JP2003230453A - Locking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device lockable in multiple stages and having a self-retaining function with a small size. <P>SOLUTION: This locking device for energizing a supported member 13 by a repulsion imparting mechanism comprises a locked member 31 moved by the rocking of the supported member 13 and amplifying the relative movement of a support member and the supported member 13 to move an engagement part 31; a lock member 33 mounted on the engagement part 31 to be protrudable and retreatable, and locking the rocking of the supported member 13 when fitted to the engagement part 31; a first energizing means 32 for energizing the lock member 33 in the direction of engaging with the engagement part 31; a second energizing means 36 for energizing the lock member 33 in the direction of drawing out from the engagement part 31; and an operation means 35 switched between a lock position and unlock position, changing the energizing force to the lock member 33 by this switching, and keeping the energized state of the energizing means 34 and 36 connected thereto. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking device for swingably supporting a supported member with respect to a supporting member. More specifically, the present invention relates to a locking device capable of fixing tilt.

[0002]

2. Description of the Related Art There is a chair provided with a locking device having a lock mechanism that allows the seat and backrest of the chair to be rocked back and forth and can be fixed in a tilted state of the seat and backrest. For example, the locking device shown in FIG. 23 has a front seat frame 101 fixed to a leg, a rear seat frame 102 swingable with respect to the leg, and an anti-force that gives a force for returning the rear seat frame 102 to the original position. A lock mechanism 1 including a force applying mechanism (not shown) and a gas spring that can be fixed while the rear seat frame 102 is tilted.
07 (see Japanese Patent Laid-Open No. 4-193108). In this chair, the seat 103 and the backrest 105 can be locked by unlocking the lock mechanism 107. Then, by setting the lock mechanism 107 in the locked state, the seat 103 and the backrest 105 are locked while being inclined.

However, in this locking device,
When the lock mechanism 107 is in the unlocked state, the seat 10
Since the lock of 3 and the backrest 105 is surely released to enable locking, the lock mechanism 107 is unlocked when the seat 103 and the backrest 105 are tilted and locked and a person is not sitting. When operated, the reaction force of the reaction force application mechanism may cause the seat 103 and the backrest 105 to suddenly jump up.

To solve this, FIG. 24 and FIG.
As shown in, a locking device having a so-called self-holding function that holds the seat and backrest in an inclined state even when the seat and the backrest are tilted and locked and the seat is left unlocked Being developed (Japanese Patent Laid-Open No. 11-
276287). This locking device 200
Then, the seat plate 203 is swingably supported around the support shaft 202 with respect to the seat receiving member 201, and the reaction force imparting mechanism 204 biases the seat plate 203 toward the initial position. The seat plate 203 has a plurality of engagement grooves 2 arranged in the swing direction thereof.
A locked member 206 having 05 is attached. A lock member 2 that is slidable in the seat receiving member 201 in a direction that moves in and out of the engagement groove 205, and that locks the tilt of the seat plate 203 when fitted into the engagement groove 205.
07 is provided. Further, the seat receiving member 201 includes
A switching lever 208 is provided which is switched between a locked position and an unlocked position and is held at each position.

The movement of the switching lever 208 is transmitted to the locking member 207 between the switching lever 208 and the lock member 207, and the locking member 207 is elastically attached in the direction of withdrawing from the engagement groove 205. A biasing coil spring 209 and a transmission lever 210 are provided.

According to this locking device 200, the switching lever 208 is at the lock position and the lock member 207 is in the locked position.
When the lock member 207 is fitted into the engagement groove 205 of the locked member 206, the seat receiving member 201 to which the lock member 207 is attached is attached.
Since the lock member 207 is present across the engaging groove 205 and the engaging groove 205, the tilting of the seat plate 203 is locked. Here, the seat plate 203 is urged so as to receive a large reaction force of the reaction force applying mechanism 204 and return to the initial position. Therefore, the inner wall of the engagement groove 205 of the locked member 206 and the lock member 2
07 are pressed against each other, the switching lever 208 is operated to the unlock position so that the lock member 207 is engaged with the engaging groove 2.
Even if the lock member 207 is tried to be pulled out from 05, it cannot move due to a large friction with the inner wall of the engagement groove 205. Therefore, the tilt lock of the seat plate 203 is maintained and the torsion coil spring 209 is stored at the same time. As a result, the inclined state of the seat plate 203 is self-maintained.

[0007]

However, in the above-described locking device 200 having a self-holding function, the locked member 206 attached to the seat receiving member 201 has a plurality of members arranged in the swinging direction of the seat receiving member 201. Engagement groove 2
Since No. 05 is formed, the structure becomes thick in the vertical direction. Therefore, the locking device 200 is upsized, and the chair on which the locking device 200 is mounted is also upsized.

Further, since the locked member 206 is fixed to the seat plate 203, it can be moved only by the same amount as the swing amount of the seat plate 203. Therefore, the locked member 20
Since the movement width of 6 is small, the number of engagement grooves 205 cannot be increased, and the number of steps that can lock the seat plate 203 becomes insufficient.

Therefore, an object of the present invention is to provide a locking device that can be locked in many stages and is small in size, and yet has a self-holding function.

