US1267903A

US1267903A - Bolt-anchor.

Info

Publication number: US1267903A
Application number: US191920A
Authority: US
Inventors: Henry W Pleister
Original assignee: HENRY B NEWHALL
Current assignee: HENRY B NEWHALL
Priority date: 1916-09-20
Filing date: 1917-09-18
Publication date: 1918-05-28
Anticipated expiration: 1935-05-28

Description

` n @Ma 4' H. W. PLEISTER.

BOLT ANCHOR. APPLicATIoN FILED sEPT.18. |917.

\ lli-9.

www #Q27 (W MM@ Patented May 28,1918.

HENRY w. rrinisrna, or wns'iriniin, Naw massi?, assioNon To HENRY B. NEWHALL.

BOLT-ANCHOR.

To all whom t may concern: i

Be it known that I, HENRY W. PLnis'rna, a citizen of the United States, residing at Westfield, in the county ofUnion and"State of New Jersey, have invented certain new and useful Improvements in Bolt-Anchors, of which the following is a. specilication, taken in connection with the accompanying drawings.

This application is a division of my copending application, Ser. No. 121,105, filed Sept. 20, 1916. i

My invention relates to bolt anchorsand more particularly to a bolt anchor which has a great holding capacity and yet one which willnot crack a wall, a partition, a

block of marble, stone or any other material in which it may be desired to use myboltanchor.

The common form of bolt anchors are exn panded by having the expanding member, the screw or bolt, move down an inclined surface which extends approximately from one end to the other, reaching its nearest approach to the axis of the anchor at the end which is farthestA embedded` in` the wall, block or other material. This causes the maximum expansion to be at the very end of the bolt anchor. This makesit inipossi ble to use the ordinary common form of expansion bolt in many locations.

My expansion bolt removes the point of maximum expansion` from the end `of the bolt and insures a gradually lessening grip and wedging action from that point to the end of the bolt.

My present invention relates more particularly to that class of bolt anchors known as anchors, or ductile anchors, or lead anchors, or screw anchors, in which the material of the anchor is some relatively soft metal, such as lead or an alloy, in which the screw cuts its own coperating screwthreads.

My invention further relates to certain details of construction which will be described in the specification and pointed out in the claims.

T have shown in the accompanying drawings several illustrative embodiments of my invention but of course it is to be understood that my invention is not to be confined simply to the forms illustrated. In these drawings the same reference numerals refer to similar parts.

Figure 1 is a longitudinal vertical. section Specicatioiiof 'Letters Patent.

of my bolt anchor shown as a ductile anchor, lead anchor, or screw anchor.

retain-eti iuay es, irais., 1

l Original application led September 20, 1916, Serial No. 121,105. Divided and this application led September Serial No. 191,920. v

Fig. 2 is a vertical section of my anchor mounted in a con'iparatively shallow block of marble, stone or similar material. The work supported is shown in section and the wood screw in side elevation.

Fig. 3 is a longitudinal vertical section of` my anchor tion'. i

Fig. 1- is a longitudinal vertical sectiony of the anchor shown in Fig. 3 showingit expanded and cooperating with the support to hold the work.

Tnfthe illustrative embodiments of my invention lis an anchor having a collar 2 and two tines 3 and iland an axial bore 5 which has a tapered portion 6 which reaches its nearest approach tothe axis of the anchor at 7, and then recedes or flares from that point to-the end 8 of the anchor forming a flaring surface 9. Ordinarily these anchors, or ductile anchors, or lead anchors or screw anchors 1 as they are called in the trade, are used for lighter work The expanding member is usually a woodl screw 10 which cuts its own cooperating screwthreads in the anchor as it is screwed home. `llt is well known that in thin walls, or thin partitions, or thin slabs of stone, mar` provided with a weakening porble, slate or similar material 11, the ordinary form of lead anchor often cannot be used for the reason that the maximum ex.

pansioii would occur at, the

points

12,12

which will cause thexsurface 13 of the slab` of marble, stone, slate, the partition or other -support 11 to become cracked, chippedor niarring or breaking of the slab `of marble,

stone, slate or wall or other support 11 by removing the maximum strain and wedging stresses from the

points

12, 12 to a point rcinovcd from the end 8 of the anchor and far enough away from the surface 13 so as to bring the point of maximum expansion well within the body of the slab of marble, stone, slate or wall or partition 11.

