Title:
Wall tie
United States Patent 2115137


Abstract:
This invention relates to the general art of masonry and concrete structures, and more specifically to bonding and tying devices for such structures. In a well known form of such devices metal anchor channels, usually of dovetail form in cross-section, are embedded in the surface portion of...



Inventors:
Bosco, George B.
Application Number:
US17286937A
Publication Date:
04/26/1938
Filing Date:
11/05/1937
Assignee:
Bosco, George B.
Primary Class:
Other Classes:
52/704, 52/710
International Classes:
E04B1/41
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Description:

This invention relates to the general art of masonry and concrete structures, and more specifically to bonding and tying devices for such structures.

In a well known form of such devices metal anchor channels, usually of dovetail form in cross-section, are embedded in the surface portion of a concrete column, and in these channels are inserted at intervals the correspondingly shaped heads of key strips, the body portions of which project from the side of the column and have transverse corrugations or teeth that are embedded in the mortar of a masonry facing that is built up entirely or partly around the column to conceal the latter. These anchor channels are fastened to the inner surface of the wall of the wooden form of the concrete column, usually by nails driven through the transverse limb of the channel into the wall of the form.

As the concrete is poured into the form it is usually stirred by mechanical agitators to prevent voids in the concrete body, and this often has the effect of loosening the nails and causing cracks or gaps between the edges of the channel and the inner surface of the form. The lateral thrust of the wet concrete also causes the wall of the form to bulge outwardly more or less, unless it is very strongly supported against such bulging, and this bulging also creates cracks or gaps between the edges of the channel and the inner surface of the form. Through these cracks or gaps, whether resulting from either or both of the above named causes, the wet concrete works into the channel, more or less filling and clogging the latter, so that the mason has difficulty in entering and properly positioning the heads of the key strips, and frequently finds it necessary to dig the concrete out before he can properly enter and place the heads of the key strips; and this involves extra labor and loss of time.

One object of this invention is to provide an improved means for attaching the anchor channels to the wall of the form by which the above mentioned cracks or gaps cannot occur from either of the above mentioned, or any other, causes, so that no time and labor are lost in cleaning mortar out of the anchor channel.

Again, the pressure of the wet mortar against the side walls of the channel often bends the side walls inwardly on their joints with the transverse wall to such an extent that, because of the resultant narrowing of the channel, it is difficult or impossible to properly position the heads of . the key strips therein. Another object of the invention is to provide an improved attaching means for the anchor channel by which such lateral bending or displacement of the side walls of the channel cannot occur.

The anchor channels are made in sections which are successively nailed to the form wall in endwise abutting relation; and considerable skill and care are required to attach the successive sections in accurate alinement with the meeting ends of the side and transverse walls of a previously applied section in perfect register with each other. A still further object of this invention is to provide a means for facilitating such alinement of meeting sections, such means in its preferred form consisting of a compressible elastic strip, such as a strip of felt, that can be pressed into each section through its open side and when so entered expands laterally and fills a longitudinal portion of the section and projects beyond one end of the section. When one such loaded section has been nailed in place on the form, the next abutting section, similarly loaded, is applied, its empty portion being forced over the exposed projecting portion of the preceding strip, so that the latter spans the joint between the meeting ends of the two sections and thus serves as a sort of mandrel to center the two sections in alinement with each other. After the form has been taken down, the felt strips are dug out and re-used or discarded. Illustrative embodiments of the invention are shown in the accompanying drawing, in which:Fig. 1 is a fragmentary elevation viewed from the inner side of a form, showing two vertically alined anchor channels secured thereto by my improved attaching means, and also showing a portion of the temporary felt alining strip.

Fig. 2 is a horizontal section, taken on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal section through a portion of the concrete column, showing the wall of the form removed, the anchor channel embedded therein, and the projecting portions of the nails cut off.

Fig. 4 is a fragmentary horizontal section showing a hollow tile facing anchored to a vertical anchor channel in a concrete wall by my improved wall tie.

Fig. 5 is a vertical section, taken on the line 5-5 of Fig. 4. Fig. 6 is a view similar to Fig. 4, but showing the hollow tile anchored to a horizontal anchor channel in a concrete wall.

Fig. 7 is a vertical section taken on the line 7-7 of Fig. 6. Fig. 8 is a perspective view of the key strip appearing in Figs. 4 and 5.

Fig. 9 is a perspective view of the key strip appearing in Figs. 6 and 7.

