Year: 1886

page_text: Date of Application, 1st Sept., 1886.
Complete Left, 1st June, 1887.
Complete Accepted, 1st July, 1887.
ади ПКО Uses.
I JAMES TUSHAW of Gray's Inn Chambers, 20 High Holborn London W.C.
Engineer, do hereby declare the nature of this invention to be as follows:-
The device or contrivance according to my Invention comprises a face plate of any
suitable contour to allow of the same fitting in a vice; thus, said face plate may
either be circular or rectangular. The wheel, pulley, or bush, into which a keyway
is to be cut, or other article in which a slot is to be formed, is placed between jaws or
clamping pieces with which said plate is provided, and is retained securely there
between by tightening screws; the plate has attached underneath same a hollow
projection or boss which receives a plunger; said boss has also, depending from it, an
arm or bracket piece the lower end of which forms the fulcrum of a lever which lever
is attached by means of a link or links to the lower end of the plunger aforesaid, and
which latter is free to work vertically in the boss surrounding and enclosing it. The
upper end of said plunger is formed as a cutting tool and thus fulfils the function of
a vertically working cutter bar. Otherwise, the lever aforesaid may be fitted close to
the face plate and inserted through a slot in the cutter bar itself, the fulcrum being
obtained by means of a lug cast on the inner side of the face plate. The lever
extends beyond its fulcrum and works in the long slot of a link which actuates a pawl,
said pawl rotating a ratchet wheel; this latter gives motion to a screw or worm
which draws the boss enclosing the cutter bar in a lateral direction-either to or from
its work-as may be desired. Thus, it will be seen that by the mode or method I adopt
and the means which I employ for putting on the "feed," the latter is rendered self-
acting; whereas in other keyway cutting or slotting machines the "feed" is imparted
to the cutter, as a separate operation, by hand, which involves the exercise of
considerable care and watchfulness; now by my Invention this is dispensed with
and rendered unnecessary at the same time, the regularity with which the "feed" is,
in accordance with my Invention, put on, ensures a perfectly even and clean cut.
The device above described, is designed, primarily, for use as a handy bench tool
or appliance; it may, however, with the ordinary adaptations fitted or connected
thereto, be produced as an independent machine, to be worked by steam or other
power.
Dated this 31st day of Angust 1886
JAMES
STEVENSON,
Gray's Inn Chambers,
20 High Holborn, London, W.C.,
Agent for Applicant.

page_text: COMPLETE SPECIFICATION.
A Novel Tool or Appliance for Cutting or Slotting Keyways
and like Uses.
I, JAMES TUSHAW of Gray's Inn Chambers 20, High Holborn, London, W.C.
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:-
Heretofore in keyway cutting or slotting machines, the "feed" has been imparted
to the cutter as a separate operation, by hand, which involves the exercise of
considerable care and watchfulness on the part of the operator, now, in accordance
with my Invention this is dispensed with and rendered unnecessary, at the same
time the regularity with which the "feed" is put on, ensures a perfectly even and
clean cut.
The device according to my Invention is designed primarily for use as a handy
bench tool or appliance, (and 1 have illustrated said application in the accompanying
sheet of drawings) but it may with the ordinary adaptations fitted or connected
thereto, be used as an independent machine to be worked by steam or other power.
Referring to the accompanying sheet of drawings Figure 1. is a sectional elevation of
the device (taken on line A. B. figure 2). Figure 2. being a plan of the same.
Figure 3. is a side elevational view. Figure 5. is a front elevation thereof and Figure 4.
is a plan of the underpart of the device. Like letters of reference being employed
to denote corresponding parts throughout the several figures.
In carrying out my Invention I employ a face plate A. of circular, rectangular or
other suitable shape, having a projection of such form as to allow of same being easily
fixed to a bench or held by a vice as may be desirable. The under part of the face
plate A is provided with dovetail V. c into which are fitted and free to move backwards
and forwards, the corresponding dovetails d of the upright or hollow socket B. This
latter is formed with two projecting brackets b. between which is fitted a part cog
wheel C. hereinafter termed and referred to as the quadrant wheel (though a complete
cog wheel might be employed) adapted to a spindle D. the extremity of which forms
the fulcrum E of the lever G. The said upright or hollow socket B. receives a
plunger F. having rack teeth Q cut therein of similar pitch to the quadrant wheel C.
On one end of the spindle D, which passes through the brackets b. and to which the
quadrant wheel C. is secured, I adapt a lever G. the motion given to which, is imparted
to the vertical plunger F. by means of the quadrant wheel C. which gears into the
rack Q aforesaid. The said plunger F. is of reduced diameter at its upper end Fl
for the purpose of allowing the same to be used in a much smaller hole than would
otherwise be practicable. The cutter H. is inserted in the slot f. and held in position
by a pin I. The said slot f. being of slightly increased depth relatively to that of
the cutter H to allow the latter having an inward and outward movement in the slot f.
to prevent the cutter H dragging in the up stroke.
The "feed" is rendered self acting by the following arrangement —

page_text: At the upper part of the face plate I provide a spindle K one end of which is
screwed into the sliding socket B, the other end being held in bearings L. adapted to
the face plate A. On the spindle K is secured a ratchet wheel M. at the side of which
is a rocking shaft N having on one end a paul O. which rotates the ratchet wheel M,
the other end of which comes in contact with a pin or stop R. adapted to the under
part of the face plate A the length of which pin is adjustable for the purpose
hereinafter mentioned. Adapted to the face plate A is a spring P which bears against
the paul O. aforesaid serving to keep same in gear with the ratchet wheel M. and to
bring the rocking shaft N into its normal position. After a keyway or slot has been
cut, the paul O. on the ratchet wheel M. is raised or disengaged and the spindle K
is actuated, bringing the socket B and with it the plunger F. to its former position and
ready for feeding again.
The action and working of the machine is as follows
The wheel pulley or bush into which a keyway is to be cut, or other article in which
a slot is to be formed is placed on the face plate A and held in position by means of
bolts and nuts passed through the slots a. of the face plate A aforesaid. It will be
seen on reference to the drawings that the lever G. on being raised to its full height,
comes in contact with the rocking shaft N and actuates the ratchet wheel M to the
extent of one or more teeth as may be determined by the position or length of the
adjustable pin or stop R. aforesaid, secured to the underpart of the face plate A. In
order to bring the cutter again into position I provide a spring J. adapted to the top of
the said vertical plunger F. which spring bears on the head of the cutter H so as to
bring the latter again into its normal position and ready for cutting on its downward
stroke.
Having now particularly described and ascertained the nature of my said Invention,
and in what manner the same is to be performed, I declare that what I claim is:
The novel tool or appliance for cutting or slotting keyways, substantially as herein