Патент USA US2061321код для вставки
‘ Nov. 17,- 1936. ‘ H H KNOTT ~ 2,061,321 CHUCK CONSTRUCTION Filed Dec. 4, 1934 : ‘ v 22321456“ ‘£5 // v _ ' 1 > 1 15;; 650.14 ,' p// ' _ ik’cjmc/w . ‘ 2,061,3Zl Patented Nov. 17, 1936 ATENT OFKQE UNITED STATES 2,061,321 CHUCK CONSTRUCTION Harry H. Knott, Washingtomlowa, assignor to American Pearl Button 00., Washington, Iowa, a corporation of Iowa Application December 4, 1934, Serial No. 755,900 4 Claims. (Cl. 279-51) On the accompanying drawing, I have used An‘ object of‘ my invention is to provide a chuck for button blanks or the like, the chuck being comparatively inexpensive to manufac ture and simple in its construction. More ‘particularly it is my object to provide a chuck construction especially adapted for hold ing button blanks or‘ other semi-fragile elements in such manner that the possibilities of chipping the edges of the blank are minimized and also the 10' tendency for the blank to spring out of the chuck is minimized; Still another object is to provide a spindle likev chuck element of the split contractible type with a removable element for engaging the but 15 ton blank or. the like in such manner that it is ?rmly held without danger of chipping. Still another object is to provide a split chuck with an annular groove with which a resilient contractible ring may be associated so that the ring itself rather than the metal of the chuck will engage the edge of a button blank’ or‘ the like to hold itwhil'e performing operations thereon. A further object is to provide a removable blank engaging element and a method for re 2,5‘ newing it, which method is simple and quick to perform. With these and other objects in view my in vention consists in the construction, arrange _ ment and combination of the various parts of my “ device, whereby the objects contemplated are at tained', as hereinafter more fully set forth, point ed out in my claims and illustrated in the ac companying drawing, in which: Figure 1 is a plan View of a chuck construction embodying my invention, showing the button blank received therein. Figure 2 is a. vertical sectional‘ view on the line 2-—2 of Figure 1 showing a blank. being held in the chuck and a tool being used on the blank. Figure 3 is a, separated perspective view of‘ my chuck construction comprising a spindle-like chuck element and a renewable resilient blank engaging ring. Figure 4 is a plan view showing the ring in 45 position and partly split according to my method for renewing the ring. Figures 5 and 6 are enlarged sectional views on the lines 5-—5 and 6—6 respectively of Figure 1, illustrating the action of the resilient ring of 50 my chuck. Figure '7 is a plan view of a conventional chuck; and Figure 8 is a side elevation of another form of chuck including my invention, part of the chuck 55 being broken away. the reference character A to indicate generally a spindle-like chuck element and B a resilient ring for association therewith. The chuck A has, as shown in Figure 3, a shank It provided with a cone-portion l2 and an enlarged head it. The head M has therein an annular groove l6 ter minating in an outer supporting flange Ill. The chuck is split twice at right angles to each other, they split spaces being indicated at 20. The ele ment A with the exception of the groove l 6 is now in general use and one of such chucks is shown in Figure 7 as A’, the parts thereof cor responding to the chuck A, having the same ref erence numerals with the addition of the dis tinguishing characteristic “a”. The chuck A’ is shown as having a button blank 0 therein. These blanks are not always perfectly round and the out-of-roundness of the blank C has been exaggerated in Figure '7 so 20 that it contacts at but three points a with the chuck A’. Exaggerated spaces 1) are illustrated which in actual practice may be only one or two thousandths of an inch, but nevertheless since the ?ange l8a is non-resilient and the blank it 25 self is non-resilient, there will be no engage ment at these points, so that the blank is en gaged at but a very small percentage of its pe riphery. Accordingly, when a tool, such as a grinder, shown at 22 in Figure 2, is used on the blanks many of them are chipped on the edges and‘ some of them spring out hi the chuck. Chipped blanks, of course, are unusable and there is therefore considerable waste experienced. By providing the annular groove Hi to receive 35 the resilient ring B as is obvious from an in spection of Figure 3 I am able to overcome the difficulties enumerated in connection with the chuck A’ in Figure 7. The ring is of slightly greater cross sectional thickness than the width of the groove, as is evident from Figure 5, so that it mustv be forced into. the annular groove and will accordingly be retained there by its tendency to re-expand to its original thickness. After it is forced into the groove a saw or other cut 45 ting tool is run through the split spaces 20, the vertical one of which has been so sawed through as illustrated in Figure 4 and the horizontal one being now ready for sawing through. 