USRE23660E - Fastening device - Google Patents

Description

May I26, 1953 fs. .l. ANDREWS 'FASTENING DEVICE 2 Sheets-Sheet 1 original Filed Jan. 16. 1548 Gtmmeg` l|||lll|||lLlll May 26, 1953 $1.1. ANDREWS Re 23,650

I ms'mnmc DEVICE 2 smits-sheet 2 original Find Jan. 1s, 194e i Snventor Reuma 'Mq 2s, 105s FASTENING DEVICE Steve J. Andrews, Cleveland, Ohio, assifnor to Tinnerman Products. Inc., Cleveland, Ohio, a

corporation of Ohio Original No. 2,539,172, dated January 23, 1951, Serial No. 2,679, January 16, 1948. Application for reissue January 30, 1953. Serial No. 334,388

Matter enclosed in heavy brackets l: appears in the original patent but forms no part of this rellne specleation; matter printed in italics indicates the additions made by reissue.

6 Claims.

This invention relates in general to improvements in fasteners for instrument mountings and the method of making such fasteners.

More particularly, the invention deals with an improved clip fastener and the method of making the same in a simplified. highly eflicient construction for mounting various instruments such as fixed condensers, tuning elements. or like control units of radio apparatus, etc.. which embody a. tubular casing, post or similar member as in a coil form, for example, that is mounted firmly and rigidly in generally normal relation to a supporting panel in an installation.

In instrument mountings of this character, the improved clip fastener of the invention is designed to mount various instruments such as tubular coil forms. and the like. having an ad- Justing screw arrangement providing for axial adjustment of the tuning core within they coil form and, in this regard, the adjusting screw is supported in adjustable threaded engagement with a nut portion in the base of the fastener together with friction tongue elements, or the like,

having a friction or binding action on the crests of the convolutions oi' the screw thread to hold the screw in any selected position of adjustment.

In the provision of sheet metal nuts for clamping articles together. lt has been found advantageous to so design the thread-engaging elements that they will cut and bite into the root of 'the screw as the nut is tightened to lock the screw in tightened position. The screw thread at the point of contact in such case is usually more or less marred and mutilated. The action contemplated in the present invention, however, is entirely different inasmuch as the screw is in.. tended to travel frequently back and forth upon the nut for adjusting purposes to meet varying conditions. It is always desirable and sometimes absolutely necessary in tuning applications that adjustments of the parts, or travel of the screw relatively to the nut be smooth, precise and accurate and therefore. the screw thread itself must remain smooth and unmarred. The nut arrangement of the present invention meets this requirement admirably inasmuch as it relies mainly upon frictional engagement for its holding power. In this regard, the diameter'of the helix defined by the nut portion of the fastener is preferably slightly larger than the root of the screw, and this nut portion, therefore, rides upon the smooth undersurface of the thread without cutting or biting into the thread. Likewise, the cooperating friction tongues are so designed and formed as to engage only the crests of the screw threads without scratching ormarring the threads.

Heretofore, in the manufacture of fasteners having such friction tongues, the stamping and severing of the tongues has resulted in a sharp burr or tang which is highly objectionable and undesirable in that it shaves, scratches and mutilates the crests of the screw threads in use. To avoid such burrs or tangs is diiiicult due to the fact that the friction tongues are relatively small and the formation thereof difficult to coniol as they are severed in high speed produc- A primary object of the invention, therefore, is Ato provide a clip fastener of the kind described and a method of making such a clip fastener in an improved design in which the thread opening and the friction tongues are formed without burrs, tangs or sharp edges of any kind in contact with the screw threads so as to eliminate any possibility of scratching. mutilating or otherwise marring the screw threads.

Another object is to provide such a clip fastener having an improved, highly simplified mounting arrangement comprising snap fastening elements for attaching the same in a panel opening in operative position, and further, with anchoring elements formed complementarily to said snap fastening elements for retaining a coil form or other instrument to be mounted.

A further object of the invention is to provide a fastener having the foregoing structural characteristics and an improved method of making the same from a simple bla obtained from standard sheet metal strip s k with little loss or waste of material.

An additional object of the invention is to Drovide a spring clip fastener such as described for mounting a tubular member on a plate-like object, which clip is inexpensive to produce, simple to install, adaptable to tubular members and supporting plates within a relatively wide range of tolerances, and when installed. is strong, durable and reliable and not subject to loosening, wobbling or displacement.

