Improved Machine for Milling, Boring, and like Operations.
Year: 1898

page_text: Date of Application, 9th Apr., 1898-Accepted, 2nd July, 1898
COMPLETE SPECIFICATION.
Improved Machine for Milling, Boring, and like Operations.
I, THOMAS BLEARS, of the Firm of Thomas Blears and Company, of Tomlinson
Street, off Great Jackson Street, Hulme, Manchester, in the County of Lancaster,
Engineers and Tool Makers, 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 relates to an improved machine for milling boring and like
operations and the chief object of my improvements is to adapt a single machine
to effect a greater variety of work than has hitherto been practicable upon such
a machine.
In carrying out my invention I make the main spindle of the machine hollow
throughout its whole length to receive a second spindle fitted and free to slide.
within it on a feather key so that both spindles rotate when the main spindle is
driven and in addition the second spindle can receive a sliding movement. In
order to support the front end of the milling cutter spindle or other tool I employ
a back rest as usual fitted upon a stay or bar carried by the headstock; in
ordinary cases this bar is fixed or fitted to be moved by hand but according to
my invention I cut a thread on the bar and a thread is also cut upon the tail or
rear end of the inner spindle; a nut is fitted upon the spindle and also on the
stay or bar and these nuts are geared together and driven from any suitable part
of the machine.
In the accompanying three sheets of drawings-
Fig. 1 is a side elevation partly in section, Fig. 2 is a plan view with the
headstock removed, and Fig. 3 is an elevation of my improved milling and boring
machine.
In the drawings a designates the bed plate of the machine, 6 the headstock
bolted thereto, can adjustable table or carriage for the work fitted in slide ways
on the bed plate, d the main spindle fitted as usual in bearings on the headstock 6;
this spindle is made hollow throughout to receive a second spindle e fitted and free
to slide on a feather key within it so that both spindles rotate when the spindle d
is driven, and in addition the spindle e can be traversed in either direction by
hand or power.
The nose of each spindle is threaded to receive a chuck or its equivalent for
holding a milling cutter spindle, boring tool or the like, and in order to sup-
port the front end of the spindle on which the tool is mounted, or the front end
of a boring bar I employ a back rest f as usual fitted upon a bar or stay 9 mounted
upon the headstock 6. I cut a thread upon the rear end of this bar g and a corre-
sponding thread is cut upon the rear end of the spindle e and the nuts of the
two are connected together by a train of spur wheels driven in any convenient
manner, for example by an independent shaft h, driven by a belt or chain which
passes over a cone pulley i on the main spindle d and a cone pulley on the shaft
h; on this shaft is secured a worm j in gear with a worm wheel k fixed upon an
upright shaft 7 on which is mounted on a feather key a bevel wheel m which
gears into and drives a bevel wheel n on a stud n¹ for actuating the movements of
a circular table c¹ mounted upon the adjustable table or carriage c.

page_text: There is a pulley or chain wheel o on the shaft h which drives by a belt or
chain a pulley on a stud q on which a swing frame is pivoted and this frame
carries two pinions s either of which can be moved into gear with a spur wheel t
on a shaft t, for the purpose of driving this shaft in either direction; on the
end of this shaft is a spur wheel u which gears into a wheel u¹ secured to a nut v
screwed upon the spindle e and the wheel u¹ gears into a gear ², on a shaft v¹,
on which is a gear w gearing into a wheel w which forms a nut on the bar or
stay g.
On the shaft t is a hand wheel 2 to enable the spindle e and bar g to be
moved by hand power.
On the stud n¹ is fitted a swing frame which carries two pinions ¹, either
of which can be placed into gear with a pinion y secured upon a shaft y', which
by means of gearing can be caused to move the table c¹ either toward or from
the headstock 6 or at right angles to it, or the movements can be made in the
ordinary way by applying a hand wrench to the spindles z.
To raise and lower the carriage c and table c¹ a wrench is used upon a spindle
and suitable means are employed to secure the table c¹ which can be turned
round into any desired position and locked.
It will be obvious that by the automatic movements of the spindles e and
barg supplemented when required by the movements of the table c¹ a variety of
machine work such as milling and boring can be effected in a very convenient
and efficient manner.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is:-
In a machine of the type indicated-
1. Making the main spindle hollow and fitting inside it on a feather key. a
spindle with a screw threaded end so arranged that the two spindles will rotate
together and that the inner spindle can be traversed along the main spindle
substantially as and for the purposes herein set forth.
2. In combination the main hollow spindle, the inner screw threaded spindle,
and a bar or stay for the back rest, said bar having a screw threaded end, and
being connected by a nut and gearing to a nut on the inner spindle, all so
arranged that the bar and spindle can be traversed in either direction and at
the same speed substantially as and for the purposes herein set forth.
3. In combination the main hollow spindle and the inner spindle, the bar or
stay and a table mounted upon an adjustable carriage and capable of being
moved in several directions substantially as herein set forth.
4. The general combination and arrangement of parts constituting my improved
milling and boring machine substantially as herein described with reference to
the accompanying drawings.
Τ
1
H. B. BARLOW & GILLETT,
Agents for Applicant, 17, St. Ann's Square, Manchester.