US1373645A - Anchoring device - Google Patents

Description

E. A. M. BANDOLY.

ANCHORING DEVICE.

APPLICATION FILED OCT- 4. 1920.

1,373,645. I I Patented Apr. 5, 1921.

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UH'EBD EBIGH M.

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DIEWMWL m max-rum application filed tictcber 4,1921). Serial No. M l-shift.

, vices; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make! and use the same.

, ,My invention relates to fastening devices I suitable for use in some of the compressible materials, such as wood, its general objects being to means for automatically anchoringan object inserted in a here, so that the inserted object will be able to resist the strains tending to withdraw it. More particularly, my invention relates to nuts suitable for use in connection with machine screws or bolts as substitutes for-wood screws in affording permanently secure fastenings. In this aspect my invention aims to provide a nut adapted to be driven into a bore in the wood and so equipped that theinserted nut will be socurely locked against rotation, that it will offer a decided resistance to the screw or bolt tending to withdraw itirom the bore, and

that it will automatically lock itself against withdrawal after a relatively short outward movement due to such a strain.

In constructing phonograph cabinets, piano cases, ofiice furniture and the like,

much trouble has heretofore been experienced owing to the loosening of the -wood screws used for fastening the various parts to one another. This difliculty has been all the more serious where the demands of haste have not allowed ample time for the proper drying of the wood, as has been true owing to business conditions brought about by the recent war. Consequently, muchdissatis" faction has resulted from 3 the loosening of wood screws due to the"gradual,shrinking of the wood on objects inwhich these screws were originally quite firmly tightened, and

hea losses have been encountered owing to t e rejection and return of the goods, which proved defective on t is account. Likewise, if either the manufacturer orthe purchaser attem ted an adequate tightening of the screws,th1 s has sometimes resulted in a stripping of the thread in the wood and a consequent damaging of the object.

Moreover, the relatively li pitch of wood screws-always makes it easy' for them to Specification of Letters Patent.

provide simple and inexpensive a ing nut Patented Apr 5 work loose as compared. withthe similar pitch of machine screws of corresponding diameter, so that for really permanent fastenings, the machine screws afford decided advantages. a Y

My invention aims to provide means whereby these advantages of the machine screw thread may be employed when male ing fastenings in wood, more particularly aims to provide can easily be embodiedin the wood and drive nut which which wiil effectively anchor itself so as to V afford a firm operative connection between the wood and a screw or bolt having a regu lar machine screw thread. Still i'urther and more detailed objects will appear from the following specification'and fromthe accompanying drawings, in which drawings- Figure 1- is an elevation of a self-anchorsigned for insertion in abore' corresponding in diameter to the diameterof the tapering capof the nut. v x

Hg. 2 1s a fragmentary central and lon gitudinal section through the same nut and through the tail end of a machine screw or bolt associated therewith showingthis nut as it appears after it has a bore in a board and before it has been subjected through the screw or bolt to a strain tending to withdraw the nutfrom the bore.

Fig. 3' 1s a similar section, showing the manner in which the same nut anchors itself in the wood when the screw or bolt associated therewith has moved the nut for a relatively short distance in attempting to withdraw the nut from the bore.

'Fig. i is a transverse section through the self-anchoring nut of Figs. 1 to 3 inclusive,

embodying my invention and debeen driven into taken along the correspondingly numbered a line in Fig. 1. p

Fig. 5 is an elevation of another embodiment, namely aself-anchoring nut having a plain cylindrical tail piece and having both its shank and its anchoring collar hexagonal incross-section.

Fig. 6 is a transverse section through the embodiment of Fig. 5, taken'along the correspondingly num' cred line in that figure.

In the embodiment of the first three figures of the drawings, of my invention comprises a metal cap nut having a tapering tip 1 connected to a rear end portion 2 by a shank 3 of a diameter somewhat smaller than that of the parts 1 and 2. 'llhecap 1 is desirably of a diameter the fastening device so that these'ribs will then prevent the nut from being'rotatedin the bore.

