IMPROVEMENTS IN SLOTTING MACHINES
Year: 1883

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex for an
Invention of IMPROVEMENTS IN SLOTTING MACHINES a communication to
him from abroad by Lucius James Knowles, of Massachusetts, United States
of Amarina
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 2nd February 1883.
HERBERT JOHN HADDAN, of Kensington, Middlesex, " IMPROVEMENTS IN
SLOTTING MACHINES," a communication to me from abroad by Lucius. James.
Knowles, of Massachusetts, United States of America,
This invention relates to machines for forming or cutting the key seats or slots
in the hubs of gears, pulleys, or parts requiring similar slots, cut in the same.
For this purpose I employ a rack formed upon, or fastened to a carriage which
is fitted to slide forward and back in suitable ways when the machine is in
operation. Said ways may be either formed upon, or fastened to the top of the
machine bed.
Upon the forward end of the rack is formed or secured a block to which is
fastened the inner end of an arbor in the following manner.
Said block is provided with a longitudinal slot or opening to receive the end of
the arbor, and with a vertical, threaded opening to receive a holding screw.
The end of the arbor which is inserted in the said longitudinal opening is cut
away upon the sides so. as to form flat bearing surfaces, to prevent said arbor from
turning in said opening. It is held in the block by forming lateral slots in the
top and bottom of the same, and turning the holding screw down into the top slot,
the bottom slot being filled by a projection formed on the block.
The cutter which is provided with sharp cutting saw teeth is rigidly fastened to
the underside of the arbor with the bottom of said cutter converging downwards
slightly from its inner, towards its outer end, for the purpose of gradually cutting
the slot in the part being operated upon, deeper, as said arbor is drawn back
towards the machine by its actuating mechanism hereinbefore described.

page_text: The forward end of the arbor is supported and guided in its movement back and
forth in a correspondingly shaped opening formed in a stud secured to a vertically
arranged plate which is in turn secured to the bed of the machine. Said stud is
provided with a longitudinal slot, to admit of the passage of the cutter, back and
forth.
The part to be operated upon is slipped over the surface of the stud against a
shoulder of said stud, where it is firmly held during the cutting operation, by the
cutter being drawn towards the machine as before described.
The stud may be constructed so as to project at right angles to the supporting
plate, so that a straight longitudinal slot may be cut, or it may be made to project
upon an angle to the plate, eccentric to the arbor to cut a slanting slot in the gear
or other part to be operated upon. In either case the opening and slot formed in
the stud would be concentric with the arbor.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddan in the Great Seal Patent Office on the
2nd August 1883.
"
HERBERT JOHN HADDAN, of Kensington, Middlesex, IMPROVEMENTS IN
SLOTTING MACHINES," a communication to me from abroad by Lucius James
Knowles, of Massachusetts, United States of America,
In
This invention relates to machines for forming or cutting the key seats or slots
in the hubs of gears, pulleys, or parts requiring similar slots, cut in the same.
the accompanying drawings forming a part of this specification, Fig I represents a
side view of the aforesaid improved slotting machine Fig 2 represents a front end
view of the machine shown in Fig I. Figs 3 and 4 represent a top or plan view,
and a front end view respectively of a part of the machine which will be hereafter
more fully explained. Fig 5 represents a vertical transverse section through the
machine taken on lines a b, Figs I and 3 of the drawings. Fig 6. represents upon
an enlarged scale a central vertical section, taken at the point indicated by lines c
Fig 2 of the drawings, and Figs 7, 8, 9, 10, 11 and 12 represent upon the same
enlarged scale as Fig 6. different details and modifications of parts of the machine
which will hereafter be more fully described. This invention consists of forming
or securing an inclined tooth cutter upon one side of a longitudinal shaft or
arbor which is operated back and forth by means of suitable mechanism here-
after described. It also consists in the combination of said toothed arbor with
said actuating mechanism, and in the combination of said arbor and its cutter
with the plate and stud or hub which supports the gear or other part to be
operated upon.
It further consists in the construction and arrangement of
the aforesaid stud in combination with its supporting plate which is secured to the
bed of the machine. To enable those skilled in the art to which this invention
belongs to make and use the same, I will proceed to describe it more in detail. In
the drawings A represents the bed of the machine which is supported on suitable
standards or legs B. The main driving shaft C which is provided with the usual
driving and loose pulleys D, is fitted to turn in suitable bearings E secured to the
under side of bed A. To the opposite end of driving shaft C from pulleys D is
secured a pinion F which engages with a large spur gear G. secured upon the outer
end of a horizontal shaft H which is fitted to turn in suitable bearings I I secured
to the top of bed A. Centrally between said bearing I I upon shaft H is secured
a pinion J which engages with a rack K, and said rack K is formed upon or
fastened to a carriage L which is fitted to slide forward and back in suitable ways
M. M, when the machine is in operation. Said Ways M may be either formed upon
or fastened to the top of bed A. Upon the forward end of rack K is formed or
secured a block N to which is fastened the inner end of arbor O in the following
manner (see Figs and III of the drawings). Said block N is provided with a
longitudinal slot or opening (shown by dotted lines e) to receive the end of arbor O;
and with a vertical threaded opening (shown by dotted lines f) to receive a holding
screw P.
The end of arbor O which is inserted in longitudinal opening e is cut away upon
the sides as represented by full and dotted lines g. so as to form flat bearing
surfaces, to prevent said arbor from turning in said opening. It is held in block N
by forming lateral slots in the top and bottom of the same, as represented by full
and dotted lines h and turning the holding screw P down into the top slot as is
fully represented by dotted lines in Fig 1 on the drawing, the bottom slot being
filled by a projection formed on the block. Figs 8 and 10 represent the construction
of the inner ends of the arbor, Fig 10 being a cross section taken on line xx
Fig 8.
The cutter which is provided with sharp cutting saw teeth i is rigidly fastened
to the under side of arbor O as is represented in Figs 1. 2. 3. and 8 with the bottom
of said cutter converging downwards slightly from its inner towards its outer end,

