Year: 1887

page_text: I, SAMUEL SIDNEY BROMHEAD, of 97 Newgate Street, London, E.C. Patent
Agent, (communicated) 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: ·
.
The present invention has relation to that class of stone-sawing machines in which
the saw-blade is raised by suitable mechanism at the end of the stroke and lowered at
the beginning of the next stroke, whereby the kerf can be cleared of debris while the
saw-blade is in operation.
The object of the invention is to provide simple and effective means for raising and
lowering the saw-blade at the end of the stroke; also, improving the machine in the
several details of construction, whereby a more perfect action of the saw-blade is
obtained, and the motion thereof more readily controlled. These several objects above.
enumerated I attain by the construction substantially as shown in the drawings, and
hereinafter described and claimed. Figure 1. of the drawings is a side elevation of my
improved machine for sawing stone and driving mechanism for imparting to the saw-
blade the required reciprocating motion; Fig. 2, a top plan view of the same; Fig. 3,
an end view; Fig. 4, a detail view in perspective of the saw-blade carrier, also the
feed-nut detached from the carrier; Fig. 5. a detail view in perspective of the slotted
plate employed with other mechanism for lifting the saw-blade and carrier at each end
of the stroke; Fig. 6. a detail view in perspective, showing a modification of the
carrier; and Fig. 7, a detail view in perspective of the mechanism employed in
connection with the slotted plate for feeding the saw-blade in a downward direction
when cutting both ways.
In the accompanying drawings, A. represents the frame of the machine of any
desirable form and construction, and is provided, near one end, with the usual gulleys,
ab B, over and around which pass driving-belts c d. The arrangement of the
pulleys and belts is of the common form, and therefore I lay no claim thereto, and, if
preferred, any suitable or well-known driving mechanism may be employed.
Within the frame A is supported the sashes C, by means of the rollers e, working on

page_text: short tracks f, secured to the inner sides of the frame of the machine. Below the
tracks f, at a suitable distance therefrom, are guides g. 9, to guide the sashes in their
reciprocating motion. If preferred, the lower ends of the sashes, and also the top, may
be connected together by suitable braces,.h i, respectively, as shown in Fig. 2. Any
suitable means, however, may be employed for connecting the sashes together, as found
most preferable.
The saw-blade D may be of any suitable construction usually employed for sawing
stone, either a plain cutting-edge or diamond saw-teeth being used, as desired. The
ends of this saw-blade are connected to carriers E, of the construction shown in either
Figs. 4 or 6, the same having rollers ; upon their sides, which bear upon upright
guides upon the inner sides of the sashes (. The carrier, as shown, in Fig. 4, at its
back end is cast with transverse bars 1, through which pass the screw-threaded ends of
the usual saw-buckles, and receive upon their screw-threaded ends the usual tightening-
nuts, the opposite ends of said buckles being attached in the ordinary manner to the
saw-blade. These buckles are of the usual construction, and are for the purpose of
tightening the saw-blade, said blade at its extremities passing between lugs 'n upon the
interior top and bottom of the carrier, as shown.
The carrier E is cast with an opening, o, of any preferred shape to correspond with
the shape of the sectional nut F, said nut having wings p, which fit in lateral grooves
of the opening o, for the purpose of retaining the nut in a more steady position.
have shown this nut on an enlarged scale and square in cross-section, and therefore it
should be understood that it is not of natural size or shape compared with the opening o,
as both the sectional nut with its wings and an opening to correspond therewith, in
which the nut is to be inserted, is common in this class of machines, and therefore
many modifications can be made therein without departing from the principle of my
invention. The feed-screws G pass loosely through holes in the carriers and engage
with screw-threaded holes s of the nuts F, whereby the carriers are moved up and
down.
In Fig. 6, which is a modification of the saw-blade carrier, in place of the lugs n
transverse plates H are employed, having notches t, in which passes the extremity of
the saw-blade. These plates are made vertically adjustable, also horizontally adjust-
able, by means of slots and set-screws, or in any other well-known and preferred
manner, thereby enabling the saw-blade to be kept in a true vertical line by the
adjustment of the plates, and also adapting the carriers to saws of different widths.
The lugs n, as well as the notches t, are for the purpose of steadying the saw-blade
while in motion.
