Improvements in Saws or Blades for Sawing or Cutting Stone, or for like Operations.
Year: 1895

page_text: Date of Application, 9th Nov., 1895
Complete Specification Left, 10th Aug., 1896-Accepted, 12th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Saws or Blades for Sawing or Cutting Stone, or for
like Operations.
I, RICHARD BRIDGE of Highfield Stone Quarries, Farnworth near Bolton in the
County of Lancaster, Stone Merchant, do hereby declare the nature of this invention
to be as follows, that is to say :—
It relates to saws, plates or blades for sawing or cutting stone whether of grit,
marble or granite formation as also for performing other and like operations and
consists of constructing same so that they will be enabled to perform their functions
more, efficiently while their durability against the abrading actions of the substances
they come in contact with, is greatly enhanced.
To attain this object the blades or saws are made broader in or about their middle or
central parts and narrower towards their outer ends thus they present what is usually
styled a duplex fish-back shape, the outer edges being formed to bulge in the central
part of the blade and by an appropriately shaped curve gradually approach each other
towards both ends.
By employing blades or saws of this formation the grit or abrading substance
used in connection with them is kept better in position for performing the functions
desired of it while what are known as black cuts are entirely prevented, and
provision is made to compensate for the wear of the blades where it is most needed.
The blades may be used in connection with any of the machines at present in
use since their said formation does not in any way interfere with their method
of fixing.
Dated this 7th day of November.
COMPLETE SPECIFICATION.
Improvements in Saws or Blades for Sawing or Cutting Stone, or for
like Operations.
I, RICHARD BRIDGE of Highfield Stone Quarries, Farnworth near Bolton in the
County of Lancaster, Stone Merchant, 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, that is to say :-
It relates to saws, plates or blades for sawing or cutting stone whether of grit,
marble or granite formation as also for performing other and like operations and
consists of constructing same so that they will be enabled to perform their functions
more efficiently while their durability against the abrading actions of the substances
they come in contact with, is greatly enhanced.
In the accompanying sheet of drawings my improved blade a is shown in side
elevation as in the act of cutting a piece of stone this latter being shown in section

page_text: while only such parts of the machinery 9 are illustrated as are necessary to show the
blade a in position.
с
To attain the object of my invention I make the blades or saws a broader in or about
their middle or central parts and narrower towards their outer ends c c¹ thus they
present what is usually styled a duplex-fish-back shape, the outer edges d d' being
formed to bulge in the central part 6 and by an appropriately shaped curvo gradually
approach each other towards both ends c c."
By employing blades or saws a of this formation the grit or abrading substance
used in connection with them is kept better in position for performing the functions
desired of it by reason of the furrow cut in the stone f by said blade a, being
deepest in the middle or central part to which said abrading substances will
thus by gravity tend to fall and from which it will not be so easily moved as when
the furrow is shallowed at this part, while what are known as black-cuts are entirely
prevented and provision is made to compensate for the wear and tear of the blades
where it is most needed.
The blades a may be used in connection with any of the machines at present in
use since their said formation does not in any way interfere with their method
of fixing.
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
claim is:
Saws or blades for sawing or cutting stone the same being formed or shaped
substantially as herein specified.
That this 7th day of Au 1806