Shear construction

Claim 2

A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting means mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first and second blades having straight cutting edges and being in the form of a truncated pyramid.

Claim 3

A shear, according to claim 1, wherein said blades are of substantially the same form and each is provided with a central hole therethrough, said mounting means comprising a bolt extending through the hole to secure said blade in position.

Claim 4

A shear, according to claim 1, wherein said first and second mounting means mount said first and second blades so that their mounting axes are substantially 90* apart.

Claim 5

A shear, according to claim 1, wherein said first and second mounting means and said first and second blades are such that said first and second blades overlap each other in the lower dead center position of movement of said first blade, the overlapping being approximately to the center of said first and second blades.

Claim 6

A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting mrand mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first mounting means comprising a plunger, a frame head guiding said plunger for vertical upward and downward movement, said first blade comprising a truncated pyramid having a bore therethrough, a bolt extending thrOugh the bore of said first blade and holding said first blade to said plunger with said first blade positioned in an upright position, said second mounting means comprising a mounting arm located below said plunger and having an upwardly facing mounting base, said second blade being mounted on said upwardly facing mounting base and being in the form of a truncated pyramid with a bore extending therethrough, a second bolt extending through the bore of said second cutting blade and into said mounting base and holding said second blade in a flat substantially horizontally extending position.

Claim 7

A shear, particularly a portable shear, comprising a first reciprocating blade, a second fixed blade, first mounting means mounting said first blade for reciprocating movement, second mounting mrand mounting said second blade in a fixed position closely alongside the movement path of said first blade for cooperative shearing operation with said first blade, each blade comprising a block-like member having a plurality of separately oriented cutting edges disposed at angles to each other, said first and second mounting means permitting the adjustable positioning of said first and second blades for the orientation of selected cutting edges in operative positions, said first mounting means comprising a plunger, a frame head guiding said plunger for vertical upward and downward movement, said first blade comprising a truncated pyramid having a bore therethrough, a bolt extending thrOugh the bore of said first blade and holding said first blade to said plunger with said first blade positioned in an upright position, said second mounting means comprising a mounting arm located below said plunger and having an upwardly facing mounting base, said second blade being mounted on said upwardly facing mounting base and being in the form of a truncated pyramid with a bore extending therethrough, a second bolt extending through the bore of said second cutting blade and into said mounting base and holding said second blade in a flat substantially horizontally extending position.