JP5111881B2 - Chair - Google Patents

Description

  The present invention relates to a chair formed by pivotably mounting a horizontal shaft of a seat support frame that supports a seat on a support base provided on an upper portion of a leg.

In reclining chairs, etc., where the rear part of the seat tilts downward in conjunction with the back tilt of the backrest, the recumbent facing the left and right sides of the front part of the seat support frame that supports the seat is It is often pivotally attached to a support base provided at the upper part (see, for example, Patent Document 1).
JP 2003-245154 A

In the chair described in the above-mentioned Patent Document 1, a horizontal groove at the front part of the seat support frame is sandwiched by a bearing from above and below in a concave groove formed on the upper surface of the support base and facing in the left-right direction, and By holding the upper and lower bearings with presser fittings screwed to the upper surface of the support base, the recumbent pivot is pivotally attached to the front part of the support base so as to be able to rotate up and down.
Therefore, there are problems that the number of parts is large and the cost is high, and that it takes time to install the seat support frame.

  The present invention has been made in view of the above problems, and by reducing the number of parts of the member for attaching the seat support frame to the support base, the cost can be reduced and the seat support frame can be easily attached. The purpose is to provide a chair that is made up of.

According to the present invention, the above problem is solved as follows.
(1) The seat support frame for supporting the seat body has front and rear sideways facing in the left-right direction, and left and right side frames facing in the front-rear direction coupled to both end portions thereof, and the upper part of the leg In a chair that is pivotally attached to the support base provided so that the seat support frame can be pivoted up and down around the front support. A receiving portion having a supporting hole that opens upward in a size that can be inserted and that has a larger diameter than the opening and that faces in the left-right direction is provided, and a horizontal rod is loosely fitted into the supporting hole of the receiving portion through the opening. In addition, a non-cylindrical bearing having a part opened in the circumferential direction is fitted to the front side of the front part by elastically deforming in the diameter-enlarging direction, and this bearing is supported by the support hole of the receiving part. Fit from side to side.

(2) In the above item (1), the lower end of the seat support arm is pivotally mounted on both the left and right sides of the support base so as to be rotatable about the left and right axis, and the receiving portion is provided on the upper end of the both seat support arm. .

(3) In the above item (1) or (2), the spacer is fitted between the lateral frames between the left and right side frames and the left and right outer surfaces of the receiving portion.

(4) In any one of the above items (1) to (3), a detent means for preventing relative rotation between the receiving portion and the bearing is provided.

(5) In the above item (4), the anti-rotation means is an upward protruding piece that protrudes upward from the opening of the bearing and engages by engaging with the opening of the receiving portion from the side.

(6) In the above item (5), an engagement groove is provided on one of the opposing surfaces of the opening of the receiving portion and the upward projecting piece, and an engagement projection that engages with the engagement groove is provided on the other side.

According to the first aspect of the present invention, the recumbent of the front portion of the seat support frame is loosely fitted from above into the support hole provided in the receiving portion of the support base and having an upper opening, and elastically deformed into the recumbent By simply fitting the fitted bearing into the support hole from the side, the front side of the seat support frame can be pivotally attached to the support base while preventing it from coming off upward. There is no need for a bearing pressing member or a screw for fixing the holding member to the support base.
As a result, the number of parts is reduced, the cost can be reduced, and the work of attaching the seat support frame to the support base is facilitated.

According to the invention of claim 2, since the receiving portion is provided at the upper end portion of the seat support arm with the lower end portion pivotally attached to both side portions of the support base, the shape of the support base can be simplified. The cost of a mold or the like when molding it with synthetic resin is reduced.
In addition, the seat support arm can be pivoted back and forth around the left and right axis with respect to the support base, so when the seat support frame is linked so as to be interlocked with the back tilt of the backrest, the seat support frame The supported seat body can be moved largely backward with the backrest, and the sitting comfort is improved.

  According to the third aspect of the present invention, it is possible to prevent the recumbent of the front part from moving in the left-right direction with respect to the support base, and it is possible to eliminate the possibility that the bearing is disengaged outward from the support hole of the receiving part.

  According to the invention described in claim 4, since the inner peripheral surface of the support hole of the receiving portion and the outer peripheral surface of the bearing do not slide relative to each other, wear on both surfaces can be prevented.

  According to the fifth aspect of the present invention, the upward projecting piece is provided only in the opening of the bearing, and this is fitted into the opening of the receiving portion from the side, so that the relative rotation between the receiving portion and the bearing can be achieved. It can be easily prevented.

