JPH0411558Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a chair with adjustable seat height that is widely used for learning or office purposes.

[Prior Art] This type of chair has, for example, a plurality of extensible columns including an inner column member and an outer column member,
The inner column member of this column is erected on the base via a lower mounting bracket, and a wooden seat is supported at the upper end of the outer column member via a seat bracket. There are known devices in which the sitting height can be adjusted.

[Problems to be solved by the invention] However, in such a structure, the support must be made of metal due to its function. Therefore, threaded members such as bolts must be used at the connection between the upper end of the support and the seat, or between the support and the base. Moreover, in chairs with multiple supports, the supports are often located near the outer edge of the chair. Therefore, there is a high possibility that the head of a bolt or the like is visible and exposed at a location where it is likely to come into contact with people's skin or clothing. However, the head of a bolt etc. has a groove for engaging the tip of a tightening tool such as a screwdriver, and the opening edge of this groove has a burr-like portion mainly caused by plastic deformation during tightening. Sometimes. Therefore, this burr-like portion tends to cause inconveniences such as damaging the skin or catching clothes. Having the head of the bolt exposed to the outside is not a desirable design.Furthermore, the exposed part of the bolt becomes rusty and unsightly after years of use. There is a problem that it becomes easy to adhere to the surface.

Further, in the structure in which the inner column member is fixed to the base portion as described above, the lower side of the column is thin, resulting in a lack of stability. Therefore, in such a device, a structure is adopted in which the lower mounting bracket is made wider than the inner column member and both ends are fixed to the base part with screw members, and the screw members in this part are particularly Easily exposed to the outside. For this reason, some chairs of this type are equipped with a cover on the lower half of the support, but conventional covers have problems such as insufficient fixation or complicated structure that makes assembly difficult. .

The present invention aims to solve all of the above-mentioned problems.

[Means for solving the problem] In order to achieve the above purpose, the present invention
The following configuration is adopted.

That is, the chair according to the present invention has a plurality of expandable and retractable columns consisting of an inner column member and an outer column member, and the inner column member of the column is erected on the base via the lower mounting bracket. , the seat height can be adjusted by supporting a wooden seat at the upper end of the outer column member via a seat bracket, and the seat is screwed from the inside of the seat through the seat bracket and onto the seat frame side. a screw member for fixing the seat and fixing the seat to the column, a screw member for fixing the column provided through the lower mounting bracket and fixing it to the inner column member of the column and the base part, and fixing the column. a cover attached to the pillar so as to cover the fixing part of the screw member for use in the support; A channel material that is connected to the plate material so as to be slidable up and down and hides the screw member for fixing the plate material and cooperates with the plate material to surround the support column; and a channel material that is attached to the upper end of the channel material and the plate material. A cap for fixing the channel material to a plate material.

[Function] According to this configuration, the screw members for fixing the seat are located inside the seat frame, the screw members for fixing the column are hidden by the cover, and the screw members for fixing the plate are hidden by the cover. The screw member will be hidden by the channel material of the cover. Therefore, none of the screw members are exposed to any surface other than the lower surface of the seat or leg.

Further, the cover can be assembled by sliding the channel material to a predetermined position after fixing the plate material with a screw member for fixing the plate material, and then attaching the cap. In this way, the fixing part of the screw member for fixing the column and the head of the screw member for fixing the board can be hidden by the cover, and this cover can be securely fixed to the column. .

[Example] Hereinafter, an example in which the present invention is applied to a learning chair will be described with reference to the drawings.

As shown in FIG. 1, this chair has a support 3 erected on the base 2 of a leg 1, a seat 4 supported at the upper end of the support 3, and crossbars 5 attached to both sides of the seat 4. A backrest 6 is provided between the upper ends of these crossbars 5.

More specifically, the leg 1 includes a pair of support columns 3 erected on both sides of the upper surface of the base portion 2 . The pillar 3 is a telescopically slidable combination of an inner pillar member 31 and an outer pillar member 32.
A lower mounting bracket 33 having a U-shaped cross section is fixed to the lower end of the outer column member 32, and a seat bracket 34 having an L-shaped cross section is fixed to the upper end of the outer column member 32.
A horizontal member 7 is installed between the upper end portions of the two. In this embodiment, an elevating position adjustment mechanism (not shown) for changing the vertical relative positions of the inner column member 31 and the outer column member 32 is built into the column 3, and the horizontal A transmission mechanism (not shown) for raising and lowering the seat 4 by transmitting the rotational operating force applied to the operating handle 8 to the lifting position adjustment mechanism is housed inside the frame member 7 .