The upper ends of the feed-screws G are provided with gear-wheels I, with which
engage the teeth of pinions u, said pinion terminating at its upper end in a beveled
gear-wheel, v. These pinions are mounted upon suitable studs projecting upwardly
from a central brace, w, secured to the upper ends of the sashes C, as shown more
clearly in Fig. 2. The gear-wheels vengage with similar gear-wheels, x, upon the
ends of a horizontal shaft, a', which has its bearings in the central brace between the
sashes. The inner extremity is formed square or flat-sided, as shown at b, (Fig. 1—2)
and passes through a similarly formed sleeve, c¹, upon the end of which is rigidly
connected to or formed with a beveled gear-wheel, K, with which engage gear-
wheels d'e¹, upon the inner ends of transverse shafts f¹ g¹.
The crank-shaft of the belt or driving pulley B is connected to the shaft f' by
means of pitman ¹, ratchet-wheel j¹, and pawl k¹. The shaft g¹ is provided upon its
outer end with the pulley a, herein before described, and also with two loose pulleys.
(Shown in dotted lines, Fig. 1.) The driving-shaft or crank-shaft h is provided
with a crank, l, to which is attached the pitman L, said pitman in turn being connected
in any suitable manner to the sashes C. The shaft h' is also provided with a second
crank, m³, to which is connected a pitman, M, the opposite end of said pitman
being connected in any suitable manner to a longitudinally-sliding block, N, said block
having a horizontal slot, n, with which engages a crank-pin, o', on the crank-wheel 02.
To the crank-wheel 2 are connected the ends of rods PQ, the opposite ends thereof
being attached in any preferred manner to arms p¹, upon a screw-sleeve, R-one upon

page_text: each of the feed-screws G. The screw-sleeves R extend over the smooth portion of
the feed-screws G, and the upper ends thereof, and move independent of said feed-
screws, and around the sleeves are nuts or boxes S, as shown in Fig. 3, which engage
with the threads thereof. Suitable nuts are employed to keep the sleeves R in position
on the feed-screw. The block N slides between the incline-faced guides T U, whereby
the block N is given a downward motion as it is projecting forward in a longitudinal
direction and brings or carries the crank-wheel 02 partially around.
In the operation of the machine motion is imparted to the saw-blade D by means of
the driving-pulley B, belt d, and pitman-connection L with the sashes C, carrying the
sashes and saw-blade forward to cut the stone. At the completion of the stroke the
crank-and-pitman connection Mm' with the block N move the block forward, and by
means of the pin o' the crank-wheel 02 will be turned, and through the medium of the
rods PQ and arms ¹ the screw-sleeves R will be turned, and thereby lift the feed-
screws G with it, and in turn the feed-screws lift the carriers E and saw-blade D while
the latter is coming back. When the saw is cutting the stone, the blade is fed
downwardly by means of the shaft and gear-wheel d¹, engaging with the gear-
wheel K, turning the shaft a', and by means of the gear-wheels thereon engaging
with the gear wheels v, and the pinions u, engaging with the gear-wheels I, the feed-
screws G are turned in the proper direction to lower the carriers E and feed the:
saw-blade, as required while cutting the stone. By means of the shaft g¹, the belts
and tight and loose pulleys, hereinbefore described, and the gear-wheels et K, with the
gearing above described for feeding the saw-blade, said blade may be raised or lowered
while the saw is not in motion, to adjust the blade to the varying heights of the stone
to be sawed, and to raise the blade out of the stone after it has been cut. It should
be understood that the manner of connecting the gear-wheel K to the shaft a¹, as
hereinbefore described, admits of the shaft moving longitudinally in the sleeve c¹ of
said wheel without interfering therewith; but when turned the shaft will turn with it.
When it is desired to have the saw cut both ways when moving both backward and
forward, the block N, guides TU, and the crank-and-pitman connection M m are
dispensed with and a slotted plate, W, (Fig. 5) substituted, said plate being made
stationary on the frame of the machine in any well-known manner. This plate W
has an inclined slot, ¹, which terminates at its end in-inclined extremities s¹, the
crank-pin o¹ of the crank-wheel O' engaging with the slot 1. The inclination of tho
slot will cause the crank-wheel to turn downward at each end of the stroke when
the sashes are moved forward and backward.
In order to feed at each end of the stroke, the crank at the extremity of the shaft h¹
is removed and the cam A¹ (Fig. 7) substituted, and a bracket, t, is secured to the
frame A, which has pivoted thereon an arm, B1, slotted at its upper end for attachment
thereto of the pitman ¹, a spring, u, upon the bracket keeping the lower end of the
arm B¹ pressed against the cam A¹. When the shaft h¹ is rotated, it carries with it
the cam A', which is brought in contact twice in its revolution against the pivoted
arm B¹, thereby giving the required motion to the pitman ¹ to feed the saw-blade
downward at each end of the stroke.
