Hydraulic joint structure

Details Hydraulic joint structure Hydraulic joint structure

2005-02-08

2005-02-08

Bochna, David (Department: 3679)

Pipe joints or couplings

With leakage or drip disposal

C285S355000

Reexamination Certificate

active

06851720

ABSTRACT:
In a hydraulic joint structure for joining respective tubular joint portions of two members, opposed pressure-contact surfaces of the two members for preventing loosening form a downstream space on the downstream side of a seal member. A passage is formed on the pressure-contact surfaces in such a manner that when working fluid leaks from the upstream side of the seal member to the downstream space via a clearance between the seal member and the tubular joint portions, the passage permits the working fluid to flow from the downstream space to an external space in the state in which the pressure-contact surfaces are in pressure contact. The passage is formed in such a manner that the passage extends in a circumferential direction of the thread portions, and communicates at one end with the downstream space and at the other end with the external space.

REFERENCES:
patent: 1756045 (1930-04-01), Wilhelmi
patent: 2104799 (1938-01-01), Evans
patent: 2823699 (1958-02-01), Willis
patent: 3288494 (1966-11-01), Callahan, Jr. et al.
patent: 3822902 (1974-07-01), Maurer et al.
patent: 4489963 (1984-12-01), Raulins et al.
patent: 4807945 (1989-02-01), Budecker et al.

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