JP2001059515A - Shaft locking device for slide shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft locking device for a slide shaft capable of preventing falling-off thereof without requiring work thereon. SOLUTION: A shaft-end of a slide shaft 15 is fitted via a sliding bush 16 by insertion into a slotted hole formed in a support member for supporting the shaft-end of the slide shaft 15 slidable in a longitudinal direction of the slotted hole. An end of the bush 16 projecting from the slotted hole is formed with an engaging part 20 while a face cover 21 for covering the end part of the bush 16 is provided with a locking part 23 to be engagingly attached to the engaging part 20 of the bush 16. The slide shaft 15 is prevented from falling off and the shaft-end thereof is covered by the face cover 21 to be attached to the engaging part 20 of the bush 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide shaft fixing device, and more particularly to a slide shaft fixation device for concealing a slide shaft end and preventing the slide shaft from being removed without requiring special processing on the shaft end. Related to the device.

[0002]

2. Description of the Related Art In a reclining type chair, for example, as schematically shown in FIG. 5, a frame 4 of a backrest 3 is mounted on a receiving base 2 supported by a leg 1 so as to be tiltable rearward about a shaft 5. In conjunction with the backward tilt of the backrest 3, the seat 6 slides slightly backward to facilitate sitting according to the inclination angle of the backrest 3.

Since the seat 6 slides while its rear portion swings up and down, the shaft end of a slide shaft 8 laid laterally near the front end of the seat 7 of the seat 6 is positioned on both sides of the support 2. It is inserted into a long hole 9 formed in the portion, and is slidable by the length of the long hole 9.

To mount the slide shaft 8, as shown in FIG. 6, one end side as viewed in the direction of arrow AA in FIG. A groove 10 is machined in the circumferential direction of the shaft end protruding from 9, a stopper 11 such as an E-ring is fitted into this groove 10 to prevent the stopper from coming off, and a decorative cover 12 is put on the stopper to cover the stopper 11. The decorative cover 12 is fixed to the receiving base 2 so as to be hidden. Reference numeral 13 denotes a bush fitted in the elongated hole 9 to improve the sliding of the slide shaft 8.

[0005]

However, in the above-mentioned conventional structure, a groove 10 is formed in the shaft end of the slide shaft 8, a stopper 11 such as an E-ring is fitted in the groove 10, and then a decorative cover 12 is put thereon. However, since it is necessary to fix the decorative cover 12 to the receiving table 2, it is necessary to form a groove in the shaft end, and the clasp 11 is required, and the decorative cover 12 must be fixed by means such as bonding. As a result, there is a problem that processing costs, parts costs, and assembly costs are remarkably increased, and the cost increases.

[0006] This is not limited to the slide shaft of the chair, and the same can be said for the slide shaft in other applications.

According to the present invention, no processing is required for the slide shaft, and the bush and the decorative cover for the slide are used to prevent the slide shaft from being removed.
The purpose was to significantly reduce the number of assembly steps and reduce costs.

[0008]

According to the present invention, as a means for solving the above-mentioned problems, the shaft end of the slide shaft is inserted into a long hole formed in a support member for supporting the shaft end of the slide shaft through a slide bush. The bush is slidably fitted in the longitudinal direction of the long hole, and an engaging portion is formed at an end of the bush protruding from the long hole, and the engaging portion of the bush is engaged with a decorative cover covering the end of the bush. The bush and the slide shaft are prevented from being pulled out and the shaft ends of the bush and the slide shaft are concealed by a decorative cover engaged with the engagement portion of the bush.

[0009] The above device is suitable for a reclining type chair applied to a slide shaft for sliding a seat portion with respect to a cradle.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows the present invention in which the seat 6 in the reclining type chair shown in FIG. 5 is slid in front of a seat 7 of the seat 6 in order to allow the pedestal 2 to slide back and forth. This shows an embodiment in which the present invention is applied to a slide shaft 15 to be provided, and an oblong bush 16 made of a resin material having good slip is fitted in a long hole 9 formed in the receiving base 2. ing.

