JP2012254309A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair whose seat can be moved back and forth with respect to a seat support, and can be fixed in a predetermined front-back movement position by appropriate operations.SOLUTION: A seat 6 is supported by a seat support through a rack pinion mechanism to be moved and regulated back and forth, a rack is prepared at an upper surface of the seat support, a pinion 63 is prepared at a lower surface of a shell composing the seat 6, and an operation lever 110 of a fixing mechanism 100 including a regulating piece 101 that locks the seat 6 at a desired position of a back and forth direction by biting with the pinion 63 through a contacting/removing action to the pinion 63 is prepared at a position to be moved back and forth integrally with the seat 6.

Description

  The present invention relates to a chair in which a seat portion can be moved back and forth with respect to a seat, and more particularly to a chair that can be accurately fixed and released at a desired front and rear position with respect to a seat portion.

  Recent chairs can take a proper posture at work, and can also take a resting posture and a refreshing posture selectively. The one that implements this mechanism has been put into practical use.

  By the way, paying attention to the front / rear position adjustment mechanism, the conventional one is configured so that the seat part can be moved back and forth with respect to the seat receiver, and the operation part is locked to the arbitrary position to fix the seat part at an arbitrary position. It is customary to provide it on the seat receiving side together with an operation unit for operating and the like.

  However, when the seat portion moves back and forth, the relative position of the operation portion with respect to the seat portion changes. For this reason, when performing an operation while in the sitting position, it is difficult to properly apply a finger to the operation part if the hand is on the seat part, and the support of the body becomes unstable if the hand is placed on the operation part. In some cases, this may cause a problem that the posture is easily lost. Especially, in a chair that puts a hand on the seat and moves the seat back and forth by artificial operation force, it is necessary to hold the seat firmly by hand, so it is difficult to put fingers on the operation part, You will be forced to perform more difficult operations.

  In order to solve such problems, the present invention takes the following measures.

  In other words, the chair of the present invention is configured by attaching the seat part to the seat so as to be movable back and forth, and includes a fixing mechanism that selectively fixes the seat part to a desired position in the front-rear direction. The operation part which operates is provided in the position which can move back and forth integrally with a seat part.

  If it is such, an operation part will always move with the back-and-forth movement of a seat part, and a relative position with respect to a seat part does not change. For this reason, it is possible to ensure an operation state in which the hand is accurately touched on the seat portion and a finger is appropriately placed on the operation portion, and both favorable operability and stability of the seating posture can be suitably achieved.

  As a specific embodiment, the seat is supported by the seat receiver via the rack and pinion mechanism, the rack is provided on the seat receiving side, and the pinion is mounted on the seat side together with the fixing mechanism and the operation section. What is provided.

  As an example of a simple fixing mechanism in this case, there is one that includes a regulating piece that selectively engages with and locks the pinion through a contact and separation operation with respect to the pinion.

  In order to prevent the space between the seat and the seat portion from becoming bulky due to the presence of the fixing mechanism, it is desirable that the regulating piece is moved along the horizontal direction.

  Since the present invention is configured as described above, the present invention is particularly useful when applied to a chair in which the back-and-forth movement of the seat relative to the seat is caused by an operating force applied from the outside.

  In order to make the above-mentioned operation unit easy to use and look good in consideration of the operation unit of another mechanism, the operation unit for operating the fixing mechanism is provided with the operation unit of the other mechanism provided on the seat receiving side. At the same time, it is effective to form an array having apparent regularity at least in a predetermined front-rear position.

  As a preferable specific example of the operation unit, there is a lever-like one that takes a substantially horizontal posture when not operated.

  Since the present invention has the configuration described above, it is possible to effectively adjust the front / rear position of the seat by accurately holding the hand on the seat and maintaining a state where the finger is properly placed on the operation unit that operates the fixing mechanism. This makes it possible to achieve both good operability and stable seating posture.

