Stepped lowering device and stepped lifter device
US8800947B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2012 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Oct 26, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1556
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A stepped lowering device includes a lifting/lowering link having a pivot on a base and on an ascending/descending body; a toothed link pivoted on the base or the ascending/descending body, includes a link ratchet and swings in association with the lifting/lowering link; an input member, supported by the ascending/descending body or the base; a first lowering prevention latch mechanism engaged with the link ratchet to prevent the toothed link swinging downward when the input member is in a neutral position and allows the toothed link to swing downward when the input member is swung in a lowering direction; and a second lowering prevention latch mechanism which allows the toothed link to swing downward by one tooth of the link ratchet and which is engaged with the link ratchet to prevent the toothed link further swinging downward.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.