Further objects and advantages and other new and useful features in the construction, arrangement and general combination of parts of the invention will be readily apparent as the following description proceeds with reference to the accompanying drawings, for purposes' of illustration but not of limitation, in which like reference characters designate like parts throughout, and inwhich:

Fig. 1 is a front elevational view, partly in section, of a completed instrument mounting in accordance with the invention, in which the clip fastener is shown in edge elevation and the assocacao 3 ciated support and instrument body shown partly in section to illustrate the purpose and function of the various elements of the clip;

Fig. 2 isla side elevational view of the completed instrument mounting shown partly in section. as along line 2-2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 is a perspective view of the clip fastener per se;

Fig. 4 is a horizontal sectional view of Fig. l as along line I-l, looking in the direction of the arrows;

Fig. 5 is a sideview of Fig. 1 showing the clip in side'elevation and the supporting panel in section; and.

Fig. 6 is a bottom plan view of the fastener per se showing the core adjusting screw in threaded engagement with the nut portion on the fastener base and in frictional engagement with the friction tongues carried by the fastener base;

Figs. '7 to 20 inclusive illustrate the several steps in the improved method of making the clip fastener of the invention, Figs. 7 and 8 being fragmentary edge elevational and top plan views, respectively, showing the initial step in the method for forming the base of the clip with a protuberance in the centralportion of a fastener blank;

Figs. 9 and l0 are similar fragmentary edge elevational and top plan views, respectively, showing the next step by which an intermediate strip in the protuberance is severed and ,stamped outwardly out of the plane of the protuberance to denne the portion from winch the friction tongues are to be formed;

Figs. 11 and 12 are similar fragmentary edge elevational and plan views, respectively, illustrating the following step whereby the aforesaid intermediate strip is severed transversely to define the lengths of the friction tongues;

Figs. 13 and i4 are similar fragmentary edge elevational and plan views. respectively, illustrating the next step in the operation for peening the extremity of the friction tongue having an inwardly extending burr so as to remove such burr;

Figs. 15 and 16 are similar fragmentary edge elevational and plan views, respectively, showing the subsequent step for bending the end portions of the friction tongues outwardly in generally normal relation to the base of the clip;

Figs. 17 and 18 are similar fragmentary edge elevational and plan views, respectively, showing the following step for bending the free end portions of the friction tongues transversely in generallyA arcuate formation to conform generally to the contour of the screw to be employed;

Figs. 19 and 20 are sectional and top plan views, respectively, of the whole fastener blank showing the step in the method for providing the ar'ms or body portions cf the fastener with article engaging prongs and complementarily formed cam shoulders adapted for snap fastening engagement in a socket opening in the panel support;

Fig. 21 is an edge elevational view of the completed clip fastener; and

Fig. 22 is a side elevational view of the completed clip fastener.

Although the invention deals, more or less, with the provision of an instrument mounting 4embodying a simple, reliable and inexpensive fastening means for securing an electrical unit, such as a tuning coil or fixed condenser to a supporting panel of a radio set, for example. it is to be understood. however, that the invention is one of 4 general utility and is not limited =to a unit of Athe class illustrated and described inasmuch es fixed condenser, or the like. which is mounted onto a supporting panel P, such as the base panel of a radio chassis. for example. The tuning unit comprises a generally tubular shaped member l such as a tube, sleeve, post, cylinder, or the like, which is constructed of any suitable material such as cardboard, composition material, plastic, etc., to serve as a coil form or equivalent body for any related type of instrument to be mounted on the supporting panel P. The coil tube 5 is intended to be fixedly and rigidly mounted in a socket opening lV in the supporting panel P and such socket opening, accordingly, is of a size approximating the combined diameter of the tube 5 in assembled relation with the clip as illustrated in Figs. l and 4. for example.

In the present example, the tuning unit is shown as including an inner core element l which is axially movable within the hollow body of coil tube 5 by an adjusting screw 1 which extends through the panel opening and is movably supported in the assembly by thread engaging means on the fastener base. The adjusting screw 1 is thereby capable of rotation for any desired, fine or minute adjustment of said screw. as by a tool applied to the tool recess a provided in the free end of the screw. for example.

