Automatic ratchet block
US5511447A · kind A · utility
14Cited by
16References
1Claims
0Family size
Inventors
Key dates
| Filing date | Mar 18, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Mar 18, 2014 |
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, movable sheave assembly, ratchet 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.