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Reed Switch

IP.com Disclosure Number: IPCOM000097270D
Original Publication Date: 1962-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Soychak, FJ: AUTHOR

Abstract

This reed switch has two generally parallel reeds 1 and 2. These are formed of magnetic material and constitute part of an electrical circuit, not shown. The ends of these reeds project into glass tube 3 and overlap. The tube is sealed at its ends to provide a cantilever support for the reeds at a point back from their overlying ends. Upon energization of coil 4, a magnetic field effects attraction and contact of the reeds to complete a circuit.

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Reed Switch

This reed switch has two generally parallel reeds 1 and 2. These are formed of magnetic material and constitute part of an electrical circuit, not shown. The ends of these reeds project into glass tube 3 and overlap. The tube is sealed at its ends to provide a cantilever support for the reeds at a point back from their overlying ends. Upon energization of coil 4, a magnetic field effects attraction and contact of the reeds to complete a circuit.

The normally spaced overlying ends of the reeds have a curved configuration. These ends are hooked or curved back over each other. Also, the reeds are sufficiently resilient so that, upon energization of coil 4, the electrical circuit should be completed through two parallel arranged contact points x and y. Since these contact points x and y are arranged in parallel, the effective resistance through these when closed is (Rx.Ry) (Rx + Ry). Hence, if either contact x or y is contaminated, such as by magnetic particles or dust trapped within the glass tube, the resistance of the contaminated contact may increase considerably. However, the effective resistance of the parallel arranged contacts x and y is not appreciably modified.

The magnetic flux acts over the entire overlying portions of the reeds extending between the contact points x and y. This reed configuration provides increased wiping action and also reduces contact bounce by dampening reed vibration.

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