JP2008194523A - Seat forward and backward sliding device for chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat forward and backward sliding device for a chair which is easily operated and can keep the stable position after adjustment. <P>SOLUTION: The guide rails 13 are provided in a front and rear direction at the right and left sides of a support base 5 attached to the upper end of a leg post 4 of a chair 1. Mobile rails 20 arranged at the lower right and left sides of a seat 7 are attached to the guide rails 13 so as to be slidable forward and backward. Engagement parts 25 to be engaged are disposed at the outside 13e of the right and left guide rails along the longitudinal direction in a front and rear direction. A lever member 27 which is rotatable around an axis in the front and rear direction and has engagement parts 26 engaged with the engagement parts 25 to be engaged is attached to the right and left mobile rails. The right and left lever members 27 are elastically biased in the engagement direction of the engagement parts 26 with the engagement parts 25 to be engaged and rotated against the elastic bias. Releasing the right and left engagements enables an adjustment of the sliding position in the front and rear direction of the seat. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a back-and-forth slide device for a seat in a chair.

A chair in which the backrest tilts backward due to the load of a seated person leaning on the backrest and the seat moves back and forth in conjunction with the backrest is known.
The applicant of the present application has dealt with the popularization of OA devices in recent years, and, for example, when using a keyboard of a personal computer on a desk, finely adjusts the front and rear positions of the seat with respect to the backrest and the armrest, regardless of the back tilt of the backrest. In order to improve the sitting comfort of the seated person and improve the work efficiency of the desk work, a patent application has been filed for an invention that can easily adjust the front and rear position of the seat with a simple mechanism. (Patent Document 1 Reference Open 2002-136376).
JP 2002-136376 A

  In addition to the above-mentioned object, the present invention provides an easy-to-operate operation for adjusting the front / rear position of the seat, and can stably hold the adjusted position. It is an object of the present invention to provide a front / rear sliding device.

According to the present invention, the above problem is solved as follows.
(1) Guide rails are provided in the front-rear direction on the left and right sides of the base attached to the upper end of the pedestal in the chair, and movable rails provided on the lower left and right sides of the seat are attached to the guide rails so that they can slide back and forth. The left and right guide rails are provided with engaged portions along the longitudinal direction in the front-rear direction, and the left and right movable rails are provided with engaging portions that engage with the engaged portions, respectively. The lever member is attached so as to be pivotable about the axis in the front-rear direction, and the left and right lever members are elastically urged in the direction in which the engaging portion and the engaged portion are engaged, and the elastic urging is resisted. Then, by rotating both lever members to release both the left and right engagement states, it is possible to adjust the sliding position of the front and rear positions of the seat. A device.

(2) In the above item (1), the engaged portion is provided with a plurality of vertical engaging grooves in the front-rear direction on the outer side surface of the guide rail.

(3) In the above item (2), the lever member is composed of a plate-like lever handle and a pivot shaft in the front-rear direction provided at the upper end of the mounting plate standing on the lever handle. Is attached to the movable rail so as to be rotatable, and an engaging portion is provided on the inner end surface of the lever handle.

(4) In the above item (3), a fixed handle is provided on the movable rail so as to be paired with a plate-like lever handle on the lever member, and the lever member is rotated against the elastic bias. When moving, both the fixed handle and the lever handle can be used to easily release the engaged state.

According to the present invention, the following effects can be obtained.
(1) According to the first aspect of the invention, when adjusting the front / rear position of the seat, the left and right lever members are rotated together so that the engaged state of the engaging portion and the engaged portion is simultaneously changed. Or after stepwise releasing both the left and right engagement states, the seat can be slid to a desired front and rear position, and the seat is slid to a desired front and rear position, and then the left and right levers Since the lever portion is elastically biased by a simple operation of simply releasing the member, the adjusted position can be stably held.

  (2) According to the invention described in claim 2, it is possible to easily provide an engaged portion that can be easily engaged with the engaging portion and can stably hold the front and rear positions of the seat after adjustment. Can be formed.

  (3) According to the invention described in claim 3, when adjusting the front / rear position of the seat, a lever member that is easy to operate and that can be easily and reliably engaged with the engaged portion is easily formed. be able to.

  (4) According to the invention described in claim 4, the operation for adjusting the front-rear position of the seat can be further facilitated.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 and 2 are a front view and a side view, respectively, of a chair provided with a seat front and rear sliding device according to an embodiment of the present invention.
3 is a cross-sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a vertical cross-sectional view taken along the line IV-IV in FIG.

