Scissors type steel shearing apparatus with vertically displaced and angularly tilted shearing zones and transversely displaced interlocking portions

A scissors type steel shearing apparatus comprising:

• an upper jaw and a lower jaw;
• at least first, second and third upper shearing blades on said upper jaw;
• at least first second and third lower shearing blades on said lower jaw;
• said shearing blades on said upper jaw interengaging, scissors-wise, with corresponding blades on said lower jaw;
• said first upper shearing blade being disposed a first distance above a reference line;
• said first upper shearing blade having a first tilt angle with respect to said reference line;
• said second upper shearing blade being disposed a second distance above said reference line;
• said second upper shearing blade having a second tilt angle with respect to said reference line;
• said third upper shearing blade being disposed a third distance above said reference line;
• said third upper shearing blade having a third tilt angle with respect to said reference line;
• said first, second and third lower shearing blades being disposed at mirror image positions relative to said first, second and third upper shearing blades, on an opposite side of said reference line;
• said first and second distances and said first and second tilt angles defining a first step in a direction away from said reference line between respectively, a rear end of a shearing edge and a forward end of a shearing edge of the respective ones of adjacent ends of said first and second upper shearing blades;
• said second and third distances and said second and third tilt angles defining a second step in a direction away from said reference line between respectively, a rear end of a shearing edge and a forward end of a shearing edge of the respective ones of adjacent ends of said second and third upper shearing blades;
• and
• said first and second steps being positioned and directed to relieve required shearing forces at first and second predetermined portions of a shearing cycle.

A steel shearing machine comprising:

• an upper jaw;
• a lower jaw,
• at least first and second shearing blades on said upper jaw;
• at least third and fourth shearing blades on said lower jaw, interoperable with said first and second shearing blades;
• each of said first, second, third and fourth blades including first, second, third and fourth corners;
• and
• means for removably mounting said first, second, third and fourth shearing blades on their respective jaws
• with selected ones of said first, second, third and fourth corners positioned as a shearing edge, said first, second, third and fourth shearing blades and the first, second, third and fourth corners thereof being substantially identical whereby any one of said first, second, third and fourth shearing blades can be interchangeable with any other of said first, second, third and fourth shearing blades.

A steel shearing machine comprising:

• an upper jaw;
• a lower jaw;
• at least first and second longitudinally oriented shearing blades on said upper jaw;
• said first and second shearing blades being oriented such as to provide a first step between adjacent ends of said first and second shearing blades defined by one of said adjacent ends having a location which is offset relative to a location of a other of the adjacent ends;
• a first longitudinal clearance between said adjacent ends of said first and second shearing blades;
• at least third and fourth longitudinally oriented shearing blades on said lower jaw, interoperable with said first and second shearing blades, there being a second longitudinal clearance between adjacent ends of said third and fourth shearing blades;
• said third and fourth shearing blades being oriented such as to produce a second step between said adjacent ends of said third and fourth shearing blades defined by one of said third and fourth shearing blades adjacent ends having a location which is offset relative to a location of a other of said third and fourth shearing blade adjacent ends;
• and
• said first and second longitudinal clearances being generally aligned with each other.