Improvements in Rotary Hand Drilling Machines for Mining and other Purposes.
Year: 1896

page_text: Date of Application, 24th Jan., 1896
Complete Specification Left, 23rd Oct., 1896-Accepted, 16th Jan., 1897
PROVISIONAL SPECIFICATION.
Improvements in Rotary Hand Drilling Machines for Mining and
other Purposes.
JOHN THOMAS BLACKETT, Engineer, Ivy House, Guisborough, Yorkshire and
WILLIAM HUTTON, Alton House, Guisborough, Yorks, Engineer do hereby
declare the nature of this invention to be as follows:-
Our invention relates to a rotary hand drilling machine for drilling holes in coal,
ironstone and the like. The object of our invention or improvement is to increase
the durability of such machines by using differential bevil gear for giving the
necessary feed and having a screw bar with a very coarse pitch for rapid withdrawl.
Our invention or improvement consists as follows-
On the screw bar which holds and drives the drill we form a sleeve in the inside
of which a key or feather is fixed which fits into a groove in the screw bar for the
purpose of driving the screw bar, on the outside of the sleeve is fixed a bevil wheel
and operated upon by another bevil wheel fixed at right angles to the screw bar and
to the said bevil wheel a handle is fixed for the purpose of turning the screw bar in
the required direction.
On the screw bar there is also a nut screwed in the inside to fit screw bar, upon
the outside of the nut is fixed a bevil wheel operated upon by another bevil wheel
fixed at right angles to the screw bar and on the same spindle as the wheel that
drives the bevil wheel on the sleeve.
It will be seen by the foregoing that the screw bar and the nut both revolve in
the same direction, therefore to give the necessary forward motion to the screw bar
the bevil wheel on the nut must be slightly larger than the bevil wheel on the
sleeve so as to allow the screw bar to revolve a little quicker than the nut,
therefore the screw bar must screw through the nut and give the required feed.
To obtain rapid withdrawl the two bevil wheels are disconnected, so that upon
turning the handle the only wheel that revolves is the one upon the nut which
therefore brings the screw bar back at the full pitch of the screw.
Dated this 23rd day of January 1896
JOHN THOMAS BLACKETT.
WILLIAM HUTTON.
Improvements in Rotary Hand Drilling Machines for Mining and
other Purposes.
JOHN THOMAS BLACKETT, Engineer, Ivy House, Guisborough, Yorks, and
WILLIAM HUTTON, Alton House, Guisborough Yorks, also 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 :-
Our invention, relates to a rotary hand drilling machine, for drilling holes in coal
ironstone and the like. The object of our invention or improvement, is to increase

page_text: the durability of such machines, by using differential bevil gear for giving the
necessary feed, and having a screw bar with a very coarse pitch for rapid withdrawl.
Our invention or improvement consists as follows.
On the screw bar A, which holds and drives the drill, we form a sleeve B, in the
inside of which a key B I or feather is fixed, which fits into a groove AI in the
-screw bar, for the purpose of driving the screw bar, on the outside of the sleeve B
is fixed, a bevil wheel C, and operated upon, by another bevil wheel D fixed on a
spindle I, at right angles to the screw bar A, and to the said bevil wheel D, a
handle E is fixed, for the purpose of turning the screw bar A in the required
:-direction.
On the screw bar A there is also a nut E screwed in the inside to fit screw bar A,
upon the outside of the nut F is fixed a bevil wheel G operated upon by another
bevil wheel H fixed at right angles to the screw bar A and on the same spindle [
as the wheel D that drives the bevil wheel C on the sleeve B.
It will be seen by the foregoing that the screw bar A. and the nut F both revolve
in the same direction therefore to give the necessary forward motion to the screw
bar A the bevil wheels must be so proportioned that the speed ratios of H G
and DC will differ so as to allow the screw bar A to revolve a little quicker than the
nut F Therefore the screw bar A must screw through the nut F and give the feed
:required.
To obtain rapid withdrawal the two bevil wheels are disconnected by lifting the
pawl J out of the ratchet wheel K so that upon turning the handle E the only
wheel that revolves is the one upon the nut F which therefore brings the screw-
bar A back at the full pitch of the screw.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
A combination of improvements in hand drilling machines for drilling holes in
coal ironstone and the like substances by increasing the durability of such machines
by giving the feed in the manner herein before described and as shown by the
accompanying drawing.
Dated this 22nd day of October 1896.
JOHN THOMAS BLACKETT.
WILLIAM HUTTON.