Door-opener apparatus
US4342535A · kind A · utility
30Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1980 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Aug 14, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25J9/0093
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus having a pivoted arm mounted on a base for seizing and releasing an article that is hinged at one end and which includes a control link that maintains a fixed length while the arm moves the article about its hinged end between preset positions, but changes its length and thereby provides a signal indicating that the arm has seized the article when the latter is moved in a direction opposite to the normal movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.