Pipe joints or couplings – Elbow
Patent
1976-06-16
1977-11-29
Callaghan, Thomas F.
Pipe joints or couplings
Elbow
285369, 285390, 285417, F16L 1500
Patent
active
040602648
ABSTRACT:
The present invention provides a coupling member for joining two generally coaxial, tubular members such as an electrical conduit. The coupling member includes internal left hand threads at one end and internal right hand threads at the other end with an annular groove therebetween. One end of a first conduit is provided with two sets of axially spaced apart external left hand threads. The coupling member is rotated so that the left hand threads thereof matingly engage the first set of left hand threads on the conduit and then is temporarily locked by engagement of the second set of left hand threads. The first set of left hand threads on the conduit will then be in the annular groove defined between the left and right hand threads of the coupling member. A standard length of a second conduit having external right hand threads thereon may then be matingly engaged with the right hand threads of the coupling member. After a few threads of the second conduit are engaged, the coupling member is disengaged from the second set of left hand threads of the first conduit so that the coupling member is free to rotate relative to the first conduit, whereby the coupling member can be rotated to fully engage the second conduit thereto. If desired, a sealing ring may be placed in the annular groove in the coupling member so that the end faces of the two conduits may bear against the opposed transverse faces of the sealing ring.
REFERENCES:
patent: 278800 (1883-06-01), Kline
patent: 2906152 (1959-09-01), Brase
patent: 2926027 (1960-02-01), Marquis, Jr.
patent: 3461877 (1969-08-01), Morch
patent: 3871692 (1975-03-01), Brownfield
Callaghan Thomas F.
I-T-E Imperial Corporation EFCOR Division
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