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Publication numberUS1320623 A
Publication typeGrant
Publication dateNov 4, 1919
Filing dateJun 16, 1917
Publication numberUS 1320623 A, US 1320623A, US-A-1320623, US1320623 A, US1320623A
InventorsJoseph Kennedy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1320623 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




1 20,623. Patented Nov. 4, 1919.




Specification of Letters Patent.

Patented Nov. 4, 1919.

Original application filed June 16, 1917, Serial No. 175,058. Divided and this application filed October 10,

To all whom it may concern:

lie it known that I, JOSEPH KENNEDY, a citizen of the United States of America, and a resident of Richmond Hill, Queen's county, and State of New York, have invented certain new and useful Improvements in Expansion-Anchors, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to expansion anchors for bolts and its object is to provide a simple 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. lVIorc specifically, its object is to provide a structure which under longitudinal pressure will collapse longitudinally along predetermined transverse lines to thereby expand outwardly against the wall of a hole in which it is placed and contract inwardly against the bolt it is designed to hold.

This application is divided from a copending; application for patent Serial No. 175,058 filed June 16,1917, and relates specifically to the type of anchorage disclosed therein, in which the anchorage structure is weakened along longitudinal lines in order to facilitate its collapse in operation.

In order that my invention may be thoroughly understood I 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: 4 Figure 1 is a sectional longitudinal elevation of an expansion anchor made according to and embodying my invention shown inserted in 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 an elevation of the anchor shown in the preceding figures.

Fi at is an elevation of an anchor of modidied construction which also embodies this invention.

Fig. 5 is an elevation of a bolt with the anchorage member of Fig. e shown in section, and illustrates the way in which this form of the device is used.

Fig. 6 is a sectional longitudinal elevation of an expansion anchor of a modified form Serial No. 257,541.

tube threads 12 are rolled intotube 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 collapsing of the tube is facilitated by providing longitudinal weakenings such as the slots 36. These are shown extending completely through the walls and for a greater part of the length of the anchor, a structure of this kind being readily formed from sheet metal in a well known manner.

' The anchor may be made in more than one piece as shown in Fig. %i, in this case of two similar pieces 37 and 38. Such parts may be stan'iped readily from sheet metal.

Before describing specifically the structure illustrated in the other figures of the drawings, I will point out the manner in which this device is used. A. hole is drilled in a w vll 15, for example, of sufficient depth and diameter to receive the tube as shown in Fig. 1. 16 is an object which is to be 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 thecreases 13 and 1e. This will increase the crimps in the 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 of the tube at the lines Ll into the wall of the hole Thus a firm anchorage with the wall is formed and at the same time that tube is crushed in against the bolt so that the latter has no clearancce and is incapable of lateral movement which might in time loosen the anchorage. The parts will have assumed some such positions as those illustrated in Fig. 2.

In the structure shown in Fig. 6, 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 diame- 7 ter and is PI'OVlflGCl'Wltll cast-or cut threads 21. Art spaced intervals grooves 22*are cut transversely through the inner surface of the bore 20. Between these rooves others designated 23 are (full in the outer surface. These. grooves 22 and 23 are of suilicient depth, dependent upon the kind of metal I-of which the tube is made to insure l'tS buckling in and out when subjected to longitudinal pressure produced by turning the bolt in the threads 21. v I

The parts'37 and 38 of Figs. 4; and 5 are transversely corrugated. When these are used they are placed over the shank 30 of a bolt, between its head 31 and the object 16 which is moved toward the bolt head 81by'the nut32. r

I intend nolimitations other than those imposed by the appended claims.

W' hat I claim is:

1. A bolt anchor comprising a member having longitudinally separated parts, each provided with means for causing said member when subjected to longitudinal pressure, to be crimped onto a'bolt and against the wall of a hole in which it isinserted.

A bolt anchor comprising a member having longitudinally separated parts each provided with spaced laterally contracted and expanded portions and adapted when subjected to longitudinal pressure to be crimped onto a bolt and against the wal of a hole in which it is inserted.

3. A bolt anchor comprising a tubular member having a slotted portion through a part of its length adapted to collapse longitudinally and expand inwardly and outwardly when subjected to longitudinal pressure.

4;. A bolt anchor comprising a tubular member having a longitudinal slotted portion provided with transverse corrugations and adapted to collapse longitudinally and Copies of thispatent may be obtained for expand inwardly and outwardly when sub jet ted to longitudinal pressure. 7

5. A bolt anchor comprising a tubularmember having a longitudinally sloted portion provided with equally spaced means thereon for causing said slotted portion to become crimped at equally spaced trans verse lines when subjected to longitudinal pressure; g

6. A' bolt anchor comprising a tubular member provided nearone end with threads adapted to receive the threads of a boltinserted through the tube,'said member having a longitudinally slotted portion, and means for causingsaid member when subjected to longitudinal press'ure'to be crimped onto the bolt and against the wallsoi" a hole in which it is inserted. 7. A bolt anchor comprising a tubular member provided near one end with threads adapted to receive thethreads oi a bolt inserted through the tube, said member hav-a ing a longitudinally slotted, portion pro.-

vided with equally spaced. means thereon pressure,

In witness whereof, have hereunto set my hand. this 7th day of October, 1918.3


five cents each, by addressing the flbommis s ion'er OfIate'nts, Washington, D. G. i 1

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2647000 *Oct 21, 1948Jul 28, 1953Goodrich Co B FAngular tubular joint assembly
US3657955 *May 14, 1970Apr 25, 1972Mckay Thomas LBlind fastener with expandable collar
US3962843 *Jul 12, 1973Jun 15, 1976King John O JunResilient sleeve joint construction
US5401131 *Jul 9, 1993Mar 28, 1995Yoshino Seiki Inc.Expansion anchor
US5437674 *Aug 25, 1993Aug 1, 1995Alexandre WorcelOsteosynthesis device
US20070264099 *May 10, 2006Nov 15, 2007Joker Industrial Co., Ltd.Expansion screw
U.S. Classification411/38, 411/929
Cooperative ClassificationF16B13/061, Y10S411/929