Safety attachments for ladders
US4995476A · kind A · utility
19Cited by
7References
9Claims
0Family size
Inventor
Key dates
| Filing date | May 21, 1990 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | May 21, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C1/34
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety attachment for a ladder is disclosed as including an extruded channel fixed to the top of the ladder with a screw shaft having left and right hand threads disposed in the channel, pole engaging arms extend from guides mounted on the shaft threads for movement of the arm to engage and disengage relative to the pole. A pulley fixed to the shaft rotates the same by means of a rope having ends extending toward the bottom of the ladder whereby the pulley may be operated either at the top or the bottom of the ladder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.