JPH1053052A - Seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the space of an angle changable elevating mechanism by providing a third link with one end side rotatably fitted to the other end side of an oscillating link and with the other end side rotatably fitted to the floor side, and making the front side of a seat cushion rise less than the rear side. SOLUTION: One end side of a first link 15 is rotatably fitted to an upper rail 13 (floor side), and its intermediate part is rotatably fitted to the rear part of a lower arm 14. One end side of a third link 18 is rotatably fitted to the other end side of an oscillating link 17, and the other end side is rotatably fitted to the upper rail 13 (floor side). When the first link 15 or the third link 18 is rotated, the lower arm 14 (seat cushion) is elevated with such an angle that the front side of the lower arm 14 rises less than the rear side. Large space is generated among the first link 15, the oscillating link 17 and the third link 18 so as to be space-saving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat provided on a vehicle or the like and having a seat cushion movable in a vertical direction.

[0002]

2. Description of the Related Art Next, a conventional example will be described with reference to the drawings.
FIG. 19 is a configuration diagram illustrating an example of a conventional seat in which a seat cushion moves vertically.

In FIG. 1, reference numeral 1 denotes a seat slide mechanism comprising a lower rail 2 fixed to the floor side and an upper rail 3 slidably engaged with the lower rail 2.
Reference numeral 4 denotes a first lower arm connected to the frame of the seat cushion. 5 is a first link whose one end is rotatably attached to the rear of the upper rail 3 and the other end is rotatably attached to the rear of the first lower arm 4, and 6 is one end of the upper rail. 3 is rotatably mounted on the front of the first lower arm 4, and the other end is rotatably mounted on the front of the first lower arm 4, and the second link has a length substantially equal to that of the first link 5. is there.

A second lower arm 7 has a base end rotatably attached to the first lower arm 4 and is connected to a frame of a seat cushion. 8 has one end second
A third link rotatably attached to the front of the lower arm 7 and the other end rotatably attached to the front of the upper rail 3.

Next, the operation of the above configuration will be described. Upper rail 3, first lower arm 4, first link 5, and sixth link
Link 6 forms a parallel link. Therefore, when the first link 5 or the sixth link 6 is rotated, the first link 5 or the sixth link 6 is rotated.
The lower arm 4 moves up and down in parallel with the upper rail 3.

On the other hand, since the second lower arm 7 is connected to the upper rail 3 via the third link 8, FIG.
When the first lower arm 4 moves up from the state shown in FIG. 9, the amount of rise of the second lower arm 7 becomes smaller than the amount of rise of the first lower arm 4. Further, when the first lower arm 4 descends, the descending amount of the second lower arm 7 becomes larger than the descending amount of the first lower arm 4, that is, the angle of the seat cushion with respect to the floor changes. (Hereinafter, in the present specification, such a movement is referred to as a vertical movement with an angle change.)

In such a seat, when the seat is raised, the amount of elevation of the front portion of the seat cushion is reduced, so that the foot of the seat occupant is lower than when the seat cushion is raised in parallel. It is hard to separate.

[0008]

However, in the seat having the above structure, the lower arm is composed of the first lower arm 4 and the second lower arm 7 in order to raise and lower the seat cushion with an angle. Since the first link 5, the second link 6, and the third link 8 must be provided in the seat sliding direction, there is a problem that a large space is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a space-saving seat in which a mechanism for performing an elevation change with an angle change is used.

[0010]

FIG. 1 is a principle diagram for explaining the first aspect of the present invention. In the figure, reference numeral 11 denotes a lower rail 12 fixed to the floor side, and the lower rail 12
And an upper rail 13 slidably engaged with the seat slide mechanism.

Reference numeral 14 denotes a lower arm connected to the frame of the seat cushion. Reference numeral 15 denotes a first link whose one end is rotatably attached to the upper rail 13 (floor side), and whose intermediate portion is rotatably attached to the rear portion of the lower arm 14.

Reference numeral 16 denotes a second link whose one end is rotatably attached to the other end of the first link. 17 has a middle portion rotatably attached to a front portion of the lower arm 14 and a second link 16 at one end side.
Is an oscillating link rotatably mounted at the other end.

A third link 18 has one end rotatably attached to the other end of the swing link 17 and the other end rotatably attached to the upper rail 13 (floor side). It is.

