Joints and connections – Distinct end coupler – Continuous thread
Patent
1979-08-10
1982-01-05
Kundrat, Andrew V.
Joints and connections
Distinct end coupler
Continuous thread
403343, F16B 700
Patent
active
043091229
ABSTRACT:
The present invention pertains to a coupled sectional rod assembly of a type for use in an underground pipe installer device for, first, forming an underground hole between two given points and, second, installing a pipe or the like in the hole. Each end of the rod includes a reduced diameter screw threaded stud portion for reception in one end of a coupler having the same outside diameter as the rod section. Both ends of the coupler conventionally include an unthreaded lead-in end portion. Both screw threaded-end stud portions of each rod section of the present invention include a shoulder portion connecting between the screw threaded studs and the main rod section length. Each shoulder portion is of a diameter substantially equal to the inner diameter of the unthreaded lead-in end portion for engagement therein when the threads are fully engaged in a coupler, for the purpose of supporting the unthreaded end portions against inward crimping under the very substantial radially inwardly directed forces applied to the rod assembly during the hole forming operation.
REFERENCES:
patent: 154444 (1974-08-01), Bauser
patent: 1849066 (1932-03-01), Bridges
patent: 1984026 (1934-12-01), Little
patent: 2834625 (1958-05-01), Stanley et al.
patent: 3495123 (1970-02-01), Raddatz
patent: 3645570 (1972-02-01), Johansson
patent: 3876319 (1975-04-01), Meyer
Kundrat Andrew V.
Wilson Alfred E.
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