An Improved Faceplate Chuck for Lathes and other Machines.
Year: 1897

page_text: Date of Application, 9th June, 1897
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PROVISIONAL SPECIFICATION.
An Improved Faceplate Chuck for Lathes and other Machines.
We, CHARLES LOXTON JACKSON, of Wharf Foundry, Bolton, in the County of
Lancaster, Machine Maker, and JAMES EDGE, of 421, Chorley Old Road, Heaton,
near Bolton aforesaid, Draughtsman, do hereby declare the nature of this invention
to be as follows:
Our invention relates to an improved faceplate chuck for lathes and other
machines and the object of our improvements is to fit the screws which actuate the
jaws so that they always work under tension whether the jaws grip the outside or
the inside of the article.
In faceplate chucks of the ordinary construction the screws are only under
tension when the grip is on the inside of the article and it is well known that the
grip is firmer when the screws are under tension than when under compression.
In faceplate chucks of the ordinary construction each screw for a jaw has a
collar at the outer edge of the face plate and at the inner end the screw runs loose
in a socket or hole made to receive it near the centre of the faceplate chuck;
according to our invention we prefer to leave the inner end of each screw of its
full diameter and screw a collar on to the end and secure it on the screw by a pin
or its equivalent; these collars are fitted in holes made, to receive them in the
boss of the faceplate. At the outer end of each screw is the ordinary collar to hold
the screw in its place and the extremity of the screw is squared as usual to receive
a wrench for turning it.
The improved faceplate chuck can be bolted to an ordinary faceplate on the
macliine spindle or it can be screwed direct upon the spindle.
In this construction the screws when in work are always in tension the pull
being on the outer collars when the jaws are gripping internally and on the inside
collars when gripping externally.
Dated this 8th day of June 1897.
H. B. BARLOW & GILLETT,
Agents for Applicants."
An Improved Faceplate Chuck for Lathes and other Machines.
We, CHARLES LOXTON JACKSON, of Wharf Foundry, Bolton, in the County of
Lancaster, Machine Maker, and JAMES EDGE, of 421, Chorley Old Road, Heaton,
near Bolton aforesaid, Draughtsman, 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:—
Our invention relates to an improved faceplate chuck for lathes and other
machines and the object of our improvements is to fit the screws which actuate the

page_text: 4
jaws so that they always work under tension whether the jaws grip the outside or
the inside of the article.
In faceplate chucks of the ordinary construction the screws are only under
tension when the grip is on the inside of the article and it is well known that the
grip is firmer when the screws are under tension than when under compression.
In faceplate chucks of the ordinary construction each screw for a jaw has a
collar at the outer edge of the face plate and at the inner end the screw runs loose
in a socket or hole made to receive it near the centre of the faceplate chuck;
according to our invention we prefer to leave the inner end of each screw of its
full diameter and screw a collar on to the end and secure it on the screw by a pin
or its equivalent; these collars are fitted in holes made to receive them in the
boss of the faceplate. At the outer end of each screw is the ordinary collar to hold
the screw in its place and the extremity of the screw is squared as usual to receive
a wrench for turning it.
In the accompanying two sheets of drawings-
Fig. 1 is a front elevation of a faceplate chuck made according to our invention,
and Fig. 2 is a detail view, on a larger scale, of part of the same.
In the drawings, a designates the body or main portion of the faceplate chuck
and b four radial slots through each of which is passed a screw c with a square
end c¹ for a wrench or screw key; on this end of each screw is a fast collar d' that
bears against the flange of the plate, and the inner end of each screw is preferably
left the full diameter where it passes freely through the solid metal of the body and
is screwed into a collar e placed in a recess in the central boss of the plate the screw
and collar being secured together by a pin f; on each screw is mounted a gripping
jaw g which works in slideways on the plate as usual.
By mounting the screws c as described, that is, with their inner ends fitted in the
independent collars e the screws will be in tension and thus work to the greatest
advantage whether the jaws are gripping from the outside or inside whereas in the
ordinary faceplate chuck the screws are only in tension when the jaws are gripping
on the inside of an article and when gripping on the outside the grip is not
so firm.
The improved faceplate chuck can be bolted to an ordinary faceplate on the
machine spindle or it can be screwed direct upon the spindle.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. 1ne combination with the ordinary collars on the outer ends of the screws
which actuate the gripping jaws of a faceplate chuck, of corresponding collars
attached to the inner ends of said screws whereby the screws are always in tension
whether the jaws are gripping internally or externally.
2. The general arrangement and combination of parts constituting our improved
faceplate chuck substantially as and for the purposes herein described and as
illustrated by the drawings.
ليم
1
1 1000
H. B. BARLOW & GILLETT,
Agents for Applicants, 17, St. Ann's Square, Manchester.