Improvements in or connected with Stone Sawing Apparatus.
Year: 1891

page_text: Date of Application, 18th July, 1891
Complete Specification Left, 16th Apr., 1892-Accepted, 4th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in or connected with Stone Sawing Apparatus.
1, JOHN ANDERSON SANGSTER of St. Clair Street, Aberdeen, in the County
of Aberdeenshire, Engineer and Machine Maker, do hereby declare the nature
of this invention to be as follows:-
This invention relates chiefly to machines for sawing granite though it may also
be applied to apparatus for sawing or cutting other stone and it is designed with
the object of providing driving gear for working the saw frame in which the centre
of the crank which actuates the frames will be maintained throughout the whole
depth of the stone on the same level as the centre of the frame.
In carrying out the invention I construct a vertical casting which supports the
driving gear in form similar to a lathe bed. The vertical casting is provided with
a dovetail, V or other slide upon which moves up and down a sliding head which is
raised and lowered by a screw. At the foot of the main vertical casting is a sole
plate which carries a horizontal shaft and gearing and supports a vertical shaft
which is driven by two hevel wheels from the horizontal shaft. The upright shaft
is slotted throughout its length and carries a bevel pinion with a fixed key or
feather capable of sliding thereon. The sliding head carries a orank shaft by a
connecting rod on which the saw frames are reciprocated. The crank shaft is
driven by a bevel wheel gearing with the sliding bevel wheel on the vertical
shaft.
Above the main vertical casting is a second horizontal shaft which is driven by
a worm on the top of the vertical shaft this shaft carries a disc plate and pin from
which through a connecting rod the feed shaft is intermittently moved. The disc
plate is provided with a slot in which the pin can be set to regulate the throw of
the connecting rod and the amount of feed. The connecting rod is connected to a
friction wheel on the feed shaft on the top of the frame which is caused to revolve
thereby. The feed shaft is, by suitable worm worm-wheel and gearing, in connection
with the chain barrels upon which the chains which support the saw frames are
wound. The intermittent movement of the connecting rod is thus conveyed to the
chain barrels which revolve slowly at intervals thereby causing an automatic variable
feed motion of a very simple character.
The feed shaft is connected by belt and pulleys or by gearing with another shaft
on the main casting which is geared by means of bevel gearing worm or the like
to the screw which raises and lowers the sliding head so that as the feed shaft is
moved to feed forward the saw frame the screw is at the same time gradually
turned and the sliding head and crank shaft lowered with the feed. Instead of
the screw the sliding head may he supported to a chain and barrel similar to the
saw frame supports but I at present prefer the screw.
On the feed shaft are four belt pulleys two fast and two loose which are connected
to the main shafting by means of an open and a crossed belt, by which the operator
can at pleasure by the use of a strap fork or belt setter raise or lower the frame
to any position and at the same time the sliding head which carries the crank
shaft.
Dated this 17th der of July 1801

