JPH026844Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a fixing device for a shaft in a chair.

[Conventional technology]

The shaft in conventional chairs has mainly been in the shape of a round bar. Therefore, the end of the shaft that passed through the seat was fixed to the leg as follows.

(1) When fixing the shaft end as a round bar, a female screw was provided on the shaft end in the radial direction from the outer peripheral surface, and a bolt was screwed into this female screw from the shaft stopper on the leg side.

(2) When fixing by cutting the shaft end of a round bar into a parallel flat body from both sides and processing the cross section into an oval shape, the inner wall of the shaft stopper is also formed into the same parallel flat body and this inner wall is It was fixed by being pressed against the shaft by tightening the bolt.

(3) When fixing two round bar shafts of the same shape with the shaft end of the horizontal shaft bent vertically into an L shape, fix a cylindrical shaft stopper with a vertical bearing hole on the leg side. The shaft end was inserted into each bearing hole and fixed.

[Problem that the invention attempts to solve]

Due to the above configuration, the conventional chair shaft fixing device has the following problems.

(1) It is extremely difficult to create a female thread in the radial direction from the outer circumferential surface of the shaft end of a round bar, and it is not necessary to temporarily place the seat between the legs and hold the seat by hand before screwing in the bolt. As the end of the round bar shaft fitted into the shaft stopper, the seat fell in the seating direction.

(2) It is extremely difficult to process a flat body that is parallel to the shaft end of a round bar, and if the seat is not temporarily placed between the legs and held by hand before being pressed together with the bolt, the two sides will be separated. Because of the contact, the seat would fall in the seating direction, or the shaft would come up due to the sliding contact caused by the helical bolt.

(3) Since both the L-shaped bending process for the shaft end and the fixing process of the cylindrical shaft stopper were difficult, it took a lot of time and effort. In addition, since the shaft is divided into left and right parts, the bearing hole on the shaft stopper side and the shaft on each side may be misaligned, making the raising and lowering rotation of the seat unsmooth.

[Means for solving problems]

This invention solves the problems of the prior art described above, and is extremely easy to process.
To provide a shaft fixing device for a chair, in which the seat is stably held even when the seat is temporarily placed between the legs and a bolt is screwed in, and the seat can be raised and lowered smoothly without shifting the shaft position. There is a particular thing. The feature of this device is that it has a concave part on the inner surface of the leg, and a shaft stopper with a stepped hole and a groove with a convex protrusion protruding from the front and back of this concave part in communication with each other, and penetrates through the seat. The shaft is formed of a rectangular member, and one end of a shaft holding plate is provided at the groove position of the shaft stopper to fix the shaft in the recess in a pressing manner by screwing a bolt through a stepped hole. It's because it's locked.

[Effect]

When fixing the shaft of the chair configured as described above, the end of the shaft attached to the seat is temporarily placed in the recess of the shaft stopper, and the shaft presser is placed on one side of the shaft and one end is locked in a groove with a convex end. When the plate is placed, the shaft comes into contact with three surfaces: two surfaces of the recess of the shaft stopper and one surface of the shaft holding plate. Therefore, even if the seat is not held by hand until the bolt from the stepped hole is screwed into the screw hole of the shaft holding plate, the seat can be stably maintained in an upright position without falling over. Immediately after this, when the above bolt is screwed in and tightened, the shaft is fixed in the recess of the shaft stopper by directly tightening the bolt on one side, and the other side uses the locking part against the convex piece in the groove as a fulcrum. In order to fix it with a pressing force of
The shaft can maintain a stable fixed state.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

1 to 5 show a first embodiment of this invention. Leg 1 in this example is
For example, it is formed into a plate shape with a wider upper side and a narrower lower side by die casting, etc., and at the lower end of the rear side, there is a right-angled mounting piece for attaching the leg 1 to the movable floor table 10 on the rear side. 2 is provided in a protruding manner with its upper piece facing inward. Each end face of this mounting piece 2 is provided with holes 3, 3 for mounting bolts. In FIG. 3, the upper part of the mounting piece 2 is provided protruding from both the inside and the outside, but this is the leg 1 of the intermediate band installed between both ends of a connected chair or the like. Therefore, the legs 1 installed at both ends of the single chair and the connected chair have the upper pieces of the above-mentioned mounting pieces 2 protruding only on the inside.

