Year: 1887

page_text: Date of Application, 14th Nov., 1887
Complete Specification Left, 2nd Aug., 1888
Complete Specification Accepted, 14th Sept., 1888
We JOHN THOMAS HILL of Montgomery Road Manager, and EDWARD LLOYD
WYNYARD BELLHOUSE of Darnall Road, Engineer, both of Sheffield in the County of
York, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to improve and simplify the construction of machines
for cutting the teeth of files and other like serrated articles.
A file cutting machine made according to our invention, consists of a standard or
body cast to a suitable shape to receive the working parts; the upper portion of which
carries the driving shaft and cam, the helve or arm with the chisel or cutter, and the
presser: the lower portion forms a slide upon which the bed or cradle travels, and it
also carries the feed motion.
The driving shaft may be arranged to be worked by steam power, or other power,
and is provided at the front end with a volute cam, fixed over the tail end of a small
helve or arm which is supported by and works upon an axis or between adjustable
centres.
The incline of the cam rests upon the head of an adjustable tappit or facing, by
means of which the action of the helve or arm can be varied as desired, and above the
helve is a slide block (which can be raised and lowered by means of a screw and hand
wheel) carrying a spring which presses upon the said helve, and by which the power
of the blow and consequently the depth of the cut by the chisel is regulated.
The chisel is carried at the extremity of the helve by a swivelling chisel holder, so
that the angle of the cut can be varied.
The slide upon which the bed and cradle travels is formed at a suitable angle between
a vertical and horizontal position, any lateral movement of the sliding bed being
prevented by suitable guides.
The bed with its cradle or file holder is free to slide from one end to the other of
the fixed slide, as we dispense with the usual guide screw or rack but we attach a
weight by means of a chain (or equivalent means) to the bottom end of the bed, its
tendency being to draw the bed to the bottom of the inclined slide.

page_text: An intermittent feed motion is obtained in the following manner; on the driving
shaft at the back of the standard we fix an eccentric with its rod connected to a series
of levers or arms, and terminating with a pawl or catch which operates a ratchet wheel
fixed upon a short horizontal shaft by which means an intermittent rotary motion is
obtained.
On the said horizontal shaft is a worm gearing into a worm wheel fixed upon a
short vertical shaft at the end of the slide. The worm wheel can be instantly secured
to or made to run loose upon the vertical shaft by means of a clutch under the control
of the operator, and a suitable brake gripping the before mentioned horizontal shaft
prevents backlash or overrunning of the feed motion.
Upon the top of the vertical shaft and level with the end of the sliding bed or
thereabouts we fix a winding block of nearly circular shape and to its periphery we
secure a steel tape or its equivalent, the other end of which is similarly secured to the
sliding bed.
The presser consists of a lever and weight and a vertical arın terminating with a
suitable steel finger or presser by which the work is firmly held down; a hand lever
to raise the presser is brought to a convenient position for the workman to use.
The mode of operation is as follows; a file blank being fixed upon the bed, and the
said bed being drawn down to its lowest or most suitable position for the first cut of
the chisel, the clutch is put into gear, and the machine started; the revolving cam
presses down the tail, and raises the head of the helve with the chisel at the same time
compressing the spring, and when the ridge of the cam (or its highest point) is past
the reaction of the spring forces down the helve, and the impact of the chisel produces
a tooth upon the file blank.
The action of the feed motion now gives the winding block a slight turn, and the
metallic tape draws up the sliding bed the required distance, in time for the next cut
of the chisel; the operation being repeated until the cutting is completed.
De 1511
1007

