Chairs and seats – Armrest – Adjustable to multiple use positions relative to bottom or back
Reexamination Certificate
2000-07-28
2001-04-10
Cranmer, Laurie K. (Department: 3636)
Chairs and seats
Armrest
Adjustable to multiple use positions relative to bottom or back
C297S411370, C297S411380
Reexamination Certificate
active
06213556
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to chair arm and more particularly to an extendible arm used in an office chair.
BACKGROUND OF THE INVENTION
Conventionally, an arm of an office chair is either fixed or adjustable with respect to height. However, there is a gap between either type of above arms. As such, no support provided by such arms for elbow portion as one person uses for example a computer. Such elbow suspension may easily cause fatigue. This is one of the drawbacks of conventional chair arm.
An exploded view of a conventional chair arm is shown in
FIG. 1
wherein rail member A is open to the top. As such, rear portion of rail member A is open when sliding member B moves forward relative to rail member A. But this is unsatisfactory for the purpose for which the invention is concerned for the following reasons:
1. Foreign objects may drop into the open portion of rail member A to clog the sliding member B. Further, it may hurt a child's fingers if child's hand is put on that open portion of rail member A.
2. Sliding member B is structurally complex. Also, a rubber block B
1
is required to engage with sliding member B. Furthermore, a stopper A
1
is provided in the front portion of rail member A to limit the movement of sliding member B. This results in an increase of manufacturing cost.
Thus, it is desirable to provide an improved chair arm in order to overcome the above drawbacks of prior art.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an extendible chair arm which has the feature of rail member being implemented in a closed configuration such that foreign objects may not drop into rail member to clog sliding member as well as prevent sliding member from hurting hand.
It is another object of the present invention to provide a simplified extendible chair arm for reducing the manufacturing cost.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
REFERENCES:
patent: 5380065 (1995-01-01), Rohrer
patent: 5975640 (1999-11-01), Chen
patent: 6059366 (2000-05-01), Hu
patent: 6074012 (2000-06-01), Wu
Cranmer Laurie K.
Pro-Techtor Inter-national Services
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