US1702920A - Expansion shield - Google Patents

Description

Feb. 19, 1929.

C. C. TOMKINSON EXPANSION SHIELD Filed Aug. 25. $921 2 Sheets-Sheet v gave/Aim, 2/17/65 C YUM/525022 Feb. 19, 1929. 1,702,920

C. C. TOMKINSON v EXPANSION SHIELD Filed Aug. 25, 1921 2 Sheets-Sheet 2 (invents:

C'fiazzv fjamirz'nsan $513 Gum/mu,

Patented Feb. 19, 1929.

UNITED STATES v 1,702,920 PATENT OFFICE.

CHARLES C. TOMKINSON, OF PLAINFIELD, JERSEY, ASSIGNOR TO JOHN EDWARD OGDEN, OF MOUNTAINVILLE, NEW YORK.

EXPANSION SHIELD.

Application fil'ed August 25, 1921. Serial No. 495,315.

This invention relates to expansionshields for bolt anchors such-as are used in walls of brick, stone or cementitious material.

Expansion shields used in bolt anchors in which the shield is expanded by a nut car ried by a bolt that bears directlyagainst the bottom of the shield are termed bottombearing shields. Tests of shields of this type have established the fact that the success of the shield is largely dependent upon the strength of the bottom to resist the pressure of the bolt. When shields of this type are formed from sheet metal the thinness andductility of the metal makes it necessary to reinforce the bottom in some manner to Withstand this thrust of the bolt.

This invention has for its object to provide means "for reinforcing the bottom or end of anexpansion shield.

tion proceeds.

Several. different forms of expansion shields having means for attaining the objects of the invention have been illustrated in the drawings and for convenience the different forms'may be roughly grouped as follows. I

The first group shown in Figs. 1 6 inclusive, comprises shields having a plurality of separate sections held together by suitable means such as a split ring, each section having its inner end or bottom reinforced as by folding or .corrugating the end or by'a separate reinforcing member- The second group, shown in Figs. 7 -21 inclusive, comprises shields having a plurality of sections held together if. desired by a split ring and joined at their inner ends by a slack connection which allows the sections'to expand freely at first but forms a bridge to sustain the bolt thrust after the slack has been taken up. i

The third group, shown in Figs. 22452 in elusive, comprises a shield made from asingle piece sheet metal blank with aconnecting bridge'bet-ween 'the expansion elements located at the inner end of the shield to take the thrust of the bolt. I Another form that Still another form falling in'this group com-,

prises sectional shields having their bottoms welded together.

inner.

, Further objects will appear as the descrip- If desired a thrust washermay becombined with any of the three groups described as shown, for instance, in Figs. 5 and 6. 1

Referring nowspecifically to the figures of the drawings.

Fig. 1 1s a sectional elevation of one seetion of a shield constructed inaccordance with the invention.

Fig. 2 is anelevation of the structure 1 shown in Fig. 1, taken at right angles thereto.

Fig. 3 is an end elevation of the shield comprising sections constructed as shown in- Figs. 1 and 2. v Figs. 4, 5 and 6 show another form of} the lnvention in which a separate thrust washer or disc is used to form athrust bearing.

Fig. ,7 is an elevation of another form of bolt anchor in which theshield is formed from a plurality of sections held together. at

the construction in which the sections are,

loosely connected by a cupped'member.

3 Figs. 12 and 13 are corresponding views of another form of the invention in which the ends are bent outwardly and laterally and re eeive a disc or washer.

Figs. 14 and 15 are corresponding views of another form of the invention in which the disc is disposed within instead of without the shield.

Figs. 16 and 17 are corresponding views of V another form of theinvention in which each section has a member projecting from its end and extending into a slot formed in another section. 1'.

Figs. 18and 19 are corresponding views of another form of the invention in which the ends of the sections overlapand are joined by a slack connection. Figs. 20 and 21 are corresponding views of another form of the invention having outwardly projectingportions joined by a slack connection. 7 p 22isan elevation of another form of "bolt anchor embodyingjmy invention and comprising a plurality of sections having their inner or bottom ends tightly connected I together and reinforced as by folding. In this form oi? the invention the shield is made from a single piece sheet metal blank.

