US1212211A - Adjustable concrete-form. - Google Patents

Description

l. P. HALGREN.

ADJUSTABLE CONCRETE FORM. APPLICATION 'man APR. u. 1916'.

Patented 212m.' 16,1917.

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TED srATEs ATENT OFFICE.

JOHN IP. HALGREN, OF KANSAS CITY, MISSOURI.

ADJUSTABLE CONCRETE-FORM.

Specification of Letters Patent.

Application led April 17, 1916. Serial No. 91,594.

To all whom t may concern:

Be it known that I, JOHN P. HALGREN, a citizen of theY Kansas City, in the county kof Jackson and State of Missouri, have invented certain new and useful Improvements in Adjustable Concrete-Forms, of which the following is a full and exact specification.

This invention relates to improvements inv forms or molding devices designed for use 1n the construction of concrete walls, such as walls for silo bins, tanks, and like structures.

The primary object 1n view 1s to devise a simple, durable and conveniently operatedv design of form of a character adapted to be used in building such walls-in step by step fashion, the form being intermittently elevated in the course of the walls construction. l

It vis afurther object to produce a type of form especially adapted for the construction of bins and a@ like and Which-Win permit convenient variation of the diameter of the form'within'suitable limits according to 'the size of bin desired. It is also sought to sim- Y plify and'improve'generallythe type of apparatus'whereby this particular character of concrete construction is carried out.

Having these general objectsin view the invention will now be described with referf. ence to the accompanying drawing illustrating one form of construction which has been devised for embodying the improvementsin practice, after which those particular features deemed to be novel will be set forth and defined -in the appended claims.

i IV-IV, respectively,

- trating the In the drawing-Figure 1 is a side elevation of a form constructed in accordance with the present improvements; Fig. 2 is a plan view of a portion of the form; Figs. 3 and 4 are sections on the lines III-III and of Fig. 2, being taken 5 is an enlarged perthe band-supporting a plan view, on a reof the molding walls and illusbolt openings whereby the upright members are adjusted to different positions circumferentially of said walls.

eferring lin detail to thefdrawing, the apparatus isjillustrated as comprising a pair on a larger scale; Fig. spective view of one of members; and Fig. 6 is duced scale,

United States, residing at of molding walls, 2, 2, arranged in spaced relation and provided with a series of channel upright members 4, spaced at equal intervals around the form. The molding walls 2 are constructed of any suitable flexible material, such as sheet metal of appropriate gage, thus permitting the same to assume the cylindrical-form illustrated, and allowing the ends thereof to be overlapped more or yless in varying the size of the form yfor molding bins of different diameters. For this purpose the ends of the molding walls 2 are provided with the series of bolt openings 6, spaced apart the required distance to give the desired variation in diameter, and bolts 8 being used to secure the ends of each molding wall together.

The channel upright members 4 Vare arranged in pairs and secured by bolts 9 to the inner and outer faces of the molding walls, said bolts passing through openings 10 in said walls, these. openings 10 in each set being arranged the proper distance apart for permitting the uprights to be spaced at equal intervalsV around the form when the latter is expanded or contracted to different diameters; c'. e., the distance between the openings of each set gradually varies, being greater between the openings at the ends of the mold walls 2 than between the openings of the intermediate sets, as illustrated in Fig. 6, since the intermediate uprights require less adjustment of position than the remaining uprights for maintaining their equidistant relation. Each upright member 4 also carries by means of the bolts 9 a pair of slightly curved channel pieces 12, the passages through which are of lT-sha'pe in crossprovided with a series ef bolt openings 22 for the bolts .24 for the rib portions 18 by pouring the concrete rights 4, and the channelpassage through the members 12 is of suincient diameter ('see Fig` 4) to provide the requisite clearance for j permitting such relative lateral play of the ends of the sections 14 as will occur in malg-- ing this adjustment for slightly varying diameters of the form.

The upright members 4 project above the upper margins of the molding walls 2, where they are provided with the bolts 28 and' channel pieces 30 or equivalent spacing constructiomand for attachment of such jack'- ing mechanism as may be used for raising and lowering the form as` operated. Any suitable cross-bracing for the interior` of the form may be provided for large diameters; but neither this interior bracing nor the jacking mechanism are illustrated, since the same form no part of the present invention.

The manner of adjusting the form and the mode of use of the same will be apparent from the foregoing. In changing the form to a slightly different diameter, the sections 14 at the over-lapping ends of the walls 2 are unbolted at one end and the bolts 8 shifted to the proper openings 6 to give the required diameter of form; the uprights 4'4 being of course also shiftedto the proper bolt openings 10 to equalize the intervals between said uprights, and necessitating a corresponding adjustment telescopically of the ends of the various band sections within the band supporting pieces 12. Having adjusted the parts to the desired diameter of form, the molding operation is carried on between the mold walls 2, the form being gradually elevated by any approved type of jacking means step bystep, as the concrete construction is built up." f

It will thus be apparent that a' simple, strong and rigid form construction isoprovided for carrying out the desired objects of` the invention, andV that the same may be readily and conveniently assembled and adjusted Within the limits provided for, and

A iications as may fairly fall within the scope whilethe foregoing represents what is now deemed to constitute the preferred form of embodiment ofthe improvements, the right is reserved to such formal changes and modiof the appended claims.

1. In a concrete form construction, the combination of a pair of spaced molding walls adapted to be expanded or contracted to various diameters, a series of uprights adjustable horizontally along the inner. and outer` faces of said walls and provided with means forsecu'ring said uprights thereto in diderent horizontal positions for diderent diameters of forms, and band members arranged in circumferentially adjustable sections conforming to said inner and outer faces and secured to said uprights. 2,. Ina concretewform construction, the combination of a p'air of spaced molding walls of flexible material adapted to be expanded or contracted to various diameters of form, a series of uprights provided with means for securing the same to' said mold mg along the latter, band members arranged 1n sections conforming to the inner and *outer facesv ofV said molding walls and adjustable circumferentially with reference to said walls, and means for adjustably securing said band sections to' said uprights.

3. In a concrete combination of a pair of spaced molding walls, a series of uprights adjustable horizontally along the inner and outer faces of said walls, band members arranged in sections extending between said uprights and conforming to said inner and outer faces, and band supporting members carried` by said uprights and having adjustable connection with the adjoining ends of said band sections. j

4. In a concrete form construction, the combinationrof a pair of spaced molding walls' adapted to be expanded or contracted to different diameters, a` series of uprights provided with connections for securing the same tothe inner and outer faces of said walls and at different points circumferentially thereof, band members arranged in sections extending .between said uprights and conforming to said inner and outer faces, and bandv supporting members carried by said uprights and having adjustable telescopic connection with the adjoining ends of said band sections. n j o 5; In a concrete form construction, the combination of a pair of spaced molding walls adapted to be expanded or contracted to different diameters of form, a series of uprightsprovided with connections for securing the same to the inner youter faces of said walls and at different points circumferentially thereof, band members of shaped cross-section arranged in sections extending between said uprights and conforming to said inner and outer faces, and band supporting channel members carried by said uprights and formed to slidingly receive the adjoining ends of said band sections and proidedV with adjustable connections therewit 6. In a concrete form construction, the

form construction, the

combination `of a pair of spaced molding of said Walls and at different points circumferentially thereof, band members arranged in sections extending between said uprights and conforming to said inner and outer faces, and band supporting channel members carried by said uprights and having adjust# able telescoping connection With the adjoining ends of said band sections, said channel members being formed to permit slight relative lateral movement of the ends of Said 10 sections as the uprights are shifted to different positions.

JOHN P. HALGREN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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