Improvements in Chucks for Lathes and Milling Machines.
Year: 1893

page_text: Date of Application, 9th Dec., 1893
Complete Specification Left, 25th Aug., 1894-4ccepted, 13th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in Chucks for Lathes and Milling Machines.
We, CHARLES TAYLOR and GEORGE BENJAMIN TAYLOR both of Nos. 43
and 44 Bartholomew Street, Birmingham in the County of Warwick, Machinists
do hereby declare the nature of this invention to be as follows:-
Our invention consists of improvements in chucks for lathes and milling machines
in which the jaws of the chuck are operated by a scroll or spiral driven by a bevil
pinion. A chuck of the kind referred to is described, represented and claimed in
the Specification of Letters Patent granted to us on the 18th day of October 1887
No. 14146 and our present invention consists of improvements in the said patented
chuck.
In the drawings of the said Specification the axis of the bevil pinion by which
the scroll or spiral is driven is represented at right angles to the axis of the chuck.
According to one of the improvements constituting our present invention we incline
the axis of the pinion towards the face of the chuck so that the axis of the said
pinion forms with the axis of the chuck an acute angle; the head or outer end of
the axis of the bevil pinion is thereby brought nearer to the face of the chuck than
its inner end. By this improvement the body or case of the chuck can be made of
less thickness than when the axis of the pinion is at right angles to the axis of the
chuck and in consequence of the less thickness of the said chuck its weight is
largely diminished.
According to another of the improvements constituting our present invention,
we make the bore of the spiral conical instead of cylindrical as in the patented
chuck already referred to, and we also make the inner ring of the chuck of a
corresponding conical figure so as to fit within the conical bore of the spiral. By
this improvement the conical faced ring may be set forward so as to tighten up the
parts and compensate for the wear of the said parts. This setting forward or
tightening of the parts is effected by set pins preferably three in number the said
pins being tapped into the back half of the chuck. We do not however limit
ourselves to this particular method of setting forward the inner conical ring of
the chuck.
The conical bore and the conical inner ring of the chuck may be applied to
chucks having spirals the convolutions of which are in one plane as well as to
chucks the summits of the convolutions of which are in a conical surface.
By our improvements the chuck is made much lighter than the chuck described
and claimed in the Specification of the Patent hereinbefore referred to and the
manufacture of the chuck is simplified.
Dated this 9th day of December 1893.
W. T. WHITEMAN,
Agent for the Applicants.

page_text: Improvements in Chucks for Lathes and Milling Machines.
We, CHARLES TAYLOR, and GEORGE BENJAMIN TAYLOR, both of Nos. 43
and 44 Bartholomew Street Birmingham in the County of Warwick, Machinists,
do hereby declare the nature of our 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 consists of improvements in chucks for lathes and milling machines
in which the jaws of the chuck are operated by a scroll or spiral driven by a bevel
pinion. A chuck of the kind referred to is described, represented and claimed in
the Specification of Letters Patent granted to us on the 18th day of October 1887,
No. 14,146 and our present invention consists of improvements in the said patented
chuck.
In the drawings of the said Specification the axis of the bevel pinion by which
the scroll or spiral is driven is represented at right angles to the axis of the chuck.
According to one of the improvements constituting our present invention we incline
the axis of the pinion towards the face of the chuck so that the axis of the said
pinion forms with the axis of the chuck an acute angle; the head or outer end of
the axis of the bevel pinion is thereby brought nearer to the face of the chuck than
its inner end. By this improvement the body or case of the chuck can be made of
less thickness than when the axis of the pinion is at right angles to. the axis of the
chuck and in consequence of the less thickness of the said chuck its weight is
largely diminished.
According to another of the improvements constituting our present invention we
make the bore of the spiral conical instead of cylindrical as in the patented
chuck already referred to, and we also make the inner ring of the chuck of a
corresponding conical figure so as to fit within the conical bore of the spiral. By
this improvement the conical faced ring may be set forward so as to tighten up the
parts and compensate for the wear of the said parts. This setting forward or
tightening of the parts is effected by set pins preferably three in number the
said pins being tapped into the back half of the chuck. We do not however
limit ourselves to this particular method of setting forward the inner conical ring
of the chuck.
Figure 1 of the accompanying drawings represents in back elevation about one
half of the front part of a chuck containing our improvements and Figure 2 is a
vertical section of the complete chuck, the said section being taken on the line .c, c
Figure;
Figure 3 is a vertical section of a portion of a chuck containing a modification of
our invention as will be hereinafter described.
The same letters of reference indicate the same parts in the several figures of
the drawings.
a is the front part of the chuck and is the back part, the two parts a and b
being connected together by screw pins taking into screwed holes c, c, c (Figure 1)
as usual. The chuck is fixed to the face plate of the lathe by means of screw pins
carried by the said face plate taking into screwed holes in the back part of the
said chuck, one of which holes is marked d in Figure 2; e is the ring having on its
front face the spiral or scroll by which the jaws of the chuck are actuated and
having on its rear face bevil teeth with which the bevil pinions 9 (three of which
are preferably used) gear for rotating the scroll or spiral. The axes of the pinions g
are inclined towards the face of the chuck as represented in Figure 2 for the
purpose hereinafter described.
The bore or inner edge of the spiral or scroll ring e is made conical as
represented in Figure 2 and the said chuck is provided with a conical bearing

