US1335714A - Expansion-chuck - Google Patents

Description

C. LEA.

EXPANSION CHUCK. APPLICATION FILED DEC. 13, 1918.

Patented Mar. 30, 1920.

2 SHEETS-SHEET I.

Inventor. Ciwzrlas Lew, by M C. LEA.

EXPANSION CHUCK.

A-PPLlCATlON FILED DEC. 13, I918- 1,335,714. I Patented Mar. 30, 1920.

2 SHEETS-SHEET 2.

CHARLES LEA, 0F DORCHESTER, MASSACHUSETTS, ASSIGNOR T0 ANDREW TERKELSEN, OF NEWTON HIGHLANDS, MASSACHUSETTS, AND CARL J. WENNBERG, OF EAST MILTON, MASSACHUSETTS.

EXPANSION-CHUCK.

Specification of Letters Patent. 7

' Patented Mar. 30,

Application filed December 13, 1918/ Serial No. 267,028.

to expansion chucks and has for its object the production of a device of this character which will be simplified in construction and'more efficient in its operation.

The invention consists in providing the head of the chuck with a single immovable member of hardened steel which will-coact with the inner ends of all of the screws of the. chuck and prevent end movement thereof.

.The invention further consists in certain novel features of construction and arrangement of parts whlch Wlll be readily understood by reference to the description of the drawings and to the claims hereinafter given. 7 V V For the purpose of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to' be understood that the variousinstrumentalities of which the invention consists can be variouslyarranged and organized, and that the invention is not limited to the precise arrangement and organization of these instrumentahties as herein shown and descrlbed except as requiredby the scope of the appended claims.

Of the drawings: Figure 1 represents a plan of a chuck embodying the principles of the present inven tion, two of the slides thereof being shown removed.

Fig. -2 represents an elevation of the same,

Fig. 3 represents a vertical section thereof on line 3, 3 on Fig. 1.

Fig. 1 represents a perspective of theinsertedscrew-holding ring, and

Fig. 5 represents an end view of one of the slide-adjusting screws.-

Similar characters indicate like. parts throughout the several figures of the draw- ,ings.

In the drawings, 10 is the head of the chuck having formed in one face, thereof, a

plurality. of radial slots 11, the side walls provided 1' of eachof which are parallel and with a plurality of grooves 12. o Each slot 11 has positioned therein a slidmg member 13, the side walls of which have a plurality of ribs 14: extending into the grooves 12. 1 7

These members 13 are adapted to be moved toward and from the center of the head'lO and the plurality of ribs projecting from the side walls into the grooves 12 retain said members always in the same plane and prevent any lateral movement thereof which would be very objectionable when the chuck is in use.

Each sliding member 13 is provided in its inner face with a threaded recess 15, the threads of each of which engage with the threads of a screw 16,positioned in a semicylindrical recess 17 in the bottom of a slot 11.

Each screw 16 is provided at, its inner end with an annular peripheral groove 18 forming a reduced shank 19 and collar 20. r o

In the rear end of the head 10 is driven an annular member 21 of hardened steel, this member having in its inner end a plurality of semi-cylindrical depressions 22 in each of which is positioned a shank 19 of a screw 16. 1 V

Adjacent to each depression 22, the inner face of the member 21 is flattened at 23 to form a suitable bearing surface for the inner end of the collar 20. 1

The opposite walls of the annular peripheral groove 18 bearing against the inner and outer walls of the annular member 21, prevent any end movement of the screws 16.

When either of these screws 16 are rotated, the threads thereof engaging the threads of the recess 15 in a sliding member 13, will impart end movement to said sliding member, the direction of movement depending upon the direction of rotation ofsaid screw 16.

Itis obvious that the opposite walls of the grooves 18 will take-care of anyend thrust of thescrews 16 as'they are rotated sliding members 13,

Moreover, when grooves are cut'into the screws midway of the threaded portion thereof, the sharp ends of the threads on opposite sides of the groove are liable to cut into the threads of the recess 15-and injure the same.

In the present construction this objection is entirely overcome.

By having a single member, such as the ring or annular member 21, to prevent end movement of all of the screws 16, the construction of the chuck is greatly simplified and a more efiicient chuck may be made at a greatly reduced. cost.

Moreover, as the depressions 22 serve to position the inner end of the screws 16, these SCFJVS will always be maintained. radial to the center of the head 10.

it is obvious also that the depressions 22 may be more readily and accurately formed in the small inserted ring or annular member 21 than they could be formed in the head itself and at less expense. 7

Another advantage in using the ring or annular member 21, is that it may be hardened and thereby out-last con ructions where the end thrust is taken care of by shoulders formed on thehead "l0.

Should the ring become worn or damaged it may be removed quickly and replaced by another without in any manner affecting the other parts of the chuck.

Owing to the reduced number of parts used, the chuck may be more readily assembled thereby saving time and labor.

it is believed that from the foregoing description, the operation and many advantages of the present invention will be readily understood.

