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Piston and cylinder unit

  • US 4,854,218 A
  • Filed: 10/01/1986
  • Issued: 08/08/1989
  • Est. Priority Date: 10/05/1985
  • Status: Expired due to Fees
First Claim
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1. In a piston and cylinder unit having a cylinder body comprising a tube with end caps;

  • a piston mounted for controlled axial displacement in the tube;

    a piston rod extending along part of the tube with a portion of the piston rod mounted to extend through one end cap externally of the body in sealing engagement with the one end cap for axial movement relative thereto with an external end of the portion free for coupling to a power take-off;

    a rack having a toothed portion extending along the portion of the piston rod from a location external of the body through the one end cap into said tube part; and

    , a pinion gear in operative engagement with the toothed portion of the rack throughout the working stroke of the piston rod, piston rod movement control means connected with the pinion gear means to connect a supply of pressure fluid to said part of the tube, the pinion gear being mounted inside the cylinder body with the pinion gear in operative engagement with a toothed portion of the rack inside the cylinder body.

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