The side view which shows one Embodiment of this invention. The front view. FIG. FIG. FIG. FIG. The top view which removes a seat part and shows the same embodiment. The bottom view which shows the seat part of the embodiment. The figure which shows the fixing mechanism which is the principal part of the embodiment. The side view of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a side view and a front view of a chair 1 showing an embodiment of the present invention, FIG. 3 is a partially exploded perspective view showing a part of a mechanism, and FIGS. 4 to 6 are actions of this chair. It is explanatory drawing.

  This chair 1 is formed by supporting the backrest part 5 and the seat part 6 on the base leg 2 and can take not only a use posture suitable for work, but also a posture suitable for repose and refreshment as appropriate. In order to be able to take it selectively, the elevating mechanism P for adjusting the height of the back seat between the base leg 2 or between the base leg 2 and the backrest portion 5, the seat portion 6, etc., the backrest portion Locking mechanism Q that interlocks and locks the seat 5 and the seat 6, an upper tilting mechanism R that tilts only the upper part of the backrest 5 backward for stretching, etc., and for selectively pressing the hipbone, etc. A lower backrest tilting mechanism S is provided.

  More specifically, the base leg 2 has a rotating shaft 21 protruding upward from the center of the leg blade 20, and the seat portion 6 and the backrest portion 5 supported thereon are arranged around the rotating shaft 21. It can be made to turn. The elevating mechanism P incorporates a gas spring 22 in the rotating shaft 21 of the base leg 2 and operates the gas spring 22 as appropriate so that the back seat can be locked at an arbitrary elevating position in the operating range. .

  The backrest portion 5 includes a backrest lower frame 50, a backrest upper frame 55, and a tension member 8 spanned between the frames 50 and 55 via an elastic member (not shown). Both 50 and 55 are rotatably attached to a rotating shaft 72 provided in the inner part of the link element 7b.

The seat 6 includes a cushion body 60 having a depression corresponding to the thigh of the seated person, and a shell 61 that supports the lower side of the cushion body 60.

  On the other hand, the locking mechanism Q includes a support base 3 attached to the base leg 2, a seat receiver 4 that supports the seat portion 6, and link elements 7 a and 7 b that connect between the support base 3 and the seat receiver 4. The unequal side four-side link mechanism is mainly used, and a gas spring 31 for fixing the link element 7a at an appropriate position is attached thereto. The seat Z of the present invention is constituted by the seat portion 6 and the seat receiver 4.

  The support base 3 has a V-shape made of a rigid member such as an aluminum die cast, and its base end is fixed to the rotary shaft 21 and the tip protrudes obliquely upward. A torsion bar 70 capable of accumulating and releasing elastic force in the torsional direction through a rotating shaft (not shown) is provided on the lower surface of the central part of the hypotenuse of the support base 3.

  The seat receiver 4 is formed into a planar shape by a metal member such as aluminum so as to support the shell 61 of the seat portion 6, and an elbow for attaching the armrest 9 to the left and right sides of the seat receiver 4. A scissors mounting portion 44 (see FIG. 7) is provided.

  The link element 7 a is a plate-like member having one end rotatably attached to the front of the support base 3 via the rotary shaft 30 and the other end rotatably attached to the front back surface of the seat receiver 4 via the support shaft 74. is there.

  One end of the link element 7b is fixed to the rotation shaft of the torsion bar 70 provided at the center of the hypotenuse of the support base 3, and the other end is rotatably connected to the rotation shaft 79 provided on the rear end side of the seat 4. Normally, the lower backrest frame 50 and the upper backrest frame 55 described above are integrally fixed to the link element 7b in a state where the rotation function around the rotation shaft 72 is stopped, and the torsion bar 70 together with the link element 7b. It can rotate around the rotation axis.

  The gas spring 31 is provided between the link element 7a and the support base 3, and locks the entire four-sided link mechanism by selectively fixing the link element 7a.

  Further, the backrest upper tilting mechanism R functions by allowing the backrest upper frame 55 to rotate around the rotation shaft 72, and specifically includes a lock mechanism r and a spring member 73. .

