Expansible chamber devices – Cylinder detail
Reexamination Certificate
2002-11-14
2004-10-19
Look, Edward K. (Department: 3745)
Expansible chamber devices
Cylinder detail
C092S164000
Reexamination Certificate
active
06805039
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to oil pressure cylinders, and particularly to an oil pressure cylinder having a well defined adjusting ring which is prolonged so as to provide a larger torque to assist the work of rotation.
BACKGROUND OF THE INVENTION
Oil pressure cylinders serve to provide shock-proof ability or resistance to other devices. However, for a long using time, it is often the parts within a oil pressure cylinder are worn out so that the sealing washer can not effectively prevent the drainage of oil. Therefore, an adjusting ring is designed. The adjusting ring is engaged to a control portion of the oil pressure cylinder.
With reference to
FIG. 1
, a prior art adjusting ring is illustrated. the adjusting ring is mainly formed by an operation rod
10
, a buffer washer
20
, an adjusting ring
30
. An outer side of the adjusting ring
30
has a spring
31
. A lower half of the adjusting ring
30
is connected to an outer tube
40
. A lower end of the outer tube
40
is connected to a fixing rod
50
.
From the drawing, it is appreciated that the adjusting ring
30
is formed by two shorter portions. A metal spring
31
is tightly buckled to screws
33
on the screw holes
32
at the upper end of the adjusting ring
30
.
However, when the oil pressure cylinder is used, it is often that the length of the adjusting ring
30
is insufficient so as to affect the work. Moreover, referring to
FIG. 2
, an exploded view of a prior art oil pressure cylinder is illustrated. It is shown that the oil pressure cylinder is formed by an operation rod
10
, a buffer pad
20
, a pressure adjusting ring
30
, a spring
31
, a steel tube
60
, a dust-proof washer
61
, a selecting seat
62
, a sealing washer
63
, a piece washer
64
, a spring
65
, a support seat
66
, and an oil circuit adjusting seat
67
. A set of buffer device
70
is installed after the above said components. The buffer device
70
has a nut
71
which is screwed with a threaded portion of the inner tube
80
at a distal end of the operation rod. At this assembly (with reference to the cross sectional view of FIG.
3
), when the sealing washer in the steel tube
60
is combined to the selecting seat, the combining surface of the selecting seat
62
is an inclined surface for matching the inclined surface in the selecting seat
62
. Thereby, the sealing washer
63
and the selecting seat
621
are contact to one another by the inclined surface for sealing the pressurized oil in the tube. When the operation rod
10
extends and contracts reciprocally under a pressure, oil will drain out from the inclined surfaces. For a longer time, the sealing washer
63
will lose of functions. Thereby, the prior art is necessary to be improved.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide an oil pressure cylinder comprising an operation rod, a buffer washer, an adjusting ring, a rubber ring, an outer tube and a fixing rod; an interior of the oil pressure comprising a steel tube, a dust-proof washer, a selecting seat, a sealing washer, a washer piece, a spring, a support seat and an oil circuit adjusting seat; and a spring, a support seat and an oil circuit adjusting seat; and a buffer device.
The adjusting ring is prolonged and is formed by two parts which are buckled with one another. An elastic element is used to buckle the adjusting ring. The spring is embedded at a slot at an outer side of the adjusting ring so as to tightly seal the adjusting ring. The sealing washer in the steel tube has a plane shape and has a convex ring. An outer side of the convex ring is enclosed by an elastic wearing compensating spring; a connecting portion of the selecting seat with the adjusting ring is formed as a plane for matching the plane sealing washer.
Moreover, in the present invention, the adjusting ring is formed integrally, the adjusting ring has an opening, the opening has two parallel long sides and two parallel short sides, four corners of the opening are cambered; in interior of the adjusting ring has a plurality of blocks.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
REFERENCES:
patent: 6076814 (2000-06-01), Grundei
patent: 6443271 (2002-09-01), Schmidt
Leslie Michael
Look Edward K.
Pro-Techtor Inter-national Services
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