US2794336A

US2794336A - Lag screw anchoring insert for a concrete slab

Info

Publication number: US2794336A
Application number: US363964A
Authority: US
Inventors: Harry G Ballou
Original assignee: Superior Concrete Accessories Inc
Current assignee: Superior Concrete Accessories Inc
Priority date: 1953-06-25
Filing date: 1953-06-25
Publication date: 1957-06-04
Anticipated expiration: 1974-06-04

Description

LAG SCREW ANCHORING INSERT FOR A CONCRETE SLAB Filed June 25, 1953 H. G. BALLOU 2 sliee'ts sheet 1 June 4, 1957 7/./////////////..,, m w W l 7 E i .K/ i m V r v L M. a w \iv 4 f 1W w E w w E m .mw.

LAG SCREW ANCHORING INSERT FOR A CONCRETE SLAB Filed June 25, 1953 H. G. BALLOU June 4, 957

2 Sheets-Sheet 2 .LAG SCREW ANCHGREPQGrWSERT-FQR A CONCRETE SLAB Harry 'GfiBallou, SanLeandro; C-a'lifi, wsignor to'Snperior Concrete Accessoriesglnu; Chicago,:ll., a corporation of Illinois Application Juneiaf;1 253, Serial No. 363364 7: Claims. owe-10s The :tpresent invention relates gene'rallyto wire'formed inserts for concrete slabs. More particularly the inven- *tion-frelates to that type of insert which isa'da'pted to'be embeddeddn "one corner portion o'f'a tilt-up variety concrete :wall slab during *formation of'the latter andserves with similar inserts in the other corner portions of the aslabrand'afterzhardening of the concrete 'as amedium :whereby the-slab may be detachably connected to a crane .:or:-like hoisting mechanism to .the-end that it maybe first raised'whilein a horizontal position and then tilted into a I verticalposition :next to a concrete floor I slab in connection with the construction of a'building.

One objectcof theinvention is to provide'a wire formed 'insert'which is an-improvement upon and has certain inherent-advantages over, previously designed inserts of the; same general typenandv is characterized by extremely rhi-ghefiiciency. and strengthtand a novel arrangement of :parts.

Another objectaof'the invention is'to provide ia-wire termed-insert which comprises'as its principal components: -(l) a pair-of spaced apartnut-likes helixes which :are sa'dapted to-be positioned 'ldiIECtlY inwards of, and to extendiat right angles'to, one 'ofthe sidetsurfaces. of the ;s1ab-with which the?insert is associated, :and'are designed *torreceive-the shanks ofaipair of lag screws; (2) a'pair of :side- 'byside 'U-shapedlegs whichextend between, and serve to space -apart,=-1the"helixes "and have the .outerends :oftheir side -parts-weldedpto the'inneror opposed-portions-of the helixes; and (3') two.:pairs of L -shaped legs which: are {associated with, and are "disposedroutwards of, ithe helixes; respectively, :andrhave the outer-ends :of corftain f parts thereof welded to the "outer portions -of the helixes and-their othemparts disposed-in parallel 'relation with -the intermediatepartsofthezU- shaped legs.

Another object --of the invention is to provide a' Wire formed insert of the last -men'tioned character in i which said other parts-of the L-shaped =legs-are provided with AL-shaped feet whichgin -connecjtion with formation-of the wa-ll-slab.-.with?which the insertis associated; serve'to space said otherfparts of 'the L-shaped legs and the intermediate -parts-f the :U-shapefdlegsinwards from the-cther-side surface-of the: slab.

-Afl1fth6f= object- 'of theeinve'ntion is-to,;provide :a'wire -.formedinsert of the type and character-under consideration: in which -the innerendsof said oth'er parts of the Lvshaped legs and'the endsi'of the-intermediate parts of the U'-shaped' legs have applied' to them straight rigid'cross .wireswhich extend at right angles to the intermediate vparts of'theU-shapedlegs andserve materially to enlarge the ;.-shear: cone of the-slab corner portion in which the insert-as awhole is embedded.

