US1997638A - Tie for concrete forms - Google Patents

Description

April 16, 1935. D. H. HAYDEN TIE FOR CONCRETE FORMS Original Filed Sept. 1, 1951 Dal/M flame/ Patented Apr. 16, 1935 QZUNITEDIsrATEs PATENT OFFICE t v I TIE massa es FORMS" I t Y 13.0mm. (01. 25 -131) The present invention relates toties for concrete forms, and seeks to provide a simple, efficient tie which can be readilyapplied to concrete forms or molds for securely holding the walls in posi- *5 tion. The particular object is to provide means in connection with the 'tie which will give an indication when a maximum or excessive load is applied to'the'tie. A further objectis to provide improved means for securing the tie in place.

"The invention consists in the features of improvement hereinafter set forth, illustrated in its preferred form in the accompanying drawing and more particularly pointed out in the appended claims. p

In the drawing':--- v Fig. lisa perspective view of a portion of a form for a concrete wall with one of the improved ties applied thereto. 1 f Fig. 2 is an enlarged detail view of one end of the tie with parts shown in section.

Fig. 3 is a'similar viewof the opposite end of the tie.

Fig. 4is asection on the line 45 of Fig. 2. The improved tie is applicable to many different forms or molds; Thatshown in Fig. l is adapted for the formation of a concrete wall. It comprises wooden boards a over the outer faces of which extend vertical stifi'ening uprights b.

Horizontal braces or Whalers c extend across the Spreaders and ties are arranged at intervals along the lines of the Whalers to maintain the walls of the mold or form in position during the pouring and setting of the concrete. As setforth in the prior U. S. Letters Patent No. 1,733,686, issued to me on October 29, 1929, each tie preferably com prises two, steel wires which may extend through holes formed inthe walls and braces of the mold, but which, in the case of a wall form, preferably extend between the Whalers c of each pair and between two adjacent boards a. The form board immediately above the tie wires 1!! can be hammered down into *sufficientlysnug contact with the board immediately below it to prevent leaking ofthe concrete.

The ends of each tie are provided with form clampingcollars or abutments and preferably the two Wires are permanently fixed to a collar H which forms a head at one end of the tie. Inthe form shown, the wires I0 extend through openings in the collar or head II which are slightly larger in diameter than the wires, and the end portions of the wires are then upset to snugly fill the'openings, and the outer ends of the wires are riveted over the outer face of the head of the collar II as shown;

The opposite ends of the tie wires l0 extend through openings or elongated slots l2 in the sections of a U-shaped collar or abutment member l3, which is formed from a short piece of steel strap bent between its ends into U-form. The! wires ill are firmly secured to the collar or abutment [3 by a' wedge or wedging key l5 which is adapted to be driven inwardly through the slots {2 and between and in parallel relation with the tie wires.

When applied to the form,'the inner faces of the collars or abutment members H and i2 may engage the outer faces of the form structure, but preferably, when applied to a wall form as shown in Fig. 1, the head H and collar l3 bear against large thin metal washers I 6 having round holes ll through which the tie wires extend. In the form shown, these, Washers or plates iii are square in form and are provided at their corners with holes for receiving nails [8 for assisting in holding the Whalers in place.

Upon application of the tie to the form, the wires are drawn tightly to position, and, in a wall form, to press the sides of the form firmly against the spreaders d which hold the sides in proper spaced relation during the pouring of the concrete. When the wires are drawn taut by means of a suitable tool and, while held taut, the clamping collar 13 is secured to the wires by means of the wedging key which is driven inwardly between and in parallel relation with'the tie wires, so that the latter are securely clamped between the wedging key and the rounded seats 64 at the ends of the slots 12 of the collar.

The wedging key l5 has substantially parallel sides and tapered edges and, to aid in securely gripping the wires, thetapered edges are provided with grooves or concave seats is which fit the wires. Also, to prevent the wedges from working outwardly and so loosening the clamping action, the inner wedge shaped portion of the key isprovided on its seats IS with a series of shallow, outwardly facing teeth 26 extending transversely across its concave seats and which indent the wires sufficiently to prevent the outward movement of the wedge when'once driven into position. It is noted that the seats ii) on the tapered edges of the wedging key are substahtially straight so that the key does not tend to kink or weaken the tie wires.

The tie wires It and wedge 15 are preferably formed of hard steel and the U -shaped collar, I3 is formed of somewhat softer, mild steel, so that the wedge and wires are not materially deformed or weakened when the wedge is driven into position between the wires. But the softer U-shaped collar is slightly deformed. That is to say, the metal at the ends of the slots I2 is crowded outwardly to a slight extent. Also, because of the Wedge form of the key, the wires are more firmly and rigidly secured to the outer section of the U-shaped collar than they are to its inner section, since the slots l2 are equal in length before the key is applied. For this reason, a heavy load on the tie will tend to draw the outer section of the U-collar toward its inner section. Preferably, the parts are so designed that this slight yielding of the outer section of the U-collar, which is normally spaced from the inner section, will take effect when the maximum safe load is applied to the tie.

