US2475890A

US2475890A - Formwork for molding concrete columns and the like

Info

Publication number: US2475890A
Application number: US694763A
Authority: US
Inventors: Hamilton William
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-06-11
Filing date: 1946-09-04
Publication date: 1949-07-12
Anticipated expiration: 1966-07-12

Description

Jul 12, 1949. w. HAMILTON 4 FORMWORK FOR MOLDING CONCRETE COLUMNS AND THE LIKE Filed Sept. 4, 1946 3v Sheets-Sheet 1 10 10 J F 1 16 F 4:9

15 mm JI v llvv euro i B46 02%, 4 1,, MY cum W. HAMILTON July 12, 1949.

FORMWORK FOR MOLDING CONCRETE COLUMNS AND THE LIKE Filed Sept. 4, 1946 3 Sheets-Sheet 2 INKCNTOR MMVLUM w. HAMILTON 2,475,890

FORMWORK'FOR MOLDING CONCRETE COLUMNS AND THE LIKE July 12, 1949.

:5 Shets-Sheet 5 Filed Sept. 4, 1946 QUI INVfiNTOQ waL MMY fi Patented July 12, 1949 FGRMWURK 'FOR MOLDING GGNCRETE COLUIWNS AND LIKE WilliamHamilton, Frimley Green, England Application September 4, 1946, Serial No. 6943763 In Great Britain lune' 11,"194'5 Section 1, Public Law 690, August 8,1946 Patent expires June 11, 196'5 This invention relates to 'formwork or shutterin such as is used for casting-in situ concrete and like structures and has for its objectto provide formwork for the casting of columns, a particular object ofthe invention being to provide standardised parts which enable a variety of sizes of column to be cast, and which shall provide for the simple erection and assembly of the formwork, whilst ensuring that all the parts are firmly secured together when in use.

According to this invention, a formwork for moulding concrete and like columns comprises external angle-pieces arranged at the corners of the formwork, the limbs of each of which anglepieces-areeach provided with one or more toothed external ledges extending towards an adjacent corner, one or more toothed locking bars extending across each side of the formwork and each engaging a toothed ledge on each .of two anglepieces, and panels each side of the formwork retained between two of said angle-pieces.

Internal angled fillets maybe arranged to be supported in .spaced relationship with said external angle-pieces so as to clamp between them the edgesof said panels.

A number of angle-pieces may be arranged end to-end, which ends .are provided with co-operating lugs and sockets..whereby the angle-pieces are aligned.

A number of panels on each side of the formwork may be arranged one above the other, and opposite edges of said panels may be recessed so that adjacent panels may overlap one another While maintaining their faces in alignment.

The aforesaid angle-pieces may be provided with projections overlying said ledges and removable locking means may be arranged for insertion between said projections and locking bars for maintaining said locking bars in engagement with the toothed ledges.

The aforesaid angled fillets may be each secured to their co-operating external angle-pieces by bolts arranged diagonally through their respective angles to provide for the simultaneous clamping of panels against both limbs of the angle-pieces.

The aforesaid panels may comprise a metal frame surrounding a sheet of plywood or the like. The following is a description of one embodiment of the invention as applied to a formwork for casting a solid column, reference being made to the accompanying drawings in which:

Figure 1 is a side elevation of the general assemblage,

Figure 2 is an enlarged side View of a portion of two angle-pieces arranged end to end showing a locking bar assembled with one of the ledges,

Figure 3 is a section on the line 3-3 ofFigureZ,

Figure 4 is a section onthe line '4-4 of Figure 2,

Figure 5 is a face view of one'of'the panels and Figure 6 is a section on the line -6-6 of 'Fi ure 5.