[0010]

In order to achieve the above object, the invention according to claim 1 supports a supported member swingably with respect to a supporting member, and at the same time, supports the supported member by a reaction force applying mechanism. In a locking device that urges toward a position, the locking device has a plurality of engaging portions, is attached to a supporting member and a supported member, and is moved by swinging of the supported member,
In addition, a locked member that amplifies the relative movement amount of the support member and the supported member to move the engaging portion, and a lock member that is attached to either the supporting member or the supported member so that the engaging portion can move in and out A lock member that locks the swing of the supported member at a position desired by the user when fitted into the joint portion, a first urging means that urges the lock member in a direction to engage the engaging portion, and a lock member. Is connected to the lock member via the second urging means for urging the lever in the direction of pulling out from the engaging portion and the first urging means or the second urging means, and is switched between the lock position and the unlock position. The switching means changes the urging force applied to the lock member, and the operating means is capable of maintaining the urging force applied to the connected urging means.

Therefore, when the operating means is in the lock position and the lock member is fitted in the engaging portion of the locked member, the lock member extends over the supporting member to which the lock member is attached or the supported member and the engaging portion. Therefore, the swing of the supported member is locked. In this state, if no external force is applied to the supported member or only a slight external force is applied, the supported member receives the large reaction force of the reaction force applying mechanism and is urged to return to the initial position. Has been done. Here, since the inner wall of the engaging portion of the locked member and the locking member are pressed against each other, the operating member is operated to the unlock position and the locking member is pulled out of the engaging portion by the urging force of the second urging member. Even if it tries to come out, the lock member cannot move due to a large friction with the inner wall of the engaging portion. Therefore, the rocking lock of the supported member is maintained, and at the same time, the second urging unit stores energy. As a result, the tilted state of the supported member is self-maintained.

When an external force that weakens the reaction force by the reaction force application mechanism is applied to the self-supported member to be supported, the pressing force between the inner wall of the engaging portion and the lock member is reduced and the friction is reduced. The power weakens. Further, when the total amount of the frictional force and the urging force of the first urging means becomes smaller than the urging force of the second urging means in the pull-out direction of the lock member, the lock member moves to the second urging means. Is pulled out from the engaging portion by. As a result, the locked state by the lock member and the engaging portion is released, and the supported member is unlocked and can swing, so that the supported member returns to the initial position by the urging of the reaction force applying mechanism.

Here, since the locked member amplifies the relative movement amount of the support member and the supported member to move the engaging portion, it is possible to increase the number of lockable steps of the supported member. Further, since the moving direction of the locked member can be set differently from the swinging direction of the supported member, the locked member is moved in a direction with a spatial margin according to the shapes of the supporting member and the supported member. In this way, the locking device can be downsized.

The invention of claim 2 is the same as claim 1.
In the locking device described, the operating means is connected to the second biasing means and can be held in the unlocked position. Further, the invention according to claim 3 is the locking device according to claim 1, wherein the operating means is connected to the first biasing means and can be held in the locked position. Therefore, it is selected whether the operating means can be held only in the unlocked position, only in the locked position, or in both positions, and the locking device of the locking device can be held. It is possible to form an operation means having preferable operability according to the type.

According to a fourth aspect of the present invention, in the locking device according to any one of the first to third aspects, the locked member is swingable in a horizontal plane, and the engaging portion rotates the locked member. It is arranged on a circumferential surface centered on the center. Therefore, the vertical thickness of the locking device can be reduced. Therefore, this locking device can be built in, for example, a seat of a chair.

Further, the invention according to claim 5 is the same as claim 1.
In the locking device according to any one of 1 to 4,
The first biasing means and the second biasing means are tension coil springs having the same spring constant. Therefore, parts of the first biasing means and the second biasing means can be shared.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of the present invention will be described below in detail based on an example of an embodiment shown in the drawings. As shown in FIGS. 1 to 4, the locking device 11 of the present embodiment is
The back support rod 3 and the seat 4 which are supported members are swingably supported on the seat receiving member 2 which is a support member, and the back support rod 3 is supported.
The seat 4 is biased toward the original position by the reaction force applying mechanism 5. The reaction force applying mechanism is an urging spring 5 composed of a compression coil spring.

In this locking device 11, the seat 4 and the backrest 10 are tilted even if the seat 4 and the backrest 10 are tilted and the lock is released at a position desired by the user and the lock is released when the user stands up. It has a so-called self-holding function that can be held as it is. This locking device 11 is shown in FIG.
As shown in FIG. 10, a locked member 32 having a plurality of engaging portions 31 and attached to the seat receiving member 2 and the seat 4 (the seat frame 13), and the seat frame 13 or the seat receiving member 2 is attached. The lock member 33 that locks the swing of the seat frame 13 when fitted into the engaging portion 31, the first urging means 34 that urges the lock member 33 in the direction of engaging the engaging portion 31, and the lock member. It is provided with a second urging means 36 for urging 33 in the direction of withdrawing from the engaging portion 31, and an operating means 35 that can be switched between a locked position and an unlocked position.

