US2562019A - Tubular rivet - Google Patents

Description

R. S. COLLEY TUBULAR RIVET July 24, 1951 Filed Aug. 29, 1947 ilzr llllvwl v A; Z522% j v needed to accommodate relatively thickwork.

Patented July 24, 1951 RIVET Russell S. GOlIey-Kent, filifiiogassiigiiorito B. F. Goodrich 'Gompany-,'-Newreek, Y a corporation of'New York I I Application August 29, 19 16 7, Serial lilo. 3T7 1, 231

fbore'extending in from the head end providing a relatively thin wall adapted to be outwardly bulged against the work and'terminatin'g in a threaded portion 'engageable with a drawrbdof a heading tool.

- The prior rivet, while being-capable of accominodating variations in work thickness, sometimes re'ferred to as grip range, has been limited Claims. 1; 103

in the range ofsuch thickness throughout which 7 themost effective upsetting can be effected, this range having been dependent to a large extent upon the ratio o'f slenderness oi the wall of the 'cb'unterbored portion which is outwardly bulged in the upsetting operation. The mater-ialvavailable for outward bulging has been that :part of the'wau of the counterbored portion between the work and the first thread convolution, and the recommended grip range has of necessity been considerably less than the total length O'f the counterb'ore.

the counterbore, to the end of increasing the 'grip ra'nge, has had the objection that for very thin work and for very thick work, the bulge has sometimes been formed in a faulty manner-so An object of this invention is to provide a. tubular rivet of an improved construction for .ac-

' :commoda-ting 'work over an increased range of Jthicknesses. Further objects are to provide a I atubular rivet having-a wall construction suchthat ,,-itmay be outwardly bulged for strong gripping rofwork both of very small thickness and, of relawork thickness, to provide an internal thread construction inwhich the thread does not begin withsabruptfull depthbut is of gradually increasing depth, thereby making a portion of the ,threaded region capable of outward bulging as 2 1s an elevation-Dram 1ivet sliown in rag.

-Mere extension of the length of v although the pitch and root of these threads rel in the upset condition as applied to relatively thin work with a draw rod and setting anvil of'a lie ding to'o'l before the latter are reihoved ipa'itsfbei'ng sectioned and broken away.

' ig. '3 "is fasebtional elevation of the rivet in the upset C nditioh as applied to relatively thick were, parts being broken away. p

Fig. 4 is a perspective view of the rivet prior to insertion in the work.

In accordance with the "invention a tubular rivet H! as it appears before upsetting is shown in Figs. 1 and 4. The rivet I9 comprises'a shank 'I LKWhichImay be flanged at one end to form a head [2, and has a bore extending 'th'e'rethrough.

The here is 'tnreadedat 1'! for receiving 'ascrew for a heading tool for upsetting the rivet "It and for'frece'iving a screw of a bolt after upsetting of the rivet. The wall of the shank H is "of greater thickness at the threaded portion ['4' than at-the portion adjacent the head end 1? and gradually decreases in thickness toward the head end; Although a decrease in thickness "may be obtained progressively in any "suitable manner it is -piefe'rred to obtain this by tapering the wall in "thickness toward the head end, as by tapering the bore from the head end to an angle such as is indicated by the broken lines l3, I3;

The tapered wall portion extends into the threadedportion 14 andfthe crestoi' the threads toward the/head end 12 conform to the taper n -thesam'e. 'By removing part of these threadsfthe load imposed in upsetting the rivet is "distributed "more evenly over the wall and is not thatrfull holding strength has not been obtained.,.-; 5 iioncentrated inafew threads.

Infi'i'g' 2 therivet [-0 is shown in the upset con- -dition gripping -'vv o'rk it: which may comprise that; inore'thin sheets of metal or other material. The sheet member i5 is apertured atI 6 to receive "the rivet -10. in order to upset the rivet l0 it is inserted in the sheet mernber it with the name of the head-end i2 against the on. r 'surface of the wall'of the sheet member. draw rodl1=-of a'heading tool is threaded to "e"ifga-ge' the threaded portion 1 of the shank M. phe dra'w-rod H is pulled toward-asetting arivil 1 8 of the heading tool which movement subteens "the sha'nkto an axial upsetting force throughthe threads"of the'shank. Th'e upsetting *ioroe 'is applied with circumrerential uniformity by virtueof the threaded-connection which assures uniform pressure application entirely und-the-rivet b'ythe draw rodll. The taper o ane-"shahk-peruon H causes the wall portion having thelea'st resistance to outward "bulging to be aidriacent the wall of the sheet member 1-51as the shank wall thickness is progressively greater -=away rrem-the 'work, 'andthe wall is? substantially supported the aperture- 16 of the sheet :mem- "Her l 'i' toviidrd the head end- H. A coereeuy sults upon upsetting as shown in Fig. 2. The heading tool may be removed by unscrewing the draw rod 11 whereupon the rivet l not only is held in the work but produces internal threads in which a holding screw may be inserted for attachment purposes if desired.