Fig. 23 is a sectional elevation of the shield. shown in- Fig.

Fig. 24 is an end elevation of the construction shown in Fig.

25 is an elevation of one of the sections ot' the shield shown in Fig. 22.

Fig. 26 is aplan view of the blank -from which the shield shown in Figs. 22, 28, 2d and 25 is constructed.

Fig. 27 is a sectional elevation of another form or shield constructed in accordance with my invention and comprising-a plurality of sections having outwardly projecting overlapping portions.

Fig. 28 is an end shown in Fig. 27. c

Fig. 29 is a sectional elevation of another form of shield comprising a plurality of sections having connected outwardly projecting view of the construction I portions.

Fig. 30 is a new end view of the construction shown in Fig. 29.

Figs. 31 and 32 are sectional elevations of two different tormsot reinforcing discs that may be used in connection with the shields shown in the preceding figures.

In the form of the invention illustrated in Figs. 1 2' and 3 each sect-ion 53 has its inner end folded back upon itself in the term of a letter S" as shown particularly in Fig. 6. These folded over portions materially strengthen the bottom of the shield.

In the form of shield shown in Figs. Ah 5 and 6 the ends of the sections are bent inwardl'y toward the axis of the shield and a disc or washer 58 positioned in the bottom of the shield".

The form of the invention shown in Fig. 7 falls within. the second group in which the sections of the shield are held at one end by a split ring 5 L but the opposite or inner ends of the sections are permitted to move laterally a limited distance upon the initial expansion of the shield. The details of this slack connection are shown in Figs. 8 and 9' wherein each section is SllOWH as"provided with a slot 60'. A brid emember or strip 61 is positioned within the bottom of the shield and has its ends extending through the slots and bent backwardly as shown at 62. When the nut used in connection with this shield begins to travel along the bolt 50 the initial movement of the nut will cause the inner ends of the sections to move outwardly until the slack between the ends of the members 6 1 and the shield sections is taken up. Thereafter the bridge member 61 forms a firm andrigid abutment tor the bolt.

In Figs. 10 and 11 another slack connection between the shield sections is shown and in this form the inner ends of the sections are turned inwardly as shown at 63, and a cup shaped member 64 encircles these end portions. The member 64 is indented as shown at 65- to strengthen the member and by this construction also a firm abutment tor the bolt i-sformecl. 1

' In Figs. 1-2 andl3 the ends 66 oi the shield sections are bent laterally outwardly and are then. bent away from the axis each end forming a U-shaped section. A washer 67 is placed over the laterally bent portions and is retained in place by the ends 68 of the sections.

The form ol shield shown in i l and 15 is simi-la-r'to that shown in Figs. 12 and 13 but diii ers in that the ends 69 ot' the shield are bent inwardly instead of outwardly.

In Figs. 16 and 17 each section of the shield is formed with an extension 70 the end of which is passed through a slot 71 in the adjacent section." The extreme ends of these portions 70 are bent back against the bottom ofthe shield.

In Figs. 18 and 19 the ends of the two sec 7 tions of theshi'eld overlap and one of them has formedtherein a slot 2 through which is passed an extension 73 formed on the other see lion.

In Figs. 20 and 21 one section is provided with an outwardly bent end portion 74 which is encircled by an overlappingportion 78 formed on the other section, these portions being loosely connected to provide slack and to be taken up upon the initial expansion.

