US1320622A - Joseph xemtedy - Google Patents

Description

Patented Nov.

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JOSEPH KENNEDY, OF NEW YORK, N. Y., ASSIGNOR TO 3'. EDWARD OGDEN, OF

' MOUNTAINVILLE, NEW YORK.

, EXPANSION-ANCHOR.

incense.

My invention relates to expansion anchors for bolts and it object is to provide a sim' ple and inexpensive structure by means of which bolts may be securely fastened to material of such character that their threads will not satisfactorily engage therewith. More specifically, its object is to provide a structure which under longitudinal pressure will collapse longitudinally alon predetermined transverse lines to there y expand outwardly against the wall of a hole in which it is placed and contract inwardly against the bolt it is designed to hold.

In order-that my invention may be thoroughly understood 1 will now proceed to describe the same in the following specification, and then point out the novel features thereof in appended claims.

Referring to the drawings:

Figure 1 is a sectional longitudinal elevation of an expansion. anchor made according to and embodying my invention shown inserted in a hole before expansion and with a bolt in position.

Fig. 2 is a similar view of the same parts in the positions they assume after expansion.

Fig. 3 is a sectional elevation of a modified form of my invention.

Figs. 4, 5, 6 and 7 are fragmentary sec tional elevations illustrating modifications of construction of a'bolt anchor of the type shown in Fig. 3. I

Fig. 8 is a sectional elevation of a still further modification of structure.

Fig. 9 is an elevation of an anchor which constitutes an embodiment of my invention and is a modification of those shown in Figs. 1 and 2.

Like characters of reference designate corresponding parts in all the figures.

'10 designates a bolt. in Figs. 11 and 2, 11 is a metallic tube surrounding thi bolt circumferentially, that is, the metal of the tube is continuous and unbroken by longitudinal slots. The tube has an internal 5 diameter slightly larger than the diameter Specification of Letters Patent.

forming a part thereof...

wall of the hole.

a is provided with cast or out threads 21.

Patented Nov. 4t, lliiltl.

Applimtion filed. June 16, 1917. Serial no. 175,053.

of the bolt. At the inner end of the tube threads 12 are rolled into tube in such a way as to reduce the diameter of the tube at this part and of such size and pitch as to fit the threads of the bolt.

The rest of the tube i creased and crimped inwardly at preferably equally spaced distances as at 13 but these crimps are not deep.

enough to interfere with the insertion of the bolt. Between the lines 18 the tube is creased and crimped outwardly as at 14-.

Before describing specifically the structure illustrated in the other figures of the, drawings,'1 will point out the manner in which this device is used. A hole is drilled in a wall 15, for example, of sufficient depth and diameter to receivethe tube shows in Fig. 1. 16 is an object which is to he fastened to the wall. The bolt 10 is passed through the object and through the tube into the threads 12. Tightening the bolt will put longitudinal pressure upon the tube which will collapse under this pressure along lines predetermined by the creases l3 and M. This will increase the crimps in the 09 metal which will thus have a tendency to fold up like an accordion. The inward displacement of the metal at the lines 13 is of course limited by the shank of the bolt, and this limitation will assist in forcing the metal ed the tube at the lines 14 into the lhus a firm anchorage with the wall isformed and at the same SOl that the latter has no clearance and is incapable of lateral movement- .which might in time loosen the anchorage. The parts will have assumed some such positions as e those illustrated in Fig. 2.

in the structure shown in Fig. 3, the tube 11 is made of thicker metal. it is constructed with a clearance hole 20 for the bolt 10. its inner end is of smaller diameter and nut spaced intervals grooves 22 are cut transversely through the inner surface of the bore 20. Between these grooves others designated 23 are cut in the outer surface. These grooves 22 and 23 are of sufiicient depth. dependent upon the kind of metal of which the tube is made to insure its buckling in and out when subjected-to longitudinal pressure produced by turning the bolt in the threads 21.

It is not necessary to have both inner and ice outer grooves. The inner grooves 22 may be I used alone as shown in Flg. 4 or the outer grooves 23 may be used. alone as shown in 'Ihe specific means for insuring the crimping of the metal at desired transverse lines is not an essential part of this invention. For example, the tube 11 may have inwardly tapered transverse slots such as 24 in Fig. 6, cut through its surface on the desired lines, or the slots may taper outwardly as at 25 in Fig. 7, if desired. These transverse slots do not interrupt the circumferential continuity of the metal.

Fig. 8 shows a transversely corrugated tube 11 of comparatively thin metal. In

' this case a bolt and nut are illustratedto show that the invention is not necessarily limited to a structure with threads to be engaged by the threads of the bolt. In this Fig. 8, the bolt is designated by 30, its head by 31 and its nut by 32. It may be seen that with this structure screwing the nut onto thebolt or screwing the bolt intothe nut will produce longitudinal pressure on the tube, and that this pressure will cause the tube to collapse to displace its metal both inwardly and outwardly.

The transverse crimps are not necessarily annular in form and may, for example, be made in the form of a helix as shown in Fig. 9 and designated 35. In fact, they may be unevenly spaced and irregular in form if de sired. I a.

I have illustrated and described several structures which embody this invention in.

order to show that it is capable of wide structural variation and to show that I do not intend to limit myself to any specific form'or construction. In fact I intend no limitations other than those imposed by the following 'claims.

What I claim is:

1.- A circumferentially continuous tube adapted to receive a bolt and provided with means to cause the tube to fold on a plurality of spaced transverse lines'when subjected to a longitudinal pressure.

spaced laterally contracted and expanded portions, and adapted to be crimped onto a bolt and against the walls of a hole in which it is inserted, when subjected to longitudinal pressure.

4:. A circumferentially continuous tube provided near one end with threads adapted to receive the threads of a bolt inserted through the tube, the unthreaded part of the tube being provided with spaced laterally contracted and expanded portions,. and adapted to be crimped onto a bolt and against the walls of a hole in which it is inserted, when subjected to longitudinal pressure 5. A circumferentially continuous tube provided near one end with; a contracted portion constructed with threads for receiving the threads of a bolt inserted through the tube, the unthreaded part of the tube being creased and crimped inwardly and outwardly and adapted tobe crushed and folded by longitudinal pressure produced thereon by turning a bolt in said threads to thereby force the metal of said tube at the inwardly crimped parts thereof onto the bolt and to force the metal thereof at the outwardly crimped parts against the wall of a hole in which it is inserted.

6. A bolt anchor comprising a circumferentially continuous tubular member embodying means to cause the member to collapse longitudinally and expand laterally when subjected to longitudinal pressure.

In witness whereof I have hereunto set my hand this 8th day of June, 1917.

. JOSEPH KENNEDY.

Witnesses:

WILLIAM G. DALTON, I. B. Moons.

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