Next, the operation of the above configuration will be described.
When the third link 18 or the third link 18 is rotated, the lower arm 14 (seat cushion) moves up and down with an angle such that the front side of the lower arm 14 (seat cushion) rises less than the rear side.

According to the above configuration, the first link 15
Since a large empty space is created between the swing link 17 and the third link 18, the space is saved, and it is easy to provide another mechanism in this empty space.

In FIG. 1, the first link 15 is provided at the rear portion of the lower arm 14, and the swing link 17 and the third link 18 are provided at the front portion of the lower arm 14. The first link 15 is attached to the front portion of the lower arm 14 by appropriately setting the shape of
A third link 18 can be provided at the rear of the lower arm 14.

According to a second aspect of the present invention, in the first aspect, a link is provided to at least one of the first link, the second link, the swing link, and the third link. Is provided with a lock mechanism for prohibiting the movement of the object.

By unlocking the lock mechanism,
The lower arm (seat cushion) can be moved up and down. By locking the lock mechanism, the lower arm (seat cushion) can maintain its height.

According to a third aspect of the present invention, in the first or second aspect of the present invention, an urging means for urging the lower arm upward is provided. The seated person lifts his / her waist from the seat cushion and unlocks the lock mechanism, whereby the lower arm (seat cushion) is raised by the urging force of the urging means. Then, when the lower arm (seat cushion) has been raised to a desired height, the lock mechanism is set in a locked state, whereby a desired height of the lower arm (seat cushion) can be obtained.

Further, when lowering the lower arm (seat cushion), the lower arm (seat cushion) is lowered by releasing the lock mechanism by the weight of the occupant. When the lower arm (seat cushion) is lowered to a desired height, the desired height of the lower arm (seat cushion) can be obtained by locking the lock mechanism.

Since the seat cushion is urged by the urging means, the operation becomes easy when the seat cushion is raised. The urging means includes, but is not limited to, a means manufactured from a material having elasticity such as metal or synthetic resin, and a means using liquid pressure or gas pressure such as oil.

[0022]

Embodiments of the present invention will now be described with reference to the drawings. First, the overall configuration of a seat according to the present embodiment will be described with reference to FIG. 2 illustrating a main part of the seat according to the embodiment of the present invention and FIG. 3 illustrating a back surface in FIG.

In this embodiment, the description will be made by using the main mechanism on one side. However, a similar mechanism is also provided on the other side, and the operating force to one side is transmitted using a transmission means. And transmitted to the mechanism on the other side.

In these figures, reference numeral 21 denotes a seat slide mechanism comprising a lower rail 22 fixed to the floor side and an upper rail 23 slidably engaged with the lower rail 22.

A lower arm 24 is provided to the upper rail 23 via a seat cushion angle elevating mechanism 25 and is attached to the seat cushion frame.
Is a ratchet plate provided on the lower arm 24 via the reclining mechanism 27 and attached to the upper arm attached to the seat back frame.

Next, the lower rail 2 of the seat slide mechanism will be described with reference to FIG.
2 and the cross-sectional shape of the upper rail 23 will be described. The lower rail 22 has a base portion 34 provided substantially parallel to the floor.
A first side wall 35 bent from one end of the base 34 and extending away from the floor; and a first side wall 35 bent from the other end of the base 34 and extending away from the floor. And a second side wall portion 36 having substantially the same length as the first side wall portion 35.
From the upper end of the first side wall portion 35, the first side portion is bent substantially parallel to the base portion 34 and extends in the direction of the second side wall portion 36.
From the upper end of the top portion 37 and the second side wall portion 36, is bent substantially parallel to the base portion 34, extends toward the first side wall portion 35, and is substantially the same as the first top portion 37. Second crown 38 of length
A first hanging portion 39 bent from the other end of the first top portion 37 toward the base portion 34 and shorter in length than the first side wall portion 35, and the other of the second top portion 38 Is bent in the direction of the base 34 from the end of the second hanging part 40 and faces the first hanging part 39 via the space S, and has a second hanging part 40 having substantially the same length as the first hanging part 39.
It consists of

On the other hand, the upper rail 23 is composed of a first upper rail 42 and a second upper rail 43. The first upper rail 42 includes a first base 44 inserted into the lower rail 22 through a space S formed between the first hanging part 39 and the second hanging part 40 of the lower rail 22,
A first extending portion 46 extending from the first base portion 44 and extending to a space S1 formed by the first side wall portion 35, the first top portion 37, and the first hanging portion 39 of the lower rail 22; Consists of

On the other hand, the second upper rail 43 has a second base 45 inserted into the lower rail 22 through a space S formed between the first hanging part 39 and the second hanging part 40 of the lower rail 22. And a second extension portion extending from the second base portion 45 and extending to a space S2 formed by the second side wall portion 36, the second top portion 38, and the second hanging portion 40 of the lower rail 22. 47.

