US1850402A

US1850402A - Form tie for wall structures

Info

Publication number: US1850402A
Application number: US517515A
Authority: US
Inventors: Lampert Lydia
Original assignee: UNIVERSAL FORM CLAMP CO
Current assignee: UNIVERSAL FORM CLAMP CO
Priority date: 1931-02-21
Filing date: 1931-02-21
Publication date: 1932-03-22
Anticipated expiration: 1949-03-22

Description

FORM TIE FOR WALL STRUCTURES Filed Feb. 21, 1931 jwwzz? By Kg; flZZ W forms of wood which are removed when the Patented Mar. 22, 1932 UNITED STATES PATENT OFFICE LYDIA LAMPERT, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNIVERSAL FORM CLAMP 00., OF CHICAGO, ILLINOIS, A GORPORATIONOF ILLINOIS FORM TIE FOB WALL STRUCTURES Application filed February 21, 1981. Serial No. 517,515.

This invention relates to form clamps for use in the construction of concrete walls such as piers, abutments, retaining walls and similar. structures.

Concerte walls are usually constructed in concrete is sufficiently set to be self-sustaining. These walls are often built to a considerable height or vertical depth and 1t,

therefore, becomes necessary to hold the embedded tie rod after the concrete has set.

The couplings are usually tapered and are threaded to the ends of the tie rod. In constructions heretofore in use, the couplings have also been threaded to the end bolts.

With prior forms of ties, considerable difficulty has been experienced in removing the couplings after the concrete has set because the concrete, while hardening, exerts a great deal of pressure on the couplings and tends to bind them to the tie rod. It is, therefore, desirable to slightly loosen the coupling from the concrete by partially unscrewing it before the concrete has completely set and before the forms are removed. This has not been possible with form ties heretofore in use because the couplings were threaded to the end bolts and the couplings could not be loosened without removing the forms.

The main objects of this invention are to provide a form tie having an improved form of coupling; to provide an improved form or" end bolt for attachment to the coupling; to provide improved means for detachably connecting the end bolt to the coupling without the use of threads; to provide means of this kind which will permit adjustment of the end bolt whereby the form tie may be expanded and contracted to accommodate forms of different sizes; and to provide a form tie of this kind wherein the couplings may be slightly loosened from the concrete before removal of the forms. 1

D An illustrative embodiment of this inventron is shown in the accompanying drawings, wherein Figure 1 is a vertical transverse section of aconcrete wall, showing part of a form and one of the improved ties.

Fig. 2 is anouter end view of one of the improved couplings.

Fig. 3 is an axial section of the coupling, taken on the line 33 of Fig. 2, and showing also the ends of the bolt and tie rod which cooperate therewith.

Fig. 4 is a view similar to Fig. 3 but taken on the line 4-4 of Fig. 2.

Fig. 5 is a transverse section of the coupling, taken on the line 55 of Fig. 4-

Figs. 6, 7 and 8 are sectional details showing three difierent forms of clamps for use on the outer ends of the end bolts.

In the construction shown, the improved form tie is applied to the customary type of wall form comprising side members 1, studs 2 and battens 3.

In the form shown, each of the improved ties comprises an intermediate tie rod 4 and a pair of end bolts 5 alined axially and detachably secured together by coupling nuts 6.

The tie rod 4 is shorter than the distance between the form sides 1 and the ends of the rod are threaded for engagement with the nuts 6. This construction permits the nuts to be readily adjusted relative to the tie rod and to each other.

The outer ends of the bolts 5 may be provided with any one of various clamps to secure the form against spreading. In the con-- struction shown in Figs. 1 and 6, the bolts 5 are provided with slots 7 for receiving wedges 8, which are adapted to engage the outer faces of the battens 3. Heads 9 are also formed 7 bolt {5V is provided with a clamping collar 12v havin a set screw 13 for locking the collar to the It.

Mounted on the inner end of each of the bolts 5, is a key 14 forming one part of the ba onet joint which detachably and adjust- .ab secures the bolt to the coupling.

e coupling nuts 6 are preferably tapered so as to facilitate their removal from the concrete. At one end of each coupling nut, is a threaded bore 15 for receiving the tie rod 4 and at the other end of each nut is a counter bore 16 for receiving one of the end bolts 5.

Formed in the counter bore 16, is a plurality of bayonet grooves 17 spaced apart axially and separated from one another b annular ridges 18. The ridges 18 are provided with axiall alined notches 19 to permit the key 14 to shifted into any one of the grooves 17 by the axial movement of the bolt 5 relative to the coupling nut. The key 14 is shifted into locking engagement with any one of the ridges 18 by a partial rotation of the bolt 5 relative to the coupling. Extending axially through the ridges 18, is a pin 20 forming a stop adapted to engage the key 14 to limit the rotation of the bolt 5 relative to the coupling.

In operation, the rod 4 and end bolts 5 are supported on the form in the manner illustrated in Fig. 1. and the coupling nuts are adjusted so that the form sides 1 will be spaced the required distance from each other. An initial rough adjustment of the end bolts 5 may be obtained by means of the bayonet joints. After the keys 14 have been shifted into the desired bayonet grooves, the outer ends of the bolts 5 are secured to the battens by any one of the clamps shown in Figs. 6, 7 and 8.

Before the concrete has completely set, a wrench may be applied to the outer ends of the bolts 5 for partially turning the coupling nuts so as to slightly loosen them from the concrete. This may be accomplished without removing or shifting any of the form parts. After the coupling nuts have been slightly loosened, the parts are all left in place until the concrete has thoroughly set.

To dismantle the form, the end clamps are first removed from the bolts 5 and the

form members

3, 2 and 1 may then be removed. The coupling nuts may then be removed from the concrete and from the tie rod 4 by rotating the bolts 5. After the coupling nuts are removed, the holes in the faces of the concrete are patched so as to present smooth surfaces.

Although but one specific embodiment. of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim:

1. A form tie comprising a tie rod and an end bolt alined axially, form clamping means on the outer end of said tie rod, a wed e seated in the outer end of said bolt, a con 1n nut for detachably securing the inner en s 0 said rod and bolt together, said nut having an axial bore, one end of said bore being threaded for engagement with said tie rod, the other end of said bore having a plurality of ridges spaced apart axially and provided with notches, a key on the inner end of said bolt adapted to be passed through said notches by the axial movement of said bolt and to be shifted into locking engagement with either of said ridges by a partial rotation of said bolt relative to said nut, and a shoulder in said bore adapted to engage said key to limit the rotation of said bolt relative to said nut.

vided with notches, a key on the inner end of said bolt adapted to be passed through said notches by the axial movement of said bolt and to be shifted into locking engagement with either of said ridges by a partial rotation of said bolt relative to said nut, and a pin extending axially through said ridges to form a stop for engaging said key so as to limit the rotation of said bolt relative to said nut.

Signed at Chicago this 19th'day of February, 1931.

LYDIA LAMPERT.

2. A form tie comprising a tie rod and an 5 v