The fastener. designated generally III, is a relatively simple and inexpensive article of manufacture in that it may be most economically con-v structed from a comparatively small section of any suitable sheet metal, preferably of a spring metal nature. such as spring steel or cold rolled steel having spring-like characteristics. The fastener may be formed from sheet metal blanks of various outlines, but from the standpoint .of most economical production is best provided from a generally rectangular blank obtained from standard sheet metal strip stock with little loss or waste of material. As shown in Fig. 3, a blank or stamping of such character is bent into the form of a generally U-shaped fastener comprising a base II intermediate a pair of cooperating arms or body portions I3 which are bent into a generally arcuate configuration corresponding to the cylindrical circumference of the coil tube I or other cylindrical body in order to engage the same firmly' and rigidly on opposite faces thereof.

`T'he free ends of said arms I3 are bent outwardly in opposite directions in the manner of anges I5. Preferably such flanges are bent downwardly slightly below the horizontal in normal untensioned relation in order to bev yleldable in the manner of yleldable head portions so that the fastener is adapted for securing engagement with supports of various thicknesses, within limits. and to compensate for irregularities and manufacturing variations in the thickness of the support adjacent the socket opening I therein. As illustrated in Fig. 3, perforations IB preferably are provided at the junction of flanges I5 with the adjacent arcuate arm portions I3 in order to facilitate bending in the manner shown.

Along the edges of the arms or body portions sasso Il of the fastener, diagonal slits are provided in a predeterminedspacing from the anges I approximating thethickness of the panel on which the fastener is to be mounted. These diagonal slits each define inclined cam shoulders IB and cfompiementarily shaped prongs II 9 both formed at the same time in an inexpensive and highly practical manner. The prongs I9 are bent inwardly in amannerto define inwardly extending barbs adapted to dig into and become embedded in the coil tube 5 when said tube is assembled within the arcuate arms Il of the tubular clip. The edge portions adjoining the cam shoulders I8 are preferably bent slightly outwardly in the manner'of wings to position said inclined camshoulders IB in an effective position for snap fastening engagement with the adjacent lower corner edges of the socket opening l in the supporting panel P. l

In this relation, the adjustable core 8 which is telescopically received within the coil tube l is adapted to be supported in the assembly by means of. the adjusting screw 1 threadedly engaged with thread engaging means provided in the base Il of the fastener. Such thread engaging means are designed to supply a tensioned, frictional threaded engagement with said adjusting screw 1 to prevent displacement or loosening thereof from any desired setting or adjusted relation yof the tuning core I within the coil body I in operative position. In a preferred form of such thread engaging means. a substantially diametric strip portion of the base I I of the fastener is slit andstamped therefrom to provide a pair of opposing yieldable tongue elements 20 which are bent outwardly out of the plane of said base Il for engaging the crests of assembled relation cf the adjusting screw 1 with such thread engaging means, the thread engaging nut elements 22 are received in the helical -thread groove of the screw and cooperate with the friction tonguetssn frictionally and grippingly engaging the cres' of adjacent convolutions of such thread at all times. There is thus provided an exceptional thread locking action onthe ad' justing screw 1 as a-result of the combined drag exerted on the screw thread by the thread engaging nut portions 22 together with the pronounced, frictional gripping action of the tensioned friction tongues 20 with the crests of the thread convolutions adjacent said thread engaging portions. Said friction tongues 2l otherwise serve to lbolster and maintain the adjusting screw 1 in substantially perpendicular relation to the base Il of the fastener in the. threaded relation Athereof with the thread engaging elements 22.

In this way the cooperative threading action of said thread engaging elements 22 with the adjusting screw is reinforced by said friction tongues 2l and made positive and secure such that any possible looseness or play even after an extended period of use is minimized and practically eliminated. lAccordingly, the arrangement is such that the adjusting screw 1 is held by a frictional thread locking action in any adjusted position against accidental turning or unintended rotation which otherwise would disturb the proper setting of the bolt or screw 1. Howeven, even though the adjusting screw 1 is thus retained under the various friction forces s et the threads of the adjusting screw 1 under tension. Said tongue elements are bent transversely in an arcuate form to denne cooperating curved surfaces adapted to engage relatively wide portions of the crests of the screw threads on the screw 1, as shown in Figs. 4 and 6, to effect a substantial frictional drag thereon. In the space from which said friction tongues are provided,

there is presented a screw passage with the marginal edges of the side portions 22 bordering such screw passage formed on a helix so as to define thread engaging nut elements adaptedfor uniform threaded engagement with the threads of the adjusting screw 1 substantially in the manner of a nut.

