US3411742A

US3411742A - Form tie anchor

Info

Publication number: US3411742A
Application number: US521946A
Authority: US
Inventors: John C Mcardle
Original assignee: Individual
Current assignee: Individual
Priority date: 1966-01-20
Filing date: 1966-01-20
Publication date: 1968-11-19
Anticipated expiration: 1985-11-19

Description

Nov. '19, 1968 J. c. M ARDLE FORM TIE ANCHOR 2 Sheets-Sheet 1 Filed Jan. 20. 1966 INVENTOR NOV. 19, 1968' MC RDLE 3,411,742

FORM TIE ANCHOR 1 Filed Jan. 20, 1966 2 Sheets-Shee 2 INVENTOR. JOHN C. MCARDLE ii I/MVAK ATTORNEYS United States Patent 3,411,742 FORM TIE ANCHOR John C. McArdle, 3300 S. Holly St., Denver, Colo. 80222 Filed Jan. 20, 1966, Ser. No. 521,946 8 Claims. (Cl. 249-205) ABSTRACT OF THE DISCLOSURE An anchor for the loop terminal of a form tie protruding from a concrete form wall, including a medial rib formed with spaced sides and a top joining the sides, to substantially fill the exposed opening of a loop terminal and maintain the sides of the loop spread apart, the top preferably being transversely curved and convex, to conform to the end of the loop terminal, with a fiat base integral with each opposite side of the rib and extending laterally and bearing against the form wall. Each flat base may be restricted in length when the rib tapers inwardly, to form a wedging surface, while a flat button extends both laterally and longitudinally from the end of the wedging surface. The flat base at each side may be longitudinally coextensive with the rib and have a slot adjacent the rib, to receive the sides of the tie loop. Such an anchor may be formed, as by stamping, from a single piece of metal.

This invention relates to the components used in concrete form structures and forming systems for the reception, retention and shaping of concrete mixes, and more particularly to components for forming systems which utilize twised wire form ties having end loops arranged to extend through the wall, a primary object of the invention being to provide a novel and improved anchor for connecting and holding the loop terminal of a tie extended through a form wall to thereby secure the tie in position.

conventionally, the form structures and systems with which the present invention is concerned involves the use of sheet panels, usually of plywood, as the primary members of the form-structure. Panels are arranged in opposition at each side of a form cavity and an array of ties traverse the cavity to hold these panels together. A common tie used for this purpose is formed by looping and twisting a length of wire into a rigid member of considerable strength and having a closed loop at each end. The terminal loops of each tie extend through aligned holes in the opposing panels and are conventionally anchored by extending metal rods through the loops. It is a common practice to align the array of holes in the panels in columns so that a single rod may be held vertically and threaded through all of the loops in a column extending from the surface of a given panel. After concrete is poured and set to form the structure, it is necessary to cut the loops for removal of the rod and ultimate removal of the panels from the concrete structure.

Though far better than old-time forming operations, this conventional operation is nevertheless tedious and time consuming, and there exists a need for a more simpe and rapid system of preparing and stripping forms. The present invention was conceived and developed with such a need in view and comprises essentially individual anchors for connecting the loop terminals at either end of an installed form tie.

It follows that further objects of the invention are to provide a novel and improved form tie anchor coactible with the end loop of a twisted wire form tie which is easily and rapidly connected with a tie loop; which, once connecied, may be secured against inadvertent displacement; which is readily and rapidly removable for dis- 3,411,742 Patented Nov. 19, 1968 assembly and stripping of the forms; which is available for reuse; which permits holes of ample size to be drilled in the form panel for easy reception of the ties with the anchor adequately overlaying the hole to prevent any significant bleeding of the concrete as it is poured; and, which is a simple, easily produced, low cost unit available for economical production in desired appropriate sizes.

Another object of the invention is to provide a novel and improved form tie anchor which does not require a cutting of the tie loop to release the anchor and which permits a subsequent and effective removal of the tie loop by simple twisting, rather than cutting actions, and permits, if desired, the subsequent reuse of the tie loop for connection of other structures to the concrete wall or anchors for shifting the form panels, as when the con crete structure is being poured in successive steps in a slip form operation. I 1

Another object of the invention is to provide ananchor for form ties which is extremely cheap to makeand therefore may be discarded after one use, or may be manufactured as a quality product for repeated reuse.