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Stone Sawing Apparatus.
I, JOHN ANDERSON SANGSTER, of St. Clair Street, Aberdeen, in the County
of Aberdeenshire, Engineer and Machine 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 :-
This invention relates chiefly to machines for sawing granite though it may also
be applied to apparatus for sawing or cutting other stone and it is designed with
the object of providing driving gear for working the saw frame in which the centre
of the apparatus which actuates the frames will be maintained throughout the whole
depth of the stone on the same level as the centre of the frame.
It consists essentially in constructing the apparatus with a vertically sliding head
or support for carrying the crank shaft or other actuating apparatus with suitable
gear for raising and lowering the same and for driving the crank whereby the
relative positions of the crank and the saw frame are maintained the same through-
out the operation of cutting.
It will be fully described with reference to the annexed drawings.
Fig. 1. Side elevation.
Fig. 2. Plan.
The saw frame A with its supporting structure B vibrating rods C raising aud
lowering chains Dand chain barrels E are of ordinary construction.
The driving gear or apparatus for imparting the required to and fro movement
to the saw frame A is supported by a vertical casting or framing F with a dove-
tail V or other slide f, and is carried by a sliding head H which moves up and
down upon the slide f. This sliding head H is raised and lowered by a screw I
actuated by the bevel wheel i. At the foot of the vertical frame F is a sole
plate F¹ which carries a horizontal driving shaft J and supports an upright shaft K
which is geared to and driven by the driving shaft. J by the two bevel wheels j.
The upright shaft K is slotted throughout its length and carries a bevel wheel k
with a fixed key or feather capable of sliding thereon throughout its length and
on the top end a worm k¹. The crank shaft G journalled on the sliding head H is
driven from the sliding bevel wheel k on the upright shaft K through the bevel
wheel g on the end thereof.
The connecting rod L from the crank on the shaft G is connected with the saw
frame A and imparts thereto the required to and fro movement.
On the top of the framing F is another horizontal shaft M with a worm wheel m
which is driven by the worm k¹ on the upper end of the upright shaft K. The
horizontal shaft M carries at one end a disc m' and pin or a crank or eccentric
whereby an intermittent movement is imparted to the feed shaft N through the
connecting rod n and friction wheel N'.
The feed shaft N is placed on the top of the supporting frame B and is provided
at one end with the friction wheel N through which it receives an intermittent"
movement and at the other with bevel wheels n¹ through which the desired move-
ment is imparted to the chain drums E.
The disc plate m³ on the shaft M is provided with a slot in which the pin can be
set to regulate the throw of the connecting rod n and the amount of feed imparted
thereby. The connecting rod n is connected to the friction wheel N¹ by a radius
rod and a friction pawl n whereby at each forward movement of the rod n
the friction wheel N₁ is rotated part of a revolution. The intermittent movement
of the connecting rod n and feed shaft N is conveyed through the bevel wheels n'
and the shafts O O¹ and gearing o o' to the chain barrels E which are thereby
caused to revolve slowly at intervals imparting a variable feed to the saw frame A
as the work proceeds.
Instead of a friction wheel and friction pawl the movement of the connecting

page_text: rod n may be imparted to the shaft N by a ratchet wheel and pawl which engages.
with the teeth thereof.
The feed shaft N also carries a strap pulley P by which it is connected by a
strap with the pulley P' which drives the bevel wheels i of the screw I which
raises and lowers the sliding head H so that as the feed shaft N is moved to feed
forward the saw frame A the screw I is at the same time gradually turned and the
sliding head H and crank shaft G lowered thus maintaining the relative position
of the crank G and the saw frame A constant during the operation of sawing.
On the feed shaft N are three belt pulleys R R R one fast and two loose
which are driven from the main shafting or independent source of power by an
open and crossed belt so that the attendant can at pleasure by the use of a strap
fork or belt setter rotate the shaft N in either direction at a rapid rate to raise or
lower the saw frame A to any position and at the same time the sliding head H and
crank shaft G.
It will be understood that the sliding head H may carry other mechanism than
the crank G for actuating the saws such as direct acting piston from a steam or
other cylinder.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. Apparatus for sawing stone provided with a vertically sliding head which carries
the actuating mechanism moving up and down upon an upright frame and raised
and lowered by a screw actuated from the feed shaft whereby the relative positions.
of the actuating mechanism and saw frame will be maintained approximately the
same throughout the operation of sawing substantially as described.
2. In apparatus for sawing stone the combination with a vertically sliding head
which carries the crank shaft of the upright driving shaft K which conveys motion
to the crank shaft and the horizontal shaft M-provided with worm wheel and pin
disc, the feed shaft N operated intermittently by the connecting rod n friction
wheel N and friction pawl n" and the vertically raising and lowering screw I
actuated from the feed shaft by which the head H is raised and lowered with the
saw frame substantially as and for the purposes described.
3. In apparatus for sawing stone the driving gear or apparatus having the several.
parts constructed and arranged substantially as described.
Dated this 14th day of April 1892.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.