Internal gripping pipe wrench

Details Internal gripping pipe wrench Internal gripping pipe wrench

1983-11-25

1985-02-19

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81443, B25B 1500

Patent

active

044997990

ABSTRACT:
A tool for insertion into a pipe in order to apply torque by contact with the inside surface of the pipe. It has an axially located socket in a central rotor with a concentric ring around the rotor. The ring has a plurality of toothed gripping arms pivoted on the ring and connected to the rotor by links pivoted at both ends so that relative rotation of the rotor extends the gripping arms for contacting the inside of the pipe by the teeth.

REFERENCES:
patent: 2482501 (1949-09-01), Oravetz
patent: 2528873 (1950-11-01), Dorman

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