As shown in Figs. 4 a'nd 6. the edges of such thread engaging nut elements 22 bordering the screw passage, are preferably slightly larger than the root of the adjusting screw 1 and are concentric therewith to engage smoothly in the helical groove defined by the thread of said screw. Also, as illustrated in Figs. 1, 2, and 5, 4said nut elements 22 are bent or formed in a manner to provide a thread engaging edge lying on a helix corresponding substantially to the helix of the screw thread for even and uniform threaded en gagement therewith. Such threaded engagement is usually about thumb tight for best resuits and. as best seen in Figs. 4 and 6, the corners of said thread elements 22, adjacent the effective thread engaging portions thereof, are preferably rounded off in order to minimize cutting, scratching, shaving or other inordinate wear on the screw threads which might take place under extensive adjusting movements and possibly result in looseness or play in the thread engaging action.

Accordingly, it will be understood that -in the up on ,the thread thereof, said screw is capable of ilne, minute adjustments by means of a tool applied to the recess I to turn the vsame as required in providing any necessary or desired relation of the core 8 within thebody of the coil tube l.

In use, it will be understood that with the various parts of the instrument mounting provided substantially as described, the clip I0 and the adjustable core 8 are assembled by threading the adjusting screw 1 into threaded engagement with the nut elements 22 in the 4base Il of the fastener and into frictional contact with the friction tongues 2li. 'Ihe coil tube or coil form li is then telescoped over the tuning core l and the lower end thereof forced between the arcuately shaped arms or body portions i3 of the clip in a friction, press fit in which the leading edge of the tube seats rigidly on the fastener base I I and the prongs Il dig into and become embedded in adjacent surfaces of said tube 5 to anchor the same in such assembled position with the clip fastener. The prongs I l are formed to extend inwardly and downwardly so as to permit move' 'ment of the tube to the aforesaid assembled position in one direction but prevent movement in the opposite direction toward disassociation from the clip.

Although the core l may be assembled in a similar manner after the coil tube 5 is mounted onto the supporting panel, the foregoing procedure is preferable in that all the parts of the instrument are assembled and read-y for the nal step in mounting the unit on the panel in a simple and speedy procedure, which, of course, is most important in mass production methods in `that the complete units may be prepared in quantities ready for quicl and easy installation in a' minimum of time and effort as is necessary on an assembly line, for example.

With the instrument unit thus assembled, the same is easily and quickly mounted on the supsasso 7 porting panel P by inserting the base II and the adjacent lower securing portions of the arms Il of the fastener through the socket opening I in a manner whereby the leading edges of the outwardly bent wings carrying the inclined cam shoulders Il serve as substantial guide surfaces which cam the side walls of such socket opening with progressively increasing force. This causes a gradual compression of said wings inwardly as necessary to permit passage thereof through said socket opening I to a position in which the inclined cam shoulders I l on said wings snap into engagement with the lower corner edges of said socket opening and the adjacent marginal portions at the underi'ace of the panel P, substantially as shown in Figs. 1 and 4. In this position. the flanges I5 bear upon the opposite face of the panel P to cooperate with said cam shoulders Il in engaging opposite sides of said panel to retain the instrument in nrm. rigid. iixedly mounted position thereon.

Ii' desired, a substantially positive locked mounting may be provided by forming the shoulders I8 in a more pronounced configuration or tapered substantial cam surfaces. as shown. is

more advantageous in certain respects in that the use of a certain size fastener with supporting panels of several thicknesses is possible. Also, a positive, self-seating of the fastener in rigid mounted position is ensured by reason of the expansive action supplied by the inherent resiliency of the wings adjoining the cam shoulders Il to urge the said cam shoulders outwardly in a manner to cause the same to ride automatically on the lower corner edges of the socket opening to the point of most effective locked fastening engagement therewith substantially as shown in Figs. l and 4. It is also to be appreciated that the spring flanges I5 preferably are bent slightly downwardly in normal untensioned relation and are thereby effective to cause said cam shoulders Il to compensate for slight clearances and other manufacturing variations in the size of the socket opening and the thickness of the panel member. Likewise, any looseness or play in the connection after a period of use is immediately taken up such that an installation embodying the improved instrument mounting of the invention is rigid and positive throughout its entire length of service.