Further, the first base 44 of the first upper rail 42 and the second base 45 of the second upper rail 43 are fixed and integrated. Next, the cutting line H- in FIG.
The locking mechanism of the seat slide mechanism 21 will be described with reference to FIGS.

The first hanging portion 39 of the lower rail 22, the second
A plurality of lock projections 41 are formed on one of the hanging portions 40 of the first rail 39 in this embodiment along the longitudinal direction of the lower rail 22.

In the upper rail 23, the first base 44 of the first upper rail 42 and the second upper rail 4
A space S3 is formed between the third base 45 and the third base 45 along the longitudinal direction of the upper rail 23.

In this space S3, a lock lever 50 is provided so as to be rotatable in the vertical direction by using a pin 49. The lower part of one end of the lock lever 50 is bent horizontally to form a lock hole 50 a that can be engaged with the lock projection 41. The upper part of one end of the lock lever 50 is bent in the horizontal direction, and the second upper rail 4
A projection 50b is formed to project outside through a first hole 43a formed in the third hole 3a. One end is locked by a pulling locking portion 42a formed by bending the upper portion of the first upper rail 42, and the other end is locked by a lock lever 50.
The lock lever 50 is urged in the direction in which the lock hole 50a engages with the lock protrusion 41 by the urging force of the spring 54 locked to the protrusion 50b.

The other end of the lock lever 50 has a first upper rail 42 formed on the first upper rail 42 of the upper rail 23.
And curling portions 50c, 50d protruding to the outside via the second holes 42b, 42c. And
A handlebar 51 that connects the lock levers of the outer and inner seat tracks is engaged with the curling portions 50c and 50d.

Then, as shown in FIG. 15, which is a cross-sectional view taken along the section line MM in FIG. 2, the first extension 37 of the first rail 37, the first side wall 35, and the first upper rail 42 of the lower rail 22. A steel ball 60 arranged between the protrusions 46,
A steel ball 61 disposed between the second top portion 38, the second side wall portion 36, and the second extension portion 47 of the second upper rail 43 of the lower rail 22, the base portion 34 of the lower rail 22, and the first upper rail The roller 6 disposed between the first extension portion 46 of the second and the second extension portion 47 of the second upper rail 43
2 and the upper rail 23 is a lower rail 22 without any backlash.
To slide against.

Next, the reclining mechanism 27 will be described with reference to FIG. 18, which is a view for explaining the reclining mechanism in FIG. 2, FIG. 3, FIG. 15, and FIG. Lower arm plates 71 and 72 are fixed to the lower arm 24 with the ratchet plate 26 interposed therebetween.

Numeral 73 denotes a hinge pin which penetrates the ratchet plate 26 and the lower arm plates 71 and 72 and rotatably supports the upper rail side (ratchet plate 26) with respect to the lower arm side (lower arm plates 71 and 72).

The lower portion of the upright wall surface of the concave portion 26a of the ratchet plate 26 has a cylindrical surface centered on the hinge pin 73, and has internal teeth 26b formed therein. Further, in the recess 26a of the ratchet plate 26, a pole 7 having external teeth 74a which can be meshed with the internal teeth 26b is formed.
4 are provided.

The lower arm plate 72 is formed with guides 72a, 72 formed by half blow processing or the like.
With b, the pawl 74 is guided in the radial direction of a circle centered on the hinge pin 73.

The recess 26 of the ratchet plate 26
On a, a cam 75 is provided rotatably on the hinge pin 73 and can press the back of the pawl 74. 7
Reference numeral 6 denotes a reclining handle rotatably attached to the hinge pin 73.

Long holes 72c and 76a are formed in the lower arm plate 72 and the reclining handle 76, and a pin 77 erected on a pole 74 is loosely fitted in the long holes 72c and 76a. 78 is a pin 77
Is a ring for retaining that is attached to the tip of the.
The elongated holes 72c and 76a are set in such a shape that the pawl 74 engages with and separates from the internal teeth 26b of the latch plate 26 when the reclining handle 76 rotates.

