Improvements in Saw-blades for Stone-sawing Machines.
Year: 1899

page_text: Date of Application, 14th Mar., 1899-Accepted, 22nd Apr., 1899
COMPLETE SPECIFICATION.
Improvements in Saw-blades for Stone-sawing Machines.
I, GEORGE THOMPSON HARRIS. residing at No. 1809, Wallace Street, in the City
of Philadelphia, State of Pennsylvania, United States of America, Gentleman, 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:.
My invention relates to saw-blades for use in stone-sawing machines for saw-
ing blocks of stone, and it consists of an improved saw-blade adapted especially
for use in that class of stone-sawing machines in which the saw-blade is recipro-
cated horizontally.
In the accompanying drawings illustrating my invention,
Figure 1 is a side elevation of my improved saw-blade, mounted in the lips of
the saw-dog;
Figure 2 is a plan view thereof;
Figure 3 is a section through the line a-a of Figure 1, and
Figure 4 is a section through the line b-b of Figure 1.
My improved saw-blade, the body of which is indicated at A Figure 1, is wedge-
shaped, the taper beginning at a point somewhat below the top of the openings
forming the teeth, and the teeth which are indicated at B, Figures 1, 3 and 4
are formed on the thickened edge of the blade, which is thus the cutting edge,
and are made square on the cutting face. The teeth are formed by notching this
thick edge of the blade by cutting interstices in it at intervals, which, as shown
in the drawing at D, are square interstices, but if preferred, may be round at the
top, there interstices or notch openings being formed by cutting out the metal by
These blades
die-punch, the blade itself being made preferably of rolled steel.
vary in length, in practice, from about twelve feet to twenty feet; their vertical
height or depth is usually about. 93%, inches, in which case the thickness of the
blade at the bottom or cutting edge is 16 of an inch and the top or thin edge
is 16 of an inch. Based upon these proportions the depth of interstices forming
the teeth is made to extend to a point slightly beyond the appreciable taper, gener-
ally 2 to 3 inches in height or depth. The object of this last named pro-
portioning of the parts is to allow the abrading material for which purpose shot
is usually used-to pass down and enter the interstices D between the teeth.
common defect in saw blades has been that they are liable to break easily where
the pin hole is punched through them at the two ends to fasten the blade to the
saw dogs, and to obviate this difficulty, I provide a re-enforcing plate indicated
at E, Figures 1 and 2, riveted on or otherwise secured to one side of the saw blade
at each end thereof, covering the pin hole, said hole extending through the re-
enforcing plate. The blade is to be mounted in the saw dog between the lips e-
thereof (see Figure 2) and is removably fastened therein as usual by the headed
pin adapted to be tightened up and held in place by any usual means such as
screw nut d¹.
A
In my stone-saw blade as thus constructed, the teeth are integral with the

page_text: blade body, and not set in, as frequently done; the blade owing to its re-enforc-
ing plate is much more durable; and by reason of its upward taper towards its top
edge it is economical in construction and enables the abrading material to be
delivered freely at all times to the interstices between the teeth, and hence to the
constant cutting surface.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A saw-blade for stone-sawing machines, consisting of a wedge-shaped blade
the thicker edge of which is punched out at uniform intervals to form square-
faced teeth, said teeth being of a depth sufficient to include an appreciable part
of the taper formed by the wedge-shape of the blade, substantially as described.
2. A saw-blade for stone-sawing machines, consisting of a wedge-shaped blade
the thicker edge of which is punched out at uniformi intervals to form square-
faced teeth of a depth sufficient to include an appreciable part of the taper formed
by the wedge-shape of the blade, and provided at each end with a re-enforcing
plate riveted or otherwise secured thereto, substantially as described.
3. A saw-blade for stone-sawing machines, consisting of a wedge-shaped blade
the thicker edge of which is punched out at uniform intervals to form square-
faced teeth, of a depth sufficient to include an appreciable part of the taper formed
by the wedge-shape of the blade, and provided at each end with a re-enforcing
plate riveted or otherwise secured thereto, the re-enforcing plate and blade being
recessed to adapt it to receive a locking-pin operating to secure the blade within
the lips of the saw-dog, substantially as described.
T
3
101
3
1000
D. YOUNG & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.