Having thus described my claim: 7

1. The combination of a head having in oneface a plurality of radial slots having continuousunbroken walls and provided in its opposite face with a central cylindrical chamber; slide for each slot having a threaded. rec ss formed in its inner faceand invention, I

V novided with a plurality of Work-engaging shoulders on its outer face formed integral therewith; a revoluble screw in each. slot rroacting with the threads of each recess; and an annular member driven into a central chamber in the inner end of said head and coacting with all of said screws to prevent end movement thereof 1n either direction.

2. The combination of a head having a plurality of radlal slots in one face thereof having continuous unbroken walls; a slide for each slot having a threaded recess formed in its inner face and provided witha plurality of work-engaging shoulders on its outer face formed integral therewith; a revoluble screw in each slot coasting with the threads of each recess and provided at its inner end with a flange of less diameter portion. of said and an annular peripheral said flange and the threaded screw; and an annular mem ber driven into the inner end of said head and having in its inner end a plurality of depressions, the walls of each depression coacting with an annular peripheral groove in a screw to prevent end movement thereof in. either direction.

The combination of a head having in one face a plurality of radial slots having continuous unbroken walls and provided in its opposite face with a central cylindrical chamber, each slot being provided with a plurality of grooves in the side walls therethan said screw groove between of; a slide for each slot having a threaded recess in its inner face and side ribs extending into said grooves, said slide also vhaving Japlurality of worloengaging shoulders on its outer face; a revoluble screw in each slot the threads of which extend to the periphery of said head and coact with. the threads of each recess; and a single member fixedly secured in said central chamber and coacting with all of said screws to prevent end movement thereof in either direction.

4. The combination of a head having a plurality of radial slots in one face thereof having continuous unbroken semi-cylindrical bottoms; slide for each slot having a threaded recess in its inner face and a plurality of work-engaging shoulders on its outer face; a member in each slot revoluble in contact with the wall of its semicylindrical bottom and provided with continuous threads extending to the outer end thereof and coacting with thethreads of each recess; and a single member of hardened steel fixedly secured in a central chamber in the inner end of said head and coacting'with all of said screws to prevent both end and lateral movementthereof.

V5. The combination plurality of radial slots aslide for each slot having a threaded recess in its inner face and a plurality of workengaging shoulders on its outer face; a revoluble screw in each slot coacting with the threads of each recess and provided with a flanged head at its inner end ofless diameter thanthe threaded portion of said screw and an annular peripheral groove between said. head and said threaded portion and an annular member secured in a central chamher in the inner end of said head and having its inner end depressions provided with parallel flat bearing surfaces at opposite ends thereof, said depressions coacting with the peripheral grooves to prevent end movement of said screws in either direction.

6. The combination of a head having at one end av cen'ral cylindrical opening and a plurality of radial slots extending from said opening to the periphery of said head and at the other end a larger cylindrical chamof a head having a in one face thereof;

ber; a slide in each slot having a threaded recess 111 its inner face and a plurallty of work-engaging shoulders onlts outer face;

a revoluble screw in each slot coacting with 7. The combination ofa head having at one end a central cylindrical opening and a plurality of radial slots having continuous unbroken semi-cylindrical bottoms extending from said opening to the periphery of said head and at the other end a larger cylindrical chamber; a slide in each slot having a threaded recess in its inner face and a plurality of work-engaging shoulders on its outer face; a revoluble screw positioned in cont-act with the semi-cylindrical bottom of each slot coacting with the threads of each recess and provided with an annular peripheral groove at its inner end; and an annular member secured to said head within said chamber and having at its inner end depressions, the walls of which are positioned in said annular grooves. r

8. The combination of a head having in one face thereof, a central opening and a plurality of radial slots extending from said opening to the periphery of said head and each having a semi-cylindrical bottom of the same diameter throughout the length of said slot; a revoluble screw in each slot of the same diameter as the semi-cylindrical bottom of said slot and provided with a reduced inner end having an annular groove therein; a slide in each slot having a threaded recess in the inner face thereof the threads of which coact with the threads of said screw; and an annular member driven into said opening and provided with de-. pressions in the inner end thereof, the walls of which are positioned in said annular grooves and prevent said screws from moving endwise. v

9. The combination of a head having in one face thereof, a central. opening and a plurality of radial slots with cal bottoms of the same diameter throughout their length and extending from said opening to the periphery of said head, which head is provided with a cylindrical chamber in the opposite face thereof; a' revoluble screw in each slot of the same diameter as the semi-cylindrical bottom of said slot and provided with a reduced inner end having an annular groove therein; a slide in each slot having a threaded recess in the inner face thereof, the threads of which coact with the threads of said screw; and an annular mem ber driven into said cylindrical chamber and provided with depressions in the inner end thereof, the walls of which are positioned in said annular grooves and prevent said screws from moving endwise,'the interior diameter of said annular member being greater than the diameter of said central opening.

Signed by me at 4 Post Office I CHARLES LEA. I \Vitnesses:

l VALTER E. LoMBAnD, i MAZIE W. KIMBALL.

semi-cylindri- Square, Boston, Mass, this 12th day of December,

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