JPS63257511A - Sitting height adjustable chair - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a chair with adjustable seat height, which is suitably used for school children and the like.

[Prior Art] As a type of chair whose sitting height can be adjusted, there is provided a chair body having legs that touch the floor and legs that do not touch the floor, and the end portions of the legs of the chair body that are arranged as described above. A type of device has been considered that includes a connecting and fixing means that is fixed to the upright surface of the leg portion so that the height position can be changed.

By the way, the conventional connection and fixing means includes drilling a plurality of bolt holes vertically at predetermined intervals in each of the four pillars constituting the leg, and also attaching bolt holes to the tips of the four legs of the chair body. A single bolt hole is provided in each part, and the bolt inserted through the bolt hole of the leg is passed through one of the bolt holes drilled in the pillar, and a nut is screwed into the through end. This is what I did.

[Problems to be solved by the invention] However, in order to change the height of the seat with such a configuration, the nuts screwed onto the bolts that fix each leg must be removed, and then It is necessary to remove the bolts from the bolt holes in the pedestal, then reinsert the bolts into different bolt holes and tighten the nuts. Therefore, there is a problem in that it takes a lot of effort to adjust the sitting height.

The present invention aims to solve such problems.

[Means for Solving the Problems] In order to achieve the above objects, the present invention employs the following configuration.

That is, the adjustable seat height chair according to the present invention includes a chair body having legs that touch the floor and legs that do not touch the floor;
A connecting and fixing means for fixing the end portions of the legs of the chair body to the upright surface of the leg part in a height-changeable manner, the connecting and fixing means being formed on the upright surface. A recessed part, a fixing fitting having a slit that is attached to an open end of the recessed part and extending vertically, a bolt passed through the slit of the fixing fitting and the force, and a bolt inserted into the recessed part. a nut member that is screwed onto the insertion end side or the outer end side and cooperates with the head of the bolt to sandwich the fixing metal fitting and the force when tightening; and a nut member arranged in multiple stages along the slit of the fixing metal fitting. The bolt or nut member is provided to lock the bolt or nut member when tightened, and to allow the bolt to move along the slit when not tightened.

[Function] With this kind of configuration, by rotating the head of each bolt or each nut member exposed to the outside,
When the tightened state is released, each bolt can be moved along the slit of the fixing metal fitting. In this state, when the chair body is raised and lowered until the seat surface reaches the desired height, and then a tightening operation is applied to each of the bolts or nut members, the fixing metal fittings and the force are
・It is sandwiched between the head and the nut member. In this tightened state, the bolt or nut member is locked to the locking portion located at a different height from the previous one. Therefore, the force is fixed at the changed position without causing any risk of slipping down.

Therefore, with such a device, the sitting height can be adjusted without removing each bolt from its mounting position.

[Example code] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Embodiment 1 (FIGS. 1 to 5) As shown in FIGS. 1 and 2, this chair has a chair body having leg portions 2 that are in contact with the floor 1 and legs 31 that are not in contact with the floor 1. 3, and a connecting and fixing means 4 for fixing the tip end portion of the leg 31 of the chair body 3 to the upright surface 2a of the leg portion 2 such that the height position can be changed.

The leg part 2 has a wooden frame shape formed by connecting four pillars 21 with horizontal members 22, 23, and 24, and the front part thereof has a
A footboard (not shown) is attached so that its height can be adjusted.

The chair body 3 includes a seat 33 on a seat frame 32, and
A backrest 34 is connected to the rear edge of the seat frame 32,
It has four legs 31 that do not touch the floor 1. and,
The outer surfaces 31a of these legs 31 are attached to the inner upright surfaces 2a of each of the pillars 21.

The connection fixing means 4 includes a concave portion 4 formed in the upright surface 2a.
1, a fixing metal fitting 43 having a slit 42 that is attached to the open end of this concave portion 41 and extending vertically, a bolt 44 that is passed through the slit 42 of this fixing metal fitting 43 and the force 31, and this bolt. 44, a nut member 45 screwed onto the insertion end side of the concave portion 41, and the fixing metal fitting 43.
A locking portion 46 provided in multiple stages along the slit 42 of
It is equipped with.

The recessed portion 41 is elongated and extends in the vertical direction, and has a narrow groove 41a formed in the center of the bottom surface thereof in the vertical direction. Then, a thin bottom plate 41b is attached to the bottom surface of this concave portion 41, and a portion of this bottom plate 41b corresponding to the groove 41a is
A plurality of bolt holding holes 41C are formed at predetermined intervals in the vertical direction.

The fixing fitting 43 has the same elongated shape as the opening shape of the recessed part 41, and has a bent part 43a on its inner peripheral edge.
have. The fixing fitting 43 is attached to the open end of the recessed part 41 so that the tip of the bent part 43a comes into contact with the bottom surface of the recessed part 41, and the bolt 4
7 and a connector nut 48 to be fixed to the pillar 21.