As shown in FIGS. 1 and 2, this chair is provided with a gas spring (not shown) in the center of a leg (3) having a leg rod (2) provided with a caster (1) at the tip. A pedestal column (4) is erected, and the rear portion of the support base (5) is fixed to the upper end of the pedestal column (4).
Biasing means for returning the backrest (6) and the seat (7) are provided inside the support base (5).

At both ends of the support shaft (8) projecting left and right from the both side walls (5a) and (5a) of the support base (5), a pair of left and right backs that are substantially L-shaped in side view supporting the backrest (6) The cylindrical part (9a) (9a) facing the left-right direction provided in the front end part of the back support bar (9) (9) is fitted, and the back back (6) and the back support bar (9) (9) Is integrated with the support shaft (8) and can be tilted rearward and downward.
An armrest (10) is provided upright in the middle of the forward portion at the lower part of the left and right backrest support rods (9).

  An upward seat support rod (11) is integrally provided at an intermediate portion between the cylindrical portion (9a) and the armrest (10) of the left and right backrest support rods (9).

  As shown in FIG. 5 which is a longitudinal sectional view taken along line V-V in FIG. 2 and FIG. 3, the upper and lower ends of the seat support rods (11) are connected to each other by a horizontal rod (12). The rear ends of the pair of left and right guide rails (13) facing in the direction are connected with a shaft (14) facing in the left-right direction.

  The front end portions of the left and right guide rails (13) and (13) are side walls of the support base (5) as shown in FIG. 6, which is a longitudinal sectional view taken along line VI-VI in FIGS. (5a) The inner surface of the upper end of the left and right support links (16) (16), which are pivotally attached to the outside of the outwardly facing cylinders (15) (15) provided at the front of (5a) Are connected with a horizontal axis (17) facing left and right. Thus, the two support brackets, the seat support rod (11) and the support link (16), which support the front and rear ends of the guide rail (13), abut one support bracket against the inner side surface of the guide rail (13). The other support fitting is supported in contact with the outer side surface of the guide rail (13).

  A lower end portion of the support link (16) is pivotally attached to the outside of the cylindrical portion (15) with a horizontal axis (18) facing in the left-right direction, and is provided by a torsion coil spring provided in the cylindrical portion (15). 2 is urged counterclockwise in FIG.

  When the backrest (6) and the backrest support rods (9) and (9) are tilted rearward and downward about the support shaft (8), the backrest support rods (9) and (9) at that time are integral seats. The rear part of the seat (7) is moved rearward and downward by the rearward tilting of the support rods (11) and (11), and in conjunction therewith, the front part of the seat (7) is also moved to the left and right support links (16) ( 16) can be moved slightly rearward and downward by tilting backward against the biasing force of the torsion coil spring.

  The left and right guide rails (13) and (13) have short leg seats (19) and (19) projecting from the lower surface of the seat (7), and the front and rear ends are fixed and separated from the seat (7). A pair of left and right movable rails (20) and (20) facing the front-rear direction are mounted so as to be slidable in the front-rear direction.

  As shown in FIG. 4, the short leg seats (19) and (19) projecting from the lower surfaces of the front and rear ends of the seat (7) are provided with female screw holes (19a) in the vertical direction. The front and rear ends of the movable rail (20) are screwed to the lower surface by bolts (21) and (21) inserted from below.

  As shown in FIGS. 5 and 6, the guide rail (13) has a U-shaped cross-section with outward flanges (13a) (13a) on the left and right sides of the upper end, and the inner center of the U-shaped groove (13b). Further, a support piece (13c) in the front-rear direction having a height of about two thirds of the depth of the groove is provided upright. As shown in FIG. 4, columnar stoppers (13d) and (13d) are provided in the vicinity of the front and rear ends of the support piece (13c).

  As shown in FIGS. 5 and 6, the movable rail (20) has a shape in which an inverted trapezoidal fitting part (20a) protrudes from the lower side of a substantially horizontally long cross section, as shown in FIG. As shown, long slide holes (20b) and (20b) are formed in the vicinity of the front and rear end portions before and after penetrating in the vertical direction.

  A sliding sheet (22) with low sliding resistance is interposed between the guide rail (13) and the movable rail (20) so that the movable rail (20) slides smoothly on the guide rail (13). To get.

