JP3334461B2 - Chair bearing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a bearing structure for a chair .

[0002]

2. Description of the Related Art For example, a bearing structure of a chair will be described with reference to FIG.
3 are formed with through holes 41 and 42 for allowing a headed pin 40 as a shaft to pass therethrough, and these through holes 41 and 4 are formed.
The bush 43 is fitted into each of the bushes 2, and the pins 40 with the heads are passed through these bushes 43.

However, according to the above-described bearing structure, a bush 43 having a size that allows the head pin 40 to easily penetrate the bush 43 is selected. A clearance occurs between the outer surface of the seat 40 and the outer surface of the seat 40. The clearance causes the head pin 40 to rattle. For example, when the user sits deeply on the seat, the seat receiver 12 is swung with respect to the support member 13. During this time, the seat receiver 12 may be slightly vibrated, resulting in discomfort to the seated person.

If the through holes 41 and 42 of the seat receiver 12 and the support member 13 are not accurately formed, not only is it difficult to penetrate the pin 40 with the head, but if the pin 40 is used with it forcibly penetrated, the head is not used. The attached pin 40 may be deformed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a bearing structure capable of supporting a shaft without play.

[0006]

According to the present invention, in order to solve the above-mentioned problems , a seat support is attached to a lower surface of a seat portion, and the seat support is provided.
Around the horizontal axis on the support member fixed to the upper end of the leg.
A support shaft for swingably mounting is fixed to the seat
The bearing that supports the support shaft is composed of a member that is closely fitted to the shaft.
Then, the support shaft is sandwiched between the bearings, and the
To store part or all of the support shaft and bearing in a state
Are formed in the support member, and the support shaft and
Push the bearing toward the support shaft while the bearing is
The chair bearing structure provided with a pressing member for pressing
Provide . Therefore, when the shaft is held between the bearings, the support shaft and a part of the bearing are inserted into the recess formed in the support member.
Alternatively, the clearance between the inner surface of the bearing and the outer surface of the shaft can be eliminated by pressing the bearing against the support shaft side with the pressing member after all the members are stored . In addition, if the configuration is such that the pressing force of the pressing member can be increased, even if the bearing is worn, the replacement time of the bearing can be delayed by applying the pressing force of the pressing member again.

[0007] A locking portion is provided which protrudes above the upper surface of the pressing member and locks and holds the pressing member from both sides in the longitudinal direction of the pressing member.
The pressing member can be mounted in the positioned state, and the locking portion can function as a buffer member at the time of contact with the seat receiver.

[0008]

1 and 2 show a movable chair, which comprises a leg 1 provided with a caster on the lower surface, and a side shape provided on an upper end portion of the leg 1. A substantially L-shaped seat 2, armrests 3 erected on both left and right sides of the seat 2, and a backrest 4 erected behind the seat 2 are configured as main members.

The leg 1 is composed of a plurality of legs 5 arranged radially and a support tube 6 provided at the center thereof. A seat 2 shown in FIG. An ascending and descending gas cylinder 7 is provided rotatably around the vertical axis. Reference numeral 8 shown in the figure is a cylindrical cover for covering the upper end of the gas cylinder 7.

A seat support 12 is screwed to the lower surface of the seat 2, and the seat support 12 is fixed to an upper end of the gas cylinder 7 via a support member 13.

As shown in FIGS. 3, 4, and 17, a support shaft 14 for attaching the seat receiver 12 to a support member 13 so as to be swingable about a horizontal axis is fixed to the seat receiver 12. A pair of upper and lower bearings 15A and 15B made of resin for supporting the support shaft 14 in a tightly fitted state are provided, and the support shaft 14 is mounted on the bearings 15A and 15A.
15B, the support member 13 is formed with a recess 13A for accommodating the support shaft 14 and the bearings 15A and 15B in the sandwiched state, and the support shaft 14 and the bearings 15A and 15B are accommodated in the recess 13A. A pressing member 16 for pressing the bearings 15A and 15B toward the support shaft 14 is provided.
A coil spring 17 is provided for urging the coil spring 3 upward to move the seat 12 by the urging force of the coil spring 17 so that the seat support 12 can be maintained in the horizontal posture shown in FIG. The support shaft 14 and the bearings 15A, 1
In addition to configuring the support member 13 so as to be able to accommodate all of the 5B, the support member 1 having a size sufficient to accommodate a part of the
3 may be configured. The bearings 15A and 15B may be formed of resin or other elastic material such as hard rubber, and may be made of any material as long as it can be tightly fitted to the support shaft 14. In the embodiment, the bearing structure of the chair is described.
The present invention can be applied to bearing structures of various mechanisms provided with B.

