Improved Apparatus to be employed in the Drilling or Boring of Metallic or other Bodies.
Year: 1893

page_text: Date of Application, 2nd May, 1893-Accepted, 2nd June, 1893
OMPLETE DIECIFICATION.
Improved Apparatus to be employed in the Drilling or Boring of
Metallic or other Bodies.
.
We, JOHN WHITEHALL and GEORGE BEDFORD Junior, trading as Whitehall.
and Bedford, of Whitehouse Street, Aston, Engineers, 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 invention consists of the improved apparatus herein after described for the
drilling or boring of metallic or other bodies, such as the fittings or parts used in
the cycle trade, or fittings or parts used in the gun trade, also applicable to other
work light or heavy.
(
The aim and object of our invention being simplicity in construction and
expeditious in its employment.
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We will describe our invention as follows:-
We provide a short lathe bed and on it mount two headstocks, each of which
carries a revolving spindle, to one end of which is attached a drill. The headstocks,
are so placed on the lathe-bed that the drills are adjacent to each other over the
centre of the lathe-bed longitudinally. The mechanism in connection with each.
headstock is similar except that it is "right and left." We will describe it as in:
connection with one headstock. The spindle which carries the drill revolves in
bearings on the headstock like an ordinary lathe spindle, but it is also capable of
motion to a certain defined extent end ways in the bearings.
:
. On the spindle is secured a band pulley by which rotation is given to it. At the.
other end of the spindle, that is the end farthest from the drill is a round smooth;
knob, concentric with the drill spindle, and beyond the spindle a flat disc cam
rotates at a speed much slower than that of the drill spindle. On the face of the
cam next to the headstock, one or more inclines are formed, at the end of each
incline the metal is cut abruptly away to the base of the next. The cam is placed
so that its inclines press against the knob on the outer end of the drill-spindle.
When the cam revolves in the proper direction the incline pushes against the end
of the drill-spindle and causes it to move endways in its bearings, the while it is
revolving thus giving the "feed motion," to the drill. As soon as the highest
part of the incline has in its rotation passed the knob on the end of the spindle the
abruptly cut away part allows the drill spindle to be brought quickly back to its
original position by the action of a helical spring which is mounted upon the drill
spindle between the pulley and the inner bearing, or by some equivalent mechanical
device. Owing to the continued revolution of the cam the drill again alternately
advances or "feeds" slowly and retreats quickly.
The action of the mechanism at the other headstock is similar.
.
By having the two drill spindles set laterally a determined distance apart, we
can drill two holes in a piece of metal held between the drills, one hole being
drilled from the one side, and the other from the other side simultaneously.
We give the rotary motion to the cams by means of a band pulley on the axis of
which is a worm gearing into a worm wheel on the common axis of the two cams.
A counter-shaft overhead is provided with pulleys which drive by means of bands,
pulleys on the drill spindles, and that actuating the cam.
It will be seen that the rate and depth of the feed, and the withdrawal of the
drills, are all effected automatically.
We hold the object which is being drilled by means of a hinged clamp-bar which
shuts down upon the object which is laid in a recess formed in the upper part of a
block fixed on the bed of the machine. The hinged clamp bar is then secured by
a screw in the end of a hinged link which swings over. it.

