Relay contact carrier coated with an antistatic material

• US 4,071,835 A
• Filed: 03/26/1976
• Issued: 01/31/1978
• Est. Priority Date: 03/26/1976
• Status: Expired due to Term

• Current Assignee: Joslyn Clark Controls, Inc. (Fortive Corp.)
• Original Assignee: Clark Control Incorporated
• Inventors: Schneider, Richard, Russo, Roland
• Primary Examiner(s): Harris, George
• Application Number:
  US05/670,837
• Time in Patent Office: 676 Days
• Field of Search: 335/132, 335/133, 335/196, 335/301, 335/6, 200/267, 200/270, 200/275, 200/302
• US Class Current: 335/133
• CPC Class Codes: H01H 50/546 for contactors having bridging contacts

Abstract

An electrical relay having a reciprocally driven contact carrier of insulating material on which movable contacts are mounted. The contact carrier is treated with an antistatic surfactant to provide a coating which prevents the buildup of an electrostatic charge. Since a charge does not build up on the contact carrier and the movable contacts, they do not attract nonconducting contaminating materials which otherwise would collect on the surfaces of the contacts interfering with the making of proper electrical connections.

Claims

1. An electrical circuit making and breaking device including in combination

a supporting member;

a fixed contact mounted in said supporting member;

a movable contact;

a contact carrier of insulating material having the movable contact mounted thereon, said contact carrier being mounted in said supporting member for movement therein between a first position at which said contacts are open and a second position at which said contacts are closed;

an operating mechanism coupled to said contact carrier for moving said contact carrier within said supporting member between said first and second positions to selectively open and close said contacts; and

a coating of an antistatic material on the surface of said contact carrier whereby a charge of static electricity does not build up on the contact carrier or the movable contact.

2. An electrical circuit making and breaking device in accordance with claim 1 wherein

said antistatic material is an antistatic surfactant.

3. An electrical circuit making and breaking device in accordance with claim 1 wherein

said antistatic material is an antistatic cationic surfactant.

4. An electrical circuit making and breaking device in accordance with claim 1 wherein

said antistatic material is a quaternary ammonium sulfate - polyether type surfactant.

5. An electrical circuit making and breaking device including in combination

a supporting member of insulating material;

a fixed contact mounted in said supporting member;

a movable contact;

a contact carrier of insulating material having the movable contact mounted thereon, said contact carrier being mounted in said supporting member for movement therein between a first position at which said contacts are open and a second position at which said contacts are closed; and

an operating mechanism coupled to said contact carrier for moving said contact carrier within said supporting member between said first and second positions to selectively open and close said contacts;

the surface of said contact carrier having been treated with a water solution of a quaternary ammonium sulfate - polyether type surfactant.