The locked member 32 is a link (hereinafter referred to as a locked link). Locked link 32
Moves by swinging the seat 4 and the back support rod 3, and
The relative movement amount between the seat receiving member 2 and the seat 4 is amplified to increase the engagement portion 31.
To move. In the present embodiment, the locked link 32 has a fan shape as a whole, a first mounting pin 37 provided near the center angle, and a second mounting pin 38 provided closer to the center than the first mounting pin 37. A flange portion 39 having a circumferential surface centered on the second mounting pin 38 and an engaging portion 31 formed of a through hole arranged in the flange portion 39 along the circumferential direction are provided. The second mounting pin 38 is rotatably mounted on the seat frame 13 in a horizontal plane. The first mounting pin 37 and the tip of the seat receiving member 2 are connected by a connecting link 40. Therefore, when the seat frame 13 swings, the relative positions of the first mounting pin 37 and the second mounting pin 38 change, so that the locked link 32 rotates.

The second mounting pin 38 and the engaging portion 31 are arranged so that the distance between them is larger than the distance between the pins 37 and 38. Therefore, the relative movement amount of the seat frame 13 and the seat receiving member 2 is amplified and the engaging portion 31 is moved. Therefore, unlike the prior art, when the locked member is directly attached to the seat 4 and the like, a large number of engaging portions cannot be provided, whereas according to the present embodiment, the seat 4 and the backrest 10 are provided.
You can increase the number of lockable steps in. For example, in the chair 8 of this embodiment, the seat frame 13 moves back and forth by 30 m.
Since it is about m, even if a locked member is directly attached to this, the locking point is provided only in a few steps, but since the locked link 32 amplifies the movement, for example, 5
Stage lock points can be provided. Moreover, since a sufficient margin can be provided between the engaging portions 31, a robust structure can be obtained.

The locked link 32 is provided so as to swing in a horizontal plane. Therefore, the thickness of the locking device 11 in the vertical direction can be reduced, and the locking device 11 can be built in without increasing the thickness of the seat 4. That is, since the rocking direction of the locked link 32 can be separated from the rocking direction of the seat 4, the seat receiving member 2
It is possible to reduce the size of the locking device 11 by moving the locked link 32 in a direction with a spatial margin according to the shape of the seat 4.

In the present embodiment, the locked link 3
2 are provided on the left and right. Left and right locked links 32
Theoretically move symmetrically, so that the engaging portions 31 face each other and the lock member 33 penetrates. However, when there is a risk that the left and right locked links 32 may be displaced due to dimensional error or the like, gears that mesh with each other may be provided in each locked link 32 so that the operations are completely the same.

The lock member 33 is slidably attached to the guide tube 41 of the seat frame 13 so as to be able to move in and out of the engaging portion 31. Then, when the lock member 33 is fitted into the engaging portion 31, the seat 4 and the backrest 1
A tilt of 0 can be locked. This is because the seat frame 13 and the seat receiving member 2 form a fixed chain by the lock member 33 and the locked link 32. In addition, in the present embodiment, the lock member 33 includes the engaging portion 31.
Although it is mounted so as to slide in and out by sliding, the present invention is not limited to this, and may be set in and out by rotation, for example.

The operating means 35 is connected to the lock member 33 via the second urging means 36, and changes the urging force to the lock member 33 by switching between the lock position and the unlock position. Further, the operating means 35 is composed of, for example, a lever mechanism and can be maintained in a state in which the second biasing means 36 is biased, that is, in the unlocked position.
Here, the first biasing means 34 and the second biasing means 36 are tension coil springs having the same spring constant. Therefore, the components of the first biasing means 34 and the second biasing means 36 can be shared.

Further, a link 42 is connected between the base end of the lock member 33 and the seat frame 13. Then, the lock member 33 is provided so as to appear in and out of the engagement portion 31 as the link 42 swings. Further, the first urging means 34 is attached between the link 42 and the seat frame 13, and urges the lock member 33 in the direction in which it is recessed into the engaging portion 31. A second urging means 36 is attached between the link 42 and the operating means 35. Here, the fulcrum 42a and the action point 42b of the link 42
Since there is a force point 42c between the lock member 33 and the lock member 33 (see FIG. 7), the lock member 33 can be slid by amplifying the movements of the first biasing means 34 and the second biasing means 36.

Therefore, as shown in FIG. 7, the operating means 3
5 is in the lock position and the lock member 33 is fitted in the engaging portion 31 of the locked link 32, the seat frame 13
Since the lock member 33 is present across the guide cylinder 41 and the engaging portion 31, the tilting of the seat 4 and the backrest 10 is locked. In this state, if no external force is applied to the seat 4 and the backrest 10 or only a slight external force is applied, the seat frame 13 receives the large reaction force of the biasing spring 5 and returns to the initial position. Is urged by. Here, the inner wall of the engaging portion 31 of the locked link 32 and the lock member 33
Since they are pressed against each other, as shown in FIG.
Even if the lock member 33 is pulled out from the engagement portion 31 by operating the lock member 5 to the unlock position,
It cannot move due to the large friction with the inner wall of 1. Therefore, the tilting lock of the seat 4 and the backrest 10 is maintained, and at the same time, the second urging means 36 is energized. As a result, the tilted states of the seat 4 and the backrest 10 are self-maintained.

