Improvements in Cutting Metals, Stone, and other substances, and in Tools and Apparatus employed therefor.
Year: 1890

page_text: Date of Application, 1st Apr., 1890
Complete Specification Left, 27th Dec., 1890-Accepted, 31st Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Cutting Metals, Stone, and other substances, and in
Tools and Apparatus employed therefor.
I. GEORGE RYDER, of Turner Bridge Works, Bolton, in the County of
Lancaster, Roller and Tool Maker, do hereby declare the nature of this invention
to be as follows:-
My invention is applicable to cutting and removing metal stone and other sub-
stances by the employment of rotating cutters of special form applied with or
without special feed mechanism, the object of my invention being to remove the
metal &c., more easily than heretofore.
In constructing a saw for cold sawing metal I make the periphery of the saw of
a spiral in place of a circular form the cutting teeth being of any suitable shape
or size cut round the whole or a portion of the periphery of the saw; where a self-
acting feed is applied to the table on which the metal to be cut is secured I propose
to feed the table toward the saw intermittently by positive gearing from the saw
spindle so that the material is advanced just after the largest diameter of the saw
has passed through the metal by which arrangement each successive tooth of the
saw in one rotation acts upon and removes a certain portion of metal and continues
to do so as long as the metal is fed forward as described.
It is obvious that the metal may be fed forward by hand and that the saw and
spindle may be fed forward or advanced while the metal remains stationary.
Milling cutters used for cutting and surfacing metals may be constructed
according to my invention and by arranging the feed as described such cutters will
be rendered more effective in operation.
My improvements can also be applied to cutters and machines for cutting stone
and other substances the chief feature of my invention being to remove the
material by successive teeth of the cutters acting naturally without being forced
into contact with the substance to be cut.
H. B. BARLOW.
COMPLETE SPECIFICATION.
Improvements in Cutting Metals, Stone, and other substances, and in
Tools and Apparatus employed therefor.
I, GEORGE RYDER, of Turner Bridge Works, Bolton, in the County of
Lancaster, Roller and Tool Maker, 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 is applicable to cutting and removing metal stone and other sub-
stances by the employment of rotating cutters of special form applied with or
without special feed mechanism, the object of my invention being to remove the
metal &c., more easily than heretofore.
In constructing a saw for cold sawing metal I make the periphery of the saw of
a spiral in place of a circular form the cutting teeth being of any suitable shape
or size cut round the whole or a portion of the periphery of the saw; where a self-
acting feed is applied to the table on which the metal to be cut is secured I propose
to feed the table toward the saw intermittently by positive gearing from the saw
spindle so that the material is advanced just after the largest diameter of the saw
has passed through the metal by which arrangement each successive tooth of the
saw in one rotation acts upon and removes a certain portion of metal and continues
to do so as long as the metal is fed forward as described.

page_text: And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying sheet of drawings reference being had to
the figures and letters marked thereon.
The drawing represents two views of a cold saw or tool made according to my
invention for sawing or cutting metal bars or beams.
The periphery of the cutter a is formed of a spiral as shown in Fig. 1 with
teeth in this case all round its periphery and the edge view Fig. 2 shows that the
cutter is made gradually tapering in thickness say from the supporting washers b
to its periphery.
In using my improved cutter the material to be cut is fed forward after each
revolution of the cutter a and the smallest diameter of the cutter being slightly
thicker than the larger diameter and this smaller diameter being the portion which
first acts upon the metal after it has been fed forward it follows that sufficient
clearance is made to free each successive tooth on the cutter whereby nearly all
side friction is removed and the action of the cutter in removing or cold sawing
metal is very much increased while the strain or stress on the cutter is reduced.
It is obvious that instead of feeding the metal forward as described that the saw
and spindle might be advanced while the metal remained stationary.
Milling cutters used for cutting and surfacing metals may be constructed
according to my invention and by arranging the feed to act after each revolution
of the cutter as described such cutters will be rendered more effective in
operation.
My improvements can also be applied to cutters and machines for cutting stone
and other substances the chief feature of my invention being to remove the material
by successive teeth of the cutters acting naturally without being forced into contact
with the substance to be cut.
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 :-
A revolving cutter formed with teeth arranged in a spiral and either with or
without tapered edges substantially as described and as illustrated in the accompany-
ing drawings.
Dated this 24th day of December 1890.
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicant.