Shearing device

Claim 2

A shearing device comprising a. a pair of jaw members at least one of which has an elongate cutting edge, b. means mounting said members for relative movement between an open position defining a jaw to receive an object to be sheared and a closed position in which said members are moved together to close said jaw and shear said object, c. said cutting edge being formed with a first taper such that the thickness of said edge decreases along its length in the direction from a first point thereon to a second point thereon, and with a second taper such that the thickness of said edge decreases along its length in the direction from a third point thereon to said second point, said last-mentioned direction being opposite to the direction from the first to the second point whereby during closing movement of the jaw members to exerted forces are exerted on the object tending to center the same in the vicinity of said second point.

Claim 3

A shearing device according to claim 1, wherein each jaw member is formed with a cutting edge and each of said cutting edges is formed with both said tapers, said tapers on each edge extending from respective said first and third points towards a said second point, the second points of the two edges being substantially coincident with each other in the longitudinal direction of the edges in the closed position of the jaw members.

Claim 4

A shearing device according to claim 2, wherein said jaw members comprise a pair of coplanar blades, each blade being provided with a shallow depression on one face thereof, said depressions in the closed position of the jaw together defining a shallow concavity having a circular outline described about said coincident second points whereby said blades taper radially inwardly towards said second points.

Claim 5

A shearing device according to claim 3, wherein said concavity is formed on both faces of the blade pair.

Claim 6

A shearing device according to claim 1, wherein said mounting means comprise means for pivotally interconnecting the jaw members for movement between said open and closed positions.

Claim 7

A shearing device comprising: a. a frame member, b. a blade member, c. means pivotally mounting said blade member on said frame member for relative movement therebetween from an open position defining a jaw to receive an object to be sheared and a closed position in which said blade and frame are moved relatively together to close said jaw and shear said object, d. power means operatively associated with said blade to move said jaw between said open and said closed position, e. said blade member having an elongate cutting edge formed with a first taper such that the thickness of said edge decreases along its length in the direction from a first point thereon to a second point thereon, and with a second taper such that the thickness of said edge decreases along its length in the direction from a third point thereon to said second point, said last-mentioned direction being opposite to the direction from the first to the second point whereby during closing movement of the jaw forces are exerted on the object tending to center the same in the vicinity of said second point.

Claim 8

A shearing device comprising: a. a frame member, b. a blade member, c. means pivotally mounting said blade member on said frame member for relative movement therebetween from an open position defining a jaw to receive an object to be sheared and a closed position in which said blade and frame are moved relatively together to close said jaw and shear said object, d. power means operatively associated with said blade to move said jaw between said open and said closed position, e. said blade member having an elongate cutting edge formed with a first taper such that the thickness of said edge decreases along its length in the direction from a first point thereon to a second point thereon, and with a second taper such that the thickness of said edge decreases along its length in the direction from a third point thereon to said second point, said last-mentioned direction being opposite to the direction from the first to the second point whereby during closing movement of the jaw forces are exerted on the object tending to center the same in the vicinity of said second point.

Claim 9

A shear mechanism comprising: a. a frame, b. a blade member having a generally concave depression in one surface thereof and a taper along one portion of the concave surface terminating in a cutting edge, c. means for pivotally mounting the blade member on said frame for relative moveMent therebetween from an open position defining a jaw to receive an object to be sheared and a closed position in which said blade and frame are moved relatively together to close said jaw and shear said object, and d. power means operatively associated with said blade to move said jaw between said open and said closed position.

Claim 10

A shear mechanism comprising: a. a frame, b. a blade member having a generally concave depression in one surface thereof and a taper along one portion of the concave surface terminating in a cutting edge, c. means for pivotally mounting the blade member on said frame for relative moveMent therebetween from an open position defining a jaw to receive an object to be sheared and a closed position in which said blade and frame are moved relatively together to close said jaw and shear said object, and d. power means operatively associated with said blade to move said jaw between said open and said closed position.

Claim 11

A shear mechanism comprising: a. a frame, b. a blade member having a generally concave depression in both opposite surfaces thereof to form tapers along one portion of the concave surfaces terminating in a cutting edge, c. means for pivotally mounting the blade member on said frame for relative movement therebetween from an open position defining a jaw to receive an object to be sheared and a closed position in which said blade and frame are moved relatively together to close said jaw and shear said object, and d. power means operatively associated with said blade to move said jaw between said open and said closed position.

Claim 12

A shear mechanism comprising: a. a frame, b. a blade member having a generally concave depression in both opposite surfaces thereof to form tapers along one portion of the concave surfaces terminating in a cutting edge, c. means for pivotally mounting the blade member on said frame for relative movement therebetween from an open position defining a jaw to receive an object to be sheared and a closed position in which said blade and frame are moved relatively together to close said jaw and shear said object, and d. power means operatively associated with said blade to move said jaw between said open and said closed position.