When an external force is applied to the seat 4 and the backrest 10 in the self-holding state to the extent that the reaction force by the biasing spring 5 is weakened, a pressing force is applied between the inner wall of the engaging portion 31 and the lock member 33. Becomes smaller and the frictional force weakens. Further, the total amount of this frictional force and the urging force of the first urging means 34 is equal to the second amount.
When the biasing force of the lock member 33 becomes smaller than the biasing force of the lock member 33 in the pull-out direction, the lock member 33 is pulled out from the engaging portion 31 by the second biasing device 36, as shown in FIG. At this time, the lock member 33 is held by the first urging means 34 and the second urging means 36 in a balanced manner so as not to move. Then, the locked state by the lock member 33 and the engaging portion 31 is released, and the seat frame 1
Since 3 becomes unlocked and can swing, the seat 4 and the backrest 10 are returned to the initial position by the urging of the urging spring 5, or the seat 4 is moved to an arbitrary position by the seated person as shown in FIG. It is rocked.

On the other hand, as shown in FIGS. 1 to 4, the reaction force adjusting mechanism 1 of the present embodiment adjusts the magnitude of the rocking reaction force of the biasing spring 5. This reaction force adjustment mechanism 1
Adjustment lever 6 for changing the entire length of the biasing spring 5 according to the principle of leverage, and fixing means 7 for fixing the position of the adjustment lever 6.
And is equipped with. Therefore, the length of the biasing spring 5 can be changed by utilizing the lever principle by operating the adjusting lever 6, so that the reaction force can be adjusted with a light force.
Further, even when a larger reaction force is adjusted, the force required for the adjustment can be suppressed to the same level as in the conventional case.

In this embodiment, the locking device 11 and the reaction force adjusting mechanism 1 are mounted on a rocking chair 8 as shown in FIGS. This chair 8 has legs 9
A seat receiving member 2 supported by the legs 9, a seat 4 whose front portion is supported by the seat receiving member 2 so as to rotate and move back and forth, and a seat receiving member 2
And a back support rod 3 rotatably supported with respect to the seat 4 and interlocking with the seat 4, and a backrest 10 attached to the back support rod 3.
And utilizing the urging force of the urging spring 5, the back support rod 3 and the seat 4
A locking device 11 for returning the locking force to the initial position and a reaction force adjusting mechanism 1 for adjusting the magnitude of the rocking reaction force of the biasing spring 5 are provided.

The seat 4 is a seat body 12 having a seating surface 12a.
And a seat frame 13 that supports the seat body 12 so as to be movable back and forth from below. The seat body 12 is composed of a seat plate serving as a core, a cushion placed on the seat plate, and an upholstery cloth covering the cushion. An inner guide groove 14 and an outer guide groove 77 are formed at the front end portion of the seat frame 13 with the front and back as the longitudinal direction. A guide hole 78 is formed in the rear portion of the seat frame 13 with the front-back direction as the longitudinal direction. The seat body 12 is supported in the outer guide groove 77 and the guide hole 78 of the seat frame 13 so as to be movable back and forth with respect to the seat frame 13 by using a pin member or a bolt.

The inner guide groove 14 is slidably and rotatably attached to a front support shaft 15 provided at the upper front end of the seat receiving member 2. A rear end portion of the seat frame 13 is rotatably attached to a rear support shaft 16 provided on the back support rod 3. As a result, when the back support rod 3 tilts backward, the seat frame 1
When the rear part of 3 is pulled rearward, the front part rotates and slides rearward at the same time.

As shown in FIGS. 2 to 4, the locking device 11 includes a central support shaft 17 rotatably attached to the central portion of the seat receiving member 2 and a pressing lever 18 which rotates integrally with the central support shaft 17. An urging spring 5 having one end supported by the pressing lever 18 and the other end supported by the seat receiving member 2 via the reaction force adjusting mechanism 1, and a spring mount 19 holding both ends of the urging spring 5. Is equipped with. The biasing spring 5 is a compression coil spring. Therefore, when the central support shaft 17 rotates due to the rearward tilting of the back support rod 3, the pressing lever 18 causes the biasing spring 5 to move.
Can be compressed to obtain a reaction force. When the external force that tilts the back support rod 3 backward is released, the back support rod 3 is returned to its original position by the urging force of the urging spring 5.

The adjusting lever 6 of the reaction force adjusting mechanism 1 is L-shaped with a long side portion 20 located along the biasing spring 5 and a short side portion 21 attached to the biasing spring 5. There is. Therefore, since the long side portion 20 is along the urging spring 5, the urging spring 5 and the reaction force adjusting mechanism 1 can be compactly integrated. Also, the biasing spring 5
Are arranged in parallel on both left and right sides with the long side portion 20 of the adjusting lever 6 interposed therebetween. Therefore, as compared with the case where only one urging spring 5 is attached, it is possible to obtain a reaction force that is twice as large as that of the urging spring 5, and the urging spring 5 can be made sufficiently long regardless of the presence of the reaction force adjusting mechanism 1. A large reaction force can be obtained.

The tip of the short side portion 21 of the adjusting lever 6 is rotatably supported with respect to the seat receiving member 2. A spring bearing shaft 22 that engages with the spring mount 19 of the biasing spring 5 is attached to the L-shaped corner of the adjusting lever 6.
Therefore, the adjusting lever 6 is always biased by the biasing spring 5 in the direction of rotating forward. Further, fixing means 7 is attached to the long side portion 20 of the adjusting lever 6. In the present embodiment, the fixing means 7 functions to prevent the adjusting lever 6 from rotating forward.