The foregoing and other objects may be accomplished through the preferred constructions illustrated in the accompanying drawings, in which:

FIG. 1 is an isometric view, in partial section, of a fragment of a typical concrete form assembly, including a form tie having loop terminals engaged by an anchor constructed in accordance with a first embodiment of this invention.

FIG. 2 is a front elevation, on an enlarged scale, of an anchor of FIG. 1.

FIG. 3 is a section, on the same scale as FIG. 2, taken along line 3-3 of FIG. 1, Le. longitudinally through the anchor.

FIG. 4 is a section, on the same scale as FIG. 2, taken along line 44 of FIG. 1 and transverse to FIG. 3.

FIG. 5 is an isometric view, similar to FIG. 1, showing a second embodiment of the invention.

FIG. 6 is a section, on an enlarged scale, taken along line 66 of FIG. 5, i.e. longitudinally through the anchor per se.

FIG. 7 is a transverse section, taken along line 7-7 of FIG. 6.

FIG. 8 is an isometric view, similar to FIGS. 1 and 5, showing a third embodiment of the anchor constructed in accordance with this invention.

FIG. 9 is a section, on an enlarged scale, taken along line 99 of FIG. 8 and longitudinally through the anchor.

As typified by FIGS. 1, 5 and 8, it is the usual practice to utilize as concrete forms, a pair of upright, spaced,

parallel panels or walls 10 and 11, as of plywood, inter tion are designed to fit into these loops 13, to thereby co-,

act with the ties to hold the form walls in place against the pressure of freshly poured concrete. For illustrative purposes, there are shown, in several views of the drawings, a tie T which is fabricated to provide a central twisted wire tensionmember, with the end loops 13 arranged to determine a fixed spacing between the faces of the walls 10 and 11, when these ends are passed through the holes 12 in the wall panels and properly secured by anchors. Transversely offset prongs 15 are disposedwithin the span of the form spacing to provide a temporary abutment for the faces of the walls and 11 during erection and before the walls are separated by spacers or by the pressure of the concrete poured into the form. Application and use of the ties T involves providing the holes 12 of a size corresponding to the width of the terminal loops 13 and the holes are drilled in the panels in aligned pairs, oposite each other. As aforestated, the type of anchor most common used previously, i.e. rods extended through a plurality of the loops on each side of the form, the holes 15 were also required to be in alignment, in rows, usually either or both horizontally and vertically. Needless to say, the time consumed in threading a rod through the loops of several form ties is considerable, while driving a rod out of the loops of several form ties, or cutting the loops individually for removal of the rod, after the concrete has set, is also unduly time consuming.

The anchors A of FIGS. 1-4 are simple, integral units, expediently formed by stamping or pressing from sheet metal to provide flat, opposing, flanged bases 16- and 17, of desired extent and preferred outline, symmetrically flanking a straight channel rib 18 medially thereacross. In perpendicular projection from the

bases

16 and 17, the rib 18 is crowned and conformed for reception through and to substantially fill the opening embraced by the portion of a loop 13 projecting exteriorly of a wall 10 or 11. Thus, rib 18 has spaced, parallel sides and a transversely curved, convex crown or top. The fitting of the rib 18 into a loop 13- is realized through the provision of a slot 19 along each side of rib 18 and extending upwardly in each

base

16 and 17 approximately half the length of the rib 18, in a width of slidably receive the loop as the lower end of the rib, as shown. With the slots 19 closed at about the mid-length of the rib 18 and the rib entered downwardly through the loop and tapped to wedge the sides of loop 13 against the converging lower side of hole 12, the anchor is reasonably secure against inadvertent displacement from covering relation to the hole 12 and thrust coaction of its

bases

16 and 17 with the exterior face of the wall. However, complete security of anchor emplacement may be provided by a simple fastening device, such as a nail 20, driven into the panel through a hole 21 near the lower end of rib 18, as shown, or a hole 22 in the upper portion of the

base

16 or 17.

