Elevation mechanism for armchair armrest

Details Elevation mechanism for armchair armrest Elevation mechanism for armchair armrest

2001-05-25

2002-07-16

Brown, Peter R. (Department: 3636)

Chairs and seats

Armrest

Adjustable to multiple use positions relative to bottom or back

C297S411350

Reexamination Certificate

active

06419323

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention provides an elevation mechanism for an armchair armrest, particularly a mechanism that enables the user to adjust the height of an armchair armrest at any time.
2. Background of the Invention
As shown in
FIGS. 6 and 7
, the conventional elevation mechanism for an armchair armrest is designed to include a base unit
36
at the bottom of a T-shaped post
35
, which accommodates the insertion of a rod
37
. The combination of a semi-circular slide track
38
and a semi-circular seat
41
is wrapped by a protective cylinder
42
. Inside the semi-circular slide track
38
is a check track
39
and a slide track
40
. With the above design, the rod
37
inserted on the base unit
36
of the T-shaped post
35
works with the slide track
40
and the check track
39
of the semi-circular slide track
38
to adjust the height of an armrest. However, such design has the following shortcomings.
The mechanism of such design can elevate the height, but it must be pulled to the top when it goes beyond a specified height. Thus, the armrest must be reduced to the bottom before the armrest can be adjusted upward again.
During the process when moving the chair within an area or between areas, most people would hold on to the armrest, which may cause damage to said mechanism, resulting in failure to adjust the height of the armrest.
In view of the defective design and its shortcomings, the inventor has devoted to seek a better design for improvement.
BRIEF DESCRIPTION OF THE INVENTION
The objective of this invention is to provide an elevation mechanism for an armchair armrest which can adjust the height of the armrest without having to repeat the adjustment process once the height is adjusted to a level higher than a specified height, so that the user can elevate or lower the armrest at any time.


REFERENCES:
patent: 5318347 (1994-06-01), Tseng
patent: 5393124 (1995-02-01), Neil
patent: 5435626 (1995-07-01), Lai
patent: 5620233 (1997-04-01), Corwin
patent: 5895095 (1999-04-01), Chen
patent: 6035579 (2000-04-01), Nelson et al.

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