The fixing means 7 is an adjusting screw capable of swinging the adjusting lever 6. Therefore, since the adjusting lever 6 can be swung by rotating the fixing means 7, the reaction force can be easily adjusted with a light force. In this embodiment, the fixing means 7 is the seat receiving member 2
Is rotatably attached to the bottom portion 2a of the. Further, the fixing means 7 includes an operation knob 23 provided outside the seat receiving member 2 and a male screw portion 24 provided inside the seat receiving member 2. The operation knob 23 may have a flat shape along the longitudinal direction of the male screw portion 24, or a cylindrical shape.

The male screw portion 24 of the fixing means 7 penetrates the through hole 20a formed in the long side portion 20 of the adjusting lever 6. Further, a slider 25 having a female screw portion is screwed into the male screw portion 24 of the fixing means 7. The slider 25 has a rectangular parallelepiped shape and is non-rotatably sandwiched between the left and right side walls of the adjusting lever 6. For this reason,
Even if the fixing means 7 is rotated, the slider 25 slides along the longitudinal direction of the male screw portion 24 without rotating.

As a result, when the slider 25 is lowered downward by tightening the fixing means 7, the adjusting lever 6 rotates backward to compress the biasing spring 5 and increase the reaction force (in FIG. 3, Shown with a solid line). Further, when the slider 25 is raised upward by loosening the fixing means 7, the adjusting lever 6 is rotated forward by the spring force of the urging spring 5 so that the urging spring 5 extends and the reaction force can be reduced (Fig. 3 is indicated by a chain double-dashed line).

Further, in the present embodiment, the reaction force adjusting mechanism 1 is arranged on the side of the biasing spring 5. Therefore, the entire front-rear length L including the urging spring 5 and the reaction force adjusting mechanism 1 is
Can be suppressed to a length slightly longer than the longitudinal length of the biasing spring 5. Therefore, the biasing spring 5 and the reaction force adjusting mechanism 1
The front-rear length of the whole is much shorter than the conventional length obtained by adding the front-rear lengths of the biasing spring 5 and the reaction force adjusting mechanism 1. Accordingly, the length of the guide groove 14 of the seat receiving member 2 that supports the front end portion of the seat 4 so as to be able to move back and forth can be sufficiently secured, so that the seat 4 can have a sufficiently long forward and backward movement amount and the chair 8
The reclining effect of can be enhanced. That is, it is possible to secure a large tilt angle and movement amount of the seat 4 and the backrest 10 between the upright position and the reclining position by sufficiently increasing the back-and-forth movement amount of the seat 4. Moreover, since the distance from the front end of the seat 4 to the front end of the seat receiving member 2 can be made sufficiently long, it is difficult to see the mechanical portion below the seat 4 when the chair 8 is viewed from the front, and the appearance is improved. You can

Further, in this embodiment, the biasing spring 5 is provided so as to be inclined with respect to the front-back direction of the chair 8. Therefore, the longitudinal lengths of the biasing spring 5 and the reaction force adjusting mechanism 1 can be further shortened.

In FIG. 4, reference numeral 26 is an elevating lever for pressing the adjusting pin of the gas spring 28 built in the leg 9, and reference numeral 27 is a cable attached for swinging the elevating lever 26. .

As shown in FIGS. 1 and 2, the back support rod 3 has an L-shape having a substantially horizontal front portion 29 and a substantially upright rear portion 30. The front end of the back support rod 3 is fixed to the central support shaft 17 of the locking device 11 so as to rotate integrally therewith. A rear support shaft 16 to which the rear end of the seat 4 is rotatably connected is formed at the center of the front portion 29 of the back support rod 3.

On the other hand, a lumbar support adjusting mechanism 43 for adjusting the protrusion amount of the lumbar support of the backrest 10 is provided at the rear portion of the front portion 29 of the back support rod 3. Backrest 10
The lower portion is supported by the lumbar support adjusting mechanism 43, and the central portion is supported by being screwed to the upper end portion of the rear portion 30 of the back support rod 3.

This backrest 10 is, as shown in FIG.
For example, it is provided with a frame-shaped inner member 44 made of plastic, and a bag-shaped skin member 45 which is made of, for example, an elastomer such as rubber or polyester having elasticity and which wraps the inner member 44. Since the inner member 44 is in the shape of a frame, the back of the seated person is supported only by the skin member 45, so that a high cushioning property can be obtained and the sitting comfort can be improved.

As shown in FIGS. 2 and 11 to 13, the lumbar support adjusting mechanism 43 is a support body 46 which is fixed to the lower portion of the backrest 10 and can be pushed forward.
And a support shaft 47 that attaches the support body 46 to the back support rod 3 and supports the back support rod 3 slidably in the front-rear direction.
A rotatable screw shaft 48 provided along the support shaft 47, a slider 49 screwed onto the screw shaft 48, and a link 5 rotatably connecting the slider 49 and the support shaft 47.
It has 0 and.

The support body 46 slides by fitting a mounting portion 51 to which the lower part of the backrest 10 is mounted, a support hole 52 through which the support shaft 47 penetrates, and a guide pin 53 formed on the back support rod 3. Guide groove 54, and a seat support portion 55 that is screwed to the rear portion 12b of the seat body 12 and supports the rear portion of the seat 4 from below. A support groove 56 is formed in the back support rod 3 to support the support shaft 47 so as to be movable back and forth. Here, the support groove 56 and the guide groove 54 are formed to have an angle of, for example, about 25 degrees. Therefore, when the support shaft 47 slides in the support groove 56, the support main body 46 also moves back and forth, but at this time, the guide groove 54 moves with an inclination of 16 degrees, so that the support main body 46 as a whole has the support groove 56. Will rotate about a point C where the normals of the guide groove 54 intersect.