  As shown in FIG. 3, the locking mechanism r includes a hole 77 provided above the link element 7b, a hole 551 provided in a bracket 550 having a generally rhombic shape in side view attached to the backrest upper frame 55, The pin 76 is disposed at a position straddling both the hole portions 77 and selectively lifted from the hole portion 551 to release the restraint between the backrest upper frame 55 and the link element 7b. Inside the bracket 550 located inside the lower end of the backrest upper frame 55, a bracket 7b1 having the same shape is provided so as to be integrated with the link 7b. The brackets 550 and 7b1 are overlapped to form the hole 551. The hole 77 is positioned inside and the pin 76 is inserted. Thus, in a state where the pin 76 is inserted into both the hole portions 77 and 551, the link element 7b and the backrest upper frame 55 are restrained and move integrally, and the pin 76 is pulled out from the hole portion 551. Thus, the above restraint is released so that only the backrest upper frame 55 can independently rotate about the rotation shaft 72.

  The spring member 73 is for imparting elasticity to the backrest upper frame 55 when tilted, and presses the backrest upper frame 55 in the standing direction.

  Further, the lower backrest tilting mechanism S utilizes the lower backrest frame 50, and a gas spring (not shown) is provided at a position where the lower backrest frame 50 can be pressed forward with the rotating shaft 72 as a fulcrum.

  Thus, at the front end of the seat receiver 4, levers 43a, 43b, 43c are provided as shown in FIG. 7 in order to selectively utilize the above mechanisms P to S with the seat 6 attached. It is provided. The lever 43a is for raising and lowering the seat 6 as shown in FIG. 4, the lever 43b is for tilting only the lower backrest frame 50 as shown in FIG. 6, and the lever 43c is shown in FIG. In this manner, the seat portion 6, the backrest upper frame 55, and the backrest lower frame 50 are interlocked and locked together. The tilting of only the backrest upper frame 55 can be performed only when not rocking, and can be performed without operating the lever.

  In the configuration as described above, the present embodiment is provided with the seat front / rear adjustment mechanism T that attaches the seat portion 6 to the seat receiver 4 so as to be movable back and forth and moves the seat portion 6 back and forth.

  As described above, the seat portion 6 comprises the cushion body 60 and the shell 61. In order to enable the shell 61 to be detachably attached to the seat receiver 4, as shown in FIG. Protruding portions 62f and 62b are provided on the front end side and the rear end side. On the other hand, the seat receiver 4 is provided with elongated holes 40f and 40b extending in the front-rear direction as shown in FIG. 7 at the corresponding positions of the projecting portions 62f and 62b. Then, by inserting the projecting portions 62f and 62b of the shell 61 into the long hole portions 40f and 40b and adopting an appropriate retaining structure on the insertion end side, the seat portion 6 can be moved back and forth with respect to the seat support 4. While permitting, the upward disengagement is regulated.

  On the other hand, the seat back-and-forth movement mechanism T is provided with the rack 41 on the upper surface of the seat receiver 4 and the pinion 63 on the lower surface of the shell 61 constituting the seat portion 6 so that the rack 41 and the pinion 63 are engaged with each other. Thus, the back-and-forth slide movement of the seat portion 6 with respect to the seat receiver 4 is guided. The racks 41 are provided in pairs at positions spaced from the center in the width direction of the seat receiver 4 in the left-right direction, and the pinion 63 is a shaft held by a shaft holding portion 64 formed on the lower surface side of the seat portion 6. 65 is formed at both end portions. That is, the seat back-and-forth moving mechanism T is configured to move the seat portion 6 back and forth with respect to the seat receiver 4 by applying an artificial operation force.

  Then, in order to selectively fix the seat 6 to a desired position in the front-rear direction, the fixing mechanism 100 shown in FIGS. 8 to 10 is provided, and a lever 110 serving as an operation unit for operating the fixing mechanism 100 is shown in FIG. Thus, it is provided at a position where it can move back and forth integrally with the seat portion 6.

  The fixing mechanism 100 includes a restriction piece 101 that selectively engages and locks with the pinion 63 through the contact and separation operation with respect to the pinion 63. The restriction piece 101 is slidably attached to a guide groove 102 formed on the lower surface side of the seat portion 6, and has a proximal end connected to one end of the wire tube 103, and is connected to the pinion 63 through a wire operation. The teeth 104 formed at the tip of the pinion 63 can be selectively meshed with the pinion 63 by moving toward and away from the horizontal direction. The restricting piece 101 is elastically pressed in a direction to engage with the pinion 63 by a spring 105 provided in the guide groove 102.