In this fixed state, the outer surface of the fixture 43 and the upright surface 2a of the pillar 21 are flush with each other. The slit 42 is formed in a portion of the fixing metal fitting 43 corresponding to the groove 42a, and the recessed portion is opened to the outside through this slit.

The bolt 44 has a head 44a at its outer end, and is inserted into the bolt hole 3 formed at the tip of the leg 31 of the chair body 3.
1b and the slit 42 of the fixing metal fitting 43, and is inserted into the recessed part 41. It has a threaded portion 44b on its insertion end side.

The nut member 45 is disposed within the recessed portion 41 and is screwed onto the threaded portion 44b of the bolt 44. This nut member 45 is rectangular, and its two sides are placed close to the bent portion 43a of the fixing metal fitting 43 to prevent it from spinning idly.

The locking portions 46 are formed by cutting and raising both side portions of the slit 42 of the fixing metal fitting 43 in the direction of the recessed portion, and are capable of locking the lower edge of the nut member 45. A plurality of them are provided at regular intervals. Note that a gap is formed between the tip of the locking portion 46 and the bottom plate 41b, through which the nut portion 45 can pass.

With such a configuration, when the bolt 44 and the nut member 45 are tightened, the head 4 of the bolt 44
4a and the nut member 45, the leg 31 of the chair body 3 and the fixing metal fitting 43 are held, and the nut member 45 is locked to a specific locking portion 46. Therefore, the legs 31 of the chair body 3 are
The chair body 3 and the leg portion 2 are firmly fixed to the leg post 21 of the chair body 3 and are integrated. In addition, in such a tightened state, the tip of the bolt 44 is inserted into the bolt holding hole 4 of the bottom plate 41b.
1c and held there.

From this state, when the head 44a of the bolt 44 exposed to the outside is rotated by a driver (not shown) to release the tightened state, the nut member 45 moves toward the bottom of the concave portion 41, and the locking portion 46 engages the nut member 45. Released from the locked state. Therefore, this bolt 44 can be moved along the slit 42 of the fixture 43. Therefore, by loosening the bolts 44 of all the legs 31, the chair body 3 can be raised and lowered with respect to the legs 2, and the position of the seat surface 33a can be changed.

Then, by tightening each bolt 44 again at a desired position, the nut member 45 will be locked to the locking part 46 that is present at a different height position. Therefore, the leg 31 is fixed to the leg portion 2 in the changed position.

Therefore, with such a device, the sitting height can be adjusted without removing each bolt 44 from its mounting position, making the adjustment work much easier than in the conventional device. Moreover, in the tightened state, the nut member 45 is locked to the locking part 46, so even if a load is applied to the seat 33, problems such as the leg 31 slipping down from the leg 2 will not occur. .

Embodiment 2 (FIGS. 6 and 7) The connection and fixing means 104 of this embodiment is connected to the pillar 31 of the leg portion 2.
a concave portion 141 formed on the inner upright surface 2a;
A fixing metal fitting 143 is attached to the open end of the concave portion 141 in the same manner as in Example 1 and has a vertically extending slit 142, and the slit 142 of this fixing metal fitting 143 and the leg 31 of the chair body 3 are penetrated. a nut member 145 screwed onto the insertion end of the bolt 144 into the concave portion 141; and a locking portion 146 provided in multiple stages along the slit 142 of the fixing metal fitting 143. It is equipped with

The nut member 145 is plate-shaped with a boss portion 145a, and has a bent portion 145b bent outward at its lower edge.

On the other hand, the locking portion 146 has a notch shape formed by cutting out both sides of the slit 142 in the fixing metal fitting 143, and the locking portion 146 has a notch shape.
45 bent portions 145b can be engaged with each other.

Note that the bolt 144 has a stopper 14 for preventing removal.
4C is installed.

With this configuration, when the bolt 144 and the nut member 145 are tightened, the force 31 and the fixing metal fitting 143 are held between the head 144a of the bolt 144 and the nut member 145. Along with
The bent portion 145b of the nut member 145 is inserted into a specific locking portion 146 and locked. On the other hand, when the bolt 144 is loosened, the nut member 145 retreats toward the bottom of the concave portion 141, and its bent portion 145b is disengaged from the locking portion 146. Therefore, the bolt 144 can be moved along the slit 142, and the seat height can be adjusted as in the first embodiment.

Embodiment 3 (FIGS. 8 and 9) The connecting and fixing member 204 of this embodiment includes a concave portion 241 formed in the upright surface 2a, and a slit 242 that is covered at the open end of the concave portion 241 and extends vertically. a bolt 244 passed through the slit 242 of the fixture 243 and the force 31; and a nut member 245 screwed onto the end of the bolt 244 inserted into the concave portion 241. and the slit 2 of the fixing fitting 243
42, and locking portions 246 provided in multiple stages.

