Improvements in Screw Chasers and in Handles therefor and for other Hand Turning Tools,
Year: 1893

page_text: Date of Application, 27th Jan., 1893
Complete Specification Left, 27th Oct., 1893-Accepted, 27th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in Screw Chasers and in Handles therefor and for
other Hand Turning Tools,
We, CLARENCE SINCLAIR WALKEK, File Maker, and DURWARD GEORGE
MALCOLM WALKER, Tool Maker, both of Bath Street, and Whittall Street, in
the City of Birmingham, do hereby declare the nature of this invention to be as
follows:-
This invention has roference to scrow chasers and handles therefor and for
other hand turning tools.
A screw chaser made according to this invention for use in chasing outside
sorew threads is a rectangular section short steel bar with the ends (which are
screw threaded) made wider than and tapering down to the centre part of the
bar. Thus either end of the chaser can be used. The objects of this double
taper form are to enable the corners of the chaser to be used close up to a
shoulder on the screw and so as to enable either end of the chaser to he more
firmly held in the handle hereinafter described.
We also with the sanie objects in view make scrow chasers for inside screws
double ended that is to say one of these inside chasers made according to this
invention consists of a short rectangular section steel bar with a lateral projecting
part at each end which is screw threaded in the usual way.
The said double ended screw chasors above described requiro a special form
of handle for holding the same constructed so as to fix to either end of the
chaser when the other end is required to be used. This handle we make hollow
by preference of malleable cast iron or other cast metal of somewhere about
the same shape as a file handle. The said handle is made in two parts that is to say
it is divided about centrally in two parts in a longitudinal direction for a certain
distance from the front end, sny for about half the length of the haudle. These two
parts of the handlo are secured together by a taper screwed ferrule which is
screwed on to the front end of the handle and by one part of the handle having
a dowel or projection which takes into a corresponding hole or recess in the
other part of the handle. The smaller of the two parts of the handle is pre-
vented from moving sideways by the back end thereof fitting into a recess in
the larger part of the handle. Each of the two parts of the handle is shaped
inside so as to fit against and grip the chaser. When the chaser is inserted
between the two parts of the handle and these are secured together by the screw
ferrule above described the chasor is perfectly secure as the enlarged end of the
same which is enclosed in the handle makes it impossible to withdraw the chaser
from the handle without first removing the ferrule.
In order to make one and the same handle serve for either an outside chaser or
an inside chaser we may make the said central hole in the handle large enough
and of a shape to suit the outside chaser and then provide two removable filling
up pieces which can be fitted in the hole so as to make the handle fit the inside
chaser which is smaller than the outside chaser. The improved handle above
described can also be similarly used for holding other hand turning tools.
Dated this 26th day of January 1893.

page_text: Improvements in Sorew Chasers and in Handles therefor and for
other Hand Turning Tools.
We, CLARENCE SINCLAIR WALKER, File Maker, and DURWARD GEORGE
MALCOLM WALKER, Tool Maker, both of Bath Street, and Whittall Street, in
the City of Birmingham, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascor-
tained in and by the following statement :—
The first part of this invention consists in making double ended inside and outside
screw chasers of the improved forms herein described so as to enable either end of
the chaser to be firmly held in a handle made according to the second part of this
invention; and the second part of this invention consists of the herein described
improvements in handles for holding the double coded screw chasers and
for other turning tools tho said handles being so constructed as to be readily
fixed to either end of the chaser when the other end of the chaser is required to
be used.
We will describe this invention by referring to the accompanying drawings on
which Fig. I represents in front and side olevation an outside screw chaser made
according to this invention; Fig. 2 is a front elevation, Fig. 3 is a side elevation
and Fig. 4 is a sectional plan of the same screw chaser fixed in a handle made
according to the second part of this invention; Fig. 5 shows the said handlo and
part of the screw chaser in section and Figs. 6, 7 and 8 each represent a separate
part of the said handle as hereinafter described; Fig. 9 represents in front and side
elovation a double ended inside screw clusor made according to this invention and
Fig. 9 is another form of the same; Fig. 10 is a sectional elevation of the handle
with the screw chaser shown by Fig. 9 fixed therein and Figa. 11 and 12 each
represent a part of tho said handle shewn by Fig. 10.
The same letters of reference indicate the same or corresponding parts in all
the figures of the drawings.
A double ended screw chaser made according to this invention for use in chasing
outside screw threads is a rectangular section short steel bar A' with the ends
which are screw threaded inade wider than and taporing down to the centre part of
the bar as shewn by Fig. 1. This double taper form of the chaser enables the
corners of either end of the chaser to be used close up to the shoulder on the screw
and as heroinafter described either end of the chaser can be firmly held in our
improved handle whilst the other end of the chaser is in usc.
We will now refer more particularly to Figa. 2, 3, 4, 5, 6, 7 and 8 and describe
how we make the improved handles according to the second part of this invention
for holding the double ended screw chaser shown by Fig. 1. This handle we make
of somewhere about the usual shape such for instance as shown by Figs. 2, 3
and 5. The said handle may either be made hollow of malleable cast iron or other
metal or solid and in the latter case the main portion B' of the same is preferably
made of wood as shown or it may be made of other suitable material. When the
main portion B' of the handlo is of metal it is formed in a piece with the part B².
That portion of the handle by which the chaser A' is held is as shewn divided
about centrally in a longitudinal direction for a certain distance from the front end
of the bandle so as to form the two parts B and C which are secured together by
the tapered screw ferrule D screwed on to the front end of both 13 and C and by
one of the parts say the part C being made with inclined projections c' which fit
into the correspondingly shaped recess b' in the part B and by the part C of the
handle having a projection which takes into a corresponding hole or recess b³ in
the other part B' of the hundle. The part B' of the handle is made as a socket
nt b² so as to screw into or otherwise fix to the part B' of the handle. The part C of

