JP2009112382A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair for which the number of parts is small, the work of attaching and detaching a seat body to/from a post is extremely simple, and the seat body can be accurately and surely positioned and rotation-stopped to the post. <P>SOLUTION: In the chair for which the seat body 1 is attached to the upper end part of a height adjusting support 11 at the upper end of the post, the cross sectional shape of an outer peripheral surface at the upper part of the height adjusting support 11 is formed into a non-circular shape such as a regular hexagonal shape, and a tapered part 11a for settling the outer diameter of a base end inside the non-circular shape is provided at the upper end of the non-circular cross sectional part. A seat attaching member 21 for supporting the seat body 1 is provided with a tapered hole 29 to which the tapered part 11a is fitted, and a hexagonal hole (non-circular hole) 28 continued to the lower end to which the non-circular cross-sectional part is to be fitted so as not to be relatively rotated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair having a seat attached to an upper end portion of a height adjustment column.

  In a conventional chair, a tapered taper is provided at the upper and lower ends of the pedestal, and this is provided on the lower surface of the seat mounting member that supports the tapered hole provided in the center of the upper surface of the base leg and the seat body. In many cases, it is fitted into a taper hole so that a pedestal is supported on the base leg and a seat mounting member is supported on the upper end of the pedestal (see, for example, Patent Document 1).

In addition, the upper end of the pedestal (support shaft) is loosely inserted into the tube shaft suspended from the lower surface of the seat mounting member (base for seat seat mounting), and a T-shaped notch is formed on the outer periphery of the lower end of the tube shaft. The seat mounting member is prevented from rotating with respect to the pedestal by tightening the lower end portion of the tube shaft below the notch with fastening means comprising a fastening box, a screw, and a stator. Yes (see Patent Document 2, for example).
JP-A-6-14822 Japanese Utility Model Publication No. 46-7257

  However, in what is described in Patent Document 1, there is a possibility that the seat body may rotate with respect to the pedestal, and the front and rear direction of the seat body with respect to the pedestal cannot be accurately positioned. This is not suitable when the front / rear direction of the seat body with respect to the pedestal must be accurately positioned, such as a chair with the pedestal tilted backward and the seat body horizontal.

  In what is described in Patent Document 2, it is possible to stop the rotation of the seat mounting member with respect to the pedestal by tightening the tightening means, but the number of parts is large and the structure becomes complicated. There are problems such as high costs.

  In view of the above-mentioned problems of the prior art, the present invention has a small number of parts, and is very easy to attach and detach the seat to and from the pedestal. It is an object of the present invention to provide a chair that can be reliably positioned and stopped.

According to the present invention, the above problem is solved as follows.
(1) In a chair in which a seat is attached to the upper end of the height adjusting column at the upper end of the pedestal, the cross-sectional shape of the outer peripheral surface of the upper part of the height adjusting column is made non-circular, and the upper end of the non-circular sectional unit A taper hole in which the tapered diameter is fitted to the seat body or a seat mounting member that supports the seat body, A non-circular hole is provided which is continuous with the lower end and into which the non-circular cross section is fitted so as not to be relatively rotatable.

  (2) In the above paragraph (1), it is assumed that the pedestal and the height adjusting support are inclined backward, and the seat body is substantially horizontal or inclined forwardly downward.

  (3) In the above item (2), at the middle part or upper part of the pedestal, it expands in the left-right direction toward the rear in plan view, and inclines toward the rear lower part so that the lower end touches the floor. Provide a pair of left and right rear legs.

  (4) In any one of the above items (1) to (3), the outer shape of the non-circular cross-sectional portion is a regular hexagon, and the non-circular hole is a regular hexagonal hole substantially complementary to the non-circular hole.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the non-circular cross section of the height adjusting column is fitted into the non-circular hole provided in the seat body or the seat mounting member that supports the seat body, and the seat body or the seat that supports the seat body. By simply press-fitting the tapered taper portion of the height adjustment strut into the tapered hole provided in the mounting member, the seat body is accurately and reliably positioned and rotationally stopped at the upper end portion of the height adjustment strut. The seat body can be easily attached, and the seat body can be easily detached from the upper end portion of the height adjusting column only by lifting the seat body upward from the upper end portion of the height adjusting column.
In addition to the pedestal and the seat, many parts such as the fastening means in Patent Document 2 are not required, and the number of parts can be reduced.

