Improvements in Apparatus for Cutting Key-ways and like Operations.
Year: 1888

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting Key-ways and like
Operations.
I, JOHN DICKINSON, of Devonshire Iron Works, Keighley, in the County of York,
Machine Tool Maker, do hereby declare the nature of this invention to be as
follows:-
:-
This invention relates to certain improvements in slotting apparatus having a
reciprocating motion such as are used for the purpose of cutting or slotting key-
ways or grooves through the holes bored in the bosses of wheels and the like, in
which the space for the operation of the cutting tool is limited; and has for its
object, the combination of certain parts of the apparatus in a novel manner, by which
the construction is simplified, and a slow motion obtained for the cutting instrument
during its forward or cutting portion of the stroke, and a quick return or backward
movement of the same; also to so arrange the cutting instrument and support,
that pressure is automatically applied to the former during the forward portion of
the stroke or traverse, and removed on its return; which 1 accomplish in the
following manner:
On a suitable gauntry is mounted a sliding saddle which may be operated in the
direction for cutting by a rotating screw, rack and pinion or other equivalent
means; and in the other or non-cutting direction by a weight, on the automatic
release of the screw nut or other operating connection with the prime mover of the
apparatus.
To the before mentioned saddle is attached in a suitable manner the cutting
instrument, which is a bar of some length, made taper in one direction, with one
edge serrated and the other plain. This bar is made to slide through a groove cut in
a supporting mandril mounted in the head stock; against which or to an attachment
thereto may be secured a wheel or other part of a machine to be slotted or grooved,

page_text: and in such a manner that, on the forward or cutting portion of the stroke, the
serrated edge of the taper bar on coming in contact with the metal, will cut a groove
in the wheel or the like to a predetermined depth; the cutting bar being guided and
supported by the before mentioned mandril, and by the bar being taper, 'cuits the
groove gradually deeper as it proceeds, each portion of the cutting instrument
removing or cutting about the same depth of metal and by the groove being formed
or cut by a bar as described; on the return stroke of the same, the pressure on the
cutting edge is removed, thereby preserving the said edge from injury during the
return stroke.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Cutting Key-ways and like
Operations.
I JOHN DICKINSON of the firm of John Dickinson and Company of Keighley in
the County of York, Engine and Machine Tool Makers, 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 :-
That is to say it relates to improvements in mechanisms, well known as slotting-
machines, the same being used for the purpose of cutting key-ways or grooves in
the bosses of wheels and like articles wherein the space for the operations of the
cutting-tool is limited; and it has for its object the production of a machine that
shall be simple in its construction yet more efficient in its operation than those
heretofore employed. This 1 attain by imparting a slow motion to the cutting-tool
during the forward or cutting portion of its stroke, while it has a quick return or
backward movement, the cutting-tool being automatically kept in proper contact
with the article or part it is cutting during the said forward movement and released
when performing the backward movement.
Such being the object and nature of my said invention, in order that same inay
be more readily understood I have hereunto appended sheets of drawings illustrative
thereof to which by figures and letters reference is made in the following description.
Fig. 1 is a side view of the machine constructed according to my said invention.
Fig. 2 is a top view of fig. 1. Fig. 3 is an end elevation of fig. I while fig. 4 is a
sectional end elevation enlarged scale of a portion of the machine.
Figs. 5, 6 and 7 are detail drawings of parts in section hereinafter described.
Similar letters of reference indicate similar parts throughout the several views.
The saddle a is mounted so as to slide upon the gauntry band bas coupled to it
(said saddle a) the weight c by means of the chain d operating over and in connection
with the wheel e, the arrangement of this said weighting mechanism being such as
always to draw the saddle a in the direction of the arrow when said saddle a is
free to move in that said direction.
Mounted so as to operate in a suitable manner within the hollow part of the
gauntry is a screw g to which continuously rotary motion is imparted from any
suitable motor through the pulley hand gearing wheels k k as will be well
understood.
Within the saddle a is made to fit loosely the plug l, the lower end of which is
so formed that it will gear with the screw g, above described, whenever desired.
This plug is arranged to be operated by the lever m which has its fulcrum at m¹
and is joined by the link n to the handle-lever o, so that when this handle-lever o is
manually pressed downwards the plug is made to engage with the screw 9 and
when said handle-lever o is liberated, by the actions of the weight m' and the
spring p (said spring p, being within a cavity in the part a' of the saddle a, is shewn

