Backrest structure of a chair, particularly a drum chair

Details Backrest structure of a chair, particularly a drum chair Backrest structure of a chair, particularly a drum chair

2000-01-27

2001-02-27

Barfield, Anthony D. (Department: 3636)

Chairs and seats

Movable back

C297S354100

Reexamination Certificate

active

06193315

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to the backrest for a chair, and particularly for a drum chair.
A backrest of a drum chair is used by a performer to rest between drum performances or to mitigate the instability of his posture by placing both of his legs on the pedal part simultaneously in connection with the use of a twin-bass or a twin drum pedal.
DESCRIPTION OF A PRIOR ART EMBODIMENT
The backrest of a drum chair is ordinarily a normal backrest used for an office chair or a business chair. The drum chair
90
shown in
FIGS. 9 and 10
is comprised of a backrest
91
, an L-shaped arm
93
and a seat
97
. One end of the L-shaped arm
93
is inserted into a holder
95
on the lower surface of the seat
97
, where the L-shaped arm
93
is fixed by a fixing screw F
1
. The position of the backrest in the back and forth direction with respect to the seat
97
is set by adjusting the depth of insertion of the L-shaped arm
93
into the holder.
At the other end of the L-shaped arm
93
, the backrest
91
is fixed by a fixing screw F
2
after insertion of the insert plate
92
of the backrest
91
into the insertion hole
93
a.
The height of the backrest
91
is set by adjusting the insertion depth of the insert plate
92
. For the chair to be transported, it is dismantled into the backrest
91
, the L-shaped arm
93
and the seat
97
. For use, these parts are reassembled.
The backrest of a chair used in an office, etc. is ordinarily shaped curved to accommodate the shape of the back of a man, with many being sized to fit the width of a human being. This makes it possible for the performer's back to contact the backrest during a performance. As a result, the chair tends to move and threatens to tumble in the worst case.
In addition, it is desirable to adjust the position of the backrest according to the preference or the body type of the performer. In the conventional chair shown in
FIG. 9
or
FIG. 10
, for example, if the L-shaped arm
93
is lightly inserted into the holder
95
, the fixing between the L-shaped arm
93
and the holder
95
tends to loosen when the performer starts resting on the backrest. As a result, the L-shaped arm
93
is almost always deeply inserted.
Moreover, adjustment of the height of the backrest
91
has been limited to the depth of the insertion hole
93
a
of the L-shaped arm
93
, and it is not extendable to a full range as desired by the performer.
Moreover, a compact construction is desirable to make it easier to transport the chair. In a conventional chair, dismantling of the fixed screw F
1
alone does not make the chair compact enough, and the extra dismantling of the fixed screw F
2
is required. This makes it unsatisfactory as the backrest of a drum chair.
SUMMARY OF THE INVENTION
This invention has an object of solving the foregoing problems. It provides a backrest structure for a chair, particularly a drum chair, which does not pose an obstacle to the performer, which can be adjusted at the desire of the performer, and is of a compact construction, making it easier to transport.
The backrest, particularly of a drum chair, of the invention has a structure in which the backrest is freely adjustable in its height and its tilt angle with respect to the seat and it can be detached when necessary. The chair comprises a main base body which is fixed to the seat and which has an upstanding part on the back of the seat, a main backrest body where the backrest part is installed and which comprises two arms at the right and at the left, with a certain distance between them, an arm holder which is comprised of a support which is held freely rotatably in the back and forth direction through an axle at the standing part of the main base body, and arm sliding part which contacts the inner surfaces of the right and left arms. An arm fixing screw is protuberantly provided on the inner side of the said arm sliding part. A screw hole is formed in opposition to the upstanding part of the main base body. An arm holding plate has a through hole into which the arm fixing screw is inserted and that plate has flanges which slidingly contact the outsides of the right and left arms. The height of the arm holding plate is such that it can be accommodated inside the arms at the right and at the left when that plate is rotated 90 degrees, with the said insertion hole at its center. A front and back adjusting screw is screwed into a threaded part of the arm holder and includes a contact part which contacts the upstanding part of the main base body at the tip of that screw. The arm holder is rotatable around its axle upon the movement of the contact part by the screw. An arm fixing nut is screwed from outside of the arm holding plate onto the arm fixing screw of the arm holder for setting the backrest height.
Other objects and features of the present invention are explained below with reference to the attached drawings.


REFERENCES:
patent: 1000814 (1911-08-01), Johnson
patent: 2988398 (1961-06-01), Hamilton
patent: 3059971 (1962-10-01), Becker

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