Automatic deadbolt
US5820177A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 1, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | May 1, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/558
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mortise lock assembly is provided for mounting in a door opposite a strike plate on a door jamb. The assembly includes an automatic deadbolt feature with a bolt retractor arm that directly contacts and applies inward retraction pressure to a latch bolt and a deadbolt in response to bolt retractor hub rotation to retract the latch bolt and the deadbolt. Two deadbolt stops engage two housing stops when the deadbolt reaches the deadbolt extended position and restrain the deadbolt against further outward movement. Coil extension springs continuously bias the deadbolt and the latch bolt against retraction. A dead lock blocker releasably holds the deadbolt in the deadbolt extended position. The bolt retractor arm is additionally engageable with the blocker to release the blocker in response to bolt retractor hub rotation. A trigger releasably engages and retains the deadbolt in the deadbolt retracted position. The trigger releases the deadbolt when the door closes and the door jamb drives a bolt portion of the trigger inward. Forming the trigger bolt from a low-friction plastic such as DUPONT DELRIN.RTM. minimizes door closing forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.