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A. G. HERRESHOFF FASTENING DEVICE Filed July 6, 1942 INV'ENTOR ALEXANDER G. HERRESHOFF . ‘w’ Azpféas BY W M “ _ ‘Patented Aug. 6, 1946 2,405,424 UNITED STATES PATENT’ OFFICE FASTENING DEVICE ‘Alexander G. Herreshoif, Grosse Pointe, Mich... assignor to ‘Chrysler Corporation, Highland Park, Mich., a corporation of Delaware Application. July 6, 1942, Serial No. 449,868 5 Claims. (01.151-29) 2 , _ This invention relates to fastening or secur trated in Fig. 1 by utilizing body A as an abutment in'g devices for connecting together component and cap B as a reaction-taking member. parts of machines, machine elements, or other structures. My invention is especially advan The portion A is provided with bosses l3 each ‘ having an opening l4 therethrough in alignment with an opening [5 extending through a boss iii of cap B. A bolt C extends through openings it and I5 and has an intermediate pilot portion ll tageous for connecting together the bearing por tions of an engine connecting rod, especially for aircraft engines wherein it is desired to stress engaging portions of openings 14 and 15 adjacent the connecting rod bolts a relatively great amount the vface engagement of cap B with rod portion A and to an exacting specification. , ‘A vfurther object is to provide a ‘fastening de 10 as at l8. ~ At its upper end each bolt C has an enlarged vice having a relatively simple and effective look annular head portion leseated at abutment 29 ing means for maintaining the parts in assembled formed on the upper end of boss i3, this bolt relationship against danger of the fastening de vice. releasing , its. connection. . head having integrally ‘therewith an annular lug I Another object is to provide an improved fas tening device which is capable of assembly in lo cations where there is little room for the oper ator.., For example, in the assembly of connecting rods of’ai'rcraft engines my device is adapted for 15 2| upstanding from the upper face of the bolt with other devices requiring the assembly of parts in a direction transversely of the connecting rod. ing portion of the lug 2! thereby, allowing ready installation of bolt C axially downwardly but holding thebolt against rotation in either direc head and arranged to laterally overhang the same at one point or region in the periphery of the bolt head, the lug 2| being of much less diam eter thanthe bolt head. The lug 2| projects into assembly in a direction axially- of the connect 20 the groove 22 of portion A, this groove having an arcuate formation to ?t the side of the overhang ing rod where access is relatively easy in' contrast l. An additional object is to provide a fastening device which is freefrom parts tending to vibrate 2.5 or shake loose when subjected to use such as in conjunction with bearing caps of engine connect ing'rods. . a ' ’ Further objects and advantages reside in the novel combination and arrangement of parts more _ particularly’ hereinafter described and claimedreference being had to the accompany tion. , The lower end portion of opening 15 is formed ,with- a frusto-conical seat 23 for a correspond ingly' formed seat portion of a nut D which is in ternally threaded at 24 to fit the threads 25 on the lower end of bolt C. The upper end portion ' of nut D projects, preferably with clearance; into the lower end of opening l5 and has an annu lar body portion 26 extending downwardly from the ‘seat, portion to the annular planar end face ing rod assembly showing my fastening device ap 35 21. Adjacent this face the body portion 26 has an annular side wall which is formed externally plied'thereto. with an annular series of contiguously disposed . Fig. 2 isan enlarged sectional view of a portion axially extending ?utes or serrations 21’. These of the Fig. 1 connecting rod taken to illustrate ing drawing in which: .. 'Fig. 1 is a front 'elevational view of a, connect serrations are very ?ne in the sense that there are a great many of them arranged closely together 7 .40 '. Fig. 3 is-a top‘ plan view taken as indicated so as to obtain a very sensitive Vernier-like look by line 3—3 ofFig. 2. 1 ing adjustment ‘for tensioning bolt C. s ‘Fig. 4 is a‘bottomplan view taken as indicated Seated onrthe end face 21 is a locking cap E by line 4—4 of Fig. 2. which, for this purpose, is provided with an an 5 is anexploded'perspective view of the .45 nular body portion 28 disposed transversely of the my fastening device.‘ ~ ' - ‘fastening elements. bolt C and having a central opening 29 through which the threaded end of the bolt may be free ly extended. The cap is provided with a tongue ‘my invention as ‘applied to an aircraft engine 30 which, prior to ?nal locking assembly of the connecting rod having a main body portion A andfbearing cap 13., The portion A has the usual 50 whole device, extends in a direction axially of the > bolt and is offset inwardly of the opening 29 p'istonpinbearingportion I!) at one end and a half so asto lie in a groove 3|. This groove extends bearing. portion 1 i at the other end for receiving axially or the bolt 0 for a portion of the threaded the crankshaft throw. A companion half-bearing length thereof and is open at the bottom or I2; isgformed in cap ‘B, it being desired to tightly assemble the cap‘and portion A together as illus 55 threaded end of the bolt so as to readily receive Referring to the drawings I have illustrated 2,405,424 3 4 the tongue 38 when the cap E is assembled. This cap is provided with an axially extending annu position rather than into face engagement with one of the segments 35. This securely holds the nut F and facilitates bending the tongue back to its original position when it is desired to dis assemble the parts. or course, the 45° bending lar ?ange 32 which projects upwardly at right angles from the periphery of the annular body portion 23, the ?ange overlying the lower end p01’ tion of nut D and being internally formed with is not important as any angle of bending is sat flutes or serrations 33 complemental withthe ser isfactory as long as the tongue overlies the edge rations 2?’