US2274773A - Form tie - Google Patents

Description

March 3, 1942.

G. H. -BUGENHAGEN `FORM TIE Filed Nov. 3o, 1940 "IIIIIIII Patented Mar. 3, 1942 eres PATENT OFFICE i claim.

The objects of my invention are, rst to provide a tie that develops a maximum of tensile strength for the cross sectional area used. Second, to provide a form tie that provides gauge stops formed by the body metal without a loss in cross sectional area. Third, to provide means that facilitate the removal of the anchor nails from the tie ends when dismantling the construction forms. Fourth, to provide a form tie with -a larger bearing area at their respective anchorages, in order to reduce cutting into, or crushing of the timber uprights under stress. Fifth, to provide a form tie that may be nested in packaging for shipment.

I attain these objects in the device shown on the drawing, and hereinafter described, in which Fig. 1 is an isometric sectional view showing the form tie adapted between two construction form faces. Fig. 2 is a partial transverse section on line A-A of Fig. 1, showing the gauge stops formed by a drawing of the body metal. Fig. 3 is a cross section of the form tie on line B-B of Fig. 1 showing the member deformed for the purpose of stiffening. Fig. 4 is a part section of the nailed anchorage, taken on line C-C of Fig. 1 showing a raised stop adjacent to the nailing hole for the purpose of keeping the nail head sufficiently raised to facilitate being engaged by a hammer claw or a similar tool for the removal of the respective nail.

Referring to the drawing in Fig. 1, the form facings I and 2'he1d in position by the respective uprights 3 and the said uprights tied together by the form tie 5, the ends of which are securely fixed to the upright 3 and i with nails 6 and l as shown.

The middle deformed portion of the form tie provides a strut-like stiffness, the ends 9 and Il'i of the V shaped deformed portion are formed to provide suitable gauge stops, are clearly shown in Fig. 2 and Fig. 3, the deformed section and gauge stops are separated to suit any desired thickness of wall to be constructed. This method of providing the gauge stops 9 and l0 does not sacrifice any of the metal cross sectional area.

In Fig. 4, a stop l I is shown to limit the penetration of the anchor nail 1, so that the claw of a hammer may easily engage the head of the nail to facilitate its withdrawal.

In operation, my device functions as follows:

In general practice, one entire wall facing is (Cl. 25u-131) erected first, with one end of the form ties placed between the boards and the said tie ends nailed to the uprights with the stop gauge snugged against the inner facing of the forming; after one side of the construction form has been erected, the opposite side is erected from the bottom up, by lling in with boards and anchoring the form ties in succession, thus permitting the workmen to complete the construction forming entirely from the outside. The stifiening and gauge feature of the device servesV only during the erection of the forms, whereas the use of unstiffened members would be unmanageable. Obviously, the members most important function is to sustain tensile stress caused by the hydraulic pressure of the concrete. When the forms are dismantled, the rst operation is removal of anchorage nails in the form tie ends, thus the accessibility of the nail heads to engage the claw of a claw hammer in the device, greatly facilitates removal of the anchor nails and the dismantling of the forms. After the forms `are removed, the projecting tie ends may be easily twisted off with a suitable tool.

I :am aware that there are other form ties on the market, but not to my knowledge have the improvements of my device been incorporated, and I therefore claim as follows:

A combination in a form tie for use in constructing forming for concrete construction, having a thin flat metal strip, the ends forming anchorage extensions adapted to be tied to uprights of the opposite form facings by nails thru perforations in the anchorage ends of the said strip, the middle portion of the said strip being deformed into a V groove for stiffening, the ends of the said V groove projecting below the nailing anchorage extensions to form opposite gauge stops, the respective planes of the said extensionsV turned approximately at right angles to the deformed middle V grooved portion at a suitableV distance outwardly from the aforesaid gauge stops, the said nailing anchorage extensions perforated to form suitable nailing means, the said perforations provided with an upturned stop to sustain the head of anchorage nails at a suitable height to facilitate the engaging of a hammer claw or a similar device for the withdrawal of the said rails.

G. H. BUGENHAGEN.

Images