On the other hand, the lever 110 is attached to a lever holding portion 110a provided on the lower surface of the right end portion on the front end side of the seat portion 6, and the other end side of the wire tube 103 is operably connected at that position. Sometimes, the levers 43a, 43b, 43c described above are level and are arranged with a regular pitch with the levers 43a, 43b, 43c at the front and rear positions when the seat 6 slides to the rear end side. Is provided. Then, only when the lever 110 is operated, the restricting piece 101 is retracted against the spring 105, the restricting piece 101 is detached from the pinion 63 to allow the seat portion 6 to move back and forth, and the lever 110 is moved to the lever. The seat 6 can be moved forward as indicated by an imaginary line in FIG. 6 while being separated from the front 43a.

  As described above, the chair according to the present embodiment is configured to attach the seat portion 6 to the seat receiver 4 so as to be movable back and forth. Then, a fixing mechanism 100 that selectively fixes the seat 6 to a desired position in the front-rear direction is provided, and a lever 110 that is an operation unit for operating the fixing mechanism 100 is provided at a position that can be moved back and forth together with the seat 6. It is a thing.

  For this reason, the lever 110 always moves with the back-and-forth movement of the seat 6 and does not change the relative position with respect to the seat 6. Accordingly, it is possible to maintain an operation state in which the hand is accurately touched on the seat portion 6 and a finger is appropriately placed on the lever 110, and it is possible to suitably achieve both good operability and stability of the sitting posture. Become.

  Specifically, the seat 6 is supported by the seat receiver 4 via a rack and pinion mechanism, the rack 41 is provided on the seat receiver 4 side, and the pinion 63 is seated together with the fixing mechanism 100 and the lever 110. 6 is provided on the side 6, the operation in the front-rear direction can be ensured, and at the same time the rotation of the pinion 63 is securely locked to the fixing mechanism 100 with the seat portion 6 as a scaffold, It is possible to prevent the parts from moving, and it is possible to relatively easily incorporate these parts into the seat 6 and the seat receiver 4.

  Particularly, since the fixing mechanism 100 only employs the restriction piece 101 that selectively engages with the pinion 63 through the contact / separation operation with respect to the pinion 63 and locks its rotation, a compact built-in state can be realized.

  And since the contact / separation operation | movement of the said control piece 101 is made along a horizontal direction, it is not necessary to ensure the operation space of the thickness direction between the seat receiver 4 and the seat part 6, and the fixing mechanism 100 It is possible to effectively prevent the space between the seat 4 and the seat 6 due to the presence of.

  In particular, in this embodiment, since the back-and-forth movement of the seat 6 with respect to the seat 4 is caused by an operation force artificially applied from the outside, the seat 6 is operated in the front-rear direction in the seated state. However, it is possible to perform the operation of operating the lever 110 at the same time very naturally.

  Further, the lever 110 for operating the fixing mechanism 100 is regularly arranged at the rearward movement position of the seat portion 6 together with levers 43a, 43b, 43c which are operation portions such as a locking mechanism Q provided on the seat receiver 4 side. Since it is configured, the lever 110 can be effectively operated in association with the operation of the levers 43a, 43b, and 43c, and the usability and appearance can be improved.

  The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

4 ... Seat receiver 6 ... Seat 41 ... Rack 43a, 43b, 43c ... Lever (operation part of other mechanism)
63 ... Pinion 100 ... Fixing mechanism 101 ... Restricting piece 110 ... Operation part (lever)
P ... Elevating mechanism (other mechanisms)
Q ... Locking mechanism (other mechanisms)
R ... Backrest upper tilting mechanism (other mechanisms)
S ... Lower backrest tilting mechanism (other mechanisms)

  The present invention relates to a chair in which a seat portion can be moved back and forth with respect to a seat, and more particularly to a chair that can be accurately fixed and released at a desired front and rear position with respect to a seat portion.

