Supports – Stand – Standard type
Reexamination Certificate
1998-08-05
2002-04-16
King, Anita (Department: 3632)
Supports
Stand
Standard type
C248S622000, C384S609000, C384S620000, C188S300000
Reexamination Certificate
active
06371421
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device controlling the height of a swivel chair which is placed between the seat and the legs of the chair. The present invention more particularly relates to keeping components in place after inserting the components into a piston rod of a cylinder of the device, improving working conditions, and accommodating the operation and rotation of the chair.
2. Description of the Related Art
One example of a device controlling the height of a conventional swivel chair is shown in
FIG. 1
, an exploded view, and
FIG. 2
, a cross-sectional view.
A cylinder guide
602
is inserted into a hollow cylindrical outer case
600
, and a cylinder
12
is inserted into the cylinder guide
602
.
An elastic component
620
is fitted to the end of a piston rod
610
which is placed at the bottom of the cylinder
12
. The elastic component
620
absorbs shocks given to the cylinder
12
as the piston rod
610
moves up and down in relation to the cylinder
12
. Bearing supports
42
and
44
, and a ball bearing component
50
are placed on the end of the piston rod
610
.
The bearing supports
42
and
44
, and the ball bearing component
50
do not move upward from the end of the piston rod
610
due to a swollen portion
35
which is formed at the piston rod.
A ball bearing
52
is inserted into the ball bearing component
50
, and the ball bearing component
50
is sandwiched between the bearing supports
42
and
44
to allow the cylinder
12
to rotate even though weight is applied to the ball bearing component
50
through the body
605
of the cylinder and the elastic body
620
.
The bottom of the piston rod
610
, which is inserted into the elastic body
602
, the ball bearing component
50
and the bearing supports
42
and
44
is placed on a fixer
100
which is extended from the bottom of the outer case
600
. The piston rod
610
is fixed to the outer surface of the fixer
100
by inserting a clip
230
into a hole
250
formed in the end of the piston rod
610
.
The fixer
100
and the outer case
600
are formed in one body, and the piston rod
610
is fixed to the fixer
100
so that the body
605
of the cylinder
12
can move up and down in the cylinder guide
602
by using a gas or an oil pressure in the cylinder.
The hollow cylindrical outer case is fixed to the base of the chair, and the top of the cylinder
12
is fixed to the seat of the chair so that it is possible to rotate the chair and to control the height of the chair.
The device controlling the height of the conventional swivel chair is already well known to those skilled in this art. The inner structure of the cylinder
12
is described below.
A wall
604
is in contact with the inner surface of the body
605
of the cylinder. An airtight hull/component
606
which includes rings
607
is placed on the top of the wall
604
in order to contain a fluid substance
700
in the chamber of the cylinder without leakage. A piston
608
which moves up and down via the fluid substance
700
is placed at the bottom of the wall
604
, and the piston rod
610
is attached to the piston
608
.
A button
33
is placed on the top of the airtight hull
606
, which is connected with a cock
88
through which the fluid substance
700
enters and exits. Preferably, the cock is formed in the airtight hull
606
.
The height-controlling device of the conventional swivel chair described above has the following problem. The components, i.e. the bearing support and the ball bearing component, are easily detached when the piston rod
610
of the cylinder
12
is fixed to the fixer
100
of the outer case
600
, resulting in the increase in the manufacturing time.
In order to fix the piston rod
610
of the cylinder
12
to the fixer
100
, first, the end of the piston rod
610
is inserted through the elastic body
620
, the bearing supports
42
and
44
, and the ball bearing component
50
, and the cylinder
12
including the piston rod
610
is inserted through the cylinder guide
602
which is inserted into the outer case
600
until the hole
250
which is formed at the end of the piston rod
610
emerges through the fixer
100
. The bearing supports
42
and
44
, and the ball bearing component are loosely fitted onto the piston rod
610
. Therefore, if the piston rod is inserted carelessly, the bearing supports and the ball bearing are detached easily.
In addition, the manufacturing time is increased because the piston rod must be fixed to the fixer slowly and carefully in order to prevent the detachment of the bearing supports and the ball bearing component.
Furthermore, the outer case
600
and the cylinder
12
can be stored separately. When they are stored separately, the bearing supports
42
and
44
, and the ball bearing component
50
must also be stored separately with care in order to prevent their loss. This results in added inconvenience.
SUMMARY OF THE INVENTION
An objective of the present invention is to eliminate the problems mentioned above, i.e. to prevent the detachment of the elastic body
620
, the bearing supports
42
and
44
, and the ball bearing component
50
.
Another objective of the present invention is to improve work conditions by preventing the detachment of the elastic body
620
, the bearing supports
42
and
44
, and the ball bearing component
50
.
A height-controlling device of a swivel chair according to the present invention is comprised of an elastic body, bearing supports and a ball bearing component which are fitted to the end of a piston rod of a cylinder; and a retaining washer which keeps the elastic body, the bearing supports and the ball bearing in place. The cylinder is inserted into a hollow cylindrical outer case which encloses a cylinder guide. The retaining washer is placed on the inner surface of a fixer of the outer case. The end of the piston rod which emerges from the outer case is fixed on the outer surface of the fixer.
Another height-controlling device of a swivel chair of the present invention is comprised of an elastic body, a bearing support and a thrust bearing which are fitted to the end of a piston rod of a cylinder. In order to prevent detachment of the elastic body, the bearing support and the thrust bearing, the thrust bearing is tightly fitted to the piston rod. The cylinder is inserted into a hollow cylindrical outer case which encloses a cylinder guide. The thrust bearing is placed on the inner surface of a fixer of the outer case, and the end of the piston rod which emerges from the outer case is fixed on the outer surface of the fixer.
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patent: 6079690 (2000-06-01), Yoon
Ma Dong Kwan
Yoon Young Ki
King Anita
Samhongsa Co. Ltd.
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