  The sliding sheet (22) has a low-profile U-shaped section with outward flanges (22a) (22a) on the left and right sides of the upper end, and the left and right flanges (22a) (22a) are guided rails. It is placed on the upper surface of the left and right flanges (13a) and (13a) of (13) and is fitted to the upper part of the U-shaped groove (13b) of the guide rail (13). The stopper (13d) of the guide rail (13) is inserted into the through hole (22b) (22b) that is supported by the support piece (13c) of 13) and is drilled in the vicinity of the front and rear ends of the sliding seat (22). By doing so, it is fixed on the guide rail (13).

  The movable rail (20) has an inverted trapezoidal fitting portion (20a) projecting from the lower surface thereof fitted into the U-shaped groove (22c) of the sliding seat (22) and the guide rail (13 ) Front and rear stoppers (13d) and (13d) are respectively passed through the front and rear slide holes (20b) and (20b), and then bolts (23) and (20) are inserted into the female screw holes provided in the stoppers (13d) and (13d). 23) is screwed together.

The diameter of the head (23a) (23a) of the bolt (23) (23) is larger than the width of the slide hole (20b) of the movable rail (20), so that the movable rail (20) becomes the guide rail (13). It is made not to come off from.
The movable rail (20) can slide smoothly back and forth within the range of the length of the slide hole (20b).

  Between the guide rail (13) and the movable rail (20), there is provided a position adjusting device for adjusting the seat (7) by sliding it to a desired position in the front-rear direction and then fixing the seat (7) at that position.

FIG. 7 is a partially enlarged perspective view of the lower part in the broken-line ellipse in FIG.
The position adjusting device (24) includes an engaged portion (25) provided on the guide rail (13) and the engaged portion (25) provided at a substantially central portion in the front-rear direction of the movable rail (20). ) And a lever member (27) having an engaging portion (26) engaged therewith.

FIG. 8 is an exploded top perspective view of the main part of the position adjusting device (24) in FIG.
9 and 10 are a longitudinal sectional view taken along line IX to IX and a longitudinal sectional view taken along line X to X in FIG. 7, respectively.

  The engaged portion (25) is formed by providing a plurality of vertical engaging grooves (25a) in the front-rear direction on the outer side surface (13e) of the guide rail (13).

  The lever member (27) includes a plate-shaped lever handle (28), a mounting plate (29) erected on the inner end thereof, and a pivot shaft in the front-rear direction provided on the upper end of the mounting plate (29) ( 30).

  On the inner end surface (28a) of the lever handle (28), a plurality of engaging projections (28b) arranged in parallel in the front-rear direction are engaged with a part of the engaging groove (25a) of the engaged portion (25). ), And the outer end (28c) is curved outward so that it can be easily handled as a handle.

  Above the lever member (27) in the substantially central portion of the movable rail (20) in the front-rear direction, the lever handle (28) is paired with the outer end (28c) of the lever handle (28). A fixed handle (31) having substantially the same shape is provided so as to project outward. A concave portion (32) having a rectangular shape in plan view is provided at a position on the upper surface of the movable rail (20) where the fixed handle (31) is provided. Of the bottom surface (33) of the concave portion (32), the outer side The end is provided with an opening (34) that is long in the front-rear direction for allowing the rotation shaft (30) of the lever handle (28) to pass therethrough, and before and after the opening (34) of the rotation shaft (30). Support grooves (35) and (35) having a semicircular cross section for rotatably supporting both ends are provided.

  After the pivot shaft (30) of the lever handle (28) is supported in the support groove (35) (35), the recess (32) is covered with a cap (36). Near the outer end of the back surface of the cap (36) is provided a semicircular groove (37) that opens downward to complement the semicircular groove of the bearing groove (35) (35). The groove (37), in combination with the support groove (35), supports the rotation shaft (30) of the lever handle (28) so as to be rotatable with a stable position.

  The cap (36) is fixed by inserting a bolt (38) into each through hole (39) and screwing it into the female screw hole (39a) of the bottom surface (33) of the recess (32).

  Locking cylinders (41) into which the lower portions of the coil springs (40) can be fitted are provided on the front and rear sides of the upper surface of the lever handle (28), respectively, and the coil springs (40 ) (40) is provided with locking recesses (42) and (42) for locking the upper ends of them.

  The upper and lower ends of the lever handle (28) are shown in FIG. 10 by the action of the locking recess (42) and the coil springs (40) (40) fitted and locked to the locking cylinder (41). As shown in the figure, the engaging portion (26) of the lever handle (28) is engaged with the engaged portion (25) of the guide rail (13). Match.

