Hydraulic jar

  • US 6,290,004 B1
  • Filed: 09/02/1999
  • Issued: 09/18/2001
  • Est. Priority Date: 09/02/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A jar, comprising:

  • a mandrel;

    a housing telescopically positioned about the mandrel;

    a piston positioned between the mandrel and the housing and closing a substantially sealed chamber in the housing, the piston having a first flow passage and a second flow passage for enabling selective flow of a fluid into and out of the substantially sealed chamber;

    a collet positioned in the housing for selectively engaging the mandrel; and

    a sleeve positioned around and being axially moveable relative to the collet, the sleeve having a reduced inner diameter portion at which the collet selectively expands radially to disengage the mandrel.

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