.A-=sti1l.-further object of the invention is to :provide a wire formed insert which is generally of new andimproved construction, .efiectively and efliciently fulfills its intended purpose and,-due :to itsiparticular-construction, is-capable ofv being producedattacomparatively low cost.

- Other objects; of the. invention and the variousadvantages and-characteristics ef.-the;present-wire1 formed insert for concrete slabs will be apparent from a consideration of the following detailed description.

The invention consists in the several novel features which are hereinafter-set forth and are more-particularly defined by claims at the conclusion hereof.

In the drawings which accompany and form apart of this specification or disclosure and in which like numerals of reference denotecorresponding parts throughout the several views: a

Figure l is a perspective-of a wire formed insert em- "bodying the invention;

Figure 2 is a vertical section showing a tilt-up variety concrete wall slab-positioned over aconcrete floor slab and having embedded in its corner portions wire-formed inserts embodying the invention;

Figure -3-is=a similar section showingtheinserts after they 'have'been connected' 'by way of their lag screws to a harness on a crane and also showing by way of dashdash lines and-dash-dot linesthe manner in which the concrete wall slab in which the'inserts areembedded is first raised above the concrete'fioor slab and is then tilted into a vertical position wherein its lower margin abuts against the floor-slab;

Figure 4 is a perspective showing the concrete wall slab after it has been tilted into its vertical position; and

"Figure Sis an-enlarged vertical section on the line 5--5 of Figure 3.

The insert'which-is shown in Figure 1 of the drawings constitutes the preferred form or embodiment of the invention. -It is designated by the reference numeral -and is adapted with-three similar inserts 7, '8 and 9 to be embedded in a tilt-up variety concrete wall slab '10 and'to form with said similar inserts a medium whereby the slab 10 may be detachably'connected to a crane to the end that it may be raised andthen tilted into a vertical position next to a concrete floor slab "11 in connection with the construction of aconcrete building. The floorslab 11 is shown in Figures'Z, '3 and 4 as resting on a fillor'foundation '12 at the site where the building is to be erected. It is contemplated that in connection with fabricationof the building arectangular horizontally extending frame 13 will be placed on-the foundation 12. After the frame is suitably secured or anchored in place concrete in plastic form is poured into the bottom portion of the frame interior in order'to form-thefloor slab. After pouring of the concrete 'for such slab a separator type film or layer of non-adhesive material is applied to the top surface of the concrete. Thereafter the

inserts

6, 7, 8 and 9 are placed over'the corner portions of the poured concrete 7 for the floor slab 11 and'concrete is poured into the upper portion of the frame interior in order to form the wall slab 10. As soon as the last poured concrete hardensor solidifies the Wall slab 10 with'the four inserts embedded in its corner portions is in readiness to be raised and then tilted into a vertical position next to the floor slab 11 as hereinafter described.

The insert 6 is a unitary structure and for the purpose of the following description of it will be considered as embedded in one corner portion of the wall slab it While the'latter is horizontally positioned over the concrete floor slab 11. It isformed of such heavy gauge wire that for practical purposes'it'is rigid. As its principal components the insert 6 comprises a pair of nut-like helixes '14 and 15, a pair-of U-shaped legs -16-between the two he1ixes,a pair of L-shaped legs 17 in associated relation with the helix "l4 anda-pair of L-shaped legs 18 in associated relation with the helix 15. The helixes 14 and '15 are so formed that the convolutions thereof are of the same diameter and abut againstone another. They extend vertically and are arranged so that the upper-ends thereof are-disposed :directly abeneathrthe upper side surfaceof the-wall slab l0, and their lowerends are positioned an appreciable distance above the bottom side surface of such slab. The interior of the helix 14 defines an internal screw thread for receiving the shank of a lag screw 19, and the interior of the helix 15 defines an internal screw thread for receiving the shank of a lag screw 20. It is contemplated that when the wall slab is formed the concrete therefor will be poured into the upper portion of .the interior of the frame 13 until the upper level thereof reaches the upper ends of the

