Year: 1895

page_text: Date of Application, 15th June. 1895
Complete Specification Left, 15th Apr., 1896-Accepted, 30th May, 1896
I, WILLIAM WILSON HULSE of the Ordsal Works, Salford, Manchester, in the
County of Lancaster, Engineer do hereby declare the nature of this invention to
be as follows:-
This invention has reference to improvements in machinery for milling and boring
metals; it is applicable to machines having either vertical or horizontal tool
spindles and has for object to enable the speed of rotation of said spindles to be
varied according to the requirements of the work to be done with or without
altering the speed of the driving belt.
For this purpose, in the case of a machine the tool spindle of which is arranged
horizontally there is mounted upon a vertical shaft so as to rotate therewith two
or more worms that are capable of lengthwise movement thereon; and to the upper
end of the said shaft is secured a belt pulley driven from a horizontal shaft at the
foot of the machine by a belt passing over guide pulleys that may be adjustable
for the purpose of imparting tension to the driving belt. The said worms can
respectively be placed in gear with a change worm wheel which corresponds in
number of teeth to the speed of rotation required; these worm wheels, which may
be carried by a bracket on the cross slide of the machine being arranged to drive
the milling spindle, the outer end of which is adapted to slide through them but is
connected to them by a key sliding in a key-way or by other suitable means.
For the purpose of moving the worm wheels and worms into and out of gear,
racks and pinions, screws or other convenient arrangements may be adopted. In
some cases I form the worm wheels side by side upon a boss the outer bearing
portion of which is of the same diameter as one or both of the worm wheels, by
which arrangement the bearing bracket and the sliding connection between the
worm wheels and the milling spindle are brought close to the vertical worm shaft
and undue overhanging or projection avoided.
In applying my improvements to machines in which the tool spindles are
arranged vertically, the worms are mounted upon a horizontal shaft carried in
brackets extending upward from the cross slide and driven by a belt as herein-
before described, but the guide pulleys are to be specially arranged to suit the
altered position of the worm shaft. The worm wheels are carried by the spindle
carriage and the spindle slides through them but is connected to them by a key
sliding in a keyway or other suitable means. The vertical adjustment of the
spindle may be effected by a screw. By adjusting the guide pulleys carried by
the standards of the machine which adjustment is preferably effected by means of
longitudinally fixed screws working in threaded holes in sliding pulley brackets, a
suitable degree of tension can be imparted to the belt irrespective of the position
of the cross-slide. In milling and boring machines according to this invention
two or more spindle carriages may be employed, each spindle being driven in the
manner above described.
I may, in some cases, place the horizontal worm shaft of a vertical milling
machine at or towards the upper part of the frame of the machine, the worm wheels

page_text: being keyed on the spindle and being movable vertically for the purpose of being
engaged with and disengaged from their respective worms.
Dated this 15th day of June 1895.
improvements in Machinery for Milling and Boring Metals.
1, WILLIAM WILSON HULSE, of the Ordsal Works, Salford, Manchester, in
the County of Lancaster, 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 :-
This invention has reference to improvements in machinery for milling and
boring metals; it is applicable to machines having either vertical or horizontal
tool spindles, and it has for object to enable the speed of rotation of said spindles
to be varied according to the requirements of the work to be done, with or without
altering the speed of the driving belt.
For this purpose, in the case of a machine the tool spindle of which is arranged
horizontally there is mounted upon a vertical shaft so as to rotate therewith two or
more worms that are capable of lengthwise movement thereon; and to the upper
end of the said shaft is secured a belt pulley driven from a horizontal shaft at the
foot of the machine by a belt passing over guide pulleys that may be adjustable
for the purpose of imparting tension to the driving belt. The said worms can
respectively be placed in gear with one or other of two change worm wheels
which corresponds in number of teeth to the speed of rotation required, these
worm wheels, which may be carried by a bracket on the cross slide of the machine,
being arranged to drive the milling spindle, the outer end of which is adapted to
slide through them but is connected to them by a key sliding in a key-way or by
other suitable means.
For the purpose of moving the worm wheels and worms into and out of gear,
racks and pinions, screws, or other convenient arrangements may be adopted.
Referring to the accompanying drawings, Figs. 1, 2 and 3 illustrate by way of
example in front elevation, side elevation and plan respectively, so much of a
milling and boring machine having a horizontal tool spindle as is necessary to
illustrate the application of my invention thereto. Fig. 4 is a detail view.
1 is a horizontal milling spindle carried in a spindle carriage or headstock 2 that
is horizontally adjustable along a counterbalanced cross slide 3 carried by and
vertically adjustable upon standards 4 secured to the bed of the machine. The
right hand end of the spindle 1 may be supported by a following centre (not
shown) carried by a bracket which is adjustable along the headstock 2. 5 is the
work table which can be traversed to and fro along guides on the bed by any
suitable means as well understood. The outer end of the milling spindle 1
extends through a sleeve 6 to which it is connected by a key sliding in a key-way.
This sleeve is carried by a bracket 7 on the cross slide 3, and has fixed upon it two
worm wheels 8, 8ª. It is arranged to be moved end wise by means of a pinion 9
that is carried by the bracket 7 and is fixed on a spindle 9* by which it can be
rotated, and gears with a rack 9" which is arranged in a horizontal groove in an
outer sleeve 6* and is held between the boss of the worm wheel 8 and a collar 10
upon the sleeve 6. 12 is a vertical shaft mounted in bearings in brackets 13
carried by one of the standards 4 and having secured to its upper end a belt
pulley 14 driven from a horizontal shaft 15 by a belt 16 passing over guide

