Improvements in and relating to Stone-cutting or Stone-sawing Machinery.
Year: 1889

page_text: Date of Application, 6th May, 1889
Complete Specification Left, 6th Feb, 1890-Accepted, 26th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in and relating to Stone-cutting or Stone-sawing
Machinery.
We SAMUEL DEARDEN and WILKINSON DEARDEN both of Barkerhouse Road,
Nelson, in the County of Lancaster, Stone Merchants and Monumental Sculptors, do
hereby declare the nature of this invention to be as follows
--
This invention moie particularly relates to that class of stone cutting or sawing
machinery in which the saw frame is horizontally disposed in the machine The
saw frame may be suspended, in the usual manner, by 4 chains wound upon a roller
to which a slow revolving movement is imparted, to cause a slow and gradual descent
of the saw frame during the sawing process, and while the blades are penetrating
the stone or like substance under operation. The crank shaft actuating the saw frame
in a to and fro manner has previously been placed in journals in a fixed and
determined position, consequently as the saw frame varied its position from a horizontal
plane or straight line with the crank shaft, an uncertain and irregular motion was
imparted to the saw frame
This invention of improvements consists essentially in mounting the crank shaft on
a movable frame, to which a slow gradual descending motion is imparted to
maintain the crank shaft and the saw frame in a borizontal plane during the sawing
process.
For this purpose we erect an upright upon which a movable frame is capable of
sliding upwards and downwards, being so actuated by a vertical screw which takes
into a chased bush fixed to the said movable frame. During the operation of sawing
the movable frame carrying the crank shaft is caused to descend slowly by means of
a catch lever acting upon a ratchet wheel attached to, or in connection with, the
vertical screw.
The saw frame after the operation of sawing, is raised at an increased rate of
speed to that of its descent, both the saw frame and the frame carrying the crank shaft
rising and falling together.
The crank shaft may be actuated by means of a rope pulley upon which the rope
is made to embrace a considerable portion of its circumference by means of two guide
pulleys.
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THOS. RICHMOND,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and relating to Stone-cutting or Stone-sawing
Machinery.
We, SAMUEL DEARDEN and WILKINSON DEARDEN, both of Barkerhouse Road,
Nelson, in the County of Lancaster, Stone Merchants and Monumental Sculptors, 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 more particularly relates to that class of stone cutting or sawing
machinery, in which the saw frame is horizontally disposed in the machine. This
saw frame may be suspended, in the usual manner, by four chains wound upon
rollers, to which a slow revolving movement is imparted to cause a slow and
gradual descent of the saw frame during the sawing process, and while the blades
are penetrating the stone or like substance under operation.

page_text: The crank shaft, actuating the saw frame in a to and fro manner, has previously
been placed in journals in a fixed and determined position. Consequently as the
saw frame varied its position from a horizontal or straight line with the crank
shaft, an uncertain and irregular motion was imparted to the saw frame.
This invention of improvements consists essentially in mounting the crank shaft
on a movable fiame, to which a slow descending motion is imparted to maintain the
crank shaft and saw frame in a ho11/ontal plane during the sawing process. For
this purpose, we erect an upright, upon which a movable frame is capable of sliding
upwards and downwards, being so actuated by a vertical screw which takes into a
chased bush, fixed to the said movable frame.
During the operation of sawing, the movable frame carrying the crank shaft is
caused to descend slowly by means of a catch lever, acting upon a ratchet wheel,
attached to, or in connection with, the vertical screw.
The saw frame, atter the operation of sawing, is raised at an increased rate of
speed to that of its descent, both the saw frame and the frame carrying the crank
shaft rising and falling together. The crank shaft may be actuated by means of a
rope pulley, upon which the rope is made to embrace a considerable portion of its
circumference by means of two guide pulleys.
In the accompanying drawings Fig 1 represents a sectional elevation of a stone
sawing machine constructed in accordance with our invention. A is an upright,
upon which slides frame B, carrying crank shaft C, connected by arm D to
saw frame E, and to keep and maintain the crank shaft at the same level as the saw
frame, it is gradually lowered in unison with the descent of the saw frame during
the sawing process For this purpose, the screw spindle G is employed, working in
a chased bush H, fixed to movable frame B, and so actuated through the medium
of bevel gear I, catch lever J, and ratchet wheel K, as to cause a gradual descent
of the movable frame B and crank shaft C. To drive the said shaft, and at the same
time admit of the rising and falling action of the movable frame B, the endless
rope N is provided, and stretched between the groove pulleys O and P, and made to
embrace a considerable portion of the pulley E, (fixed to crank shaft C) by means of
guide pulleys R and S, as will ensure a proper drive without slip. Either of the
pulleys and P may be the driver, as may be the most convenient.
To relieve the screw spindle as much as possible of the weight of the movable
frame B and the parts E, R, and S, a balance weight is employed, attached at one
end of chain T, which passes over an elevated roller not shewn.
Having now particularly described and ascertained the nature of our said. inven-
tion, and in what manner the same is to be performed, we declare that what we
claim 19:-
In a stone sawing machine, the rising and falling crank shaft C, operating sub-
stantially as described for the purpose set forth.
Dated this 5th day of February 1890.
THOS. RICHMOND,
Agent.