Improvements in or relating to Machinery Employed for Slotting, Key-seating, or the like Operations
Year: 1887

page_text: Date of Application, 15th Mar., 1887
Complete Left, 15th Dec., 1887
Complete Accepted, 20th Jan., 1888
PROVISIONAL SPECIFICATION.
Improvements in or relating to Machinery Employed for Slotting,
Key-seating, or the like Operations.
I, GEORGE BENSON, of Stockton-on-Tees, in the County of Durham Engineer, do
hereby declare the nature of this invention to be as follows:-
--
My Invention relates to machinery or apparatus for carrying out the process of
slotting and is especially applicable to slotting key ways in the bosses of wheels,
pullies, or the like articles, through which a hole or recess has already been provided
suitable for accomodating the stroke of the cutter, but, by modifying the design or
arrangement of the machine or apparatus one or more cutters may be operated so as
to apply my invention to slotting machines generally whether the stroke of the cutter
he vertical, horizontal, or otherwise.
The object of my invention is to apply pressure to the cutter during the cutting
stroke and to withdraw this pressure during the return stroke automatically, a further
object of my invention being to provide special facilities for adjusting the article to
be slotted or key-scated in a suitable position to undergo the operation.
In carrying my invention into effect I provide a table or face-plate of the ordinary
kind on which to secure the wheel or other article to be slotted or key-seated; a
reciprocating motion is imparted to the cutter by any suitable means, one stroke being
used as the cutting stroke and the other as the return stroke only; on applying
pressure the cutter slots the article with which it is in contact by means of a series of
teeth on its face or edge which teeth are liable to brake off or be injured if the same
pressure be applied to the cutter during the return stroke, this I avoid by employing
a feed-plate which acts automatically in the following manner :-the feed-plate is
provide behind the cutter so that the loose end thereof is in contact with the back
of the cutter, the other end of the feed-plate works on a hinge or its equivalent secured
in position so that when the cutter moves up and down, as in the case of a machine
designed to slot vertically, the feed-plate which is kept in contact with the cutter by
its own gravity turns up and down with it or otherwise the cutter is compelled to
slide past it; the feed-plate may be secured to the table or face-plate through which
the cutter reciprocates, but, is preferably secured to an adjusting bar provided so as

page_text: to extend over the table or face-plate and to act if required as a guide to the cutter
and as a clamp or hold-fast to the wheel or other article operated upon, the up or
return stroke of the cutter lifts up the feed-plate and so relieves itself of all pressure
whereas the down or cutting stroke of the cutter brings the feed-plate down onto the
table or adjusting bar as the case may be and so causes it to exert pressure sufficient,
to apply the requisite cut, the feed-plate is limited in its downward motion by the bar
to which it is secured and consequently the pressure is applied to the cutter as it slides
past the feed-plate in completing its stroke. By providing in any suitable manner
set screws or studs in the table or face-plate so as to actuate dog jaws or keeps
correspondingly provided in the table or face-plate, clamps and packing pieces can be
dispensed with and the article to be operated upon can be readily adjusted and
secured in position to apply the cutter.
It is of course obvious that the machine can be designed to apply one cutter
vertically as herein before described or can be varied to apply one or more cutters
horizontally or otherwise and if necessary a spring or its equivalent may be attached
to the feed-plate to keep it in contact with the cutter if owing to its position its own
weight is not available for this purpose as in the case of a vertical slotting
machine.
G. J. CLARKSON,
Agent for the said George Benson.
Improvements in or relating to Machinery Employed for Slotting,
Key-seating, or the like Operations.
1. GEORGE BENSON, of Norton Road, Stockton-on-Tees, in the County of Durham,
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 :-
My Invention which relates to machinery or apparatus for carrying out the operation
of slotting is applicable to slotting machines generally in which the cutter bar or
blado is operated with a reciprocating motion, the travel of which corresponds to the
line of cut to be taken and in which the feed is applied to the cutter in one direction
only, but is especially applicable to the class of slotting machines which are constructed
io slot keyways in confined spaces or recesses, such as the holes bored through the
bosses of wheels and pulleys or in other positions in which the adjoining metal would
obstruct the action of any cutter bar or blade which extended from the surface to be
cut in any other direction than that corresponding to the line of travel of the cutter edge.

