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Oct. 11',‘ 1960 E, F. VILTER ' _ 2,955,830 > COLLET CHUCK ' Filed_0ct. 20, 1958 2 Sheets-Sheet 1 é ' ' /z k\\\\\\ INVENTOR ERNEST F.VH_(TER ‘ . ATTORNELSH Oct. 11, 1960 E. F. VILTER 2,955,830 COLLET CHUCK Filed Oct. 20, 1958 2 SheVets-Sheet 2 5 92 a : | 1/4 \ \\ \ \ 27/ {(8 /‘I' /5_ \\\ \ \ \\ \ _ I ‘w 30 . 3| ' z! 5}<— ' / "’. ® \ 4 INVEINTOR ERNEST FNV l LT ER ATTORNEYS 2,955,834? United States Patent G 1C6 Fatented Oct. 11, 1960 1 2 direction of the arrows and illustrating more particularly the pusher collar; Figure 4 is a view similar to Figure 1 but showing a 2,955,830 slightly modi?ed form of my invention, the section being taken on the line 4-4 of Figure 5, looking in the direc coLLET CHUCK tion of the arrows, and Ernest F. Vilter, 4161 N. Richards St., Milwaukee, Wis. Figure 5 is a transverse sectional view through the modi?ed form of the chuck taken on the line 5-5 of Filed Oct. 20, 1958, Set. No. 768,484 Figure 4, looking in the direction of the arrows. 8 Claims. (Cl. 279-58) 10 Referring to the drawings in detail, wherein similar ref erence characters designate corresponding parts through out the several views, the letter C generally indicates my improved chuck for use in conjunction with a hori zontal turret lathe. As the lathe is of conventional con This invention appertains to chucks and more particu 15 struction and forms no part of the present invention, larly to work holding chucks of a type particularly use the same has not been illustrated in detail, but the same ful in connection with horizontal turret lathes. includes the usual spindle nose 5 and the longitudinal In all chucks, with which I am familiar, after the ad movable closer tube 6. justment of the stock or work relative to the operating The chuck C includes an adapter collar 7 which is tool or tools and upon the tightening of the collet by 20 secured to the spindle nose 5. As illustrated, the spindle the pulling back thereof, the stock or work is moved nose 5 is provided with external threads 8 for receiving back a slight fraction of an inch by said tightening caus the adapter collar 7. The chuck includes the body. 9 ing an undesirable variation of a certain number of and this body is securely fastened to the collar 7, by thousandths of an inch from the proper setting of the machine screws 10. The forward end of the chuck body work or stock. 25 9 carries the adjusting nut 11 which bears against the It is, therefore, one of the primary objects of my inven internally tapered closer ring 12. This closer ring may tion to provide a novel chuck which will correctly hold or may not be split. The closer ring 12 snugly receives the work or stock in its adjusted position without varia an externally tapered resilient collet 13. The collet 13 tion upon the closing or tightening of the chuck or it can be formed from rubber or some material capable collet. 30 of being compressed longitudinally and contractable cir Another salient object of my invention is the provision cumferentially. The collet is preferably of the well of the use of a novel fulcrum washer housed within the known “Jacobs” type, i.e., formed from a plurality of chuck body and interposed between a pusher collar for rubber segments and staggeredly arranged radial plates. a resilient collet and a fulcrum rib in the chuck body, The collet extends slightly inward of the closer ring and the inner peripheral edge of the fulcrum washer being 35 its inner face is provided with a tapered seat 14, for a engaged by the closer tube, so that upon rearward clos purpose, which will later appear. ing movement of the tube, the washer will be ?exed ‘or ‘ The chuck body 9 is provided with an internal annular rcoked on said fulcrum rib to cause forward movement enlargement for snugly and slidably receiving the sleeve of the pusher collar and the compression of the collet 15 which forms a continuation of the draw tube 6. The longitudinally in the internally tapered closer ring, and 40 inner end of the sleeve 15 can be externally threaded, the contraction of the collet circumferentially to cause as at 16, ‘for connection with the tube 6, so that the the same to effectively grip the work or stock without sleeve and tube will move as a unit. In order to prevent longitudinal movement thereof. turning movement of the sleeve‘ 15, the same is provided A further important object of my invention is to pro with a key slot 17 and a set screw 18 is threaded