Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Casters – Wheels
Reexamination Certificate
2002-11-27
2004-06-15
Mah, Chuck Y. (Department: 3676)
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Casters
Wheels
C016S03500D, C016S045000
Reexamination Certificate
active
06748623
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a chair caster, particularly to one having two wheel bodies each provided with a recessed chamber disposed in an inner side thereof and capable of being fitted with a shake-proof washer made of a soft rubber material, thereby enabling the chair caster to lower shaking and noise in rolling under the resilience of the shake-proof washers and providing better strength to the whole structure of the chair caster so as to prolong the working life.
2. Description of the Prior Art
Generally speaking, a known conventional chair caster
1
, as shown in
FIG. 1
, has a wheel holder
10
, a mounting seat
11
disposed above the wheel holder
10
, and a wheel body
13
disposed below the wheel holder
10
and capable of being pivoted with the wheel holder
10
by a wheel axle
12
. After the mounting seat
11
is combined with a lower portion of a chair, the wheel body
13
can roll to move the chair. However, the wheel body
13
made of a hard material will make much noise when rolling on the hard ground to influence the surrounding quietness and often shake all the way in rolling to make a user feel very uncomfortable.
Another known conventional chair caster
2
, as shown in
FIG. 2
, has a wheel holder
20
, a wheel axle
23
and two wheel bodies
24
. The wheel holder
20
has a spindle
22
disposed at an upper portion thereof, and a through hole
21
disposed therein in a transversal direction and capable of being extended through by the wheel axle
23
. Each of two wheel bodies
24
has a hollow inner side disposed opposite to each other and provided with an axle housing
25
protruding thereon and a plurality of reinforced ribs
26
disposed therein. The two wheel bodies
24
can be combined with both sides of the wheel holder
20
by having the two axle housings
25
respectively engaged with both ends of the wheel axle
23
. After the spindle
22
is combined with a lower portion of a chair, the chair caster
2
can roll to move the chair. Although such chair caster
2
can make less noise in rolling, it still lacks a shake-proof effect because the hollow inner sides of the two wheel bodies
24
make circumferential walls of the two wheel bodies
24
become very thin, which is unable to provide enough strength to support the structure of the two wheel bodies
24
so that the two wheel bodies
24
are easily damaged when impacted by outer force, thus greatly shortening the working life.
SUMMARY OF THE INVENTION
The main purpose of the invention is to offer a chair caster capable of lowering the shaking and noise of a chair in moving.
The main feature of the invention is to provide a chair caster having two wheel bodies each provided with a recessed chamber and a shake-proof washer, wherein the recessed chamber is disposed in an inner side of each of the two wheel bodies so that a circumferential wall with thinner thickness with thinner thickness is formed between the recessed chamber and an outer wall surface of each of the two wheel bodies; the shake-proof washer made of a rubber material is capable of being fitted in the recessed chamber.
REFERENCES:
patent: 3815173 (1974-06-01), Haussels
patent: 4054964 (1977-10-01), Kaneko
patent: 4077088 (1978-03-01), Melara
patent: 4219904 (1980-09-01), Melara
patent: 4351084 (1982-09-01), Fontana
patent: 4377883 (1983-03-01), Folson
patent: 4649595 (1987-03-01), Shane
patent: 4707881 (1987-11-01), Van Hoye
patent: 5119525 (1992-06-01), Melara
patent: 5259088 (1993-11-01), Yang
patent: 11-180103 (1999-07-01), None
patent: 2002-211204 (2002-07-01), None
patent: 2003-2004 (2003-01-01), None
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