helixes

14 and 15. By discontinuing further pouring of concrete at this point the upperends of the two helixes will be open to the end that the helixes will be able to receive'the shanks of their respective lag screws. The U-shaped legs 16 are arranged in side by side relation but are spaced a small distance apart. They serve to hold the helixes 14 and in fixed spaced apart relation and consist of horizontally extending intermediate parts 21 and vertically extending end parts 22. The intermediate parts 21 of the U-shaped legs 16 are located a small distance above the bottom side surface of the slab 10 and have the ends thereof connected to, and formed integrally with, the lower ends of the vertically extending end parts 22. The upper ends of the end parts 22 fit against, and are welded to, the inner side portions of the two helixes. The U-shaped legs 16 serve not only to hold the

helixes

14 and 15 in spaced apart relation but also to cause the insert 6 as as a whole to become firmly interlocked with the wall slab 113 after hardening of the concrete for the latter. The L-shaped 'legs 17 are located directly outwards of the helix 14 and consist of horizontally extending parts 23 and vertically extending parts 24. The vertically extending parts 24 are formed integrally'with, and extend upwards from, certain ends of the horizontally extending parts 23 and have the upper ends thereof welded to the outer portion of the helixes 14. The horizontally extending parts 23 of the L-shaped legs 17 extend at right angles to one an other and are disposed in the same horizontal plane as the intermediate parts 21 of the U-shaped legs 16. They are straight and extend outwards at angles of 135 with respect to the intermediate parts of the U-shaped legs. The L-shaped legs 18 are like the legs 17 and consist of straight horizontally extending parts 25 and vertically extending parts 26. The upper ends of the vertically extending parts are welded to the outer portion of the helix 15. The horizontally extending parts 25 extend at right angles to one another and lie in the same horizontal plane as the intermediate parts 21 of the U-shaped legs 16 and the horizontally extending parts 23 of the L-shaped legs 17. They are formed integrally with the vertically extending parts 26 and extend at angles of 135 with respect to the intermediate parts 21 of the U-shaped legs 16. The outer central portions of the horizontally extending parts of the L-shaped legs 17 and 18 are provided with depending .l-shaped feet 27. The latter are formed of medium gauge wire and serve, in connection with formation of the wall slab 16, to space the horizontally extending parts of the L-shaped legs and the intermediate parts 21 of the U-shaped legs 16 from the bottom side surface of the slab. The upper ends of the V-shaped feet 27 fit against, and are welded to, the outer central portions of the horizontally extending parts of the L-shaped legs. In addition to the parts heretofore mentioned the insert 6 comprises a pair of straight rigid cross wires 28 and a pair of straight rigid cross wires 29. The cross wires 28 extend at right angles to the U-shaped legs 16 and have the central portions thereof resting on, and welded to, the ends of the intermediate parts 21 of the U-shaped legs. The cross wires 29 are located directly outwards of, and arranged in parallel relation with, the cross wires 23 and have the central portions thereof resting on, and welded to, the inner ends of the horizontally extending parts of the L-shaped legs 17 and 18. The

cross wires

28 and 29 serve materially to enlarge or increase the shear cone of the slab corner portion in which the insert 6 is em bedded. As shown in the drawings and heretofore indi- .4 cated, the insert 6 is embedded in one corner portion of the wall slab 10. After the concerete for the wall slab hardens or solidifies the insert 6 is connectede to an angle bracket 30 by way of the

lag screws

19 and 20. The angle bracket 30 consists of a horizontally extending leg 31 and a vertically extending leg 32. The horizontally extending leg 31 of the angle bracket 30 is adapted to fit flatly against the portion of the upper side surface of the wall slab 10 under which the insert 6 is embedded and has at its ends holes 33 for receiving the shanks of the

lag screws

19 and 20. The vertically extending leg 32 of the angle bracket 30 extends upwards with respect to the horizontally extending leg 31 and has a hole in its central portion. When it is desired to efiect connection of the insert 6 and the angle bracket 30 the angle bracket is positioned over the wall slab 10 and then manipulated so as to bring the holes 33 in the end portions of the horizontally extending leg 31 into registry with the

helixes

14 and 15. Thereafter the

lag screws

19 and 20 are inserted through the holes and are then turned. in the proper direction so as to connect the shanks thereof to the internal screw threads that are defined by the interiors of the helixes. V

The inserts 7, 8 and 9 are the same in size and construction as the insert 6. They are embedded in the other corner portions of the wall slab 10 and are adapted to be connected to angle brackets 34 by lag screws 35. The brackets 33 are the same in design and construction as the angle bracket 30.

