Passing person counting apparatus
US4278878A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A passing person counting apparatus, installed at a path (passageway) having a width allowing one person to pass through, for counting the number of persons who pass there in a various different mode or posture, automatically and exactly. It is provided with a trunk portion sensing section with at least a pair of photo-switches, installed at a height of the trunk portion of a human body with an inter-distance slightly narrower than the thickness of the trunk portion, and a leg portion sensing section with at least a pair of photo-switches, installed beneath the former and very closely to each other. The apparatus is constructed such that it counts up one person when at least the under-mentioned three conditions have been fulfilled: (1) all of the photo-switches of the trunk portion sensing section are simultaneously interrupted at least once; (2) the photo-switches of the leg portion sensing section are interrupted while at least one of the photo-switches of the trunk portion sensing section is being interrupted; and (3) the leg which has interrupted the photo-switches of the leg portion sensing section advances in the passing direction without making a turning back.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.