JP3550040B2 - Mounting method of back arm of chair and its structure - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method of attaching a back arm to a chair seat and its structure.
[0002]
[Prior art]
Conventionally, the following method is known as a method of attaching a back arm for attaching a backrest to a chair seat.
[0003]
As shown in FIGS. 6 and 7, a substantially L-shaped back arm having a horizontal portion formed at the lower end of a vertical portion is provided with a fastening hole passing through the vertical portion of the horizontal portion on the back surface of the chair. After fitting into the locking adjustment screw hanging down from the mounting frame provided, a through hole horizontally penetrated at the end of the horizontal portion, and a hole for the rotating shaft penetrated in the horizontal direction of the mounting frame, After the rotation pin is inserted into both holes, the rotation pin is fixed via a fixing member such as a nut or a pine needle pin so that the rotation pin does not come out of both holes. The back arm is attached by screwing a locking adjustment member containing a spring inside the locking adjustment screw.
[0004]
In addition, the horizontal portion of the substantially L-shaped back arm is fixed to a mounting frame on the back of the seat via a fixing tool such as a bolt or a screw to attach the back arm.
[0005]
In the former, the back arm can be tilted rearward, and in the latter, the back arm cannot be tilted rearward.
[0006]
Further, the back arm is disassembled and detached from the mounting frame of the chair, and is packed together with the seat, the backrest, and the leg of the chair, and is transported by being loaded on a transportation means such as a container or a truck.
[0007]
6 and 7, 10 is a vertical part, 12 is a horizontal part, 14 is a back arm, 28 is a chair seat, 30 is a locking adjustment screw, 32 is a spring, 34 is a locking adjustment member, and 36 is a mounting member. A frame, 46 is a rotation shaft hole, 48 is a through hole, 50 is a rotation pin, 52 is a fastening hole, and 54 is a fixing member.
[0008]
[Problems to be solved by the invention]
In the former method of mounting and structure of the conventional back arm, the back can be tilted rearward, but the fitting of the fastening hole of the horizontal portion of the back arm into the locking adjustment screw, the horizontal movement of the horizontal portion of the back arm, Alignment of the through hole at the end of the horizontal part with the hole for the rotation axis of the mounting frame on the back of the seat, insertion of the rotation pin into both holes, fixing with the fixing member to the rotation pin after insertion, locking adjustment Each operation of mounting the locking adjustment member to the screw is required, and the number of mounting steps is large, and the mounting operation is difficult.
[0009]
In addition, since the back arm is packaged in a disassembled state removed from the seat and delivered to the purchaser, the purchaser of the chair must attach the back arm himself, and it is difficult to perform the installation work, so it can not be installed. It has been a problem that it occurs frequently and places a large burden on the purchaser.
[0010]
The present invention has been made in view of the above-described drawbacks, and has as its object to provide a method of mounting a back arm of a chair and a structure thereof, which can easily mount the back arm of the chair.
[0011]
[Means for Solving the Problems]
The present invention relates to a method and structure for attaching a substantially L-shaped back arm having a horizontal portion formed at a lower end of a vertical portion, wherein a rotation of a back surface of a chair for pivotally locking the tip of the horizontal portion of the back arm is provided. A first horizontal portion having a dynamic shaft formed by opening the upper portion and opening locking grooves on both side surfaces of the tip to the outside, and having a short hole formed in a horizontal surface, and a lower portion being opened to form a position corresponding to the short hole And a horizontal part body having a long hole longer than the short hole formed in the horizontal plane, and the locking groove of the horizontal part of the back arm, which is constituted by: After the horizontal portion of the back arm is positioned horizontally while inserting the short hole and the long hole of the horizontal portion of the back arm into the locking adjustment screw, the locking adjustment screw is provided with a locking adjustment member having a spring mounted therein. Attach the back arm by screwing it And it is characterized in and.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The chair used in the present invention is a swivel chair and may or may not have a lifting mechanism.
[0013]
The back arm mounting structure for a chair according to the present invention has the following configuration, as shown in FIGS.
[0014]
The horizontal portion 12 of the substantially L-shaped back arm 14 having the horizontal portion 12 formed at the lower end of the vertical portion 10 is opened upward to form locking grooves 16 on both side surfaces of the tip, and to be short in a horizontal plane. It comprises a first horizontal portion 20 having a hole 18 formed therein, and a horizontal portion main body 24 having a lower surface opened and a long hole 22 formed in a horizontal plane.
