US6046A - Chuck for lathes - Google Patents

Description

IfUNITEDs'rams APATENT oFFicE.

WILLIAM GRANT,V OF BOSTON, MASSACHUSETTS CHUCK FOR LATI-IES.v

Specication of Letters Patent No. 6,046, dated January23,-1849.

To all whom t may concern Be it known that I, VILLIAM GRANT, of

Boston, in the county of Suolk and State of Massachusetts, have invented a new and useful Self-Oentering Universal Chuck, of which the following is a full and exact description, reference being had to the annexed drawings of the same, making part of this specification, in which- Figure l is a perspective lview of the chuck, showing the face plate, jaws, and adjusting screws, Fig..2 is a view of the back part of the chuck, the face plate being removed to show the manner in which the connecting rods join the jaws to the turning disk, and one of the modes in which the disk and jaws are simultaneously moved, Fig. 3 is a view of the back plate, the turning disk, connecting rods, jaws, and face plate being removed therefrom,\Fig. 4- i'sa view. of the chuck inoperation having a crank secured upon it, for the purpose of having its eye bored out, Fig. 5 is a section parallel to itsl axis, and Fig. 6 is a wrench for turning the screw which operates the jaws.

The same letters indicate the same parts in all the figures.

One of the peculiarities of my chuck is, that without being made proportionately more ponderous than the rest of the lathe i-t will,be quite las strong, and as free from liability to be broken. Its face plate can be slotted like the ordinary 'chuck plate, and irregular bodies whose centerof gravity is eccentric to its center, can be chucked there-V on with the utmost security by stirrups and T headed screw bolts, and heavybodies of any description when centered by the jaws,

may be secured by stirrups and bolts in the ordinary way, to take off the strain from the jaws. This chuck possesses all the advantages of the spiral screw chuck without any of its defects, does not cost half as much, and when of the same strength does not weigh so much by fifty perl cent. besides being so simple in its structure that -any machinist can, with common tools make or repair it, whereas the spiral chuck can only be made or repaired by the original manufacturer, who has costly machinery pre-4 pared for the express purpose of making them, and without which they cannot be made at any moderate cost.

In the accompanying drawings (A) is a common chuck plate having three radial slots a in which .the jaws (B) slide, and. numerous other holes and slots b for the stirrup vbolts to pass through, this plate j which an annular disk is accuratelyv fitted, but not too tightly to admit of its turning freely. Upon the face of this disk a series of wrist pins in number corresponding with the Ajaws Vare placed,`an

other similar series of pins project from the under side o-f the jaws, and these pins pass through the ends of the vconnecting rods (E) joining the .jawsand disk (D) so that any one of the jaws being moved will turn the disk and move all the rest of the jaws at the same time through the same space.

The plates being concentric withv each other,

and the connecting rods (E) of uniform length it follows that the jawswill at all times be concentric with t-he plates;

The jaws are moved 'toward o-r from the center by a screw (F) passing through one .of them, oracting at a tangent upon the disk (D).

It is obviousthat there are various methods in which these screws may be arranged, but as they are merely t-he appli` cation of devices commonly known. and well understood it is unnecessary here to describe them. The disk (D) may be dispensed with andcranks or a` system of levers and con.

necting rods substituted therefor, this aru rangement would no-t however change the principle upon which the aws are moved.

The jaws are dove-tailed or otherwise secured into the slots a and all the surfaces of these jaws, yas well asthe other parts that slide in contact are well fittedA and polished, the connecting rods, wrist pins, jaws, and

set screws, I prefer to make of steel, with the joints tempered very hard to prevent their wearing rapidly, and getting out of order, the remainder of the parts it is best to make of cast iron.

The operation of this chuck is the same as thatV of alll others made upon the adjustable,

self centering principle, and will not there- A fore require a detailed description.

Having thus described the construction of my universal self centering chuck, what I claim therein as new and desire to secure by Letters Patent, is-

The combination of the connecting rods and jaws jointed together and moving simul-` taneously by means of a screw or otherwise, with the chuck plate; whether the several parts be made and arranged as hereinv set kkforth, or in any other substantially similar manner by which the jaws are moved to 10 ward or from the center oit' the` plate at the same time, and at equal speed.

In testimony whereof I have hereunto set my hand this 11th day of October 1848.

Y WM. GRANT. Witnesses:

WM. D. WASHINGTON, P. H. WATSON.

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