Further, the cam 75 has a bent portion 75b which engages with a hole (not shown) formed in the lower arm plate 72 and a hole 76b formed in the reclining handle 76.
As shown in FIG. 15, the hinge pin 73 is formed.
Is connected to a connecting pipe 79 connected to the hinge pin of the reclining mechanism on the other side.
Reference numeral 78 denotes a hook plate fixed to the connecting pipe 79, and a hole 71 formed in the lower arm plate 71.
a, and engages with a hole 75a formed in the cam 75,
The movement of the reclining handle 76 is transmitted to the connecting pipe 79.

A slit 73a is formed at the tip of the hinge pin 73, and the slit 73a has a first slot.
The outer end of the first spiral spring 81, to which the inner ends of the second spiral springs 81, 82 are locked, is locked to a stopper plate 80 fixed to the upper part of the ratchet plate 26, and the upper arm ( (Seat back) in the forward leaning direction. The outer end of the second spiral spring 82 has a reclining handle 76
, And urges the reclining handle 76 so that the reclining mechanism 27 is locked.

Next, a description will be given of the seat cushion angle-elevating mechanism 25 mainly with reference to FIG. 16 illustrating the seat cushion angle-elevating mechanism in FIG. In the figure, 1
Reference numeral 00 designates one end portion disposed in a space formed between the first and second upper rails 42 and 43 of the upper rail 23 (floor side), and rotatably mounted by using a pin 101. The first part is rotatably mounted on one side using a pin 102 at the rear of the lower arm 24.
(See FIG. 13 which is a cross-sectional view taken along section line KK in FIG. 2).

Reference numeral 103 denotes one end of the first link 10
0 is a second link rotatably attached to the other end side using a pin 104. 105 is disposed between the lower arms 24 on both sides, a middle portion is fixed to a connecting pipe 106 rotatably provided with respect to the lower arms 24 on both sides, and a second link 103 is provided on one end side.
Is an oscillating link rotatably mounted using a pin 107 at the other end.

Reference numeral 108 denotes one end of the swing link that is rotatably attached to the other end using a pin 109, and the other end of the swing link is rotated using a pin 110 on the upper rail 13 (floor side). A third link, possibly attached.

Therefore, the lower arm 24 is connected to the upper rail 23 by the first link 100 and the second link 10.
3, supported by a link mechanism including a swing link 105 and a third link 108.

Next, the configuration of the lock mechanism of the seat cushion angled elevating mechanism 25 will be described with reference to FIG. The first link 100 is formed with arc-shaped teeth 100 a around the pin 101.

A pin 111 is rotatably attached to a space formed between the first and second upper rails 42 and 43 on the upper rail 23 (floor side) by using a pin 112, and a tooth 100a of the first link 100. The lock member is formed with teeth 111a that are disengaged from the lock member. A lock member 113 is rotatably attached to the space formed between the first and second upper rails 42 and 43 on the upper rail 23 (floor side) using a pin 114, and is rotatably provided on the upper rail 23. A cam capable of pressing the back of the cam 111. In addition, the lock member 111 includes:
An engaging portion 111b with which the cam 113 can be engaged is formed, and when the cam 113 rotates clockwise in FIG.
It moves in a direction away from 00a.

Reference numeral 115 denotes a transmission lever rotatably attached to the pin 114 and having two rotating ends. A hole 115a is formed at one rotation end of the transmission lever 115. As shown in FIG. 13, the cam 113 has a bent portion 113a which is inserted through a hole 42d formed in the first upper rail 42 and is engaged with a hole 115a of the transmission lever 115.
Are formed.

The cam 11 is moved through the transmission lever 115 by a spring 116 whose one end is engaged with the upper rail 23 and the other end is engaged with the transmission lever 115.
Reference numeral 3 is urged in a direction to press the back of the lock member 111.

The connecting pipe 1 is connected to the pin 101.
The connecting pipe 120 is provided with an arm 121 having a groove 121a formed at the end thereof. The pin 122 provided at the other rotating end of the transmission lever 115 is inserted into the groove 121 of the arm 121.
a, the movement of the transmission lever 115 is controlled by the transmission lever of the brake mechanism of the seat cushion angled elevating mechanism on the other side.