[0015]
In this example, the shape of the locking groove 16 is changed from the upper end to the lower inner side so that the locking groove 16 can be rotatably locked to the rotating shaft 38 of the back arm 14 disposed on the mounting frame 36 on the back surface of the seat 28 described later. The shape of the locking groove 16 smoothly guides the back arm 14 when the back arm 14 is mounted, and the back arm 14 is moved relative to the rotation shaft 38 after the back arm 14 is mounted. It becomes rotatable.
[0016]
Further, the first horizontal portion 20 and the horizontal portion main body 24 constituting the horizontal portion 12 are each formed of a steel material having a U-shaped cross section, and the first horizontal portion 20 is fitted to the horizontal portion main body 24 so as to fit outside. The first horizontal portion 20 is open at the top, and the horizontal portion main body 24 is open at the bottom.
[0017]
As described above, by forming the horizontal portion 12 by the first horizontal portion 20 and the horizontal portion main body 24, the processing of the locking groove 16, the short hole 18, and the long hole 22 is facilitated, and the productivity is improved. it can.
[0018]
The horizontal portion main body 24 is positioned from above the first horizontal portion 20 so that the outer edge of the short hole 18 (the right edge in FIG. 3) of the first horizontal portion 20 corresponds to the outer edge of the long hole 22 of the horizontal portion main body 24. Is fixed.
[0019]
The short hole 18 and the long hole 22 form a guide zone 26 of the back arm 14 in a substantially trapezoidal shape when the back arm 14 is mounted, and smoothly guide the back arm 14 to the locking adjustment screw 30 at the time of mounting. After the attachment, the back arm 14 can be reliably supported.
[0020]
A locking adjustment member 34 is provided which is attached to a locking adjustment screw 30 hung on the back surface of the chair 28 and has a spring 32 therein for adjusting the locking of the back arm 14.
[0021]
A rotation shaft 38 for tilting the back arm 14 to be rotatable rearward is provided on a mounting frame 36 on the back surface of the chair 28.
[0022]
In the figure, reference numeral 40 denotes a back, 42 denotes a column, and 44 denotes a leg.
[0023]
The method for attaching the back arm according to the present invention will be described below.
[0024]
The locking groove 16 formed at the distal end of the first horizontal portion 20 constituting the horizontal portion 12 of the back arm 14 is locked to the rotating shaft 38 of the mounting frame 36 on the back surface of the chair 28.
[0025]
At this time, the locking groove 16 can be smoothly locked to the rotating shaft 38 by the shape of the locking groove 16 inclined from the upper end of the first horizontal portion 20 to the inner lower side.
[0026]
Together with the locking of the locking groove 16 to the rotating shaft 38, the short hole 18 of the first horizontal portion 20 and the long hole 22 of the horizontal portion main body 24 are fitted into the locking adjustment screw 30 on the back surface of the seat 28.
[0027]
At this time, a substantially trapezoidal front guide zone 26 formed by the short holes 18 and the long holes 22 guides the back arm 14 smoothly during mounting.
[0028]
The horizontal portion 12 including the first horizontal portion 20 and the horizontal portion main body 24 is moved to a horizontal state.
[0029]
At this time, the inner edge (the left edge in FIG. 3) of the short hole 18 of the first horizontal portion 20 comes into contact with the locking adjustment screw 30, and this contact point, the locking groove 16 of the first horizontal portion 20, and the rotation shaft The position of the back arm 14 including the horizontal portion 12 can be securely fixed by the locking point with the fixing portion 38.
[0030]
The locking adjustment member 34 is screwed to the locking adjustment screw 30.
[0031]
At this time, by increasing or decreasing the amount of screwing of the locking adjustment member 34 into the locking adjustment screw 30, the elastic force of the spring 32 provided inside the locking adjustment member 34 is increased or decreased, and the locking force of the back arm 14 (back 40) is reduced. Adjust as appropriate.
[0032]
Thus, the back arm 14 is attached, and the chair is assembled.
[0033]
In the present example, the horizontal portion 12 of the back arm 14 is configured by the first horizontal portion 20 and the horizontal portion main body 24, but the first horizontal portion 20 and the horizontal portion main body 24 are integrally formed. Also, it is obvious that the first horizontal portion 20 and the horizontal portion main body 24 are integrated by forming the horizontal portion 12 into a mouth shape in cross section.
[0034]
The shape of the locking groove 16, the short hole 18, and the long hole 22 formed in the horizontal portion 12 of the back arm 14 correspond to the thickness (height) of the horizontal portion 12, the rotation shaft 38, and the locking adjustment screw 30. It is self-evident that the position can be appropriately changed and used.