It will be noticed that the boxes S are stationary at all times in the sashes C, said
boxes being connected thereto by transverse braces wl, as shown in Fig. 3, and the
screw sleeve R, which fits loosely over the smooth end of the feed-screw G, is turned
by means of the arms p¹, which are connected to the mechanism herein before described,
and the screw-threads on the sleeve, engaging with the interior screw-threads on the
hoxes S, will cause the feed-screw to be raised or lowered as desired.
Having now fully described my invention, what I claim as new, and desire to
secure by Letters Patent, is-
1. In a machine for sawing stone, the sashes C, provided with guides g. g¹ in com-
bination with the saw-blade D and carriers E, having notches or lugs and rollers, and
the feed-screws G, extending through the carriers, and mechanism, substantially as
described, for operating the screws to raise or lower the carriers, substantially as and
for the purpose set forth,

page_text: 2. In a machine for sawing stone, the combination, with the saw-blade carriers
provided with lugs or notches for receiving the ends of the blade and opening O,
having transverse slots q, of the sectional boxes F, having transverse wings p, sub-
stantially as and for the purpose described.
3. In a machine for sawing stone, the combination, with the movable sashes C and
saw-blade D, connected to suitable carriers, of the feed-screws G, screw-sleeves R,
engaging with the interior screw-threads on stationary boxes S, and means for
operating said sleeve, whereby the saw is raised or lowered, substantially as and for
the purpose set forth.
4. In a machine for sawing stone, the shafts f¹ g¹, provided on their inner end with
gear-wheels d' e¹, the former. one of the shafts connected to a crank on the driving
shaft by means of the pitman ¹, ratchet j¹, and pawl K¹, and the former-mentioned
shaft connected to the driving-shaft by means of belts and pulleys, in combination
with the shaft a¹, having a flat-sided extremity, 61, and the gear-wheel K, provided
with sleeves c¹, adapted to slide thereon, and operating as described, and the gear-
wheels, pinions u, and gear-wheels 1, and suitable mechanism for operating the
everal shafts, whereby the feed-screws are also operated, substantially as and for the
purpose specified.
5. In a machine for sawing stone, the combination, with the inclined guide
blocks TU, of the slotted guide-block N and the crank-wheel 02, engaging with the
slot by means of pin o¹, and suitable devices connected with the crank-wheel for
operating the screw-sleeves R, substantially as and for the purpose set forth.
6. In a machine for sawing stone, the feed-screws G, screw-sleeves R, and stationary
boxes S, in combination with arms P Q, crank-wheel O2, and suitable mechanism for
operating said crank-wheel, substantially as and for the purpose specified.
7. In a machine for sawing stone, the combination, with the crank-wheel 02, of the
stationary plate W, having inclined slot, and inclined extremities s¹, whereby the
saw is made to cut both ways, or in both directions, substantially as and for the purpose
specified.
8. In a machine for sawing stone, the shaft f¹, connected with suitable gearing for
operating the shaft a¹, and the pitman ¹, in combination with the pivoted arm B¹,
spring u, and cum-wheel A¹, the latter being connected to the extremity of the
shaft, substantially as and for the purpose set forth.
9. In a machine for sawing stone, the inovable sashes C, saw-blade D, and carriers E,
to which they are connected with the feed-screw G, provided at their upper end with
gear-wheels I, screw-sleeves R, and boxes S, inclosing the sleeves, and the pinions and
gear-wheels u. v. x, the latter being connected to the ends of the shaft a¹, and means
for operating said shafts, substantially as and for the purpose set forth.
10. In a machine for sawing stone, the sashes C, provided with suitable guides, g,
and having connected thereto stationary screw-boxes S, in combination with the feed-
screws G, screw-sleeves R, carriers E, provided with wheels j, and the wheels or
rollers e, supported on tracks f, secured to the frame of the machine, substantially as
and for the purpose set forth.
11. In a machine for sawing stone, the crank-wheel 02, an inclined slotted plate, W,
in combination with the pivoted arm B₁, spring u¹, and cam-wheel A¹, and suitable
intermediate connections for operating the shaft a¹, and the sleeves R, substantially as
and for the purpose set forth.
T
S. S. BROMHEAD,
97, Newgate Street, E.C.,
Patent Agent.