page_text: for the purpose of gradually cutting the slot in the part being operated upon,
deeper, as said arbor is drawn back towards the machine by its actuating mechanism,
herein before described. The forward end of arbor O is supported and guided in its
movement back and forth in a correspondingly shaped opening R' formed in a stud
R secured to a vertically arranged plate S which is in turn secured at kk to the bed
of the machine. Said stud R is provided with a longitudinal slot R2, to admit of the
passage of the cutter Q back and forth. The part to be operated upon is slipped
over the surface m of stud R against the shoulder n of said stud, where it is firmly
held during the cutting operation, by the cutter being drawn towards the machine
as before described. Stud R may be constructed so as to project at right angles to
plate S when fastened to said plate as represented in Figs 2. 3. 11 and 12 so that a
straight longitudinal slot may be cut, or it may be made to project upon an angle
to the plate, eccentric to arbor O as represented in Figs 1. 6 and 7. as to cut a
slanting slot in the gear or other part to be operated upon.
In either case the
opening and slot formed in the stud would be concentric with arbor O. The form
and slant of stud R may be varied as described for different kinds of work, and the
slant of the cutter Q may also be made so as to cut the slot more or less rapidly.
It will be seen from the foregoing description that a very simple and practical
machine may be produced. The several parts are few as well as strong and durable,
and actual practice has demonstrated the fact that it will perform the work of four
to six men emploving the old methods in vogue.
he Combination in a slotting machine of a horizontal longitudinal arbor O with
an inclined toothed cutter Q, substantially as and for the purpose set forth.
The Combination in a slotting machine of a horizontal longitudinal arbor O
provided with an inclined toothed cutter Q with a slotted stud R, substantially
as and for the purpose set forth.
The Combination with arbor O provided with an inclined toothed cutter Q cut
away on two sides g g, and provided with lateral slots h, h, of block N, holding
screw P, rack K, carriage L, ways M. M, bed A and suitable mechanism for
operating said rack and parts attached thereto back and forth, substantially as
shown and described for the purpose stated.
The Combination with rack K, block N, holding screw P and arbor O provided
with inclined toothed cutter Q, of stud R, plate S and bed A, substantially as
and for the purpose set forth.
The Combination with plate S and arbor O provided with inclined toothed
cutter of stud R having a straight longitudinal opening R¹, and slot R²
through the same, concentric with said arbor O and whose outer surface m and
shoulder n are eccentric and upon an inclined angle to arbor O and plate S,
substantially as and for the purpose set forth.
The Combination with plate S and arbor O provided with inclined toothed
cutter Q, of stud R having a straight longitudinal opening R¹ and slot R2
through the same, concentric with said arbor O and whose outer surface m is at
right angles to plate S and shoulder n at right angles to the stud, substantially
as and for the purpose set forth.
In witness whereof I the said Herbert John Haddan have hereunto set my
hand and seal this 2nd day of August A.D 1883