Referring first to the form and application of the invention shown in Figs. 1 to 5 inclusive, 10 designates a wooden form wall, to the inner surface of which is applied a vertically disposed anchor channel I of the dovetail form in crosssection clearly indicated in Figs. 2 and 3. The anchor channel I is- commonly made in predetermined lengths that are applied in endwise abutting relation to the height or length required by any particular job, the line 12 in Fig. 1 indicating the joint between the meeting ends of. two adjacent sections.

The side limbs of the channel have on their free longitudinal edges, outwardly directed flanges 13.

Before the concrete is poured into the form, the anchor channel is secured to the wall 10 by nails 14. These nails are preferably applied as shown in Fig. 2, being located on the outer sides of both side walls of the channel and preferably in contact with said walls, and driven through the flanges 13 into the form wall 10 obliquely to the plane of the latter. The nails are formed with heads 15 that overlap the transverse limb of the channel, and preferably the heads are each formed with a' tooth 16 that, as the nail is driven home, bites into the transverse limb and thus locks the nail against spreading outwardly of the channel..

This attaching means is very effective to prevent the presence of any crack or gap between the flanges 13 and the form wall I0 due either to the concrete puddling operation or to swelling and consequent bending of the form wall, and the described manner of applying the nails leaves the interior of the channel free and unobstructed for the ready application of the key pieces.

To facilitate the accurate alining of the sections of the anchor channel, I preferably employ filler strips 17 of felt or similar: compressible elastic material that can be inserted through the open side of the channel and will then expand and virtually fill the latter. Each section of the filler strip 17 is entered into its channel section before the latter is nailed to the wall, and a portion of it projects beyond the end of the channel section, as indicated in Fig., 1, so that the empty portion of the next adjacent channel section may be forced over the projecting portion of the strip, as shown in Fig. 1, the latter thus serving as a temporary mandrel to aline the two sections at their meeting ends. ., Incidentally, the ffiller strip 17 further serves to prevent the entrance of concrete to the channel during the concrete pouring operation in the event that any small cracks or gaps should develop due to irregularities in the surface of the form wall, or other causes. After the concrete has set around the anchor channel, the filling 17 is withdrawn to make room for the key strips. In constructions where the anchor channel is vertical, a key strip 18 of the form shown in Figs. 4, 5 and 8 is employed; and where the anchor channel is horizontal, as shown in Figs. 6, 7 and 9, a key strip such as 19 is employed. The key strip 19 differs from the key strip 18 only in having its shank warped through an angle of 90 degrees to form a vertical head 19' for engagement with the horizontal channel II'. The other end of each key strip is split and the portions on each side of the split are turned in opposite directions to form teeth 20 that, as shown in Figs. 5 and 7, are emedded in cement 21 between and connecting adjacent tiles 22 of a hollow tile facing that is applied to the concrete column or wall; the key strips usually spacing the facing approximately one inch from the column or wall. The structural forms of the key strips 18 and 19 herein shown are old and known, and no novelty is claimed therefor.

As shown in Fig. 1, the nails 14 on the two, sides of the channel are preferably located in alternating or staggered relation.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that details of the construction shown may be altered or omitted without departing from the spirit of the invention as defined by the following claims. I claim: 1. In a wall tie of the class described, the combination with an anchor channel of dovetail form in cross-section, of means for attaching said channel to a form wall consisting of nails driven into said wall obliquely to the plane of the latter and lying crosswise of and substantially parallel with both side walls of the channel and having heads overlapping and contacting with the transverse limb of the channel. 2. In a wall tie of the class described, the combination with an anchor channel, of means for attaching said channel to a form wall consisting of nails driven into said wall obliquely to the plane of the latter, said nails lying on the outer sides of both side walls of the channel and having heads overlapping the transverse limb of the channel, and said heads each having a tooth adapted to bite into said transverse limb.

3. In a wall tie of the class described, the conbination with an anchor channel having outwardly directed flanges on the free longitudinal edges of its side walls, of means for attaching said channel to a form'wall consisting of nails driven through said flanges and into- said wall obliquely to the plane of the latter, said nails lying .on the outer sides of both side walls of the channel and having heads overlapping and contacting with the transverse limb of the channel.

S4. In a wall tie of the class described, the combination with endwise abutting anchor channel sections, of means for alining the meeting ends of said sections when attaching them to a form wall consisting of a transversely compressible strip of resilient material filling and projecting beyond the meeting end portion of one of said sections and adapted, when said one section is attached to the wall, to enter and fill the meeting end of the other section when said other section is attached to the wall, said strip being insertible and removable laterally through the.open sides of said sections.

GEORGE B. BOSCO.