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Telescoping spring probe

  • US 5,641,315 A
  • Filed: 11/16/1995
  • Issued: 06/24/1997
  • Est. Priority Date: 11/16/1995
  • Status: Expired due to Term
First Claim
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1. An electrical contact spring probe comprising:

  • a barrel having a hollow body with a passageway extending from a closed barrel end to a open barrel end, wherein the open barrel end is crimped radially inward;

    a plunger axially disposed within the barrel passageway, wherein the plunger has a hollow body with a cavity extending from an open plunger end to a closed plunger end, wherein the open plunger end is oriented within the barrel passageway facing the closed barrel end, and wherein the plunger body has an outside surface portion with a diameter greater than the crimped barrel open end to prevent the plunger from exiting the barrel;

    a spring disposed axially within the barrel passageway and the plunger cavity, wherein the closed plunger end has a tip that extends outwardly from the barrel passageway, and wherein the spring is positioned, in the cavity between the barrel closed end the plunger closed end; and

    means disposed within the plunger cavity for imposing a sufficient radially directed force onto the spring to bias a sidewall portion of the plunger body against the barrel passageway for enhancing mechanical contact therebetween during axial travel of the plunger in the barrel against the bias of the spring, said enhanced mechanical contact producing continuity of electrical conduction between the plunger and barrel during said axial travel.

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