According to the second aspect of the present invention, since the pedestal and the height adjusting column are inclined backward and the seat body is substantially horizontal or inclined forwardly, the load on the seated person and the seat body is high. Since the seat is inclined with respect to the center axis of the height adjustment column, that is, the taper taper and the center axis of the non-circular hole, the seat is less likely to come off the height adjustment column.
Further, in such a configuration, the seat body intersects the height adjustment column at an angle other than a right angle. Therefore, when the orientation of the seat body changes, the seat body cannot be kept horizontal and faces downward. In some cases, the non-circular cross-section of the height adjustment post fits into the non-circular hole provided in the seat or the seat mounting member that supports it, preventing such fluctuations in the orientation of the seat. can do.

According to the third aspect of the present invention, the left and right sides of the pedestal that are widened in the left-right direction toward the rear in plan view and inclined rearward and downward so that the lower end touches the floor in the middle or upper part of the pedestal. Since there is a pair of rear legs, the rear legs can be attached to the pedestal in advance, and the seat can be attached to the height adjustment strut assembled to the upper end of the pedestal. The mounting of the seat to the head and the entire assembly work are simple.
Moreover, since the left and right rear legs are attached to the pedestal so as to expand in the left-right direction toward the rear in plan view, the stability of the seat body is good.

  According to the invention described in claim 4, since the outer shape of the non-circular cross-sectional portion is a regular hexagon and the non-circular hole is a regular hexagonal hole substantially complementary to the non-circular hole, manufacturing is easy and the appearance is good.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1 to FIG. 3, this chair has a pedestal 2 that is a front leg that tilts backward with a seat 1 attached to the upper end and the lower end is in contact with the floor, and an intermediate portion of the pedestal 2. Alternatively, a pair of left and right rear legs 3, 3 whose upper end is fixed to the upper part and which expands in the left-right direction toward the rear in plan view and is inclined toward the rear lower part, so that the lower end contacts the floor. It has.

  In this example, each rear leg 3 is provided with a pair of upper and lower leg rods 4 and 5 which are attached to two places where the upper ends are spaced apart in the vertical direction on the pedestal 2 and whose lower ends are coupled to each other.

  As shown in FIG. 3, the forward tilt angle θ1 of the rear leg 3 is larger than the rear tilt angle θ2 of the pedestal 2 so that it does not easily fall backward.

  Synthetic resin floor contact members 6 and 7 are fitted to the lower ends of the pedestals 2 and the rear legs 3 from below.

The pedestal 2 includes a height adjustment mechanism 8 that can adjust the height of the seat body 1 by expanding and contracting, and the height adjustment range of the seat body 1 by the height adjustment mechanism 8 is as follows. As shown by an imaginary line in FIG. 3, when the seat body 1 is lowest, the seat body 1 is located behind the lower end of the pedestal 2, and as shown by a solid line in FIG. When it does, it restrict | limits so that the seat 1 may be located ahead from the lower end of the rear legs 3 and 3. FIG.
As a result, this chair is always stable no matter how the height of the seat 1 is changed, so that it does not fall down in any of the front-rear and left-right directions. In addition, the left-right falling is prevented by the left and right rear legs 3, 3 extending so as to expand in the left-right direction toward the rear from the pedestal 2.