In the event that removal of the mounting is desired. this may be accomplished simply by exertingsuitable force on the arms or body portions II to urge the same inwardly in a manner whereby the shoulders Il thereon may clear the socket opening I as the unit is pushed in an axial direction opposite to that in which the same was applied to mounted position. whereupon the several parts of the instrument may be disassociated in a reversal of the procedure described for assembling the unit.

Figs. 7 to 20 inclusive disclose the various steps in the method of making the aforesaid clip fastener with the completed article of manufacture being shown in Figs. 21 and 22. Figs. 'I and 8 represent the -central portion 4l of the fastener blank defining the base portion II between. the arms or body portions Il, and this central portion is stamped into an outwardly pro- 8 jecting protuberancs 4I in the initial step of manufacture.

As shown in Figs. 9 and 10, the protuberanoe 40 is then slit to define a diametric strip portion I2 having an intermediate circular area 43 ap proximating the required size of the screw pas- Sse to be formed in the fastener base. In the succeeding step shown in Figs. 11 and 12. the intermediate strip I2 is severed transversely across the center of the circular area Il to define the elements 45. 48, from which the friction tongues in the completed fastener are formed. In this severing operation, there necessarily resultsl at the point of shear, slight bu'rrs 41. 4l, on the extremities of the elements 45, 46, respectively. The burr I'I which faces the screw thread in the complete formation of the friction tongues is highly objectionable in that it would shave and easily wear away the screw thread and thereby causethe same to grow loose and unserviceable. Moreover the small hair-like shavings of metal which result are very undesirable in that they fall into the delicate electrical parts of the radio and cause defects and faulty operation thereof.

Accordingly. as shown in Figs. 13 and 14. the objectionable burr 41 is removed by a flattening or peening operation which leaves the inner surface of the tongue element ll smooth and flat. The burr Il on the other tonque element 46 extends away from the screw thread in the completed formation thereof and accordingly, need not be removed.

Figs. 15 and 18 disclose the following step in which the end portions of the tongue elements 45, il. are bent outwardly to generally parallel spaced relation and. as illustrated in Figs. i7 and 18, such end portions otherwise bent transversely in arcuate form to define the final design oi the friction tongues 20 in the completed fastener as shown in Figs. 1-6. inclusive, and Figs. 2l and 22.

During the foregoing operations. the marginal portions of the circular screw passage in the fastener base are suitably worked to provide such marginal portions in the form of a helix defining the nut portions 22 for threadedly engaging the adjustable core screw 1, as described with reference to Figs. 1-8, inclusive.

With the central portion 40 oi' the fastener tral portion l0 defining the fastener base II and the arms I3 together with the end flange portions Il on either side thereof. 'I'he arms vI3 are provided with the perforatlons' I8 and the diagonal slits on the longitudinal edges thereof, Fig. 20. defining the inclined cam shoulders I! and the adjacent complementarily formed prongs Il. The edge portions adjoining the cam shoulders I I are bent outwardly slightly in the form of wings, as described. and the prongs i9 bent inwardly for engaging and anchoring the coil tube which is assembled between the arms I3 of the completed fastener. while the arms Il themselves are cupped transversely in arcuate form to provide the generally tubular formation. of the clip body.

The fastener Il is completed by bending the said arms Il relatively to the base II in the same general direction to define the generally tubular design of the clip and the end flanges Il also formed by further outward bends along the transverse dotted lines. Fig. 20,-to extend outwardly in opposite directions in the completed form of clip fastener shown in Figs. 3. 21. and 22. Preferably the perfor-ations Il are provided in sacco the arms Il to lfacilitate bending oi the substantlally ilst end flanges Il relatively to the transversely curved surfaces of said arms I3. f

In any form, the fastener is preferably construct-ed of relatively thin sheet metal, the thickwould affect the precise and exact llt. of the re- K spective paris of the instrument mounting.

While the invention has been described in detail with specific examples, such examples are intended as illustrations only, since it will be apparent that other modifications in the construction. arrangement and general combination of parts may be devised without departing from the spirit and scope of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, with all changes falling within the scope, meaning and range of equivalency of the claims intended. to be embraced therein.

What is claimed is:

1. A clip fastener for attaching an instrument in an opening in a plate comprising a sheet metal body defining a base and spaced. attaching arms extending from said base in generally tubular formation, the edges of said arms having inclined slits providing inwardly bent prongs and complementarily shaped shoulders for engaging said plateadiacent said opening, a pair ot tongues severed from said fastener base and providing in said base circular thread elements bent to lie on a helix for uniform threaded engagement with a threaded member, `said tongues having their end portions bent to provide smooth inner surface portions in spaced face to face relation and curved transversely in arcuate form ior engaging substantial curved areas oi the crests of the thread convolutions of the threaded member.