  Recent chairs can take a proper posture at work, and can also take a resting posture and a refreshing posture selectively. The one that implements this mechanism has been put into practical use.

  By the way, paying attention to the front / rear position adjustment mechanism, the conventional one is configured so that the seat part can be moved back and forth with respect to the seat receiver, and the operation part is locked to the arbitrary position to fix the seat part at an arbitrary position. It is customary to provide it on the seat receiving side together with an operation unit for operating and the like.

  However, when the seat portion moves back and forth, the relative position of the operation portion with respect to the seat portion changes. For this reason, when performing an operation while in the sitting position, it is difficult to properly apply a finger to the operation part if the hand is on the seat part, and the support of the body becomes unstable if the hand is placed on the operation part. In some cases, this may cause a problem that the posture is easily lost. Especially, in a chair that puts a hand on the seat and moves the seat back and forth by artificial operation force, it is necessary to hold the seat firmly by hand, so it is difficult to put fingers on the operation part, You will be forced to perform more difficult operations.

  In order to solve such problems, the present invention takes the following measures.

That is, the chair of the present invention has a backrest and a seat supported by a base leg, and a support base attached to the base leg and a seat support that supports the seat are connected by front and rear link elements. A locking mechanism that interlocks and locks the backrest and the seat, and is configured by attaching the seat to the seat so as to be movable back and forth,
The front link element has one end rotatably attached to the front of the support base via a rotary shaft and the other end rotatably attached to the seat support via a support shaft, and the backrest portion is tilted backward. The front link element is tilted rearward from a substantially upright state in a side view, and the locking mechanism is configured such that when the backrest tilts backward, the rear end side of the seat receiver And a fixing mechanism that selectively fixes the seat portion to a desired position in the front-rear direction, and an operation portion that operates the fixing mechanism is arranged in front of the armpit. In addition, it is provided at a position where it can move back and forth together with the seat portion, and the base leg has a rotating shaft protruding upward from the center of the leg blade .

  If it is such, an operation part will always move with the back-and-forth movement of a seat part, and a relative position with respect to a seat part does not change. For this reason, it is possible to ensure an operation state in which the hand is accurately touched on the seat portion and a finger is appropriately placed on the operation portion, and both favorable operability and stability of the seating posture can be suitably achieved.

The present invention, as described above because construction is that, before and after movement of the seat relative to the seat support is applied to a chair, such as caused by the operation force that is applied from a hand attached to said seat and particularly useful Become.

  A preferred specific example of the operation unit is a lever that takes a substantially horizontal posture when not operated.

  Since the present invention has the configuration described above, it is possible to effectively adjust the front / rear position of the seat by accurately holding the hand on the seat and maintaining a state where the finger is properly placed on the operation unit that operates the fixing mechanism. This makes it possible to achieve both good operability and stable seating posture.

The side view which shows one Embodiment of this invention. The front view. FIG. FIG. FIG. FIG. The top view which removes a seat part and shows the same embodiment. The bottom view which shows the seat part of the embodiment. The figure which shows the fixing mechanism which is the principal part of the embodiment. The side view of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a side view and a front view of a chair 1 showing an embodiment of the present invention, FIG. 3 is a partially exploded perspective view showing a part of a mechanism, and FIGS. 4 to 6 are actions of this chair. It is explanatory drawing.

  This chair 1 is formed by supporting the backrest part 5 and the seat part 6 on the base leg 2 and can take not only a use posture suitable for work, but also a posture suitable for repose and refreshment as appropriate. In order to be able to take it selectively, the elevating mechanism P for adjusting the height of the back seat between the base leg 2 or between the base leg 2 and the backrest portion 5, the seat portion 6, etc., the backrest portion Locking mechanism Q that interlocks and locks the seat 5 and the seat 6, an upper tilting mechanism R that tilts only the upper part of the backrest 5 backward for stretching, etc., and for selectively pressing the hipbone, etc. A lower backrest tilting mechanism S is provided.

