Improvements in or relating to Milling or Wheel Cutting Appliances for Cutting Bevil or Mitre Wheel Teeth and the like in One Out.
Year: 1895

page_text: Date of Application, 10th May, 1895
Complete Specification Left, 10th Feb., 1856-Accepted, 21st Mar,
1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Milling or Wheel Cutting
Appliances for Cutting Bevil or Mitre Wheel Teeth and the
like in One Out.
We, RICHARD CUNLIFFE of Broughton Iron Works, Manchester, Machinist,
and JAMES TOWERS of 1 Alma Street Collyhurst Road Manchester Driller
do hereby declare the nature of our said invention to be as follows:-
Our improvements have reference to a new or improved form of cutter and
mechanism for operating the same, for cutting tapered grooves, and particularly
mitie oi bevil wheel teeth and the like in milling or wheel cutting machines.
The novel feature of our invention is the forming of the milling cutter in halves,
and mounting it upon a screw thiended spindle in such a manner that as the cutter
travels across the face of the wheel blank in shaping the teeth the cutting faces are
caused to diverge, and cut a path though the metal corresponding to the taper of
groove (or tooth) requned at one cut. The cutter formed in halves as aforesaid is
mounted upon a spindle carrying right and left handed threads and positively
diven by the spindle of the milling or wheel cutting machine. A spur wheel is
fastoned on the end of the aforesaid sorew threaded spindle driving a long pinion
fastened to a sleeve, revolving on a spindle set in a frame or bracket forming part
of the milling or wheel-cutting machine. The long pinion aforesaid drives a spur
wheel fastened on to one half of the divided cutter, and another pinion, also
fastened on to the sleeve aforesaid, drives a spur wheel fastened on the other half
of the cutter.
By varying the number of teeth in the spur wheel which dives the long pinion
and the wheels attached to the two halves of the cutter it will be obvious that as
the cutter operates in performing the work, the two halves will,-by the drag
occasioned by the difference in tecth of the said wheels,-slowly recede from each
other, and so cut a constantly increasing width of groove. If now the carriage
carrying the bevil or mitre wheel blank be caused to travel under the cutter at a
proper rate of speed, it will be found that a tapered groove is thus formed in the
blank, and that any degree of taper may be given to it by altering the speed of the
carriage, or the value of the teeth in the differential combination aforesaid.
The aforesaid sleeve carrying the long pinion is mounted eccentric on its spindle
and is fitted with a short handle, so that when the end of the groove in the wheel
blank is reached, the pinion may be raised and the two half portions of the cutter
brought back again. This operation may be effected automatically by the
movement of the carriage.
The travelling table feeding the work should be positively driven and for this
purpose we employ a tram of change wheel gearing, in lieu of the ordinary belt
driven movement.
The aforesaid arrangement of apparatus may be formed as a special tool for
cutting bevil teeth, or may be applied to existing milling machines, and may also
be used for cutting tapered grooves in a variety of objects other thao nitre an!
bevil wheels.
DL: ol. 11005
RICHARD CUNLIFFE,
JAMES TOWERS,
By Jobu G. Wilson & Co.,
Agents.

page_text: Improvements in or relating to Milling or Wheel Cutting
Appliances for Cutting Bevil or Mitre Wheel Teeth and the
like in One Cut.
We, RICHARD CUNLIFFE of Broughton Iron Works, Manchester, Machinist,
and JAMES TOWERS of 1 Alma Street, Collyhurst Road, Manchester, Driller,
do hereby declare the nature of our said invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement.―
Our improvements have reference to a new or improved form of cutter and
mechanism for operating the same, for cutting tapered grooves, and particularly
mitre or bevil wheel teeth and the like in milling or wheel cutting machines.
And in order that our said invention shall be the more readily understood and
carried into practical effect we have hereunto annexed a sheet of drawings, and we
will now proceed to describe the same with the assistance of the various figures and
letters of reference marked thereon.
On Sheet One, Fig. 1 is a transverse section of our improved groove cutting
appliance, and shewing its application to a wheel cutting machine, and Figs. 2
and 3 illustrate side and edge views of our improved cutter.
On Sheet Two, Fig. 4 illustrates our improved appliance in perspective,
& shewing more clearly its application to the machine.
The novel feature of our invention is the forming of the milling cutter in
halves, (A) and (B), and mounting such halves upon a screw threaded spindle (C)
as illustrated, so that as the cutter travels across the face of the wheel blank in
shaping the teeth the cutting faces are caused to diverge (see Fig. 3), and cut a
path through the metal corresponding to the tape of groove (or tooth) required at
one cut. The diverging movements of the cutter halves 18 caused by right and
left handed screw threads on the aforesaid spindle (C), and by screwed bushes or
sleeves (D) corresponding thei eto, which take into the cutter interior, and on
which the cutter halves are respectively mounted and keyed. The spindle (C) is
positively" driven by the spindle of the milling or wheel cutting machine. A spur
wheel (E) is fastened on the end of the aforesaid screw threaded spindle (C),
diving a long pinion (F), fastened to a sleeve (G), on a spindle (F) in the frame
or bracket (J), attached to, or suspended from, the arm (J) of the machine.
41
The pinion (F) drives a spur wheel (K) fastened on to the bush (D) of the
half (B) of the divided cutter, and another piuton (L) also fastened on to the
sleeve (G) drives a spur wheel (M) fastened on to the bush (D) of the other
half (A) of the cutter.
By varying the number of teeth in the spur wheel (E) and the wheels (K)
and (M) (say these latter having ninety-one teeth and tho former ninety teeth) it
will be obvious that as the cutter operates in performing the work the two
balves (A) and (B) will,--by the drag occasioned by the difference in teeth of the
'said wheels, slowly recede from each other and so cut a constantly increasing
width of groove.
If now the carriage carrying the bevil or mitre wheel blank be caused to travel
under the cutter at a proper rate of speed it will be found that a taperod groove 18
thus formed in the blank, and that any degree of taper may be given to it by
altering the speed of the carriage, or the value of the teeth in the differential
combination of wheels aforesaid.
The spindle (H) carrying the pinion (F) is mounted excentrically with its
bearing (J), and is fitted with a boss aud short handle (I), so that when the end of

page_text: the groove in the wheel blank is reached the pinion (F) may be raised, and the two
half-portions of the cutter brought together again.
The travelling table should be driven positively and for this purpose we employ
a train of change wheels, in lieu of the ordinary belt driven movement.
The aforesaid arrangement of apparatus may be formed as a special tool for
rutting bevil teeth, and may be applied to existing milling machines, and may also
be used for cutting tapered grooves in a variety of objects other than mitre and
bevil wheels.
Having thus particularly described and ascertained the nature of our said invon-
tion and in what manner the same is to be performed, we declare that what
ne claim and desire to secure by Letters Patent is .—
lat. In means or appliances for cutting tapered grooves (or wheel teeth) a divided
cutter, mounted on a rotating right and left handed screw threaded spindle, and
each balf of such cutter driven from said spindle at a differential rate, and thereby
caused to diverge, as set forth.
2nd. The herein described combination and arrangement of divided cutter,
spindle (C), wheels (E), (K) (L) and (M), pinion (F), spindle (H), sleeve (G)
mounted and operating, substantially as, and for the purposes, set forth.
Dated this 8th day of February 1896
RICHARD CUNLIFFE,
JAMES TOWERS,
By John G. Wilson & Co.,
Agents.
RICHARD CUNLIFFE,
JAMES TOWERS,
By John G. Wilson & Co.,
Agents.