  According to the sixth aspect of the present invention, the bearing is prevented from coming off sideways from the support hole of the receiving portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a side view of a chair to which the present invention is applied, FIG. 2 is an exploded perspective view of a main part of the chair, and FIG. 3 is a perspective view of a state where a backrest support frame and a seat support frame are attached to a support base. It is.

The chair 1 includes a leg body 2, a seat body 3 provided at an upper portion thereof, a backrest 4, and a pair of left and right armrests 5.
The leg body 2 includes five leg rods 7 having a radial shape with a caster 6 attached to the tip thereof, and a leg column 8 that can be extended and contracted by a gas spring (not shown) that is erected in the center and accommodated in the center. And a support base 9 having a rear end portion rotatably attached to the upper end thereof.

The seat body 3 includes a synthetic resin seat plate 10 and a cushion material 11 attached to the upper surface thereof, and is supported by a metal seat support frame 12.
The backrest 4 is composed of a backrest support frame 13 made of hard synthetic resin and a backrest 14 attached to the upper front portion thereof.

  Metal reinforcing plates 15 and 15 are attached to the opposing surfaces of the pair of left and right support arms 13a and 13a at the lower end of the back support frame 13 and face the left and right directions supported by the support base 9. A rectangular hole 17 at the front end portion of the reinforcing plate 15 and a rectangular mounting hole 18a provided at the pivoting portion 18 facing the left and right directions of the front ends of both support arms 13a are formed in the square shaft portions 16a at both end portions of the pivot shaft 16. The backrest support frame is fitted by screwing the nut 19 from the outside of the large-diameter hole 18b of the pivoting portion 18 to the screw shaft 16b that fits in a relatively unrotatable manner and protrudes to the side of the square shaft portion 16a. Reference numeral 13 is pivotally attached to both sides of the support base 9 so as to be rotatable in the vertical direction. Reference numeral 20 denotes a cap that closes the open end of the large-diameter hole 18b of both pivot attachment portions 18.

The pivot 16 is linked to a forward biasing means (not shown) provided inside the support base 9, and the backrest support frame 13 is biased in a direction in which it always stands up by the forward biasing means, And it can be tilted backward against the biasing means.
The left and right armrests 5 are attached to the upper surfaces of the front end portions of the left and right support arms 13a.

  The seat support frame 12 is parallel to each other in the left-right direction, and has a plurality of front and rear (21 in the present embodiment) horizontal rods 21 made of steel pipes or the like whose side ends are bent slightly upward. It consists of a pair of left and right side frames 22, 22 that form a generally upward U shape in front view, with both front and rear ends fixed to both side ends of the flange 21 by welding, and the seat support frame 21 as a whole is seen in plan view. It is formed in a substantially rectangular frame shape.

Of the three recumbent ridges 21, the two recumbent ridges 21 on the rear side are arranged close to each other.
Both end portions of each horizontal bar 21 are fixed in a state where substantially upper half portions thereof are fitted into cutout grooves 23 formed in the lower ends of the left and right side frames 22, and the lower ends of the horizontal bars 21 are It protrudes slightly below the lower end of the side frame 22.

  The left and right side frames 22 are slidably fitted in recesses 24 and 24 formed on the lower surfaces of the left and right sides of the seat plate 10 in the front-rear direction so as to be slidable in the front-rear direction. In contrast, it can move in the front-rear direction.

  A support shaft 25 facing in the left-right direction is pivotally attached to the front end portion in the support base 9, and seat support arms 26 made of synthetic resin facing in the up-down direction are provided on the left and right projecting end portions 25a, 25a. , 26 is fitted in such a manner as to be incapable of relative rotation.

As shown in an enlarged view in FIGS. 5 to 7, at the upper end portion of the both seat support arm 26, there is a notched cylindrical receiving portion 26 b having a notched circular support hole 28 having an opening 27 in the left and right direction. Are integrally formed. The dimension between the opposed surfaces of the opening 27 is slightly larger than the outer diameter so that the horizontal bar 21 is inserted from above, and the inner diameter of the support hole 28 is the same as the outer peripheral surface of the horizontal bar 21. It is sufficiently larger than the outer diameter so that a required gap is formed therebetween.
Engagement grooves 27 a and 27 a that are recessed in the circumferential direction are formed on the outer end of the facing surface of the opening 27.

