US2105788A - Stud setter - Google Patents

Description

Jan. 18, 1938. C, H555 2,105,788

STUD SETTER Filed April l5 1934 III/AM Patented Jan. 18, i936 new Arsjnros 4 claimsl (01,.81-7-53) 'Y This invention relates to automatic chucks; tively ofFig. 2 andlooking the direction of' and the like, andA is particularly concerned 4 with tools for driving and releasing threaded studs,

y screws and other elements of virtually rany naby the driving portions and resiliently connected to those portions in such fashion as to be limitedly movable independently thereof to clutch and release the object being driven by engagement of certain parts withthe object being driven, as well as by the resilient connecting means and by engagement with other parts with the work itself.

rA further object is thev provision of means whereby the resilient connection` may be'quickly and easily adjusted in tension.

Still another object is the'incorp'oration in such devices of improved adjusting means enabling accommodation of studs and the like of variant dimensions.

Other objects and advantages will be apparent from the following description wherein vreference ,is made to the accompanying drawing illustrating preferred embodiments of `my Vinvention, and wherein similar reference numerals designate similar parts throughout the several views. f

In the drawing:

Figs.- 1 and 2 are substantially diametrical longitudinal sections of a stud driver incorporating the principles of this inventicn,.respectively showing the parts in the initial position they occupy before the stud is gripped, and in their operative position While the stud is being held and driven but shortly before the completion of that operation. Y

Fig. 3 is a cross section taken substantially on line 3-3 of Fig; 1 and looking inthe direction of the arrows.

Figs. 4 and 5 are cross sectional views taken substantially on the lines 4-fi and 5 5 respecthe arrows.`

rig. 6 is avivv similari@ Fig,- 2 or a some:

what modified formof the invention; and

Fig. 7 is acrosssection v,taken substantiallyy on the line l-l of Fig.. 6 .and looking in the direction of the arrows.Y

Y Referring now to the drawingzgReference character l0 designates adrivingvshanlz, rigidly connectedgto a casing which: is shown formed of initially separate sections lI-l-Zftightly secured together,-as *byL being threaded'ly interfittedv (at I4). The casing, also seryesas a driving element. The shank is also shown as a separate element threadedly.v secured toik casing section i2, :as at fifi,

and it-fwiu beiapprgiad tilat'loyl Substituting Shanks of;- different formswthedriver may .A bey adaptedtot holding portions of any of various rotating toolsv ofthe electric, pneumatic or other desired sort. f r Y f v.

A- torque ,transmitting vand chuck operating cam l5 of substantially annular form havingl an active innerface Vofuniforinftaper axially of the cam; Whichfisgreatest in width'towardthe rfront of theytool, (left. asf viewed in the drawingyis vkeyed ftothe. casing member1|2 to rotate therewith. The keywaylgll locks thecanragainst turningfwithinthe casing memberfl2, andr its positionisdetermined by the male portion of casingfsection-I I., which y.forces the front end of the-cam against anshoulder in casing :section l2 and the interposed shimslf. The longitudinal positioning 0f the caml may of course beadjusted by removal, addition or lsubstitution of shims. The contour ofthe cam-i as indicated in Figures 1 toll, issuch as to maintain line ,contact with the -frustofconical surfaces .of clutchy rolls .Zi,V which are tapered to conform to the taper of cam l5, While-'dinos drawn longitudinally along the closest surface portionsy are parallel, to provide maximum.- contact with the shank of the stud (3(3).` -Viewed fromvits-end the cam includes an enlarged portion, as I9, for each roll, large enough to .permit theroll to clear thestud but tapering inwardly circumferentially in a direction opposite to that'of normal rotation of the tool untilat their closer ends these tapered portions 'force the rolls closer together than the left end of the driving casingas viewed in Figs. 5

