US966024A - Bolt-anchor. - Google Patents

Description

T. P. KELLER.

BOLT ANCHOR.

AJPPLIUATION FI ED 13 30.30, 1909.

966,024. Patented Aug. 2, 1910.

INVENTOR- WITNESSES:

U W 1 i I all whom it may concern: I

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PATEN um: lea.

TRAUGOTT F. KELLER, OF BROOKEYN, NEW YORK.

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Be it known that LTBAUGOTT F. KELLER,

a citizen of the United States of America,

. hole and theboltsecured to the anchor.

The particular class of bolt anchor 'to which my invention relates is that in which a soft metal segmental shell is employed into which the boltis forced; whereby threads are formed by the bolt upon the interior of the shell and the exterior of the shell is caused to'conform substantially to the contour of the hole. I

' My invention consists essentially in a segmental shell of this character, preferably substantially cylindrical upon its exterior and having a longitudinal bore theret-hrough which is substantially rectan lar in cross section throughout, two opposite sides of the bore being parallel andthe other two sides being longitudinally convergent, the line of division between the segments being in a plane substantially at right angles to the In this form of anchor the interior bore is substantially wedge-shaped in one direction so that the bolt in entering it would tend to force the segments apart with a wedge-like action, while in the other direction, 71. 6., the direction in which the anchor is not divided into segments and hence in which any wedge-like action would be undesirable,-the walls substantially conform to the bolt. The result of the foregoing is a tendency to reduce the mutilation of the anchor as the bolt is being forcedin:

'W9.Id, a tendency to increase the size and strength of the threads formed by the screw, and a general increase of the efliclencyof the anchor both in its grip upon'the walls of the hole in which it IS employed, and its gri upon the bolt engaging it Iii order that my invention may be thoroughly understood, I will now proceed pecification of Letters Patent.

I Application filed December 30, 1909. Serial No. 535,698.

. BOLT-ANCHOR.

Patented Aug. 2, 1910.

ings illustrating the same, and will then point out the novel features in claims.

In the drawings: Figure l is a view in" central longitudinal section through a bolt anchor constructedin accordance with my invention. Fig. 2 is a view in central vertical longitudinal section therethrough, at

right angles to the plane of section 'of Fig. 1.

Fig. 3 is an end view of the anchor looking in the direction of the arrow of Fig. 1. Fig. 4 is an end view of the same lookingin the direction of the arrow of Fig. 2. Fig. 5 is a view in central longitudinal sectionthrough a form of bolt anchor in which the the plane of the line 66 of Fig.

.70 segments are entirely separated. Fig. 6 is a transverse sectional view of the same upon 'Referring first to the construction shown in Figs. 1 to 5%,the bolt anchor comprises a substantially cylindrical shell composed of two segments 10-11 divided longitudinally by slots 12. The slots 12 terminate near the outer end of the bolt anchor in substantially heart-shaped recesses 13, as shown. The segas in the example of my invention shown in Figs. Sand 6. The shell is provided with a longitudinal bore 14 which is substantially rectangular at any point in. transverse sec tion throughout the device. Two of the o posite sides 15 of this bore are substantial y parallel with each other and with the axis of the bore, while theother two sides16 are inwardly conver ent front the outer to the inner end, 2 0., rom the end shown in Fig. 3 to the end shown in Fig. 4. The parallel sides 15 are those sides which are at right anglesto the lineof division between the segments, 2'. 6., the slots 12 in the first four 'fig'fi'fesu In Figs. 5 and 6 I have shown another 8O ments in these figures are shown as united vided as in any event the forward end of the anchor is not expanded and the flexibility to dqscribe certain embodiments thereof,

permitfthe inner'ends of the segments to exor malleability of the metal' will readily I pand even though the outer ends be actually united as in the example shown in the first four figures. It will be also understood that it is not essential to terminate the slots 12 in the heart-shaped recesses 13, but that the same is possible and advantageous under some circumstances in that it tends to prevent fracture of the segments beyond such points.

What I claim is:

l. A bolt anchor having a longitudinal bore therethrough which is substantially rectangular in cross section at any point, two opposite sides of the said bore being approximately parallel with respect to each other, and the other two sides being longitudinally convergent toward the inner end of the anchor, the said anchor being formed in two segments divided longitudinally in a plane substantially at right angles to the parallel sides of the said bore.

2. A bolt anchor comprising a substantially cylindrical shell composed of two segments having a longitudinal bore therethrough which is substantially rectangular in cross section at any point, two opposite sides of the said bore being approximately parallel with respect to each other, and the other two sides being longitudinally con vergent toward the inner end of the anchor, the plane of segmental division being substantially at right angles to the parallel sides of the said bore.

3. A bolt anchor comprising a substantially cylindrical shell having a longitudinal bore therethrough which is substantially rectangular in cross section at any point, two opposite sides of the said bore being approximately parallel with respect to each other, and the other two sides being longitudinally convergent toward the inner end of the anchor, the said shell being provided with slots extending from the inner end part of the distance to the outer end of the shell, the said slots dividing the shell into two segments substantially upon a plane at right angles to the parallel sides of thebore.

4. The combination with a bolt anchor having a longitudinal bore therethrough 'which is substantially rectangular in cross said bore.

In witness whereof, I have hereunto set my hand this 27th day of December, 1909. TRAUGOTT F. KELLER. Witnesses t l ln'Nnr EURING, John G. GLYNN.

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