Improvements in Stone Sawing Machines.
Year: 1896

page_text: Date of Application, 24th Feb., 1896-Accepted, 2nd May, 1896
Improvements in Stone Sawing Machines.
I RICHARD COX, Park Foundry, Weymouth, in the County of Dorset, Engineer,
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 consists of an improved machine for sawing granite, marble or
stone, provided with an adjustable feed to saw, a regulator for speed, and also
means whereby the saw frame in its reciprocal movement is kept approximately.
horizontal.
I will now describe my invention with reference to the accompanying drawings
in which,
Fig. 1 shews a general side elevation of my machine.
Fig. 2, an end view, and Fig. 3 a plan view.
Fig. 4 shows an enlarged elevation of the means for keeping the saw frame
nearly horizontal, by the employment of a pair of rectilineal levers, which constitute
a modified parallel motion. In this machine I prefer to use eight pairs of these
levers, in the drawings only four are shown.
a is a solid foundation or bed frame composed of rolled iron joists, or the like,
on which I erect four or more vertical pillars or columns b, b, connected together
at the top by a light iron frame. The bed plate a is.preferably longer at one
end than frame b, and on this end I fix two pedestals c, c, which support the main
driving shaft d of my machine. This shaft d is provided with the usual loose and
fast pulleys; balanced fly wheel, and with a double clutch e of any ordinary kind,
a jaw clutch being shown on the drawings. This clutch e may be operated in any
well known way or preferably by means of a worm shaft e journalled at each end
in the pedestals c, engaging with a screwed portion of the clutch bar e pivotted
at e to the frame a, and being provided at the opposite or top end with the
usual fork engaging with a groove round the clutch driver. The worm shaft is
rotated by the handwheel e*. At one end of the main shaft d (outside the
pedestal) is fixed a disc crank d¹ to the crank pin of which is secured one end of
the connecting rod f. The other end of this rod is secured to a pin f² projecting
laterally from the four swinging beams forming the saw frame g which thus receives
a to and fro or oscillating motion, imparted by the crank d. To cause the saw
frame g to move exactly horizontally, I hang it on four pairs of diagonal rectilineal
levers ', g', which in their turn depend from the extremities of a small cross-
head centred upon a short vertical standard g³, bolted to a movable bridge
piece or portion g' of the main frame. More of these levers can be used as preferred,
see Fig. 4.
To give a downward steady feed to the saw frame g, in cutting the stone, I fix a
long screw h, secured in suitable bearings, close and parallel to each of the four
main columns b, b. These screw shafts h, h, are rather longer than the columns b. b.,
and project through the open frame at the top of the machine, and the thread of which
is preferably, of square section. Around each of these screws 1 place a travelling
nut A combined with a guide-socket or collar h2, which embraces the column b.
This collar is further attached to the bridge piece g above mentioned, on which
two pairs of rectilineal levers g' are fixed. It will be seen from the drawings that
the bridge g' connects two of the travelling nuts and sockets together, thus ensuring
a simultaneous action.

page_text: The four screw shafts h are all rotated in a similar manner; viz., by means of a
pair of bevel wheels k, k, driven as hereafter explained.
Over the saw frame I hang in any suitable manner, a water reservoir provided
with a number of taps 1, which serve to keep the stone damp while cutting. This
reservoir is further caused to rise and fall by means of a cord or chain wound on
the drum, turned by a crank handle, and governed by the ratchet and pawl gear
shewn in the section Fig. 3.
The whole machine is driven as follows:-
The main shaft d, is first driven by fast and loose pulleys, or may be driven
direct from an engine. On this shaft d I place two detachable chain wheels m, m³,
large and small, which drive an upper shaft n, through the medium of chains and
another pair of chain wheels n', n².
These chain wheels are arranged to drive at different speeds i.c., the large one
driving the small or vice versa, one pair only being in operation at one time, this
action being governed by the double clutch e.
On this upper or countershaft n, I arrange, first, a set of four change wheels or a
'speed cone pulley o', driving a similar pulley o² on a further shaft o.
Second, a toothed wheel p gearing into a wheel p² on a smaller and lower shaft q.
The shaft o, can therefore be driven either from shaft q through the medium of two
more chain wheeis q', q2 or from shaft n through speed pulleys o¹, o², and by this
means I can give a reverse motion to the screw shafts, whereby the travelling
nuts and saw frame g are caused to rise and fall as explained further on.
The shafts n and g, arc journalled in small pedestals n on the upper frame.
The shaft o is similarly supported in pedestals o³.
.
On the extremities of the shaft o are formed two worms or screws r, r, which
engage with and drive the two worm wheels by means of which the shafts s, s,
are revolved, on which the worm wheels are mounted. On each of these shafts s
I mount two bevel pinions k, k, each of which engages with a bevel wheel k¹ mounted
on the top end of one of the screw shafts h.
It will be seen from the foregoing that I have designed a sawing-machine easily
handled, provided with facilities for fast and slow driving, automatic feed and
with the whole stroke of the saw made effective by keeping same horizontal at all
parts of the stroke.
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:-
1. In a machine for sawing stone and the like, the combination of base, parallel
columns and shafts, with travelling nuts and guide sockets, top frame, pedestals,
main shaft, with fly wheel and pulleys rising and falling feed gear, cone pulley and
clutch, four minor shafts and worm shaft, with their chain and toothed wheels,
pulleys, worms, and other fittings, the swinging saw frame, disc-crank, connecting
rod, levers, crossheads, and brackets, as herein described and set forth.
2. In a machine for sawing stone and the like, the parallel columns and
shafts b, h, with their travelling nuts and guide sockets h¹² as herein described and
set forth..
3. In a machine for sawing stone and the like, the swinging saw frame g, levers
and crossheads g', g, brackets g³ and the rising and lowering gear for saine, with
clutch e; as herein described and set forth.
4. In a machine for sawing stone and the like the adjustable water reservoir / as
herein described and set forth.
Dated this 24th day of February 1896.
S. S. BROMHEAD,
97 Newgate Street, London, Patent Agent.