Barrier module lifting clamp
First Claim
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1. A device for lifting and placing concrete barrier modules of the type having a T-shaped upper section, comprising:
- a generally rectangular top plate having a width substantially equal to the width of the top of a barrier module;
a pair of jaw members hingeably attached to said plate and hanging downwardly therefrom, one at each side thereof, each of said jaw members having a generally rectangular jaw face with an inwardly turned lifting surface opposite its hinged side, the height of each said jaw face being slightly greater than is the thickness of the T-shaped upper section of said module, and each said lifting surface adapted to contact the underside of said T-shaped upper module section; and
means to apply a lifting force to said device through said plate and jaw members, said means including a hoist bar aligned perpendicularly to said plate and arranged to accept said lifting force and to be movable between two positions, the first said position causing a closing force to be exerted on said jaw members at all times that a lifting force is applied to said hoist bar, and the second said position causing an opening force to be exerted on said jaw members at all times that a lifting force is applied to said hoist bar.
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Abstract
Concrete barrier modules of the type having a T-shaped upper section are loaded and positioned without damage through use of a clamp device having a pair of jaw members hinged from a horizontal plate. Each jaw member has an inwardly directed lifting surface arranged to press upon an under surface of the module upper section. A hoist bar interacts with a latch to secure the jaw members either in an open or a closed position so long as a lifting force is applied to the hoist bar.
16 Citations
15 Claims
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1. A device for lifting and placing concrete barrier modules of the type having a T-shaped upper section, comprising:
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a generally rectangular top plate having a width substantially equal to the width of the top of a barrier module; a pair of jaw members hingeably attached to said plate and hanging downwardly therefrom, one at each side thereof, each of said jaw members having a generally rectangular jaw face with an inwardly turned lifting surface opposite its hinged side, the height of each said jaw face being slightly greater than is the thickness of the T-shaped upper section of said module, and each said lifting surface adapted to contact the underside of said T-shaped upper module section; and means to apply a lifting force to said device through said plate and jaw members, said means including a hoist bar aligned perpendicularly to said plate and arranged to accept said lifting force and to be movable between two positions, the first said position causing a closing force to be exerted on said jaw members at all times that a lifting force is applied to said hoist bar, and the second said position causing an opening force to be exerted on said jaw members at all times that a lifting force is applied to said hoist bar. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for lifting and placing concrete barrier modules, comprising:
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providing a T-shaped upper section to said modules, said upper section having a flat, horizontally disposed undersurface; aligning a pair of modules end-to-end and spacing said modules apart a short distance; providing a clamp device, said device including a top plate having a width substantially equal to the width of said upper module section, and a length substantially equal to the combined length of said module pair;
said device having a pair of jaw members hingeably attached, one to each side of said plate, and hanging downwardly therefrom, each of said jaw members having a generally rectangular jaw face with an inwardly turned lifting surface opposite said hinged side, the height of each jaw face being slightly greater than the thickness of said upper module section, and each lifting surface adapted to press upon said module undersurface;
said device further having a hoist bar aligned perpendicularly to the plane of said top plate and arranged to move vertically through an opening in the center of said top plate and through a latching means, said latching means arranged to secure the hoist bar in either a first position wherein a closing force is exerted on said jaw members at all times that a lifting force is applied to said hoist bar, or a second position wherein an opening force is exerted on said jaw members at all times that a lifting force is applied to the hoist bar;lowering said clamp device with the hoist bar secured in said second position over a pair of modules until said top plate rests on the modules; causing said latching means to move to the first said position; and hoisting said modules by supplying a lifting force to the hoist bar.
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Specification