The seat receiver 12 is a downwardly open lid having an upper plate 12A and four side plates 12B in a vertical position facing downward on the outer peripheral edge of the upper plate 12A.
A hole 18 is formed in a portion of the 2A located above the coil spring 17, and the hole 18 is burred to displace the upper end of the coil spring 17 with respect to the upper plate portion 12A of the lid. I try not to. A vertical contact member 20 is welded to the lower surface of the upper plate portion 12A of the lid to contact a lock operation lever 19 described later to prevent the seat support 12 from moving downward.

The support member 13 is provided with a bottom plate and four side plates in a vertical position facing upward on an outer peripheral edge thereof, and a box-shaped body 21 having a small size into which the seat receiver 12 can be fitted from above. And a substantially L-shaped plate member 22 welded to the rear side in the box-shaped body 21.
9, a receiving member 23 for supporting the lower end of the coil spring 17 and an adjusting mechanism 24 for moving the receiving member 23 in the vertical direction to adjust the urging force of the coil spring 17 are provided. ing. A rear end portion 22A of the plate member 22 projects rearward from a rear end portion of the box-shaped body 21, and the rear end portion 22A of the plate member 22 is positioned above the rear end portion of the seat receiver 12. It is configured to function as a stopper that prevents movement. Reference numeral 22B shown in the figure is a cushioning material for buffer fitted into the rear end 22A of the plate member 22. Further, a cylindrical body 25 whose diameter is increased toward the lower side penetrating the plate member 22 and the box-shaped body 21 is welded to the plate member 22 and the box-shaped body 21,
The upper end of the gas cylinder 7 is fitted and fixed in the tubular body 25.

The adjusting mechanism 24 includes a stepped screw shaft 26 penetrating through the bottom plate of the box-shaped body 21, a rotating operation member 27 attached to the lower end of the screw shaft 26 so as to rotate integrally therewith,
A nut 28 screwed to the upper end of the screw shaft 26, and the receiving member 23 welded to the nut 28;
By rotating the rotation operation member 27, the screw shaft 2 is rotated.
6, the nut 28 and the receiving member 23 are moved in the vertical direction. 29 shown in the figure is
A ring-shaped member which is externally fitted to the screw shaft 26 to stop the run-out of the screw shaft 26 during the rotation operation of the rotation operation member 27;
Reference numeral 30 denotes a ring-shaped resin or rubber stopper for preventing movement of the screw shaft 26 with respect to the ring-shaped member. The reason why the nut 28 and the receiving member 23 move vertically with respect to the screw shaft 26 by the rotation of the screw shaft 26 is that the guide member 3
This is because the U-shaped contact piece 31A prevents rotation of the receiving member 23 that rotates integrally with the nut 28.

The pivotal support structure between the support member 13 and the seat receiver 12 will be described in detail, as shown in FIGS.
A front bracket 32 having a substantially U-shaped cross section which enters the front side of the support member 13 is fixed to the support member 13, and the support shaft 14 is sandwiched between the bearings 15A and 15B from above and below.
After the support shaft 14 and the bearings 15A and 15B are fitted into the front fitting 32, the plate-shaped pressing member 16 is inserted from above.
By pressing a bolt 33 through a plurality of bolt holes 16A formed in the pressing member 16 and screwing a bolt 34 to a nut 34 fixed to the lower surface of the horizontal plate portion at the front and rear ends of the front fitting 32, the bearings 15 and 15 are moved forward. By pressing against the metal fitting 32, the clearance generated between the outer surface of the support shaft 14 and the inner surfaces of the bearings 15A and 15B can be eliminated.

