US2674284A - Cam actuated concrete form clamp - Google Patents

Description

April 6, 1954 P. N. SITTON 2,674,284

CAM ACTUATED CONCRETE FORM CLAMP Filed Jan. 11, 1951 INVENTOR PHILIP N. SITTON I BY 1 h 45 ATTORNEYS F I G- 4 Patented Apr. 6, 1954 UNITED STATES PATENT OFFICE CAM ACTUATEl) CONCRETE FORM CLAMP Philip N. Sitton, Dayton, Ohio Application January 11, 1951, Serial No. 205,543

3 Claims. 1

This invention relates to fastening devices adapted for use in securing together sectional forms that are particularly adapted for use in connection with the pouring of semi-fluid substances such as concrete in the building of various structures.

The invention is particularly adaptable for use in connection with sectional forms that are used for the manufacture of concrete septic tanks, it being the purpose of the use of the invention to removably attach together form sections so that they may readily be disengaged from a concrete wall after it has set. While the invention will be particularly described with reference to the use of sectional forms adapted for the manufacture of concrete septic tanks, yet it will be understood that the fastening device can be used in connection with other types of sectional forms to secure together adjacent form sections.

An object of the invention is to provide a fastening device that is readily removable from form sections to permit release and removal of form sections relative to one another and which is readily replaceable into the form sections when in their selected position to releasably hold the sections together.

It is another object of the invention to provide a fastening device of the kind referred to in the foregoing object wherein the device locks itself in position for securing form sections together.

It is another object of the invention to provide a fastening device in accordance with the foregoing objects wherein the device is adjustable to correct for wear in the device or to provide for correction between spaced elements on the form sections that cooperate with the fastening device in the event the spaced elements are bent out of normal position.

It is a further object of the invention to pro vide a fastening device that will have the features of the foregoing objects wherein the device is simple and inexpensive to construct.

It is another object of the invention to provide a fastening device that is completely removable from form sections that are releasably held together by the fastening devices to thereby eliminate loose fastening connections on any part of the form sections which would readily become damaged in handling of the form sections.

Another object of the invention is to provide apparatus for releasably connecting form sections and concurrently aligning the edges of the form sections relative to each other upon securing the form sections together with fastening 2 devices that are releasable from the form sections.

Further objects and advantages will become apparent from the drawings and the following description:

Figure l is a perspective and elevational View of a portion of a form composed of form sections adapted for the manufacture of a concrete septic tank.

Figure 2 is a perspective elevational view of a portion of the form illustrated in Figure 1 with the fastening device of this invention shown in cooperation therewith.

Figure 3 is a front'elevational view of a fastening device of this invention illustrated in cooperation with form sections.

Figure 4 is a cross sectional view taken substantially along line 4-4 of Figure 3.

In Figure 1 there is illustrated a sectional form adapted for the manufacture of a concrete septic tank. The sectional form consists of an inner form wall it that comprises the form sections H and I2, each form section II and I2 forming one-fourth of the periphery of the inner wall of an elliptical septic tank wall.

An outer form wall it is spaced from the inner form wall It to provide for a uniformly spaced area i3 between the form walls Hi and H into which concrete can be poured to form the wall of a concrete septic tank.

The outer form wall I5 is composed of form sections l5 and H. These sections iii and I! each form one-half of the outer periphery of the wall of the elliptical septic tank.

The form sections H and i2 are separated at the juncture 18, while the outer form walls Iii and I! are separated along the juncture l 9. The form sections H, I2 and I6, I! can, therefore, be separated and removed from a concrete wall poured in the space 13 provided between the form walls i0 and l 5 for removal of the sectional form walls from the formed product when the concrete has set sufiiciently.

The form sections H, l2 and 56, H are releasably held together by fastening devices that are more particularly illustrated in Figures 2, 3 and 4. While the fastening devices are illustrated as releasably securing the form sections it and i1, yet it will be understood that the same kind of fastening device can be used to hold the form sections II and S2 in their secured position.

The form sections it and I! are each provided with a vertically positioned angle iron member 20 and 2| respectively that extends along the edges 22 and 23 of the respective form sections l6 and I1, the edges 22 and 23 forming the parting juncture |9 between the form sections I6 and H. A plurality of fastening devices 25 extend between the angle iron members 20 and 2|, as illustrated in Figure 1; these fastening devices 25 being completely releasable from the angle iron members 20 and 2| when it is desired to separate the form sections I6 and IT.

The angle iron member 20 is provided with a slot 26 extending inwardly from the edge of the web 21 that is positioned vertically to the form section I6. Similarly, the angle iron member 2| has a slot 28 extending inwardly from the web 29 that is at right angles to the form section H. The slots 26 and 28 are in substantial planar alignment.

Reinforcing members 30 and 3| are placed at each side of the slot 26 and extend between the web 21 and the web 32 of the angle iron member 20. Similarly, reinforcing members 33 and 34 extend between the web 29 and the web 35 of the angle iron member 2|, the reinforcing members 33 and 34 being positioned at opposite sides of the slot 28 in the web 29.

Each of the fastening devices 25 consists of a rod 35 that has a threaded end 36 on one end thereof and an eye 31 on the opposite end thereof. The threaded end 36 is adapted to receive the pair of locking nuts 38 and 38 and the washer 40.

