HEAVY DUTY MATERIAL PROCESSING SHEARS
First Claim
1. A method of using a material processing shears, the shears comprising:
- first and second jaws pivotally connected to each other for relative pivotal movement about a jaw axis between open and closed positions, the first jaw having a first cutting blade with a first cutting edge; and
a fluid driven actuator operatively extending between the jaws for selective powered movement of the jaws between their open and closed positions, the method comprising;
positioning the shears such that a work piece is disposed between the first and second jaws; and
cutting the work piece primarily with the first cutting blade such that the cutting of the work piece is predominantly localized at an intersection between the work piece and the first cutting blade, while the lower jaw predominantly supports the work piece without cutting into it.
1 Assignment
0 Petitions
Accused Products
Abstract
A heavy-duty material processing shears includes pivotally connected jaws and a hydraulic cylinder operatively extending between the jaws to open and close the jaws. One of the jaws includes a cutting blade with a substantially convex cutting edge. The cutting blade'"'"'s surfaces intersect at an acute angle to define the cutting edge. The cutting blade'"'"'s shape enables it to efficiently pierce and cut through large diameter structures such as conductor pipes. The other jaw includes a substantially concave portion that cradles the work piece. The shears include various features that facilitate subsea or above-water use of the shears to cut portions of a decommissioned oil platform.
90 Citations
56 Claims
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1. A method of using a material processing shears, the shears comprising:
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first and second jaws pivotally connected to each other for relative pivotal movement about a jaw axis between open and closed positions, the first jaw having a first cutting blade with a first cutting edge; and
a fluid driven actuator operatively extending between the jaws for selective powered movement of the jaws between their open and closed positions, the method comprising;
positioning the shears such that a work piece is disposed between the first and second jaws; and
cutting the work piece primarily with the first cutting blade such that the cutting of the work piece is predominantly localized at an intersection between the work piece and the first cutting blade, while the lower jaw predominantly supports the work piece without cutting into it. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of cutting a conductor pipe having inner and outer metal pipes with grouting disposed between the inner and outer pipes, comprising:
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cradling a first portion of the conductor pipe;
applying hydraulic pressure to move a bulged blade into contact with a second portion of the conductor pipe opposite the first portion;
cutting the second portion of the conductor pipe with the bulged blade, generally without cutting the first portion of the conductor pipe; and
subsequent to cutting the second portion of the conductor pipe, cutting the first portion of the conductor pipe.
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34. A material-processing shears comprising:
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first and second jaws connected to each other for relative pivotal movement about a jaw axis between open and closed positions; and
a hydraulic piston and cylinder operatively extending between the jaws for selective powered movement of the jaws between their open and closed positions, wherein the cylinder has an internal diameter of at least 3 inches, wherein the first jaw has a first cutting blade with a first cutting edge that bulges toward the second jaw, and wherein the second jaw includes a surface facing toward the first jaw when the jaws are in the open position, the surface including a recess that extends away from the first jaw. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A method for creating a shears having first and second relatively movable jaws and first and second primary and secondary blade insert seats in the first and second jaws, respectively, the method comprising:
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mounting a first blade insert member to the first jaw, the first blade insert member having mounting portions that complement the primary and secondary blade insert seats of the first jaw, the first blade insert member having a cutting edge with a convex portion; and
mounting a second blade insert member to the second jaw, the second blade insert member having mounting portions that complement the secondary blade insert seat of the second jaw, the second blade insert member having a raised portion that protrudes from the second jaw toward the first jaw. - View Dependent Claims (53)
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54. A material-processing shears comprising:
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first and second jaws connected to each other for relative pivotal movement about a jaw axis between open and closed positions; and
a hydraulic piston and cylinder operatively extending between the jaws for selective powered movement of the jaws between their open and closed positions, wherein the cylinder has an internal diameter of at least 3 inches, wherein the first jaw has a first blade insert member with a first cutting edge that includes a bulging portion that bulges toward the second jaw, and wherein the second jaw includes a second blade insert member with a raised portion that protrudes toward the first jaw relative to an adjacent portion of the second jaw. - View Dependent Claims (55, 56)
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Specification