Improvements in Drills and Holders therefor.
Year: 1886

page_text: This Specification was, upon the 26th day of October 1887, amended under
Sections 18 to 21. of the Patents, Designs, and Trade Marks Act, 1883.
Improvements in Drills and Holders therefor.
We, ROBERT HENRY READ, of 11, Argyle Street, Tynemouth, in the county of
Northumberland, Engineer and SAM STRICKLAND, of 16, Claremont Place, Gateshead,
in the county of Durham, Engineer, do hereby declare the nature of this invention to
be as follows:-
Firstly, we use a twist drill or rimer, or any parallel drill or rimer, with a cutting
edge at both ends instead of only at one end as in the present system of drilling tools.
And secondly, we use a special holder for our double-ended drill or rimer consisting
of a socket or chuck with self-centreing sliding bits which either may or may not grip
the periphery of the tool but which by means of projections into the groove or grooves
of the tool prevent it from turning when at work. The cutting edge of the tool which
at any time is in the tool-holder we cause to rest in a hole or countersink of suitable
depth and angle at the bottom of the chuck or it may bed against a piece of copper or
other soft material in the bottom of the chuck.
The advantages of our improvements are firstly that we save nearly fifty per cent
in the material of the tool itself which at present goes to form the shank. Secondly,
that the workman using these tools need only leave his work to grind them half as
often as at present. And thirdly, that whereas at present it is customary to use a
different size of tool-holder for every different size of tool our improved socket will
hold several different sizes of tool without requiring to be changed.
And note that wherever in the foregoing declaration the word "tool" is used it is
intended to imply a twist drill or any parallel drill or rimer whatsoever.

page_text: COMPLETE SPECIFICATION (AMENDED).
Improvements in Drills and Holders therefor.
We ROBERT HENRY READ of 8 Great George Street, Westminster in the County of
Middlesex (formerly of 11 Argyle Street Tynemouth in the county of North-
umberland) Civil Engineer and SAM STRICKLAND of 16 Claremont Place Gateshead
in the county of Durham Engineer do hereby declare the nature of our invention for
IMPROVEMENTS IN DRILLS AND HOLDERS THEREFOR and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
Firstly, we use make a twist drill or rimer with a cutting edge at both ends, as
shewn at L on the accompanying drawing, instead of only at one end as in the
ordinary system of twist drills. Our twist drill or rimer may be made by cutting out
the grooves with a revolving milling cutter from a round bar of steel in the ordinary
way or it may be made from-n-bar-of steel rolled to the required finished section
and afterwards twisted to the required pitch of grooves; or it may be made from
a bar of streel rolled nearly to the required finished section and afterwards twisted and
the actual finishing of the grooves be performed by a milling cutter or emery or other
grinder. In the drill shown at L the grooves which are of the usual unsymmetrical
section are not perfectly continuous throughout the length of the drill but are reversed in
section at or about the middle of its length. This reversal is shown by the sectional
views where the projections or rollers in the chuck are shown in working contact with the
straighter or cutting sides of the grooves which would not be the case were the grooves
continuous.
Secondly, we use provide a special holder for eur double ended twist drills or rimers
consisting of a chuck K in which the twist drill or rimer L is inserted and made self
centreing by means of sliding bits M, M moved by an outer screwed socket N with
tapering mouth as shewn in the accompanying drawing. The sliding bits M M may
simply grip the periphery of the twist drill or rimer but preferably they and are
made also to project into the groove or grooves of the twist drill or rimer to prevent
it from turning in the chuck when at work, as shewn at O on the accompanying
drawing The projections on the bits may themselves bear against the sides of the
grooves or a cylindrical or spherical roller or rollers be interposed as shewn at P in
the "section through G H, alternative design" The upper cutting end of the twist
drill or rimer which at any time is in the toolholder we cause to rest in a hole or
countersink of suitable depth and angle at the bottom of the chuck or preferably to
bed against a piece cushion of copper or other soft material at the bottom of the chuck
so as not to injure its cutting edge.
Among the advantages of our improvements are that we save nearly fifty per cent
in the material of the drill or rimer itself which in the ordinary twist drill goes to
form the shank; that the cost of labour in making our twist drill or rimer is con-
siderably less than in making the ordinary twist drill; that when the cutting edge

page_text: becomes dull our twist drill or rimer can be turned end for end more readily than an
ordinary twist drill can be replaced and that the workman need only leave his work to
grind our drills half as often as he would to grind the same number of ordinary twist
drills Our improved toolholder is also will adjustable so as to hold several sizes of
twist drill or riner without requiring to be changed.
And note that our improvements apply to any size of twist drill or rimer whatso-
ever and that the word "rimer" is used throughout this statement to denote a twist
drill which is used for enlarging a small hole to a larger size.
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 :-
1. The use of uny A parallel twist drill or rimer with cutting edge at both ends
constructed substantially in the manner hereinbefore described and illustrated.
2. The use of n A special tool holder for same as described in the foregoing
statement: parallel twist drills or rimers constructed substantially as described and
› illustrated in the accompanying drawings.
ROBERT HENRY READ.
SAM STRICKLAND.
Per J. C. Chapman,,
70, Chancery Lane, W.C.,
Agent for Applicants.

