JP5133448B2 - Chair - Google Patents

Description

  The present invention relates to 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 recent spread of office automation equipment, and finely adjusts the front and rear positions of the seat with respect to the backrest and armrests, for example, when using a personal computer keyboard on a desk, 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 see).

JP 2002-136376 A

  In addition to the above object, the present invention provides a chair that is easy to operate when adjusting the front and rear position of the seat and that can stably hold the adjusted position. For the purpose.

According to the present invention, the above problem is solved as follows.
(1) A leg support, a supporting base fixed to the leg, and a backrest supporting rod in which a pair of left and right front ends are pivotally attached to the supporting base with a supporting shaft in the left-right direction on both sides of the supporting base. A backrest supported and tiltable in the front-rear direction with respect to the support base, a guide rail connected to the support base and provided above the support base, and mounted on the guide rail so as to be slidable in the front-rear direction And an armrest having a lower end fixed to a forward portion of a lower portion of the backrest support rod below the guide rail .

(2) In the above item (1), armrest, digits intermediate set of front direction of the backrest support rod in a side view substantially L-shaped.

(3) In the above item (1) or (2), the front part of the guide rail is directed to the upper end of the support link pivotally attached to the lower part of the support base , and the rear part of the guide rail is directed upward from the back support rod. to the upper end portion of the projecting been seat supporting rod, their linked by pivoted with an axis oriented in the respectively left and right directions, so that the when tilting the backrest to the rear downward seat provoking moved rearward downward To.

(4) In any one of the above items (1) to (3), the seat is fixed to a movable rail that is slidably attached to the guide rail in the front-rear direction, and the seat is interposed between the movable rail and the guide rail. the after adjusting is slid to a desired position in the longitudinal direction, Ru provided the position adjusting device for fixing at the position.

According to the present invention, the following effects can be obtained.
According to the invention of the above (1) , a chair is provided which is easy to operate when adjusting the front and rear position of the seat and can stably hold the adjusted position. can do.

According to the invention of the above item (2) , the armrest is fixed to the middle of the forward portion at the lower part of the backrest supporting rod having a substantially L shape in side view.

According to the invention of the above (3) , when the backrest supporting heel is tilted rearward and downward, a chair is obtained in which the seat moves in the rearward and downward direction in conjunction therewith.

According to the invention of the above (4), the operation for adjusting the front and rear position of the seat can be further facilitated.

It is a front view of the chair 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.

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 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 has a telescopic leg 4 having a gas spring (not shown) at the center of a leg 3 having a leg 2 with a caster 1 provided at the tip. The rear portion of the support base 5 is fixed to the upper end of the pedestal 4 while standing.
A biasing means for returning the backrest 6 and the seat 7 is provided inside the support base 5.

Front end portions of a pair of left and right backrest support rods 9 and 9 that are substantially L-shaped in side view and support the backrest 6 at both ends of the support shaft 8 projecting to the left and right from both side walls 5a and 5a of the support base 5. The back portion 6 and the backrest supporting rod 9 are integrated with the support shaft 8 and can be tilted rearward and downward. .
At the middle of the forward portion at the lower part of the left and right backrest support rods 9, the tip of the inwardly facing portion of the lower end portion of the armrest 10 is fixed .

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

  2 and FIG. 5, which is a vertical sectional view taken along the line V-V in FIG. 3, left and right facing the front-rear direction connected to each other by a horizontal rod 12 on the outer surface of the upper end of each seat support rod 11. The rear end portions of the pair of guide rails 13 are connected with a shaft 14 facing in the left-right direction.

  The front ends of the left and right guide rails 13, 13 are in front of the side walls 5a, 5a of the support base 5, as shown in FIG. 6, which is a longitudinal sectional view taken along line VI-VI in FIGS. Are connected to the inner surfaces of the upper ends of the left and right support links 16, 16 that are pivotally attached to the outer sides of the outwardly facing cylinder portions 15, 15 provided in the portion, with a horizontal shaft 17 that faces in the left-right direction. . As described above, the two support fittings of the seat support rod 11 and the support link 16 that support the front and rear ends of the guide rail 13 abut one support fitting against the inner side surface of the guide rail 13 and the other support fitting to the guide rail. 13 is supported in contact with the outer side surface.

