing of the button 19c of the lock member 19 is released in the above-described order, and the valve member is closed (operated). It is locked in the forward tilt position.
[0030]
On the other hand, when it is necessary to reduce the size of the seat 1 when moving or transporting, as shown in FIG. Is rotated left against the urging force of the wire spring 29, and the locking recess 28 b is separated from the locking recess 15 c of the rotating lever member 15. The lock is released. That is, the connection between the fixed lever member 16, the rotating lever member 15, and the lock member 19 is released.
[0031]
Thereby, when the seat back 5 is manually pushed in the forward direction, the seat back 5 is rotated in the forward direction together with the rotating shaft member 10 and the fixed lever member 16, and moves along the seat cushion 3. It becomes possible to lean forward to the forward leaning position F (see FIG. 1B).
[0032]
To return the seat back 5 to its original position after the movement or the like is completed, the seat back 5 is raised in the upright direction by hand, and the seat back 5 is rotated in the upright direction together with the rotating shaft member 10 and the fixed lever member 16. Then, while the lock pin 27 of the fixed lever member 16 pushes the locking member 28 to rotate to the left while being pinched between the locking concave portion 28b and the locking concave portion 15c, the rotation of the seat back 5 is performed. The shaft member 10, the fixed lever member 16, the rotating lever member 15 and the lock member 19 are in a state of being connected in series, and the seat back 5 is held at the standing position N.
[0033]
As described above, when the seat back 5 is moved forward or returned, the urging force of the lock member 19 does not act, so that the operation can be performed with a light force. It is safe because it does not use. Further, the user can be moved forward to the forward position F from any position between the standing position N and the backward inclined position B.
[0034]
In the seat 1, the pivot shaft member 10 of the seat back 5, the bearing member (support member) 14, the fixed lever member 16, the pivot lever member 15, the locking member 28, and the lock member 19 of the armrest 4 are all formed by the armrest 4 Since there is no danger that the locking member 28 will be unlocked by mistake, and there is no danger that the hand will be caught in the locking member 28, the safety will be improved. In addition, since all the components (10, 14 to 16, 19, 28) such as the rotating shaft member of the seat back 5 are housed inside the armrest 4, the appearance can be improved.
[0035]
Further, a hand operation string member (first operation member) 31 for unlocking the locking member 28 faces the outer lower part of the armrest 4 and a manual operation lever member (second operation member) for unlocking the lock member 19. The member) 23 faces the outside of the armrest 4, so that the seated person can extend the hand to the outside of the armrest 4 and operate the hand-operated lever member 23 in a seated state, so that the seatback 5 The rearwardly inclined position can be adjusted, and in this seated state, it is difficult to operate the hand operation cord member 31, so that there is no risk of erroneous operation.
[0036]
In addition, in each drawing, the hand operation cord member 31 is drawn so as to hang down from the lower portion of the armrest 4, but is normally pushed into the armrest 4 through a hole drilled in the lower portion of the armrest 4 and stored. In this respect, it is difficult to operate the hand operation cord member 31 from this point, so that there is no possibility of erroneous operation.
[0037]
In the seat 1 of the above embodiment, if the electric massage mechanism 33 (see FIG. 1) is housed in the central portion of the seat back 5, a seat for a massager can be obtained.
[0038]
【The invention's effect】
As is clear from the above description, the present invention provides that, when the fixed lever member is locked by the locking member of the rotating lever member, the fixed lever member and the rotating lever member of the rotating shaft member of the seat back. The seat back is tilted rearward by the back pressure of the occupant against the urging force of the lock member by unlocking the lock member, and the seat back is When the locking lever releases the locking of the fixed lever member by the locking member, the fixed lever member of the rotating shaft member of the seat back, the rotating lever member and the locking member are released. Is released, and the seat back can be tilted forward on the seat cushion by manual operation.
[0039]
Since the pivot shaft member of the seat back, the support member of the armrest, the fixed lever member, the pivot lever member, the locking member, and the locking member are all housed inside the armrest, the locking member is erroneously engaged. Since there is no danger of performing the stop release operation, and there is no danger of the hand being caught in the locking member, the safety is improved. In addition, since all parts such as the pivot shaft member of the seat back are housed inside the armrest, the appearance is improved.
[0040]
Further, since the first operating member for unlocking the locking member faces the outer lower part of the armrest (claim 2), the seated person is difficult to operate the first operating member in the seated state, so that the erroneous operation is performed. There is no danger.
[Brief description of the drawings]
FIG. 1A is a perspective view of a seat, in which FIG. 1A is a perspective view of a seat back in an upright position, and FIG.
FIG. 2 is a perspective view of a mechanism unit.
FIG. 3 is a longitudinal sectional view of a main part of the mechanism unit.
FIG. 4 is a cross-sectional view of a main part of the mechanism unit.
FIG. 5 is a side view of the mechanism unit with the seat back in an upright position.
FIG. 6 is a side view of the mechanism unit with the seat back in a forwardly-down position.
FIG. 7A is a side view of a rotating shaft member and a bracket, and FIG. 7B is a side view of a rotating lever member.
8A is a side view of a fixed lever member, FIG. 8B is a side view of a locking member, and FIG. 8C is a side view of a wire spring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat 3 Seat cushion 4 Armrest 5 Seatback 6 Mechanical unit 10 Rotating shaft member 14 Bearing member (support member)
15 Rotating lever member 16 Fixed lever member 19 Lock member 23 Manual operation lever member (second operation member)
28 locking member 31 hand operation cord member (first operation member)
B Back tilt position F Forward tilt position N Standing position

Claims (2)

In a seat including a seat cushion having armrests on both sides and a seatback,
Inside the armrest, a rotating shaft member at a lower portion of the seat back is supported by a supporting member at a rear portion of the armrest so as to be able to tilt forward and backward, and the rotating shaft member is provided with a fixed lever member and a rotating lever member. A locking member capable of locking the fixed lever member is attached to the rotating lever member, and between the rotating lever member and the armrest, the seat back is urged from the backward tilt direction to the upright direction, A seat structure in which a lock member lockable at a predetermined tilt position is interposed. The seat structure according to claim 1, wherein the first operation member for unlocking the locking member faces an outer lower portion of the armrest.

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