US1394925A - Expansion-shield - Google Patents

Description

E. W. MARSHALL.

EXPANSION SHIELD.

APPLICATION FILED AUG.15, I919.

. Patented Oct 25 and a resident of which is tures-thereof in appended claims.

tion is to provide a mm! W. umzut. or YONKERB, new YORK,

01 HOUNTAINVILLE, NEW YORK.

OFFICE.

ASSIGNOR r0 .1. Bowman oenzn,

EXPANSION-SHIELD.

To all whbm a Be it known that a citizen of the United States of America, Yonkers Westchester fork, have in- GOMGM I county, and State of New vented certain new and ments in Expansion-Shields, of which the following is a specification, reference being.

liad to-the accompanying drawings, formin a part thereof. his invention relates to expansion shields and its objectis to provide a simple device inexpensive to manufacture and which may .be 'used to form an effective anchorage for bolts or screws in structures of cement, abrick, stone or other material with which the threads of the bolts or screws cannot obtain a good hold.

More specifically, the object of the invendevice of this character which may be made of sheet metal.

In order that my invention may,be thoroughl -understood, I will now proceed to describe the same in the following specification and will then point out the novel fea- Referring to the drawings:

' Flgure '1 is an elevation of a blank of shield made sheet metal with parts thereof cut away to form integral diagonal strips between the ends and edges of the blank.

F i 2 is an elevation .of an expansion shield made by rolling the blank of Fig. 1 into a tube.

Fig. 3 is asectional of. a wall or other structure having a hole therein in which is inserted an expansion shield like that'shown in Fig. 2. In this figure a nut is shown in section and a bolt in elevation. g

4 is an elevation of a blank of sheet meta with a part thereof corrugated and another part perforated to form oppositely inclined diagonal strips.

Fig. 5 is an elevation of an expansion by rolling the blank of Fig.4 into atube.

Fig. 6 is a sectional pansion shield like that shown in Fig. 5 in a hole drilled in a part of a wall.

Figs. 7 and 8 are portions of blanks having other forms of perforations which may be used either in tubes or sheets, to form shields which also embody this invention.

elevation of an ex- Specification of Letters Patent. Application filed August 15, 1919. BeriaI'No. 817,728.

, ERNEST W. MARSHALL,

useful Improve form and this will cause the strips to the shank of the bol elevation of a part 1s shown corrugated nected at their Patented Oct.

Fig. 9 is a perforated blank which may bedpressed or drawn into a tubular shield an Fig. 10 is an elevation of a shield formed from the blank shown in Fig. 9'.

ike characters of referencg designate correspondlng parts in all the fi res.

1O desi nates a rectangular lank of sheet metal. 11 Figs. 1, 2 forations are punched through this blank intermediate its ends and ed es to form agonal ribs 11 connecting t e ends and This 'blank'is shown in designates a structure in hole for this shown pushed ahead of the shield 12. After as been done a bolt 22 which is drilled a clearance shield. In Fig. 3 a nut 21 is into this hole, this h through theshield into' the nut.

It is-obvious that the nut may be drawn toward the [head of a latter and that this will draw the strips 11 together, thus closing the spaces between them. This will cause an increase of the circumference and consequently of the diameter of the part of the shield which'the strips be'disand outwardly against t and against the wall of the hole, and thus form a secure anchorage. It is to be noted that, this expansion willnnot take place along longitudinal lines but will be distributed circumferentially thus gripping all partsof the circumference of the bolt and of the wall of the hole.

In Fig. .4 the lower part of the blank 10' at 13 for the purpose and forming screw threads when the blank is rolled into a tube 14 as shown in Fig. 5. Between this corrugated part of the blankand its upper end are angular perforations 15 so disposed as to leave a plurality of diagonal strips 16 inclined in one direction to the edges of the blank and to the axisof the tube 14, and a plurality of other diagonal strips 17 inclined in another direction but at a greater angle to the edges of the block and to the axis of the tube. These strips when formed as thus described, are intercom points of crossing.

. Fig.- 6 shows an expansion shield of this form inserted and expanded in a hole in the tortedboth inwardly and 3 slot-like per- Figs. 2 and bolt by turning the with a washer or other device 23 under its head, is put article held thereby against the side of the wall 20. The threads of the lag screw engage the threads formed by the corrugatlons which would otherwise be closed, cut off. Drawing the metal will change the shape of the perforations so that they will appear as they do in Fig. 10. Of course other shapes '13 and when the screw is turned this end of of perforations may be used. The lower end the shield is moved thereby toward the head of the bolt. This causes an increase of circumference and diameter of the part of the shield formed of the strips which results in the strips buckling or collapsing and forming an anchorage. 4 Because of thefact that the ribs which run in one directlon are at a greater angle of inclination than those which run in the other direction, this expansion will be distributed circumferentially in order to form a perfect anchorage by gripping all parts of the circumference of the lag screw and of the wall of the hole.

