Electronic tape rule
US4896280A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1987 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Nov 19, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/303
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic tape rule comprising a housing (6), a tape (1) that may be extended from the housing and which carries a position track (3, 4) therealong, a reading system (30, 31) in the housing past which the position track travels during movement of the tape, a first processor (10) electrically connected to the reading system for receiving electrical signals therefrom and generating an output indicating the extent of extension of the tape, and a visual display (23) indicative of the extent of tape extension. A second processor (12) is electrically connected to the visual display and to the first processor. A key pad 21 specifies a choice of alternative preprogrammed calculations, the second processor being operative in a first operative state to pass a signal indicating the extent of real tape extension to the visual display and responsive to the key pad to operate in a second operative state in which subsequent signals indicative of the extent of current tape extensions are processed using an earlier extension value stored in memory and the processed result is passed to the visual display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.