The tie anchor is further expediently used at the vertical juncture of two panels for the anchor may connect with a tie lop 13 disposed at the juncture and connected to each of the two panels by placing nails in both of the holes 22 or in the hole 21 and a hole 22, when the tie is rotated 90 degrees from the position shown and placed at the juncture of the two panels.

While the slots 19 are arranged for easy insertion of the rib 18 over the tie loop 13, and it is contemplated that the anchor may be held in place by a nail, an automatic locking of the anchor on the tie loop is possible by the use of knobs 19 formed as dents in the walls of the rib 18, as illustrated in broken lines at FIG. 2, these knobs being spaced apart sufficiently to require a snapping of the wire loop 13 past them, or springing whenever the anchor is inserted into the loop or removed therefrom.

As will be evident, after the concrete has set, the nails may be pulled from all the anchors on one or more panels and each anchor then merely tapped out of loop 13, as with a hammer. The panel can then be removed from the concrete, since the holes 12 will move outwardly over the loops 13. Thus, there is no necessity for cutting the tie loops 13 to free rods, each engaging a number of ties. After the panel is removed, the loops 13 may be cut off at the edge of the concrete wall, or the loops 13 provided with break-back notches 23, as in FIG. 9, at the outer edge of the wall, so that each loop 13 may be bent several times in a transverse direction and thereby be broken off. Also, with the present arrangement, the break-back notches 23 may be eliminated and the tie ends broken ofl? by inserting a simple crank in the loop 13 and twisting the loop in the concrete Wall, this operation also breaking off the small concrete stub formed in the hole, as the wall is poured.

An alternative anchor A, shown in FIGS. 5-7, is also an integral unit of sheet metal, preferably of a heavier type. The anchor A is characterized by a

flat base

25 and 26 at each side, each being desired size and outline, such as semicircular, symmetrically flanking a straight channel rib 27 disposed medially thereacross and having a size and conformation for coaction with a loop 13 of a tie T, as shown. Thus, rib 27 has spaced, parallel sides and a transversely curved, convex crown or top. The extended end of rib 27 is tapered to form a wedging edge 28, provided by the transversely curved, convex top or crown joining the sides which taper in depth. As in FIG. 5, the crown or top forming wedging edge 28 may be slightly flattened, as shown. A laterally extending button 29 is formed at the end of edge 28. The

bases

25 and 26 are desirably braced against lateral deflection relative to the rib 27 by gussets 30 which are formed by drawing the metal as the bases are folded out of the planes of the sides of the rib.

The button 29 preferably has a width slightly greater than the inside width of loop 13 for enhanced bearing surfaces, but the button can be inserted through the lip, with the attachment A being turned sideways or twisted sulficiently for each insertion. Once threaded into the loop, the attachment is tapped, as by a hammer, further into the loop, so that the loop will ride upon wedging edge 28 until the sides of the loop engage

bases

25 and 26, as in FIG. 5. The end of loop 13 will, of course, have been wedged up onto the rib 27, and prong 15 will be pulled against the inside of the panel. In order to facilitate locking of this attachment to the loop, a bump 28 is formed at each side of the rib 27 opposite the top of the wedge portion 28, the bumps 28 being of suflicient extent as to require the sides of the loop 13 to spring apart and snap together as the attachment is wedged into place on the loop.

In the case of both attachments A and A, the attachment covers most of hole 12, and any leakage or bleeding of the concrete mix out through holes 12 will be reduced considerably. Other advantages of the attachments A and A are that each is much smaller and easier to transport 'and store than rods, they do not require any alignment of loops 13 of the ties, may be placed in the ties, as the ties are placed in the panels, and may be individually removed without cutting the tie loops. Each attachment, of course, can be used many times on successive jobs. A further advantage of the anchors A and A is that the holes 12 may be circular, and thus may be drilled in the panels, since the attachments minimize the leakage of the concrete mix. With such attachments, to minimize leakage, it would be necessary to form holes 12 as thin, narrow slots to fit the tie loops 13, which require the use of routing rather than drilling equipment and not only increase the difficulty of forming properly aligned and spaced slots, but also increase considerably the time necessary to produce the slots, adding materially to the cost.

