An Improved Chuck for Boring, Facing, Chasing, and Finishing Taps, Valves, Union Joints, and other similar work
Year: 1891

page_text: Date of Application, 25th Nov., 1891-Accepted, 2nd Jan., 1892
COMPLETE SPECIFICATION.
An Improved Chuck for Boring, Facing, Chasing, and Finishing
Taps, Valves, Union Joints, and other similar work.
I RICHARD ROBINSON LAWSON of Solway Brass Works Workington in the
County of Cumberland Brass Founder and Finisher, 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:-
This invention consists of an improved construction of chuck to be applied to a
slide or other lathe, whereby the centering and holding of taps valves union joints
and other similar work in the lathe is greatly facilitated.
The nature of my invention and the manner in which the same is to be performed
or carried into practical effect will be readily understood on reference to the
annexed sheet of drawings and the following explanation thereof.
Fig. 1 on the drawings is a face view of my improved chuck, and Fig. 2 is a
section of the same;
Figs. 3 and 4 are detached views of details hereinafter more particularly
referred to.
My improved chuck is of that class known as "jaw chucks" consisting mainly of
a face plate with a screwed central boss at the back for attaching it to the lathe
spindle. In the face is a slot extending across the diameter in which slide two
jaws which are opened out or closed in by means of a transverse shaft chased with
a right and a left handed screw for that purpose.
In the annexed drawing a is the face plate, the screwed.boss, c and d the two
jaws, and e the right and left handed screw shaft which works through suitably
screwed holes in the two jaws.
In the jaw c is fixed a stud carrying a coned centre point and in the jaw d is
fixed a similar stud / carrying a notched disc which is capable of turning thereon
(see Fig. 4) and besides having the four notches,,,, in the circumference,
has also two holes in the face thereof.
(see Figs. 2 and 4) is a spring bolt which takes into one or other of the
notches, and holds the disc i firmly in position. m, n, are two dies or
clamps one provided with two pins o to fit into the holes in the disc and the other
with a central hole to receive the coned centre point g.
These dies or clamps are made of such a size and form as just to receive the
body of the tap valve or other article with the nozzles which have to be bored,
chased, faced and finished projecting therefrom. The inner face of one of these
dies or clamps is shown at Fig. 3.
They are readily made by casting, using the body of the tap or other article
its if as a pattern in making the mould.
a
will be evident that by the use of a chuck of this construction, taps, valves,
other similar articles may be centred in a lathe with the greatest ease and
accuracy and that by withdrawing the spring bolt and turning the notched disc i
one quarter, a half or three quarters of a revolution any of the nozzles on the body
of the tap valve or union joint may be brought accurately in position to be operated
upon for boring, chasing, facing and finishing without removing it from the
chuck.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
The combination in a "jaw chuck" for holding the bodies of taps valves union
11
inhad alate and curing

page_text: bolt or equivalent adjustable device with a pair of dies or clamps of such a form
and size as will just fit and hold the body of the tap or other article with the
nozzles or other parts to be bored or otherwise worked projecting therefrom so that
it can be turned round in such a way as to bring any of such nozzles into the
working centre substantially as hereinbefore described and illustrated by the 5
drawings annexed.
Dated this 24th day of November 1891
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant..