Browse Prior Art Database

Rotary Limit Switch

IP.com Disclosure Number: IPCOM000076413D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Rabstejnek, CV: AUTHOR

Abstract

Direct coupling of the rotary member to stationary contact rods is achieved in this switch to indicate shaft rotation. The rotation is directly indicated without the need for any intervening mechanical device for converting the rotary motion.

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Rotary Limit Switch

Direct coupling of the rotary member to stationary contact rods is achieved in this switch to indicate shaft rotation. The rotation is directly indicated without the need for any intervening mechanical device for converting the rotary motion.

The switch is formed of a housing having a sleeve 1 and insulating end plates 2 and 3. A rotatable shaft 4 is mounted in bearing members 5 and 6 contained in the respective end plates. Each end plate 2, 3 is provided with a plurality of holes 7 for receiving contact rods 8 and 9. Rods 8, 9 may be placed at specific positions in the various holes around the end plates. A multiple number of rods are employed to indicate more than one position.

Contactors 10, 11 are affixed to shaft 4. Mounting of the contactors to shaft 4 is accomplished by machining flats in the shaft. Alternatively, slots may be formed in the shaft for receiving the contactors or attachment to the shaft made by brackets.

As the shaft rotates, contactors 10 and 11 complete a direct electrical circuit by wiping contact rods 8 and 9. The rotating motion of the shaft is directly indicated by the measurement made from contact rods 8 and 9. As an example, the arrangement directly indicates the opening and closing of a shutter with the contact rods spaced by 120 degrees.

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