page_text: n broken lines fig. 4), it is raised and so disengages the prog
however in order to hold said plug in gear with its scrow gas long as may be
desired, the catch is mounted in such a manner as to lay hold of the lever m
(see fig. 1A.). This catch has a tail-piece formed upon it so that it may be
disengaged by being brought in contact with the stop-piece s as the saddle a is 5
being moved by the screw y, hence the disengagement of the plug is automatically
performed and its place or time of disengagement may be predetermined since the
stop-piece s is made so that it may be attached at any part along the slot in the
gauntry b.
The cutting-tool t consists of a suitably shaped bar of metal having teeth t¹ formed 1
on one of its edges, the same being made to extend up each side thereof as shown.
These teeth are made of the desired form and are arranged to be an appropriate
distance apart so that the amount of substance cut by cach tooth during its cutting
operations may have space or room within these interstices as shewn by figs. 5, 6
and 7.
Again the part of the cutting-tool t whereon the teeth t¹ are formed is made taper,
or in other words is so formed that an imaginary line drawn touching the tips or
outer points of each of the teeth t' would be at an appropriate angle to the back
edge of said tool t.
The cutting-tool t is mounted to slide within a groove u formed in the mandril or
supporting-and-guide-piece u', and is attached to the adjustable bracket by the
screws. This bracket is formed so that it may be fixed at any part along
groove made in the part a² of the saddle a.
the
From the foregoing description it will be seen that when the handle-lever o is
operated so as to put the plug into gear with the continuously rotating screw g
the saddle a will be moved in a direction opposite to that indicated by the arrow f
Now provided that an article w which was to be
so also will the cutting-tool t.
slotted or cut had to be mounted upon the mandril u¹ as shewn by fig. 5, when the
cutting-tool t commenced to move from the normal position to which it had been
drawn by the weight c, the teeth t¹ on its narrowest part t would be kept in contact
with the article w by the compact of the back edge of the tool t and the top of the
groove u in the mandril 4, so also would the succeeding teeth as the tool t continued
its motion and by the time that the stop-pieces was reached a groove would be
cut in the article w of the depth equal to the difference in the width of the par
of the cutting-tool t that first commenced to cut and the part that did lastly so cu
as will be readily understood. On the return movement of the saddle a the cutting
tool will be relieved of the compact with the mandril u in contradistinction to th
cause of said compact by the movement in the opposite direction.
When a taper groove, or one that is deeper at one end than the other, is desired t
be cut a mandril a having the part 2 (upon which the article to be cut is mounted
at an appropriate angle to the part u as shown by fig. 6, is made use of. Or instea
of said part 2 being formed as above described it may be made of taper form
u² vr 713 up
shewn by fig. 7. In either case, whether the part u² or u³ is made use of, the surfa
of the shoulder part is made at right angles to the surface of the part
which the article to be cut, rests, by which means said article is more securely a
firmly held in position during the operation of cutting.
It will readily be understood that instead of making use of the screw g with
gearing wheels kk and pulley any other suitable arrangement of parts may
employed for effecting the movements of the saddle a such as the well kno
arrangement of rack and pinion mechanism, etc., without departing from the nature
this invention.
Having now particularly described and ascertained the nature of my said inv
be performed, I declare that wha
tion, and in what manner the same is to
claim is:
1. The cutter t formed as described and having teeth t', the mandril u' havin
eparate within, and means for operating said cutter

page_text: combination, the same being constructed and arranged to operate in the manner and
for the purpose substantially as specified.
2. The cutter t constructed as described, the mandril u having a groove u, the
adjustable bracket the saddle a, lever m mounted on said saddle a and weighted as
set forth, the plug 7 formed to engage with the screw g, catch r, stop piece 8,
gauntry b, the weight c, the chain d and the pulley e in combination, the same being
formed and arranged to operate substantially as herein specified.
3. The cutter t formed as described, means for operating said cutter t, and the
mandril having its part 2 and surface a formed as set forth, in combination as and
for the purposes substantially as specified.
4. The cutter formed as described, means for operating said cutter t, and the
mandril having its part formed as set forth, in combination as and for the
purposes substantially as specified.