Brakes – Wheel – Frictional and positive
Reexamination Certificate
2001-10-03
2002-07-02
Lavinder, Jack (Department: 3683)
Brakes
Wheel
Frictional and positive
C188S266000, C188S271000, C188S281000, C188S381000, C267S205000, C267S293000
Reexamination Certificate
active
06412606
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damper and, more particularly, to such a damper that enables the user to adjust the damping force accurately.
2. Description of the Prior Art
In a regular oil damping device, a piston is moved in a cylinder to squeeze a fluid (oil) out of an oil hole or valve. The fluid buffers the moving speed of the piston. This structure of oil damping device cannot eliminate oil leakage after a long sue.
FIG. 1
shows a damper that eliminates the use of a fluid. This structure of damper comprises a cylinder
12
, the cylinder
12
having a cylinder chamber
12
c,
, and two end holes
12
d
in two end walls thereof, a stop rod
16
axially slidably inserted through the end holes
12
d
of the cylinder
12
, the stop rod having an outer thread
16
c,
a nut
14
disposed inside the cylinder
12
and threaded onto the outer thread
16
c
of the stop rod
16
, a steel ball
182
, a compression spring
181
mounted in a side hole of the cylinder
18
and pressed on the steel ball
182
against the nut
14
, and an adjustment screw
18
threaded into the side hole of the cylinder
18
and stopped at the compression spring
181
against the steel ball
182
. This structure of damper is not easy to assemble. Further, because the friction force between the nut
14
and the stop rod
16
is high, the user cannot accurately adjust the damping force of this structure of damper.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a damper, which enables the user to adjust the damping force accurately. It is another object of the present invention to provide a damper, which is easy to assemble. It is still another object of the present invention to provide a damper, which can be used as a positioning structure. According to one aspect of the present invention, the damper comprises a barrel axially slidably mounted on a shaft, an elastic ring mounted inside the barrel around the shaft, arched pressure blocks mounted abutted against one another inside the elastic ring around the shaft, each arched pressure block having an axially extended sloping groove, steel balls respectively arranged in the sloping groove of each arched pressure block in contact with the periphery of the shaft, a rigid locating ring mounted inside the barrel to support the steel balls in the sloping groove of each arched pressure block, a screw cap threaded into one side of the barrel, a compression spring stopped between the screw cap and the locating ring, a hollow adjustment screw member threaded into one side of the barrel to support the steel balls in the sloping groove of each arched pressure block against the locating ring. According to another aspect of the present invention, a return spring is provided between the shaft and the adjustment screw member for quick return of the barrel.
REFERENCES:
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patent: 4093042 (1978-06-01), Pradon
patent: 4094387 (1978-06-01), Pelat et al.
patent: 4291416 (1981-09-01), Hoeptner, III
patent: 4457741 (1984-07-01), Hoeptner, III
patent: 4545322 (1985-10-01), Yang
patent: 4577732 (1986-03-01), Gottling
patent: 4957313 (1990-09-01), MacIntyre et al.
patent: 4962674 (1990-10-01), Payne
patent: 5115889 (1992-05-01), Fortmann et al.
patent: 5689995 (1997-11-01), Heckel, Jr.
patent: 5871235 (1999-02-01), Wier
patent: 5988342 (1999-11-01), Ito et al.
patent: 6325322 (2001-12-01), Wu
Kramer Devon
Lavinder Jack
Rosenberg , Klein & Lee
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