A pair of notched cylindrical bearings 29 made of synthetic resin having wear resistance made of polyacetal or the like, which is partially opened in the circumferential direction, is formed in the horizontal portion of the front horizontal bar 21 in the seat support frame 12; 29 is fitted in such a manner that it can be relatively rotated and slidable in the left-right direction from the circumferential direction of the horizontal flange 21 by being elastically deformed in the diameter expanding direction.
The left and right dimensions of the bearing 29 are substantially the same as that of the receiving portion 26b, and the outer diameter is a dimension that can be properly fitted into the support hole 28.

  At the opening of the bearing 29, a pair of front and rear upward protruding pieces 29a, 29a facing upward that can be fitted from the side into the opening of the receiving portion 26b are projected, and the upper ends of the outer end portions of the both upward protruding pieces 29a. In this case, engaging protrusions 29b and 29b that can be engaged with both the engaging grooves 27a of the receiving portion 26b are provided to protrude outward.

A synthetic resin spacer 30 is fixed to the vicinity of the bent portion 21 a of the horizontal collar 21 between the outer surface of the receiving portion 26 b and the inner surface of the side frame 22 in the left and right seat support arms 26.
The spacer 30 is fitted in a bent portion 21a between the receiving portion 26b and the side frame 22, and is a semi-cylindrical portion 30a facing slightly upward and slightly larger than a semicircle, and perpendicular to the inner end edge thereof. Are connected to the lower portion of the outer edge of the semi-cylindrical portion 30a and the lower surface of the side frame 22 is below the lower surface of the side frame 22. By engaging with the lower surface of the bent portion 21 a that protrudes toward the bottom, the upper end has a detent portion 30 c that can contact the lower surface of the side frame 22.

  In order to attach the front end portion of the seat support frame 12 to the left and right seat support arms 26, first, as shown in FIG. ) Is loosely fitted into the support holes 28 of the receiving portions 26b of the left and right seat support arms 26 from above through the openings 27.

  Next, the bearing 29 fitted to the horizontal flange 21 is slid outward while reducing the diameter, and is fitted into the opening 27 and the support hole 28 of the receiving portion 26b as shown in FIG. At this time, the engaging protrusions 29b protruding from the two upward protruding pieces 29a enter the engaging grooves 27a of the receiving part 26b and engage with each other.

Accordingly, the horizontal bar 21 is rotatably supported by the bearing 29, and the bearing 29 is prevented from rotating with respect to the receiving portion 26b and is prevented from coming off upward.
Further, since the engagement protrusion 29b is engaged with the engagement groove 27a, the bearing 29 is also prevented from coming off inward from the support hole 28.

  Next, as shown in FIGS. 3 and 6, when the spacer 30 is fitted to the bent portion 21 a between the left and right receiving portions 26 b (only one is shown) and the side frame 22 in the horizontal cage 21, And the front side of the seat support frame 12 is prevented from moving in the left-right direction with respect to the left and right seat support arms 26 and the support base 9, and the bearing 29 is located outward from the support hole 28. It is also prevented from coming off.

  As shown in FIG. 2 and FIG. 3, both side end portions of the horizontal portion of the horizontal bar 21 at the rearmost portion of the seat support frame 12 are divided into two U-shaped bearings 31, 31 fitted into that portion. The holding metal fittings 32, 32 are held by screws, and the holding metal fittings 32 are screwed onto the inward horizontal piece 15b of the seat support portion 15a having an inverted L-shape in front view, which is connected to the rear portions of the left and right reinforcing plates 15. Is fixed to the left and right support arms 13a, 13a of the back support frame 13 so as to be pivotable.

  As described above, in the chair of the above embodiment, the seat support frame 12 having the upper end opened to the upper end of the pair of left and right seat support arms 26 pivotally attached to the support base 9 at the lower end. A receiving portion 26b having a support hole 28 having a diameter larger than that of the horizontal flange 21 and facing in the left-right direction is provided. Both side ends of the horizontal flange 21 are loosely fitted to the left and right receiving portions 26b from above, and The bearing 29 fitted by being elastically deformed from the circumferential direction is slid sideways and fitted into the support hole 28 of the receiving portion 26b. 21 can be pivotally attached to the support base 9 while preventing it from coming off upward, so that a presser fitting and a fixing screw for the bearing 29 are not required.

Therefore, the number of parts can be reduced and the cost can be reduced, and the work of attaching the seat support frame 12 to the support base 9 can be facilitated.
In addition, since the spacers 30 are fitted to the lateral ribs 21 between the left and right side frames 22 and the receiving portions 26b, the front end portion of the seat support frame 12 is left and right with respect to the support base 9 after mounting. It does not move in the direction.

