Key-changeable lock core
US4386510A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1981 |
| Grant date | Jun 7, 1983 |
| Priority date | — |
| Expiry date | Mar 2, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7672
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A key-changeable lock core of FIG. 8 cross section has a core body with key plug and pin tumbler housings, and a key plug supported for rotation in the key plug housing. A control element, desirably a sleeve about the key plug having a thick top segment carrying a core-retaining lug, is mounted in a core-body recess for rotation between a core-locking position and a lug-retracted position. Its inner face defines an operating shear line at the surface of the key plug, and its outer face defines a control shear line at the top face of the recess, which is preferably a flat planar face. The outer face of the control element has an arcuate portion in the vicinity of the pin tumbler barrels on a radius of curvature about the axis of the control element, and has a planar face portion extending toward the retaining lug in diverging relation with such curvature, preferably tangentially therefrom. Such planar face moves against a lateral portion of the top face of the recess as a stop to stop the control element in its lug-retracted position, and the outward divergence of the planar face provides that the lug and its supporting structure extend radially beyond the radius of curvature of the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.