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Continuous rotation hydraulic grapple

  • US 4,426,110 A
  • Filed: 09/17/1981
  • Issued: 01/17/1984
  • Est. Priority Date: 09/17/1981
  • Status: Expired due to Fees
First Claim
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1. A grapple assembly including an upper head connector for support from a crane boom, a depending head, journal means supporting said head from said head connector for reversible continuous rotation relative thereto about an upstanding axis, a rotator (motor) including an upper portion supported from said head connector and a lower rotatable portion supported from said upper portion for reversible continuous rotation relative thereto about an axis at least substantially coinciding with the first mentioned axis, connector means establishing a driving connection between said lower portion and a lower level portion of said head for rotary drive of the latter by said rotator independent of support of any appreciable downward loading of the weight of said head or a load supported therefrom on said rotator lower portion, grapple jaws means pivotally supported from said head for selective angular displacement relative thereto, reversible hydraulic motor means operatively connected between said head and said grapple jaw means for oscillating the latter relative to said head, said upper and lower portions of said rotator including means defining relatively rotatable fluid coupling means including at least two ports on said upper rotator portion in constant fluid communication with a pair of fluid ports on said lower rotator portion throughout rotation of the lower rotator portion relative to the upper rotator portion, and means defining fluid pressure passages communicating said lower rotator fluid ports with said reversible motor means.

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