Cutting – Tool or tool with support – Toothed blade or tooth therefor
Reexamination Certificate
1998-10-08
2001-06-12
Rachuba, M. (Department: 3724)
Cutting
Tool or tool with support
Toothed blade or tooth therefor
C083S846000, C083S848000, C083S854000
Reexamination Certificate
active
06244152
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a saw blade for a saw machine, especially for an oscillating saw machine or power saw, and, more particularly, to a saw blade for a saw machine having M-shaped twin teeth on its toothed edge, of which a plurality are alternately set to one side or the other of the blade plane, wherein each twin tooth has two tooth tips pointing in opposite directions so as to be effective for two opposite saw blade motion directions.
2. Prior Art
A saw blade of the above-described type having a row of twin teeth is described in German Patent Application DE 296 00 567. Each twin tooth has a shape corresponding to a printed letter “M” with two tooth tips. The respective twin teeth are set with both teeth tips alternately pointing left or right of the blade plane and permit an especially rapid sawing action.
A disadvantage of this saw blade is that it contacts with its teeth row on a comparatively large area of a work piece to be sawed because of the alternate set of the twin teeth on both sides and because of that true, centered and straight sawing is difficult.
Another saw blade of this type with M-shaped twin teeth is described in U.S. Pat. No. 5,062,338. The tooth tips of each of the twin teeth are curved outward or set in respective opposite directions again with the disadvantage that comparatively poor centering is provided during sawing.
Furthermore a circular saw blade is known from DE 83 37 937 with M-shaped twin teeth that are set alternating left and right and provide comparatively little centering action during a gripping engagement with a work piece.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved saw blade for a saw machine, especially an oscillating saw machine or power saw, of the above-described type that does not have the above-described disadvantages.
This object, and others that will be made more apparent hereinafter, are attained in a saw blade for a saw machine having M-shaped twin teeth on its toothed edge, a plurality of which are set alternately to either one side or the other of the blade, wherein each twin tooth has two tooth tips pointing in opposite directions so as to be effective for sawing in two opposite saw blade motion directions.
According to the invention, some, but not all, of the twin teeth are not set so as to point alternately to either side of the blade, i.e. out of a longitudinal plane of the saw blade, but instead are centered in the plane of the saw blade.
The saw blade according to the invention has the advantage that it can be centered better during sawing so that comparatively smooth straight cut surfaces are provided with cutting efficiency. The gripping power in both directions of motion of the saw blade is equally good because of the symmetric form of the twin teeth.
Besides improved saw motion guidance the saw blade of the present invention provides improved chip disposal, reduced heat generation and permits a higher sawing speed.
In a preferred embodiment of the invention every other or every second twin tooth encountered while traveling in a longitudinal direction along the saw blade is not set so that its tips point out beyond the longitudinal plane of the saw blade on one side or the other. However the remaining twin teeth are alternatively set and alternately point out of one side or the other of the plane of the saw blade.
In a particularly preferred embodiment the non-set teeth extend out from the saw blade edge further than the set teeth. This feature provides further improvements in the cut surfaces due to even better centering during cutting.
In an alternative embodiment the saw blade includes a plurality of M-shaped twin teeth arranged in succession along a toothed edge of the saw blade. Each twin tooth has two tooth tips pointing in opposite directions so as to be particularly effective for sawing in two opposite saw blade motion directions. The respective twin teeth are alternately twisted about a central twist axis in one rotation direction or another opposite rotation direction out from a saw blade plane so that the tooth tips of each twisted twin tooth point in opposite directions out of the saw blade plane. The center of each twin tooth has a V groove that provides similar centering action as the non-set teeth in the other embodiment of the invention described above.
REFERENCES:
patent: 4813324 (1989-03-01), Yoshida et al.
patent: 4913022 (1990-04-01), Kuklinski
patent: 5062338 (1991-11-01), Baker
patent: 5410935 (1995-05-01), Holston et al.
patent: 5918525 (1999-07-01), Schramm
patent: 83 37 937 U (1990-02-01), None
patent: 296 00 567 U1 (1996-11-01), None
Rachuba M.
Scintilla AG
Striker Michael J.
LandOfFree
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