The

inserts

6, 7, 8 and 9, as heretofore pointed out, serve as a medium whereby the wall slab 10 may be detachably connected to a crane. The crane is not illustrated in the drawings but embodies a cable supported hook-equipped block 36 from which is suspended a harness 37. The latter (see Figure 4) comprises a rigid horizontally extending harness member 38 and a pair of depending cables 39 at the ends of the member. The harness member 38 is provided with a cable arrangement 40 whereby it is connected to the hook of the cable supported block 36 of the crane. The central portions of the cables 37 extend around depending sheaves 41 on the ends of the harness member 37 and the ends of such cables are provided with eye-bolts 42 where they may be connected to the central'portions of the vertically extending flanges of the aforementioned angle brackets. It is contemplated that after the harness 37 is connected to the angle brackets the wall slab 10 will be raised into the position shown in dash-dash lines in Figure 3. It is also contemplated that after the wall slab is raised it will be tilted into a vertical position wherein the lower margin of the slab will be in abutting relation with the floor slab 11 as shown in dash-dot lines in Figure 3. After the wall slab is placed in its vertical position the harness 37 and the angle brackets are removed and the slab is then held in place by any suitable brace while it is being connected to adjoining wall slabs. When the wall slab is raised by the crane the lag screws are in tension and when the slab is tilted in its vertical position the lag screws are inrshear.

The herein described wire formed insert, due to its particular construction, forms an effective anchor for its lag screws regardless of whether the latter are in tension or shear. It is capable of being subjected to a comparatively heavy load without being pulled from or causing cracking or breakage of the concrete in which it is embedded. By reason of the fact that the insert includes both U-shaped and L-shaped legs the insert as a whole eflectively and efiiciently fulfills its intended purpose.

Whereas the insert has been described as being adapted for embedment in one corner portion of a tilt-up variety wall slab it is to be understood that it is capable of being used in any form or type of concrete slab. It is also to be understood that the invention is not to be restricted to the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having ,thus described .the invention ,what I .claim has new and fdesireio secure byjLetters. Patent-is:

1. As .an article .of ,manufacture, .anlinsert adapted for embedment in a concrete. slab and (to forman, anchor serving to space the, latter. apart, said U.-shaped legcon- 'sisting of ,a straightdntermediate part and. straight end parts extending at right angles .to theintermediate part,

the outer ends of said end.partslbeing positionedv inabut- .ment with, and connectedto, thelinner side portions of the helixes, and two pairs of. L-shaped wirelegs associated with, and disposed outwards of, the helixes, respectively, said L-shaped legs consisting of first'parts in parallel rela- -tion withtheend parts-of'the U-shapedleg'and second parts at right angles-to the-firstparts-andinsubstantially the same plane as the intermediate part of said U-shaped leg, the ;outer. ends ;of ,said: first .parts being z-arranged in abutment with, and .connected=to,,the.outer side portions of the helixes, the second parts of said L-shaped legs' .b'eing 'positioned-abobtuse angleswvith respectrto said intermediate parts of the- U=shapedleg.

