Improvements in and relating to Chucks.
Year: 1897

page_text: Improvements in and relating to Chucks.
I, CHARLES EDWARD HAYTON, of 15, Montgomery Street, Hollinwood, near
Manchester, Lancashire, Engineer, do hereby declare the nature of my invention
to be as follows:
This invention has reference to improvements in and relating to chucks which
will be capable of easy reversal and removable.
According to my improvements I form a bottom "dog" with a hollow head, and
a centre collar with projecting centre stem is formed or fitted in this head. A rim
is formed round this head with recessed part below it, and the heads of two or more
screw pins are fitted and are free to move between this recessed rim and a recessed
part below collar. A top reversible dog is fitted over the head of bottom dog by
forming same with holes and mounting these over the screw pins.. Segmental collars
are formed round the under surface of top dog between the pin holes to fit down into
hollow head of lower dog, and a recess is fitted at centre to fit over projecting stem
on centre collar of lower dog. Four or other number of projecting segments are
formed at spaced distances apart round top rim of bottom dog and corresponding
segmental recesses are formed at outer part of top dog so as to fit over and form a
clutch with the projections on lower dog. Screw nuts are fitted over the screw pins,
and for reversing the positions of top dog it is only necessary to slacken these nuts
and turn the dog round to the position desired.
A stem is formed on lower dog and a screw threaded hole is formed through this
stem for a screw to work in, this screw being passed through the chuck frame, and
a plate or washer and screw nut is fitted on lower end of dog stem to bear over
bottom face plate of chuck frame. The screw is turned by a portable handle to move
the dog to and fro as desired.
A bearing split collar is fitted round the screw within a recess in frame and
expanded into position by a portable tapered screw pin, and a check pin might be
further fitted if desired.

page_text: and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement, that is to say: -
This invention has reference to improvements in and relating to chucks which
will be capable of easy reversal and removal, and have great strength.
And in order that my said invention and the manner of carrying same into
practice may be properly understood, I have hereunto appended a sheet of explana-
tory drawings in which Figure 1 represents a front view of one of my reversible
chuck dogs with face plate broken away and Figure 2 is a side view at right angles
to Figure 1, and partly in section. Figure 3 is a plan or inside view of the bottom
or inner dog and Figure 4 is a sectional view at right angles through same.
Figure 5 is a plan view looking up on under surface of the top or outer dog, and
Figure 6 is a sectional view at right angles, while Figure 7 represents views of the
split collar device.
Referring to these drawings:
According to my improvements I form the bottom or inner part of dog a with
a hollow part a¹ and a centre collar a² with projecting centre stem a³ formed or
fitted on this dog a. A rim is formed round this dog a with recessed or grooved
part al below it, and the heads of two or more screw pins c are fitted and are free
to move between this recessed rim and a recessed or grooved part below collar a².
A top or outer reversible dog b is fitted over the head of bottom or inner part by
forming same with holes c¹ mounting these over the screw pins c and are secured
by nuts in any convenient position. Segmental collars 6 are formed round the
under surface of top or outer dog between the pin holes c¹ to fit down into hollow
head a¹ of bottom or inner part of dog, and a recess 63 is fitted at centre to fit over
projecting stem a³ on centre collar a² of lower or inner part of dog. Four or other
number of projecting segments a¹ are formed at spaced distances apart round top
rim of bottom or inner part of dog and corresponding segmental recesses 64 are
formed on the inside of top or outer dog 6 so as to fit over and form a clutch with
the projections a' on lower or inner dog. The screw nuts are fitted over the screw
pins c as above described and for reversing the positions of top or outer dog b it is
only necessary to slacken these nuts raise the top or outer dog b a little and turn
same round to the position desired, when the nuts would be again tightened up.
The screw pins c can be inserted and removed through a hole at a5 in lower dog.
A stem is formed on lower or inner part of dog, and a screw threaded hole d¹ is
formed through this stem for a screw e to work in, this screw e being passed through
the face plate or chuck frame A and a plate or washer d² and screw nut d³ is fitted
on inner or lower end of dog stem d to bear and bridge over the radial slots at the
bottom or inner side of face plate or chuck frame A. The screw e is turned by
placing a portable handle over the end e¹ to move the dog to and fro as desired.
A bearing split collar f is fitted round the screw e within a recess A¹ in frame A
and expanded into position by a portably tapered screw pin f¹ and a check pin might
be further fitted if desired.
In removing these parts the tapered screw pin f¹ would be taken out, and the
collar pushed round with a piece of fine wire, until one half comes out and then
the other half can be pushed back from edge of plate, that is through the main
screw hole. The dog screw e can then be taken out and the nut d³ and plate dª
removed from dog, and the chuck is clear, all of which operations can be done in a
very short time.
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. A chuck constructed and arranged in the manner herein described in
reference to and shown in the accompanying drawings.
Second. In chucks, the combination of bottom and top dogs with screw pins
arranged in the manner herein set forth.

page_text: Third. In chucks, the combination with the operating screw of a bearing split
collar expanded into position by a tapered screw pin substantially as herein set
forth.
Dated the 1st dox of Tahmam 1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.