Pipe joints or couplings – Serial,relatively movable portions – Having telescoping portion
Reexamination Certificate
1999-07-27
2001-05-29
Luu, Teri Pham (Department: 3627)
Pipe joints or couplings
Serial,relatively movable portions
Having telescoping portion
C285S261000, C285S906000, C285S111000
Reexamination Certificate
active
06237965
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to leak-free flexible conduit, and in particular to a pipe for connecting pipes together without causing leakage, especially to vary its sizes with the temperature changing and still maintain a leak free.
2. Prior Art
The conventional fluid pipe embedded underground requires to be expanded and shrunk with the change of temperature, therefore, they are all designed to be flexible adjustment. One type of which is shown as in
FIG. 8
which is mainly composed of a retaining bracket A, a connector B, a packing C, an outer sliding pipe D, an inner sliding pipe E, a gasket F, a fixture G and dust cover H. The retaining bracket A has a circular trough A
1
at inside to receive the outer sliding pipe D therein, and the retaining bracket A has a disc A
2
at the flange and is formed with apertures A
21
thereon. The outer sliding pipe D has a flat end and an arc end, respectively, whereas the flat end is formed with a block D
1
, thus the outer sliding pipe D is secured to the disc A
2
of the retaining bracket A by the connector B, with the arc end sleeved with a packing C and engages to the inner edge of the trough A
1
of the retaining bracket A. The connector B is covered by the dust cover H. Further, the inner sliding pipe E has a flange E
1
corresponding to the inner diameter of the outer sliding pipe D, and is connected to the block D
1
by means of a fixture G. The inside of the outer sliding pipe D has a gasket F which in corporation with the outer flange of the inner sliding pipe E forms a packing connection to prevent leakage. When the outer and the inner sliding pipes D and E are sliding with respect to each other, the block E
1
of the inner sliding pipe E will engage to the fixture G and confine its movement.
There are some shortcomings exist on the prior of art which are:
1. The packing C is sleeved in the center between the arc pipe of the outer sliding pipe D and the inner edge of the retaining bracket A, if the flexing angle is unbalancing, the packing C has an uneven force, thus fluid may be spilled from a loosen place of the connector.
2. The outer sliding pipe D and the inner sliding pipe E are connected by a fixture G which has not any connection with the outer sliding pipe D, when an earthquake happens, the outer sliding pipe D will flex which causes the block D
1
, the inner sliding pipe E and the fixture G to loose causing leakage.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a leak-free flexible conduit which is flexible and endurable to prevent fluid from leakage.
It is another object of the present invention to provide a leak-free flexible conduit which is easy to secure.
It is a further object of the present invention to provide a leak-free flexible conduit which is less expensive in manufacture.
REFERENCES:
patent: 3663043 (1972-05-01), Walton
patent: 3799586 (1974-03-01), Caras et al.
patent: 4618154 (1986-10-01), Freudenthal
patent: 4776617 (1988-10-01), Sato
patent: 4848808 (1989-07-01), Pannell et al.
patent: 5740839 (1998-04-01), Kuo et al.
patent: 5941576 (1999-08-01), Krausz
patent: 6056329 (2000-05-01), Kitani et al.
Luu Teri Pham
Rosenberg , Klein & Lee
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