US1186004A - Bolt-anchor. - Google Patents

Description

um TED sTATEs PATENT oEEic JOSEPH KENNEDY, OF NEN YORK, N. Y., ASSIGNOR TO THE CLEMENTE COMPANY, A CORPORATION OF NEW YORK.

BOLT-ANCHOR.

Application filed August 14, 1913.

To (Illu/710m it may Concern Be it known that I, JosErH KENNEDY, a. citizen of the United States, and a resident of New York, county of New York, and State of New York, have invented certain new and useful Improvements in Bolt- Anchors, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to bolt anchors and more particularly those of the expansible type and its object is to provide a simple and inexpensive device which may be used in walls of concrete or other material, to form a durable and effective hold for the threads of a bolt.

In order that my invention may be thoroughly understood, I will describe my invention 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 a simple form of expansion bolt made according to the present invention. Fig. 9. is a transverse 'section taken on the line 2-2 of Fig. l. A

modification of the form of the bore of the device of these figures is shown in transverse elevation in Fig. 3. A somewhat similar expansion bolt is shown in longitudinal section and end elevation in Figs. 4 and respectively, with a modified form of the outside of the device shown in end elevation in Fig. 6. Another modification of structure is illustrated in longitudinal elevation partly in section and in transverse section ln Figs. 'T and S respectively.

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

In all of the drawings the bolt anchor comprises a hollow shell 10 which is split lengthwise so that it may expand when abolt is screwed into it. This may be accomplis-hed by a single slit such as 11 in Figs. 1 1nd 2 which extends throughout the length of the shell, or by a plurality vof such slits such as shown at 12 and 13 in 3 for example, which divide 'the shell into a. plurality of segmental parts. It is not necessary that these slits be on straight lines parallel with the axis of the shell for they may if desired be on helical lines as at 14:, Fig. t.

The inside of the shell is provided with neans for receiving the threads of a bolt Specication Aof Letters Patent.

Patented June (i, 1916.

Serial No. 784,8?4.

20 of soft metal projecting into the bore into .y

which the inserted bolt may cut its own threads. rIhe ends of these lugs lie in an imaginary surface, the cross-section of which is elliptical or other form of non-uniform diameter, the maximum diameter being at the slit 1l and being but slightly greater than the diameter of the bolt which is to be used with the device.

A slight modification of the bore of the shell is shown in transverse section in Fig. 8, in which the ends of the lugs lie in surfaces the sections of which are the sides of a flattened polygon. v

This device is used by drilling a hole in the wall, ioor or other structure of such material as will not readily receive the threads of a bolt., embedding the device in the hole and then inserting the bolt which, while it cuts its own thread in the lugs 9,0, forces the shell apart o-r expands it so that its outer surface is' forced against the surface of the hole in which it is inserted.

In order to oppose any tendency of the shell to rotate in the hole when the bolt is being screwed in, the outside of the shell may be made oval as is shown in Fig. 3. Or it may be provided with outwardly projecting ribs which may be interrupted as at 2l in Figs. 1 and l.' rI`he ends of these projecting ribs may lie in an imaginary surt face elliptical in cross section as in Figs. 2 and 5, or the cross-section of which is in the form of a flattened polygon as in Figs. 3 and 6. In both of these arrangements the shorter ribs are on the surfaces of the shell' which are moved away from each other when it is expanded.

The form of my invention shown in Figs. 4, 5V and 6 is internally threaded, as at 15.

V'Vhenthis construction is used it is desirable to have the threaded bore taper inwardly Vtoward the inner end o-f the shell.

It is not necessary that the projecting ribs be parallel with the axis of the shell and in Figs.4 7 and 8 I have shown the shell prolll hen the holes in which bolt anchors of this general character are to be used, are drilled by hand, the outer ends of the holes are usually larger than the rest of it. For this reason it is often desirable to flare the outei` end of the shell. This construction causes the shell to center its outer end in the hole and also causes it to more completely lill the outer end of the hole and thus present a more finished appearance. ln Fig. 7 the structure shown has both the shell itself flared and the ribs 2l made higher near the outer end of the shell.

The arrangement of projections set forth and described is such as to produce the best results.

Short projections are near the line of division between parts where they do not prevent the spreading of the parts, but do hold to some extent owing to the `granular surface of the hole. 'lhey are primarily intended to hold the anchor in the center of the hole. The longer projections, which are located between the lines of division and eX- tend beyond an imaginary cylindrical surface corresponding to the hole, are adapted to be somewhat collapsed when the anchor is driven into the wall, but before they are collapsed and while they are being collapsed they cut into the wall so that when the anchor is ready for the bolt, it is held in the wall with considerable security, enough at least to prevent rotation of the anchor. The insertion of the bolt then spreads the pairs to complete the grip and during this operation, the short projections, as already eX- plained7 hold the anchor in the center of the hole.

The irregular or helical division line between the parts of the anchor eectively prevents longitudinal displacement of the two parts and renders the use of interlocking projections or other means for accomplishing` his purpose unnecessary.

In this application several different struetures which embody my invention are illustrated and described. This is to show that l intend no other limitations than those in the appended claims as the invention may be utilized in structures of widely different form and design.

lVhat l claim is:

l. An expansion bolt comprising a hollow slitted shell, projections from the surface thereof, the ends of said projections lying in an imaginary surface, the cross-section of which is a geometrical ligure having a smaller dimension across the plane in which the shell is slitted than it has in the direction at right angles thereto.

2. A bolt anchor comprising a hollow slitted shell, means within said shell for re ceiving the threads of a bolt, and holding members projecting from the outer surface of the shell in such a manner that a line drawn through the outer ends of said projecting members is nearer the center of the shell at two diametrically opposed points than it is at two similar points midway between the aforesaid points.

3. A bolt anchor comprising a two-part hollow shell separated along diametrically opposed lines, .means within the shell for receiving the threads of a bolt, and holding members projecting from the outer surface of the shell in such a manner that the ends of said members near the lines between the parts of the shell are carer the central axis of the shell than are the ends of the holding members between said lines of separation of the parts of the shell.

4. A bolt anchoicomprising a two-part hollow shell separated along` diametrically opposed lines, means within the shell for receiving the threads of a bolt, and holding members projecting from the outer surface of the shell in such a manner that the ends of said members are in an imaginary surface, the cross-section of which is a curve of non-uniform diameter with the shortest diameter thereof near the lines of separation of the shell.

5. A bolt anchor comprising a two-part hollow shell separated along diametrically opposed lines, means within the shell for receiving the threads of a bolt, holding members projecting from the outer surface of the shell unequal distances from the axis of the shell with their maximum distance of projection from said axis intermediate the lines of separation of the shell.

6. A bolt anchor comprising a two-part hollow cylindrical shell. of hard metal separated along diametrically opposed lines, screw-threads formed in both of said parts converging toward the inner' end of the shell, holding members projecting from the outer surface of the shell unequal distances from the surface of the shell with their maximum distance of projection from said surface intermediate the lines of separation of the shell.

7. An expansion bolt comprising a hollow shell longitudinally divided alongl diametrically opposed helical lines.

8. An expansion bolt comprising a hollow shell longitudinally divided along helical lines.

ln testimony whereof, I have hereunto set my hand in the presence of two subscribing witnesses this 11th day of August, 1913.

JOSEPH. KENNEDY.

Witnesses I. B. MOORE, EDNA ZINMAN.

copies of this patent may be obtained for ve cents each, by addressing the Commissioner @t Patents Washington, D. e.

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