page_text: ringh for the said spiral or scroll ring
to turn upon. The said bearing ring h
is capable of adjustment by means of screw pins, one of which is marked i in
Figure 2, for compensating for wear of the parts. The conical ring h has semi-
circular recesses in its back edge, as will be seen by reference to Figure 1, where
one of the bevil pinions is omitted, which recesses together with similar recesses in
the back part 6 of the chuck constitute the bearings for the inner ends of the
spindles of the bevil pinions g.
Instead of making the bore of the spiral or scroll ring e conical it may be
cylindrical as represented in Figure 3. In this case we employ two rings and h³,
the ring constituting the bearing ring for the spiral or scroll ring e and the other
ring having the semi-circular recesses constituting the half bearings for the
inner ends of the spindles of the pinions 9, 9, 9. The ring his split or divided to
permit of its expansion and the seat for the said ring is made conical so that when
adjusted by means of pins, similar to those marked in Figure 2, acting through
the ring h², the said ring his expanded and wear of the parts compensated for.
The conical bore and the conical inner ring of the chuck and also the modification
having two rings may be applied to chucks having spirals the convolutions of which
are in one plane as well as to chucks the summits of the convolutions of which are
in a conical surface.
By our improvements the body or case of the chuck can be made of less breadth
or thickness than when the axes of the pinions are at right angles to the axis of
the chuck consequently the weight of the chuck is much reduced. Further, by our
improvements the manufacture of the chuck is simplified.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that we
claim as our invention ;-
First. In chucks for lathes and milling machines in which the jaws of the chuck
are operated by a scroll or spiral driven by a bevil pinion or bevil pinions,
inclining the axis of the pinion or the axes of the pinions towards the face of the
chuck so that the said axis or axes makes or make an acute angle with the axis of
the chuck substantially as and for the purposes hereinbefore described and
illustrated in the accompanying drawings.
Secondly. In chucks for lathes and milling machines in which the jaws of the
chuck are operated by a scroll or spiral driven by a bevil pinion or bevil pinions,-
making the bore of the scroll or spiral ring conical and providing the said scroll or
spiral ring with a conical bearing ring capable of adjustment substantially as and
for the purpose herein before described and illustrated in the accompanying
drawings; also the modification in which two bearing rings are used with a scroll
or spiral ring having a cylindrical bore, the said two bearing rings being arranged
and acting substantially as and for the purposes hereinbefore described and
illustrated in the accompanying drawings.
Thirdly. The means of adjusting the bearing ring of the spiral or scroll ring so
as to compensate for wear of the parts, namely, by means of set pins, preferably
three in number, tapped into the back part of the chuck and screwed against the
said bearing ring substantially as hereinbefore described and illustrated in the
accompanying drawings.
Dated the Twenty-first day of August 1894
CHARLES TAYLOR.
GEORGE BENJAMIN TAYLOR.