As shown in FIGS. 4 and 5, the pedestal 2 includes a cylindrical outer cylinder 9 and a gas spring 10 that constitutes a height adjusting mechanism 8.
The gas spring 10 includes a gas cylinder that functions as a height adjustment column 11 and a piston rod 12 that can be advanced and retracted from one end thereof, and pushes a push button 13 provided at the other end of the gas cylinder, that is, the height adjustment column 11. Only when the piston rod 12 is moving, the piston rod 12 can freely advance and retreat, and is biased in the advancing direction by the gas pressure inside the gas cylinder, and when the push button 13 is located at the protruding position, the piston rod 12 It is a publicly known device that cannot advance or retreat.

  The gas spring 10 has a front end portion of a piston rod 12 fixed to a center of an end plate 14 that closes a lower end portion of the outer cylinder 9 with a bolt and a nut 15, and a height adjusting column 11 is attached to the outer cylinder 9. A bearing member 16 fitted from the upper end of the outer cylinder 9 is slidable in the axial direction, and is assembled to the outer cylinder 9 so as to protrude coaxially from the upper end of the outer cylinder 9.

  The cross-sectional shape of the outer peripheral surface of the height adjusting column 11 is a regular hexagon (or may be a non-circular shape including other polygons), and the upper end has a maximum diameter smaller than the inscribed circle of the regular hexagon. A taper taper portion 11a is continuously provided, and the push button 13 is provided on the tip surface of the taper taper portion 11a.

  As shown in FIG. 7, the bearing member 16 is continuous with the cylindrical portion 17 facing in the vertical direction, the enlarged diameter flange portion 18 provided at the upper end of the cylindrical portion 17, and the lower surface of the enlarged diameter flange portion 18. In addition, a rotation-preventing convex portion 19 that protrudes from the front and rear portions of the outer peripheral surface of the cylindrical portion 17 is provided.

  As shown in FIGS. 7 and 8, the cylindrical portion 17 is formed by connecting a plurality of (six in this example) thick portions 17a facing in the longitudinal direction to each other with flexible thin portions 17b. The overall shape is almost circular.

The outer surface of the thick portion 17a is formed in an arc shape that complements the inner surface of the outer cylinder 9, and the inner surface of the thick portion 17a complements the outer peripheral surface of the height adjusting column 11 that is a shaft member. That is, it is a plane that is complementary to the plane of the regular hexagonal straight line portion of the outer peripheral surface of the height adjusting column 11.
When there is no need to prevent the height adjusting column 11 from rotating, the outer peripheral surface of the height adjusting column 11 may be circular, and the inner surface of the thick portion 17a may be an arc shape that complements it.

  The cross-sectional shape of the thin portion 17b is an arc shape with the convex portion facing outward, and a concave portion is formed inside the thin portion 17b.

  The bearing member 16 has a diameter-expanded flange portion 18 that abuts on the upper end of the outer cylinder 9 and a convex portion 19 that fits into square notches 20 formed at the front and rear edges of the upper end of the outer cylinder 9. Then, the cylinder portion 17 is fitted into the upper end portion of the exterior cylinder 9 by being press-fitted into the exterior cylinder 9.

When the cylindrical portion 17 is press-fitted into the outer cylinder 9, the thin portion 17b is elastically deformed, and the cylindrical portion 17 is reduced in diameter as a whole, but the thickness of the thick portion 17b does not vary, so that the bearing The shape of the inner surface of the member 16 after press-fitting can be accurately predicted.
Therefore, the fitting when the height adjusting column 11 is fitted in the bearing member 16 is not tight.

  Further, when the height adjustment column 11 is fitted into the bearing member 16, each regular hexagonal corner portion of the outer periphery of the height adjustment column 11 is loosely fitted into the recess inside the thin portion 17 b of the bearing member 16, Since the regular hexagonal straight portion does not come into contact with the inner surface of the bearing member 16 and only comes into sliding contact with the inner surface of the thick wall portion 17a, the height adjustment support column does not concentrate stress on each corner of the regular hexagon. 11 can smoothly slide in the axial direction in the bearing member 16 while being prevented from rotating.

  In order to prevent the bearing member 16 from coming out of the outer cylinder 9, the bearing member 16 may be screwed (not shown) to the outer cylinder 9 as necessary.