  In the above-described embodiment, the receiving portions 26b for receiving and supporting both sides of the front horizontal bar 21 are provided on the seat support arm 26 pivotally attached to the both sides of the support base 9, but the support base 9 It may be provided directly on the upper surface of both sides.

  In order to prevent the bearing 29 from rotating relative to the receiving portion 26b, an upward projecting piece 29a that fits into the opening 27 of the receiving portion 26b is provided at the opening, but the support hole 28 of the receiving portion 26b is provided. In addition, if the bearing 29 is tightly press-fitted, the upward projecting piece 29a can be omitted. Further, instead of providing the upward projecting piece 29a, rotation preventing means such as a concave shape and a protruding line that are fitted in each other in the left-right direction may be provided on the inner surface of the support hole 28 and the outer peripheral surface of the bearing 29.

The engagement groove 27a and the engagement protrusion 29b that prevent the bearing 29 from coming off from the support hole 28 may be provided on the opposite surface of the opening 27 and the intermediate portion in the left-right direction of the upward protrusion 29a, respectively. In this way, the bearing 29 is prevented from coming off to the left and right sides of the support hole 28.
In contrast to the above embodiment, an engagement protrusion may be provided on the opening 27 side, and an engagement groove may be provided on the upward protrusion 29a side.

It is a side view of the chair to which one embodiment of the present invention is applied. Similarly, it is a disassembled perspective view of the principal part of a chair. Similarly, it is a perspective view of the principal part of the state which attached the backrest support frame and the seat support frame to the support base. Similarly, it is a front view. It is a perspective view in the state where a horizontal collar was inserted into the support hole of the seat support arm. Similarly, it is a perspective view of the state which fitted the bearing in the support hole of the seat support arm, and attached the spacer. It is the VII-VII line enlarged vertical end view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair 2 Leg 3 Seat 4 Backrest 5 Armrest 6 Castor 7 Leg 8 Leg Pillar 9 Supporting Base 10 Seat Plate 11 Cushion Material 12 Seat Support Frame 13 Back Support Frame 13a Support Arm 14 Backing 15 Reinforcement Plate 15a Seat Support portion 15b Inward horizontal piece 16 Pivot 16a Square shaft portion 16b Screw shaft 17 Square hole 18 Pivoting portion 18a Mounting hole 18b Large diameter hole 19 Nut 20 Cap 21 Reclining 21a Bent portion 22 Side frame 23 Notch groove 24 Recess 25 Support shaft 25a Projecting end portion 26 Seat support arm 26a Inward cylindrical portion 26b Receiving portion 27 Opening 27a Engaging groove 28 Supporting hole 29 Bearing 29a Upward projecting piece 29b Engaging projection portion 30 Spacer 30a Semi-cylindrical portion 30b Hook 30c Stopping part 31 Bearing 32 Holding bracket 33 Screw

Claims (6)

The seat support frame that supports the seat body has front and rear sideways facing in the left-right direction, and left and right side frames facing in the front-rear direction coupled to both end portions thereof, and is provided on the upper portion of the leg body. In a chair that is pivotally attached to the base so that the seat support frame can pivot up and down around the recumbent at the front part,
The support base is provided with a receiving portion having a support hole that opens upward in a size that allows the horizontal reed to be inserted and that has a larger diameter than the opening and faces in the left-right direction. A horizontal hook is loosely fitted through the opening, and a non-cylindrical bearing having a part opened in the circumferential direction is fitted into the front horizontal hook by being elastically deformed in the diameter increasing direction. A chair characterized in that a bearing is fitted into the support hole of the receiving portion from the side.   The chair according to claim 1, wherein the lower end portion of the seat support arm is pivotally attached to both left and right sides of the support base so as to be rotatable around the left and right axis, and a receiving portion is provided at the upper end portion of the both seat support arms.   The chair according to claim 1 or 2, wherein a spacer is fitted in a reed between the left and right side frames and the left and right outer surfaces of the receiving portion.   The chair according to any one of claims 1 to 3, further comprising anti-rotation means for preventing relative rotation between the receiving portion and the bearing.   The chair according to claim 4, wherein the rotation preventing means is formed as an upward protruding piece that protrudes upward from the opening of the bearing and engages by engaging with the opening of the receiving portion from the side.   The chair according to claim 5, wherein an engagement groove is provided on one of opposing surfaces of the opening of the receiving portion and the upward projecting piece, and an engagement projection that engages with the engagement groove is provided on the other side.

Images