Combination lock
US4881390A · kind A · utility
Inventor
Key dates
| Filing date | Jun 30, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jun 30, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7271
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door handle is mounted on a door by bolts, the handle incorporates a combination lock comprising a shaft, a plurality of discs mounted coaxially on the shaft for individual rotation thereon, each disc having a first internal annual surface formed with a depression. The depression of at least one disc defining an abutment edge, a latch member mounted between the shaft and the annular surface and extending parallel to the shaft biasing means urging the latch member into engagement with the first annular surface, the discs being rotatable on the shaft without turning the shaft, except when all the depressions are aligned with the latch member, so that the latch member in its latched position extending into the depressions rotating in one direction of the disc or discs having an abutment surface causes the abutment surface to engage the latch member and turn the shaft. (FIG. 3)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.