  The lower end portion of the support link 16 is pivotally attached to the outside of the cylindrical portion 15 with a horizontal shaft 18 facing in the left-right direction, and is rotated counterclockwise in FIG. 2 by a torsion coil spring provided in the cylindrical portion 15. It is energized.

  When the backrest 6 and the backrest support rods 9, 9 are tilted rearward and downward about the support shaft 8, the seat support rods 11, 11 integrated with the backrest support rods 9, 9 at that time are tilted backward, The rear part of the seat 7 is moved rearward and downward, and the front support part of the seat 7 is also tilted rearward against the biasing force of the torsion coil spring. It can be moved slightly rearward and downward.

  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 end portions are fixed, and a pair of left and right movable members facing the front and rear direction away from the seat 7. Rails 20 are mounted so as to be slidable in the front-rear direction.

  As shown in FIG. 4, the short leg seats 19, 19 projecting from the lower surface of the front and rear ends of the seat 7 are provided with a female screw hole 19 a in the vertical direction, and on the lower surface of the movable rail 20. The front and rear end portions are screwed 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 having outwardly extending flange portions 13a and 13a on the left and right sides of the upper end, and the depth of the groove in the center of the U-shaped groove 13b. A support piece 13c in the front-rear direction having a height of approximately two-thirds of the height 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 portion 20 a protrudes from the lower side of a substantially horizontally long cross section, and as shown in FIG. 4, 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.

  Between the guide rail 13 and the movable rail 20, a sliding sheet 22 having a low sliding resistance is interposed so that the movable rail 20 can slide on the guide rail 13 smoothly.

  The sliding sheet 22 has a low-profile U-shaped cross section with outward flange portions 22a, 22a on the upper left and right sides, and the left and right flange portions 22a, 22a are connected to the left and right flange portions 13a of the guide rail 13, It is placed on the upper surface of 13a and fitted into the upper part of the U-shaped groove 13b of the guide rail 13, and the center of the lower surface is supported by the support piece 13c of the guide rail 13, and the front and rear end portions of the sliding seat 22 The stopper 13d of the guide rail 13 is inserted into the through holes 22b and 22b drilled in the vicinity, so that the guide rail 13 is fixed.

  The movable rail 20 is fitted with an inverted trapezoidal fitting portion 20a projecting on the lower surface thereof in the U-shaped groove 22c of the sliding sheet 22, and the front and rear stoppers 13d and 13d of the guide rail 13 are The front and rear slide holes 20b and 20b are respectively penetrated, and then bolts 23 and 23 are screwed into the female screw holes provided in the stoppers 13d and 13d.

The diameters of the heads 23 a and 23 a of the bolts 23 and 23 are made larger than the width of the slide hole 20 b of the movable rail 20 so that the movable rail 20 is not detached from the guide rail 13.
The movable rail 20 can be smoothly slid 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 it 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 an engaging portion 26 provided at a substantially central portion in the front-rear direction of the movable rail 20 to engage with the engaged portion 25. And a lever member 27 having the same.

FIG. 8 is an upper exploded 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 25 a in the front-rear direction on the outer side surface 13 e of the guide rail 13.

  The lever member 27 includes a plate-like lever handle 28, a mounting plate 29 erected on the inner end thereof, and a front-rear rotation shaft 30 provided on the upper end of the mounting plate 29.

  The inner end face 28a of the lever handle 28 is provided with an engaging portion 26 that includes a plurality of engaging protrusions 28b arranged in parallel in the front-rear direction to engage with a part of the engaging grooves 25a of the engaged portion 25. The outer end 28c is curved outward so that it can be easily handled as a handle.

  A fixed handle 31 having substantially the same shape as the outer end 28c of the lever handle 28 is formed above the lever member 27 at a substantially central portion in the front-rear direction of the movable rail 20 so as to form a pair with the lever handle 28. It protrudes outward. A concave portion 32 having a rectangular shape in a plan view is provided on the upper surface of the movable rail 20 at the position where the fixed handle 31 is provided, and the lever handle 28 is rotated at the outer end of the bottom surface 33 of the concave portion 32. A long opening 34 in the front-rear direction for inserting the shaft 30 is provided, and a support groove 35 having a semicircular cross section for rotatably supporting both ends of the rotation shaft 30 before and after the opening 34, 35 is provided.