Further, on the inner surface of the leg 1 at a mid-height position near the front part, a shaft stopper 4 for fitting and fixing the end of a shaft 6, which will be described later, is protrudingly provided in an inclined manner with the front end side raised. There is. This shaft stopper 4 is formed as follows. In other words, as shown in Figure 5,
This shaft stopper 4 has a recess 4a that fits and fixes the end of the shaft 6 in the rectangular intermediate zone, and when the end of the shaft 6 is fitted in this position, the lower side corner of the recess 4a The two adjacent surfaces are arranged at an angle of approximately 45 degrees so that they are in equal contact with the two surfaces of the shaft 6. A stepped hole 4b is provided through the front side of the recess 4a and communicates with one end of the upper side of the recess 4a. Further, on the rear end side of the recess 4a, a parallel groove 4d is provided in which a shaft holding plate 8 having a planar rectangular shape, which will be described later, can be accommodated therein. A convex piece 4c for forming the groove 4d is provided in parallel at the upper part of the lower end of the groove 4d with a length extending up to the recess 4a.

Next, as shown in FIG. 1, the seat 5 is made hollow using a blow molded product and has holes 5a on both rear sides. The shaft 6, which is arranged between the legs 1 on both sides so as to be able to rise and fall freely, has an outer peripheral portion including both ends formed of a rectangular member such as a square pipe. In this case, both ends of the shaft 6 passing through the seat 5 are integrated into the seat 5 via an arm 7 having a member such as a bushing fitted to each shaft end on each side, so that the shaft 6 extends to a predetermined length. It is protruding in the direction.

Further, at the position of the rear side groove 4d of the shaft stopper 4, a bolt 9 which is passed through from the stepped hole 4b on the front side to the rear side through the recess 4a is screwed into the shaft 66 in the recess 4a. A shaft holding plate 8 is fitted and arranged to press and fix the shaft from above from the rear. This shaft holding plate 8 is formed into a rectangular flat body as a whole. A screw hole 8a into which the bolt 9 is screwed is provided at one end of the surface of the shaft holding plate 8, and the shaft is fixed in a chair such as a connected chair installed on a movable floor stand 10 having a pedestal shape as a whole. configured on the device.

In the chair according to the first embodiment described above, when fixing the shaft 6 with the seat 5 between the legs 1, first the legs 1 are
It is fixed to the rear movable bed 10 with a predetermined gap corresponding to the seat 5 by screwing bolts (not shown) through each hole 3 provided in the mounting piece 2 for each position. In this embodiment, a seat 5 with a shaft 6 inserted therebetween is inserted between the legs 1 on both sides, and both ends of the shaft 6 are temporarily stored in the recesses 4a provided in the shaft stopper 4 on each side. When fitted, the recess 4a is inclined at an angle of approximately 45 degrees with the front end side higher, similar to the shaft stopper 4, so that the shaft 6 is The shaft 6 can be fitted and placed in a state in which the shaft 6 is in equal contact with the two surfaces of the recess 4a, and the center of gravity of the shaft 6 is located on a perpendicular line to the corner between the two surfaces on the recess 4a side. Moreover, the shaft holding plate 8 is placed on one surface of the shaft 6 in such a manner that one end thereof is locked in the groove 4d with the convex piece 4c. It comes into contact with three surfaces: the surface and one surface of the shaft holding plate 8. Therefore, even if the seat 5 is not held by hand until the bolt 9 inserted from the stepped hole 4b side is screwed into the screw hole 8a of the shaft holding plate 8, the seat 5 can be stably prevented from falling. Since the upright position is maintained, workability when assembling the seat 5 to the leg 1 can be improved.

