AN IMPROVED DRILL STOCK
Year: 1884

page_text: I JAMES LIGHTFOOT SHORROCK of 139 Manchester Road Accrington in the
County of Lancaster, Mechanic do hereby declare the nature of my invention for
AN IMPROVED DRILL STOCK to be as follows:-
This improved drill-stock is intended to be used a as substitute for the ratchet
brace usually employed for drilling by hand, and it is somewhat the same form
externally consisting chiefly of a lever or arm terminating at one end in a socket
or barrel in which is mounted (so as to be capable of revolving) a cylindrical tool
carrier or spindle into one end of which are fitted the bits or drills as may be
required, and in the other end is tapped the following screw for forcing the bit or
drill forwards as the work proceeds.
Instead however of employing a ratchet and spring pawl for giving the grip
between the inside of the socket or barrel and the outside of the tool carrier or
spindle I employ the following device.
Across the periphery of the tool carrier I form two, three, or more inclined
recesses and in each of these recesses between the inclined face of tool carrier and
the inside of the socket or barrel I insert a sinall steel roller provided with a spring
which has a constant tendency to force the roller up the incline and wedge it fast
between the latter and the inside of the socket or barrel; and thus it will be
evident that on moving the lever or arm in one direction the rollers will have a
tendency to run down the inclines and hence the socket will un freely on the tool
carrier without turning it, but on moving the lever in the reverse direction the
rollers will have a tendency to roll up the inclines and thus the arm and the tool
carrier will become locked together and the tool carrier will be caused to revolve.
By this improved construction the drill stock will be much casier to work, spring
pawls or other parts liable to fracture are dispensed with, and there is no sound
produced by the working of the tool as in the ratchet brace.
GEORGE DAVIES,
Agent for the Applicant,
4, St. Ann's Square, Manchester.

page_text: COMPLETE SPECIFICATION.
"
I JAMES LIGHTFOOT SHORROCK of 139 Manchester Road Accrington in the
County of Lancaster Mechanic do hereby declare the nature of my invention for
"AN IMPROVED DRILL STOCK and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
This improved drill stock is intended to be used as a substitute for the ratchet
bruce usually employed for drilling by hand, and it is of somewhat the same form
externally as will be perceived on reference to the accompanying drawing which
forms part of this Specification, Fig 1. being a section taken through the line A-B
in Fig. 2 and Fig. 2 a section taken through the line C-D in Fig. 1.—Fig 3.`is
a section taken through the working barrel at the line E-F in Fig 1. the other
parts being drawn in elevation.
My improved drill stock consists chiefly of a lever or arma, a terminating at one
end in a socket or barrel b, b in which is mounted (so as to be capable of revolving)
a cylindrical tool carrier or spindle c, c into one end of which are fitted the bits or
drills as may be required and in the other end is tapped a screw d, d with a pointed
head working in a recess in the end of the following screw employed as usual for
forcing the bit or drill forwards as the work proceeds.
Instead however of employing a ratchet and spring pawl for giving the grip
between the inside of the socket or barrel b b and the outside of the tool carrier or
spindle c, c I employ the following device.;
Across the periphery of the tool carrier or spindle c, c I form two, three, or more
inclined recesses e, e (four being shown on the drawing). The inclined surface of
the recesses may be either flat or curved as shown in Fig 1. and in each of these
recesses Letween the inclined face of the tool carrier c, c and the inside of the
socket or barrel b, b I insert a small steel roller f.f provided with a spring g, I
which has a constant tendency to force the roller f,fup the incline and wedge it
fast between the latter and the inside of the socket or barrel b, b and thus it will
be evident that on moving the lever or arm a, a in one direction the rollers f, ƒ will
have a tendency to run down the inclines and hence the socket b, b will run freely
on the tool carrier or spindle c, c without turning it but on moving the lever a, a
in the reverse direction the rollers f,f will have a tendency to roll up the inclines,
and then the arm a, a and the tool carrier c, c will become locked together and the
tool carrier will be caused to revolve.
By this improved construction the drill stock will be much easier to work, spring
pawls or other parts liable to fracture are dispensed with and there is no sound
produced by the working of the tool as in the ratchet brace.
I would here remark that although I have shown my invention as applied to a
"single action" drill stock for the sake of illustration I reserve to myself the right
to apply the same combination in duplicate to a "double action" drill stock as will
be readily understood by any competent mechanic without further illustration or
description.
I would also observe that it will bo evident, that instead of drills, augers or
other boring tools might be used with these stocks.

page_text: 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
First The combination (in a drill stock to be used by hand) of an arm or lever
having a cylindrical socket or barrel at one end with a cylindrical tool carrier made
with inclined recesses and fitted to revolve within the said socket or barrel; a
steel or other suitable roller being placed in each inclined recess substantially in
the manner and for the purposes herein before set forth, and
Secondly, I claim the combination with the rollers so situated of a spring having
a constant tendency to force the said rollers up the inclines as hereinbefore
described.
GEORGE DAVIES,
Agent for the Applicant,
4, St. Ann's Square, Manchester.