US1880521A - Bit or drill holder - Google Patents

Description

0d 4, 1932- A. l.. sToWELL BIT OR DRILL'HOLDER Filed Sept. l5, 1929 A A A A Patented Oct. 4, 1932y vUNIrED STATES iinsTIN I.. sToWELL, or NEW BRITAIN, CONNECTICUT, AssIGNon. To 'TnnsTANLEY wonxs; or NEW BRITAIN, CoNNECTicUnACORPORATION or CONNECTICUT ,A

BIT 0R- DRILL HOLDER i Application filed September 13, 1929. SeriaLNo, 332,344. j

rl`his invention relates to holders or chucks particularly adapted lfor use on braces or bit stocks. Certain features of 'the present invention relate to a chuck of the type havthe shank "is inserted into the chuck. The

chief disadvantageof a chuck of this type resides in thespring construction as heretofore -made, that construction, as shown in said Parker patent, including a collar of substantial size and to which the spring arms are "connected The collar, which has been a closed ring, must fit reasonably vclose tothe stem` or turned-down portion of the chuck body leaving but a very Ynarrow space therebetween in which dirt and rust are not only likely but very liable to 1 gather so that the collar'will not readily slide on the s'tem with that degree of freedom which is necessary to' a properly operatingchuck. Also,

the spring'meansshown in said Parker patent is' somewhat expensive to make, the springs are liable to become loose, and :the

, spring means cannot be replaced without taking the chuck apart. Y Y

` An aim of the present invention is to provide, in a chuck of this sort, improved spring means for normally urging the.- jaws apart whichis not open to the above and other objections incident to the arrangement shown in Vsaid Parker patent.

i More particularly, aims ,of the'invention lare to provide, in `a chuck of this character,

an improved spring which is Vnot likely or liableto stick due to the collection of dirtV Aor rust V-between the connecting portionvof the spring andthe stem on whichit slides so that thespring `means will always; operateY freely even after the chuck lhas been in use for a considerable length. of time; to provide an improved arrangementV which will'permit of ready replacement of the spring means withouttaking the chuckapart from the rest'of the mechanism; to provideV improved spring means which is extremely simplein construction and whichcan be lmade very inexpensively; to provide improved'spring means in which any likelihood of the Vspring arms becoming loose or. displaced relative to one another orto the connecting portion is entirely eliminated; and to provide an improved arrangement which will permit of'shortening of the lengths ofthe steel parts of the chuck, except thejaws, so that a'` more compactv and lighter,construe tion is obtained, together with al saving in material and labor in manufacture'.

Thevinvention further relates tofan im- Vproved ball bearing, arrangement which may rbe used, for instance, for preventing" relative laxial movement between'the sleeve and ythe nose piece .but which willpermitthe sleeve to be moreeasily rotated so thatv the jaws may be more tightly clamped against the tool withv less effort..` Heretofore, it has been the practice -to providel a separate nose ringvsesembly, and the screws not infrequently bef-V come loosened and displaced. accordance with the present invention, improved means of a 'simplified and economic naturefare pro'- `vided for readily and' effectively closing the opening 'leading to the ball raceways. My

improved-means may be very readily 'assem fbled anddisassembled, whilethere is no like- Ali'hood of the same becomingaccidentally dis- Placed. 1. y i i Other'objects will be in part obvious and :cured to the sleeve proper by means of a screw Y and 'to interpose the anti-friction balls bein part pointedfout more in detail hereinafter..

- plug is held in place.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the applicationof which will be indicated in the appended claims.

