Fail-safe cleat with automatic in-line locking cam and quick-release slot
US7234686B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 28, 2004 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Oct 1, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T24/3944
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A failsafe device for raising/lowering articles includes a frame and a fastener for attaching the frame to a ceiling or wall to elevated an article above the floor. A pulley or sheave is mounted on the frame about a substantially horizontal axis when the frame is mounted on the ceiling or wall. A line is entrained over the pulley and has a substantially vertical lifting line portion attachable to the article to the lifted and a substantially vertical pulling line portion arranged to be pulled downwardly by a user to elevate the article and raised upwardly to lower the article. A cam is mounted on the frame on one side of the pulling line portion and has a line engaging surface. The cam is movable between a line releasing position and a line locking position, the line engaging surface including a first engaging portion normally spaced a fixed distance from the pulling line portion to form a clearance gap in the line releasing position and a second engaging portion bridging the clearance gap a distance equal to least the fixed distance for substantially instantaneously arresting the line and preventing movement of the pulling line portion upwardly toward the pulley and corresponding …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.