In Figs. 22 to 26 inclusive a one piece sheet metal expansion shield is illustrated, the blank being shown in Fig. 26. In order to form this shield the end portions 80' are folded about the central portion 81 and the central portion is folded on the dotted lines thereby forming the overlapping ends shown 21582 in Figs. 24 and 25. This construction is somewhat similar to that shown in Figs. 1, 2 and 3 but in the present instance the shield is formed from a single piece blank; The completed sh eld formed lirom this blank 1s shown. in Frg. 22;

27' and-28 illustrate a shield somewhat similar to that shown in Figs. 20and 21 and in this instance the overlapping ends 85 formedf'on. one section of the shield tightly enclose the outwardly projecting portion 86 formed on the other section. v

In the shield shown in Figs. 29 and 30 each section has an outwardly extending portion 87, these portions. being encircled. by a band 88. The ends of the portions 87 are flared outwardly as shown at 89 to retainthe band in place.

Fig. 31 shows a cup shaped reinforcing member which may be used in conjunction with any of the shields shown in the preceding'figures in a manner simllar to the Washer. 08 shown 1n Figs. 5 and 6.

Another form of reinforcing member; is

shown in Fig. 32, this member being cup shaped and having an indented central portion further strengthening the thrust member.

Although several specific embodiments of the invention have been illustrated and described, it will be understood that the invention is capable of further modification and that further changes in the construction and in the arrangement of the various elements may be made without departing from the spirit. or scope of the invention as expressed in the following claims.

- lVhat I claim is: V

1. An expansion shield comprising a plurality of sections, the inner ends of the sections being slotted and reinforcing means extending through the slots. 7

2. An expansion'shield comprising a plurality of sections, the inner ends of the sections being sloted and reinforcing means within the shield extending through the slots.

3. An expansion shield comprising a plurality of sections, the inner ends of the sec-' tions being slotted and reinforcing means having ends extending into the shield through the slots.

l. An expansion shield comprising a plurality of sections, the inner endof one of the sections being slotted and reinforcing means extending through the slot.

5. An expansion shield having a. plurality of sections, the inner end'of one of the sec tions being slotted and reinforcing means secured to another section and extending through the slot.-

6. A sheet metal expansion shield expansible at its inner end, comprising a .plu ralityof sections laterally expansible into permanent gripping engagement with a wall opening and having its inner endclosed and separate reinforcing means for the closed end of the shield.

7. An expansion shield formed'of sheet metal and expansible at its inner'end',.com-

prising a plurality of longitudinal laterally expansible sections having their inner ends bent to form a closed end for the shield, and

separate means reinforcing said closed end. 8. A. sheet metal expansion shleld expansible atits inner end, comprising'aplurality of sections laterally expansllole into permanent gripp ng engagement with a wall opening and havmg its inner end closed and reinforcing means for the closed end of the shield, sa1d relnforclng means extending across and'bridging the closedend and in uxtapos1t1on thereto.

9. In combination, an expansion shield having walls of uniform thickness, reinforcingmeans disposed across and bridging the inner end of the shield, an expansion mem ber in the shield adapted to travellongitudinallyv therein and expand the shield at its inner end and a threaded bolt engaging said member and adapted to move said member longitudinally in the shield, said bolt being adapted to contact with said reinforced end.

10. In combination, an expansion shield having walls .of uniform thickness and comprising a plurality of sections connected at their inner ends by a reinforcing member, a nut in the shield adapted to travel longitudin ally in said shield and expand the shield and a bolt threaded into said nut and adapted to contact with said reinforcing member. 11. A sheet metal expansion shield having walls of single thickness and comprising a plurality of walls laterally expansible into permanent gripping engagement with a wall opening and reinforcing and expansion limiting means for the inner end of the shield.

12. An expansion shield having walls'of single thickness and substantially uniform in cross sectionthroughout their length,.said

walls being laterally expansible into permawardly bent ends. 1 Y

14. A sheet metal expansion shield comprising a plurality of sections laterally ex-v pa-nsible at the inner ends thereof into per-,

manent gripping engagement with a wall opening, the inner end of each section of the shield being bent inwardly toward the axis thereof, and reinforcing means disposed in the-inner end of the shield and extending across and bridging the inwardly bent inner j ends. I r I In witness whereof, I have hereunto set my hand this 12thday ofAugust,1921.

CHARLES C. TOMKINSON.

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