page_text: Improvements in Machines for Cutting Files and other like
Articles.
We JOHN THOMAS HILL of Montgomery Road, Manager, and EDWARD LLOYD
WYNYARD BELLHOUSE, of Darnall Road, Engineer, both of Sheffield in the County of
York 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 object of this invention is to simplify and improve the construction of machines
for serrating purposes, especially for cutting the teeth of Files.
The annexed sheet of drawings represents in Figure 1, a front elevation, and in
Fig. 2 a side elevation of one of our improved machines especially adapted for cutting
the teeth of files.
It consists of a standard or body A, cast to a suitable shape for receiving the
working parts the upper portion of the standard carries the driving shaft B, with
the cam C, also the helve or arm D, with the chisel or cutter E, and the presser F,
the lower portion forms a slide G, upon which the bed H. and cradie O travel longi-
tudinally, and it also carries the feed motion.
The driving shaft B, may be arranged as shown to be worked by steam power, or it
may be driven by hand, and it is provided at the front end with a cam C, projecting
over the end of a small helve or arm D, supported by and working upon an axis I, or
adjustable centres.
The periphery of the cam rests upon an adjustable tappit J, by altering the position
of which the action of the helve can be varied as desired.
Above the helve is a slide K, which can be raised and lowered by the hand wheel
and lever L, or by other convenient means, the slide K carries a spring M, which
presses upon the helve and by which the power of the blow and consequently the
depth of the cut made by the chisel E can be regulated.
The chisel E, is carried at the extremity of the helve, by a swivelling chisel
holder N, to enable the chisel to be fixed at any angle with the bed H.
The slide G upon which the bed H travels is made with its face at the desired angle
of inclination between a vertical and horizontal position, and suitable guide strips or
grooves prevent any side movement of the bed H.
The cradle O has the usual movements of such parts, and with the bed, can slide or
be moved from one end to the other of the fixed slide G, the usual screw or rack being
dispensed with, but we attach a weight P, by means of a chain (or its equivalent) to
the bottom end of the bed H its tendency being to draw the bed to the bottom of the
inclined slide G.
An intermittent feed motion is obtained in the following manner; on the driving
shaft B. at the back of the standard, we fix an eccentric Q, having a rod which
terminates with a pawl or catch R, engaging in a ratchet or index wheel S. fixed upon
a short horizontal shaft, carried at the end of the slide G; the action of the eccentric
rod and pawl R, is to impart an intermittent rotary motion to the said shaft.

page_text: At the opposite end of the shaft is fixed a pinion T, gearing into a wheel U. fixed
upon a vertical shaft also carried at the end of the slide; upon the vertical shaft and
working in a bracket, is a slide block V, which can be raised and lowered by the
handle V. and thus move the pinion V2 in and out of gear with the wheel V3 when-
ever desirable. W is a brake or friction clutch of any suitable form of construction,
so applied to the shaft as to prevent backlash or over running of the feed motion.
Upon the top of the short vertical shaft carrying the wheel V³ and level with the
end of the sliding bed, or nearly so, we fix a winding-block X, the periphery being of
a nearly circular shape, and to which we secure a steel tape, or band Y (or its
equivalent), the other end being securely fastened to the sliding bed H. If the
win ling-block was circular the bed would be drawn up at an equal rate throughout
the extent of its travel, and for some kinds of work this would be correct, but for
taper files on the points of which it is advisable to cut the teeth finer and closer
together, we use a cam shaped winding block, which at one part of its periphery will
wind up the steel tape more slowly than the rest, and thus cause the teeth to be cut
closer, the attendent at such time reduces the pressure of the spring M upon the helve
and consequently a finer cut tooth is the result.
The pressure F, consists of a lever and weight, and a vertical arm terminating with
a suitable finger plate or presser, by which the file or other work is firmly held down
while being operated upon, a hand lever F by which the presser can be instantly
raised from, and lowered upon the file, is brought to a convenient position for the
workman to operate. Instead of a pinion T and wheel U, in the feed motion, a worm
and worm-wheel may be used, the wheel being secured to or released from the shaft.
by a clutch of ordinary construction.
The mode of operation is as follows; a file-blank being fixed upon the cradle O,
and the bed being drawn down to the required distance for the first cut of the chisel,
the pinion V is put into gear with the wheel V³ and the pressure resting on and
holding down the file, the machine is started.
The revolving cam presses down the tail end of the helve and raises the cutter, at
the same time compressing the spring M, and when the highest point of the cam Ú is
passed, the reaction of the spring forces down the helve, and the impact of the cutter
preduces a tooth upon the pile-blank.
The action of the feed motion now gives the winding block a slight turn and the
metallic tape draws up the sliding bed the required distance for the next stroke of the
cutter, the operation being repeated until the file or other article is completely cut.
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 is :-
1st. The combination of the various parts constituting the Machine substantially as
described and illustrated in the drawings.
2nd. In Machines for cutting the teeth of files and other like articles, the construc-
tion, and combination of the helve D, cutter holder N, axis I, and adjustable tappit J,
driven by the cam C, for the purpose specified.
3rd. In Machines for the purpose specified, the construction of the feed motion, as
hereinbefore described and shown.
Dated the 30th day of July 1888.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield,
Agent for Applicant.