. Thus serrations 33 are equal in num of one of the segments'35. By appropriately pro ber to serrations 2?’ and similarly directed so portioning the parts, the tongue 30 may be made that the serrations of cap E will. fit the serrations ‘to project slightly beyond slot 3|, when nut F of nut D and provide Very small increments oi‘ ' is assembled, so as to facilitate the bending over locking rotatable adjustment between these parts. Below or outwardly of the cap E, I provide-a 1 second nut F in the form “of a locking member. In the present instance I employ a well-known , commercial type of nut lock known in the trade as Palnut. This nut F comprises an axially per ' of the tongue as indicated by the dotted line showing of the tongue in Fig. 2. However, this is not entirelynecessary as the tongue may be formed soas; to be spaced outwardly from the ‘bottom of groove 3| when assembled, thereby ac eominodating ready access by any suitable tool for bending the tongue into locking position. Tongue forated transverse body of dished formation have ing a plurality of oircumferentially spaced radial ly extending kerfs or slots 34 forming-the dished spring wings or body-segments 35. 'These wings dental backing o?'from its desiredlockingiposh are of progressive thread-like curvature and of tion. It will be "understood thateach ofthe il 38 servesto prevent rotation of cap E relative to the bolt and .to lock 'thenut F against. acci such radial length such that thenut F will ‘re lustratedlocking devicesiis assembled in the gen ceive the boltthread 25. The outer margin ‘of eralmanneras outlined above. , the nut-slotted body is struck downwardly inza 25 My .fastening means may, of course, be em 'direction oppositely to thatlof the ?ange .32 to ployed to assemble parts of structures other than form ‘a non-cylindrical?ange .36. Usually ‘the connecting rodparts. ‘However, my invention is nut F has its ?ange formed by six .?at portions particularly adapted for connecting rod bearing for convenient engagement by a wrench employed cap assemblies, especially for aircraft engines, as all parts of thefas'tening device are assembled in to In turnthenut. assembling1 my I locking device, .. . . ‘the '.parts r, A. and Bare assembled with thefbolts cpositioned as illustrated. Each-boltis held against rotation by reason of the lug and groove look at 21,22‘. Then the nut D is threaded on the‘bciltC ‘and engaged at seat 23.- The serrations?!’ provide means for‘engaging nutD by a suitable wrench. The nut D is then turned until thedesired amount afdirection'axia'lly of'the bolt C. Space limita tions do not conveniently accommodate ‘the as: sembly of parts'in a'direction transverse to the axis of bolt C. Furthermore, there areno parts to shakelooseor to vibrate under the severe. ac tion of the connection rod. 7 _ I . _ All references .to terminology of position, such as is used in'my speci?cation and claims, is em ployed in a relativesense for convenience and understood that-both of the nuts D are tensioned 40 clarity of expression as obviously the fastening de preferably by alternate increments of rotation vice may extend in any direction other "than that so that their action isbalanced during the assem bly of the econnectingrod as a whole. . a > _ By arranging the upper end portion ‘of nut D Then the cap E is inserted over the threaded withqclearancein the opening I75, the stresses of‘ tension stress is imparted" to vbolt C, it'being illustrated. V . r . end ,ofvthe bolt 1C, the body. portion .28 engaging 45 arising fromv seating the nut ‘at the frusto-conical the nut face.” and the tongue 38 sliding viii-the seat 23 tendtoequalize along the length of- the threads of the nut thereby ‘avoiding tenden'cyfto groove 3| until serrations-33interlocklwith serra tions‘?'. In-theevent that theseserrations do unduly stress these threads at the upper 'end‘p'or not engagingly alignthen’thehdt D‘ is given ,a slight rotation. Injno instance will it be neces vtion of the nut. v > .f 5 The speci?c anchoring means shown at'jthe sary to rotate'thenut D more thanhalf the .an upper end of the .bolt is further illustrated and gular distance between ‘a pair ofcontiguous ,ser claimed in the copending application of John‘P. rations. rBy forming the serrations very ?ne, Butter?eld, Serial No. 449,867, ?led July 6, 1942. as illustrated, the desired closelspeci?cation for tensioning bolt C may be preserved within ex 55 1.