US904033A - Concrete-mold. - Google Patents

Description

W. B. WELDON.

CONCRETE MOLD.

APPLICATION rum) SEPT. 4, 1901.

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W. B. WELDON.

CONCRETE MOLD.

APPLICATION TILED SEPT.4,190'1.

2 SHEETS-SHEET 2.

Patented Nov. 17, 1908.

IN VENTOR Williamfl. Wcldon A TTORNE Y WILLIAM B. WELDON, OF CHICAGO, ILLINOIS.

CONCRETE-MOLD.

Specification of Letters Patent.

Patented Nov. 17', 1908.

Application filed September 4, 1907. Serial No. 391,350.

To'all whom it may concern:

5 and 4. Although I have illustrated Be it known that I, VVILLIAM B. VVELDON, 9 four such members, it is to be understood a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Concrete Molds, of which the following is a specification.

My invention relates to concrete molds and has particular reference to molds for hollow concrete masonry construction.

The objects of my invention are, to provide an improved collapsible mold for hollow concrete masonry construction such as arches, conduits, sewers and the like, which shall be of great strength and durability and of light construction; to provide a mold as mentioned, which shall occupy a minimum amount of space in the conduit or arch, and which can be readily and quickly collapsed to remove from the masonry when the latter is set, and as quickly expanded and rigidly se cured for further use.

Other objects will appear hereinafter.

With these objects in view my invention consists generally in a shell formed of a plurality of sections extending longitudinally of the device and curved or otherwise shaped to conform to the cross section of the arch or conduit to be formed and a suitable folding frame work made in sections to conform to the sections of the shell and secured thereto, said frame sections being pivotally connected, and means for rigidly fixing said frame members in relation to each other.

My invention further consists in various details of construction and arrangements of parts all as will be hereinafter fully described and particularly pointed out in the claims.

My invention will be more readily understood by reference to the accompanying drawings forming a part of this specification and in which,

Figure 1 is an end view of a concrete mold' embodying my invention in its preferred form, the same being expanded and secured in position for use, Fig. 2 is a similar view illustrating the mold partially folded. Fig. 3 is a section on the line a'a: of Fig. 1 and taken substantially midway of the length of the mold, and Fig. 4 is a detail section, upon an enlarged scale, upon the line g y of Fig. 1.

Referring to the drawings, it will be seen that the shell of the mold is formed of a plurality of parallel longitudinal members,

that any desired number may be used according to the class of work under construction, without departing from the scope of my invention. For convenience of description, I will designate the members 1 and 3 as top and bottom members respectively and the members 2 and a as side members, although it is obvious that their relative position when in use may be reversed. The shell members 1 to 4 are shaped transversely to conform to the cross section of the arch or conduit to be formed. In the drawings, I have illustrated a mold of circular shape.

Each shell member is provided with a plurality of frame members to give rigidity thereto. The frame members extend transversely of the shell members and may be of any desired number according to the length of the mold. and character of work to be done. I find it most convenient for obvious reasons to make the mold comparatively short and provide the same with three frame sections, one at each end and one midway of its length. It is obvious that the shell and the frame members may be formed of any suitable material but I. prefer to make them of metal for various reasons. When formed of metal, as is illustrated in the drawings, the frame members are preferably formed of angle irons.

55 indicate the frame members secured to the shell members 2 and 4; and 66 the frame members secured to the members 1 and 3. The members 5 are substantially equal in length to the width of their respective shell members and are secured thereto by a plurality of rivets or bolts, 7. The frame members, 6, are secured as by bolts or rivets, S to their respective shell members, 1 and 3 and extend beyond the edges of the shell members to overlap the adjacent end of the frame members, The members, 5 and 6 are arranged with their base flanges 5, 6 extending in opposite directions in order that the tension flanges 5", 6 may be readily fastened together as by the bolts, 9, extending through the holes, 10 in the ends of said flanges. To give ample rigidity to the structure without having recourse to cross braces, I provide each joint with two bolts, 9; and to close the cracks between the longitudinal shell members, I provide the battens, 11 secured to the members, 2 and 4 by rivet-s or bolts, 12.

opposite end of said members.

When the device is set up or expanded for use, as illustrated in Fig. 1 it forms a strong rigid mold and the interior thereof is unobstructed except for the comparatively small annular frame work formed of the members, 5 and 6. After the masonry is sufliciently set, the bolt-s, 9 are removed from one end of the frame which supports the top portion, 1 and also the inner bolts, 9 at the This leaves the top portion free to swing inwardly upon the bolts, 9 as a pivot, after which the mold is readily removed.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, a plurality of longitudinal shell members transversely shaped to conform to the arch or conduit to be made, in combination with a plurality of transverse frame members conforming to said shell members and secured thereto, the ends of said frame members upon adjacent shell members being arranged to overlap and having a plurality of registering bolt holes therein, bolts arranged in said holes and longitudinally arranged battens closingthe oints between said shell members when the device is expanded as and for the purpose specified.

2. A mold for concrete construction comprising a plurality of longitudinal shell members transversely shaped to conform to the arch or conduit to be made, in combination with a plurality of transverse frame members conforming to said, shell members and secured thereto, the ends of said frame members upon adjacent shell members being arranged to overlap, a pair of bolts extending through the overlapping ends, one of said bolts constituting a hinge pin upon which the adjacent sections swing and the other constituting a lock to hold the device in extended position, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM B. WELDON.

Witnesses F. E. Si-IEEHY, HELEN F. LILLIs.

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