4sus

1 and 2, and also. acts in torsion to tend to turn said element 25 with respect to the driving casing toward such position with respect thereto that. the rolls lie in the larger areas |5A of the cam ring. When the parts are so positioned and element 25 is at the forward end of the casing,

the rolls are free of the stud or other element to bev driven, as indicated above, and the spring is arranged to yieldably urge these parts toward such position. One end of the spring is turned, as at 24, to project into a shoulder formed upon the driven member byV reduction of its end to accommodate the spring, while the other end of the spring is similarly turned, as at 26, but projects iirst radially through a slot 28 in the side .of the casing and then longitudinally` in suchmanner that it may lie in any of a plurality of slots, asV

3|, circumerentially spacedabout and near the shank end of the casing. It will be seen that ially boring the same, as at 375, and intoand from such socket the rolls 20 are radially movable. The effective depth of the socket is adjustable by means of a stop screw'33 which closes the rear end thereof and is held in position by means of jam nut 34. Y y Carried by the frontend of the `casingassembly is an interchangeable nipple 31 4upon which is screwed a cap r38. Onefor mor'elshims, asr-39`, may be arranged `between thecap and ther end of the nipple and to enable'adjustingY the extent to which the cap projects, while larger adjustments may be'made by substituting nipples ofv different lengths. i

Concerning the'operation lof thev device, it will be seen that in Figs. 1 and 2 the work into which the stud 30 is to be driven is indicated at 40 in dotted lines. In using the exemplary stud driv ing device the studsare first positioned in the Work by hand, asby turning them into the Vsame to a depth of'one or two threads. This is usually done by one workman while another operates the driver, which is ordinarily constantly rotated'by the tool in which it is mounted; After slipping the driver over a stud, he bears down against it to force the end of the'stud against the stop screw 38 and move element 25 inward. YDuring 'the initial part of the insertion the stud fits freely into the space between'the rolls, which are' in the larger areas 15A of the cam ring as well as at the larger end of itsA longitudinal taper, in which position they are yieldably held by the spring 22. Continued forcing of the stud into the driver moves the entire driven element 25` to the rear, or right as viewed inthe drawing, with respect to the casing, thereby forcingv the rolls into engagement with the outside of the stud under the iniiuence of the cam. As soon as the rolls are forced against the stud, the resistance of the latter tends to cause thevrolls torollV upon its surface, andV such rolling of the roll members turnsthe e1ement'25, against the torsionalresistance of spring 22, While the rolls are moved toward the smaller portions of the cam. along the gradually circumferentially tapered surfaces and so tightly clamped" against the outsideofthe stud to enable positive driving thereof. (Note Figs. 2 and 4.) A

The length of nipple 31 and position of cap 38 are so proportioned to the depth to which the stud is to be driven that the cap strikes the work as the driving is completed, the casing being thereby forced back (to the right) with respect to element 25, and the pressure of cam I5 upon the rolls so relieved. The torque exerted by the spring then becomes effective to turn the element 25 and so the rolls with respect to the casing to reestablish these parts in the relation shown in Figs. 1 and 3.

In the modied construction shown in Figs. 6 and 'l analogous portions to those previously described'are identiiied by similar reference nu merals with theaddition of the distinguishing character a to each. The tool shown in these views willbe seen to'be of a design especially adapted for lighter work, and proportioned to handle relatively long andthin elements-although this lisY a matter serving merely to illustrate the adaptability ofthe tool to variant work. Ball clutching elements may be used in placek of the rolls 20, as indicated at 20a. They may be varranged and function similarly to rolls 20 previously described, being shown caged `in a driven element 25a slidable androtatable in a casing assembly Ha-I'Za which also serves as a driving element in like fashion. The cam lila, also, may in' general be similar to cam` I5, and

wardly to enable it tol rit in any one cf a plurality of slots 3m formed in this instance in and longitudinally of the threaded inner surface of casing` section Ila at the socket portion into which the driving shank 10a. is screwed. It will, be appreciated that the end of the spring is thus locked in place by means of the shank, which must be removed before the tension of the spring may be regulated by moving its end portion 26a to another slot. Accidental disturbance of the spring adjustment is in this fashion positively prevented. Casing section lZa is shown kas provided with an elongated integral nipple portion 31a carrying at its end an adjustable abutment cap 38a, the positioning of which is dependent upon the thickness ofthe shim, 39a therebeneath. Major adjustmentsmay of course be made by substituting caps of diiierent dimensions.