Next, as shown in FIG. 10 which is a cross-sectional view taken along a cutting line GG in FIGS. 3 and 2, the lower arm 24 is provided with a bearing 131 for rotatably holding the shaft 130. A handle bracket 1 is attached to a spline portion 130a formed at one end of the shaft 130.
32 are attached. A lift handle 133 is rotatably attached to the shaft 130. The handle bracket 132 is formed with an upright wall 132a to which the lift handle 133 can abut.
A handle 136 is attached to the lift handle 133 using a screw 135.

140 is a tubular outer cable 14
0a and an inner cable 140b inserted through the outer cable 140a. The outer cable 140a at one end of the cable 140 is locked to the handle bracket 132, and the inner cable 14a is
Ob is locked to the lift handle 133.

The cable 140 is inserted through a hole 23a formed in the upper rail 23. As shown in FIG. 2, the outer cable 140a at the other end is engaged with a cut-and-raised portion 24a formed on the lower arm 24. The inner cable 140b is locked on the transmission lever 115. Therefore, when the lift handle 133 is operated and rotated, this rotational force is transmitted to the transmission lever 115 via the cable 140.

An oval hole 145a formed at one end of the link 145 is fitted into an oval portion 130b formed at the other end of the shaft 130. One end of the link 147 is rotatably attached to the other end of the link 145 using a pin 146. Link 14
7 is connected to the swinging link 10 using a pin 148.
5 (see also FIG. 9 which is a cross-sectional view taken along section line FF in FIG. 2).

Next, as shown in FIG. 2, FIG. 7 which is a cross-sectional view taken along the section line DD in FIG. 2, and FIG. 8 and FIG. 16 which are cross-sectional views taken along the section line EE in FIG. A bracket 150 having two grooves 150a and 150b is fixed, one end of which is locked in a hole 108a formed in the third link 108, engages with the groove 108b, and engages with the groove 150a of the bracket 150. And groove 1
The third link 108 is urged in a direction in which the third link 108 is raised, that is, in a direction in which the lower arm 24 (seat cushion) rises, by a torsion spring 151 as an urging means locked to 50b.

The seat cushion frame 162 of the seat of the present embodiment has a rear portion of the seat cushion frame 162 provided at a rear portion of the lower arm 24 as shown in FIG. It is rotatably attached to the bracket 160 using a pin 161, and the front portion is attached to the lower arm 24 via a seat cushion front elevation mechanism 170 which will be described below.

Next, in FIG. 2, FIG. 3, FIG. 4, and FIG.
The seat cushion front elevation mechanism 170 will be described with reference to FIG. 5 which is a cross-sectional view of FIG. 5B and FIG. 6 which is a cross-sectional view taken along a section line CC of FIG.

A connecting pipe 180 is rotatably mounted between the front parts of the lower arms on both sides. 1
Reference numeral 81 denotes a lift arm having an intermediate portion fixed to the connecting pipe 180. A plurality of teeth 181a are formed in an arc shape on one rotation end side of the lift arm 181. Further, one end of a link 183 is rotatably attached to the other rotating end of the lift arm 181 using a pin 182. A seat bracket 185 is rotatably attached to the other end of the link 183 using a pin 184. The seat bracket 185 is attached to the seat cushion frame 162.

Reference numeral 190 denotes a lock member rotatably attached to the lower arm 24 using a pin 191 and having a tooth 190a which can be engaged with and disengaged from a tooth 181a of the lift arm 181. A cam 192 is fixed to a shaft 193 rotatably provided on the lower arm 24 and can press the back of the lock member 190. The lock member 190 has an engagement portion 190b with which the cam 192 can be engaged. 194 has one end locked to the lower arm 24 and the other end locked to the cam 192, and connects the cam 192 to the locking member 1.
90 is a spring that urges the back portion 90 in the direction of pressing.

Further, a lift handle 195 is fixed to the shaft 193. 196 is pin 19
1 and a cover plate that engages with the shaft 193 and covers the lock member 190 and the cam 192.

The connecting pipe 180 has
Bracket 200 having two grooves 200a, 200b
Is fixed, one end is locked in the hole 24b of the lower arm 24, the hole 24c of the lower arm 24 is engaged, the groove 200a of the bracket 200 is engaged, and the torsion spring 201 is locked by the groove 200b. 2, the lift arm 181 fixed to the connecting pipe 180 is urged in the clockwise direction in FIG. 2, that is, the direction in which the seat bracket 185 (seat cushion) rises.

