Pipe joints or couplings – Essential catch – Leaf spring
Reexamination Certificate
2000-04-10
2003-04-01
Swann, J. J. (Department: 3677)
Pipe joints or couplings
Essential catch
Leaf spring
C285S338000, C285S344000, C285S347000, C285S349000, C285S350000, C285S918000, C277S627000, C277S650000, C277S652000, C277S910000, C277S935000, C277S938000, C277S946000
Reexamination Certificate
active
06540264
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an improved quick connector for piping. A detachable universal joint (coupling) for piping (whose representative examples include a one-touch coupler and a quick coupler) will be referred to as “quick connector in this specification.
2. Description of the Related Art
One known quick connector for piping is disclosed in Japanese Utility Model Unexamined Publication No. Hei. 6-28485 entitled “QUICK CONNECTOR”.
FIG. 7
is across-sectional view of the conventional quick connector for piping according to the above publication, and this quick connector for piping
100
serves to detachably connect a male member
102
to a female member
101
.
The female member
101
comprises a socket housing
104
, in which an O-ring
105
, a collar
106
and an O-ring
107
are inserted in this order, and a socket cap
108
in which a retainer
109
is movably received. The socket cap
108
is threaded on the socket housing
104
through a bushing
111
.
The male member
102
comprises a pipe-like member, and has a projection
102
a
formed on an outer surface of an intermediate portion thereof, and this projection
102
a
is adapted to be fitted in the retainer
109
of the female member
101
.
Next, the operation of the quick connector for piping will be described.
FIGS. 8A and 8B
are views explanatory of the operation of the conventional quick connector for piping according to the above publication.
In
FIG. 8A
, the male member
102
is connected to the female member
101
through the O-ring
105
. This O-ring
105
serves to prevent a fluid from leaking through a gap between the female member
101
and the male member
102
, and those regions (4 regions), indicated by sign X in
FIG. 8A
, are seal portions.
In
FIG. 8B
, when the quick connector for piping
100
is mounted on a vibratory body such as a vehicle, the male member
102
is repeatedly moved relative to the female member
101
in the direction of the axis of the quick connector for piping
100
by the vibration as indicated by arrow b
1
. When the male member
102
thus moves in the axial direction, the male member
102
carries the O-ring
105
in the axial direction. As a result, torsion and a depression develop in the O-ring
105
, which can adversely affect the performance of the seal between the female and male members
101
and
102
.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a quick connector for piping in which torsion and a depression are prevented from developing in an O-ring, thereby ensuring a high reliability of the quick connector.
The above object has been achieved by a quick connector for piping of the invention for detachably connecting a male member to a female member, wherein an O-ring is interposed between the female member and the male member so as to form a seal therebetween; and the O-ring is subjected to a low-friction treatment so that the O-ring can be moved in a direction of an axis of the quick connector by a pressure of an employed fluid.
The male member is connected to the female member through the O-ring, so that the O-ring forms a seal between the female member and the male member.
The O-ring is subjected to the low-friction treatment so that the O-ring can be moved in the direction of the axis of the quick connector by the pressure of the employed fluid. When the pressure of the employed fluid acts on the O-ring, the O-ring is pressed in one direction (the direction of the axis of the quick connector). The O-ring is subjected to the low-friction treatment, and the pressure of the employed fluid acts on the O-ring, and therefore even when the male member is moved relative to the female member in the axial direction, the male member will not carry the O-ring. Therefore, the O-ring is kept stationary in a predetermined position regardless of the movement of the male member.
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Takeuchi Kazuo
Yokoyama Kazutaka
Honda Giken Kogyo Kabushiki Kaisha
Lugo Carlos
Swann J. J.
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