Pushbutton lock
US4936894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1989 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Aug 21, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7322
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A lock includes a plurality of elongated buttons, each of which has on the sides thereof a plurality of gates spaced angularly and longitudinally from one another. A case contains the lock and defines a plurality of bores within which the buttons travel. The buttons are urged out a front cover of the case by biasing springs and are normally prevented from rotation by engagement with keying protrusions on the case. The lock includes a locking bolt which is coupled to a checker plate. The checker plate defines a plurality of edges that engage the sides of the buttons and are received in the gates therein only if the buttons are properly positioned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.