Safety system with intermittent photoelectric beam
US6091064A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | Jul 18, 2000 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A safety system for high density mobile storage utilizes a photoelectric transmitter that cyclically emits an intermittent beam at a predetermined frequency into an aisle adjacent a mobile carriage. Two or more transmitters can be arranged in each of one or more clusters on the carriage. The intermittent beams are directed to photoelectric receivers across the aisle. Each receiver sends a signal to reset an associated counter each time the receivers detect an intermittent beam. As long as every receiver detects at least one intermittent beam at the predetermined frequency, the mobile carriage is enabled to move. The receivers can be on the same mobile carriage as the transmitter to protect a vertical plane close and parallel to the front face of the carriage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.