It is further noted that, when the tie is applied to the form as described, the outer collar section or member is spaced slightly from the form structure by the inner member and the bend of the collar, and, as the strain on the tie is applied chieiiy to the outer member, the bent portion will yield under maximum or excessive load and the collar members will be forced toward each other to a limited extent lengthwise of the tie.

Thus the slightly yielding clamp collar of the tie forms an important feature of advantage since it gives a positive indication when a maximum or excessive load is applied to the tie, long before the load becomes suflicient to rupture the tie or break the form. The pressure of concrete as it is poured into a form varies greatly with the temperature of the concrete and also with the rapidity with which it is poured. It also, of course, varies with the shape of the form and, in a wall form, it varies greatly with the thickness of the wall being formed. Thus, if a suflicient number of ties are not used, or if the concrete is poured too fast, or at too low a temperature, the ties are apt to give way and the form collapse. But with the improved tie, the closing of the U-collars will indicate when the maximum or an excessive load is reached long before the tie is ruptured, so that constructors can properly regulate the number of ties, the temperature of the concrete, and the rapidity with which it is poured. The improved tie can be very easily and readily applied to the form, and the wedging key securely clamps the collar. to the tie wires without decreasing the strength of these parts. Changes may be made in the details set forth without departure from the scope of the invention as defined by the claims.

I claim as my invention:-

1. A tie for concrete forms comprising a tie member, clamping collars thereon for resisting outward pressure on the sides of the mold form, one of said collars comprising inner and outer sections spaced apart and adapted to be forced together, and means for applying the strain on the tie member to said outer section, whereby the latter will yield slightly under heavy loads in the direction of the length of the tie member.

2. A tie bolt for concrete forms comprising a tie wire, clamp collars on the ends of the tie wire, and means for securing one of said collars in adjusted position on the tie wire, and one of said collars comprising an inner section forming an abutment member for the tie bolt and an outer section rigidly secured to the tie wire and adapted to be drawn inwardly to a slight extent under maximum load.

3. A tie bolt for concrete forms and the like, comprising a tie wire and a U-shaped collar forming an abutment member for the tie bolt, said collar being provided with openings in its sections through which the wire extends and having its outer section rigidly secured to the wire, whereby said outer section is adapted to be drawn toward the inner section of the collar under heavy load.

4. A tie bolt for concrete forms, comprising a tie wire, clamp collars on the ends of the tie wire, forming abutment members for the bolt, and means for securing one of said dollars in adjusted position in the tie wire, and one of said collars being U-shaped with openings in its sections through which the wire extends and having its outer section rigidly secured to the wire and adapted to be drawn toward the inner section of the collar under maximum load.

5. A tie bolt for concrete forms and the like, comprising a tie wire, a U-shaped clamp collar having openings in its sections through which the wire extends, and a wedging key for rigidly securing the outer section of the collar to the wire.

6. A tie bolt for concrete forms comprising a tie wire, a head secured to one end of the wire, a U-shaped clamp collar having slots in its sections through which the opposite end of the wire extends, and a wedging key driven inwardly through the slots of the collar to secure the same in position with the outer section thereof more firmly fixed to the wire than its inner section.

7. A tie bolt for concrete forms and the like comprising a tie wire, a U-shaped clamp collar having openings in its sections through which the wire extends, and a wedging key for rigidly securing the outer section of the collar to-the wire, the tie wire and key being formed of hard steel and the collar of relatively mild steel.

8. A tie bolt for concrete forms, comprising two wires, a U-shaped clamp collar having slots in its sections through which the wires extend, and a wedging key adapted to be driven inwardly through the slots and between the wires to secure the collar in adjusted position with the outer section thereof more firmly fixed to the wires than its inner section.

9. A tie bolt for concrete forms and the like, comprising a tie wire, a clamp collar having a slot through which the wire extends, and a wedging key adapted to be driven inwardly through the slot to secure the collar to the wire, said collar and key having opposed concave seats for engaging the wire, and said key having shallow, outwardly facing teeth extending across its concave seat to prevent the outward movement of the key, the concave wire-engaging seat of the key being otherwise substantially straight throughout its length.

10. A tie for concrete forms comprising a tie rod, clamping collars thereon for resisting outward pressure on the sides of the mold form, one of said collars comprising inner and outer members, and means for applying the strain on the tie to the outer collar member, the latter being spaced from the inner collar member and adapted to yield slightly under heavy loads.

11. A tie for concrete forms and the like, comprising a tie bolt, a U-shaped clamping collar therefor comprising an inner abutment section and an outer yielding section spaced from the inner section, and means for applying the strain on the tie bolt chiefly to the outer yielding section.

12. A tie for concrete forms and the like, comprising a tie member, a U-shaped clamping collar having inner and outer sections spaced apart and having openings through which the tie member extends, and means for applying the strain (m 1,997,638 the tie member chiefly to the outer collar section,.

for applying the strain on the tie rod to the outer collar member, said collar members being relatively yielding to a limited extent lengthwise of the tie and adapted to be forced together and thereby indicate the maximum load to which the tie should be subjected as the concrete is poured.

DAVID HOMER HAYDEN.

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