page_text: the handle is recessed at c inside so as to fit against the chaser A' and the other
portion B' of the handle is also similarly recessed at 6 to fit against the chaser.
To fix tho chaser A' in the handle the ferrule D and part C have first to be
removed and then when the chaser A' has been placed in the recess 6 of the
part B the other part C is fitted in place and the socket D screwed upon both the
parts B and C as shewn in Figs. 2, 3 and 5; thus the chaser A' is perfectly secure
to the bandle as the enlarged end of the chaser A' which is enclosed in the handle
makes it impossible to withdraw the chaser from the handle without first removing
the ferrule D.
Double ended sorow chasers for inside sorow threads are made according to
this invention of the form shewn by Fig. 9 or by Fig. 9" where it will be scen that
the screw chaser consists of a short rectangular section steel bar A' with a lateral
projecting part a at each end which is screw threaded in the usual way. As in the
case of the double ended screw chaser A' for outside throads above described either
end of this double ended screw chasor A. can be used and when fixed in one of our
improved handles the side projecting part which is enclosed in the handle will
prevent the screw chaser being pulled out of the handle without first removing the
socket D and part C. Our said improved handle for holding this double ended
screw chaser for inside threads is shown in sectional elevation by Fig. 10 and
Figs. 11 and 12 show the parts B and C of the same separately. This handle is
practically the same as that hereinbefore described with reference to Figs. 2, 3, 4,
5, 6, 7 and 8 except that the slots or recesses b c are made of a shape to fit the
chaser A as will be clearly seen by an examination of Figs. 10, 11 and 12.
Our improved handle above described is similarly made for holding other hand
turning tools the parts B and C being shaped at 6 and c³ to suit the particular
form of tool with which the handle is used.
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
"
1. Making double ended screw chasers for outside threads of the rectangular
section double taper form substantially as hereinbefore described and represented
by Fig. 1 of the accompanying drawings and for the purposes set forth.
2. The improved screw chaser A² for inside screw threads made double ended
with a screw threaded lateral projection a at each end as hercinbefore described and
illustrated by Fig. 9 or by Fig. 9 of the accompanying drawings and for the
purposes set forth.
3. The construction combination and arrangement of parts forming the improved
handle for holding double ended screw chasers and other hand turning tools sub-
stantially as hereinbefore described and illustrated by the accompanying drawings
whether the part B' is made separate from the handle proper as shewn or in a pieco
therewith as heroin sot forth.
4. The combination of parts forming the double ended screw chaser for outside
threads and its removable handle constructed and arranged and fitted together in
the manner substantially as hereinbefore described and illustrated by Figs. 1, 2, 3,
4, 5, 6, 7 and 8 of the accompanying drawings.
5. The combination of parta forming the double ended screw chaser for inside
threads and its removable handle constructed and arranged and fitted together in
the manner substantially as heroinboforo described and illustrated by Figs. 9, 9*,
10, 11 and 12 of the accompanying drawings.
Dated this 26th day of October 1893.
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.