Key construction
US4312200A · kind A · utility
Inventor
Key dates
| Filing date | Jan 17, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Jan 17, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/8676
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A key construction comprising a pair of key shanks joined at one end to provide a unitary body portion having aligned, oppositely extending key bits each of which is adapted for use in a different lock tumbler. In one of its forms, the key shanks are secured in end-to-end relation by means of a sleeve. The sleeve desirably is provided with a pin to which an end of a key bit receiving and holding member is attached. The key bit receiving and holding member advantageously is constructed in a manner to enable only one of the key bits to be pivoted from a normally, inoperable position in the receiving and holding member to an operable, lock tumbler engaging position. Thus, one key bit can be easily and readily distinguished from the other key bit, and there can be no mistake as to which key bit is to be engaged in which lock tumbler. In another of its forms, one of the key bits is provided with a groove or depression which desirably is engaged by a ridge or rib formed on the inner wall of a key bit receiving and holding member which is separable from the joined key shanks. This arrangement likewise enables one key bit to be easily and readily distinguished from the other key bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.