The seat 4 is made by attaching a wooden seat frame 42 to the lower peripheral edge of a plywood top plate 41.
A covering material 43 is stretched on the outer surface of the seat frame 42 via a cushion material (not shown). A notch 44 is provided in the middle portion of both sides of the seat frame 42. This notch 44 is formed by partially removing the seat frame material, and the horizontal member 7 is located within this notch 44.

The backrest 6 has a core material (not shown) surrounded by an upholstery material 61 with a cushion material interposed therebetween.

This backrest 6 and each of the crossbars 5 are joined by dowels 62. That is, as shown in FIG. 2, cylindrical dowels 62 are provided protrudingly on both side surfaces 63 of the backrest 6, and engagement holes 51 are formed in portions corresponding to the dowels 62 on the inner surface 53 of the crossbar 5. A dowel 62 is press-fitted into the engagement hole 51 to connect the backrest 6 and the crossbar 5. It is of course possible to use an adhesive between the backrest 6 and the crosspiece 5 if necessary.

Further, these crossbars 5 are fixed to both sides of the seat 4 by screw members 52 for fixing the crossbars. That is, as shown in FIG. 3, a bolt hole 45 is bored in the seat frame 42 of the seat 4, and an insert nut (not shown) is embedded in a portion of the horizontal bar 5 corresponding to the bolt hole 45. The crosspiece 5 is fixed to the seat 4 by passing the crosspiece fixing screw member 52 through the bolt hole 45, screwing it into the insert nut, and tightening it.

Furthermore, this seat 4 is fixed to a screw member 46 for fixing the seat.
It is fixed to the pillar 3 by. That is, pillar 3
The seat bracket 34 fixed at the upper end has an L-shaped cross section along the lower surface 42a and the inner surface 42b of the seat frame 42 of the seat 4, and has a portion facing the inner surface 42b of the seat frame 42. A bolt hole 35 is provided. The support column 3 and the seat 4 are connected by passing a seat fixing screw member 46 through the bolt hole 35 and screwing into the seat frame 42.

In addition, this column 3 is attached to a screw member 3 for fixing the column.
It is fixed to the base part 2 by 6. That is,
Bolt holes 37 passing vertically are bored at both ends of the lower mounting bracket 33 fixedly attached to the lower end of the column 3, and a nut 38 is fixed to the upper open end surface of the bolt hole 37 by welding. On the other hand, a bolt hole (not shown) that vertically passes through the base portion 2 is provided in a portion corresponding to the bolt hole 37 of the base portion 2.
has been established. Then, the column fixing screw member 36 is passed through both bolt holes 37 from the lower surface side of the base portion 2 and fixed to the nut 38, thereby fixing the column 3 to the base portion 2. That's what I do.

A cover 9 made of synthetic resin is provided around the outer periphery of the support column 3 to cover the fixing portion of the screw member 36 for fixing the support support. This cover 9 is the fourth
As shown in FIGS. 6 to 6, a plate 92 is arranged on one side of the column 3 and fixed to the column 3 by a screw member 91 for fixing the plate, and the plate 92 is connected to the plate 92 so as to be vertically slidable. A channel material 93 that hides the fixing screw member 91, and this channel material 9.
3 and a cap 94 that is attached to the upper end of the plate material 92 and fixes the channel material 93 to the plate material 92.
It is composed of. That is, the plate material 92 has an exposed portion 9 that is flush with the outer surface of the channel material 93.
2a, a bent portion 92b extending from both side edges of the exposed portion 92a toward the support column 3, and an extending portion 92c extending from the tip of the bent portion 92b in parallel with the exposed portion 92a. 9.
A guide rail 92d in the form of a protrusion is provided on the outer surface of 2b.
is provided in one piece. And the extending portion 92c
A bolt hole 95 is provided at the lower end of the column, and a female threaded portion 39 is provided at a portion of the lower mounting bracket 33 of the support column 3 corresponding to each bolt hole 95. This plate material 92 is fixed to the support column 3 by passing through the hole 95 and screwing into the female threaded portion 39. On the other hand, the channel material 93 has a C-shaped cross section, and has grooves 93 extending vertically on both side opening edges.
a, and by engaging the grooves 93a with the guide rail 92d, the plate material 9
2 so as to be slidable up and down. When the channel material 93 is lowered to a position where it contacts the base portion 2, the fixing portion of the screw member 36 for fixing the column and the head of the screw member 91 for fixing the plate material are hidden. In addition, the upper end of this channel material 93 and the upper end of the plate material 92 are made to coincide with each other, and a cap 94 is attached to this upper end portion. The cap 94 is lid-shaped, and the pillar 3 slides through the center thereof, and the channel material 93 and the plate material 92
A cap can be attached to the upper end of the cylinder formed by the cylinder. A locking pawl 94a is integrally provided on the inner surface of the cap 94, and engagement holes 93b and 92e are formed near the upper ends of the channel material 93 and the plate material 92. The locking claw 9 is
4a is temporarily elastically deformed inward so that the locking claws 94a are engaged with the corresponding engagement holes 93b and 92e.