The bush 16 is shown in FIGS.
As shown in the figure, the shaft has an oval-shaped shaft insertion portion 17 that fits inside the elongated hole 9, and the base has a flange portion 18 interposed between the seat receiver 7 and the pedestal 2. And the shaft insertion portion 17
An oval shaft insertion hole 19 having a short diameter through which the diameter of the slide shaft 15 can be inserted as close as possible to the flange portion 18 is formed.

The outer surface of the shaft insertion portion 17 protruding from the long hole 9 has an engaging portion 20, 2, 2
0 is formed, and the shaft end 15a of the slide shaft 15 is formed.
Has a length that does not protrude from the shaft insertion portion 17.

The decorative cover 21 is formed of an elastic resin material as shown in FIGS. 3A to 3C, and has a peripheral portion 22 which is fitted to the outer end of the shaft insertion portion 17 of the bush 16.
A claw-shaped locking portion 23, which engages with the engaging portion 20, 20, is protruded from the inner surface of the long side of the peripheral portion 22. When the decorative cover 21 is fitted to the outer end of the shaft insertion portion 17 of the bush 16, the engaging portions 23 of the decorative cover 21 are engaged with the engaging portions 20, 20 of the bush 16 as shown in FIG. So that the slide shaft 15 is prevented from slipping out and concealed at the same time, while the slide shaft 15 is slidable in the direction of arrow A in FIG.

Therefore, at the time of assembling, the bush 16 is pressed into the elongated hole 9 of the receiving base 2 from the inside, the shaft end 15a of the slide shaft 15 inserted into the seat 7 is inserted into the bush 16, and then the decorative cover 21 is attached to the bush 16. If the engaging portions 23 are engaged with the engaging portions 20 of the bush 16, the decorative cover 21 is attached without being detached. Is moving in the axial direction, the shaft end 15a of the
As it hits the inner surface of No. 1, it will not be pulled out.

[0016]

As described above, according to the present invention, without using a stopper such as an E-ring at the shaft end of the slide shaft,
The bush used to slide the slide shaft is used to prevent the slide shaft from moving in the axial direction with the decorative cover that engages with the bush. This eliminates the need for groove machining of the slide shaft, thereby reducing machining costs and eliminating the need for fasteners such as E-rings, reducing the number of parts, and fitting the decorative cover to the bush during assembly. It is easy to assemble because it only needs to be done, especially when it is applied to the slide shaft of a reclining type chair, there is no need to protrude the shaft end of the slide shaft to fit the E ring, so a chair with a clean appearance can do.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of the present invention.

FIGS. 2A and 2B show a bush in FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a side view, FIG. 2C is a cross-sectional view taken along line BB of FIG. -C sectional drawing.

FIG. 3 shows the decorative cover in FIG. 1 (A).
Is a front view, (B) is a DD sectional view of (A), and (C) is an EE sectional view of (A).

FIG. 4 is a horizontal sectional view of FIG. 1;

FIG. 5 is a schematic side view of a reclining type chair shown as an application example of the present invention.

FIG. 6 is a partial cross-sectional view showing a conventional slide shaft stopper device.

[Explanation of symbols]

 2 Receiving stand 3 Backrest 6 Seat 7 Seat support 8, 15 Slide shaft 9 Long hole 10 Groove 11 Stopper (E-ring) 12, 21 Makeup cover 13, 16 Bush 17 Shaft insertion part 18 Flange part 19 Shaft insertion hole 20 Engagement Joint 23 Locking part

Claims (2)

[Claims] An axial end of a slide shaft is slidably inserted in a longitudinal direction of the elongated hole through a slide bush into an elongated hole formed in a support member for supporting the axial end of the slide shaft. An engaging portion is formed at an end protruding from the long hole, and a decorative portion covering the end of the bush is provided with a locking portion engaging with the engaging portion of the bush. A slide shaft axle fixing device, wherein a slide cover is prevented from being pulled out and a bush and a shaft end of the slide shaft are concealed by an engaging decorative cover. 2. The slide shaft according to claim 1, wherein said slide shaft is a shaft for sliding a seat portion of a reclining type chair with respect to a cradle, and said support member is a cradle of said chair. apparatus.