Improvements in Saws or Saw Blades Used for Sawing and Dressing Stone and the like Material.
Year: 1896

page_text: Date of Application, 21st Jan., 1896
Complete Specification Left, 21st Oct., 1896-Accepted, 21st Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in Saws or Saw Blades Used for Sawing and Dressing
Stone and the like Material.
We DAVID HALL and ARCHIBALD HALL of Victoria Road Leeds in the County
of York Stone Merchants do hereby declare the nature of this invention to be as
follows:-
Our invention refers to improvements in the shape or construction of saw blades
used for sawing and dressing stone and like material, in which operation small spheres
of hard cast iron or steel, technically termed "shot," are usually employed; and our
invention facilitates the introduction and use of such shot, so that the sawing operation
is more efficiently performed.
Our invention consists in setting back the blade alternately to the right and left of
the centre plane through the finished blade; the set back being approximately
one fourth to three fifths of the thickness of the blade, and the length of a set back
about three fifths of the depth of the blade, the set back however extending the full
depth of the blade. In other words, the saw blade may be considered formed as a
corrugated plate, the corrugations being preferably nearly rectangular, and the depth
of the corrugations very slight, most conveniently about one fourth to three fifths of
the thickness of the blade.
The blade is preferably formed or pressed to shape when cold, this operation
serving at the same the purpose of the ordinary straightening operation. In forming
the saw blade, the blade is only set back or corrugated to one side, this operation
owing to the blade being set back or corrugated at intervals equal to the width
(i.e. pitch or length) of a set back or corrugation forming simultaneously the set
backs or corrugations in the opposite direction.
It will be understood that the abovementioned dimensions are capable of being
varied within very wide limits.
Dated this 20th day of January 1896
J. CLARK JEFFERSON,
30 Park Row, Leeds, Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in Saws or Saw Blades Used for Sawing and Dressing
Stone and the like Material.
We DAVID HALL and AROHIBALD HALL of Victoria Road Leeds in the County
of York Stone Merchants 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:-
Our invention refers to improvements in the shape or construction of saw blades
used for sawing stone and the like material, in which operation small spheres of hard
cast iron or steel, technically termed "shot" are usually employed; and our invention
facilitates the introduction and use of such shot, so that the sawing operation is more
effectually performed.

page_text: Our invention consists in setting back the blade alternately to the right and left of
the centre plane through the finished blade, the set back being approximately
one fourth to three fifths of the thickness of the blade and the length of a set back
suitably about three fourths of the depth of the blade, the set back however extending
the full depth of the blade. In other words the saw blade may be considered formed
as a corrugated plate or bar, the corrugations being of very slight depth, most
conveniently about one fourth to three fifths of the thickness of the blade.
The blade is preferably formed or pressed to shape when cold, this operation serving
also at the same time to straighten or partially straighten the plate.
In forming the saw blade the setting back operation is only performed at or to one
side, and with intervals equal to the width of a set back; and the supports for
carrying the blade during the operation are placed with their adjoining edges distant
from each other by the same width. As will be evident, this operation forms
simultaneously similar recesses on both sides of the blade.
And in order that our invention and the manner in which the same may be
performed may be more clearly understood, we have annexed hereto the accompanying
sheet of drawings being perspective views of two blades constructed in accordance
with our invention, the top one having comparatively deep recesses. By bevelling
the edges as shewn in the top view, we avoid a reduction at any part of the thickness
of the blade, which occurs when the sides of the set backs are rectangular as shewn
in the lower view..
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
Saw blades for stone and the like material in which recesses are formed alternately
on opposite sides by setting back the body of the blade at uniform intervals from one
side towards the other, substantially as herein set forth and illustrated.
Dated this 19th day of October 1806
J. CLARK JEFFERSON,
30 Park Row, Leeds, Agent for Applicants.