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Publication numberUS2403136 A
Publication typeGrant
Publication dateJul 2, 1946
Filing dateAug 17, 1944
Priority dateAug 17, 1944
Publication numberUS 2403136 A, US 2403136A, US-A-2403136, US2403136 A, US2403136A
InventorsStoner Arthur Merrick
Original AssigneeJacobs Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Collet
US 2403136 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

July 2, 1945. M R 2,403,136

COLLET Filed Aug. 17, 1944 INVENYI'OR' 71607 Mamie/r .1702? ATTO R N EY Patented July 2, 1946 UNITED. STATES PATENT OFFICE Arthur Merrick Stoner, West Hartford, Conn, assignor to The Jacobs Manufacturing Company,

Hartford, Conn., a corporation of Connecticut Application August 17, 1944', Serial No. 549,847

This invention relates to a collet of novel structure which is of simple inexpensive construction and has many advantages over such' devices as have been available heretofore.

The object of this invention is to improve upon the devices shown in my Patent No. 2,346,706, issued April 18, 1944, and on those shown in my co-pending application, Serial No. 521,097, filed February 4, 1944.

More specifically, its object is to provide a collet of the type shown in the aforesaid patent and application in which the rigid gripping members are inserted in a resilient retainer molded to receive them, with attendant advantages which will appear in the following specification.

Referring to the drawing:

Fig. 1 is a sectional side elevation of a collet which is made according to and embodies my invention.

Figs. 2 and 3 are transverse sectional elevations of the structure shown in Fig. l,- the sections being taken respectively on the lines 2-2 and 33 of the latter figure. s

Fig. 4 is a side elevation of a body of resilient material which forms a part of the collet illustrated in the preceding figures.

Fig. 5 is a front elevation of the body shown in Fig. 4 with a part broken away and shown in a section taken on the line 55 of Fig. 4.

Figs. 6, 7 and 8 are sectional elevations of a part of resilient bodies of modified forms. The position of one of the gripping members is represented in these figures in dotted lines.

Fig. 9 is a central sectional side elevation of a chuck of which a collet of the novel construction disclosed herein is a part. This figure is included to show a way in which the collet may be used.

The collet comprises a plurality of gripping members 10 of rigid material, such as hardened steel. These are angularly disposed about a common axis A-A with their inner edges 1 I equidistant from and parallel therewith. Their forward ends may be chamfered as at I2. A notch I3 is cut in the inner edge of each of the gripping members intermediate its ends. I4, l5 designate spaced perforations through the gripping members. The major portion of the outer edges I6 are beveled and lie in a frustroconical surface. The rear end of the gripping members is designated by the numeral H.

20 is a retainer in the form of a hollow externally tapered body of resilient material, such as oil resistant synthetic rubber. This is molded with radially disposed longitudinal slots 2| for receiving and positioning the gripping members.

4 Claims. (01. 279-44) The slots extend through the body. except for portions 22 across the bottoms of the slots; The longitudinal width of the portions 22 corresponds to that of the notches l3 and they have preferably a cross-sectional form to fit these notches. The inner and outer surfaces of these portions are substantially circular but between them longitudinal. grooves 23 are formed in theinner surface of the retainer to facilitate the folding operation of the'parts of the body between adjacent gripping members which is particularly described in the aforesaid application Serial'No. 521,097.

Bosses 2E and 25 project inwardly in mutual alinement from opposite sides of'the slots 2|. The rear end of the body is designated by '26 and its front end by 21.. a

In assembling the collet the body is bent to spread the bosses 24, 25 apart sulficiently to permit the gripping members III to pass them. The gripping members are inserted with their notches straddling the portions 22 of the body. Then when their inner edges II are moved into parallelism with the axis A-A, the perforations I4 and [5. are in alinement with the bosses 24, 25 and when the body is allowed to resume its normal position the bosses enter the perforations from opposite sides of the gripping members and hold the latter in desired positions.

The chuck shown in Fig. 9 comprises a hollow body 30, the rear portion of which is threadedat 3| for attachment to a machine tool. Theforward portion of the body is internally threaded, as at 32. A transverse abutment 33 is formed back of this internally threaded portion.

The rear ends I! of the grip ing members of the collet are seated on the abutment surface 33. 34 is a pressure member externally threaded to fit the threads 32. This memberhas a conical cam surface 35 having an angularity which corresponds to that of the outer edges N5 of the gripping members and is adapted to engage these edges. When the pressure member is screwed into the body 30, the gripping members are forced inwardly. It will be noted that all sides of the gripping members extend beyond the corresponding sides of the resilient body 20 so that clearance spaces are provided to allow for the displacement of the body 20 when the gripping members are forced inwardly.

