| CPC B66C 1/442 (2013.01) | 13 Claims |
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1. A lifting clamp comprising:
a lifting lug connectable to a lifting machine;
a first hoisting arm pivotally connected to and extending away from the lifting lug on a first side of a central plane through the lifting lug, and a second hoisting arm pivotally connected to and extending away from the lifting lug on a second side of the central plane such that the central plane is between the first and second hoisting arms;
a first scissor arm pivotally connected to the first hoisting arm, the first scissor arm extending away from the first hoisting arm to cross through the central plane to the second side of the central plane, and a second scissor arm pivotally connected to the second hoisting arm, the second scissor arm extending away from the second hoisting arm to cross through the central plane to the first side of the central plane;
a cross-brace pivotally connected to the first scissor arm on the second side of the central plane and pivotally connected to the second scissor arm on the first side of the central plane;
a first gripper connected to the first scissor arm, and a second gripper connected to the second scissor arm;
at least two locking clutches and at least two corresponding clutch receivers, the clutch receivers configured to receive the locking clutches and the locking clutches configured to be lockable in the clutch receivers for preventing pivoting of the first and second hoisting arms and the first and second scissor arms when the first and second grippers are in an opened configuration; and,
at least one outrigger mounted on the cross-brace, the at least one outrigger oriented to engage a top of an object to be clamped between the first and second grippers, the at least one outrigger comprising
a shoe for engagement with the top of the object,
an elongated element extending from the shoe,
a mounting plate mounted on the cross-brace, the mounting element comprising an aperture for receiving the elongated element and
a releasable and securable securement element for securing the elongated element in the aperture of the mounting plate and for permitting the elongated element with the shoe to be adjustable vertically in relation to the cross-brace,
wherein lifting the lifting lug causes the first and second hoisting arms to pivot toward each other and toward the central plane, the first and second scissor arms to pivot toward each other and toward the central plane and the first and second grippers to pivot toward each other and toward the central plane to clamp the object disposed between the first and second grippers.
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