Plastic door lock
US4169618A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Oct 2, 1979 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/59
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A plastic door lock, sometimes referred to as a door latch, makes use of moldable plastic material for most of the individual parts of the lock assembly with opposite roses adapted to interlock with each other and be held together with a single screw on the axial center line of the knobs and accessible from the outside. When used as a privacy lock unlocking the lock from the outside is prevented by pushing the inside knob into a releasable but non-rotatable engagement with the inside rose. A lost motion connection between the latch bolt and roll back spindle allows the door to be closed without damage to the latch bolt when the inside knob is locked. Inherent resiliency in the material of the latch bolt case, in cooperation with the movable latch bolt, releasably returns and holds the latch bolt in extended position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.