- The intermediate part of the blank may be formed as shown in Fig. 7 with angular perforatiors 30, and 31 oppositely disposed or as shown in Fig. 8 with angular perforations 32.

In both of these cases the rows of perforations are. inclined to the vertical edges of the blank. In the latter case the perforations 32 increase in size toward the lower end of the blank which forms the inner end of the finished shield which 'will result in the first and greatest expansion taking place at the inner end of the shield when it is shortened by longitudinal pressure.

It is obvious that a great variety of forms of perforations may be used, a few of which have been shown, and that these perforations may be either formed in a tube or in a flat sheet which may be rolled into a tube as described.

This invention is, I believe, capable of being carried out in many different forms, some of which have been illustrated and described for the purpose of showing structures which embody the invention, but I do not intend to limit myself to these specific forms of construction as it is well within the scope of the invention to manufacture expansion shields which embody this inwhich perforations 41 which in the blank are longer circumferentially than they are radially. These perforations may be disposed on curved lines such as A-B. This blank may be drawn into a seamless tube as shown at 42 In Fig. 10 with the upper end thereof,

ofthe tube is shown with helical corrugav tions rolled in it as at 43 to provide screw threads for the reception of a screw or bolt.

What I claim is:

1. An ex ansion shield comprising a tubular member having between its ends a plurality of spaced straight parallel strips 1nclined to theraxis of the tube. 2. An ex ansion shield comprising a tubular mem er having between its ends a plurality of oppositely inclined spaced diagonal strips. F r

3. An ex ansion shield comprising a tubular member having between its .ends a plurality of oppositely inclined spaced interconnected diagonal strips. p

4. An expansion shield comprising a tubular member having between its ends a plurality of oppositely inclined spaced interconnected diagonal strips, the strips which are inclined in one direction 1 being at a greater angle to the axis of the tube than those which are inclined in the opposite direction.

5.'An ex ansion shield com rising a tubular mem er, said member eing corrugated near one of its ends to receive the threads of a bolt, said'member bein cut away at spaced intervals between the t read rece1ving means and its other end toform. a

plurality of strips inclined to the axis of the 6. An expansion shield comprising a tubular member, means near one end of said member for receiving the threads of 'a bolt, said member being cut away at spaced intervals between the thread receiving means and its other end to form aplurality of oppositely inclined diagonal'strips.

An expansion shield comprising a tubular member, means near one end of said member for receiving the threads of a bolt, said member being cut away at spaced intervals between the thread receiving means and its other end to form a plurality of oppositely inclined interconnected diagonal strips. I 8. An expansion shield comprising a tubular member, means near one end of said member for receiving the threads of a bolt, said member beingl cut away at spaced intervals between the t read receiving means and its other end to form a plurality of oppositely inclined interconnected diagonal strips, the strips which are inclined in one direction bein at a greater angle to the axis of the tu e than those which are inclined in the opposite direction.

9. An expansion shield constructed of a h t metal blank perforated to form in the finished shield a plurality of oppositely inclined interconnected diagonal st ips, said perforated blank being formed in a tube,

. tube than those which are inclined in the the strips which are inclined in one direction being at a greater angle to the axis of the opposite direction.

10. An expansion shield constructed of asheet'metal blank corrugated near one end to form means for receiving the threads of a bolt, and perforated between said corrugated part and its other end to make a plurality of diagonal strips, said blank being rolled transversely into a tube.

11. An expansion shield constructed of a sheet metal blank corrugated near one end to form screw threads, and perforated between said corrugated part and its other end to make a plurality of oppositely inclined interconnected diagonal strips, said blank being rolledtransversely into a tube.

12. An expansion shield madeof a sheet metal blank with a part thereof intermediate its ends comprising portions separated by diagonally disposed perforations, said blank being formed into a tube, said separated portions lying in parallel-helical lines in the tube and being adapted to be movedtogether to decrease the size of said perforations when the ends of the tube are forced toward each other.

' 13.. An expansion shield comprising a tubular membercut away at spaced intervals to provide. a plurality of reversely inclined strips. Y

14. An expansion shield comprising a tubular member-of sheet metal having rows of perforations therein providing parallel helical strips of metal separated by the perforations, said member being adapted to be compressed longitudinally to bring the strips toward abutting engagement with each other and to expand the strips laterally, inwardly and outwardly.

An expansion shield comprising a tubular member of sheet metal having rows of perforations therein increasing in size toward the inner end of the shield, providing strips of metal separated by the perforations, said member being adapted to be compressed. longitudinally to bring the strips ERNEST W; MARSHALL.

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