2. (As an, article .of..mam1facture,:an insert adapted for =;embedment in a concretelslabsandstoiform amanchorffor apair 'oflag'screws, said insert comprising a pair. ofwire rhelixesdisposed in spaced apartrelation andzadaptedfto have certain ends thereof disposed directly inwards of, and opening onto, one surface of the slab, the interiors of said helixes forming internal screw threads for receiving the shanks of the lag screws, a pair of side by side one piece U-shaped wire legs extending between said helixes and serving to space the latter apart, said U-shaped legs consisting of straight intermediate parts and straight end parts extending at right angles to the intermediate part, the outer ends of said end parts being arranged in direct abutment with, and welded to, the inner side portions of the helixes, and two pairs of L-shaped wire legs associated with, and disposed outwards of, the helixes, respectively, said L-shaped wire legs consisting of straight first parts in parallel relation with the end parts of the U-shaped legs and straight second parts at right angles to the first parts and in substantially the same plane as the intermediate parts of said U-shaped legs, the outer ends of said first parts being arranged in direct abutment wit and welded to, the outer side portions of the helixes, said second parts of the L-shaped legs being positioned at obtuse angles with respect to said intermediate parts of the U-shaped legs.

3. As an article of manufacture, an insert adapted for embedment in a concrete slab and to form an anchor for a pair of lag screws, said insert comprising a pair of wire helixes disposed in spaced apart relation and adapted to have certain ends thereof disposed directly inwards of, and opening onto, one side surface of the slab, the interiors of said helixes forming internal screw threads for receiving the shanks of the lag screws, a one piece U-shaped wire leg extending between said helixes and serving to space the latter apart, said U-shaped wire leg consisting of a straight intermediate part and straight end parts extending at right angles to the intermediate part, the outer ends of said end parts being in abutment with, and welded to, the inner side portions of the helixes, and two pairs of L-shaped wire legs associated with, and disposed outwards of, the helixes, respectively, said L-shaped wire legs consisting of straight first parts in parallel relation with the end parts of the U-shaped leg and straight second parts at right angles to the first parts and in substantially the same plane as the intermediate part of said U-shaped leg, the outer ends of said first parts fitting against, and welded to, the outer side portions .of ,the ,helixes,:said second parts ofthe L-.-shaped,-legs being .positioned, at .obtuse angles :-with rrespect to said -.intermediate part: of the. U-shaped legs and tprovided w-ith ffixed wire -feet extending away from the -helixes and adapted to space. said second parts, as well'as .said intermediate part1 fromv the other side surface of the slab.

4. As-an article of manufacture, an insert adaptedfor embedment in aconcrete slab and to-form an anchor for a pair of lag screws, said insert comprisinga pair of wire helixes disposedin spaced apart relation-and adapted-to haveflcertain ends thereof disposed directly inwardstof, and. opening ,onto, onesurface; of the slab, the; interiors of: said helixes forming internal screw threads 1 for= receiving the .shankslofthe lagscrews, a one;.piece u-shaped ,wire legsextending between-the helixesandservingrto space the latter apart, said U-shapedleg consistingiof-a straight intermediate part and straight -end;parts extend- .ing at.- rightanglesto the intermediate part,-the outer;-ends loft said,end,parts:being arranged in abutment with, and connected to, .the inner side portions of'the helixes,2two

:pairs ofsL-shaped wire legs associated with, :and disposed outwards of, the helixes respectively, said Leshapedglegs consisting of straight first parts in parallel :relation-with theiendparts of the U-shaped leg and straight second partsratrightangles to-the first partsand in substantially the same plane as the. intermediate part of saidU-shaped .lcg the outer ,ends of saidfirstnparts being arr-anged;-in abutment-with, andconnected to, theouter -side, portions oflthe. helixes .and the second parts of the: L-shapedlegs being positioned at obtuse angles 'with respect :tOrSaid 1 intermediate ,part of; the -;U-shaped slog, :and -,cross wires disposed at right angles to said intermediate part of the U-shaped leg and extending across the inner ends of said second parts of the L-shaped legs.

