DE8703531U1 - Circular saw blade for woodworking with step-shaped thickness change and inner and outer radial clearing edges - Google Patents

Description

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Company Röttger Jansen-Herfeld Königstr. 144-146, 5630 Remscheid

Circular saw blade for woodworking with step-shaped thickness changes and internal and external radial clearing edges

Circular saw blades have become known which, in order to increase rigidity through conical grinding, were thinner on the outside than near the clamping flange*,^. These saw blades had several, partly radially offset, clearing edges in order to chip any wood parts that might rub. These saw blades had the disadvantage that leveling was difficult, especially since the conical grinding did not allow exact symmetry to be achieved, since these saw blades had no reference planes for leveling or grinding. The same problem also applies to the attachment and sharpening of the radial clearing edges. Furthermore, these conical saw blades had the disadvantage that the sawdust not thrown out by the teeth on the side of a conical saw blade only had to be pushed through a narrowing gap due to the increasing thickness, thus leading to additional heating of the saw blade.

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To avoid these disadvantages, the circular saw blade according to the invention has a uniform thickness in the outer ring surface, which radially makes up about half of the saw blade protruding from the flange. The ring area further inside also has a uniform thickness, but protrudes the same amount beyond the outer thickness on both sides.

The outer clearing edges are approximately as long radially as the width of the outer, thinner ring area and have a relatively large overhang over the saw blade in order to keep it cool due to the higher peripheral speed there.

The inner cutting edges begin approximately at the step between the outer and inner thickness areas and extend radially inwards to approximately the innermost ring area covered by the clamping flanges and have a smaller projection over the carrier body than the outer cutting edges due to the lower peripheral speed.

To further increase stability, a second change in thickness can be provided in the area of the clamping flange, which extends radially so far that it only slightly protrudes into the sawn joint of the wood.

To eliminate soldering and grinding stresses, the saw blade can be tempered due to its plane-parallel sectors.

To concentrate the centrifugal stresses 1*»**».**·^ 1 &eegr; J _Am O"/«nU1 -»-l.··*- «*^. _M ^x-»-*. □^&Kgr;-^-&igr;&tgr;&ngr;&iacgr;&Ggr;&Tgr; JILWllllCSII J.1I Ut=ItI UU^CUlU^t. VUIl UCl. IJUlIJ. UIl^) , known slots are provided.

Figure 1 shows a saw blade (1) according to the invention with the outer clearing edges (2) and the inner clearing edges (3) and the relaxation slots (4). The tooth base diameter is designated with D. The step-shaped change in thickness is on the step diameter (C). The inner end of the inner clearing edges (3) is at the same time the immersion depth in the wood and is on the diameter (B). The radial slots (4) start from the center bore diameter (A).

Figure 2 shows a sectional drawing according to I/I of Figure 1 with the outer thickness (E) of the saw blade, the inner thickness (F), the tooth width (G), the axial projection of the inner clearing edges (H) and the axial projection of the outer clearing edges (J). The width of the inner clearing edges is designated by K, that of the outer clearing edges by L.

List of symbols

1 saw blade

2 outer cutting edges

3 inner clearing edges

4 relaxation slots

A Center hole diameter

B innermost cutting edge diameter

C Step diameter

D Tooth base diameter

E outer thickness

F inner thickness

G Tooth width

H Overhang of the inner cutting edge

J Projection of the outer cutting edge

K Width of the inner cutting edge

L Width of the outer cutting edge

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Claims (5)

* *·■■·! ti« 4J* · · · · ■ Ii Company Röttger Jansen-Herfeld Königstr. 144-146, 5630 Remscheid claims 1) Circular saw blade (1) with outer clearing edges (2) and inner clearing edges (3) and radially different thickness of the saw blade (1), characterized in that the thickness changes gradually from the outside to the inside, increasingly radially, such that the outer thickness (E) is uniform in the area between the tooth base diameter (D) and the step diameter (C) and the inner thickness (F) is uniform between the step diameter (C) and the innermost clearing edge diameter (B) and the step diameter (C) is approximately in the middle between the tooth base diameter (D) and the innermost clearing edge diameter (B) and the clearing edges have approximately the length of the radial distances between these diameters and the difference between the outer and inner thickness is approximately 0.4 mm and is evenly distributed on both sides. 2) Circular saw blade (1) according to claim 1, characterized in that the area approximately between the innermost cutting edge diameter (B) and the center bore diameter (A) has a uniformly greater thickness than in the area between the innermost cutting edge diameter (B) and the step diameter (C) and this difference in thickness is evenly distributed on both sides. 3) Circular saw blade (1) according to one or more of claims 1 to 2, characterized in that the saw blade surface has a blue, oxidized surface at least in places. 4) Circular saw blade (1) according to one or more of claims 1 to 3, characterized in that the projections of the inner clearing edges (H) are smaller than those of the outer clearing edges (J) and the width of the inner clearing edges (K) is greater than the width of the outer clearing edges (L). 5) Circular saw blade (1) according to one or more of claims 1 to 4, characterized in that radial slots (4) extend from the center bore diameter (A).