It will be assumed, for the sake of clarity, that the column is vertical and the formwork will be described in this setting. The external anglepieces, are constituted by aluminium angles it which maybe, for example, of the order of 6 -feet in height and they are provided-on the outside at each end with lugs H which overlap the outside of the end of an adjacent angle-iron, thereby ensuring accurate alignment and rigid connection between the angle-iron. On the outer faces of each angle-piece there are formed a number of ledges 12 which are spaced apart lengthwise at suitable positions, and these ledges-are "toothed or serrated at 13, for example, with rectangular grooves, which may be about inch wide and of an inch deep, spaced A; inch apart. Each of these toothed surfaces has an overlying ledge l4 facing and spacedaway from it, the two ledges l2 and 14, for example, constituting a pocketand they are disposed at their length transverse to the "length of the angle-pieces. Toothed locking bars [5 which are shaped to engage with the toothed ledges are provided, and these may be of a length of the order of 2 feet 6 inches, and they can be adjustably engaged towards each end with two angle-pieces I0 to space them apart by any desired distance, and also to hold them rigidly when they are spaced by the interengagement of the bars with the teeth. When the looking bars have been assembled in place, they are securely retained therein by means of wedging pieces l6 which are inserted between the bar and the ledge opposite to the toothed ledge so as to hold the locking bar against displacement; these wedging pieces are conveniently made in the form of U-shaped clips which engage the outer surface of the untoothed ledge l4, and means may be provided for retaining them in place, for example, by a pin passing through holes I1 in the limbs of the clip and ledge I4.

011 the outer corner of the angle-piece there are provided bosses I8 spaced at convenient points along the length, and these bosses are drilled so that the centre line of the whole bisects the angle between the two limbs of the angle-pieces to permit the insertion of a bolt [9 there-through, the threaded end of the bolt extending outside the anglepiece to receive a butterfly nut (not shown) screwed down onto the boss.

Angled fillets 20 are used with each of the angle-pieces and are preferably made of a light metal alloy, and are curved at 2| on their inner faces to a suitable curvature which will constitute the mould for the corner of the concrete column, and these fillets are secured in place by the diagonal bolts l9 aforesaid which are screwed into the fillet at the corner thereof at 22 so that the external surfaces of the fillet when thus assembled are parallel with the internal surfaces of the angle-piece.

There are also provided panels 23 to fill the gap between two angle-pieces when spaced apart, and these panels are of rectangular oblong form. Their dimensions are so chosen as to provide a suitable range by setting the panels with their long edges either vertical or horizontal; thus, for example, the panels may be 8 inches in width and 11 inches in length. The edges of these panels are gripped between the angled fillet 20 and the angle-piece l0, and these latter are made of such dimensions as to allow a tolerance of, say, 1 or 2 inches in the depth to which the panel is inserted between them. When the panels are inserted with their length vertically, that is to say their dimensions of 8 inches between two anglepieces, and there is a tolerance of 1 inches on each angle-piece, a column of 8 inches in width can be formed, or by utilising the 1 inch tolerance on each angle-piece any other dimension up to 11 inches in width can be achieved. A further range of width from 11 inches to 14 inches can be obtained by inserting the panels with their length between the angle-pieces so that any width of column from, say, 9 inches to 15 inches can be obtained with the one set of parts as above described.

The same angle-pieces can be used for larger columns by providing an alternative set of panels of which the dimensions may be of the order of 14 inches by 17 inches, thereby enabling columns of width up to 21 inches to be formed.

In order to provide a rigidity for the different panels when assembled in the angle-pieces, the panels are formed with metal frames 24, preferably a light alloy with a plywood filling, and the 4 metal frames on opposite sides of the panel are recessed at 25 from opposite faces of the panel so that when two panels are assembled one above the other their edges interlock and ensure a rigid and truly aligned surface for the mould.

Scaffolding, such as tubular scaffolding, may be used for holding the column in position, and the concrete is poured into the formwork from the top of the column. The assembly permits vibration of the concrete and this may be effected by any suitable attachment.

It will be seen that this invention provides a standardized set of parts for the formwork which includes a wide variety of work to be done and that the erection and dismantling are very simple, quick and cheap, thereby considerably expediting the work.

I claim:

A formwork for moulding concrete and like columns comprising external angle-pieces arranged at the corners of the formwork so as to extend along the height thereof the limbs of each of which angle-pieces has fixed thereto one or more toothed external ledges extending towards an adjacent corner, and a projection overlying and spaced away from said ledge, one or more locking bars toothed at both ends and extending across each side of the formwork and each engaging the toothed ledges on each of two anglepieces and locking means inserted between each said overlying projection and the locking bar beneath it, and panels on each side of the formwork retained between two of said angle-pieces and unattached to said locking bars.

WILLIAM HAMILTON.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 975,615 Hanneman Nov. 15, 1910 1,318,427 Yamaguchi Oct. 14, 1919 1,670,338 Butterworth May 22, 1928 1,871,919 Schubert Aug. 16, 1932 1,936,666 Hall Nov. 28, 1933 2,206,493 Whatting July 2, 1940