Spring/dead bolt lock assembly
US4333324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1980 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Jun 23, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/0993
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
One part of a key-in-knob lock set functions in a normal manner such that when the lock set is unlocked, either the outside or inside knob can be manipulated to open the door by withdrawing the latch bolt from a normal spring latch extended position. When, instead, the lock set is locked, the latch bolt is extended an exceptionally long distance into the frame to a dead bolt position. Extension and retraction of the latch bolt to and from dead bolt position is accomplished by manipulation of a main cam through the agency of a key in the outside or a turn button on the inside. For withdrawing the latch bolt from the normal spring latch extended position, an escutcheon housing for the outside knob or a corresponding escutcheon housing for the inside knob serves, by moving transversely of the axis of rotation of the knob, to rotate a radially extending tooth-like element on the spindle which, acting through the main cam, withdraws the latch bolt. By rotation of the key on the outside, or the turn button on the inside, the spindle is rotated a greater amount, far enough to have the main cam extend the latch bolt an additional distance to the dead bolt position. In that dead bolt positi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.