The front fitting 32 is, as shown in FIG.
On its lower surface, two holes 32A and two long holes 32B are formed in the longitudinal direction, and these holes 32A and the long holes 32B are formed.
The bottom plate portion having the following configuration is formed in a protruding portion that is located lower toward the rear end side with respect to the other bottom plate portion, and this protruding portion is an inclined surface that is positioned higher toward the front side, that is, the inner front surface of the bottom end of the support member 13 , The horizontal plate portions at the front and rear ends of the front fitting 32 are in a horizontal posture. Then, the front fitting 32 and the support member 13 are welded to each other at the slot 32B, and the horizontal plate portion at the front end of the front fitting 32 and the support member 1 are welded.
3 and the bottom plate of the support member 13 corresponding to the hole 32A is driven from below by a punch or the like so that the bottom plate of the support member 13 protrudes approximately half the thickness of the bottom plate. T is fitted into the hole 32A so that the front fitting 32 can be fixed to the support member 13.

The upper bearing 15A is shown in FIG.
As shown in FIG. 10 to FIG. 10, a plurality of raised portions 15a are formed on the inner surface of the support shaft 14 so as to be in contact with the outer surface thereof. In addition, the bearing 15
A hole 16B formed in the pressing member 16
And a locking portion 15c for locking and holding the pressing member 16 from both sides at both ends of the upper surface. Then, the pair of locking portions 15c, 15
c protrudes above the upper surface of the pressing member 16 so that the lower surface of the seat receiver 12 is fixed to the locking portions 15c, 15c.
By receiving at the upper end of c, the impact with the seat receiver 12 can be reduced. As shown in FIGS. 11 to 16, the lower bearing 15 </ b> B is formed in the same arch shape as the bearing 15 </ b> A, and has an inner surface that contacts the outer surface of the support shaft 14. Are formed. And
Four trapezoidal claws 15d are formed at four locations on the upper surface at both ends in the longitudinal direction of the bearing 15B. Into the four notches 15e formed in the bearing 15A, so that the positioning of the two bearings 15A and 15B in the longitudinal direction is performed.

As shown in FIGS. 1, 17 and 20, two levers projecting outward from the left and right lateral portions of the seat support 12, ie, a lock operation lever 19 and a lifting operation lever 37. Is provided. 20, the tip 37A of the lever 37 on the gas cylinder 7 side is swung downward with the support bracket 38 of the lever 37 as a fulcrum. Abuts on the upper end,
The gas cylinder 7 is operated. The lock operation lever 19 is attached to the support member 13 via a support bracket 39 so as to be rotatable about a horizontal axis.
The end on the support member 13 side is inserted into the guide member 31. The guide member 31 includes a locking portion 31B for locking and holding the lock operation lever 19 at the unlocked position, and locking portions 20A formed at two upper and lower positions of the contact member 20 of the seat receiver 12, 20B, so that the seat receiver 12 can be locked and fixed in a forwardly inclined posture and a rearwardly inclined posture. Specifically, as shown in FIG.
By locking the lock operation lever 19 to the lower locking portion 20B, the front end portion of the seat receiver 12 is fixed to the forwardly inclined position in which the front end of the seat receiver 12 is positioned downward about once with respect to the horizontal direction, as shown in FIG. And the lock operation lever 19 on the upper locking portion 20A.
Is locked, so that the front end of the seat receiver 12 can be fixed in a rearwardly inclined position in which the front end of the seat receiver 12 is located upward by about 5 degrees with respect to the horizontal direction. FIG. 17 shows a state where the seat receiver 12 is held in a horizontal posture by the urging force of the coil spring 17.

As shown in FIG. 21, a spring receiver 35 for receiving the upper end of the coil spring 17 is made of an elastic material such as urethane rubber, and a metal plate 36 is provided on the inner surface of the spring receiver 35. Even when the receiving member 23 that receives the lower end of the support member 17 is inclined, the spring support 35 is elastically deformed so that the spring supporting surface of the metal plate 36 is substantially parallel to the spring supporting surface of the receiving member 23. The plate 36 may be configured so that its posture can be changed, so that the coil spring 17 does not buckle. In addition, the seat support 1
Similarly, when the angle 2 is inclined, the spring receiver 35
Is elastically deformed, and the posture of the metal plate 36 is changed so that the spring support surface of the metal plate 36 is substantially parallel to the spring support surface of the receiving member 23.

