Chairs and seats – Movable bottom – Bottom and back movable as a unit
Reexamination Certificate
1999-07-02
2001-08-21
Barfield, Anthony D. (Department: 3624)
Chairs and seats
Movable bottom
Bottom and back movable as a unit
C248S161000, C248S404000, C248S631000
Reexamination Certificate
active
06276756
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to height adjusting mechanism for a chair which stands between a seat and legs of a chair. Furthermore, the present invention is about adjusting height of a chair simply and easily by operating a button which is attached at the arm of a chair. In the height adjusting mechanism for a chair, cable actuator is installed to adjust the height and the button is included in the cable actuator.
2. Description of the Background Art
In the conventional height adjusting mechanism for a chair, a spindle guide
500
is inserted and fixed inside a cylindrical outer tube
600
and a spindle
50
which moves up and down while contacting the inner side of the spindle guide
500
is installed as shown in
FIG. 1
which is a vertical cross sectional view. A Gas chamber
30
is included inside the spindle
50
and a piston
11
which engages in piston movement according to the pressure of gas is inserted inside the gas chamber
30
. The gas chamber
30
is divided into a first gas chamber
30
a
and a second gas chamber
30
b
along the boundary of the piston
11
. The piston
11
is connected to a piston rod
110
which penetrates the second gas chamber
30
b
and one end of the piston rod
110
is fixed to the cylindrical outer tube
600
with a fixing clip
235
. A resilience member
620
is inserted at a lower end of the piston rod
110
in order to absorb shock on the outer tube
600
put by the lower end of the piston rod
110
when the spindle
50
moves up and down due to the movement of the piston and to maintain certain resilience. A ball bearing
52
is sandwiched in between bearing support
42
and
44
inserted at a lower end of the resilience member
620
. A movement preventing jaw
35
is formed at a lower end of the piston rod
110
in order to prevent the bearing support
42
,
44
and the ball bearing
52
from moving up towards upper part of the piston rod
110
. As the resilience member and the ball bearing are inserted in the piston rod, shock put on the spindle
50
is absorbed and rotation frictional force of the spindle
50
is reduced.
An opening/closing pin holder
400
which is made of sealing member is mounted outside the first gas chamber
30
a
and the opening/closing pin
120
which can discharge or block gas of the first gas chamber
30
a
is mounted on an opening/closing pin holder
400
. Projected end of the opening/closing pin
120
is formed to contact a push button
33
which is attached at an end of the spindle
50
. A gas moving valve
160
is formed at an outer wall of a gas chamber
30
so that the first gas chamber
30
a
and second gas chamber
30
b
can move along by the operation of the opening/closing pin
120
. In addition, a plurality of O-rings
608
are inserted outside the piston
11
and the opening/closing pin holder
400
in order to maintain sealing and prevent gas inside cylinder from leaking.
In the conventional height adjusting mechanism for a chair structured as described above, height of a chair is adjusted as gas inside the first gas chamber
30
a
and the second gas chamber
30
b
moves back and forth the two chambers through the gas moving valve
160
as the entrance of the first gas chamber
30
a
which is blocked by the opening/closing pin
120
is opened by pushing the push button
33
which is located at an end of the spindle
50
and as the spindle
50
moves according to the movement of the gas. In order to maintain the height of a chair, simply let the opening/closing pin
120
block the entrance of the first gas chamber.
In the conventional height adjusting mechanism for a chair, an extra operating lever
88
needs to be installed at the lower part of a chair to push the push button
33
as the push button
33
is attached at the lower part of the spindle
50
as shown in FIG.
2
. Therefore, in order to adjust the height in a chair manufactured with the conventional method, a person sitting on the chair has to bend over to operate the lever which results in inconvenience in operating the lever and unpleasant outlook due to the projected lever.
SUMMARY OF THE INVENTION
In order to settle the above-mentioned disadvantages of the prior art, the present invention has a height adjusting assembly which includes a gas chamber in which a piston is positioned, a spindle having a piston rod which is engaged with the piston and an opening/closing pin which opens and closes the gas chamber to control movement of the spindle, wherein the piston rod is fixed to one end of an outer case to which a spindle is partially inserted into the spindle guide to move upwardly and downwardly along the spindle guide which comprises:
a first member having a taper holder positioned near the opening/closing pin and a taper arm engaged with the taper holder so as to push the opening/closing pin;
a second member having a case, a lead arm engaged with the case and a button which operates the lead arm; and
a third member having a wire in which one end is fixed to the taper arm and the other end is fixed to the lead arm and a covering member in which one end is fixed to the taper holder and the other end is fixed to the case so that the wire is slidable in the covering member and the opening/closing pin being pushed by the operation of the taper arm is engaged with the wire when the lead arm is operate by the button.
The taper arm of the first member is combined to the taper holder with a fixing pin, a first extension member and a second extension member is formed to be in opposition with a certain degree to a fixing part having the fixing pin in the center, the first extension member is to push the opening/closing pin and an end of the wire is fixed to an end of the second extension member.
The length of the second extension member is longer than that of the first extension member and is equal to and longer than 30 mm.
A wire fixing recess is included at an end of the second extension member, a fixing portion is included in an end of the wire and the fixing portion is to be inserted and fixed at the wire fixing recess.
The taper arm is bent with a certain degree outwards the taper holder from the central part of the second extension member.
REFERENCES:
patent: 5636899 (1997-06-01), Schiff et al.
patent: 5826935 (1998-10-01), DeFreitas
patent: 5829733 (1998-11-01), Becker
patent: 6045187 (2000-04-01), Stumpf
Cho Yong Tae
Hur Song
Barfield Anthony D.
Birch & Stewart Kolasch & Birch, LLP
Samhongsa Co. Ltd.
LandOfFree
Height adjusting assembly for a chair does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Height adjusting assembly for a chair, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Height adjusting assembly for a chair will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2486132