Crane crab head
AssigneeNewpark Mats & Integrated Services LLC
InventorHugh Stewart Robertson
Life of this patent
Estimating the term…
Abstract
A crane grab head (100) comprising a pair of jaws (102;104), a power source for moving the jaws, and a connector (116) for connecting the grab head (100) to a crane, wherein each jaw (102;104) comprises at least one tooth (110) for engaging with an object. Each jaw (102;104) is driven by a respective hydraulic/pneumatic cylinder (108a;108b)which is slideable linearly to move the jaws (102;104) between open and closed positions. The width of the grab measured between the extremities of the jaws (102;104) in the closed position is more than 1500 mm. The separation between a horizontal plane passing through the top of the uppermost cylinder (108a;108b) when the head (100) is held freely in normal use and a parallel plane passing through the lowermost edge of the lowermost tooth (110) is less than 250 mm.
Claims22
A crane grab head comprising a pair of jaws, a power source for moving the jaws, and a connector for connecting the grab head to a crane, wherein each jaw comprises at least one tooth for engaging with an object;
- wherein each jaw is driven by a respective hydraulic/pneumatic cylinder which is slideable linearly to move the jaws between open and closed positions;
- wherein the width of the grab measured between the extremities of the jaws in the closed position is more than 1500 mm;
- and
- wherein the separation between a horizontal plane passing through the top of the uppermost cylinder when the head is held freely in normal use and a parallel plane passing through the lowermost edge of the lowermost tooth is less than 250 mm.
A crane grab head comprising a pair of jaws, a power source for moving the jaws, and a connector for connecting the grab head to a crane, wherein each jaw comprises at least one tooth for engaging with an object;
- wherein each jaw is driven by a respective hydraulic/pneumatic cylinder which is slideable linearly to move the jaws between open and closed positions;
- wherein the width of the grab measured between the extremities of the jaws in the closed position is more than 1500 mm;
- and
- wherein the tooth/teeth of the first jaw are spaced further beneath the cylinders when the head is held freely in normal use than are the tooth/teeth of the other jaw.
A crane grab head comprising a pair of jaws, a power source for moving the jaws, and a connector for connecting the grab head to a crane, wherein each jaw comprises at least one tooth for engaging with an object;
- wherein each jaw is driven by a respective hydraulic/pneumatic cylinder which is slideable linearly to move the jaws between open and closed positions;
- wherein the width of the grab measured between the extremities of the jaws in the closed position is more than 1500 mm;
- and
- wherein the pneumatic/hydraulic cylinders are arranged to pull together and push apart the pairs of jaws with equal force either way.
Dependencies are inferred from the claim text.