50 The method of installing the ring just described facilitates the installation because it is easier to force the entire ring into the groove than to force individual segments of the ring into the individual segments of the chuck and. get the two in proper 55 2 2,061,321 relative alignment. The job can be done in less than half the time by this method. taken out and a new ring B inserted and sawed After the ring segments, which are designated by the reference numeral 24, have become too bad ly worn for further service, they can readily be dug out of the groove segments for the purpose of inserting another ring as just described. necessary. The same out-of-roundness blank C is shown engaged by the chuck A of Figure l as was illus 10 trated in Figure '7. It will be noted that the segments 24 conform to the shape of the periph ery of the blank, the sectional Figures 5 and 6 showing respectively relatively loose (yet ?rm) and tight engagement of the same points on the periphery of less than greater radii respectively. Even where the edges of the blank are relatively loosely engaged as in Figure 5, there would be a slight over-hanging, as indicated at 2B, of‘ the upper edge of the segment 24 with respect to the button blank, this deformation of the segment insuring against the button blank ?ipping out of the chuck when a tool is used on the blank. The ?ange segments l8 back up the segments 24 and serve as supports counteracting the tendency for the blank to enlarge the blank-engaging seg ments 24. Heretofore. with all metal chucks the ?ange segments l8 received considerable wear and after ,‘a few months’ service the chuck A had to be 30 thrown away, as it would no longer hold the blanks. With my removable insert ring B, how ever, it is merely necessary to take a few minutes’ time to renew this element which is very inex pensive and the metal portion of the chuck can to Q1 thus be used repeatedly for an inde?nite length of time. This obviously effects a considerable econ omy over the old method. The chuck A is ordinarily used in a drill press type of button blank machine. Some of the con 40 veyor types have chucks such as shown in Figure 8, except that they are all metal and do not include the annular groove I6 and the resilient segments 24, which I have already described. The chuck in Figure 8 is indicated generally by the refer ence character A" and is of shaft-like construc through, as has been already described, whenever From the foregoing description it will be obvi ous that I have conceived a novel and economical means for removing the blank engaging element on a button blank chuck or the like and that such element is far superior to the all metal chuck now in general use. Although I have described the ring B as being resilient, it is obvious that 10 the degree of resiliency may vary greatly, depend ing upon the material used to form it. I have found rubber quite satisfactory, although of course, other materials would be suitable. Also, the rubber may be hard or soft as required and 15 a change of this character, as well as others, may be made without departing from the real spirit and purpose of my invention, and it is my inten tion to cover by my claims any modi?ed forms of structure or use of mechanical equivalents, which may be reasonably included within their scope. I claim as my invention: 1. In a button blank chuck, a spindle-like chuck element, said element being split into a plurality of parts whereby said parts may be sprung toward 25 each other, an annular groove in an end of said chuck element, a supporting ?ange outside of and projecting beyond said groove and a resilient but ton blank engaging ring partially in said groove and partially against said ?ange, said ring being 30 split coincident with the split spaces of said chuck element. 2. In a button blank chuck, a spindle-like chuck element, said element being split into a plurality of parts whereby said parts may be sprung to 35 ward each other, an annular groove in an end of said chuck element, a supporting ?ange beyond said groove and a resilient button blank engaging ring partially in said groove and partially against said ?ange. 40 3. In a chuck construction, a spindle-like chuck element having a depression in one end thereof and an annular groove surrounding said depres sion, an annular ?ange surrounding said groove on a cam track (not shown) which at the proper and extending beyond the bottom of said depres 45 sion and a resilient blank engaging ring partially in said groove and partially against said ?ange, said chuck element comprising a plurality of parts movable toward each other for contracting said time raises the chuck, causing the cone lZa to engage a reduced portion of the bore in which the chuck is mounted (not shown) for contracting the chuck. The chuck A is contracted by the cone ring. 50 4. In a chuck construction, a spindle-like chuck element having a depression in one end thereof and an annular groove surrounding said depres [2a similarly engaging a part of the machine when the chuck is moved downwardly. Chucks such as A” of Figure 8, when made of all metal, must have their upper ends turned down sion, an annular ?ange surrounding said groove and extending beyond the bottom of said de 55 pression and a resilient blank engaging ring par tially in said groove and partially against said ?ange, said chuck element comprising a plurality of parts movable toward each other for contract— ing said ring, said ring comprising a plurality of 60 parts one for each part of said chuck element. tion, similar to the chuck A, but having a taper I2a reversely arranged. On the lower end of the chuck, a thrust ball 28 is provided which travels occasionally as they wear away. The chuck must then be lengthened so as to retain its original GO length in the machine for proper operation. All of this takes considerable time and skill, whereas with my invention the chuck A" can remain in its original dimensions, the segments 24 being HARRY H. KNOTT.