page_text: In slotting machines constructed on this principle the pressure applied to the
cutter edge during one stroke to put the feed on must be removed therefrom during
the return stroke, otherwise the teeth or cutting edge of the blade or saw is more
liable to injury during the return stroke than during the cutting stroke.
The essential feature of my invention consists of the employment of a device
or combination of parts from which the cutter blade derives the requisite pressure
during the cutting stroke and is relieved therefrom during the return stroke
automatically.
A further object of my invention consists of the means employed for securing in
position on the table or face plate of the slotting machine on which it rests, the wheel,
pulley, or other article to be operated upon, by which wheels or pulleys of any diameter
or other articles of any superficial dimensions within practical limits can be accomodated
on the same table or face plate and can be readily adjusted and secured in position to
be operated upon.
And in order that my invention may be clearly understood and readily carried
into effect I will now proceed to describe the same with reference to the drawings
hereunto annexed in which my invention is illustrated as part of a slotting machine
designed for slotting keyways in wheels, pulleys, or the like articles. Figs. 1 and 2
illustrate in plan and elevation respectively a slotting machine so constructed; Fig. 3
being a vertical section thereof taken on line XX of Fig. 1. Figs. 4 & 5 illustrate
to a larger scale a feed plate fixed in position on a guide bar in accordance with that
part of my invention by which pressure is applied to the cutter and withdrawn
therefrom automatically.
a is the cutter blade or saw to which a reciprocating motion is imparted by means of
the motion bar b, the connecting rod c connected to the rotating disc d, all of which form
a well known combination of parts by which the rotary motion so readily obtained and
distributed in machine shops is converted into the reciprocating motion required in
machines employed for slotting operations. In the machine illustrated in the drawings
the down stroke is the cutting stroke of the cutter, the wheel, pulley, or other article to
be operated upon being placed on the table or face plate e. The feed plate is provided
in the usual position behind the cutter bar a, and is preferably mounted upon a guide
bar to be out of the way, to which it is connected by a hinge or equivalent device
so as to be capable of an up and down motion from position g to position g¹ like a
flap, so that the cutter blade a lifts up the feed plate and relieves itself of all pressure
during the up stroke, but brings it back to its original position during the down or
cutting stroke, by which means the pressure requisite to put the feed on is applied to
the cutter and withdrawn therefrom automatically and by the action of the cutter bar
itself; the guide bar f is capable of sliding on its supports in order to carry the feed
plate forward as the slot deepens, a simple way of offecting this is by the screw h
turned by hand through the fixed support h', a chock fl on the guide bar
the thrust of the screw as clearly illustrated in Figs. 4 and 5.
taking
To render the action of the automatic feed plate reliable it is essential that the free
end thereof should be always in contact with the cutter bar and in machines such as
the one herein before described and illustrated in the annexed drawing, this is effected
by gravity, but should the design of the machine require the feed plate to occupy a
position in which the effect of gravity could not be depended on for this purpose then
any artificial means may be resorted to effect this object, such as a spring or a weight
suspended over a pulley, or other well known equivalent devices. The guide bar f
is supported by the standards & fixed in sockets in the table or face plate e. If these
standards are not adjustable in their positions any wheel, pulley, or other article of
the particular dimensions which would foul the said standards could not be accomodated
on the table or face plate, I obviate this difficulty by providing other sockets for the
reception of the standards so that by moving the standards from one socket to
another the article which fouled them in one position can be made to clear them in
some other position, thus the standards k can be removed from sockets 11 to sockets l'l.
By providing keeps or dog jaws mm² actuated by studs or set screws n n as clearly
illustrated in Fig. 1. for the clamps and packing pieces generally used for securing

page_text: articles to tables, the article to be operated upon can be more readily adjusted and
secured in position to apply the cutter.
The particular combination of parts which constitute the slotting machine herein-
before described and illustrated in the accompanying drawings is not essential to
carrying my invention into effect as each machine may be varied both in general
design and in detail to adapt it to the particular purpose for which it is intended, but
what do claim in machines in which the operation of slotting is effected by a
reciprocating cutting bar cutting in one direction only is:-
Firstly The employment of a feed plate working on a hinge or its equivalent,
the free end of which is in contact with the cutter bar by which pressure is applied
to the said cutter bar during the cutting stroke and is removed therefrom during the
return stroke automatically, substantially as herein before described with reference to
the accompanying drawings.
Secondly-The means provided for removing the standards k from one position to
another to avoid fouling the wheel, pulley, or other article to be operated upon,
substantially as hereinbefore described and illustrated in the accompanying drawings.
Thirdly The employment of adjustable dog jaws or keeps actuated by studs or
sci screws for securing the article to be operated upon in position, substantially as
herein before described with reference to the accompanying drawings.
-
Fourthly The combination in one slotting machine of the means employed for
applying the pressure to the cutter bar and removing the same therefrom automatically
with the means for adjusting the guide bar standards from one position to another and
with the means for securing and adjusting in position the article to be operated upon,
substantially as and for the purpose as hereinbefore described and illustrated in the
accompanying drawings.
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