Pipe joints or couplings – Packed – Wedge
Reexamination Certificate
1999-01-20
2001-06-05
Luu, Teri Pham (Department: 3627)
Pipe joints or couplings
Packed
Wedge
C285S323000
Reexamination Certificate
active
06241292
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a Coupling Device for metal pipes with innovative packing structure.
2. Discussion of the Conventional Art in the Similar Field
Drawings (
4
) and (
5
) are enclosed hereby for explaining the conventional coupling device with conventional packing structure.
A conventional coupling device (
FIG. 4
) for metal pipes comprises a Cup-joint(A), a Packing Bushing(B), a Padding Bushing(C) and a Bridging Connector(D). The Cup-joint(A) featuring a Side-ring(A
1
) at one end yields a Holding Hole(A
11
) and a Confining Face(A
12
) on the inner face inside the Cup-joint itself, wherein the Packing Bushing(B) and the Padding Bushing(C) are held and confined. The Packing Bushing(B) featuring a ring of Packing Fortifiers(B
1
) on one inner edge is coupled and confined in the Confining Face(A
12
) of the Cup-joint(A) and in turn the Padding Bushing(C) featuring a Converging Ending(C
1
) is coupled and confined inside the Packing Bushing(B), such that the Fortifier Ring(B
1
) is coupled to the Side-ring(A
1
) of the Cup-joint and the Converging Ending(C
1
) is coupled to the Guiding Face(D
1
) of the Bridging Connector(D). When (A), (B), (C) and (D) four parts are fixed together, the conventional Coupling Device is completed to yield a Holding Hole(A
11
) for holding two ends of two separate metal pipes together.
The feature of the conventional Coupling Device is that, when the Cup-joint(A) is screwed to the Bridging Connector(D), the Converging Ending(C
1
) will get into the Guiding Face(D
1
) and thus seals up the gap in between the connector(D) and the Metal Pipe(E). On the other hand, the whole Padding Bushing(C) is pushed by the Guiding Face (D
1
) against the Fortifiers(B
1
) of the Packing Bushing. As a result, the indentation structure of the Fortifier Ring are forced by the Padding Bushing(C) to change form and clasp the metal pipe tightly. The sealing effect of the Padding Bushing and the clasping force of the Fortifiers will increase as the force to screw the Cup-joint to the Bridging Connector increases. In practice, since the screwing force is only conducted by the Confining Face(A
12
) of the Cup-joint(A), it requires a great force to push the Converging Ending in and change the shape of the Fortifier-indentation. The conventional coupling device is obvious in a crude and unrefined stage. It requires innovation.
SUMMARY OF THE INVENTION
In view of the insufficiency of the conventional coupling device, the present invention is directed to a coupling device for metal pipes with innovative packing structure which ensures excellent sealing and clasping effect between the coupling device and the metal pipes.
To achieve the innovation, the inventor of prevent invention has designed a new set of coupling device (
FIG. 1
) which comprises a Cup-joint, an innovative Packing Bushing, an innovative Padding Bushing and a Bridging Connector.
The Cup-joint featuring a Side-ring at one end yields a Holding Hole and a Confining Face on the inner face of the Cup-joint itself, wherein the Packing Bushing and the Padding Bushing are held and confined. The innovative Packing Bushing featuring an indented ring of Packing Fortifiers round one of the two rims is coupled and confined in the Confining Face of the Cup-joint And in turn the innovative Padding Bushing featuring a Converging Ending at one rim and an indented ring of fortifiers at another is coupled and confined inside the Packing Bushing, such that the indented Fortifier Ring of the Packing Bushing is intimately matched to the indented Fortifier-ring of the Padding Bushing. That is, the Fortifiers of one Busing are precisely configured to go into the recesses of the other, while the Converging Ending of the Padding Bushing matches to the Guiding Face of the Bridging Connector. When the Cup-joint, the Packing Bushing, the Padding Bushing and the Bridging Connector are fixed together, an innovative Coupling Device is set up to yield a Holding Hole centrally for holding two ends of two separate metal pipes together.
The feature of this innovative Coupling Device is that, the indentation ring of the Packing Busing and Padding Busing are matched together to be jointly confined to the Confining Face of the Cup-joint. When the Cup-joint is screwed to the Bridging Connector, the Converging Ending of the Padding Bushing will get into the Guiding Face of the Bridging Connector and thus seal up the gaps in between the connector and the Metal Pipe. On the other hand, the whole Packing Bushing and Padding Bushing combination is concurrently pushed and squeezed by the Guiding Face against the Side Ring and Confining Face of the Cup-joint. As a result, the Fortifiers of the two Bushings are forced and squeezed by each other. When the Cup-joint is screwed further to the Bridging Connector, the Fortifiers are responsively deformed to fill up all the gaps in between the metal pipe and the Fortifier Ring. Subsequently, the Fortifier Combination not only clasps the pipe but also seals up the leakage. In practice, since the screwing force is effectively conducted by the Confining Face of the Cup joint to the whole indentation combination, it requires only a few turns of the Cup-joint to seal up the leakage.
Summarily, the invention has achieved the following innovation:
1. The Padding Bushing features a Fortifier structure to match with the Fortifier structure of the Packing Bushing.
2. The Fortifier combination of the two Bushings copes intimately with the metal pipe to perform a double-sealing function.
3. The Fortifier combination of the two Bushings requires less force to produce higher sealing efficiency.
REFERENCES:
patent: 5378027 (1995-01-01), Gehring
patent: 5405172 (1995-04-01), Mullen
patent: 5496076 (1996-03-01), Lin
patent: 1335121 (1963-07-01), None
Jacobson Price Holman & Stern PLLC
Luu Teri Pham
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