Functionally adequate for the installation of concrete form ties, a simple and least expensive anchor embodiment, illustrated in FIGS. 8 and 9, is the combination of a clip C and a flat washer W. The clip C is formed from a length of suitable rod or strong wire material, bent to form opposed legs 37 disposed in parallel relation and joined at one end by an eye 36. Free ends 37 of the legs are spread laterally, to limit movement of the clip through the tie loop 13 and to bear against the washer W, while the eye 36 serves as a passage for a fastener, such as a nail 20, effective in attachment to the panel for retention of the installed clip. The clip C may be made sufliciently inexpensively that it may be discarded after one use, but is readily installed and also readily removed, having the same advantages in installation and removal, over long rods, as the previous embodiments. The washer W may be a simple, fiat, circular washer having a diameter sufficient to overlay the hole 12 and a circular hole of a size sufficient to receive a loop 13, as shown. However, where it is desired to provide for a most ellective closure of the hole 12 in the panels, the washers may be provided with slotted holes in a manner, now shown, which adequately receives the loops 13 without sufficient space to permit any significant bleeding. Such washers are formed by stamping operations and may be either conventional types or special slotted types, if the demand is adequate.

This simplified clip C is fully adequate for the purposes set forth, although it is to be noted that it will require a shorter tie T than the constructions heretofore used for the same wall width.

Since changes, variations and modifications in the form, construction and arrangement of the elements shown and described may be made without departing from the spirit of the invention, it will be understood that the invention is not limited by any details of the illustrations and foregoing description, but only by the proper scope of the appended claims.

What is claimed is:

1. An anchor for the loop terminal of a form tie pro truding from a concrete form wall comprising:

a rigid member having a rib formed with spaced sides and a top joining said sides to substantially fill the exposed opening of the loop terminal and maintain the sides of said loop spread apart; and

a flat base connected with each of the opposite sides of said rib and extending to each side laterally of said rib for bearing against said form wall.

2. A form tie anchor as defined in claim 1, wherein:

a portion of said rib tapers inwardly and the corresponding portion of said top forms a wedging surface for moving said loop terminal outwardly as said member is forced therein.

3. A form tie anchor as defined in claim 2, wherein:

a base extends laterally from each side of said rib at positions spaced from said tapering portions; and

a fiat base at the end of said tapering portion extends both laterally to each side and longitudinally from said tapering portion.

4. A form tie anchor as defined in claim 3, wherein:

each side of said rib is provided with a laterally extending bump spaced from the corresponding lateral base, whereby the respective side of said loop terminal, after relative movement past said pump, is received between said bump and said lateral base to restrain longitudinal movement of said loop terminal side.

5. A form tie anchor as defined in claim 1, wherein:

said top of said rib is transversely curved and convex to engage the end of said loop terminal.

6. A form tie anchor as defined in claim 5, wherein:

said base at each side is substantially coextensive longitudinally with said rib and provided with a longitudinal slot adjacent the respective side of said rib for receiving the respective side of said loop terminal.

7. A form tie anchor as defined in claim 1, wherein:

said rib is integral with each said base in a manner characteristic of being formed from a single piece of metal.

8. An anchor for the loop terminal of a form tie protrusive exteriorly of a concrete form wall comprising:

a rigid member having means arranged to bear upon contiguous areas of the form wall;

a straight, rigid rib offset from and medially of said bearing means in a transverse conformation engageable with and to substantially fill the protrusively exposed opening of the loop terminal;

said bearing means including a flat base at each side of said rib, with a portion of said rib extending longitudinally past each said base and tapering inwardly to provide a wedge surface for moving said loop terminal outwardly as said member is forced therein; and

a flat button coplanar with said bases at the outward end of said wedge surface and extending laterally beyond said rib.

References Cited UNITED STATES PATENTS 1,684,136 9/1928 Lynch 249-40 XR 1,924,630 8/1933 Toogood. 2,583,962 1/1952 Neptune 249-40 3,167,842 2/1965 Pauli 249-46 2,190,748 2/ 1940 Williams 249-46 FOREIGN PATENTS 486,082 8/ 1952 Canada.

WILLIAM J. STEPHENSON, Primary Examiner.