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Browse Prior Art Database

SPRING WASHER POWER CONTACT

IP.com Disclosure Number: IPCOM000006327D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-25
Document File: 1 page(s) / 53K

Publishing Venue

Motorola

Related People

Jeffrey P. Marchuk: AUTHOR [+4]

Abstract

In high tolerance environments, designs are &en required which can absorb some of these tolerances. This is especially true with respect to designs requiring solid electrical contact. In many radio and small appli- ance applications, contacts on the unit are connected to a removable power source (battery). With the advent of engineering plastics, these contacts often protrude through a plastic housing or back cover. However, in such a design there is a risk that the plastic will creep or that the screws holding the contacts will loosen; this can result in inter- mittent operation of the unit.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

SPRING WASHER POWER CONTACT

by Jeffrey I? Marchuk, John Dzung, Faris Habbaba and Steve Finch

  In high tolerance environments, designs are &en required which can absorb some of these tolerances. This is especially true with respect to designs requiring solid electrical contact. In many radio and small appli- ance applications, contacts on the unit are connected to a removable power source (battery). With the advent of engineering plastics, these contacts often protrude through a plastic housing or back cover. However, in such a design there is a risk that the plastic will creep or that the screws holding the contacts will loosen; this can result in inter- mittent operation of the unit.

  Many existing designs make use of a lock washer in addition to the contact; other existing designs incorpo- rate the lock washer feature into the contact itself. How- ever, in both of these instances, the contact is still loaded against plastic.

  In the design in question, the existing concept and parts dictated a bushing with internal threads protrud- ing through a housing bottom. A screw would retain a cantilever contact by sandwiching one end between the bushing and the screw head.

  However, there was also the concern of sealing the contact, as the design requirements stipulated water immersion capability. A standard radial O-ring around the bushing,. sealing in the housing through hole, was chosen for the sealing conc...