Improvements in or applicable to Chucks.
Year: 1899

page_text: Date of Application, 14th Oct., 1899
Complete Specification Left, 20th June, 1900-Accepted, 4th Aug., 1900
Improvements in or applicable to Chucks.
We, SMITH AND COVENTRY LIMITED, of Gresley Iron Works, Salford, Man-
chester, in the County of Lancaster, Engineers and Tool Makers, and WILLIAM
DUNSTAN FORD SMITH and THEODORE COVENTRY, Managing Directors of the said
Company, do hereby declare the nature of the said invention, to be as follows:-
Our invention relates to improvements to be applied to and combined with
the improvements in chucks for which British Letters Patent have been granted
to Theodore Coventry Numbered 13146 of the 11th June, 1898. '.
The improved chucks are intended to be used more particularly with bars
of metal of uniform diameter, and the chuck may be adjusted to the diameter
of bar to be operated upon by changing the gripping jaws, of which there may
be several sets to suit different diameters of bars, but our present invention is
intended to apply to means for giving slight adjustments to the gripping dies
or jaws to make them suit the varying diameters of bars of metal as they come
from the rolling mills, which though supposed to be of a certain size or dia-
meter vary in many cases therefrom, as chucks of the class to which our inven-
tion refers do not act satisfactorily unless the bars to be operated upon by
them are of the diameter the gripping dies are, adjusted to act upon.
Our invention consists in applying to and combining with the gripper cylin-
der d, of the Complete Specification of the said Letters Patent, a ring which
screws into the end of the gripper cylinder d, this ring having in its interior
the projection that enters the grooves 2, in the grippers c¹.
In other words, the inward flange d', of the gripper cylinder d, of the said
specification, is made separate from the gripper cylinder d, and is screw threaded
to screw into its end more or less, the grippers being thus moved with the ring
endways accordingly in respect to the gripper cylinder, which thus always
remains in relation to the toggle levers e, in the best position for effectively
gripping the bar when the adjustment by this ring screw has been made.
The adjusting ring d, at the back end of the exterior clutch cylinder f, is
only used for giving the best grip and this adjustment is not, and need not be
altered for any size of bar to be operated upon, as the grippers are made to suit
the size of the bar, and are adjusted to it by the ring screw forming the subject
of our present invention above referred to.
Dated this Thirteenth day of October 1899.
PETER J. LIVSEY,
Agent.

page_text: Improvements in or applicable to Chucks.
We, SMITH AND COVENTRY LIMITED, of Gresley Iron Works, Salford, Man-
chester, in the County of Lancaster, Engineers and Tool Makers, and WILLIAM
DUNSTAN FORD SMITH and THEODORE COVENTRY, Managing Directors of the said
Company, 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 improvements to be applied to and combined with
the improvements in chucks for which British Letters Patent have been granted
to Theodore Coventry Numbered 13146 of the 11th June, 1898.
The improved chucks are intended to be used more particularly with bars
of metal of uniform diameter, and the chuck may be adjusted to the diameter
of bar to be operated upon by changing the gripping jaws, of which there may
be several sets to suit different diameters of bars, but our present invention is
intended to apply to means for giving slight adjustments to the gripping dies
or jaws to make them suit the varying diameters of bars of metal as they come
from the rolling mills, which though supposed to be of a certain size or dia-
meter vary in many cases therefrom, as chucks of the class to which our inven-
tion refers do not act satisfactorily unless the bars to be, operated upon by
them are of the diameter the gripping dies are adjusted to act upon.
Our invention consists in applying to and combining with the gripper cylin
der d, of the Complete Specification of the said Letters Patent, a ring which
screws into the end of the gripper cylinder d, this ring having in its interior
the projection that enters the grooves 2, in the grippers c¹.
In other words, the inward flange d, of the gripper cylinder d, of the said
specification, is made separate from the gripper cylinder d, and is screw threaded
to screw into its end more or less, the grippers being thus moved with the ring.
ondways accordingly in respect to the gripper cylinder, which thus always
remains in relation to the toggle levers e, in the best position for effectively
gripping the bar when the adjustment by this ring screw has been made.
The adjusting ring 4, at the back end of the exterior clutch cylinder f, is
only used for giving the best grip and this adjustment is not, and need not be
altered for any size of bar to be operated upon, as the grippers are made to suit
the size of the bar, and are adjusted to it by the ring screw forming the subject
of our present invention above referred to."
We prefer the cylinder, made with the adjusting ring d, but the cylin-
der d, may be made with a flange solid with, it in place of the adjustable ring
and with slots through its sides having cross slots to allow the toggle levers to
be placed in their bearings on the exterior of the lathe spindle.
Fig. 1, is a front end elevation, of our improved chuck, and
Fig. 2, a longitudinal elevation in section.
Fig. 3, is a view of the cylinder d, with a solid flange (shown detached) being
a section on the line A-B, Fig. 4.
Fig. 4, is a longitudinal section and elevation.
:
The parts shown in the figures will be named in order that the invention may
be clearly understood.
a, part of lathe bed; b, part of headstock: e, part of the tubular or open bar
lathe spindle c', exterior coned gripping dies fitting the interior cone in the
end of the lathe spindle made by preference in three segments. These grippers
can be changed for those having a bore suited to the diameter of the bar to be
gripped and held by them; 2, groove in grippers which by our improvement