  More specifically, the base leg 2 has a rotating shaft 21 protruding upward from the center of the leg blade 20, and the seat portion 6 and the backrest portion 5 supported thereon are arranged around the rotating shaft 21. It can be made to turn. The elevating mechanism P incorporates a gas spring 22 in the rotating shaft 21 of the base leg 2 and operates the gas spring 22 as appropriate so that the back seat can be locked at an arbitrary elevating position in the operating range. .

  The backrest portion 5 includes a backrest lower frame 50, a backrest upper frame 55, and a tension member 8 spanned between the frames 50 and 55 via an elastic member (not shown). Both 50 and 55 are rotatably attached to a rotating shaft 72 provided in the inner part of the link element 7b.

  The seat 6 includes a cushion body 60 having a depression corresponding to the thigh of the seated person, and a shell 61 that supports the lower side of the cushion body 60.

  On the other hand, the locking mechanism Q includes a support base 3 attached to the base leg 2, a seat receiver 4 that supports the seat portion 6, and link elements 7 a and 7 b that connect between the support base 3 and the seat receiver 4. The unequal side four-side link mechanism is mainly used, and a gas spring 31 for fixing the link element 7a at an appropriate position is attached thereto. The seat Z of the present invention is constituted by the seat portion 6 and the seat receiver 4.

  The support base 3 has a V-shape made of a rigid member such as an aluminum die cast, and its base end is fixed to the rotary shaft 21 and the tip protrudes obliquely upward. A torsion bar 70 capable of accumulating and releasing elastic force in the torsional direction through a rotating shaft (not shown) is provided on the lower surface of the central part of the hypotenuse of the support base 3.

  The seat receiver 4 is formed into a planar shape by a metal member such as aluminum so as to support the shell 61 of the seat portion 6, and an elbow for attaching the armrest 9 to the left and right sides of the seat receiver 4. A scissors mounting portion 44 (see FIG. 7) is provided.

  The link element 7 a is a plate-like member having one end rotatably attached to the front of the support base 3 via the rotary shaft 30 and the other end rotatably attached to the front back surface of the seat receiver 4 via the support shaft 74. is there.

  One end of the link element 7b is fixed to the rotation shaft of the torsion bar 70 provided at the center of the hypotenuse of the support base 3, and the other end is rotatably connected to the rotation shaft 79 provided on the rear end side of the seat 4. Normally, the lower backrest frame 50 and the upper backrest frame 55 described above are integrally fixed to the link element 7b in a state where the rotation function around the rotation shaft 72 is stopped, and the torsion bar 70 together with the link element 7b. It can rotate around the rotation axis.

  The gas spring 31 is provided between the link element 7a and the support base 3, and locks the entire four-sided link mechanism by selectively fixing the link element 7a.

  Further, the backrest upper tilting mechanism R functions by allowing the backrest upper frame 55 to rotate around the rotation shaft 72, and specifically includes a lock mechanism r and a spring member 73. .

  As shown in FIG. 3, the locking mechanism r includes a hole 77 provided above the link element 7b, a hole 551 provided in a bracket 550 having a generally rhombic shape in side view attached to the backrest upper frame 55, The pin 76 is disposed at a position straddling both the hole portions 77 and selectively lifted from the hole portion 551 to release the restraint between the backrest upper frame 55 and the link element 7b. Inside the bracket 550 located inside the lower end of the backrest upper frame 55, a bracket 7b1 having the same shape is provided so as to be integrated with the link 7b. The brackets 550 and 7b1 are overlapped to form the hole 551. The hole 77 is positioned inside and the pin 76 is inserted. Thus, in a state where the pin 76 is inserted into both the hole portions 77 and 551, the link element 7b and the backrest upper frame 55 are restrained and move integrally, and the pin 76 is pulled out from the hole portion 551. Thus, the above restraint is released so that only the backrest upper frame 55 can independently rotate about the rotation shaft 72.

  The spring member 73 is for imparting elasticity to the backrest upper frame 55 when tilted, and presses the backrest upper frame 55 in the standing direction.

  Further, the lower backrest tilting mechanism S utilizes the lower backrest frame 50, and a gas spring (not shown) is provided at a position where the lower backrest frame 50 can be pressed forward with the rotating shaft 72 as a fulcrum.

