Cylindrical lock set
US3955387A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1974 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Nov 14, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/82
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A heavy duty cylindrical lock set adaptable for various "functions" and having improved features, especially to permit a key-removable lock core to be reversible in its knob mounting to suit right- and left-hand doors. A knob sleeve of large diameter is slotted and shaped at its knob receiving end to form two diametrically-opposed channel sections of high strength and rigidity. The inward edges of the four channel side legs form a mounting seat to receive the key-plug-containing body of the core on the axis of the knob, while the two spaces between the channel sections permit the pin-tumbler lobe or section of the core to extend radially in either of two orientations about the axis of the knob. Two of the channel side edges are notched to engage a key-controlled retaining lug of the core. The knob has a large bore in its outer end and is supported from the knob sleeve by a drive ring which accomodates the core in both orientations. A face plate is held in the knob bore by the core and closes the knob bore. The same knob may be used on the inside of the door, with a similar lock core and face plate or with a different face plate, differently retained, according to the "function" for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.