US685821A - Expansion-shield. - Google Patents

Description

No. 685,321. Patented. Nov. 5, I901. J. H. 600K.

, EXPANSION SHIELD.

Appiication filed Mar. 14, 1901.

(Ho Madel.)

U ITE STATES" PATENT ()FFICE.

JOHN H. coon, OF NEW-YORK, N. in, AssIcN'o-R'To HENRY-n. NEwn LL,

' or PLAINFI'ELD', NEW JERSEY.

Exenuslo'N-smsro.

srnorrrcerron forming part of Letters Patent N 685,821 dated. rial-at... 5, 1901. Application filed March 14, 1901. Serial n6. 61,091. (No model.)

:To all whom it may concern:

Be it known that I, J OHN H. 000K, a citi- -zen of the United States, residing in the city "of New York, borough of Brooklyn, county of '5 Kings, State of New York, have invented certain new and useful Improvements in Expansion-Shields, of which the following is a specification, reference being had to the drawings accoipipanying and forming part of the same. M3. present invention relates to expansionshields by which a threaded bolt is adapted to be secured to marble, slate t-iling, or other fragile material by'being forced into such an expansion-shield fitted in a holein such ma terial.

In the accompanying drawings, in which like reference-letters refer to same parts throughout the several views, Figure 1 is an axial section through my shield, taken on the no line 1 1 of Fig. 2. Fig. 2 is an end elevation of my shield looking at the 'head of the shield.

Fig. '3 is an elevation looking at the other endv of the shield, the shield in these figures being in itsexpand'ed position. Fig. 4; is an axial section of my shield when in a closed position. Fig.5 is an end elevation of the same, and Fig. 6 is a perspective view show:

ing the shield in its expanded-position.

. My expansion-shield is, formed of expansio his material, such as soft metal, so that the various parts of the same can yield and accommodate themselves to anycavity into which the shield may be inserted. The shield consists of a tubular head A at one end, which is connected with four longitudinally-extending sections 'or members B. The shield is formed in the, expanded position shown in Figs. 1 to 3, and the head' of the shield and members B have an exterior conical surface,

4c the diameter of the head being considerably less than the diameter of the members B at f the other end of the shield when such shield is expanded. The head is formed with a conical central bore F, which communicates with 4.5 a cylindrical bore extending axially through the rest of, the shield, there being grooves D formed on the interior of the members B. These grooves are intended to form the seat for the screw-bolt which is to be inserted-into 5b the expansion shield,.and in order that such bolt may be more readily inserted and grip the shield more firmly a screw-thread E is.

cut on the interior surface of the members 15 throughout the length of the same. As is clearly seen in Fig.3, the sections or members B are separated from each other by longitudinal slots 0, extending up to the head A. Since these slots are of considerable width, the sections B are quite narrow where they engage the bolt on the inside of the shield. The exterior of the shield isformed with suitable projections G to assist the shield in gripping the material into which it is inserted.

After the shield has been formed, as above described, in any suitable way the sections 13 are bent inward, so as to come practically in contact at the outer ends of the same, so

that the shield will take the position shown:

in Figs. t and 5 and. so that it will have a substantially cylindrical form for more readyinsertion into a cylindrical hole. As is seen-in Fig. 4, the central cavity through the shield 'is'tapering under these conditions, and the outer end of the same adjacent to the head Ais of thesame diameter as in the expanded shield, as shown in Fig. 1; It will be noted also that the radial thickness of the members B variesfrom end to end of' the same, such members being considerably thicker at their free ends than they are adjacent the head A.

The operation of ,my shield is as follows: A substantially cylindrical hole is formed in any ma terialsuch as brick, tiling,or Woodto which it is desired to secure a screw-bolt,

and the shield while in the contracted position shown in Fig. 4: is inserted into said hole,

the head of'the shield A being outward. A 1

screw'bolt is then readily inserted int-0 the conical cavity in the head of' the shield and readily engages the threads out on the inside of the membersB. The screw is driven home as far as desirable into the shield and forces its way gradually alongthe tapering bore between the members B, keeping in engagement with the interior threads out upon the same and at the same timeforces such members radially outward. Since the screw en gages the members 13 upon the comparatively narrow inner edges of the same, the forcewith which the members are driven outradially is much less than would be the "case if the screw were imengagem ex t-with such members of the-same than at threaded bore in alinement with the conical hole in the head, such shield havinga'ronghened conical exterior surface so that the ri dial thickness of the shield is less at the head the other end, whereby the slotted body of the shield is arranged to be contracted to a substantially cylindrical form.

9. In an expansionshield formed of expansible material, a tubular head formed with a conical hole, a longitudinally-slotted body attached to the same formed with a roughened conical exterior surface and a threaded cylindrical inner herein alinement with the con-.-

ical hole in the head, the slots in the body of the shield forining ribs whichare adapted to engage a screw inserted into the boreof'the shield throughout only a portion of the periphery of the same whereby the shield is arranged to be expanded with'a gentle radial pressure gradually increasing away from said tubular head bya screw engaging the threads upon the bore of the shield 10. In an expansion-shield consisting of a tubular block ing a cavity formed th'erein,said block being threaded-throughout the length or such cavityto receive a bolt inserted in 'said cavity of soft expansihle material hav g and being formed to engage said bolt through only a small portion of the periphery of the same so as to yieldingly force the expansible material outward. r

11. In an expansion-shield consisting of a block of soft expansihle material having a tubular head, a plurality of sections connected therewith, and separated from each other by longitudinal slots and provided with interior,

projections formed by the intersection of the slots,

engaged hya screw.

JOHN H. COOK:

Witnesses:

HARRY L. DUNCAN, JOHN' N. MOORE.

said sections being threaded internally throughout their entire extent to be readily

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