×

Crane implement for hoisting and launching boats to and from a quay

  • US 4,973,094 A
  • Filed: 09/19/1989
  • Issued: 11/27/1990
  • Est. Priority Date: 09/27/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for hoisting boats comprising a balance constituted by a steel frame having at least a central longitudinal beam provided with suspension means for rotatably hanging on a hook of a crane and at least two parallel crossbeams fixedly attached to the two extremities, respectively, of said central longitudinal beam, whereineach of said crossbeams is formed by a tubular central member fixedly connected to an extremity of said central longitudinal beam and by two horizontal arms, each horizontal arm being telescopically extensible out of one extremity of said tubular central member and said two arms being extensible and retractable by means of a remotely controlled actuator;

  • a rigid vertical leg, the length of which may be telescopically adjusted, is fixedly connected to the outermost extremity of each of said telescopically extensible horizontal arms of the balance and is provided with a cantilever foot which is also adjustable in length and which carries at an extremity thereof a support plate for the keel of a boat to be hoisted;

    said suspension means for hanging on the hook of a crane essentially comprise a suspension carriage which can be moved along said central longitudinal beam by means of remotely controlled actuating means for changing the point of application of the hoisting pull along the longitudinal axis of the suspended load;

    the balance, with said horizontal arms extended, being lowered on a boat to be hoisted until bringing the level of said feet below the level of the keel of the boat, said horizontal arms being retracted to bring said feet under the keel and said suspension carriage being positioned in coincidence with the center of gravity of the suspended load for hoisting the boat resting on said support plates in a substantially horizontal trim.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×