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Hand-held cable cutter

  • US 4,369,576 A
  • Filed: 05/22/1981
  • Issued: 01/25/1983
  • Est. Priority Date: 05/22/1981
  • Status: Expired due to Term
First Claim
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1. A hand-held fluid-drive cable-cutter tool comprising:

  • a. a pair of cutter jaws one of which is pivotally fixed and the other of which is pivotally movable;

    b. a manifold having fluid passageways and input and return ports;

    c. fixed means connecting said fixed jaw pivotally to said manifold;

    d. a piston rod having fluid ducts therein;

    e. fixed means securing one end of said piston rod to said manifold;

    f. a piston head on the other end of said piston rod;

    g. a piston cylinder concentric with and movable axially relative to said piston rod;

    h. means connecting said cylinder pivotally to said movable cutter jaw;

    i. a control handle;

    j. support means supporting said control handle from said manifold;

    k. a trigger;

    l. spring means biasing said trigger to a position eccentric with respect to said control handle, said trigger being movable manually from said eccentric position to a position concentric with said control handle;

    m. a drive spool coaxially disposed within said control handle, said spool extending through said trigger and projecting therebeyond;

    n. means connecting said spool to said control handle;

    o. means connecting said spool to said trigger;

    p. a disc valve element having fluid ports and fluid slots;

    q. a valve housing supporting said valve element for rotational movement, the projecting end of said spool being connected to said valve element so that rotational movement of said control handle provides corresponding rotational movement of said valve element;

    r. fluid feed lines extending from a source of pressurized fluid to said input and return ports in said manifold;

    s. a first of said fluid ducts in said piston rod extending from said one end of said piston rod to the other end of said piston rod beyond said piston head;

    t. a second of said fluid ducts in said piston rod extending from said one end of said piston rod to a side surface of said piston rod before said piston head;

    u. said fluid passageways in said manifold extending from said first and second fluid ducts in said piston rod to first and second ports in said disc valve element;

    v. said slots in said valve element providing direct communication from said manifold input port to said return port when said valve element is in the OFF position;

    w. said slots in said valve element providing communication between said manifold input and return ports and said manifold passageways when said valve element is in either of two drive positions.

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