page_text: Date of Application, 19th May, 1886.
Complete Left, 29th Dec., 1886.
Complete Accepted, 15th Mar., 1887.
We, ROBERT HENRY READ, of 11, Argyle Street, Tynemouth, in the county of
Northumberland, Engineer and SAM STRICKLAND, of 16, Claremont Place, Gateshead,
in the county of Durham, Engineer, do hereby declare the nature of this invention to
be as follows:-
Firstly, we use a twist drill or rimer, or any parallel drill or rimer, with a cutting
edge at both ends instead of only at one end as in the present system of drilling tools.
And secondly, we use a special holder for our double-ended drill or rimer consisting
of a socket or chuck with self-centreing sliding bits which either may or may not grip
the periphery of the tool but which by means of projections into the groove or grooves
of the tool prevent it from turning when at work. The cutting edge of the tool which
at any time is in the tool-holder we cause to rest in a hole or countersink of suitable
depth and angle at the bottom of the chuck or it may bed against a piece of copper or
other soft material in the bottom of the chuck.
The advantages of our improvements are firstly that we save nearly fifty per cent
in the material of the tool itself which at present goes to form the shank. Secondly,
that the workman using these tools need only leave his work to grind them half as
often as at present. And thirdly, that whereas at present it is customary to use a
different size of tool-holder for every different size of tool our improved socket will
hold several different sizes of tool without requiring to be changed.
And note that wherever in the foregoing declaration the word "tool" is used it is
intended to imply a twist drill or any parallel drill or rimer whatsoever.
ROBERT HENRY READ.
SAM STRICKLAND.

page_text: COMI MIL DI MUIFICATION.
Improvements in Drills and Holders therefor.
We ROBERT HENRY READ of 11 Argyle Street Tynemouth in the county of
Northumberland Engineer and SAM STRICKLAND of 16 Claremont Place Gateshead
in the county of Durham Engineer do hereby declare the nature of our invention for
IMPROVEMENTS IN DRILLS AND HOLDERS THEREFOR and in what manner the same
is to be performed, to be particularly described and. ascertained in and by the
following statement:-
-
Firstly, we use a twist drill or rimer with a cutting edge at both ends as shewn at L on
the accompanying drawing, instead of only at one end as in the ordinary system of
twist drills. Our twist drill or rimer may be made by cutting out the grooves with a
revolving milling cutter from a round bar of steel in the ordinary way; or it may be
made from a bar of steel rolled to the required finished section and afterwards twisted
to the required pitch of grooves; or it may be made from a bar of streel rolled nearly
to the required finished section and afterwards twisted and the actual finishing of the
grooves be performed by a milling cutter or emery or other grinder.
Secondly, we use a special holder for our double ended twist drill or rimer consisting of
a chuck K in which the twist drill or rimer I is inserted and made self centreing by means
of sliding bits M, M moved by an outer screwed socket N with tapering mouth as shewn
in the accompanying drawing.-The sliding bits M M may simply grip the periphery
of the twist drill or rimer but preferably they are made also to project into the
groove or grooves of the twist drill or rimer to prevent it from turning in the chuck
when at work, as shewn at O on the accompanying drawing-The projections on the
bits may themselves bear against the sides of the grooves or a cylindrical or spherical
roller or rollers be interposed as shewn at P in the "section through G H, alternative
design The cutting end of the twist drill or rimer which at any time is in the
toolliolder we cause to rest in a hole or countersink of suitable depth and angle at the
bottom of the chuck or preferably to bed against a piece of copper or other soft
material at the bottom of the chuck.
"
Among the advantages of our improvements are that we save nearly fifty per cent
in the material of the drill or rimer itself which in the ordinary twist drill goes to
form the shank that the cost of labour in making our twist drill or rimer is con-
;
siderably less than in making the ordinary twist drill; that when the cutting edge
becomes dull our twist drill or rimer can be turned end for end more readily than an
ordinary twist drill can be replaced and that the workman need only leave his work to
grind our drills half as often as he would to grind the same number of ordinary twist

page_text: drills Our improved toolholder also will hold several sizes of twist drill or rimer
without requiring to be changed.
::
And note that our improvements apply to any size of twist drill or rimer whatso-
ever and that the word "rimer is used throughout this statement to denote a twist
drill which is used for enlarging a small hole to a larger size.
Having now particularly described and ascertained the nature of our said Invention,
and in what manner the sanie is to be performed, we declare that what we claim is :-
1. The use of any parallel twist drill or rimer with cutting edge at both ends.
2. The use of a special tool holder for same as described in the foregoing
statement.
ROBERT HENRY READ.
SAM STRICKLAND.