US3825220A

US3825220A - Concrete form work joint members

Info

Publication number: US3825220A
Application number: US00304506A
Authority: US
Inventors: E Schmaltz
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-11-07
Filing date: 1972-11-07
Publication date: 1974-07-23
Anticipated expiration: 1991-07-23

Abstract

A removable form for moulding concrete has mortice and tenon type joints permitting adjacent forms to be arranged in a selected one of a three-way relation, with locking bars to secure the joints having a cam lock to retain the locking bar in place. The joints provide a substantially impermeable pouring face, and the locking bar carries a protective loose piece to seal the cam lock against pouring splash.

Description

- 1 States Patent 1191 Schmaltz 1111 3,825,220 1451 July 23,1974

[54] CONCRETE FORM WORK JOINT MEMBERS [76] Inventor: Edwin Schmaltz, 46 Nordale Cres.,

Toronoto 15, Ontario, Canada 22 Filed: Nov. 7, 1972 [21] Appl. No.: 304,506

52 vs. c1. 249/194 51 1111.0. E04g 11/08 [58] Field 61 Search 249/6, 9,47,48, 49, 192, 249/194. 195, 219 R; 16/128 R; 52/285, 585, 586, 583

[56] References Cited UNITED STATES PATENTS 726,649 4/1903 Craine 52/586 X 1,557,523 10/1925 Hahn 52/583 X 2,704,390

3/1955 Hummel 249/214 X 2,845,150 7/1958 McBerty 52/586 X 3,025,640 3/1962 Muhr 52/585 X 3,288,427 11/1966 Pluckebaum 249/17 X 3,511,004 5/1970 Snellings 52/582 X 3,547,397 l2/l970 Brow 249/219 R Primary Examiner-J. Spencer Overholser Assistant Examiner.lohn S. Brown Attorney, Agent, or Firm-George H. Riches [5 7] ABSTRACT A removable form for moulding concrete has mortice and tenon type joints permitting adjacent forms to be arranged in a selected one of a three-way relation, with locking, bars to secure the joints having a cam lock to retain the locking bar in place. The joints provide a substantially impermeable pouring face, and the locking bar carries a protective loose piece to seal the cam lock against pouring splash.

1 Claim, 12 Drawing Figures BACKGROUND OF THE INVENTION This invention is directed to a knock-down joint and in particular to a joint formulation for use with concrete forms.

In the construction industry the pouring of concrete into moulds is greatly facilitated where prefabricated form structures may be used that permit rapid assembly and disassembly of the forms, while providing flush surfaces substantially impermeable to penetration of the concrete and requiring no false pieces to protect the form.

An object of the present invention is to provide a simple, robust joint structure of the mortice and tenon type to permit three-way assembly of forms.

A further object of the present invention is to provide a joint structure that is flush surfaced in an assembled condition to be substantially impermeable to the penetration of concrete therein. 2

A further object of the present invention is the provision of locking bar means to secure the joint members in assembled relation, and adaptable to permit assembly of forms in superposed stacked relation.

A further object of the invention is the provision of a cam locking device to retain a locking bar means in assembled relation with the form joint members and to preclude inadvertant withdrawal of the locking bar or the inclusion of concrete into the cam locking device.

SUMMARY OF THE INVENTION Broadly, the invention thus provides a removable form wall joint to provide a flush surfaced substantially concrete impermeable joint construction for a concrete formwork, comprising first and second joint members each having a joint portion and at least one attachment portion extending therefrom to receive a plate member in attached relation thereto, the joint portions of the members co-operating when overlapped in mortice and tenon relation to provide flush surfaced interdigitated close meshing relation, symetrically located internal recess walls extending within the joint portions about a common axis to define in the assembled condition a substantially continuous passage to receive locking bar means in sliding relation therein, to secure the joint locked in the selected relation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is a general view in perspective of an assembled joint in an aligned configuration;

' FIG. 3 is an exploded view of the joint membersof FIG. 2 in an angled configuration;

FIG. 4 is a sectional elevation at 44 of FIG. 2. FIGS. 5, 6 and 7 are sectional views taken on the lines 5-5, 66, and 7-7 respectively of FIG. 4.

FIG. 8 is a general view in'perspective of a form of a reinforcing clip for adjacent wall sections.

FIG. 9 is a perspective view of a reinforcing clip for use in connecting superposed forming sections.

FIG. 10 is a fragmentary view in end elevation taken on the line 10-10 of FIG. 9 showing a complement of forming plates in position therein.

FIG. 11 is a fragmentary vertical sectional view through a modified form of hinge structure of FIG. 2, showing a modified form of locking bar.

FIG. 12 is a cross sectional view of the modified structure of FIG. 11, taken on the line l2 12 thereof.

' DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. 1, 2 and 3, the joint assembly comprising a male half 12 and a female half 14 is shown in a variety of assembled relationships. At Z there is shown a joint assembly 10 wherein the

joint members

12, 14 are arranged in aligned relation. At the location 3 the

members

12 and 14 are at right-angles in the same sense, but having opposing surfaces adjacent the concrete. At the location Z there is shown two pairs of assembled joints in superposed relation, while at Z intermediate the plate ends there is shown the use of plate reinforcing clips 17 to secure

outer form plates

16, 16 and

inner form plates

18, 18 in stable superposed relation. Also intermediate the joints 10 is shown tie bars 20 to preclude the bowing of the

plates

16 and 18 under static pressure of poured concrete.

