An Improved Breast Drill.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
An Improved Breast Drill.
I JOHN HENRY BURY, of The Vulcan Iron Works, Oswaldtwistle, Lancashire,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved breast drill for drilling metals and other
materials and consists in the employment of the usual spindle or rod carrying a
handle and bevel wheel gearing into a bevel pinion rotating on the end of the spindle
and carrying the tool or drill.
For the purpose of securely holding the drill I provide a socket or chuck screwed
on to an extension of the bevel pinion, the said extension being slotted to receive a
pair of spring gripping jaws between which the tool is held tightly upon screwing
up the chuck; and in order to reduce the friction on the thrust bearing of the said
pinion I insert an antifriction steel ball between the end of the spindle or rod,
carrying the gear wheels, and the said thrust bearing.
I prefer to operate my improved drill by means of a crank handle mounted loosely
on the axis of the driving or large bevel wheel the said handle being provided with
a spring pawl gearing into a ratchet wheel formed in one with, or attached to the
outer face of the said driving wheel.
may also form on the inner face of the latter wheel a second or smaller ring of
teeth with which the pinion fitted to the end of the spindle or rod may be caused to
gear by shifting the boss carrying the large wheel by means of a set screw nearer
to the said pinion, thereby increasing the power of the drill.
As my improvements are capable of some modification without departing from
the principle thereof I do not restrict myself to the precise form and placement
of the parts thereof.
Dated his 16th dove of In 1905
J. B. FLEURET,
5, Hatton Garden, London, Agent for the Applicant.
I JOHN HENRY BURY of The Vulcan Iron Works, Oswaldtwistle, Lancashire,
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 :-
My invention relates to an improved breast-drill for drilling metals and other
materials and consists in the employment of the usual spindle or rod carrying a
handle and bevel wheel gearing into a bevel pinion rotating on the end of the spindle
and carrying the tool or drill. For the purpose of securely holding the drill I
provide a socket or chuck screwed on to an extension of the bevel pinion, the said
extension being slotted to receive a pair of spring gripping jaws between which the
D

page_text: tool is held tightly upon screwing up the chuck; and in order to reduce the friction
on the thrust bearing of the said pinion I insert an antifriction steel ball between
the end of the spindle or rod, carrying the gear wheels, and the said thrust bearing.
I prefer to operate my improved drill by means of a crank-handle mounted loosely
on the axis of the driving or large bevel wheel the said handle being provided with 5
a spring pawl gearing into a ratchet wheel formed in one with or attached to the
outer face of the said driving wheel. I may also form on the inner face of the
latter wheel a second or smaller ring of teeth with which the pinion fitted to
the end of the spindle or rod may be caused to gear by shifting the boss carrying
the large wheel by means of a set screw nearer to the said pinion, thereby
increasing the power of the drill.
And in order to clearly understand my said invention I will describe the same
with reference to the accompanying sheet of drawings in which Figure 1 is
an elevation of a breast-drill and Figure 2 is a section at right 'angles thereto.
a is the spindle or rod to which is secured the handle b by means of the screw b
and c is the bevel or driving wheel mounted loosely on the extension 62 of the boss
of the handle b. The wheel c gears into the bevel pinion & the latter being formed
with an extension d' to which the socket or chuck e for holding the tool, is screwed.
This extension is slotted at 2 for receiving the spring gripping jaws f between
which the drill or tool is tightly held upon screwing up the socket or chuck e. ..9
is
an antifriction ball placed between the end of the spindle a and the thrust bearing
of the pinion d. The drill is driven by means of the handle mounted loosely
upon the hollow axis or bearing of the wheel c, and to which is pivoted
the spring pawl i gearing with the teeth of a ratchet wheel k formed on the outer
face of the driving wheel c. The inner face of the wheel c is formed with a second
or smaller ring of teeth 2 for the purpose of reducing the speed or increasing the
power of the drill.
a
This is accomplished by unscrewing the set-screw b' and shifting the spindle
upwards. The pinion d is then at liberty to be likewise raised into gear with the
ring of teeth c2 whereupon the set-screw is tightened up and the tool is ready
for use.
The drill may be operated either continuously or intermittently. In the former
case a screw connects the driving wheel c with the handle the latter thus
carrying the wheel round with it and causing the wheel to revolve continuously as
long as the handle is operated. For causing an intermittent action the screw 1 is
removed thus freeing the handle from the wheel and driving the latter by means of
the spring pawli and ratchet wheel & as in an ordinary ratchet brace.
The drill or tool may be easily removed and replaced by a new one, by unscrewing
the chuck or socket e thus allowing the tool to be removed and another to be placed
in position between the spring-jaws f which are caused to grip the tool by screwing
the chuck or socket e on to the extension d' of the pinion das herein before
described.
Having now particularly described and ascertained the nature of my said inven-
tion I declare that what I claim is ;-
1. In an improved breast-drill the combination of the spindle a and the handle b
carrying the driving wheel e gearing with the pinion d the latter being provided
with an extension di formed with a slot d2 for receiving the spring grippers f
between which the tool is tightly held upon screwing up the chuck or socket e
substantially as described and for the purposes specified.
2. In an improved breast-drill the combination of the spindle a, the handle
formed with an extension 62 the screw the wheel e provided with a hollow axis
or bearing cand an inner ring of tecth 2, the pinion d forthed with an extension d
having a slot 2, the chuck or socket e, spring grippers f f antifriction "bally.
handle, spring pawl i, ratchet wheel k and screw, all arranged and operating
substantially as described and for the purposes specified.

page_text: 3. The improved breast-drill substantially as described and shown in the
accompanying sheet of drawings.
Dated this 16th day of October 1895.
J. B. FLEURET,
5 Hatton Garden, London, Agent for the Applicant.