  To adjust the front / rear position of the seat (7), for example, place the thumb of the hand on the upper surface of the fixed handle (31) and the other finger on the lower surface of the lever handle (28), as shown in FIG. The lever handle (28) is rotated around the rotation shaft (30) against the elastic bias by the coil springs (40) and (40), thereby releasing the engaged state and moving the movable rail (20 ) On the guide rail (13) through the sliding seat (22), the front and rear positions of the seat (1) can be easily adjusted.

  After adjusting the position, when the hand is released from the lever handle (28), the lever handle (28) is again engaged with the engaging portion (26) of the lever handle (28) by the action of elastic bias of the coil spring (40). Is engaged with the engaged portion (25) of the guide rail (13), and the front and rear positions of the seat (7) are fixed at that position.

It is a front view of a chair provided with the back-and-forth sliding device of the seat of one embodiment of the present invention. Similarly, it is a side view of the chair. FIG. 3 is a cross-sectional view taken along line III to III in FIG. 1. FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG. 1. Similarly, it is the VV line longitudinal cross-sectional view in FIG. Similarly, it is the VI-VI line longitudinal cross-sectional view in FIG. It is a downward perspective partial enlarged view in the broken-line ellipse in FIG. It is an upper perspective exploded view of the principal part of the position adjusting device in FIG. Similarly, it is the IX-IX line longitudinal cross-sectional view in FIG. Similarly, it is an X-X line longitudinal cross-sectional view in FIG. 7, and shows a state where the engaging portion of the lever handle is engaged with the engaged portion of the guide rail. FIG. 11 is a view similar to FIG. 10, showing a state where the engagement between the engaging portion of the lever handle and the engaged portion of the guide rail is released.

Explanation of symbols

(1) Caster
(2) Legs
(3) Leg
(4) pedestal
(5) Support base
(5a) Side wall
(6) Backrest
(7) Seat
(8) Support shaft
(9) Back support
(9a) Tube part
(10) Armrest
(11) Seat support rod
(12) Yokohama
(13) Guide rail
(13a) Buttocks
(13b) U-shaped groove
(13c) Support piece
(13d) Stopper
(13e) Outer side
(14) Axis
(15) Tube part
(16) Support link
(17) (18) Horizontal axis
(19) Leg seat
(19a) Female screw hole
(20) Movable rail
(20a) Mating part
(20b) Slide hole
(21) Bolt
(22) Sliding sheet
(22a) Buttocks
(22b) Through hole
(22c) U-shaped groove
(23) Bolt
(23a) Head
(24) Position adjustment device
(25) Engaged part
(25a) Engaging groove
(26) Engagement part
(27) Lever member
(28) Lever handle
(28a) Inner end face
(28b) Engagement protrusion
(28c) Outer end
(29) Mounting plate
(30) Rotating shaft
(31) Fixed handle
(32) Recess
(33) Bottom
(34) Opening
(35) Bearing groove
(36) Cap
(37) Semicircular groove
(38) Bolt
(39) Through hole
(39a) Female screw hole
(40) Coil spring
(41) Locking cylinder
(42) Locking recess

Claims (4)

Guide rails are provided in the front-rear direction on the left and right sides of the support base attached to the upper end of the pedestal in the chair, and the movable rails provided on the lower left and right sides of the seat are attached to the guide rails so as to be slidable back and forth, A lever member provided with an engaged portion on the outer side surface of the guide rail along the longitudinal direction in the front-rear direction, and provided with an engaging portion that engages with the engaged portion on each of the left and right movable rails. The left and right lever members are elastically urged in a direction in which the engaging portion and the engaged portion are engaged, against the elastic urge, A front / rear sliding device for a chair in a chair, wherein both the left and right engagement states are released by rotating both lever members to enable sliding adjustment of the front / rear position of the seat. 2. The seat front and rear sliding device according to claim 1, wherein the engaged portion is provided with a plurality of vertical engaging grooves in the front-rear direction on the outer side surface of the guide rail. The lever member is composed of a plate-like lever handle and a pivot shaft in the front-rear direction provided at the upper end of the mounting plate erected on the lever handle. The pivot shaft is pivotally attached to the movable rail. The front and rear of the seat in the chair according to claim 2, wherein an engagement portion comprising an engagement protrusion that engages with a part of the engagement groove of the engaged portion is provided on an inner end surface of the lever handle. Sliding device. A fixed handle is provided on the movable rail so as to be paired with the plate-like lever handle of the lever member above the lever member, and when the lever member is rotated against the elastic bias, the fixed handle and the lever handle 4. The seat back-and-forth sliding device for a chair according to claim 3, wherein the engagement state can be easily released using both of them.

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