The nut member 245 has a rectangular shape and is dimensioned to prevent it from idling within the concave portion 241.

The locking portion 246 is a recess formed diagonally downward from one side edge of the slit 242.
6 so that the bolt 244 can be engaged with the bolt 244.

In addition, each connection fixing means 20 provided on the four pillars 21
The four locking portions 246 are all formed on the same side edge of the slit 242.

In such a configuration, the leg 31 is fixed to the leg portion 2 by engaging the bolt 244 with a specific locking portion 246 and then tightening the bolt 244 and the nut member 245. . From this state, each bolt 24
4, it becomes possible to remove the bolt 244 from the locking part 246 and move it up and down along the slit 242.

Therefore, by grasping the chair body 3 and removing the four bolts 244 from the corresponding locking parts 246 at the same time, move the chair body 3 up and down along the slit 242, and then reinstall the locking parts 246 at the desired height. By engaging, the height of the seat surface can be changed.

Thereafter, by tightening each of the bolts 244, the bolts 244 cannot be removed from the locking portion 246, and the chair body 3 and the leg portion 2 are integrated.

Embodiment 4 (FIGS. 10 to 12) The connection and fixing means 304 of this embodiment connects the upright surface 2 of the leg 2.
This fixation is performed by positioning a concave portion 341 formed in the concave portion a, a fixing metal fitting 343 having a slit 342 that is capped on the open end of the concave portion 341 and having a vertically extending slit 342, and a head portion 344a within the concave portion 341. A bolt 344 passed through the slit 342 of the metal fitting 343 and the leg 31 of the chair body 3, and a nut member 345 screwed onto the outer end of the bolt 344.
and locking portions 346 provided in multiple stages along the slit 342 of the fixing metal fitting 343.

The bolt 344 has a threaded portion 34 formed on its outer end.
4b has a non-circular cross-sectional shape as shown in FIG. There is.

The nut member 345 is in the form of a so-called wing nut, and can be rotated without using a tool.

The engaging portion 346 has the same configuration as that of the third embodiment,
They are provided in multiple stages at predetermined intervals in the vertical direction.

In such a configuration, the leg 31 is fixed to the leg portion 2 by engaging the bolt 344 with a specific locking portion 346 and then tightening the bolt 344 and the nut member 345. . From this state, when the nut member 345 located outside is loosened, the bolt 344 can be removed from the locking part 346 and moved up and down along the slit 342. Therefore, by grasping the chair body 3, the four bolts 344 can be simultaneously tightened on the corresponding locking portions 34.
6, move it up and down along the slit 342, and re-engage with the locking portion 346 at the desired height, thereby changing the height of the seat surface. Thereafter, by tightening each of the nut members 345, the bolts 344 cannot be removed from the locking portions 346, and the chair body 3 and the leg portions 2 are integrated.

Note that the shapes of the chair body and the legs are not limited to those of the illustrated embodiment.

Further, the configuration of the connection and holding means is not limited to that described above, and for example, the head of a bolt located in the recessed portion may be locked to the locking portion, etc., without departing from the spirit of the present invention. Various modifications are possible within the range.

[Effects of the Invention] Since the present invention has the above-described configuration, the seat height can be easily adjusted without removing the bolt from the mounting position, and after the adjustment, the chair body can be It is possible to provide a seat height-adjustable chair that can be securely fixed without causing any misalignment.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a front view, and FIG. 3 is a second embodiment in which the legs are omitted.
■arrow view in the figure, Figure 4 is IV-r in Figure 3
5 is a sectional view taken along the line v--v in FIG. 4. 6 is a diagram corresponding to FIG. 3 showing a second embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line ■--■ in FIG. 6. 8 is a diagram corresponding to FIG. 3 showing the third embodiment, and FIG. 9 is a sectional view taken along the line IX--IX in FIG. 8. FIG. 10 is a diagram corresponding to FIG. 3 showing the fourth embodiment, and FIG. 11 is a diagram corresponding to FIG.
12 is an enlarged sectional view showing the cross-sectional shape of the bolt in the same embodiment.

Claims (1)

[Claims] A chair body having legs that touch the floor and legs that do not touch the floor, and a connecting fixing means that fixes the end portions of the legs of the chair body to the standing surface of the legs so that the height position can be changed. the chair, wherein the connecting and fixing means includes a recess formed in the upright surface; a fixing fitting having a lid attached to an open end of the recess and a slit extending vertically; and the fixing fitting. a bolt passed through the slit and the leg, and the bolt is screwed onto the insertion end or the outer end of the bolt into the recessed part and cooperates with the head of the bolt when tightening the fixing metal fitting and the leg. and a locking part provided in multiple stages along the slit of the fixture to lock the bolt or nut member when tightened and allow the bolt to move along the slit when not tightened. A chair with adjustable seat height.