Immediately after this, when the tip of the bolt 9 inserted from the stepped hole 4b side is screwed into the screw hole 8a of the shaft holding plate 8 and tightened, the shaft 6 fitted in the recess 4a of the shaft stopper 4 is A shaft holding plate 8 is placed in this recess 4a.
In order to fix the shaft 6 easily and reliably by directly tightening the bolt 9 on one side of the bolt 9 and applying a pressing force using the locking portion of the protrusion 4c at the groove 4d position as a fulcrum on the other side, the shaft 6 is attached to the shaft stopper 4. A stable fixing state can be maintained within the recess 4a.

FIG. 6 shows a second embodiment of this invention. In this second embodiment, the shaft stopper 4 and the shaft holding plate 8 are
The structure of the second embodiment is the same as that of the first embodiment except that the second embodiment is different from the first embodiment. Therefore, explanation of the structure other than the above-mentioned shaft stopper 4 and shaft presser plate 8 will be omitted. Further, in this second embodiment, the surroundings of the shaft stopper 4 and the shaft presser plate 8 will be described using the reference numerals of the first embodiment. Furthermore, the explanation of the operation for fixing the shaft 6 in this second embodiment will be made using some of the drawings of the above-described first embodiment.

As shown in FIG. 6, the shaft stopper 4 of the second embodiment is provided on the front end side in order to fit and fix the end of the shaft 6 to the inner surface at a mid-height position near the front part of the leg 1. It is installed in a protruding manner with a slope that raises the height. This shaft stopper 4 is formed as follows. That is, this shaft stopper 4 has a recess 4a that fits and fixes the end of the shaft 6 in the rectangular intermediate zone, and when the end of the shaft 6 is fitted in this position, one side wall and the bottom of the recess 4a meet. The two surfaces of the shaft 6 are arranged at an angle of approximately 45 degrees so that the two surfaces thereof are in contact with the two surfaces of the shaft 6. A stepped hole 4b is provided through the front side of the recess 4a and communicates with one end of the lower side of the recess 4a. Further, a groove 4d is provided above the rear end side of the recess 4a to receive and lock the tip of an L-shaped shaft holding plate 8, which will be described later. A convex piece 4c for forming the groove 4d is protruded in parallel from the upper part of the groove 4d with a length that extends up to the recess 4a.

In addition, at the rear side position of the shaft stopper 4, a bolt 9 passing from the stepped hole 4b on the front side to the rear side through the recess 4a is screwed, so that the shaft 6 in the recess 4a is moved upward in the rear part. A shaft holding plate 8 is disposed for pressing and fixing. This shaft holding plate 8 is
The proximal side piece 8b is formed into an L-shape so that when the distal end thereof is locked in the groove 4d with the convex piece 4c, the proximal side piece 8b comes into close contact with the other external side surface of the shaft stopper 4. A screw hole 8a into which a bolt 9 is screwed is provided on the upper surface of the shaft holding plate 8 near the side piece 8b.

In the chair according to the second embodiment, when the shaft 6 with the seat 5 is fixed between the legs 1, the legs 1 are attached to the rear movable floor table 10 using the attachment pieces 2, as in the first embodiment. It is fixed by screwing bolts (not shown) through each hole 3. And legs 1 on both sides according to this aspect
A seat 5 into which the shaft 6 is inserted is inserted between the recesses 4a provided in the shaft stopper 4 on each side of the shaft 6.
After fitting into the shaft 6, a shaft holding plate 8 is placed on one surface of the shaft 6 in such a manner that its tip is locked in the groove 4d with the convex piece 4c. The two sides of the recess 4a and one side of the shaft holding plate 8 come into contact with each other on three sides. Therefore, the bolt 9 inserted from the stepped hole 4b side is inserted into the screw hole 8a of the shaft holding plate 8.
Even if the seat 5 is not held by hand until it is screwed into the shaft, the shaft holding plate 8 placed on one side of the shaft 6 locks its tip into the groove 4d with the convex piece 4c, and the side Since the piece 8b is in close contact with the external side surface of the shaft stopper 4, the seat 5
The seat 5 is stably maintained in an upright position without falling down, and workability when assembling the seat 5 to the leg 1 can be improved.