  Thus, at the front end of the seat receiver 4, levers 43a, 43b, 43c are provided as shown in FIG. 7 in order to selectively utilize the above mechanisms P to S with the seat 6 attached. It is provided. The lever 43a is for raising and lowering the seat 6 as shown in FIG. 4, the lever 43b is for tilting only the lower backrest frame 50 as shown in FIG. 6, and the lever 43c is shown in FIG. In this manner, the seat portion 6, the backrest upper frame 55, and the backrest lower frame 50 are interlocked and locked together. The tilting of only the backrest upper frame 55 can be performed only when not rocking, and can be performed without operating the lever.

  In the configuration as described above, the present embodiment is provided with the seat front / rear adjustment mechanism T that attaches the seat portion 6 to the seat receiver 4 so as to be movable back and forth and moves the seat portion 6 back and forth.

  As described above, the seat portion 6 comprises the cushion body 60 and the shell 61. In order to enable the shell 61 to be detachably attached to the seat receiver 4, as shown in FIG. Protruding portions 62f and 62b are provided on the front end side and the rear end side. On the other hand, the seat receiver 4 is provided with elongated holes 40f and 40b extending in the front-rear direction as shown in FIG. 7 at the corresponding positions of the projecting portions 62f and 62b. Then, by inserting the projecting portions 62f and 62b of the shell 61 into the long hole portions 40f and 40b and adopting an appropriate retaining structure on the insertion end side, the seat portion 6 can be moved back and forth with respect to the seat support 4. While permitting, the upward disengagement is regulated.

  On the other hand, the seat back-and-forth movement mechanism T is provided with the rack 41 on the upper surface of the seat receiver 4 and the pinion 63 on the lower surface of the shell 61 constituting the seat portion 6 so that the rack 41 and the pinion 63 are engaged with each other. Thus, the back-and-forth slide movement of the seat portion 6 with respect to the seat receiver 4 is guided. The racks 41 are provided in pairs at positions spaced from the center in the width direction of the seat receiver 4 in the left-right direction, and the pinion 63 is a shaft held by a shaft holding portion 64 formed on the lower surface side of the seat portion 6. 65 is formed at both end portions. That is, the seat back-and-forth moving mechanism T is configured to move the seat portion 6 back and forth with respect to the seat receiver 4 by applying an artificial operation force.

  Then, in order to selectively fix the seat 6 to a desired position in the front-rear direction, the fixing mechanism 100 shown in FIGS. 8 to 10 is provided, and a lever 110 serving as an operation unit for operating the fixing mechanism 100 is shown in FIG. Thus, it is provided at a position where it can move back and forth integrally with the seat portion 6.

  The fixing mechanism 100 includes a restriction piece 101 that selectively engages and locks with the pinion 63 through the contact and separation operation with respect to the pinion 63. The restriction piece 101 is slidably attached to a guide groove 102 formed on the lower surface side of the seat portion 6, and has a proximal end connected to one end of the wire tube 103, and is connected to the pinion 63 through a wire operation. The teeth 104 formed at the tip of the pinion 63 can be selectively meshed with the pinion 63 by moving toward and away from the horizontal direction. The restricting piece 101 is elastically pressed in a direction to engage with the pinion 63 by a spring 105 provided in the guide groove 102.

  On the other hand, the lever 110 is attached to a lever holding portion 110a provided on the lower surface of the right end portion on the front end side of the seat portion 6, and the other end side of the wire tube 103 is operably connected at that position. Sometimes, the levers 43a, 43b, 43c described above are level and are arranged with a regular pitch with the levers 43a, 43b, 43c at the front and rear positions when the seat 6 slides to the rear end side. Is provided. Then, only when the lever 110 is operated, the restricting piece 101 is retracted against the spring 105, the restricting piece 101 is detached from the pinion 63 to allow the seat portion 6 to move back and forth, and the lever 110 is moved to the lever. The seat 6 can be moved forward as indicated by an imaginary line in FIG. 6 while being separated from the front 43a.

