Automatic ratchet block
US5319997A · kind A · utility
3Cited by
12References
9Claims
0Family size
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | Jun 14, 1994 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2137
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A ratchet block comprised of a frame, moveable sheave assembly, ratchet assembly and cam wherein the ratchet automatically engages under load permitting rotation of the sheave in only one direction, and disengages when the load is removed permitting rotation in both directions. This automatic engagement and disengagement of the ratchet to increase or reduce friction when a rope or wire is run through the sheave does not require the user to disengage the ratchet mechanism with a conventional switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.