Thread protector wrench

Details Thread protector wrench Thread protector wrench

1982-04-14

1984-04-17

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 1500

Patent

active

044427379

ABSTRACT:
Removal of a screw-on type of thread protector from a pipe is achieved by this invention with uniformly applied pressure about the entire circumferential surface of the thread protector. Thus an inflatable type grasping urethane boot of a wrench mechanism is positioned circumferentially about and adjacent to the grasping surface of a generally cylindrical screwed-on thread protector before inflation. The boot is connected with a chamber which retains a fluid such as air under pressure and thus is firmly coupled in grasping connection with the thread protector by inflating in place from an air pressure hose for example. After removal of the thread protector, the chamber may be deflated to release it. The wrench is manipulated to rotate the inflated boot by rotation of a shaft co-axially located with the pipe to which the inflation valve may be attached for ready access. Preferably, the boot is supplied with a tread design to give better grasping characteristics.

REFERENCES:
patent: 2865640 (1958-12-01), Watson et al.
patent: 3471160 (1969-10-01), Sabo
patent: 3858613 (1975-01-01), Musslewhite
patent: 4036261 (1977-07-01), Hauk et al.
patent: 4173988 (1979-11-01), Fowler

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