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1. The present invention relates to general purpose reciprocating blades, specifically to an improvement to the design of the tip of the typical blade, virtually eliminating the prior art's deflection of the blade over the cutting surface as it attempts to jam through it, minimizing wear and breakage of the blade, and reducing waste of time and money.
2. Whenever the opportunity arises where a cut has to be initiated away from the edges of a surface, whether at an internal point of one plane or at an inside angular intersection of two or more planes, the only blade available is the standard reciprocal general purpose reciprocal saw blade. This existing saw blade has a straightedge sawing edge parallel to one surface plane and a tip or nose created by a sharp angle projected up and behind the nose at an angle less than 90 degrees to meet the opposite edge of the blade. There are several flaws to the design of this widely used prior art.
3. The most obvious flaw of the prior art is that it comes to a tip or nose at the end of the sawing edge opposite to the end that attaches to the saw's motor. Whether the blade's nose is at a 90° or 10° angle to the sawing edge, the nose will always have to jam and dig into the surface before the sawing edge can begin to cut, delaying it's contribution to any sawing until the tip batters and chisels into enough of the material to engage the teeth or abrasive grit coating.
4. Another flaw is the lack of control the prior art's design generates. As the nose of the typical reciprocal blade attempts to penetrate through the surface on the forward stroke, it catches on the surface, ricochets the blade to and fro on the backstroke, and deflects the nose on the next forward stroke, causing the blade to ricochet wildly over the surface as much as two inches in any direction from the desired point of penetration. It takes considerable effort to stabilize the blade while the nose batters chisels and splinters its way through the surface using solely the forward stroke. The blade needs to dig deep enough into the surface before the backstroke begins to saw and stabilize the blade. This hindrance to control of the blade while cutting wastes much time, which leads to loss of efficiency, money and needless damage to the material.
5. An additional flaw in the prior art is t, as the nose of the prior art jams and catches the surface, it causes a destructive S-bend to the blade compromising its integrity and strength. The deflection and skipping across the surface progressively increases the damaging bends to the blade, forcing the operator to repeatedly stop the saw to straighten the bent blade and to start the saw in numerous attempts to return to the desired point of penetration. Consequently, the blade breaks at the bend, increasing overhead costs and waste of time. Whether a job has a deadline or not, it is imperative that the blades used at the site are fast reliable, efficient, and durable. The improvement to the design to the tip of the reciprocating blade has proven superior in all these areas.
6. The tip design of the present invention incorporates an arch up and beyond the straightedge sawing edge of the blade, facilitating a mid-surface interior, and bi-directional penetration into one plane as well as into multi-plane internal angular intersections. This design allows the radial sawing edge to begin cutting immediately upon impact and to saw more concertedly with minimal deflection, chiseling or splintering, thus improving the control, speed, efficiency and durability of the blade, saving time, effort and money. Since the only change is to the tip design of the existing reciprocating blade, fabricating the blade will take minimal adjustment to manufacturers' templates. The initial prototype proved that the modification to the blade tip is undemanding since the design improvement is a forward cutting arch enabling the blade to slide across the surface ensuing immediate bi-directional cutting strokes. Fabricating the blade will take minimal adjustment to manufacturers' templates.
7. Whether a smooth or rough cut is desired with the optional selection of either teeth configuration or abrasive grit coating, the arched/radial tip to the present invention will permit a quick penetrate all types of surfaces at any mid-surface point, efficiently rough-cutting through a wall at a construction site, piercing through the hot metal of a burning car, or cleanly cutting through a marble counter top.
8. Instead of coming to a restrictive point at the end of the straightedge sawing edge, the design of the present invention arches the tip of the blade upward and beyond the cutting plane, thus maximizing from initial impact the blade's reciprocating strokes when the cut needed cannot utilize the outside edges of the plane, and enhancing speed, control, efficiency and durability of the blade.
9.
10. The prior art's chisel-nose design requires the continual battering of the surface
11. As the nose of the blade strikes and batters the surface, the blade ricochets wildly in the air causing the nose of the blade to ricochet wildly across the surface of the material as much as two inches in any direction from the desired point of penetration 3-a to k. The lack of control of the blade's movement and the erratic nature the nose's strikes the surface contributes to inefficiency and frustration. The continual jamming into the surface weakness and compromises the integrity and strength of the blade, creating an “S” shape bend to the blade
12. Instead of coming to a sharp point on the end of the sawing plane, the present invention's tip is at the end of the edge opposite the cutting edge, arching up to meet it
13. In the event TPI are used