Improvements in Milling Machines.
Year: 1890

page_text: Date of Application, 14th Jan., 1890-Accepted, 15th Feb., 1890
COMPLETE SPECIFICATION.
[Communicated from abroad by WILLIAM NELSON WOODRUFF, of 26, Hopkins Street,
Hartford, Connecticut, United States of America, Contractor.]
Improvements in Milling Machines.
1, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex, 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 :-
The object of my invention is to provide a milling machine in which the work shall
be firmly supported, and in which the action of the cutter shall be indicated at once
to the workman using the machine.
My invention consists in the combination of a swinging cutter-arm pivoted on the
same center as the driving spindle, and a stop device which limits the extent of the
downward movement of the cutter-arm; it further consists in the combination with
the cutter-spindle, of the work-holding carriage having a compound feed; it further
consists in the combination in a metal working tool of a cutting tool and a work-
holding carriage having a positive or screw-feed and an independent rack feed that
may be used together or individually; and it further consists in the combination of
the several parts making up the machine, and in details of said parts, as more par-
ticularly hereinafter described and pointed out in the claims.
Referring to the drawings:
Figure 1 is a top or plan view of my improved milling machine.
Figure 2 is a view in elevation of said machine.
Figure 3 is a detail end view of the same.
Figure 4 is a detail view, on enlarged scale, in vertical section through the driving
spindle on plane denoted by line a-x of Fig. 1.
Figure 5 is a detail view, on enlarged scale, in vertical section through the cutter
arm and guides on plane denoted by line y-y of Fig. 1.
Figure 6 is a detail view, on enlarged scale, in cross-section of the cutter head on
plane denoted by the broken line 2-z in Fig. 1.
Figure 7 is a detail view, on enlarged scale, in vertical lengthwise section of the
slide feed device.
Figure 8 is a detail bottom, top and end view of the sleeve of the feed device.
Figure 9 is a detail view in elevation of the tool holder.
This
In the accompanying drawings the letter A denotes the standard of the machine,
that is preferably of cast metal made hollow, and thus providing space within the
column for the reception of the cutter-head counterpoise. On the top of this standard
is supported the work-holding carriage B and the swinging cutter-arm ().
cutter-arm is pivoted at the outer end on the driving spindle D that is supported in
bearings in the upper ends of the arms E. E¹ that rise from the bed-plate a that forms
the top of the standard. The outer end of the cutter-arm C is forked so as to provide
space for the pulley c¹ that is keyed to the driving spindle D that passes through the
center of the tubular sleeve F that surrounds this spindle, the forked ends c², c, of the
cutter-arm pivoting on the outer surface of the sleeve and not directly on the driving
spindle D. This sleeve F is in two parts, as shown in Fig. 4 of the drawings, the
pulley c being keyed to the spindle D between two parts of the sleeve that, however,
enclose the shaft in the bearings E¹. The pulley c¹ is arranged in the plane of the
center of the cutter-arm, the other end of which is also forked and supports the
pulley c¹ fast to the cutter-spindle c³, the pulley being also located in the central
plane of the cutter-arm, and in what may be termed the cutter-head, that is broadened
and is adapted to slide vertically between the guide or cheek pieces g that are provided

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with slots g¹ through which a clamping bolt g¹ extends after passing through the
cutter-head. The above described arrangement of the cutter-arm, driving-spindle and
cutter-spindles allows a considerable movement or play of the cutter toward and from
the work without changing the tension on the driving belt, and the cutter-arm is
counter-balanced by means of a weighted lever pivoted within the standard con-
nected by the chain or band h¹ to an arm 11 that extends downward from the cutter-
arm, the belt or band passing over a pulley h³ so that the downward pull of the
weighted lever will counterbalance the weight of the cutter-arm and the mechanism
supported on the cutter-head. On the front edge of one of the guide pieces g is
secured a rack the teeth of which are engaged by the segmental gear & borne on the
inner end of the lever ¹¹ that is mounted on a hub 3 that projects from the side of
the cutter-head. By means of the lever i¹ the cutter-head may be lowered and raised
so as to bring the cutter into contact with the work, or lifted out of contact. An
adjustable stop J is located directly below the cutter-head in position to be encountered
by it in its downward movement, and by this means the extent of downward play of
the head is determined.
The work-holding carriage is supported directly on the bed on the top of the
standard, and is made up of a slide k dovetailed upon the base in the usual manner
and supporting a feed-screw k¹ in the one part, and having a threaded portion passing
through a nut in the slide so as to move the parts supported on the base towards and
from the cutter in line with the spindle. The slide k supports another slide k₁ that is
dovetailed to slide k and has a movement across the slide in the plane of the cutter
and at right angles to the plane of movement of the slide k. This movement of
the slide on slide k is accomplished by means of a peculiar compound feed
device so arranged as to be used as a hand or lever-feed, and also as a screw-feed,
these two forms of feed devices being capable of use separately or in combination.
The details of this feed device are illustrated in Figs. 7 and 8.
The slide k supports the short shaft 7 to which is secured a cog-wheel ¹ and a feed-
lever, the teeth of the wheel meshing into a rack m¹ cut on the under side of the nut m
that slides in a socket that is movable lengthwise along a socket in the upper surface
of the slide k. This constitutes the lever-feed that is one of the two making up what
I have called the compound feed device. The feed-screw n is secured to the carriage k¹¹
in a manner that allows it to be rotated but prevents lengthwise movement, and this
screw extends underneath the slide and through the nut m. By means of the feed-
screw that may be turned by the handle n¹, the carriage is fed back and forth
across the top of the slide k, while by means of the lever " the carriage kl is given
a quicker feed movement in addition to or distinct from the screw-feed. In no
instance, however, in the within described machine tool, is the work-holding carriage
capable of any depthwise movement with relation to the bed of the machine.
When it is desired to use the screw-feed for the carriages the nut may be clamped
firmly to the upper carriage by means of the clamp device k shown in Fig. 2 of the
drawings.
The piece to be operated upon by the machine is clamped in any suitable holder
that is secured to the slide and is preferably adjustable along its upper surface,
being held in the dovetailed groove (see Figs. 1 and 7), and the work of whatever
weight is firmly held while the cutter is moved to and from the work by means of the
feed-lever handle attached to the cutter-head. In this regard the machine sharply
differs from prior milling or slotting machines, as in the latter the cutter is held
against anything but rotary movement while the work is moved towards and from the
cutter, or across its path. One advantage of my improvement in this regard is that
the operation of the cutter or milling tool can be closely watched and gauged by the
operative.
In the operation of the machine the cutter-head may be left free to swing over the
full length of the slots in the guides between which the cutter-head moves, or it may
be secured at any level by means of the clamp device, and in the latter case the
cutter will then make a cut of uniform depth along any piece of work borne on the
carriage or slide.
.

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page_text: said wheel, the feed-screw fitting the threaded socket in the nut and held against
lengthwise movement in the sliding carriage supported on the part bearing the
segmental nut, all substantially as described.
10. In combination with the slide k, the shaft 1 with cog-wheel l' and feed-lever ¹¹,
the nut socket across the face of the slide, the nut m having the rack m², the nut-clamp
appurtenant to the slide, the carriage mounted on slide k, and the feed-screw n
borne on the carriage, and with its threaded end engaging the nut m, all substantially
as described.
Dated this 14th day of January 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.