Since the lower portion of the backrest 10 and the rear portion of the seat body 12 are fixed to the support body 46, the shape of the backrest 10 changes due to the inclination of the support body 46 and at the same time the seat body 12 moves back and forth. The shape of the seat body 12 changes. That is, when the backrest 10 has a relatively flat shape and the seat body 12 is positioned on the front side (shown by a chain double-dashed line in FIG. 12), or the waist portion of the backrest 10 projects and the seat body 12 is It can be changed to a state of being located on the rear side (shown by a solid line in FIG. 12). As a result, when supporting a posture in which the spine has an I shape with a relatively flat shape (see FIG. 1).
4)), or the case where the waist portion projects as a lumbar support and the seat body 12 is pulled backward to support the posture in which the spine is S-shaped (see FIG. 15).

Further, as shown in FIG. 13, the screw shaft 48 is formed with a right-hand thread and a left-hand thread with the central portion as a boundary. Then, two sliders 49 are provided so as to sandwich the central portion. Therefore, by rotating the screw shaft 48, the two sliders 49 slide in opposite directions.
Then, when the links 50 are parallel to each other, the support shaft 47 is located at the frontmost position (indicated by a solid line in FIG. 13). When the screw shaft 48 is rotated from this state, the sliders 49 are separated or approached, the links 50 are not parallel, and the support shaft 47 is pulled backward. Along with this, the support body 46 is rotated and the height of the lumbar support can be adjusted. The adjustment of the screw shaft 48 may be performed using a tool such as a screwdriver, or may be performed by operating an operation knob that rotates integrally with the screw shaft 48.

When the chair 8 described above is used, the seated person can perform rocking by leaning on the backrest 10 and leaning the backrest 10. Then, the reaction force of the rocking can be adjusted by operating the reaction force adjusting mechanism 1.

Further, even if the seat 4 and the backrest 10 are tilted and locked and the lock is released when the seat is left standing, the seat 4 and the backrest 10 are held in the tilted state.
Then, by re-seating, the self-holding is released,
The seat 4 and the backrest 10 are unlocked so that they can be locked.

In the present embodiment, the seat 4 and the backrest 10 are positioned by the engagement of the locked link 32 and the lock member 33, so that the biasing spring is different from the case of using the gas spring with the lock mechanism. It is necessary to increase the spring force of No. 5. However, since the operating force of the reaction force adjusting mechanism 1 here is small, the reaction force can be easily adjusted.

The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, the lumbar support adjustment mechanism 43 adjusts the height of the lumbar support by moving the support body 46 fixed to the lower portion of the backrest 10 as shown in FIGS. 2 and 11 to 13. However, it is not limited to this. For example, as shown in FIGS.
The lumbar support adjusting mechanism 43 is provided with a guide rail 57 that supports the lower part of the backrest 10 so as to be able to move up and down, and an operation lever 58 that is supported so as to be vertically swingable with respect to the back support rod 3, A part of the lever 58 may be connected to the lower portion of the backrest 10 so that the lower portion of the backrest 10 is guided by the guide rail 57 and moves up and down as the operation lever 58 moves up and down.

In this embodiment, the guide rails 57 are provided on the left and right back support rods 3 and the guide rails 57 are provided.
A connecting member 59 for connecting the above is provided. The operation lever 58 is provided on the left and right from the central portion of the connecting member 59. The inner end 58a of each operating lever 58 is rotatably provided at the center of the connecting member 59, and the outer end 58b is provided through the guide rail 57 so as to be operated from the outside. Further, the lower portion of the backrest 10 is attached to the central portion 58c of each operation lever 58. Here, a laterally long through hole 60 is formed in the lower portion of the backrest 10 (see FIG. 18), and the backrest 10 is screwed to the operation lever 58 with a bolt penetrating the through hole 60.

Therefore, when the operation lever 58 is at the lowermost position, the lower part of the backrest 10 is also at the lowermost position (FIG. 17).
(A)). At this time, the backrest 10 has a relatively flat shape, which is suitable for supporting the posture in which the spine is I-shaped (FIG. 14). When the operating lever 58 is at the uppermost position, the lower portion of the backrest 10 is also at the uppermost position (FIG. 17).
(B)). At this time, the waist portion of the backrest 10 is projected, which is suitable for supporting the posture in which the spine is S-shaped (FIG. 15).

In the above-described embodiment, as shown in FIG. 11, the central portion of the backrest 10 is attached to the upper portion of the back support rod 3 which is about half the height of the backrest 10 by screwing. Not limited to For example, FIGS. 14, 15, and 1
As shown in FIGS. 8 to 20, a back support rod 3 having the same height as the backrest 10 may be swingably provided in the central portion in the front-rear direction. In this case, as shown in FIG. 18, the back support rod 3 includes a lower half portion 61 attached to the seat receiving member 2 and an upper half portion 62 rotatably attached to the lower half portion 61. . Here, the upper half portion 62 has a frame shape. Upper half 6
2 and the lower half part 61 are rotatably attached to the front and back by left and right connecting pins 63.