Referring more particularly to FIGS. 3, the joint assembly 10 has a male half 12 and a female half 14, with a tenon'portion 22 having a square plan section and matching mortice recess defined by walls 24.

Each

joint portion

12, 14 has a pair of

attachment portions

26, 28 in parallel relation to receive the ends of

plates

16 or 18 in secured relation therein. While the

plates

16 or 18 are illustrated as being wood construction such as "A inch plywood, it will be understood that light-weight materials such as metal plates or foam cored composite plates may also be used.

A centrally located recess 15 receives a locking bar 25 in sliding locking relation, to secure the two

halves

12, 14 of the joint in locked relation, both to preclude transverse withdrawal of the tenon 22 from the mortice 24 and to prevent selective rotation of the

halves

12, 14 considered in a plan view, by abutting relation of

adjacent surfaces

32, 34 and 36, 38 in FIGS. 5 and 6.

When assembled as a right angled configuration similar to locations at Z of FIG. 1, the abutting surfaces are changed, but the assured non-rotational relationship issimilarly preserved.

The locking pin or bar 25 has a loose piece or collar 35 and a fixed cam portion 37. Shaped top and

bottom recesses

47 and 57 in the joint member 14 permit insertion of the cam portion 37, beneath a retaining tongue 60, upon insertion of the bar 25. Rotation of the bar 25 about its axis through using handle portion 27 both as a turning means and as a cam position indicator locates the cam 37 beneath the tongue 60.

While the rigidity of the joint tends to keep the form plate members l6, 18 in a desired aligned relation, the

tie bars 20 help overcome the tendency of the plates to bulge under the hydraulic forces of poured concrete. In the case of superposed plates, as at the position 22, the clip 17 has leg portion 67 to hold adjacentplate edges 76 in aligned superposed relation.

In the case of the joint assembly at location Z the use of an elongated locking bar 25 serves to hold the superposed joints 10 in aligned locked relation. It is apparent that the bar 25 may extend downwardly beneath the joint assembly in the inserted position to support the entire structure in a slightly raised position above the ground or other surface above which it is located. In fact, the elevation may be adjusted for a given length of bar 25 to level the

plates

16, 18 by driving the bottom end of the bar 25 into the ground a desired amount.

The loose piece 35 mounted on the bar 25 precludes the accidental entry of dirt, particles or concrete splashings into the cam aperture.

in FIGS. 11 and 12 a modified form of means for securing

sections

12 and 14 of a hinge joint in locked relation to each other is shown.

In this modification the hinge section 14 has in each end face a recess 72 of considerably greater plan area than the diameter of a locking bar 75 which is adapted to pass through said recess and extend completely through the associated tenon 22 of the hinge part 12 and into the mortice part 24 of the hinge part 14. The recess 72 extends but a short distance into the section 14 and its bottom wall is of greater diameter than the locking bar body to provide a ledge 77 around, or at least partly around, the locking bar passage and the locking bar has a pin 73 extending laterally therefrom which in the inward movement of the said locking bar will engage said ledge and thus limit the inward movement of the locking bar to the required extent.

The section 14 may, if desired, have an inwardly extending rim 77 extending partly around its top edge which will prevent outward withdrawal of the locking bar when the latter has been rotated to bring the pin 73 into a position below said rim.

This invention has many and varied uses, particularly in the construction field, which greatly contributes to the speedy and efficient erection of structures requiring the pouring of concrete. Among the uses to which the instant invention may be used to advantage are: the formation of corners of building; the construction of piles and other underwater structures; and construction of edging for flower plots; and many other uses requiring the pouring of concrete.

What I claim is:

l. A removable form wall joint to provide flush surfaced substantially joint construction for concrete formwork, comprising: first and second joint members each having a joint portion and at least one attachment portion extending therefrom to receive a plate member in attached relation thereto, said joint portions of said members co-operating in overlapping mortice and tenon relation to provide flush surfaced interdigitated meshing relation between said joint portions when assembled in selected predetermined angular relation, symetrically located internal recess walls within said joint structure portions extending about a common axis to define in said assembled condition a substantially continuous passage to receive locking bar means in sliding relation therein to secure said joint locked in said predetermined relation, and cam locking means adapted to retain said locking bar in inserted relation in said joint.

Claims

1. A removable form wall joint to provide flush surfaced substantially joint construction for concrete formwork, comprising: first and second joint members each having a joint portion and at least one attachment portion extending therefrom to receive a plate member in attached relation thereto, said joint portions of said members co-operating in overlapping mortice and tenon relation to provide flush surfaced interdigitated meshing relation between said joint portions when assembled in selected predetermined angular relation, symetrically located internal recess walls within said joint structure portions extending about a common axis to define in said assembled condition a substantially continuous passage to receive locking bar means in sliding relation therein to secure said joint locked in said predetermined relation, and cam locking means adapted to retain said locking bar in inserted relation in said joint.