It will be seen thatl no exposed movable parts whatever other than the smoothly rotatable outer casing are employed, and that within the casing, in addition to the rolls, the cage, cam and spring are the only operative elements, despite which great iiexibility and adaptability are incorporated.

While it will be apparent that the illustrated embodiments of vmy invention herein disclosed are well calculated to adequately fulll the objects and advantages primarily stated, it is;to be understood that the invention is susceptible to variation, modification and change within the spirit and scope of the subjoined claims.

What I claim is:

1. In a device of the character described, a

combined casing and driving element having-a 75 substantially cylindrical chamber therein, a driven element within said casing element and limitedly movable both rotatively and longitudinally in said chamber, means yieldably urging one of said elements toward a predetermined longitudinal and angular position with respect to another, said driven element having a workreceiving socket therein accessible from outside through an aligned opening in the casing, clutching means also within the casing and movable into and out of the socket in the driven element, means including a cam carried by said casing and having surfaces inclined -circumferentially and outwardly aring for moving said clutching means into the socket upon movement of the driven element relatively to the casing under the inuence of work forced into'the socket, said yieldable means comprising a spring acting both torsionally and longitudinally, and secured at one end to the driving element and at the other end to the driven element, and anchoring meansVfo-r the end of said spring which is secured to the driving element including means for holding said end of the spring in any of various spaced circumferential positions, whereby the torsional effect of said spring may be varied.

2. In a device of the character described, a combined casing and driving element having a substantially cylindrical chamber therein, a driven element within said casing and limitedly movable both rotatably and longitudinally in said chamber, means yieldably urging one of said elements toward a predetermined longitudinal and angular position with respect to another, said driven element having a work-receiving socket therein accessible from the outside through an aligned opening in the casing, clutching means also within the casing and movable into and out of the socket in the driven element, means in-V cluding a cam carried by said casing and having surfaces inclined circumferentially and outwardly flaring for moving said clutching means into the socket upon movement of the driven element relatively to the casing under the influence of Work forced into the socket, said yieldable means comprising a spring action both torsionally andflongitudinally, and adjusting means whereby a portion of said spring may be moved, from outside the casing, to any of a plurality of positions.

3. In a device of the character described, a combined casing and driving element having a substantially cylindrical chamber therein,l a

driven element within said casing, and limitedly movable both rotatably and longitudinally in said chamber, means yieldably urging one of said elements toward a predetermined longitudinal and angular position with respect to another, said driven element having a work-receiving socket therein accessible from the outside through an aligned opening in thecasing, clutching means also within the casing and movable into and out of the socket in the driven element, means including a cam carried by said casing and having surfaces inclined circumferentially and outwardly flaring for'moving said clutching means into the socket upon movement of the driven element relatively to the casing under the inuence of work forced into the socket, said yieldable means comprising a spring acting both torsionally and longitudinally, and anchoring means including spaced keeper portions for holding an end of the spring against undesired movement, said end of the spring extending through and being accessible and movable from outside the casing. Y

4. In a device of the characterdescribed, a combined casing and driving element having a substantially cylindrical chamber therein, :a

driven element within said casing and llmitedlyf movable both rotatably and longitudinally in said chamber, means yieldably urging one of said elements toward a predetermined longitudinal and angular position' with respect to another, said driven element having a work-receiving socket therein accessible from the outside through an aligned opening in the casing, clutching means also within the casing and movable into and out of the socket in the driven element, means including a cam carried by said casing and having surfaces inclined circumferentially and outwardly iiaring for moving said clutching means into the

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