# US 4,398,191 A · Door interlock system for radioactive testing

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- Number: US 4,398,191 A
- Document ID: US4398191A
- Status: Granted
- Kind: A
- Application number: 06/283,247
- Filed: 1981-07-14
- Granted: 1983-08-09
- Earliest claimed: 1981-07-14
- Assignees: Mobil Oil Corporation
- Inventors: Victor L. Schoepf
- Web page: https://patentgrep.com/patent/US4398191A

## CPC

- G08B 13/08: by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

## Abstract

An interlock system is provided wherein access to a test area containing radioactive material is prevented when testing is initiated and generation of harmful rays is prevented when access to the test area is gained during tests.

## Claims

### Claim 1

An interlock system for a test area having an access door, test equipment contained therein, and means for supplying power to the test equipment, said system comprising:
first switch means for connecting the test equipment to the means for supplying power;
indicator means for determining whether the access door is open;
first disabling means responsive to said indicator means for disconnecting the test equipment from the means for supplying power whenever the access door is open or whenever the access door is opened and closed after said first switch means is closed;
alarm means responsive to said first switch means for providing an indication when the means for supplying power is connected to the test equipment;
generator means for supplying activating pulses to the test equipment; and
disabling means responsive to said generator means for disconnecting the means for supplying power from the test equipment whenever said activating pulses are absent.

### Claim 2 (depends on 1)

The interlock system according to claim 1 also including reset means for reinitiating said generating means.

### Claim 3 (depends on 1)

The interlock system according to claim 1 also including second switch means having a normally closed position wherein said generator means is enabled and an open position wherein said generator means is disabled.