As shown in FIG. 5, a seat mounting member 21 that supports the seat body 1 is attached to the upper end portion of the height adjustment column 11 that protrudes upward from the bearing member 16.
The seat mounting member 21 includes a substantially horizontal base plate part 22, a cylinder part 23 extending from the substantially center of the lower surface thereof to the front and lower side with the same rearward tilt angle as that of the pedestal 2, and the base board part 22. A handle 24 for carrying the chair that extends rearward and downward from the rear end, and protrudes upward at the four corners of the upper surface of the substrate portion 22, and supports the seat body 1 at the upper end, whereby the substrate portion 22 and the seat body 1 And four protrusions 25 that are spaced apart in the vertical direction.

A rectangular recess 26 is provided in the center of the upper surface of the substrate portion 22, and a groove 27 having a substantially U-shaped cross section is provided on the upper surface of the substrate portion 22 so as to cross the front portion of the recess 26 in the left-right direction. It has been.
Further, from the lower end of the cylindrical portion 22 to the bottom surface of the concave portion 26, a hexagonal hole (non-circular hole) 28 complementary to the hexagonal outer peripheral surface of the height adjusting column 11 and a tapered taper portion 11a of the height adjusting column 11 are provided. A taper hole 29 having the same taper as that of the taper and expanding downward is continuously provided.

Thus, the seat mounting member 21 is attached to the height adjustment column 11 by fitting the hexagonal outer peripheral portion of the height adjustment column 11 into the hexagonal hole 28 and fitting the tapered portion 11 a into the taper hole 29. It is attached with being prevented from rotating.
In a normal use state or carrying state, the seat mounting member 21 is not detached from the height adjusting column 11 only by fitting the tapered portion 11a and the tapered hole 29. It is clear from the relationship between the base and the leg.

  Therefore, the seat mounting member 21 can be mounted simply by fitting the hexagonal outer peripheral portion of the height adjusting column 11 into the hexagonal hole 28 provided in the seat mounting member 21 and fitting the tapered portion 11a into the tapered hole 29. In addition, it can be easily attached to the upper end portion of the height adjustment column 11 while being accurately and reliably positioned and rotationally stopped, and the seat mounting member 21 can be removed from the upper end portion of the height adjustment column 11. .

  In addition, the hexagonal hole 28 and the taper hole 29 may be directly provided in the seat body 1, and the seat body 1 may be directly attached to the height adjustment column 11 without using the seat attachment member 21.

  When the seat attachment member 21 is attached to the upper end portion of the height adjustment column 11, the tip of the taper taper portion 11 a and the push button 13 are located in the recess 26 of the seat attachment member 21, The push button 13 is pushed by the operation piece 31 welded to the central portion of the operation shaft 30 facing the direction.

  The operation shaft 30 has a pair of left and right bearing members 32, 32 fitted in the concave groove 27, and is pivotally supported by the seat mounting member 21, and has both end portions protruding to both sides of the seat mounting member 21. The push button 13 can be pushed by the operating piece 31 by turning upward one of the handle portions 30a, 30a formed by bending forward.

  As shown in FIG. 5 and FIG. 6, each bearing member 32 squeezes the operating shaft 30 at the lower end of a flexible U-shaped squeeze piece 33 and squeezes in that state. After fitting the piece 33 into the concave groove 27 from above, a pair of attachment pieces 34, 34 connected to the upper end of the rubbing piece 33 are brought into contact with the upper surface of the board portion 22 and screwed. Thus, the seat mounting member 21 is easily and reliably attached.

  The seat body 1 is a known structure having a horizontal rectangular shape in a plan view in which a cushioning material is superimposed on an upper surface of a seat plate that is substantially horizontal and has a front portion slightly tilted downward and covered with a skin material (detailed illustration thereof). The seat mounting member 21 is mounted on the four projections 25 of the seat mounting member 21 with bolts (not shown) passing through the projections 25. It is fixed to.

