Improvements in Chucks for Lathes and other Machine Tools.
Year: 1889

page_text: Date of Application, 2nd Apr., 1889
Complete Specification Left. 2nd Jan., 1890-Accepted, 8th Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Chucks for Lathes and other Machine Tools.
I, JOSHUA BARLOW of 13 Paradise Street, Coventry in the County of Warwick,
Outfitters Assistant, do hereby declare the nature of this invention to be as
follows:
My invention relates to an improved chuck" for use on lathes and similar
machine tools, whereby I obtain great simplicity of manufacture, combined with
strength of parts, and convenience in use.
According to my invention I construct my improved chuck as follows, viz.
I form a disc similar to an ordinary lathe face plate, and preferably screw it on
the nose of lathe spindle exactly as a face-plate is fitted. On the face of this disc I
fit two sliding jaws, the one, a jaw of V or other convenient form, sliding (in a slot
or parallel slots) radially from centre of disc.
This jaw is free to slide until the work is in the required position and then it is
firmly secured to the face of disc, by bolt or bolts or other convenient means.
The second jaw is diametrically opposed to the first jaw, and is actuated preferably
by a screw, which screw causes the work and jaws to slide along the diameter of
disc, till the work arrives in the position required.
By my invention I obtain a chuck capable of-
1. Holding work concentrically or eccentrically.
1
2. Having larger gripping surfaces than can be obtained with the usual step-jaw
chuck.
3. Holding the work nearer to the end of lathe spindle and thus securing
steadiness.
It is obvious that instead of screwing chuck on lathe spindle, I may bolt it to the
lathe face-plate, thus making one chuck capable of being used on lathes having
various sized spindles.
Dated this and of Al 108a
COMPLETE SPECIFICATION.
Improvements in Chucks for Lathes and other Machine Tools.
I, JOSHUA BARLOW of 13 Paradise Street, Coventry in the County of Warwick,
Outfitters Assistant, 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:-
My invention relates to an improved "chuck" for use on lathes and similar
machine tools, whereby I obtain great simplicity of manufacture, combined with
strength of parts, and convenience in use.
According to my invention I construct my improved chuck as will be best under-
stood by reference to the accompanying drawings Figure 1 being a front elevation
and Figure 2 a back elevation. Similar letters of reference refer to like parts in
all the figures.
1 form a disc A similar to an ordinary lathe face plate, and preferably screw it on
the nose of lathe spindle exactly as a face-plate is usually fitted. On the face of
this disc I fit two sliding jaws B and C the one B a jaw of V or other convenient
form, sliding in a slot or parallel slots B¹ B¹ from centre of disc.

page_text: This jaw is free to slide until the work is in the required position and then it is
secured to the face of the disc by bolt or bolts B2 B2 or other convenient means.
The second jaw C is diametrically opposed to the first jaw B, and is actuated
preferably by a screw C, which screw C₁ causes the work and jaws to slide along
the diameter of disc A till the work arrives in the position required.
Various modifications or arrangements of devices for securing and holding. the
jaws may be devised other than those shown although the example given in Figures 1
and 2 indicate the general construction, that is, a chuck so made that one jaw may be
caused to slide by the pressure of the other and thus the work may be centered or
placed excentrically by the action of one screw only.
By my invention I obtain a chuck capable of
1. Holding work concentrically or eccentrically.
2. Having larger gripping surfaces than can be obtained with the usual step-jaw
chuck.
3. Holding the work nearer to the end of lathe spindle and thus securing
steadiness.
It is obvious that instead of screwing the chuck onto the lathe spindle, I may bolt
it to the lathe face-plate, thus making the same chuck capable of being used on
lathes having various sized spindles.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is
In chucks for lathes and other machine tools the combination with the disc A of
the jaw B capable of being slidden and secured in slots B¹ together with the jaw C
also capable of being adjusted in slot and in such manner that one jaw may be
caused to slide by the pressure of the other jaw substantially as and for the purposes
herein described with reference to the accompanying drawings.
Dated this 1st day of January 1890