The backrest 10 is provided with, for example, a frame-shaped inner member 44 made of plastic, and a bag-shaped skin member 45 that is made of an elastomer such as rubber or polyester having elasticity and that wraps the inner member 44. . A horizontal opening 64 is formed in the center of the back surface of the skin member 45. The upper skin member 65 above the opening 64 is formed in a bag shape larger than the inner member 44. The upper half 62 is hidden inside the upper skin member 65. Therefore, the appearance of the backrest 10 can be improved.

The lower portion of the upper half 62 is screwed to the inner member 44 of the backrest 10 as shown in FIG. The upper end portion of the upper half portion 62 is engaged with the inner member 44 of the backrest 10 as shown in FIG. The mode of engagement is not particularly limited, and a convex portion 66 and a concave portion 67 that completely fit each other are formed as shown in FIG. 7A, or a mountain portion that is simply caught as shown in FIG. 68 and the valley portion 69 may be formed. Thus, by fixing the upper half portion 62 to the inner member 44 of the backrest 10,
It is possible to prevent the upper half 62 from falling.

According to the backrest 10 and the back support rod 3,
As the lower part of the backrest 10 is moved up and down by the lumbar support adjusting mechanism 43, the upper half of the backrest 10 swings so that the shape of the backrest 10 changes.

In the embodiment shown in FIGS. 18 and 19, the upper part of the back support rod 3 is hidden inside the upper skin member 65, but the invention is not limited to this. For example, as shown in FIG. 21, an outer cover 70 that hides the upper half portion 62 of the back support rod 3 between the backrest 10 and the backrest 10 may be attached from the rear.

Although the compression coil spring is used as the reaction force applying mechanism in this embodiment, the invention is not limited to this, and a torsion bar or a gas spring may be used. Further, in the above-described embodiment, the first urging means 34 and the second urging means 34
Although the biasing means 36 are tension coil springs having the same spring constant, the biasing means 36 is not limited to this and may be tension coil springs having different spring constants. Further, the first urging means 34 and the second urging means 36 are not limited to the tension coil springs, and the lock member 33 may be urged by the load of the weight. Alternatively, a mechanism such as a balance is used as the first urging means 34 and the second urging means 36, and when the weight is placed on one side of the balance, the weight is urged to the lock position side and the weight is attached to the other side. Alternatively, the weight may be biased to the unlock position side when placed, and the position of the weight may be changed to one side and the other side by the operation means 35.

On the other hand, in the locking device 11 shown in FIGS. 5 to 10 described above, the lock member 33 is provided on the seat frame 13, but the lock member 33 is not limited to this and may be provided on the seat receiving member 2. Further, the locked link 32 is provided so as to swing by the relative movement of the seat receiving member 2 and the seat frame 13, but not limited to this, the locked link 32 may be linearly moved. In any case, the locking device 11 can be miniaturized by moving the locked link 32 in a direction having a spatial margin in accordance with the shapes of the seat receiving member 2 and the seat 4.

Further, in the locking device 11 shown in FIGS. 5 to 10 described above, the locked link is used as the locked member 32, but the locking member is not limited to this and may be a gear or the like.

Further, in the above-described embodiment, FIGS.
As shown in FIG. 5, the operation means 35 can be held in the unlocked position, and the first urging means 34 moves the seat frame 13
And the lock member 33, and the second urging means 36 is attached between the operating means 35 and the lock member 33. When the operating means 35 is held in the unlock position, the first urging means is urged. The means 34 and the second urging means 36 are balanced to hold the lock member 33 in the unlock position, and when the operating means 35 is brought to the lock position, the first urging means 34 holds the lock member 33 in the lock position. However, it is not limited to this.

For example, as shown in FIG. 22, operating means 35
Can be held in the lock position, the second urging means 36 is attached between the seat frame 13 and the lock member 33, and the first urging means 34 is formed between the operating means 35 and the lock member 33. It may be attached between them.
In this case, if the operating means 35 is held in the lock position, the first
The biasing means 34 and the second biasing means 36 are balanced to hold the lock member 33 in the locked position, and the operating means 35
When is set to the unlock position, the second biasing means 36 holds the lock member 33 in the unlock position. In this case also, even if the operating member 35 is operated to the unlock position and the lock member 33 is pulled out from the engaging portion 31 in the locked state where the operating member 35 is set to the lock position and the lock member 33 is fitted in the engaging portion 31, The lock member 33 cannot move due to a large friction with the inner wall of the engaging portion 31, so that the seat 4 and the backrest 10 cannot be moved.
The tilt lock is maintained and self-held.

Further, although the locking device 11 is applied to the rocking chair in each of the above-mentioned embodiments, the invention is not limited to this, and the rocking device 11 swingably supports the supported member, particularly the supported member. The present invention can be generally applied to those in which the support member and the support member are swung so as to sandwich the rotary shaft between them. For example, it can be used for a table, a drawing table, etc. of a personal computer desk having a considerable weight. Since such a table top has a considerable weight, a large reaction force is applied to balance it. In this case, when the operation lever is operated to the unlock side while the load is not applied to the table plate, the table plate is held by itself, so that the phenomenon of the table plate suddenly jumping up can be prevented.
Further, by using the reaction force adjusting mechanism 1, the rocking reaction force can be adjusted with a light force.