page_text: fits an internal projecting rim, in a ring, screwed on its exterior to screw
into the outer end of the gripper cylinder d. It is by this ring 4, according
to our improvements that the grippers c¹, can be adjusted to the size or diameter
of the bar to be gripped and held by them, by a suitable key having projec-
tions to fit the holes . d, is a ring screwing on the inner end of the gripper
cylinder d, for adjusting it to the ends of the toggle levers, and when adjusted
it is secured by a set screw d³.
Figs. 3 and 4 illustrate a gripping cylinder d, having a solid flange d, instead
of the adjusting ring d, which is dispensed with (though preferred), but when
so constructed, slots de, have to be formed through the sides of the gripping
cylinder d, with cross slots, so that when it is in position, the toggle levers may
be passed through these slots to their bearings on the lathe spindle.
e, are the toggle levers having their trunnions e', in bearings formed on the
exterior of the lathe spindle c.
In Fig. 2, the toggle lever e, is shown in its middle position of oscillation.
f, is the exterior clutch fork cylinder, which slides on the exterior of the
gripper cylinder d, and at its inner end upon the exterior of the adjusting ring d.
The interior of the clutch cylinder f, has cavities to permit of movement in
the toggle levers, and inclines 2, one for each inclined surface of the toggle
levers, and it is these inclines when the clutch fork cylinder f, is moved end-
ways that actuate or oscillate the toggle levers, the ends of which when the
clutch fork cylinder f, is moved in that direction, come against the inner face of
the adjusting ring d, and this causes the gripper cylinder d, to force the grip-
ping dies inwards to make them grip and hold the bar.
When the clutch fork cylinder is moved in the opposite direction the toggle
levers are oscillated by the inclines 2, in the other way and their ends come
against the ends of the slots in the gripper cylinder d, and force it in the same
direction and thus withdraws the grippers from the internal cone end of the
lathe spindle to the required extent to release the bar.
g, are dies that fit the groove in the clutch fork cylinder f. 92, are their pivots
in the ends of the clutch fork g, having its fulcrum on a shaft 3, in bearings
in brackets b¹, from the headstock b.
To the arm g, from the clutch fork, a link, is jointed, which connects it
with an arm 96, secured on a shaft g, in bearings on the headstock. ³, is a
lever handle secured on the end of the shaft g.
It is by this handle that the grippers are opened to release and closed to grip
and hold the bar or rod to be operated upon in the lathe.
When the handle 8, is moved to grip the bar, the arm g, and link g, are
nearly in a straight line, as in such position their toggle lever action is then.
most intense and they retain the clutch fork cylinder f, in that position.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is:-
1. The combination of the ring &, grippers and cylinder, actuated by
the toggle levers c, substantially as and for the purpose herein before described
and illustrated by the drawings.
2. The combination of mechanism substantially as and for the purpose here-
inbefore described when the cylinder is combined and arranged as shown in
Figs. 1 and 2, or when modified as hereinbefore explained by reference to
Figs. 3 and 4 of the drawings.
I 1 11
. T
1000