Next, the operation of the above configuration will be described. (1) Seat slide (see FIG. 17) In FIG. 7, when the handlebar 51 is lifted upward against the urging force of the spring 54, the lock lever 50 rotates clockwise about the pin 49, and the lock hole 50a The engagement between the lower rail 22 and the lock projection 41 is released, and the upper rail 23 is slidable with respect to the lower rail 22. When the upper rail 23 is moved to a desired position and the operating force on the handlebar 51 is released, the lock lever 50 is rotated counterclockwise by the urging force of the spring 54, and the lock hole 50a of the lock lever 50 is rotated.
And the lock projection 41 of the lower rail 22 are engaged, and the sliding of the upper rail 23 is prohibited.

Since the handle bar 51 is also connected to the lock lever 50 on the other side, the seat slide mechanism on the other side performs the same operation. (2) Reclining (see FIG. 18) When the reclining handle 76 is lifted upward (rotated counterclockwise in FIG. 18) against the urging force of the second spiral spring 82, the back of the pole 74 of the cam 75 Is released, the pawl 74 separates from the internal teeth 26b of the ratchet plate 26, and the ratchet plate 26 enters an "unlocked state" in which the ratchet plate 26 can rotate around the hinge pin 73.

When the desired reclining angle is obtained, the operating force on the reclining handle 76 is released, and the reclining handle 76 is rotated clockwise in FIG. 18 by the urging force of the second spiral spring 82. , The cam 75 presses the back of the pole 74,
The external teeth 74a of the pawl 74 move in a direction in which the external teeth 74a mesh with the internal teeth 26b of the ratchet plate 26, and enter a "locked state" where rotation of the ratchet plate 26 (seat back, upper arm) is prohibited.

The movement of the reclining handle 76 is, as shown in FIG.
8. It is also transmitted to the reclining mechanism on the other side via the connecting pipe 79. (3) Ascending and descending with a seat cushion angle In FIG. 3, when the occupant lifts his / her waist from the seat cushion and lifts (lifts counterclockwise) the lift handle 133, first, the inner cable 140b of the cable 140 is pulled, As shown in FIG. 16, the transmission lever 115 rotates clockwise against the urging force of the spring 116. The rotation of the transmission lever 115 causes the cam 113 to rotate.
Also rotates clockwise, and the cam 113
, The lock member 111 rotates counterclockwise, and the teeth 111a of the lock member 111 and the first
Of the link 100 with the tooth 100a is released.

Therefore, with respect to the upper rail 23, the first
Link 100, second link 103, swing link 105
The lower arm 24 supported via a link mechanism including the third link 108 is movable in the vertical direction.

When the lift handle 133 is further lifted, the lift handle 133 is
And the subsequent operating force acts in the direction of lifting the lower arm 24, and the lower arm 24
The (seat cushion) moves up and down with an angle such that the front side rises less than the rear side.

In the present embodiment, the lower arm 2
4 is biased upward by the biasing force of the torsion spring 151, so that the seat cushion can be raised with a small operating force.

When the lift has been performed to the desired height, the operating force on the lift handle 133 is released, and the teeth 111a of the lock member 111 are moved to the teeth 10 of the first link 100.
0a, the first link 100, the second link 1
03, the movement of the link mechanism including the swing link 105 and the third link 108 is prohibited.

The movement of the transmission lever 115 depends on the arm 1
21, transmitted to the transmission lever on the other side via the connecting pipe 120. Conversely, when lowering the position of the seat cushion, the lift handle 1
By operating 33, the locked state of the link mechanism is released, and the seat cushion descends at an angle due to the weight of the occupant. (4) Lifting and lowering the front of the seat cushion When the seated person is lifted from the seat cushion, the lift handle 195 is rotated counterclockwise in FIG.
Is rotated clockwise in FIG.
3, the lock member 190 rotates counterclockwise in FIG.
0a is disengaged from the teeth 181a of the lift arm 181 and the lift arm 181 is rotatable.

The seat bracket 185 is given a biasing force in the direction of raising the seat cushion by the biasing force of the torsion spring 201, so that the seat cushion is centered on the pin 161 (see FIG. 12) of the bracket 160. Move up. That is, only the front part of the seat cushion moves upward.