  After the pivot shaft 30 of the lever handle 28 is supported in the support grooves 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 grooves of the support grooves 35, 35. Combined with 35, the pivot shaft 30 of the lever handle 28 is supported so as to be pivotable with a stable position.

  The cap 36 is fixed by inserting bolts 38 into the respective through holes 39 and screwing into the female screw holes 39a of the bottom surface 33 of the recess 32.

  Locking cylinders 41 capable of fitting the lower portions of the coil springs 40 are provided on the front and rear of the upper surface of the lever handle 28, respectively, and the upper ends of the coil springs 40, 40 are locked on the lower surface of the fixed handle 31. Recessed holes 42 and 42 are provided.

  As shown in FIG. 10, the lever handle 28 is rotated in the front-rear direction by the action of the locking recesses 42 and the coil springs 40, 40 fitted and locked to the locking cylinder 41, respectively. The engaging portion 26 of the lever handle 28 is engaged with the engaged portion 25 of the guide rail 13 by being elastically biased around the shaft 30.

  In order to adjust the front / rear position of the seat 7, for example, the thumb of the hand is applied to the upper surface of the fixed handle 31, and the other finger is applied to the lower surface of the lever handle 28. As shown in FIG. The engagement state is released by rotating around the rotation shaft 30 against the elastic biasing by the springs 40, 40, and the movable rail 20 is moved over the guide rail 13 via the sliding sheet 22. The front and rear positions of the seat 1 can be easily adjusted by sliding the.

  After the position is adjusted, when the hand is released from the lever handle 28, the lever handle 28 is again engaged with the engaged portion of the guide rail 13 by the action of the elastic bias of the coil spring 40. The front and rear positions of the seat 7 are fixed at the positions.

DESCRIPTION OF SYMBOLS 1 Caster 2 Leg rod 3 Leg body 4 Pillar 5 Pillar 5a Side wall 6 Backrest 7 Seat 8 Support shaft 9 Backrest support rod 9a Tube portion 10 Armrest 11 Seat support rod 12 Horizontal rod 13 Guide rail 13a Rift portion 13b U-shape Groove 13c Support piece 13d Stopper 13e Outer side surface 14 Shaft 15 Tube portion 16 Support link 17, 18 Horizontal shaft 19 Leg seat 19a Female screw hole 20 Movable rail 20a Fitting portion 20b Slide hole 21 Bolt 22 Sliding seat 22a Rift portion 22b Through hole 22c U-shaped groove 23 Bolt 23a Head 24 Position adjusting device 25 Engagement part 25a Engagement 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 Concave portion 33 Bottom surface 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 concave hole

Claims (4)

Legs and
A support base fixed to the leg,
On both sides of the support base, a pair of left and right front end portions are supported by a back support rod pivotally attached to the support base with a support shaft in the left and right direction, and a backrest tiltable in the front-rear direction with respect to the support base; ,
A guide rail connected to the support base and provided above the support base;
A seat mounted on the guide rail so as to be slidable in the front-rear direction;
A chair comprising: an armrest having a lower end fixed to a forward portion of a lower portion of the backrest supporting heel below the guide rail .   The chair according to claim 1, wherein an armrest is provided in the middle of a front portion of a back support rod having a substantially L shape in side view.   The front part of the guide rail is at the upper end part of the support link pivotally attached to the lower part of the support base, and the rear part of the guide rail is at the upper end part of the seat support bar protruding upward from the backrest support bar. The chair according to claim 1 or 2, wherein the chair is pivotally attached with a shaft facing in the left-right direction and connected so that the seat can be moved rearward and downward when the backrest is tilted rearward and downward.   The seat is fixed to a movable rail attached to the guide rail so as to be slidable in the front-rear direction, and is adjusted by sliding the seat to a desired position in the front-rear direction between the movable rail and the guide rail. The chair in any one of Claims 1-3 which provided the position adjustment apparatus for fixing in a position.

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