[0065]

As is apparent from the above description, according to the locking device of the first aspect, since the locked member amplifies the relative movement amount between the supporting member and the supported member, The number of lockable steps can be increased.
In addition, since a sufficient margin can be provided between the engaging portions, a robust structure can be obtained.

Further, since the moving direction of the locked member can be set separately from the swinging direction of the supported member, the locked member can be moved in a direction with a spatial margin in accordance with the shapes of the supporting member and the supported member. It is possible to reduce the size of the locking device by moving the.

Further, according to the locking device of the second and third aspects, the operating means can be held only in the unlocked position, or can be held only in the locked position, or both positions. It is possible to form the operation means having preferable operability according to the type of the locking device by selecting whether or not it can be held.

According to the locking device of the fourth aspect, the locked member can swing in the horizontal plane, and the engaging portion is arranged on the circumferential surface centering on the rotation center of the locked member. Therefore, the thickness of the locking device in the vertical direction can be reduced. Therefore, this locking device can be built in, for example, a seat of a chair.

Further, according to the rocking device of the fifth aspect, since the first biasing means and the second biasing means are tension coil springs having the same spring constant, the first biasing means and the second biasing means. Parts can be shared with.

[Brief description of drawings]

FIG. 1 is a side view of a central longitudinal section showing an overview of a chair equipped with a reaction force adjusting mechanism.

FIG. 2 is an exploded perspective view showing a main part of a chair equipped with a reaction force adjusting mechanism.

FIG. 3 is a central longitudinal sectional view showing a reaction force adjusting mechanism and a locking device.

FIG. 4 is a perspective view showing a reaction force adjusting mechanism and a locking device.

FIG. 5 is a perspective view showing a state in which a seat frame is attached to a seat receiving member.

FIG. 6 is a perspective view of the locking device of the present invention seen from below.

FIG. 7 is a plan view showing the locking device when the seat and the backrest are locked.

FIG. 8 is a plan view showing a locking device when a seat and a backrest are self-held.

FIG. 9 is a plan view showing the locking device when the seat and backrest are unlocked.

FIG. 10 is a plan view showing the locking device when the seat and the backrest are locked.

FIG. 11 is a perspective view showing a back support rod and a backrest.

FIG. 12 is a side view of a central longitudinal section showing a back support rod and a backrest.

FIG. 13 is a plan view showing a main part of a lumbar support adjusting mechanism.

FIG. 14 is a side view showing a state where the spine is seated in an I-shaped posture.

FIG. 15 is a side view showing a state where the spine is seated in an S-shaped posture.

FIG. 16 is a perspective view showing another embodiment of the lumbar support adjusting mechanism.

FIG. 17 is a front view showing another embodiment of the lumbar support adjusting mechanism, (A) showing a low lumbar support state, and (B) showing a high lumbar support state.

FIG. 18 is a perspective view showing another embodiment of the back support rod and the backrest.

FIG. 19 is a side view of a central longitudinal section showing another embodiment of the back support rod and the backrest.

FIG. 20 is a central longitudinal cross-sectional side view showing a connection structure of a back support rod and a backrest, (A) engaging a concave portion and a convex portion, and (B) engaging a mountain portion and a valley portion, respectively.

FIG. 21 is a perspective view showing another embodiment of the back support rod and the backrest.

FIG. 22 is a plan view showing another locking device.

FIG. 23 is a side view showing a conventional locking device with a lock mechanism.

FIG. 24 is a side view of a central longitudinal section showing a conventional locking device having a self-holding function.

FIG. 25 is a perspective view showing a biasing member of a conventional locking device having a self-holding function.

[Explanation of symbols]

2 Seat receiving member (supporting member) 3 Back support rod (supported member) 4 seats (supported members) 5 Energizing spring (reaction force applying mechanism) 11 Locking device 31 Engagement part 32 Locked link (locked member) 33 Lock member 34 First urging means 35 Operation means 36 Second urging means

Claims (5)

[Claims] 1. A rocking device that swingably supports a supported member with respect to a supporting member and biases the supported member toward an original position by a reaction force imparting mechanism, and has a plurality of engaging portions. Is attached to the support member and the supported member, and is moved by swinging of the supported member, and the relative movement amount of the support member and the supported member is amplified to move the engaging portion. When the locked member and either the support member or the supported member are attached to the engaging portion such that they can move in and out, and when the engaged member is fitted into the locked portion, the swinging of the supported member is desired by the user. A lock member that locks at the position, and a first urging unit that urges the lock member in a direction to engage the engagement portion,
Second biasing means for biasing the lock member in the direction of withdrawing from the engaging portion, and the lock member connected to the lock member via the first biasing means or the second biasing means, and the lock position and unlock position. And operating means for switching between the lock positions, changing the biasing force applied to the lock member by the switching, and maintaining the biased force applied to the biasing means connected thereto. Locking device. 2. The locking device according to claim 1, wherein the operating means is connected to the second biasing means and can be held in an unlocked position. 3. The locking device according to claim 1, wherein the operating means is connected to the first biasing means and can be held in a locked position. 4. The locked member is capable of swinging in a horizontal plane, and the engaging portion is arranged on a circumferential surface centered on a rotation center of the locked member. Item 4. The locking device according to any one of items 1 to 3. 5. The locking device according to claim 1, wherein the first urging means and the second urging means are tension coil springs having the same spring constant.