page_text: And in order that this our said invention may be more fully understood, we shall
now proceed more particularly to describe the same, and for that purpose we shall
refer to the several figures, on the sheet of drawings hereunto annexed, the same
letters of reference indicating corresponding parts throughout all the figures.
Fig. 1 is a front view.in) elevation shewing our " Improved apparatus to be 5
employed in the drilling or boring of metallic or other bodies."
Fig. 2 is a plán view of same.
S
Fig. 3 is a view in elevation partly sectional taken at the line.A, B, shewing
hinged clamp bar and parts not shewn in Figs. 1 and 2.
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a is a short lathe bed supported by the framing b, c, c, are. the headstocks 10
carrying the revolving spindles 'd, d, and e, e, are the drills, connected, to same the
position of which is shewn in Fig. 2. The spindles d d are supported and revolve"
in bearings at ffff, of c, c, the headstocks. It will be perceived by Figs. 1
and 2 that d d to a certain extent will move end ways, that is to say, advance and
recede, and 'by this mode, the drilling or boring is effected: g, g, are band pulleys 15
upon d, d, and by means of which motion is imparted to e, e. h; h, are the knobs
having a common centre with d, d. i, i, are disc cams, upon the axis or shaft j,
driven by the band pulley k, these cams in their rotation move at a slower speed of
than the spindles d, d, with the drills e, e. The inner face of these cams, that is
the face next the headstocks c, c, are formed with inclines 1, 1, cut abruptly from 20
one to the next!
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The cams, i, are so arranged that the said inclines 1, 1, press against h, h,
upon d, d, and when moving in the proper direction engages against h, h, upon d, d, či
moving them endways in the bearings f, f, f, f, and during its revolution givesithe
"feed-motion" to the drills e, e, and so effect the purpose, but when the highest 25
parts of 1, 1, in their rotation has passed the knobs h, h, the abruptly cut part of
the incline permits the drills e, e, on their spindles d, d, to be brought back to their
original position, and this is effected by the power of the helical springs mm, Os
mounted upon d, d, and causing a compression from g, a to ƒ, lớp
1)
By the continued revolution of i, i, the cams; the drills e, e, again alternatively! 30
advance slowly feeding, and quickly retreating.
I
The rotatory motion is given to the cams i, upon the axis j, by means of the
band pulley k, the said axis being provided with the worm n, which gears with thei
worm wheel o, on the axis j, which carry i, i.
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The pulleys g, g, and k are driven by band pulleys on anfoverhead countershaft. 35
The rate and depth of the feed, and the withdrawal of e, e, is effected>
automatically.
f.
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In Fig. 3 we shew the means employed for the holding of the article or part to E
be drilled or bored which is first placed upon or in a recess formed in the upper
part of the block p, which is fixed to the bed a, (y, is the blank or part of a cycle 40
chain so held) is the hinged clamp-bar; which is brought down by means of its
joint and secured by the screw t, in the link, which is provided with an
aperture for passing over r.
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The spindles d, d, with drills e, e, being set laterally a distance apart, as may be
required, we can drill two holes in a piece of metal, or other material, when fixed 45
between the drills, one hole being drilled from the one side, and the other from the
other side simultaneously.
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The above being our said invention, we wish it to be observed in conclusion that
we do not limit ourselves to the precise details or arrangement of parts as shewn
on the accompanying sheet of drawings, but that we may alter or modify the same 50
without departing essentially from the principle of our said invention.
1.
4
'Having now particularly described and ascertained the nature of our said CA
invention, and in what manner the same is to be performed, we declare that what
we claim is
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volst. The improved apparatus to be employed in the drilling or boring of metallic 55
or other bodies, (that is to say) constructing two headstocks, mounted on a lathe

page_text: bed, which carry two revolving spindles, in bearings, each spindle carrying a drill,
adjacent to each other at the one end, the other ends having two knobs, each
spindle having a defined motion or movement end ways, actuated, substantially as
herein before set forth and described.
2nd. Constructing and employing two cams, one at each end of a revolving shaft,
said cams being provided with inclines on their face which in their rotation engage
with the knobs on the spindle, thereby giving the feed motion to the drills, actuated,
substantially as herein before set forth and described.
3rd. Constructing and employing the hinged clamp-bar in connection with the
hinged link, and the screw for holding the object, being operated upon, substantially
as herein before set forth and described.
4th. The general combination and arrangement of parts substantially as herein
before described in the foregoing Specification, and shewn on the accompanying
sheet of drawings.
THOS. KENDRICK,
Agent.