5. As an article of manufacture, an insert adapted for embedment in a concrete slab and to form an anchor for a pair of lag screws, said insert comprising a pair of wire helixes disposed in spaced apart relation and adapted to have certain ends thereof disposed directly inwards of, and opening onto, one surface of the slab, the interiors of said helixes forming internal screw threads for receiving the shanks of the lag screws, a pair of side by side one piece U-shaped wire legs extending between said helixes and serving to space the latter apart, said U shaped legs consisting of straight intermediate parts and straight end parts extending at right angles to the intermediate part, the outer ends of said end parts being arranged in direct abutment with, and welded to, the inner side portions of the helixes, two pairs of L-shaped wire legs associated with, and disposed outwards of, the helixes, respectively, said L-shaped legs consisting of first parts in parallel relation with the end parts of the U-shaped legs and straight second parts at right angles to the first parts and in substantially the same plane as the intermediate parts of said U-shaped legs, the outer ends of said first parts being in direct abutment with, and welded to, the outer side portions of the helixes, said second parts of the L-shaped legs being positioned at obtuse angles with respect to said intermediate parts of the U-shaped legs, and cross wires extending across the ends of the intermediate parts of said U-shaped legs and welded thereto.

6. As an article of manufacture, an insert adapted for embedment in a concrete slab and to form an anchor for a pair of lag screws, said insert comprising a pair of wire helixes disposed in spaced apart relation and adapted to have certain ends thereof disposed directly inwards of, and opening onto, one side surface of the slab, the inte riors of said helixes forming internal screw threads for receiving the shanks of the lag screws, a pair of side by side one piece U-shaped wire legs extending between the helixes and serving to space the latter apart, said U-shaped legs consisting of straight intermediate parts and straight end parts extending at right angles to the intermediate part, the outer ends of said end parts being arranged in direct abutment with, and welded to, the inner side portions of the helixes, and two pairs of L-shaped wire legs associated with, and disposed outwards Qf,f th helixes,'-respectively, said L-shaped legs consisting of straight first parts in parallel relation with the end parts of the U-shaped legs and straight second parts at right angles to the first parts and in substantially the same plane as the intermediate parts of said U-shaped legs, the outer ends of said first parts being in direct abutment with,

and welded to, the outer side portions of the helixes, said second parts of the L-shaped legs being positioned at obtuse angles with respect to said intermediate parts of the U-shaped legs and having welded thereto V-shaped wire feet, the apices of which extend away from the helixes and are adapted to space said second parts as well as said intermediate parts away from the other side surface of the'slab.

7. As an article of manufacture, an insert adapted for embedment in a concrete slab and to form an anchor for a pair of lag screws, said insert comprising a pair of wire helixes disposed in spaced apart relation and adapted to have certain ends thereof disposed directly inwards of,

and opening onto, one side surface of the slab, the interiors of said helixes forming internal screw threads for receiving the shanks of the lag screws, a pair of side by side but slightly spaced apart one piece U-shaped wire legs extending between the helixes and serving to space the latter apart, the U-shaped legs, consisting of straight intermediate parts and straight end parts extending at right angles to the intermediate part, the outer ends of said end parts side, being welded to the inner portions of the helixes, two pairs of L-shaped wire legs associated I parallel relation with the end parts of the U-shaped legs and straight second parts .at right angles to the first parts and intsubstantially the same'plane as the intermediate parts of said U-shaped legs, the outer ends of said first parts being arranged in direct abutment with, and welded to, the outer side portions of the helixes, second partsof the L-shaped legs being positioned at obtuse angles with respect to said intermediate parts of the U-shaped legs and having welded thereto V-shaped wire feet, the apices of which extend away from the helixes and are adapted to space said second parts as well as said intermediate parts away from said other side surface of the slab, inner cross wires extending at right angles to, andtacross the ends of, the intermediate parts of said U-shaped legs and welded to said ends of the intermediate parts, and outer cross wires disposed in parallel relation with the inner cross wires and welded to, and extending across, the inner ends of said second parts of the L-shaped legs.

References Cited in the file of this patent UNITED STATES PATENTS 888,671 Taxis May 26, 1908 2,100,614 Schenk NOV. 30, 1937 2,281,946 ONeill May 5, 1942 2,345,976 Hillberg Apr. 4, 1944 2,36- 3,156 Sinner et a1 Nov. 21, 1944 2,593,022 Gl'iV6l et a1 Apr. 15, 1952