2. A clip fastener for attaching an instrument in an opening in a plate comprising a sheet metal body defining a base and spaced attaching arms extending from said base in generally tubular formation, the edges of said arms having inclined slits providing inwardly bent prongs and complementarily shaped shoulders for engaging said plate adjacent said opening, said shoulders on said arms being'provided on wing portions bent outwardly from said arms and the edges of said wing portions below said shoulders defining guide surfaces leading to said shoulders, a pair of tongues severed from said fastener base andproviding in said base circular thread elements bent to lie on a helio: for uniform threaded engagement with u threaded member, said tongues having their end portions bent to provide smooth inner surface portions in spaced face to face relation and curved transversely in arcuate form for engaging substantial curved areas of the crests of the thread convolutions of the threaded member.

3. A clip fastener for attaching an instrument in an opening in a plate comprising a sheet metal l0 body defining a base and spaced attaching arms extending from said base in generally tubular formation, the edges of said arms having inclined slits providing inwardly bent prongs and complementarily shaped shoulders for engaging said plate adjacent said opening, a pair of tongues severed from said fastener base and providing in vsaid base circular thread elements at opposite sides of' said tongues, said thread elements being bent to lie on a helix for uniform threaded ensagement with a threaded member, said tongues hwving their end portions bent to provide smooth inner surface portions in spaced face to face relation 'andcurved transversely in arcuate form for engaging substantial curved areas of the crests of the thread convolutions of the threaded mem- 4. A clip fastener for attaching an linstrument in an opening in a plate comprising a. sheet metal body defining a base and spaced attaching arms extending from said base in generally tubular-- l formation, the edges of said arms having inclined t slits providing inwardly bent prongsl and ccmplementarily shaped shoulders for engaging said plate adjacent said opening, said shoulders on said arms being provided .on wing portions bent outwardly from said arms and the edges of said wing portionsbelow said shoulders defining guide surfaces leading to said shoulders, a pair of tongues severed from said fastener base and pro- .viding in said base circular thread elements at opposite sides of said' tongues, said thread elements being bent to lie on a helix for uniform threaded engagement with a threaded member, said tongues having their end portions bent to provide smooth inner surface portions in spaced faceta face relation and curved transversely in arcuate form for engaging substantial curved areas of the crests of the thread convolutions of the threaded member.

5. A clip fastener for attaching an instrument in an opening in a plate comprising a sheet metal bodudeflning a base and` spaced attaching arms extending from said base in generally tubular formation and terminating in outwardly extending flanges', the edges of said arms having inface to face relation and curved transversely in l arcuate form for engaging substantial curved areas of the crests of the thread convolutions of the threaded member.v i

6. A clip fastener for attaching an instrument in an opening in a plate comprising a sheet metal body defining a base and spdcedattaching arms extending from said base in generally tubular formation and terminating in outwardly extending flanges for engaging one side of said plate, the edges of said arms having inclined slits providing inwardly bent prongs and complementarily,

shaped shoulders spaced from said flanges for engaging the opposite side of said plate adjacent said opening, said shoulders on said arms being provided onl wing portionsbent outwardly from said arms and defining guide surfaces leading to 11 said shoulders, a pair of tongues severed from said fastener base and providing in said base circular thread elements at opposite sides of said tongues. said thread elements being bent to lie on a helix References Cited in the 111e of this patent or the original patent UNITED STATES PATENTS fof uniform threaded engagement with a tnread- 5 Nlglbe ed member in cooperation with said tongues, said zgglsg tongues having their end portions bent to prog2 071507 vide smooth inner surface portions in spaced lace -24 976 to face relation and curved transversely in arcu- 332441978 ate form for engaging substantial curved areas 10 2135-167 of the crests of the thread convolutions of the 21377-694 threaded member. 2.398,3 STEVE J. ANDREWS. 2.434,8

Name Date Ryder Apr. 6, Cuno et; a1. Apr. 5, Douglas July 9, Tinnerman June 10. Tinnerman June 10, Mitchell May 15, Judd June 5. Hartman Apr. 16,

Flora, Jan. 20,

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