When the front portion of the seat cushion has moved to a desired height, the operating force on the lift handle 195 is released. Then, the teeth 190a of the lock member 190 mesh with the teeth 181a of the lift arm 181, and the elevation of the front portion of the seat cushion is prohibited.

Note that the other front side seat cushion elevating mechanism does not have a lock mechanism for inhibiting the rotation of the lift arm 181, and the lift arm 181 is moved via the connecting pipe 180 to which the lift arm 181 is fixed. Transmitted.

On the other hand, when lowering the position of the front portion of the seat cushion, the lift handle 195 is operated to release the locked state of the link mechanism as described above, so that the seat cushion is released due to the weight of the seated person. The front of
Descend. According to the above configuration, the first link 100,
Since a large empty space is created between the swing link 105 and the third link 108, the space is saved, and it is easy to provide another mechanism in this empty space.

The present invention is not limited to the above embodiment. In the above embodiment, the lock mechanism inhibits the rotation of the first link 100. However, the present invention is not limited to this. Alternatively, the second link 102
Alternatively, the rotation of the swing link 105 and the third link 108 may be prohibited.

[0077]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, the front side of the seat cushion is raised lower than the rear side, so that a large space is provided between the first link, the swing link, and the third link. Since a space is generated, the space is saved, and it is easy to provide another mechanism in the empty space.

According to the second aspect of the present invention, the first
In the invention of the first aspect, the first link, the second link,
At least one of the swing link and the third link is provided with a lock mechanism for inhibiting movement of the link. Therefore, by unlocking the lock mechanism, the lower arm (seat cushion) can be raised and lowered,
By locking the lock mechanism, the lower arm (seat cushion) can maintain its height.

According to the third aspect of the present invention, in the first or second aspect of the invention, when the urging means for urging the lower arm upward is provided, when the seat cushion is raised, It can be raised with a small operating force.

[Brief description of the drawings]

FIG. 1 is a principle diagram for explaining a first invention.

FIG. 2 is a diagram illustrating a main part of a sheet according to an embodiment of the present invention.

FIG. 3 is a rear view in FIG. 2;

FIG. 4 is a sectional view taken along section line AA in FIG. 2;

FIG. 5 is a sectional view taken along section line BB in FIG. 2;

FIG. 6 is a sectional view taken along section line CC of FIG. 2;

FIG. 7 is a sectional view taken along section line DD in FIG. 2;

FIG. 8 is a sectional view taken along section line EE in FIG. 2;

FIG. 9 is a sectional view taken along section line FF in FIG. 2;

FIG. 10 is a sectional view taken along section line GG in FIG. 2;

FIG. 11 is a sectional view taken along section line HH in FIG. 2;

FIG. 12 is a cross-sectional view taken along section line JJ in FIG. 2;

FIG. 13 is a sectional view taken along section line KK of FIG. 2;

FIG. 14 is a sectional view taken along section line LL in FIG. 2;

FIG. 15 is a sectional view taken along a cutting line MM in FIG. 2;

FIG. 16 is a diagram illustrating a seat cushion angled elevating mechanism in FIG. 2;

FIG. 17 is a diagram illustrating a seat slide mechanism in FIG. 2;

FIG. 18 is a diagram illustrating a reclining mechanism in FIG. 3;

FIG. 19 is a configuration diagram illustrating an example of a conventional seat in which a seat cushion moves vertically.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Seat slide mechanism 12 Lower rail 13 Upper rail 14 Lower arm 15 1st link 16 2nd link 17 Swing link 18 3rd link

Claims (3)

[Claims] 1. A seat in which a seat cushion is movable in a vertical direction, one end of which is rotatably attached to a floor, and an intermediate portion is rotated to one of a rear portion and a front portion of the seat cushion. A first link rotatably mounted, a second link rotatably mounted on one end side to the other end side of the first link, and an intermediate portion at a rear portion and a front portion of the seat cushion. Is rotatably attached to the other of the above, and the second end is attached to one end side.
A swinging link, the other end of which is rotatably mounted; a swinging link, one end of which is rotatably mounted to the other end of the swinging link, and the other end rotating to the floor. A third link movably mounted, wherein the front side of the seat cushion rises less than the rear side. 2. A method according to claim 1, wherein at least one of said first link, said second link, said swing link and said third link is provided with a lock mechanism for inhibiting link movement. The sheet according to claim 1, wherein 3. The seat according to claim 1, further comprising an urging means for urging the lower arm upward.