with screw, worm, or the like, not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure

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Patents Grantslast 30 patents

Information Patent Grant
3706441
- Patent number 3,706,441
- Issue date Dec 19, 1972
- E21 - EARTH DRILLING MINING
Information Patent Grant
2771264
- Patent number 2,771,264
- Issue date Nov 20, 1956
- E21 - EARTH DRILLING MINING
Information Patent Grant
2747829
- Patent number 2,747,829
- Issue date May 29, 1956
- E21 - EARTH DRILLING MINING
Information Patent Grant
1795548
- Patent number 1,795,548
- Issue date Mar 10, 1931
- B66 - HOISTING LIFTING HAULING