Cutting – Tool or tool with support – Toothed blade or tooth therefor
Patent
1984-09-11
1986-05-13
Schran, Donald R.
Cutting
Tool or tool with support
Toothed blade or tooth therefor
83855, 83835, B27B 3308, B27B 3312
Patent
active
045878765
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a saw blade for preparing wood and other materials, wherein the teeth each have a cutting edge and a rounded base between the teeth.
BACKGROUND
Numerous ways of shaping the teeth of saws are already known, and these are variously designed according to the purpose for which they are intended and the materials to be sawn.
THE INVENTION
It is our object to create a saw blade with which a considerably higher cutting performance is possible than with conventional saw blades.
As tests have shown, the cutting performance of saw blades in accordance with the invention exceeds that of the usual commercially available saw blades by a surprising amount. This can be explained by the fact that a paring-action cutting process takes place, and the shavings can flow away unhindered. Even hardwoods which are difficult to work with can be sawn very much better with these saw blades than with conventional saw blades. The blade geometry produces adequately strong teeth, which do not tend to break off despite the relatively acute cutting angle. Moreover, the teeth may be reground many times.
Embodiment examples of the subject of the invention are shown on the Drawing.
FIG. 1 is a partial view of a circular saw blade, showing the geometry of the teeth.
FIG. 2 shows a single tooth of a saw blade intended for movement in a straight line.
FIG. 3 is a view of a tooth with an inserted hard metal cutting edge.
FIG. 4 is a section through the tooth fitted with a hard metal tip or cutting edge as shown in FIG. 3.
FIG. 5 shows a section of a circular saw blade wherein the teeth are fitted with a sintered hard metal insert.
FIG. 6 shows a section of a circular saw blade wherein the teeth are fitted with a cast hard metal cutting edge or tip.
FIG. 7 shows a section of a saw blade intended for straight-line movement, wherein the teeth are fitted with a sintered hard metal cutting edge or tip.
The circular saw blade shown in FIG. 1 has a diameter in the magnitude of approximately 50-1500 mm, and is used for preparing hard or soft wood and similar materials, such as laminated material made from wood. The teeth of a circular saw blade 1 of this kind have a shaping which differs from the conventional design. Each tooth comprises a face 2 and an adjoining curved section 3. This curved section 3 continues smoothly into the rounded base 4 between two teeth, and then continues on into the back 5 of an adjacent tooth, thus forming the space between two teeth. The curved section 3 is cut back relative to an imaginary straight line F drawn as a continuation of the face 2 and, together with the base 4 between the teeth, forms a circular curved section 3 with a radius r. The centre point m of this radius r is located at least approximately on a radius R plotted from the center point M of the circular saw blade to the cutting edge or tip 6 of the tooth. A tangent T drawn to the circumferential circle of the circular saw blade 1 and passing through the cutting edge 6 of the tooth (thus, extending at right-angles to the radius R) forms an angle of intersection .delta. of less than 60.degree., namely 45.degree.-55.degree., and preferably approximately 45.degree.-52.degree., with the face 2 and the straight line F. The length L of this face 2 corresponds to approximately 2/3 of the tooth width or cutting width. The face 2 and the back part 15 which directly adjoins the cutting edge 6 of the tooth are straight in construction. The length L of the face 2 becomes greater as it is reground, and may then correspond to approximately twice the thickness of the tooth.
The cutting width amounts to approximtely 3 mm with a circular saw diameter of 200 mm and approximately 4 mm with a diameter of 500 mm, and is correspondingly graduated for intermediate width.
The clearance angle .alpha. amounts to 5.degree.-18.degree., and preferably approximtely 15.degree.. The radius r amounts in this instance to approximately 1/4 of the pitch of the teeth. The curved section 3 which forms the cut-back section and the tooth base 4 run smoothly into on
REFERENCES:
patent: Re15038 (1921-02-01), Culley
patent: 239098 (1881-03-01), Hill
patent: 464855 (1891-12-01), Clark
patent: 481201 (1892-08-01), Schlabach
patent: 3288180 (1966-11-01), McLean et al.
patent: 3362446 (1968-01-01), Potomak
patent: 4324163 (1982-04-01), LaVelle
Saws and Sawing Machinery by Eric N. Simons, p. 93 (1946), published by Pitman & Sons.
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