page_text: pulleys 17. The shaft 12 extends through a sleeve 18 (Figs. 1 and 4) which is
connected to it by a feather and groove connection and is mounted in a bearing 19.
on the cross slide 3. The sleeve 18 can be moved end wise through the bearing 19
by means of a pinion 21 and rack 21ª similarly arranged to the pinion 9 and
rack 9. Fixed upon the sleeve 18 are two worms 22 and 22 one of which, viz. 22,
can be placed by means of the racks and pinions in gear with the change worm
wheel and the other of which, viz. 22, can be similarly placed in gear with the
change worm wheel 8 according to the speed of rotation it is required to impart.
to the spindle. For obtaining the different speeds, each worm 22, 22ª may have a
single thread in which case the worms 8, 8" will have different numbers of teeth ;
or the worm wheels may have the same number of teeth, one of the worms having
a single thread and the other a double thread. The shaft 12 is supported in an
intermediate bearing 19ª at a point just below the worm 22" when this is in its
lowest position.
In some cases I form the worm wheels 8, 8" side by side upon a boss provided
with a sleeve the outer bearing portion of which is of the same diameter as one or
both of the worm wheels, by which arrangement the bearing bracket 7 and the
sliding connection between the worm wheels and the milling spindle 1 are brought
much closer to the vertical worm shaft and undue overhanging or projection
avoided. Such a construction is illustrated in Fig. 5 where the worm wheels 8
and 8* are formed upon a boss 8 provided with a loose sleeve 8° held longitudinally
between the worm wheel 8 and a collar 10 on the boss 8b and the outer circum-
ference of which is of approximately the same diameter as the wheels. The whole
is carried in the bearing bracket 7 and is adapted to be moved endways by means
of a rack 9 held in the sleeve and a pinion 9, as in the arrangement hereinbefore
described.
In applying my improvements to machines in which the tool spindles are
arranged vertically, the worms are mounted upon a horizontal shaft carried in
brackets extending upward from the cross slide and driven by a belt as herein-
before described, but the guide pulleys are to be specially arranged to suit the
altered position of the worm shaft. The worm wheels are carried by the spindle
carriage and the spindle slides through them but is connected to them by a key
sliding in a keyway or by other suitable means. The vertical adjustment of the
spindle may be effected by a screw. By adjusting the guide pulleys carried by
the standards of the machine, which adjustment is preferably effected by means of
longitudinally fixed screws working in threaded holes in sliding pulley brackets, a
suitable degree of tension can be imparted to the belt irrespective of the position
of the cross slide. In milling and boring machines according to this invention,.
two or more spindle carriages may be employed, each spindle being driven in the
manner above described.
Figs. 6 and 7 are front and side elevations respectively showing my invention
applied to a milling or boring machine having two vertical milling spindles. Each.
milling spindle 1 is mounted to rotate in a headstock 2 that is movable along the
cross slide 3 independently of the other headstock. Each headstock has formed in
one with or secured to its upper part a standard 23 that carries the vertically
adjusting or feed screw 24 for the corresponding milling spindle and is provided
with a bracket 7 in which is mounted the boss 8b and sleeve 8 of a pair of worm.
wheels 8 and 8 that are similar to and are adjusted endways in a like manner to
those shown in Fig. 5. The worms 22 and 22ª for each milling spindle 1, are fixed
or formed upon a sleeve 18, the two sleeves being each connected by a sliding
feather and groove connection to a horizontal worm shaft 12 carried in brackets 13.
extending upward from the cross slide 3. Each sleeve is mounted in a bearing 23ª
formed on the standard 23, and is provided with a pinion and rack 21 and 21ª
respectively for moving it endwise for the purpose of bringing either worm 22 22*
thereon into proper working position relatively to the worm wheels 8, 8ª.
The worm shaft 12 is provided with a belt pulley 14 driven from a lower
horizontal shaft 15 by a belt 16 passing over guide pulleys 17, 17 one of which is

page_text: carried by a sliding pulley bracket 17" that can be adjusted by means of a
longitudinally fixed screw 17" working through a screw threaded bole in the
extension 17 of the bracket for the purpose of imparting the required tension to
the belt; 17 is a hand wheel for rotating the screw 17.
I may, in some cases, place the horizontal worm shaft of a vertical milling
machine at or towards the upper part of the frame of the machine, the worm
wheels being keyed by a key sliding in a key way, on the milling spindle and being
movable vertically for the purpose of being engaged with and disengaged from
their respective worms.
Fig. 8 illustrates in side elevation the upper part of a milling and boring machine
in which the shaft 12 with the adjustable worms thereon is carried on the upper
part of the frame of the machine, instead of on the cross slide, as in the arrange-
ment shown in Figs. 6 and 7 and the worm wheels 8 and 8* are mounted by their
boss 9 in an overhanging bracket 7 bolted to the top of the framing. By
arranging the bracket 7 above the shaft 12, the worm wheels 8,8ª may extend
below it instead of above it as shown.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. In a milling or boring machine, the combination with the tool spindle of a
suitably driven worm shaft provided with two or more worms arranged to rotate
therewith but capable of moving longitudinally thereon, a like number of
longitudinally movable worm wheels connected to the tool spindle and means
whereby the said worms can respectively be placed in gear with the change worm
wheel which corresponds to the speed of rotation required, substantially as
described.
2. The improvements in machinery for milling and boring metals substantially
as hereinbefore described with reference to and shown in Figs. 1 to 4 inclusive ;
in Fig. 5; in Figs. 6 and 7; and in Fig. 8 of the accompanying illustrative
drawings
Dated this 15th day of April 1890.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.