  As shown in FIGS. 1, 5, and 6, the handle 24 in the seat mounting member 21 has an arc shape in plan view, and the rear end thereof is substantially aligned with the rear end of the seat body 1 in the vertical direction, or Therefore, the handle 24 is not likely to collide with other objects, and the aesthetic appearance can be enhanced.

  In addition, since the handle 24 is formed integrally with the seat mounting member 21, the number of parts is not increased, and the chair can be carried stably by placing a hand on the handle 24 from below. .

  Further, since the handle 24 is disposed below the seat body 1, the handle 24 does not affect the seating feeling, and the swinging of the chair during carrying can be reduced. Sometimes, it is possible to prevent a chair leg or the like from colliding with another object.

  As is clear from the above, in this embodiment, the hexagonal hole 28 provided in the seat mounting member 21 is fitted with the regular hexagonal cross-sectional portion of the height adjusting column 11 and the taper provided in the seat mounting member 21 is provided. By simply press-fitting the tapered taper portion 11a of the height adjustment column 11 into the hole 29, the seat body 1 can be easily and accurately positioned and securely stopped at the upper end portion of the height adjustment column 11. The seat body 1 can be easily detached from the upper end portion of the height adjustment column by simply lifting the seat body 1 upward from the upper end portion of the height adjustment column 11.

The present invention is not limited to the above-described embodiment, and can be implemented in various modified forms.
For example, the rear legs 3 and 3 can be formed by only one leg rod.

It is the perspective view which looked at one embodiment of the present invention from the slanting back. Similarly, it is a front view. Similarly, it is a side view. Similarly, it is a center vertical side view of the pedestal. Similarly, it is a center longitudinal cross-sectional side view of the attachment part of a pedestal and a seat. Similarly, it is the perspective view seen from diagonally backward in the state which removed the seat. Similarly, it is a perspective view of a bearing member. Similarly, it is a cross-sectional plan view of the cylindrical portion of the bearing member.

Explanation of symbols

1 Seat 2 Pillar (front leg)
3 Rear legs 4, 5 Leg rod 6, 7 Floor contact member 8 Height adjustment mechanism 9 Exterior cylinder 10 Gas spring 11 Height adjustment support (cylinder, shaft member)
11a Tapered taper portion 12 Piston rod 13 Push button 14 End plate 15 Bolt / nut 16 Bearing member 17 Tube portion 17a Thick portion 17b Thin portion 18 Expanded flange portion 19 Convex portion 20 Notch 21 Seat mounting member 22 Substrate portion 23 Tube Portion 24 Handle 25 Protrusion 26 Recess 27 Recess groove 28 Hexagonal hole (Non-circular hole)
29 Tapered hole 30 Operating shaft 31 Actuating piece 32 Bearing member 33 Gripping piece 34 Mounting piece

Claims (4)

In a chair with a seat attached to the upper end of the height adjustment column at the upper end of the pedestal,
The cross-sectional shape of the outer peripheral surface of the upper part of the height adjustment column is made non-circular, and a tapered taper part is provided at the upper end of the non-circular cross-sectional part so that the outer diameter of the base end is within the non-circular part. A taper hole in which the tapered taper portion is fitted into the body or a seat mounting member that supports the body, and a non-circular hole that is continuous with the lower end of the body and is fitted in such a manner that the non-circular cross-sectional portion cannot be relatively rotated. A chair characterized by providing.   The chair according to claim 1, wherein the pedestal and the height adjusting column are inclined backward, and the seat body is substantially horizontal or inclined forwardly.   A pair of left and right rear legs, which expand in the left-right direction toward the rear in a plan view and are inclined toward the rear lower side so that the lower end is in contact with the floor, are provided in the middle or upper part of the pedestal. Item 2. The chair according to Item 2.   The chair according to any one of claims 1 to 3, wherein the outer shape of the non-circular cross-sectional portion is a regular hexagon, and the non-circular hole is a regular hexagon hole that substantially complements the non-circular hole.

Images