In the accompanying drawing, wherein I have shown, for illustrative purposes, one emboltliment which the present invention may ta e:

Figure 1 is a side elevational view of the chuck;

Fig. 2 is a central longitudinal section therethrough; f Y

Fig..8 is a view showing, in elevation, the jaws and the spring means for urging-the jaws apart; Y f

Fig. 4 is'an elevational view of the sleeve; Fig.` 5 is an elevational view of the chuck body, one of the jaws and the spring mea-ns;

Fig. 6 is a view looking at the forward end of the chuck body, the spring means being shown in dotted lines; v

Fig. 7 is a perspectiveview o f aring for yholding inplace the plug for the loading hole;

Figs. 8 and 9 are face and edge views, respectively, of the plug member; and

i Fig. 10 is anenlarged detail view showing,

in section, the mannerpin which the loading hole is plugged and the manner which the YIn l the, accompanying drawing,A have shown my improvements incorporated in a chuck having` a'chuck body and jaws ofan old and wellknown.constructionfbut it is to be understood that this disclosure is byk way of illustration only, it being obvious that my improvements may be incorporated in chucks `constructed other than that herein disclosed. Theletter A denotes Ia chuck body provided with anexternalthread 10 and a reduced or turneddown stem 11. The outerl end ofthe bodygis hollowed out and is provided at each sidewitha'notch 12 so as to accommodate the rear ends of the jaws.. Also, at each side of the chuck body and leading from the bases of the notches 12 to the stemV 11, is a longitudinally extending groove 13 for accommodating the arms of the spring. B, B denote the jaws which, as stated, may be of any suitable construction. The nose piece is indicated by the letter C, and. the sleeve by the letter D, thelatter having an internalthread 14;adap t edito receive the thread 10vso that, whenthe sleeve is rotated,it, together with the nose piece C, is advanced or withdrawn longitudinally depending. on the direction-of rotation of the sleeve.

'In accordancewiththe present invention,

25,25 and a connectingv portion26,-'tl'1e'connecting portion extending but partially section., The free endsof the arms are turned-outwardly, asiat 27 so thatI they may be removably engaged with the jaw members in the usual and well-known manner shown i-n Figs; 2 and'3; ltawill lbeobserved 4that the .semi-circular connecting portion 26 Lof tliei Y spring wire lits against and is adapted-t Vfreely slide along the stem 11, and the arnis25 are free to slide in thegrooves 13 whenthe'jaws are moved with respect to the chuck body. `Since* thelconnecting portion26- between the arms istas compared vto ,thering or collarto `which the.- spring arms have heretofore been connected) arelatively small incross section and .has not a rigid relationA with respectto the Ystem 11, thereris noilikelihood or possibility .of the connecting portionsticking or becoming wedged ory clogged due to the.v collection of dirt, rustor other Yforeign matter `between the connecting portion and the stem. The spring y-may be yreadily assembled onto the body portion, all that isnecessary being to bring theconnectingportion against. the stem and spring the ,arms into/the grooves. 13 before. the sleeve., is screwed onto the' body portion. The springcanbe-just as easily removed.' bIt isfimportantptonoteT that the spring may `be very easil yand quickly replaced inthe event that it has become broken without removing the chuckbodyfrom the Amember which carriesthe same. AIt is only necessaryto unscrew the sleeve D from the chuck `body A] I-Ieretofore, where a ring has been Vemployed to'which the spring arms are connected, it has been necessaryto makezthe stem 11 of the chuck body of Vsuch length as to allow for the .widthor length of the collar and also for sliding movement thereof. In the present instance, since the connectingportion is of relatively smallcrosssection inthe direction ofthe length of the stem, the stem 4may be considerably shortened, and, also, the

sleeve D may be shortenedffeatures of importance asthey permit of a lightening/of the chuck, the production of a more compact arrangement which will make it possibleto get in to closer quarters, and which will result in n My l I improved meansl forpreventing the roller ballsfrom coming` out'k of the loading- Vhole and being-lost will now bedescribed.