The eye 3'! of the rod 35 fits within the forked yoke 4| that terminates in a handle 42. A bolt 43 extends across the forked yoke 4| and through the eye 31 of the rod 35, whereby the rod is pivoted within the forked yoke 4| at one end of the handle 42. A nut 44 holds the bolt 43 in the forked yoke 4|. The forked yoke 4| is provided with a cam element 45 on each of the forks Ma and 4H) that is adapted to engage the web 28 of the angle iron member 2| when the fastening device 25 is in position between the angle iron members 20 and 2| as illustrated in the drawings.

When the fastening device 25 is in locking position holding the form sections l6 and I1 together, as illustrated in the drawings, the cam elements 45 are positioned outwardly of a line Y extending between the pivot axis of the eye 31 and the engagement of the opposite end of the rod 35 with the web 21 of the angle iron member 28, thereby urging the handle 42 in a counter-clockwise direction holding the heel 46 on the handle 42 against the form section I! and thereby locking the fastening device 25 against opening thereof.

An aligning guide 58 is secured to the angle iron member 2| so that the edge of the guide 58 is parallel to the wall of the form section l5. Similarly, an aligning guide 52 is secured to the angle member 2| with the edge 53 parallel to the wall of the form section Thus, when the form sections l6 and I! are positioned adjacent each other, the aligning guide 58 engages the edge of the angle member 2|, while the aligning guide 52 engages the edge of the angle member 20, the two members 58 and 52 crossing in the form of the letter X so that the edges 22 and 23 of the form sections l6 and H are brought into immediate engagement. As many of the cooperating aligning members 58 and 52 as desired may be placed along the angle members 20 and 2| to obtain proper edge alignment between the form sections I6 and I1.

In-use, the form sections "5 and I! are first placed in the position illustrated in Figure 1. The fastening devices 25 are then placed with the rod in the slots 26 and 28 of the angle iron members 20 and 2| respectively with the washer 48 against the member 20 and the cam element against the angle iron member 2|. The lock nuts 38 and 39 are rotated to adjust the length of the rod 35 to cause a meeting of the edges 22 and 23 of the form sections l6 and I! when the handle 42 is rotated in a counterclockwise direction to place it in the position illustrated in Figure 4 to lock together the form sections l6 and I1.

As the form sections l6 and H are drawn together into their locked position, the aligning members and 52 position the edges 22 and 23 of the form sections l6 and I! in proper edge alignment.

To release the fastening device 25, the handle 42 is rotated in a clockwise direction, thereby allowing the rod 35 to be removed from the slots 26 and 28. The form sections l6 and I! can thereafter be separated.

While the apparatus disclosed and described herein illustrates a preferred form of the invention, yet the apparatus is capable of mechanical alteration without departing from the spirit of the invention, and all modifications that fall within the scope of the appended claims are intended to be included herein.

What I claim is:

1. In a concrete wall form having a plurality of wall sections in angularly disposed relationship to each other around the periphery of said form, a fastening device for connecting a pairof said sections together along their edges com prising an angle iron member vertically positioned along each of said edges, transverse slot means in each of said angle members and an arcuate rod removably positioned in said slot means, said rod having a threaded portion on one end receiving nut means for frictional engagement with one of said angle iron members, an eye on the opposite end of said rod, a cam element rotatably mounted on said rod with pivot means extending through said eye, said cam element engaging the other angle iron and its associated wall section, a handle on said cam element for connecting and disconnecting said wall sections, said handle lying substantially against the adjacent wall sections in said connecting position.

2. In a concrete wall form having a pair of wall sections disposed at an angle relative to each other, means for connecting said sections together along their adjacent edges comprising angle iron members positioned along each of said edges, slot means in each of said members and a rod removably positioned in said slot means, said rod having a threaded portion on one end thereof and receiving a nut means for frictional engagement with one of said angle members, an eye on the opposite end of said rod, a cam element rotatably mounted on said rod with pivot means extending through said eye, said cam element engaging the other angle iron and its associated wall section, a handle on said cam element for connecting and disconnecting said wall sections, each of said angle members having a guide member secured thereto, said guide members lying in flat engagement with one another when said handle is in its connecting position.

3. In a concrete wall form having a pair of angularly disposed wall sections with abutting vertical edges, L-shaped support members extending along each of said edges, each L-shaped support member having one leg secured to the wall section adiacent the edge thereof, slot means disposed in the other leg of each of said L-shaped support members said slots being disposed in planar alignment, 9. rod removably positioned in said slot means, one end of said rod having means for frictionally engaging one of said support members, the other end of said rod having a camming means thereon for connecting and disconnecting said sections, and a means for aligning said edges comprising a flat bar extending from each of said support members, said bars lying in engagement when said camming means is in its connecting position.

References Cited in the file of this patent UNITED STATES PATENTS Number Number Number Name Date Holmes Dec. 7, 1897 Herrick Aug. 27, 1907 Markham Nov. 17, 1908 McHugh Nov. 8, 1910 Trimble Aug. 8, 1911 Smith May 18, 1915 Giduz May 29, 1917 Wotnoske Oct. 24, 1933 Anthony Aug. 8, 1950 FOREIGN PATENTS Country Date Great Britain Mar. 18, 1911

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