In the operation of my invention, Fig. 2, the hole 14 is formed leaving a comparatively thin portion 15. The ductile anchor 1 is then inserted and the work 16 will' be snugly held to the face 17 of the slab of stone, marble, slate or the partition or other than are lag shields.I

support 11 by means of the wood screw 10 which will cut its own coperating screwvthreads yin the body of the anchor as it is screwed along the axial inclinedbore G, the maximum expansion being exerted substantially at the

points

18, 18, well within the slab of marble, stone, slate or Wall, partition or other support and removed from the thin portion 16. From the

points

18, 18, Fig. 2, to the end 8 lof the anchor the gripping action will gradually 'lessen so that at i the very end 8 ofthe anchor no strains will be'exerted which will cause a fracture, crumi bling, orv marring of the face 13 of the support 1-*1 whatever material it may be formed yof.

To make the action even more delicate viously, described.

When the wood screw 10, eut-ting its threads .in the body of the anchor 19, passes the `point 25 which is the point of minimum diameter of the axial bore 24, the weakened

portions

20, 20 will permit'the end portions 28, 28to move slightly with relation to the other portions of the anchor and tend to vcause the'two sides of the

valleys

29, 29 to move apart or open, Fig. 4, should by any circumstances anyconsiderable strain he exerted upon the portions 28. 28 Awhich might have a tendency tocrack or injure the surface'13. These valleys 29 are preferably formed by casting` them Within the anchor.

In all figures-of thefdrawings the inclined v and fiaringsurfaees, as well as the gripping Copies of this patent may be obtained for action of the anchor, are somewhatexaggerated for purposes of clearer illustration. Itis also apparent that different thieknesses of work 16 can be held by thesame y anchor without the Wood screw 10 binding before it has snugly secured the work to the face 17 of the slab of marble, stone, slate or wall or support 1-1.

Having thus described this invention in connection with illustrative embodiments thereof to the details of which I do not desire to be limited, except as required by the scope of the appended claims, what is claimed as new and what is desired to secure by Letters Patent is set forth in the appended claims.

What I claim as my invention and desire tol secure by Letters Patent is 1. The combination of a ductile anchor provided with an axial bore of minimum diameter between its ends said bore flaring from 'its minimum diameter toward each end, and a screw to directly engage both of said flaring surfaces to cut its own female threads to expand the ductile anchor.

2. The combination of a ductile anchor provided with an axial bore of minimum diameter between its ends, said bore 'il-.wing from its minimum diameter toward each end, said ductile anchor being` provided with one or more weakenng portions and a screw to directly engage both of said flaring surfaces to cut its own female threads to expand the ductile anchor.

3. rFhe combination of a ductile anchor having a collar, tines, and an axial bore having itsminimum diameter between the ends of the anchor and Haring from its mini mum diameter toward each end, and a screw to directly engage both of said flaring surfaces to cut its own `screw threads land ex pand the ductile anchor.

4. The combination in a ductile anchor of a collar, tines, an axial lbore having its minimum diameter 'between the ends of the anchor and flaring from its minimum diameter-towardfeach end, said anchor being provided 'with yone or more weakeningl portions adjacent'tol'ithe minimum diameter of (he axial bore. f

` n HENRY W. PLEISTER. y Witnesses:

MARY R. RYAN,

ELIZABETH J. ROTH.

five 'cents each, by addressing the Commissioner of fPatents, Washington, I).l C.