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Power shovel with dipper door snubber and/or closure assembly

  • US 6,219,946 B1
  • Filed: 08/18/1999
  • Issued: 04/24/2001
  • Est. Priority Date: 08/18/1999
  • Status: Expired due to Fees
First Claim
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1. A power shovel comprising:

  • a frame;

    a dipper handle mounted on said frame for pivotal movement relative thereto about a dipper handle axis;

    a dipper connected to said handle for movement therewith, said dipper having a dipper body defining a material receiving opening and a material discharging opening, said dipper further having a dipper door mounted on said dipper body for pivotal movement relative thereto about a dipper door axis for opening and closing said discharge opening; and

    a hydraulic assembly including a hydraulic cylinder, a piston which is movable within said hydraulic cylinder and which divides said hydraulic cylinder into a first variable volume chamber and a second variable volume chamber, a piston rod attached to said piston, one of said hydraulic cylinder and said piston rod being connected to said dipper body and the other of said hydraulic cylinder and said piston rod being connected to said dipper door, a conduit connecting said first chamber to said second chamber, and a valve for controlling hydraulic fluid flow through said conduit from one of said chambers to the other of said chambers such that when said valve is closed, the hydraulic fluid is substantially prevented from flowing between said chambers so that said dipper door is substantially prevented from pivoting about said dipper door axis, and such that when said valve is opened, the hydraulic fluid is allowed to flow between said chambers such that said dipper door is allowed to pivot about said dipper door axis.

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