In the modification illustrated in Fig. 6, an elongated lug 24A is shown instead of the bosses 24, 25. Openings of similar size and shape are with this construction provided in the gripping members. The portions 22A are symmetrically disposed in relation to the lug 24A.

ter is reversed as shown at IDA in Fig. 8 and the frustro-conical interior.

If desired the gripping members may be ce mented or otherwise affixedtothe body: I

Various modifications in construction, mode o operation, method and use of an invention may and do occur to others, especially after benefitting from knowledge of such a disclosure as that herein presented of the principles involved, but the invention itself is not confined to the present showing. t g

'Iclaim:

l. A circumferentially continuous machine tool collet to be actuated by a cam surface of a chuck,

said collet comprising a retainer in the form of a body of resilient material having a central 1ongitudinalopening and having a plurality of ang'ularly spaced radially disposed slots extending from said opening to the outer periphery of the body, said slots being open at one transverse edge and open at the other transverse edge throughout the major portion of the length of the body and portions of the body across one of the trans- :verse edges of the slots intermediate the longitudinal ends of the body closing short parts of the slots, and alined bosses spaced from said portions of the body, projecting from the sides of the slots, and rigid gripping members in the slots having tapered edges projecting from the body and arranged to be engaged by said cam surface,vnotches in the opposite edges of the gripping'members engaging the portions of the bodywhich are across the slots, said gripping members being provided with orifices for receiving the lugs. 1

' 2'. A circumferentially continuous machine tool collet to be actuated by a cam surface of a chuck, said collet comprising a retainer in the former a tudinal opening and having a plurality of angularly spaced radially disposed slots extending from said opening-to theouter periphery of the body, said slots being'open to said periphery and open at their inner edges throughout the major portion of the length of the body and portions of the body across the inner edges of the slotsintermediate the longitudinal ends of the body closing body 20A made with a cylindrical exterior and a vcollet to be actuated by a cam surface of a chuck,

said collet comprising a retainer in the form of a body of resilientmaterialhaving a'central longitudinal opening and having a plurality of angu- 'lar1y spaced radially disposed slots extendin body of resilient material having a central longifrom said opening to the outer periphery of the body, said slots being open to said periphery and open at their inner edges throughout the major portion of the length of the body and portions of the bodyacross the inner edges of the slots intermediate the longitudinal ends of the body closing short parts of the slots, and alined bosses longitudinally spaced and laterally offset from said portions of the body, projecting from the sides of the slots, and rigid gripping members in the slots having tapered outer edges projecting from the body and arranged to be engaged by said cam surface, notches in the inner edges of thegripping members engaging the portions of the body which are across the slots, said gripping membersbeing provided with orifices for receiving the lugs.

4. A circumferentially continuous machine tool collet to be actuatedby a cam surface of a chuck, said collet comprising a retainer in the form of a body of resilient material having a central longitudinal opening and having a plurality of angularly spaced radially disposed slots extending from said opening to the outer periphery of the body,

said slots being open to said periphery and open at their inner edges throughout the major portion of the length of the body and longitudinally spaced portions of the body across the inner edges of the slots intermediate the longitudinal ends of the body closing short parts of the slots, and alined bosses longitudinallyv spaced and laterally ofiset from said portions of the body, projecting from the sides of the slots, and rigid gripping members in the slots having tapered outer edges projecting from the body and arranged to be engaged by said cam surface, longitudinally spaced notches in the inner edges of the grippin members engaging the portions of the body which are across the slots, each of said gripping members being provided with an orifice for receiving the lugs.-

ARTHUR'MERRICK STONER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2534616 *Dec 29, 1948Dec 19, 1950Milligan Fletcher FCollet with work grippers
US2788216 *Oct 28, 1955Apr 9, 1957Oster Mfg CoChuck jaw with self-tightening work gripping head
US2817532 *Oct 20, 1955Dec 24, 1957Woodworth Co N AExpansion arbor with inclined flats
US2835496 *Mar 29, 1955May 20, 1958Teller B HallCollet construction
US2844377 *Sep 30, 1955Jul 22, 1958Baker Raymond JackChucks with jaws connected together by rubber bonded thereto
US2896954 *Nov 16, 1955Jul 28, 1959Ernest Frederick IWork mounting chuck
US2994992 *Oct 3, 1955Aug 8, 1961 Radius grinding machine and spindle
US3025646 *Nov 30, 1960Mar 20, 1962Earl A ThompsonSpindle
US3987549 *Oct 6, 1975Oct 26, 1976Lawrence Peska Associates, Inc.Dental prophylactic handpiece
US6520508 *Aug 30, 2000Feb 18, 2003Jordan Manufacturing Solutions, Inc.Keyless router chuck
Classifications
U.S. Classification279/54, 279/46.7
International ClassificationB23B31/20
Cooperative ClassificationB23B31/202, B23B2226/33, B23B2231/2075
European ClassificationB23B31/20B1