Surrounding the medial shank 3 of the nut is a collar 4 which is desirably formed of spring metal and which has a series of prongs 5 formed from it intermediate of its ends.- These tongues all extend toward the tailportion2 of the nut and initially are sprung slightly outward from the axis of the collar so that the tip or free end of each tongue initially projects for a distance somewhat greater from the axis of the collar than the radius of the bore in which the resulting fastening device is to be inserted. Conse quently, when the device (consisting of the said nut and collar) is driven into the bore, the resiliency of the tongues will force their, tips to engage the wall of the bore, and a retractile movement of the collar will therefore cause these tips to indent themselves into the wood." To augment this action, I

provide the cap 1 with a square shoulder at its juncture with the shank 3, so that the forward end of the collar will engage this shoulder, and I also desirably form the said tongues so that their tips will be acuteangled and therefore more re'adyto dig into the "wood. I also desirably arrange the tongues 5 in a pair of rows extending circumferentially of the collar and with the tongues in successive rows in staggered relation to each ,other,-whereby I increase the number of points at which the collar is engaged with the wood without unduly weak suing the collar.

In practice, I have found such. a fastening device to be particularly suitable for use in connection with machine screws as substi 'tute's for the wood screws heretofore used in assembling parts of automobiles, phonograph cabinets and various items of furniture. For such purposes, the bore in the wood is desirably made a little in excess of the depth required for the nut, and my fastening device is driven into this bore until its rear on has entered the bore for some distance behind the mouth of the latter. The resulting space between the extreme rear end of the nut and the surface of the wood then allows for a partial retracting of the nut by the'initial pull of the screw or bolt 7 which is threaded into this nut. .That is to say, when the strain is placed on this screw, the hurling on the rear portion 2 prevents the latter from turning with the screw or bolt, so that the nut slides lightly backward toward the mouth of the hole without rotating. During this sliding move naraeea ment of the nut, the engagementot the for Ward end of the collar 4 with the adjacent shoulder on the head 1 moves the collar backward also, thereby causing the tongues 5 to dig into the wood and gradually to turn outward at an increased angle withthe axis of the nut, after the manner shown in Fig.

wood screws, I can obtain a security offastoning farin excess of that aiiorded by the latter. I

However, while I have heretofore de scribed my invention in a highly desirable embodiment, I do not wish to be limited to the details of construction and arrange ment thus disclosed, it being obvious that various additions, omissions or other changes might be made without departing from the spirit of my invention. For .,.example, the nurling of the tail portion may not be ample to prevent a rotating of the nut when the same is made for large sizes of screws or bolts. For these larger forms, I may employ a smooth cylindrical tail 8 as shown in Fig. 5 and may employ a shank 9 of hexagonal cross-section and I'may use a collar 10 of correspondingly angular cross-section. Thus arranged, the forcible engagement of the tips of the tongues with the wood will prevent the collar from rotating, and the interlocking of the angularly sectioned collar with the shank of the nut will prevent the latter from rotating within the collar, hence the tongues 'will simultaneously anchor the nut both against retraction and against rotation.

I claim as my invention: 1. A self-anchoring nut or the like comprising a main member equipped intermediate its ends with a peripheral groove, and a collar seated. in the said groove and having outwardly projecting tongues formed there from and all extending in the same direction. longitudinally of the collar.

2. A self-anchoring nut or the like COHL' prising a main member having a pair oft ends of substantially equal diameter connected by a shank of relatively smaller diameter, one of the. said ends having formations directed radially outward therefrom; and a collar of resilient material surrounding the said shank and equipped with tongues all extending toward one of the said ends and all having their tips normally forced outward by the resiliency 01" the tongues beyond the periphery of the collar.

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3. A self-anchoring nut or the like comprising a main member equipped intermediate its ends with a peripheral groove, and a collar seated in the said groove and having outwardl projecting tongues formed therefrom and all extending toward the tail end thereof; the main member having a longitudinally fluted tail end of larger effective diameter than the main portion of the collar, whereby the flutes thereof are adapted to indent themselves in the walls of the bore slidably entered by the main portion of the collar so as to lock the main member against rotation.

4;. A self-anchoring nut comprising a peripherally grooved main member slidably fitting the bore into which the nut is to be inserted, and a collar disposed in the said peripheral groove and having resilient tonguesyieldingly e a in the said bore the collar being form il gf gsin 1e piece of sheet material wrapped around t egrooved part ofthe said" main member and the tonglies being. integral with the collar.

5; or anchoring a peripherally ooved nut in a bore completely housing t e said nut, a collar disposed in thesaid groove and having resilient tonguesieldingly engaging the said bore and al directed toward the moutli of the bore, disposed in a plurality of rows extending circumferentially of thecollar and with the tongues in adjacent rows in relatively staggered relatio Signed at Chicago, Illinois, September 30th; 1920. r

ERIGH A.- 1x4 BANDOLY.

the tongues being

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