Improvements in or connected with Stone Sawing Machines.
Year: 1898

page_text: Date of Application, 10th Dec., 1898
Complete Specification Left, 9th Sept., 1899-Accepted, 14th Oct., 1899
PROVISIONAL SPECIFICATION..
Improvements in or connected with Stone Sawing Machines.
.
We, EZRA STEAD, of Wellington Bridge, Stone Merchant, and EDGAR RHODES,
of Hanover Works, Hanover Lane, Leeds, Engineer, both in the County of York,
do hereby declare the nature of this invention to be as follows:
This invention refers to that class of stone sawing machines in which the
swing frame is swung on four radius rods from saddles or slides carried on the
framework of the machine. The swing frame above referred to is reciprocated
by means of connecting rods operated by cranks, but as the position of the
cranks remains stationary, whilst the position of the outer ends of the connect-
ing rods is varied according to the height of the stone being cut, he stroke
given to the swing frame is uneven on different sides of the radius rods' centres,
according to the height of the swing frame above or below the centre line of the
crank shaft.
Now the object of this invention is to minimize this defect, and in order to
effect this, I connect the ends of the connecting rods to prolonged arms of the
radius rods which project below the level of the swing frame, whilst the opposite
ends of the connecting rods are attached to cranks which are enlarged in pro-
portion to the length of the arms.
'
The frames are driven through the prolonged arms of the radius rods instead
of being coupled direct to the connecting rods, thus enabling the error of hori-
zontal throw to be corrected in proportion to the length of the arms, as the con-
pecting rods remaining at the same length do not increase their radial movement.
In adapting my invention to a saw frame of the type described in the Specifi-
cation of Stead and Rhodes' Patent No. 30799, A.D. 1897, I swing the swing
frame on radius rods, two of which are carried on studs which are mounted in
horizontal bearings on the saddles. The outer ends of the two studs carry two
arms which are longer by any suitable degree than the radius rods, and the
lower ends of the arms are connected by means of the connecting rods to the
enlarged cranks of the machine. In this manner the advantages gained by the
reduction of error are secured, without interfering with the working of the
machine.
1
1900
Improvements in or connected with Stone Sawing Machines.
We, EZRA STEAD, of Wellington Bridge, Stone Merchant, and EDGAR RHODES,
of Hanover Works, Engineer, both of Leeds, in the County of York, do hereby
[Price 8d.]

page_text: 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 refers to that class of stone sawing machine in which the
swing frame is swung on four radius rods from saddles or slides carried on the
framework of the machine. The swing frame above referred to is reciprocated
by means of connecting rods operated by cranks, but as the axis on which the
cranks turn remains stationary, whilst the position of the outer ends of the
connecting rods is varied according to the height of the stone being cut, the
stroke given to the swing frame is uneven on different sides of the radius rods'
centres, the unevenness increasing according to the height of the swing frame
above or below the centre line of the crank shaft.
Now the object of this invention is to minimize this defect, and in order
that our invention may be clearly understood we will proceed to describe the
same with reference to the accompanying drawings in which similar letters refer
to like parts in both figures.
Figure 1 is a side elevation of so much of a stone sawing machine as is neces-
sary to illustrate our invention, and Figure 2 is an end elevation of the same.
According to our invention, we employ a frame A carrying long saddles B
which are fed downwards in a regular and positive manner by means of a chain
feed C. D are radius links which suspend the swing frame E to the ends of
the shafts F, the latter being supported by the saddles B. One pair of radius
links D are constructed with extensions G which project below the level of the
swing frame E, and the ends of the said prolonged arms are attached to the
ends of the connecting rods H which communicate motion from the crank pins M
of the machine.
The rotation of the cranks or crank discs causes the reciprocation of the con-
necting rods H, which being connected to the extensions G cause the radius
rods D to swing, and thus reciprocate the swing frame E.
The dotted line K in the drawing shews the centre line of the connecting
rods H when the swing frame is in its most effective position, viz.: when it is
being swung evenly on both sides of the centres of the radius links D; but
when the saddles B are in the position shewn at Figure 1 the centre line of the
connecting rod as shewn at K¹ has described an arc K2 which converges con-
siderably within the centre line L of the radial links D.
3.
If the connecting rods H were connected directly to the swing frame E, the
entire amount of the error would be felt by the said swing frame swinging a
very short distance in one direction and swinging a much greater distance in
the other direction; but as shewn in the drawings the connecting rods H are
not connected directly to the swing frame but are attached to the extensions G
of the radial links 1, and although the said extensions still receive the whole
error of the movement, the radial links D are only affected in the proportion of
their lengths compared to those of the extensions G from the swinging centres.
Taking therefore the length of the extensions G from the centres of the shafts F
as being two and a half times as great as the length of the radial links 1), the
amount of error in the swing of the frame E is reduced two and a half times.
The same effect to that above described could be obtained by having the
extensions G keyed to the shaft F, in which case the radial links D would be
also keyed to the shaft F and the latter would then work as a rocking shaft.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. The extension G substantially as and for the purposes set forth.
2. The radial links D suspending the swing frames E to the saddles B, in
combination with the extensions G operated from the crank pins M, substan-
tially as set forth.

page_text: 3. The combination of the radial links D, swing frame E, shafts F, exten-
sions G, and connecting rods H, substantially as and for the purposes set forth.
Dated this 9th day of September A.D. 1899.
BREWER & SON,
London and Leeds, Agents for the Applicants.