The sleeve hasan internal racewayr or groove 30, and the nose piece C has acorresponding racewayBl registering therewith, and in these i the plug in place.

raceways the ball bearings 32 work. About the sleeve D is a shallow groove 33 which is preferably square4 in cross section, and leading from the bottom of this groove to the raceway 30 is a loading opening 84 which is adapted to be closed after the balls are inserted into the raceways by a plug member which is shown most clearly in Figs. 8 and 9. This plug member, which is preferably formed of a small thin strip of sheet metal, has, at its central portion, a pressed out or drawn up boss 35 to either side of which is a wing 36. The plug is preferably formed of resilient metal and is of such diameter that it may be wedged into the loading hole. The stud portion is of such height as to just clear the balls as they pass around the raceways. A split ring 40 is adapted to fit in the groove 33 for the purpose of holding the plug member in place. The ring is preferably made out of square or rectangular steel stock, a suitable length of stock being cut olf and then bent into circular form. The split steel ring 40 is preferably no thicker than the depth of the groove 33 so that, when the ring is in place, it will not project beyond the periphery of the sleeve, and thus the sleeve and ring will present an unbroken surface.

The manner in which the balls are held in place will be readily understood. After the balls are inserted in the raceways, the plug piece is brought into the groove, and the boss 35 is forced into the loading opening. Then the split ring is slipped over the sleeve and brought into registry with the groove 33, whereupon the spring will contract snugly into this groove. The ring will securely hold Y Thus, there is provided safe and reliable means for simply and eectively closing theloading hole. This arrangement results in a more simple and better chuck at a lower cost. If desired, the external periphery of the ring 4:0 may be colored to contrast with the color of the sleeve in order to add a pleasing decoration to the chuck sleeve.

As many changes could be'made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Itis also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the` scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

1. n a chuck of the character described, means for urging the jaws apart comprising Vapair of resilient arms and aparti-circular portion connecting the ends of said arms, said arms being substantially normal to the plane of saidparti-circular.portion and said connecting portion being adapted to receive and slide on a chuck body extending longitudinally between, the arms. Y

2. In a chuck of the character described, means forurging the jaws apart comprising a pair of resilient arms provided at their free ends with means for connecting the same to the jaws and a semi-circular connecting'portion between the other ends of said arms, saidv arms being substantially normal to the plane of said connecting portion and said connecting portion being adapted to receive and slide on a chuck body extending longitudinally between the arms.

3. ln a chuck of the character described, a single integral length of resilient wire having a semi-circular connecting portion and an arm extending from each end of said connectingportion, said arms being substantially normal to said connecting portions and said connecting portion being adapted to receive and slide on a chuck body extending longitudinally between the arms.

4. ln a chuck of thecharacter described,

a chuck body having a threaded portion, jaws V on the forward end of said body, a shell threaded on said body, and means for urging said jaws apart and having a semi-circular connecting portion extending partially around and slidable longitudinally of said body and forwardly extending arms associated with said jaws.

5. Tn a chuck of the character described, a` body portion provided with recesses at its forward end for accommodating the chuck jaws, a reduced portion at its rear end, and grooves leading from the reduced portion to said recesses; and means for urging the jaws apart comprising a semi-circular connecting portion engaging the external periphery of said reduced portion and arms extending therefrom and engaging in said grooves,said semi-circular connecting portion extending partially around said reduced portion and being slidable longitudinally thereof.

6. ln a chuck of the character described, a chuck body provided with recesses at its forward end, a reduced portion at its rear end, and grooves leading fromthe reducedv duced portionv and arms projecting from,

the ends of said connecting portion and extending through said grooves and connected to said jaws, said arms being Vsubstantially normal to said semi-circular connecting4 portion.

7. In combination, a sleeve provided With an internal racevvay, an external groove, and a loading opening leading from the groove 4 to the raceway; a plug memberhaving a boss portion lit-ting in said opening and Wings l engaging in said groove, and a contractile ring in said groove for holding said plug in place.

' 8. In combination, a sleeve provided With in internal raceway, an external groove, and a loading opening leading from the groove to the raceway; a plug member having a resilient boss portion wedgedly fitting in said opening and Wings fitting in said groove, and

a split resilient ring fitting in said groove and over said plug member. Y e

AUSTIN L. STOWELL.

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