Brake/clutch device for manual hoist
US9994433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2016 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Sep 5, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66D2700/023
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A brake/clutch device for a manual hoist provides an externally-viewable indicator showing the wear status of friction elements within the hoist. The brake/clutch device has a brake block, a brake ratchet, a reversing ratchet, a torsion spring block, a hand wheel and a fastener mounted onto a main shaft of the manual hoist. Friction elements on the brake ratchet provide braking against sudden drops of a load. Ball and spring devices mounted in the hand wheel contact detents and grooves that gradually increase in depth in the torsion spring block depending on the relative positions of the hand wheel and the torsion spring block. The hand wheel has an indicator mark that may align with indicator areas of the torsion spring block to indicate an extent of wear of the friction elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.