IMPROVEMENTS IN LATHE CHUCKS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We, JOHN HENRY STOREY, of 37 Farringdon Street, Engineer, and JAMES
FREDERICK PHILLIPS, of 62 Holborn Viaduct, Engineer, both in the County of
Middlesex, do hereby declare the nature of the said invention for IMPROVEMENTS
IN LATHE CHUCKS to be as follows:-
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This invention has for its object improvements in lathe chucks, and consists
essentially of a face; plate, with radiating, slots having serrated or other locking
teeth at the sides, arranged at a convenient distanct below the surface of the plate.
The object of these teeth and slots is for the purpose of receiving a block with
corresponding teeth or locking divice, and a screwed pin on the dog, or block, or
both, passing through the slot to the other side of the plate by which both it and
the block is secured by the nut or nuts These teeth or in some cases a smoothe
surface, may be advantageously arranged on the opposite side of the plate if
desired, or in some cases on the side of the slot, or the dogs can be applied to
ordinary face plates. The aforesaid blocks in addition to the before mentioned
method of adjustment are provided with set screws passing through them to effect
a firm grip; It will therefore be seen that the said chuck can be used as a face plate,
by removing the dogs, and, though possessing all, the advantages of modern
requirements yet it is of the most simple cheap and effectual character.

page_text: COMPLETE SPECIFICATION.
We, JOHN HENRY STOREY, of 37, Farringdon Road, Engineer, and JAMES
FREDERICK PHILLIPS, of 62, Holborn Viaduct, Engineer, both in the County of
Middlesex, do hereby declare the nature of our invention for "IMPROVEMENTS IN
LATHE CHUCKS," and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:―
The object of this invention is the introduction of improvements into the manu-
facture of lathe chucks.
In order that our invention, and the means by which the same is to be carried
into successful operation, may be thoroughly understood, we will proceed to describe
the same in detail, referring in so doing to the accompanying figures which are to
be taken as part of this specification and read therewith, and in which like parts
are marked throughout the figures in which they occur with the same reference
letters, respectively.
Fig 1 is a perspective illustration of a four-jaw chuck constructed according
to our invention.
Figs. 2 to 5 illustrate a three-jaw chuck; Figs. 6 to 10 being details of
modifications.
Fig. 2 is a front elevation with the dog or jaw omitted from one groove, to
shew the face of the latter.
Fig. 3 is a side elevation, partly in section, shewing the jaws as close to the centre
as they can be.
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Fig. 4 is a sectional side elevation shewing the jaws wide open.
Fig. 5 is an elevation of the back of the chuck.
Fig. 6 is an illustration of a modified form of tooth.
Figs. 7 and 8 illustrate, in elevation and plan respectively, a further modification
of tooth, according to which they are made similar to the fangs of an animal.
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Figs. 9 and 10 illustrate, in plan and side elevation respectively, a variant
construction of a chuck made according to our invention.
A is the face plate with radial grooves, or slots, a, formed therein extending
from the edge of the face plate to its centre. Upon the face of each groove are
formed teeth, a', of any section capable of contributing to a tight grip between
two contacting surfaces; and a slot, b, is carried through the plate.
Alternate forms of teeth are described further on.
C,
The back of the jaw, C, is capable of sliding in the groove a, and carries a bolt
the shank of which passes through the slot, b, at the back of which necessary
loosening and tightening are effected by means of the uut, c¹. D is a block, capable
of sliding in the groove a, as well as on the face plate A. Its back is serrated to
correspond with the face of the groove.
We do not confine ourselves to placing the teeth on the face of the groove, for
we may, according to our invention, form them upon the sides or back of the groove,
but when they are formed on the sides of the groove, the sides of the block D
will be serrated to correspond, or we may serrate both face and sides of both groove
and block.

page_text: E is a set screw, the plain shoulder of which works in the block D, while the
screw enters the jaw C. A stop-pin, e, is passed through the block D, and entering
a groove, e', cut in the shoulder of the set screw, prevents it from taking any motion,
independently of its block, other than a circular one. Or a projecting collar, e, as
in Fig. 10, may be formed on the shank, working between the block D, and a
ferrule, d, the latter secured by a pin, d. Any other equivalent device for
preventing the set screw taking a linear motion in the direction of its axis, may
be adopted.
The method of setting a chuck of our invention as described above is as
follows:
The nuts, c¹, are first loosened sufficiently to allow of the blocks, D, being moved
along the grooves, a. They are set, approximately, in their required position taking
care, however, to set them far enough from the centre. The nuts are then tightened
sufficiently to make the blocks grip the serrated surfaces of the grooves beyond the
chance of slipping, and the jaws are caused to grip the work by turning the set
screws, E. The resistance of the work to the advance of the jaws will tighten the
grip of the blocks, and a final turn to the nuts, c¹, maintains the various pressures
in perfect balance.
The work is released by repeating the above described steps in the reverse order.
Fig. 6 illustrates a form of tooth for groove, a, and block D, we sometimes use.
Instead of being of a V section, as the teeth illustrated in Figs. 2 to 5, it is nearly
rectangular.
Figs. 7 and 8 are, respectively, elevation and plan. According to this modification
the teeth, a², are in plan of a fang-like outline, and, preferably, interspaced, as
indicated by the position of the corresponding indentations, a³.
The variant construction illustrated in Figs. 9 and 10 consists in making the
slots, b¹, wider than those illustrated in the preceeding figures, dispensing with
serrated surfaces on face and sides of block, and making the blocks with bolts
and nuts.
A lathe chuck, made as illustrated in these latter figures, is set by
loosening the nuts of one or both jaw and block bolts, c², c³,-if the adjustment
required is only a slight one, to loosen the former will suffice-making the adjust-
ment by means of the set screws, E, and tightening up the nuts again.
We may form the contacting surfaces of the face plate A and washer, f, of a
chuck made according to Figs. 9 and 10, with teeth or fangs of any convenient
shape.
When the turner, after using our chuck, has work given him which requires an
ordinary face plate instead of a jaw chuck, he removes the dogs and blocks from
the chuck, and he has a face plate in which as many slots, g, or similar holes as
will not interfere with the grooves may be formed.
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 face plate, A, having grooves a, and slots 6 formed
therein; with jaws C; and blocks D, with set screws E working therewith; capable
of being adjusted thereon or removed in toto therefrom; substantially as described
with reference to the accompanying figures 1, 2, 3, 4 and 5.
2. The combination of face plate, A, having wide slots, b', rmed therein to
receive the bolts c², c³, of the jaws C, and blocks D; with said jaws C; blocks D ;
and set screws E; substantially as described with reference to the accompanying
figures 9 and 10.
3. The combination of jaw C, its bolt, c, and nut, c¹; block D; set screw E;
groove a; teeth, of any suitable section, a¹; and slot b; substantially as described
with reference to the accompanying figures 1 to 8.
4. The combination of jaw C having a bolt, c, and nut, c¹; block D; and set
E; capable of being attached to a face plate, thereby converting it into a jaw
chuck substantially as described with reference to the accompanying figures.
screw,

page_text: 5: The combination of face plate A, and groove a, having teeth or fangs of any
suitable section, and capable of receiving adjustable jaws of any type, substantially
as described with reference to the accompanying figures.
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Dated 5th day of June 1885.
PHILLIPS & LEIGH;
Patent Agents,
22, Southampton Buildings, Chancery Lane, W.C
Agents for the Applicants.