[0035]
Although the mounting frame 36 is provided on the back surface of the seat 28 of the chair, it is obvious that the mounting frame 36 is omitted by integrally molding the seat 28 and the mounting frame 36.
[0036]
The chair in this example is a swivel chair, but may be a non-rotating office chair, and the type of chair is not particularly limited.
[0037]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the back arm mounting method and its structure of the chair which concerns on this invention, the locking groove of the horizontal part front-end | tip of a back arm is rotatably locked to the rotating shaft of a seat back surface, and the short hole and length of a horizontal part The hole is inserted into the locking adjustment screw, the horizontal portion is positioned horizontally, and then the locking adjustment member is screwed onto the locking adjustment screw to attach the spine arm. Work such as insertion and removal of pins, removal of pins, and the like can be eliminated, and even a purchaser can easily assemble.
[0038]
Further, since the attachment of the back arm is easy, the burden on the purchaser of the back arm for the purchaser is drastically reduced, the purchase motivation is increased, and the consumption of the chair can be drastically increased.
[0039]
Further, the horizontal portion of the back arm is constituted by a first horizontal portion having a locking hole formed at the tip and a short hole formed in the horizontal portion, and a horizontal portion main body having a long hole formed therein. In addition, the processing of the locking groove, the short hole and the long hole becomes easy, and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is an enlarged front view of a main part showing a back arm mounting structure for a chair according to the present invention.
FIG. 2 is a front view showing a process of assembling a horizontal portion of a back arm.
FIG. 3 is a plan view of the same.
FIG. 4 is an enlarged front view of a main part showing a state in which the back arm of the chair has been attached.
FIG. 5 is a front view showing the entire chair to which the back arm according to the present invention is attached.
FIG. 6 is a rear perspective view showing a conventional back arm mounting operation process.
FIG. 7 is a rear perspective view showing the same back arm mounting operation process.
[Explanation of symbols]
Reference Signs List 10 vertical portion 12 horizontal portion 14 back arm 16 locking groove 18 short hole 20 first horizontal portion 22 long hole 24 horizontal portion main body 28 seat 30 locking adjustment screw 32 spring 34 locking adjustment member 36 mounting frame 38 rotating shaft

Claims (2)

In a method of attaching a substantially L-shaped back arm (14) in which a horizontal portion (12) is formed at a lower end of a vertical portion (10),
A chair (28) for turning and locking the tip of the horizontal part (12) of the back arm (14)
The upper part is opened , and the locking groove (16) is formed on both sides of the tip so as to be opened to the outside . The first horizontal part (20) having a short hole (18) formed in the horizontal plane, and the lower part is opened. , engaging the horizontal portion of the back arm consisting configured with the horizontal plane of the short holes corresponding position was drilled long elongated hole (22) from Tan'ana (18) horizontal part main body (24) and (14) (12) groove (16),
While being rotatably locked,
To the locking adjustment screw (30) hanging on the back of the chair seat (28),
The short hole (18) and the long hole (22) of the horizontal part (12) of the back arm (14)
After positioning the horizontal part (12) of the back arm (14) horizontally while inserting it,
A method of attaching a back arm of a chair, comprising attaching a back arm (14) to a locking adjustment screw (30) by screwing a locking adjustment member (34) having a spring (32) therein. In a structure in which a substantially L-shaped back arm (14) in which a horizontal portion (12) is formed at the lower end of the vertical portion (10),
The horizontal part (12) of the back arm (14)
The first horizontal portion (20 ) is formed by opening the upper part, forming locking grooves (16) on both side surfaces of the tip to open to the outside, and forming short holes (18) along the length direction of the horizontal plane. ) And
A horizontal part main body (24) in which the lower part is opened and a long hole (22) longer than the short hole (18) is formed in a horizontal plane at a position corresponding to the short hole ,
Composed by
A locking adjustment member (34) with a spring (32) for adjusting the locking force of the back arm (14) is mounted on the locking adjustment screw (30) hanging from the back of the chair seat (28). Provided,
A rotation axis (38) of the back arm (14) is arranged on the back of the seat (28) of the chair,
Become
The locking groove (16) of the horizontal portion (12) of the back arm (14) is rotatably locked to the rotation shaft (38) on the back of the chair seat (28), and the chair seat (28) The horizontal portion (12) was positioned horizontally while the short hole (18) and the long hole (22) of the horizontal portion (12) of the back arm (14) were fitted in the locking adjustment screw (30) on the back surface. A back arm mounting structure for a chair, wherein the back arm (14) is mounted by screwing a locking adjustment member (34) to the locking adjustment screw (30).

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