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Stop for crane boom

  • US 4,270,663 A
  • Filed: 11/14/1979
  • Issued: 06/02/1981
  • Est. Priority Date: 10/17/1978
  • Status: Expired due to Term
First Claim
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1. In a crane having a body and having a boom pivotally mounted to the body at a first location for swinging movement in a vertical plane, and further havingboom stop mechanism connected between the body and boom to arrest further swinging movement of said boom when it reaches an upper extreme position, the improvement therein comprising:

  • a first rigid member defining an elongated sleeve open at both ends, said sleeve having a pivot connection fixed thereto adjacent one open end thereof and disposed in laterally spaced relation to said sleeve open end thereat whereby said open end is unobstructed by said pivot connection,a second rigid member defining an elongated rod slidably received in said sleeve and extending outwardly from the other open end of said sleeve to terminate in a pivot connection, said rod having a length greater than said sleeve so as to be enabled to slide therein to entend outwardly from said one sleeve end,a pivotal mounting on said body at a second location spaced from said first location and having a horizontal pivot axis fixed with respect to said body,a pivotal mounting on said boom having a horizontal pivot axis fixed with respect to said boom,a pivot pin interconnecting said body pivotal mounting and the pivot connection on one of said members for swinging movement of said member about said body fixed axis,a pivot pin interconnecting said boom pivotal mounting and the pivot connection on the other of said members for swinging movement of said member about said body fixed axis, said rigid members constituting the sole interconnection between said pivotal mounting, and,a stop unit rigidly affixed to said body in a predetermined position thereon,said stop unit having an elongated receiving means, abutment means disposed in said receiving means and mounted for axial movement therein, and cushion means interconnecting said receiving means and said abutment means,said stop means being mounted in spaced relation to said one end of said sleeve to permit said sleeve to pivot relative thereto as said boom swings, said abutment means being axially aligned with said sleeve when said boom reaches an upper extreme position thereby to receive said rod sliding outwardly from said one open sleeve end into abutting relation with said abutment means.

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