# US 5,349,781 A · Simulation-preventing turnstile

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- Number: US 5,349,781 A
- Document ID: US5349781A
- Status: Granted
- Kind: A
- Application number: 08/036,641
- Filed: 1993-03-24
- Granted: 1994-09-27
- Earliest claimed: 1992-03-25
- Assignees: Italdis S.p.A.
- Inventors: Mario Libardi
- Web page: https://patentgrep.com/patent/US5349781A

## CPC

- G07C 9/10: Movable barriers with registering means
- E06B 11/08: Turnstiles; {Gates for control of entry or exit of persons, e.g. in supermarkets} (control gates on vehicles B60N5/00 {; bank protection devices E05G5/00}; with registering means G07C9/10 {; coin-freed facilities for turnstiles G07F17/14})
- G08B 13/10: by pressure on floors, floor coverings, stair treads, counters, or tills
- G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

## Abstract

A turnstile provided with an electronic control unit having a photoelectric cell (8, 9) connected therewith, located downstream from the turnstile revolving member (3), in the user walking-through direction, in order to check if the user has actually walked through. Therefore, the turnstile has the ability to detect and issue a signal for, a simulated walking-through attempt performed by a user who actuates turnstile revolving member (3) without actually walking-through said turnstile, and it proves particularly effective for checking the arrival and the presence of personnel at the working posts.

## Claims

### Claim 1

A simulation-preventing turnstile having an upstream and a downstream side and comprising:
a housing;
a revolving member extending from the housing between the upstream and downstream sides;
a first optical sensor located at the upstream side of the housing;
a second optical sensor located at the downstream side of the housing;
a third optical sensor located above the revolving member; and
a fourth optical sensor located below the revolving member, each of the first through fourth optical sensors providing a triggering signal to an electronic control unit, the optical sensors being triggered in a predetermined manner when a person correctly passes through the turnstile from the upstream side to the downstream side, the electronic control unit activating an alarm when a deviation from the predetermined manner is detected.

### Claim 2 (depends on 1)

The turnstile of claim 1 wherein the first through fourth optical sensors comprise at least one modulated infrared radiation photoelectric cell.

### Claim 3 (depends on 1)

The turnstile of claim 1 further comprising a pressure sensor positioned on a top portion of the housing, the pressure sensor being sensitive to a person asserting pressure on the top of the housing when attempting to pass over the revolving member, the pressure sensor providing a triggering signal to the electronic control unit, the predetermined manner taking the triggering signal from the pressure sensor into consideration.