into vide a fulcrum washer for a chuck formed from a plu the chuck body 9 and into the key slot. The extreme rality of independent rockable segments or an integral forward end of the draw sleeve 15 is provided with a flat body weakened to'permit its rocking on an ‘annular radially extending annular ?ange 19 for operative con~ fulcrum rib when pull is exerted in a desired direction nection with a fulcrum Washer 20‘. on its inner peripheral edge. The fulcrum washer 20 forms an important part of A still further object of my invention is to provide a 50 this invention, and the same is ?tted within the chuck chuck of the above character which can be utilized on body 9 inward of the resilient collet 13. The inner a conventional horizontal turret lathe which will be dur surface of the chuck body 9 forward of the annular able and efficient in use, one that will be simple and internal enlargement is provided with a smooth bearing easy to manufacture and one which can be placed upon face for the washer and for the closer ring 12. This the market at a reasonable cost. 55 washer can be formed, as shown, from ?at stock, prefer With these and other objects in view, the invention ably of a resilient nature and to facilitate the ?exing consists in the novel construction, arrangement and for thereof, for a purpose which will later appear, the same mation of parts, as will be hereinafter more speci?cally is provided with radially extending slots 22. The slots described and claimed, and illustrated in the accompany extend inward from both the inner and outer peripheral ing drawing, in which drawing, 60 edges of the fulcrum washer. Figure 1 is a longitudinal sectional view through my Formed on the forward face of the internal annular improved chuck showing the same on the spindle nose venlargement of the chuck body 9 is an annular fulcrum of a lathe, and connected with the draw tube of the rib 23 and the fulcrum washer rests against this rib at lathe, the spindle nose and the tube being shown in longi a point substantially equidistant between its inner and tudinal section; 65 outer peripheral edges. Figure 2 is a transverse sectional view through the As best shown in Figures 1 and 2, the annular ?ange chuck taken on the line 2-2 of Figure 1, looking in the -19 on the pusher sleeve 15 engages the front face of direction of the arrows and showing more particularly the fulcrum washer adjacent to its inner peripheral edge. one preferred form of the fulcrum washer; The fulcrum washer adjacent to its outer peripheral 70 edge engages an annular pusher collar ‘24. The forward Figure 3' is a transverse sectional view through the face of the pusher collar is preferably tapered inward chuck taken on the line 3-3 of Figure 1, looking in the ly, as at 25, and fits snugly against the seat 14 formed 2,955,830 A 3 A on the resilient collet 13. The inner face of the pusher collar adjacent to its outer peripheral edge, and said collar 24 is provided with an annular ?ange 26 and the ?ange engaging the fulcrum washer adjacent to its in fulcrum washer bears against this ?ange. ner peripheral edge, whereby upon inward sliding move ' In operation, the lathe is utilized in the normal way ment of the closer tube the washer will be rocked inter and the stock is ?tted within the collet 13 and may or may mediate its inner and outer peripheral edges to force the not extend into the draw tube 6 and sleeve 15. The pusher collar against the resilient collet. stock’ is adjusted within the collet to the correct desired 2. A chuck for holding stock ‘on the spindles of lathes position relative to the operating tool (not shown), and comprising a body for connection with a lathe spindle initially held by the adjusting nut 11-. After proper ad‘ and said body having an internalannular enlargement jus'tment of the ‘stock, the draw tube 6 is pulled back 10 forming a guide, a closer tube slidably mounted in‘the carrying the sleeve 15 therewith. The ?ange 19 of’ the guide having at its forward end an annular outstanding sleeve 15 engaging the peripheral edge'of the fulcrum ?ange, a closer ring slidably mounted in the body hav washer 20 pulls back on the washer rocking the washer . ing an internally tapered seat, a resilient collet received on‘ the fulcrum rib 23. V This exerts ‘a forward movement within said seat and said body, an adjusting nut threaded on the fulcrum washer at its outer peripheral edge caus on the body and engaging said closer ring for adjusting ing a.