‘In a locking device for a plurality of mem tremely close limits. Cap E and .nutD are thus bers, a ‘bolt having a threaded portion and an Iclaim: locked together against relative rotation. I y , '_ , . ' . ~ axial slot in thethreaded portion, a nut adapted After cap Bis-positioned in place as aforesaid, to engage‘the threaded portion "of the bolt ‘and the nutv F is ‘assembled by threading the same having axially extending raised portions entirely on the lower end of the bolt C. When ‘the nut]? about the periphery, ‘a cap havingraised portions engages the body’portion 28 ofcap E, then the entirely about an inner surface -.adapted to en nut F ‘cannot move further axially but by fur gage the raised portions of 'the‘nutso .a‘s'to pre ther rotation of nut F'the dished wings 35 will vent relative rotation of the'nut ‘and the .capand be sprung so as to follow the threads .2‘! and ‘in to permit relative axial movement and‘alsohav so doing "the wings will be forced .ltoqlose some of 65 ing a tongue adapted to project .into the axial their dished-formationrand to biteinto the threads slot of the-bolt to prevent relativearotation of 25 thereby securely locking cap'E against axial the cap and the bolt, and .a locking member adapted to be engaged by the tongue of the cap g‘After inut F is positioned in looking relation (as so as to be prevented from rotating with respect aforesaid, the tongue 30 is ‘bent outwardly and 70 to the bolt and having a body portion deformable inwardly so as to engage one of the segments 35 into very, tight engagement with the threaded displacement. - ~ . ofznutF and'in this manner it will beimp'ossible .for nutFto accidentally back off ‘the‘threads 25 or even to loosen its locking grip. ' By ‘preference the tongue '30 is bent about 45° from its Fig. 5 " portion by rotation of the locking member ‘against theicap.v ; ‘ . . . . 2, 'ZInja. fastening device fora ‘plurality of mem here, one of ‘the members having'an abutment, ‘2,405,424 5 6 and another of the members having a seat; a ten sion-taking bolt having a head adjacent one end.” thereof adapted to engage said abutment and having a portion adjacent its other end thread ed, said threaded end portion of said bolt being the serrations of said nut thereby to lock said cap and nut together against relative rotation, formed with a slot extending in a direction ax be adapted for locking relationship with said lock a locking element threaded to engage said bolt threads and to be seated on said cap, said cap having a tongue projecting therefrom so as to ing element, said tongue having a'portion thereof ially of said bolt, a nut threaded to engage said adapted to be disposed in said bolt slot thereby threaded bolt portion and having a portion to prevent rotation of said cap relative to said thereof adapted to engage said seat for tensioning said bolt thereby to fasten said members together, 10 bolt. 4. In a locking device for a plurality of mem said nut having adjacent an end face thereof an bers, a bolt having a threaded portion and an annular side wall portion thereof formed exter axial slot in the threaded portion, a nut adapted nally with a circumferential series of contiguous to engage the threaded portion of the bolt, a ly disposed serrations extending in the direction of the axis of said bolt, a cap having an annular 15 cap having a portion adapted to engage the bolt slot to prevent relative rotation of the cap with body portion adapted to pass over the threaded respect to the bolt, said nut and cap having in end portion of said bolt and adapted, when as terengaging portions preventing relative rotation sembled on said bolt, to seat on the said end face but permitting relative axial movement, and a of said nut, said cap having an axially extending annular ?ange adapted to overlie an end por- 20 locking member adapted to engage the threaded portion of the bolt and to prevent axial move_ tion of said nut and formed internally with a ment of the cap and to be engaged by the said circumferential series of contiguously disposed portion of the cap so as to be prevented from serrations for engagement with the said serra rotating with respect to the bolt. tions of said nut, said cap having a tongue pro jecting from its said body portion adjacent the 25 5. In a locking device for a plurality of mem aperture thereof and adapted, when said cap is ‘ bers, a bolt having a threaded portion and an axial slot in the threaded portion, a nut adapted ' assembled on said bolt as aforesaid, to lie in said' to engage the threaded portion of the bolt and bolt slot and extend from said cap body portion having axially extending raised portions entirely in a direction axially of said bolt toward said other end of said bolt, a lock nut adapted to seat 30 about the periphery, a cap having raised portions entirely about an inner surface adapted to en on the said cap body portion, said lock nut hav gage the raised portions of the nut so as to pre ing a deformable body portion apertured for vent relative rotation of the nut and the cap and threadedly engaging the threads of said bolt and to permit relative axial movement and also hav adapted to be deformed into springing locking engagement with said bolt threads when said 35 ing a tongue adapted to project into the axial slot of the bolt to prevent relative rotation of lock nut is turned on said bolt after being seated the cap and the bolt, and a locking member hav on said cap, said tongue adapted to be bent out ing a dished portion deformable into very tight wardly from said bolt slot so as to overlie the engagement with the threaded portion of the said body portion of said lock nut‘ 3. In a locking device for tensioning a bolt of 40 ‘bolt by straightening of the dished portion caused by rotation of the locking member against the the type adapted to fasten together bearing parts cap, the tongue on the cap having a portion bend of a connecting rod, said bolt having a threaded able outward so as to engage the locking meme end portion provided with a slot, a serrated nut her for preventing rotation of the same with re threaded to engage said bolt threads and to bear against one of said parts for tensioning said bolt, 45 spect to the bolt. a cap apertured to receive said bolt end portion and having a portion thereof serrated to engage ALEXANDER G. HERRES‘HOFF.