What is claimed is:
1. A perforating punch for forming a rectangular perforation in a workpiece, comprising:
a shank of a rectangular cross-sectional shape;
first and second tips located respectively at diagonally spaced positions corresponding to two of the four corners of the rectangular cross-sectional shape;
third and fourth diagonally spaced tips located respectively at diagonally spaced positions corresponding to two of the four corners of the rectangular cross-sectional shape;
a first diagonal ridge contiguous to said first and second tips;
a second diagonal ridge contiguous to said third and fourth tips; and
an included angle setting point located at the point of intersection between said first and second diagonal ridges and positioned longitudinally of said shank to bend said first and second diagonal ridges for thereby establishing included angles at said first, second, third, and fourth tips.
2. A perforating punch according to claim 1, wherein said first, second, third, and fourth tips are disposed the same position longitudinally of said shank, further comprising:
a first shear angle setting point bending a first side ridge contiguous to said first and third tips, to establish a shear angle;
a second shear angle setting point bending a second side ridge contiguous to said third and second tips to establish a shear angle;
a third shear angle setting point bending a third side ridge contiguous to said second and fourth tips to establish a shear angle; and
a fourth shear angle setting point bending a fourth side ridge contiguous to said fourth and first tips to establish a shear angle.
3. A perforating punch according to claim 2, wherein said first, second, third, and fourth shear angle setting points are spaced from said first, second, third, and fourth tips in a direction away from said workpiece.
4. A perforating punch according to claim 2, wherein said first, second, third, and fourth shear angle setting points are spaced from said first, second, third, and fourth tips in a direction toward said workpiece.
5. A perforating punch according to claim 1, wherein said third and fourth tips are spaced from said first and second tips in a direction away from said workpiece.
6. A perforating punch according to claim 5, further comprising:
a first shear angle setting point disposed on said first side ridge contiguous to said first and third tips for bending the first side ridge in a direction to reduce a shear angle at the first tip;
a second shear angle setting point disposed on said second side ridge contiguous to said third and second tips for bending the second side ridge in a direction to reduce a shear angle at the second tip;
a third shear angle setting point disposed on said third side ridge contiguous to said second and fourth tips for bending the third side ridge in a direction to reduce a shear angle at the second tip; and
a fourth shear angle setting point disposed on said fourth side ridge contiguous to said fourth and first tips for bending the fourth side ridge in a direction to reduce a shear angle at the first tip.
7. A perforating punch according to claim 5, further comprising:
a first shear angle setting point disposed on said first side ridge contiguous to said first and third tips for bending the first side ridge in a direction to increase a shear angle at the first tip;
a second shear angle setting point disposed on said second side ridge contiguous to said third and second tips for bending the second side ridge in a direction to increase a shear angle at the second tip;
a third shear angle setting point disposed on said third side ridge contiguous to said second and fourth tips for bending the third side ridge in a direction to increase a shear angle at the second tip; and
a fourth shear angle setting point disposed on said fourth side ridge contiguous to said fourth and first tips for bending the fourth side ridge in a direction to increase a shear angle at the first tip.
8. A perforating punch according to claim 5, wherein said first and second tips have cut-off facets.
9. A perforating punch according to claim 1, further comprising flat facets formed by cutting off a convex portion including said shear angle setting point which is spaced from said first and second tips or said third and fourth tips in a direction toward said workpiece.
10. A perforating punch according to claim 1, further comprising flat facets formed by cutting off a convex portion including said shear angle setting point which is spaced from said first and second tips and said third and fourth tips in a direction toward said workpiece.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A self-propelled security vehicle comprising:
a main frame having a central longitudinal axis;
a first support deck positioned essentially juxtaposed in relation to said main frame;
wheels journaled on axles at opposite ends of said main frame and spaced on opposite sides of said central longitudinal axis, at least the spaced wheels at one end of said main frame being driven, the spaced wheels at the front end of said main frame being steerable;
a drive train mounted on said main frame and connected to said driven wheels, said drive train and said axles are in essentially coplanar relationship;
said drive train is located along said central longitudinal axis and at the center of the length of the distance between a front and a rear axle means;
a platform mounted to said main frame at a level substantially above said first deck and connected to said first deck;
means for mounting said platform to said main frame and said first deck comprise tubular support members, at least one of said means for mounting comprises a first vertically oriented tubular member connected to said first deck and extending upwardly to said platform, a second horizontally oriented tubular member connected to said first tubular member at one end and to said platform, a third tubular member connected to the other end of said second tubular member at one end and extending downwardly from said second tubular member and also connected to said first deck at the other end thereof;
at least one seat mounted on said platform;
vehicle controls mounted on said platform adjacent said at least one seat and constructed and arranged to communicate with said drive train and said steerable wheels; and
means mounted to said first deck and said platform to allow at least a driver access to said platform.
2. The self-propelled security vehicle of claim 1 wherein said access means for said platform comprising a plurality of steps extending from said first deck up to said platform.
3. The self-propelled security vehicle of claim 1 wherein said vehicle controls comprise a steering wheel, a throttle control, a brake control and a transmission control.
4. The self-propelled security vehicle of claim 1 wherein said means for mounting said platform to said main frame and said first deck further comprises a plurality of tubular members extending between said platform and said first deck at the front and at the rear of said platform, said tubular members at the front of said platform extend downwardly at an angle with respect to each other so as to form an \u201cX\u201d shape, and said tubular members at the rear of said platform extend downwardly at an angle with respect to each other so as to form an \u201cX\u201d shape.
5. The self-propelled security vehicle of claim 1 further comprising said spaced wheels at both ends of said main frame being driven.