According to such a configuration, the heads of the screw member 52 for fixing the crosspiece and the screw member 46 for fixing the seat are as follows.
The screw member 36 for fixing the column is exposed only on the lower surface of the base part 2, and the screw member 91 for fixing the plate material is located on the lower surface of the cover 9. It will be completely hidden. In this way, none of the screw members 36, 46, 52, 91 is exposed on any surface other than the lower surface of the seat 4 or the leg 1. Therefore, not only does it have an excellent design, but it also eliminates the problem of the screw member becoming unsightly due to rust, and there is also the problem of damaging the skin or clothing due to the burr-like part that tends to occur on the head of the screw member. can be reliably resolved.

Further, the cover 9 is constructed by sliding the channel material 93 to a predetermined position after the plate material 92 is fixed with the screw member 91 for fixing the plate material, and then,
It can be assembled by putting on the cap 94. In this way, the fixing portion of the screw member 36 for fixing the column and the head of the screw member 91 for fixing the plate material can be hidden by the cover 9, and the cover 9 can be attached to the column 36.
This means that it can be securely fixed. Therefore, with such a structure, exposure of the screw members 36, 91 for fixing the pillar and the plate material can be reliably prevented by a simple assembly operation.

Note that the chair according to the present invention is not limited to one for learning, but may be for office use, for example.

[Effects of the invention] Since the present invention has the above-described configuration, problems caused by the screw member being exposed in areas other than the bottom surface, such as spoiling the appearance of the neatness or causing problems in the head of the screw member, can be avoided. To provide a seat height-adjustable chair which can reliably solve the problem of easily damaging the skin or clothes with a burr-like part, and which can be easily assembled and carried out.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall perspective view, FIG. 2 is a perspective view showing the backrest portion, and FIG. 3 is an exploded perspective view observed from the back of the seat.
FIG. 4 is a perspective view of the support column, FIG. 5 is a vertical cross-sectional view of the upper end of the cover, and FIG. 6 is a cross-sectional view of the lower end of the cover. 1...Leg, 2...Base part, 3...Strut, 4...
...Seat, 9...Cover, 33...Lower mounting bracket, 3
4...Seat bracket, 36...Screw member for fixing the column, 42...Seat frame, 46...Screw member for fixing the seat, 91...Screw member for fixing plate material, 92...Plate material, 93... ...Channel material, 94...Cap.

Claims (1)

[Scope of Claim for Utility Model Registration] It has a plurality of extensible columns consisting of an inner column member and an outer column member, and the inner column member of this column is erected on a base via a lower mounting bracket, A seat height-adjustable chair comprising a wooden seat supported at the upper end of the outer pillar member via a seat bracket, the chair being screwed from the inside of the seat through the seat bracket and screwed onto the seat frame side. A seat fixing screw member for fixing the seat to the column; a column fixing screw member provided through the lower mounting bracket and fixing the inner column member of the column to the base; and a column fixing screw member for fixing the column to the base. a cover attached to the support column so as to cover the fixing portion of the screw member; a channel material which is vertically slidably connected to and conceals the screw member for fixing the plate material and cooperates with the plate material to surround the support column; A seat height-adjustable chair comprising a cap for fixing a channel material to a board material.