US1675749A

US1675749A - Form for concrete

Info

Publication number: US1675749A
Application number: US178302A
Authority: US
Inventors: Crawford Prestonm
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-03-25
Filing date: 1927-03-25
Publication date: 1928-07-03
Anticipated expiration: 1945-07-03

Description

July 3, 1928. 1,675,749

. I P. M. CRAWFORD FORM FOR CONCRETE Filed March 25, 1927 Ill I [/2 I 1 3 {I 11 5 4 7, 14 44 L H g KIT/v p uni-m STAUTE'HS;

Patented July 3, 1928.

PATENT OFFICE.

masses m. caawronn, or rir'rsnoadn, rnnnsrnvama.

FQE concerns.

7 Application filed'jM arch 25, 1927. SeriaiNc. 178,802.

This invention relates to forms used for making concrete structures and more in; particular to metallic forms for concrete beams.

The primary object of this invention is to provide means whereby the forms for easting concrete beams may be easily connected and secured to the forms for the concrete columns by which said beams are to be supported.

Another object of this invention is the provision of metallic concrete 7 forms for beams which are strong and durable and which, owing to the smoothness of the material used, will produce concrete casts of finished appearance.

A further object is to provide beamforms which may be easily removed after the concrete has hardened and in which the component parts thereof may be used indefinitely. Additional features and advantages of this invention will appear from the following description considered in connection with the accompanying drawing forming a part of this application, and in which:

Fig. 1 is a perspective view showing a form for a concrete beam used in connection with a form for a concrete column and supported by a shore-post ofthe adjustable type. a

Fig. 2 is an enlarged perspective view of a column-form shown in Fig. 1.

Fig. 3 is a fragmentary perspective view showing one end ortion of a form for a concrete beam, bui t according to this invention.

Fig. 4 is a fragmentary perspective view of the bottom plate of the beam-form.

Fig. 5 is a fragmentary view showing the method of connecting the clamps of the column-form at the corners of said form.

In Fig. 1 I have shown m invention as used in connection with a co umn-form intended for molding a square concrete column, the four sides of this form being preferably built up of more than one plate, such as the plates 1 and 2. These plates are held in proper alinement by means of angle iron clamps 3 which are removably secured to the plates by means of bolts 4 having preferably conic heads adapted to fit countersunk'holes drilled in the plates, so as to leave the interior of the form quite smooth. The clamps are disposed on the form in such a manner that the horizontal flange of one clamp will contact with the horizontal flanges of the two adjacent rectangularly disposed clamps, as plainly shown in the drawing.

The four sides of the form are firmly held together by securin these clamps at the four corners of the Eorm by means of bolts 5 inserted through registering holes 6 suitably located on the horizontal flanges of said clam s. If desired, the plates may be additiona ly bound together by means of the hinged cleat and pin connections 7 disposed intermediate the angle-clamps.

The form for a concrete. beam comprises two side Walls 8 of suitable height and a bottom made of two plates 9 and 10. This beam-form is furthermore characterized by the fact that its length is made up of two parts, the long part 11 corres onding to the minimum span of standard short part 11" bein of such length as to make up for the di erence in longer spans.

The sides and the bottom of the beamform are secured together by means of' the angle iron stiffeners 12, the ties 13 and the 7 bolts 14 having conic heads to insure smooth surfaces inside the form. Bolts 15, inserted through holes 15 in the ties, are used to secure the stifleners and ties together.

The long and short portions of the beamform are preferably united together in the manner shown especially in Fig. 3. As shown therein, at both ends of the long side plates are permanently secured the short angles 16 having one flange flush with the end of the form. A channel tie 17 is removabl bolted to the bottom plates and the side sti eners 18 are secured to the side-plates 8 by means of the bolts 48 and to the inner flange of the channel 17 by the bolts 49. Similarly, at the corresponding end of the short section, short angles 19 are permanently secured to the sides 8 and an angle iron tie 20 is removably secured to the bottom plates. Both sections are connected together by bolting together the short angles 16, 19 and the

ties

17 and 20.

To secure the short beam section to the column-form, I make use of the auxiliary channel-shaped spacers 21 and the short angles 22. The former are first secured on the column-form by means of cone-headed bolts inserted in suitable holes 23 provided in the column-form and in the outer flange of the channel-spacers; the beam-form is then connected to the column-form by bolting the short angles 22 to said spacers. The

ams and the reason for using the spacer elements is that it facilitates the attachment orremoval of the betsm formby providing mm iwsrking space in a normally crowded location, also because of the fact that the columns are cast before the beams sothat the insertion of'the' bolts through the apertures 23 should be done before pouring the concrete to prevent plugging of said apertures. The bottomplates of the short section are supported on the column-form by the upright channel-tie. 24, secured in any desired manner to the column-form.

Changes iuthcprccise construction, arrangement and combinaton of the various parts may be made without exceeding the scope of the claim and I rescrvethe liberty of making such changcs,,as vma1y be thought desirable. I

I claim:

In means for moldingtconcrete columns I. and beams into a monolithic structure, the oomtanetion of ho (terms for said columns of form, aid beams, and means for securing the ends of said beam forms to their corresponding column forms;