Metal-cutting-saw.
Year: 1892

page_text: Date of Application, 31st Oct., 1892
Complete Specification Left. 22nd July, 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
Metal-cutting-saw.
I, WILHELM HARTMANN, Engineer, residing at Fulda in the Empire of
Germany do hereby declare the nature of this invention to be as follows:-
The present invention is a metal-cutting-saw with teeth which are formed so as
to act better than the teeth of the usual metal-cutting-saws.
Any section of the metal to be worked is offered a greater cutting-edge than
with the ordinary, metal cutting-saws, and besides this, this cutting edge is set
more in accordance with the laws of the working of metal.
The cutting edges are inclined alternately in opposite directions. All the
leading points and all the succeeding points of the cutting edges are at an equal
height, namely in a level which stands normal on the saw-blade. The sides of the
blade may be ground behind the cutting points to the surface of a hollow
cylinder. The leading cutting points may be deeper than the succeeding points of
the same cutting edge, so that every single tooth is set in the manner of a turning-
tool or planing-tool with regard to its cutting edge.
Dated this 26th day of October 1892.
COMPLETE SPECIFICATION.
Metal-cutting-saw.
I, WILHELM HARTMANN of No. 1064 Frankfurterstreet of Fulda, Germany
Manufacturer do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
The present invention is a metal cutting-saw with teeth which are formed so as
to act better than the teeth of the usual metal cutting-saws.
Any section of the metal to be worked is offered a greater cutting-edge than
with the ordinary metal cutting-saws, and besides this, this cutting edge is set more
in accordance with the laws of the working of metal.
By Fig. 1 of the adjoined drawing a saw-blade of this description is represented,
which works in the direction of the arrow, seen from the toothed side.
Figures 2 and 3 show the saw-blade turned to both sides round the teeth, viz.
turned in a right angle.
Fig. 4 is a section to A-B.
The cutting edges a b are inclined alternately in opposite directions. All the
leading points a and all the succeeding points 6 of the cutting edges are at an
equal height, namely in a level which stands normal on the saw-blade. The sides
of the blade may be ground behind the cutting points to the surface of a hollow
cylinder. As a rule that form is chosen of which Fig. 5 is the plan, Figures 6
and 8 are side views, and Fig. 8 is a cross section to CII. It differs from the
arrangement afore described, by the leading cutting points a being deeper than
the succeeding points of the same cutting edge b, so that every single tooth is
set in the manner of a turning-tool or planing-tool with regard to its cutting
edge.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
clain is:
1. In a metal cutting saw the cutting edges a b inclined alternately in opposite
directions as and for the purvose specified.

page_text: 2. In a metal cutting saw the inclined cutting edges a b the leading points of
which are deeper than the other points as described.
3. The metal cutting saw having hollow sides as specified.
Dated this 20th day of July 1893.
WILHELM HARTMANN.