In Fig. 3 the rivet I0 is shown in the upset condition gripping asheet member 20 of greater thickness than the sheet member I5 shown in Fig. 2. Because the position of outward bulging is determined by the thickness of the sheet member the same size rivet grips the relatively thick sheet member 28 with effectiveness, a part of the tapered and threaded wall being bulged in this application.

It is evident that a considerable range of thicknesses of work may be accommodated by the rivet of the invention. This is highly desirable for reasons among others of reducing the number of rivet sizes needed to accommodate the variety of thicknesses of work which may be used with this rivet.

Variations may be made without departing from the scope of the invention as it is defined inthe following claims.

I claim:

1. A tubular rivet adapted to be upset in work b outward bulging of the wall of the rivet under an axial upsetting force and axial pressing of the bulge against the face of the work, said rivet comprising a shank having a bore extending therein from an end thereof and having a cylindrical threaded portion, the root diameter of the threaded portion being uniform throughout and the wall of the shank being gradually reduced in thickness from said threaded portion toward said end providing for outward bulging anywhere along the extent of the reduced wall thickness as determined by the thickness of the work against which the bulge is pressed in the axial direction.

2. A tubular rivet adapted to be upset in work by outward bulging of the wall of the rivet under an axial upsetting force and axial pressing of the bulge against the face of the work, said rivet comprising a shank having a bore extending into said shank from an end thereof, said shank being internally threaded with the root diameter of the threaded portion being uniform throughout and the wall of the shank being gradually reduced in thickness toward said end providing for outward bulging anywhere along the extent of the reduced wall thickness as determined by the thickness of the work against which the bulge is pressed in the axial direction. 3. A tubular rivet adapted to be upset in wor by outward bulging of the wall of the rivet under an axial upsetting force and axial pressing of the bulge against the face of the work, said rivet comprising a shank having a head end and a bore extending into said shank from said head end, said bore tapering away from said head end and terminating in a cylindrical portion thereof for outward bulging anywhere along the extent of the tapered wall thickness as determined by the thickness of the work against which the bulge is pressed in the axial direction, said cylindrical ing a head end and a bore extending into the shank from said head end terminating in a threaded portion for engaging a threaded up- 1 setting member to upset the rivet by outward threaded portion, thereby providing for outward bulging anywhere along the extent of the tapered wallthickness against which the bulge is pressed in the axial direction.

5. A tubular rivet adapted to be inserted in an aperture in sheet workmaterial and upset therein from one side of the work to grip work by outward bulging thereof and axialpressing of the bulge against the face of the work, said rivet comprising a tubular shank having a flanged head at one end thereof and a bore extending into the shank from said head and terminating in a threaded portion for engaging a threaded upsetting member, said bore being tapered away from said head with the thread depth reduced in height in accordance with said taper, thereby providing for outward bulging anywhere along the extent of the tapered wall thickness as determined by the thickness of the work against which the bulge is pressed in the axial direction.

6. A tubular rivet adapted to be upset in work by outward bulging of the wall of the rivet under an axial upsetting force and axial pressing of the bulge against the face of the work, said rivet comprising a shank with a substantially uniform outer diameter having a head end and a bore extending into said shank from said head end, said bore tapering away from said head end providing gradually changing wall thickness for outward bulging anywhere along the extent of the tapered wall as determined by the thickness or the work against which the bulge is pressed in the axial direction, said bore terminating in a cylindrical portion having a thread therein which extends into and along the tapered portion ofthe bore.

7. A tubular rivet adapted to be inserted in an aperture and upset therein from one side of they work to grip the work by outward bulging thereof and axial pressing of the bulge against the face at the opposite side of the. Work, said rivet comprising a shank having a bore. extending into said shank from an end thereof and a threaded portion at the other end of said shank with a uniform root diameter not greater-J than the diameter of said bore at the first-mentioned end for engaging an upsetting tool inserted in the bore from said first-mentioned end, said shank having a wall of gradually decreasing thickness toward said first-mentioned end to provide for said outward bulging anywhere alongthe extent of the gradually decreasing wall thickness as determined by the thickness of -the work against which the bulge is pressed in the axia direction. a

8. A tubular rivet adapted to grip work by outward bulging thereof and axial pressing of the bulge against the face of the work, said rivet comprising a shank of substantially 'uniform outside diameter having a bore extending-into said shank from an end thereof and being internally threaded at the other end of said. shank with .the

i diameter of said bore at the first-mentioned end being at least as great as the diameterof the thr a r s and th di me er; 0.1: t e t r ad roots being uniform throughout, said bore taper- REFERENCES CITED ing away from said first-mentioned end of the shank toward said other end in a manner such g flggg ggf fff are of record m the that threads located in the tapered region have crests conforming to said taper to provide a 5 UNITED STATES PATENTS tapered wall thickness for said outward bulging Number Name Date anywhere along the extent of the tapered wall 1,678,931 Blumberg July 31, 1928 thickness as determined by the thickness of the 2,088,358 Adams July 2'7, 1937 work against which the bulge is pressed in the 2,324,142 Eklund July 13, 1943 axial direction. 10 2,3 9, Dexter Oct. 3, 1944 RUSSELL S. COLLEY. 2,3 ,96 Johnson Jan. 9, 1945

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