Immediately after this, when the tip of the bolt 9 inserted from the stepped hole 4b side is screwed into the screw hole 8a of the shaft holding plate 8 and tightened, the shaft 6 fitted in the recess 4a of the shaft stopper 4 is A shaft holding plate 8 is placed in this recess 4a.
It is easy to directly tighten the bolt 9 on the proximal side of the bolt 9, with a pressing force using the locking portion of the protruding piece 4c at the groove 4d position on the distal end side as a fulcrum, and with a force of adhesion to the shaft stopper 4 on the side piece 8b. In order to securely fix the shaft 6, as in the first embodiment described above,
A stable fixation can be maintained within the recess 4a of the shaft stopper 4. In addition, in this second embodiment, since the convex piece 4c is arranged above the tip of the shaft holding plate 8,
It is possible to prevent dirt, dust, etc. from entering the groove 4d and the recess 4a.

Furthermore, in both the first and second embodiments described above, since the leg 1 is entirely formed by die casting or the like, secondary processing is not required for each part including the shaft stopper 4. It is possible to increase production efficiency.

[Effect of idea]

This idea consists of a concave part on the inner surface of the leg, a shaft stopper with a stepped hole and a groove with a convex protrusion in communication with each other on the front and back of this concave part, and the shaft passing through the seat is made of a rectangular piece. In addition, in the groove position of the shaft stopper, one end of the shaft holding plate that presses and fixes the shaft in the recess is secured by screwing a bolt through the stepped hole. This is a characteristic feature.
Therefore, when fixing the shaft of a chair, the shaft attached to the seat is accommodated in the recess of the shaft stopper, and a shaft holding plate with one end locked in a groove with a convex end is placed on one side of the shaft. By doing so, this shaft is contacted on three sides by the two sides of the recess of the shaft stopper and one side of the shaft holding plate, so there is no need to hold the seat by hand before screwing in the bolt from the stepped hole. Not only can the seat maintain a stable upright position, but also the shaft can be maintained in a stable fixed position within the recess of the shaft stopper by screwing the bolt into the shaft holding plate and tightening it. It has the effect of significantly increasing productivity and quality.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a shaft fixing device for a chair according to the first embodiment of this invention, Fig. 2 is a side view of a leg which is the main part of the device, and Fig. 3 is an arrow A in Fig. 2. A visual dorsal view of the same leg, Figure 4 is B in Figure 2.
FIG. 5 is a sectional view taken along line C--C in FIG. 4, and FIG. 6 is a plan view showing how the shaft is fixed in the second embodiment of this invention, as shown in FIG. It is a sectional view taken at a position corresponding to line -C. 1... Leg, 4... Shaft stopper, 4a... Recess, 4
b...Stepped hole, 4c...Convex piece, 4d...Groove, 5...
...Seat, 6...Shaft, 8...Shaft holding plate, 8a...Screw hole, 8b...Side piece, 9...Bolt.

Claims (1)

[Scope of utility model registration request] A recess is provided on the inner surface of the leg, and a shaft stopper is protruding from the front and rear of the recess, in which a stepped hole and a groove with a convex end are provided in communication with each other, and the shaft passing through the seat is formed of a rectangular material. , a chair characterized in that one end of a shaft holding plate that presses and fixes the shaft in the recessed portion is locked in the groove position of the shaft stopper by screwing a bolt through a stepped hole. A fixing device for the shaft.