  As described above, the chair according to the present embodiment is configured to attach the seat portion 6 to the seat receiver 4 so as to be movable back and forth. Then, a fixing mechanism 100 that selectively fixes the seat 6 to a desired position in the front-rear direction is provided, and a lever 110 that is an operation unit for operating the fixing mechanism 100 is provided at a position that can be moved back and forth together with the seat 6. It is a thing.

  For this reason, the lever 110 always moves with the back-and-forth movement of the seat 6 and does not change the relative position with respect to the seat 6. Accordingly, it is possible to maintain an operation state in which the hand is accurately touched on the seat portion 6 and a finger is appropriately placed on the lever 110, and it is possible to suitably achieve both good operability and stability of the sitting posture. Become.

  Specifically, the seat 6 is supported by the seat receiver 4 via a rack and pinion mechanism, the rack 41 is provided on the seat receiver 4 side, and the pinion 63 is seated together with the fixing mechanism 100 and the lever 110. 6 is provided on the side 6, the operation in the front-rear direction can be ensured, and at the same time the rotation of the pinion 63 is securely locked to the fixing mechanism 100 with the seat portion 6 as a scaffold, It is possible to prevent the parts from moving, and it is possible to relatively easily incorporate these parts into the seat 6 and the seat receiver 4.

  Particularly, since the fixing mechanism 100 only employs the restriction piece 101 that selectively engages with the pinion 63 through the contact / separation operation with respect to the pinion 63 and locks its rotation, a compact built-in state can be realized.

  And since the contact / separation operation | movement of the said control piece 101 is made along a horizontal direction, it is not necessary to ensure the operation space of the thickness direction between the seat receiver 4 and the seat part 6, and the fixing mechanism 100 It is possible to effectively prevent the space between the seat 4 and the seat 6 due to the presence of.

  In particular, in this embodiment, since the back-and-forth movement of the seat 6 with respect to the seat 4 is caused by an operation force artificially applied from the outside, the seat 6 is operated in the front-rear direction in the seated state. However, it is possible to perform the operation of operating the lever 110 at the same time very naturally.

  Further, the lever 110 for operating the fixing mechanism 100 is regularly arranged at the rearward movement position of the seat portion 6 together with levers 43a, 43b, 43c which are operation portions such as a locking mechanism Q provided on the seat receiver 4 side. Since it is configured, the lever 110 can be effectively operated in association with the operation of the levers 43a, 43b, and 43c, and the usability and appearance can be improved.

  The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

4 ... Seat receiver 6 ... Seat 41 ... Rack 43a, 43b, 43c ... Lever (operation part of other mechanism)
63 ... Pinion 100 ... Fixing mechanism 101 ... Restricting piece 110 ... Operation part (lever)
P ... Elevating mechanism (other mechanisms)
Q ... Locking mechanism (other mechanisms)
R ... Backrest upper tilting mechanism (other mechanisms)
S ... Lower backrest tilting mechanism (other mechanisms)

Claims (7)

It is constructed by attaching a seat part to the seat so that it can move back and forth,
A chair comprising: a fixing mechanism that selectively fixes a seat portion to a desired position in the front-rear direction; and an operation portion that operates the fixing mechanism is provided at a position where the seat portion can be moved back and forth together with the seat portion. The chair according to claim 1, wherein the seat is supported by the seat receiver via the rack and pinion mechanism, the rack is provided on the seat receiving side, and the pinion is provided on the seat portion side together with the fixing mechanism and the operation portion. . The chair according to claim 2, wherein the fixing mechanism includes a regulating piece that selectively engages and locks the pinion through a contact / separation operation with respect to the pinion. The chair according to claim 3, wherein the contact / separation operation of the regulating piece is performed along the horizontal direction. The chair according to claim 1, 2, 3, or 4, wherein the back-and-forth movement of the seat relative to the seat is caused by an operating force applied from outside. 6. The operation unit for operating the fixing mechanism, together with the operation unit of another mechanism provided on the seat receiving side, forms an array having apparent regularity at least in a predetermined front-rear position. Chairs. The chair according to claim 1, 2, 3, 4, 5, or 6, wherein the operation portion is a lever-like member that takes a substantially horizontal posture when not operated.

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