US1435434A - Expansion bolt - Google Patents

Description

^ H. F. v'oELKER.

' EXPANSIDN BOLT. Y APPLICATIQN FILED .FEB. vB, |922.

1,435,434, Pmtemv, 14,1922.

We@ l (Il Htl Patented Nov. 14, 1922.

Abpiieatibn filed February-a, 1,922. serial,itytaise.

Yorklymin the county' of New Castle 'andj State of Delaware, have invented certain new and useful Improvements injEXpan'sion Bolts, cation. i,

The invention relates to expansion' bolts, 'and has as anobject the provision'of such'a device which may be placed in a perforation in a structure with readiness, and which may be expanded to effectively grasp the walls of the perforation. 4

A furtherobject of the invention is the provision of a casing which may be placed about an eXp-ansion bolt to enable the same to be more readily placed.

An illustrative embodiment of the inven-y tion is shown in the accompanying drawings, in which f Fig. v1 is a central longitudinal section, partsbeing shown in elevation.

Fig. 2 is a perspective view, partly broken away, of the-casing.

Fig. 3 1s a plan view ofa blank from l which the casing may be produced, and

. the bottom 11 may be laid from the interior;

Fig. 1 is a perspective view on a reduced scale and partly broken away of a portion of wall with `the casing expanded therein. A diinculty with the application of expansion bolts heretofore has been that the different parts fall out of their relation to. each other while being placed inthe-opening if the opening chances to have irregular Walls.

The present invention provides forv aremoval of this diiiiculty `by the provision of l a casing 10, which is shown as comprising a sheet of material bent into cylindrical form. and provided with a bottom 11. To hold the sheet of material in its position in cylindrical formone `edge of the blank 12 from which it is produced is provided with tongues 13, and the opposite edge of the blank is provided with slots 14, into which the tongues may in Fig. 2.

VTo retainy the bottom 11 of the cylinder one edge of the blank 12 may be crimped to form a flange, as'shown at 15, against which The expansion device is shown as comprising a plurality of members 16 which, when assembled, produce a complete cylinder, and which are provided with prominent of which the yfollowing kis a speci-j be introduced, as clearly shown' are adapted to bite *intothe walls ofthe opening when the rmeinberis'expanded.y @To f.

expand the device '16 the'` interiorthereof is threaded-'but isl formed upon the'- surface of `ridges17upon"tl'ieir eXter-iorjwhich ridges .f 'y

a' cone tapering toward its inner end. When well' .knowni manner." l

the). screw threaded bolt'18sscrewedjintof l I lthe expansionf'device thefme'mber's ,16"'will" `forcibly spread, as shown in "Fig.f 4,` in a `To retain. ktheassembled expansiony mem-ff vbers in the casing' during shipment ain'd'h'an-y dling the edge of thel casing iscrim'ped and u bent into a flange 19 int-hesame manner as the flange 15 already described is formed; i The flange 19 yis formed after `theassembled members areintroduced 'into the casin and ensures that the'expanslonydevlcegwlll re-y` `mainin`1tspos1t1on` ready for use when 1n shipping or storing operation. y The con truction of the casing 10 issu that may' be*y readily ruptured by the expansion of the expansion device, allowing y the ridges 17 vto either piercey its vwalls or casing outward into the walls `of the per-v. 1 y

foration in which the bolt is placed. `1

The casinglO'may be formed of any suit` f able material', a light gauge tin beingat present preferred. Whenthe portions' 16 of the expansion device are assembled within the casing 10 they aresecurely held in such a position thatthey may be handled asv an entity and may ?be readily introduced into .l

the perforation-where it is desired tosecure the bolt 10, without losing their relation` to eac-h other.

The 'devicevis-capable1of` being used in: 95

many positions `which, have beenj impossible with devices of the lprior art. `It is even possible .to wire them in place upon forms into n which concrete has to stillwet. To provide for entry` of thejgcrew withthe threads a portion 2O of the eXpansion device is made without threads and cyl-.` v1 f indrical of a size sufficient to permit of ready entry ofthebolt 1 8.

'If necessary. the device ymay beV removed i after expansion within an opening since theU flexibility of thel shield will permit of its f i squeezing together andy pullingv out 'of the opening when the` vbolt 18 has been "un-y screwed, so,v that nearly enough threads are so indent them so as to carry the walls of the.. y

in engagement to give a hold upon the eX- pansion device to pull it with its shield out of the hole. l

The complete enclosure of the expansion device in the shield prevents any material,

such as sand or broken stone, gettingaccess.

to its interior, and thereby-interfering with the ready placing of the device. I

Minor changes may be made in the physical embodiment of the invention Without departing from its spirit. Y

WVliat l claim as new and desire to'secure vby Letters Patent is: v

-1. In lan expansion bolt, in combination, a plurality of readily separable members having yprotuberances Aupon their outer surfaces, Va vreaflgily rupturable and deformable easing adapted to hold said members in assembled position, anchoring means adapted .to be :Eo-need bet-Ween said members to spread the salme whereby to force said prot-uberans into Contact with the Walls of an opening in which it i5 desired to secu-re said anchoring means with deformation of the Walls of thecasing.

2. An expansion bolt, comprising, in combination, a. plurality of separable members having a tapered threaded opening formed .therebetween when in assembled position, a bolt adapted to be screwed into said opening to spread the members, protuberances upon the outer surfaces of said members, a casino* 'of material adapted to be deformed by said protuberanceg when said members are expanded and having the edges of the blank from Whichpit is formed vloosely .secured together enclosing said members, a bottoni in said casing, a flange upon the mouth of said casing overlapping said members to prevent their removal therefrom.

HARRY r. voniinne

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