[0020]

According to the first aspect of the present invention, the clearance existing between the inner surface of the bearing and the outer surface of the support shaft can be reliably eliminated. A chair bearing structure that can be provided. Furthermore, the support shaft and bearing are housed in the recess.
The support shaft is placed between the seat support and the support member.
Easy to assemble compared to penetrating across
In addition to this, there is no need to consider manufacturing errors.
And manufacturing advantages.

According to the second aspect, an increase in the number of parts can be avoided.
While holding the pressing member, the mounting of the pressing member
Not only can it be done much more quickly,
It can also be used as a buffer for the seat
You.

[Brief description of the drawings]

FIG. 1 is a front view of a chair.

FIG. 2 is a side view of a chair.

FIG. 3 is an exploded perspective view of a pivot portion of the support shaft.

FIG. 4 is a longitudinal sectional side view of a pivot portion of a spindle.

FIG. 5 is a plan view of an upper bearing.

FIG. 6 is a side view of the upper bearing.

FIG. 7 is a bottom view of the upper bearing.

FIG. 8 is a front view of the upper bearing.

9 is a sectional view taken along line BB in FIG.

FIG. 10 is a sectional view taken along line AA in FIG. 5;

FIG. 11 is a plan view of a lower bearing.

FIG. 12 is a side view of the lower bearing.

FIG. 13 is a bottom view of the lower bearing.

FIG. 14 is a front view of the lower bearing.

FIG. 15 is a sectional view taken along line DD in FIG. 12;

FIG. 16 is a sectional view taken along line CC in FIG. 11;

FIG. 17 is a longitudinal sectional side view showing a neutral state of a seat support.

FIG. 18 is a longitudinal sectional side view showing the seat receiver in a forwardly inclined state.

FIG. 19 is a longitudinal sectional side view showing the seat receiver in a backwardly inclined state.

FIG. 20 is a partially cutaway plan view showing a state where the seat receiver and the support member are assembled.

FIG. 21 is a longitudinal sectional side view showing another embodiment of the upper support of the coil spring.

FIG. 22 is an exploded perspective view showing a conventional example of a pivot structure of a support shaft.

[Explanation of symbols]

Reference Signs List 1 leg 2 seat 3 armrest 4 backrest 5 support 6 support cylinder 7 gas cylinder 8 cover 12 seat receiver 12A upper plate 12B side plate 13A recess 13 support member 14 support shaft 15A bearing 15B bearing 15a ridge 15b Protrusion 15c Lock 15d Claw 15e Notch 16 Pressing member 16A Bolt hole 16B hole 17 Coil spring 18 Hole 19 Lock operating lever 20 Contact member 20A Locking portion 20B Locking portion 21 Box 22 Plate member 22A Rear end 22B Cushion material 23 Receiving member 24 Adjustment mechanism 25 Cylindrical body 26 Screw shaft 27 Rotating operation member 28 Nut 29 Ring-shaped member 30 Stopper 31 Guide member 31A U-shaped contact piece 32 Front bracket 32A hole 32B Slot 33 Bolt 34 Nut 35 Spring holder 36 Metal plate 37 Lifting lever 37A Tip 38 Support bracket 39 Support bracket 40 Head pin 41 Through hole 42 Through hole 43 Bush T Projection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 11/04 A47C 7/00 F16C 11/10 F16C 27/02

Claims (2)

(57) [Claims] A seat support attached to a lower surface of the seat portion;
Place the support on the support member fixed to the upper end of the leg around the horizontal axis.
The support shaft for swingably mounting is fixed to the seat support,
The bearing for supporting the support shaft is composed of a member closely fitted to the shaft.
Then, the support shaft is sandwiched between the bearings, and the
To store part or all of the support shaft and bearing in a state
Are formed in the support member, and the support shaft and
Push the bearing toward the support shaft while the bearing is
A bearing structure for a chair provided with a pressing member for pressing. 2. A projection projecting upward from an upper surface of the pressing member.
And holds the pressing member from both sides in the longitudinal direction thereof.
The bearing structure for a chair according to claim 1, wherein a locking portion is provided on the bearing.