US1875463A

US1875463A - Concrete fork

Info

Publication number: US1875463A
Authority: US
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

4 Sheets-Sheet l AZZ INVENToR. of TQM ATTORNEYS.

y BY l,

Sept. 6, 1932. O, K JONES 1,875,463

CONCRETE FORM Filed June 30, `1931 4 Sheets-Sheet 2 A TTORNEYS.

Sept. 6, 1932. Q K. JONES 1,875,463

CONCRETE -FORM Filed June 30, 1951 4 Sheets-Sheet 3 :a l\ t a 2 t .ll'f3 lll'o A l IINVENTOR. l\` Q BY fw M A z A kl ATTORNEYS;

O. K. JONES Sept. 6, 1932.

CONCRETE FORM 4 sheets-sheet 4 Filed June 30, 1931 INVENTOR.

ATTORNEYS.

UNITED STATES PATENT OEI-ICE OSGOOD K. IIINES.` 0F SAN FRANCISCO, CALIFORNIA f CONCRETE nomi applicati@ mea :une 3o, 1931.' serial No. 547,889.

This invention relates toconcrete forms and especially to a form which is intended for wall structures and the like.

The object of the present invention is to generally improve and struction or operation of concrete formsof the character described; to providea form which may be constructed of metal throughout; 'to provide a form in which all parts may be used over and-over again; to provide a spacing elementvto maintain a predetermined spacing between the side Walls of the form; to provide va spacing element which is adjustable y to fwalls of different thickness; to provide a' spacing element comprising a central spacing bar, and a pair `of removable end members; toprovide a spaclA ing element of the character described which forms a guide and a support for a pair of tie wires and any intermediate spacing rod;

to provide a spacing element in which-thev end sections are readilyremoved after the concrete has partially set, andv which; leaves cavities in the surface of the wall sufficientlyy deepy to permit the ends of thek tie wires to be bent into the cavities and. then covered"` with grouting or a like material so as to leaveV a smooth finished wall in which the spacing rods and tie wires are thoroughly embedded and covered; to provide a spacing element or unit which may be assembled at any time before placement, during erection of the forms so as to reduce time andv to simplify the work ofassembling and erecting the forms; to provide'a formwhich is strong and substantial "in construction 'and rigidly braced and in which the bracing members are progressively raised as the AWall structure increases in height so that the same bracing members may be used over -and over until the wall is completed; and

further, to provide a form which requires nol support but the wall itself and which is so constructed and assembled that while the concrete in the lowerv portion of the wall is setting,concrete may bepoured above the same, and while the last pour is setting the lower part of the form may be stripped, elevated and assembledin position kabove the' last pour; thus permittingv setting, pouring,`

simplify the con-l stripping and assembly operations kto continue -in proper se uence with comparatively-little, if vany de ay in the work.

The manner 1n which the form is constructed and assembled is shown by way of illustration in the accompanying drawings, in which: l

Fig. 1 is a perspective viewof a portion of the form erected in position. y

Fig. 2 isa centr/a1 vertical section of a portion of the form when erected.

Fig. 3 is a sectional view of a portion of a.

` 'completed wal 1 v Figs. 4, 5 and 6 killustrate different forms of offset plates. o Y

Fig. 7 is a horizontal section of a portion ofthe form when erected. n

Fig. 8 is a partial side elevation of the exterior portionof the form showing the relative position ofthe braces and the com bination tie and guide plates.

Fig. 9 is a perspective viewshowing the assembly of they spacing element 'and the pins, tie and .guide plates with which 'the spacing elements cooperate.

vFig.V 10 is a perspective view of the lowermost pins, tie and guide plate.

'Referring to the drawings in detail and particularly to Fig.l 1, the essential parts of the form are the side plates A forming the sidewalls of the form; spacing elements B whereby the side walls of the form are' tied together and the thickness of the wall determined; bracing bars C whereby strength and'rigidity of the form is insured; and a series of combination guide and tie plates C, the function of which will hereinafter be described.

l The side plates referred to are in this instance shown as constructed of comparatively thin steel plates or the like, and theymay be a foot or Vrnorewide, while the length will bev such as can be most conveniently handled. A few short lengths will be employed to fill in between window openings, doors and the like, and where column effects are desired on the surface of the wall, oifset plates may be employed as indicated in Figs. 4 to 6. While -K steel plates are preferably employed, wooden f, employed.

planks or similar material may obviously be used.

The spacing'elements indicated at B are best illustrated in Figs. 1 and 9. Each spacing element is similar in construction and the description of one will accordingly suffice. The spacing element comprises a pair of cone shapedmembers such as indicated at2 and 3. They may be constructed of pressed steel, cast iron or the like.

provided, as .shown at 4. The innerends have two perforations formed therein, 'as indicated at 5 and 6, and recesses or sockets: 7 are also formed at the' inner endsto receive and support a spacing rod` or bar such as indicatedfat 8. The perforations l5 and 6 formed at the inner end of eachV cone are provided so that a pair ofv tie wires,A such Yas indicated at 9 and 10, maybe threadedor passed. through the same. The manner in which the spacing elements are assembled and placed in' position between the side walls and the form willhereinafter be described.

The side walls'of the form are, as previously described, formed by the plates A.y Means for bracing. the side plateswhen erected is accordingly essential and I beam'sror Tshapedstructural bars, such as indicated at C, are

The combination tie and guide plates are best illustrated in Figs. 1, 7 and 9. They are constructed of thin steel and are .substantially square Vin shape. They are vfiat and the di- -fagonally-opposed corners are cut, as indicated at 11 and 12 -The 'cut portions are then bent upwardly to form a pairv of guidek lugs 13S and 14. Eachplate is also `perforated as indicated at 15 and lto permit the tie wires to pass through, as will hereinafter ,bei described. The majorportion of the' combination tie and guide plates employed `arefof theshape shown in Fig. 9. A few plates are, however,` constructed as shown in

Figs.l

1 and 10; These plates will be known `as the bottommost or base plates, as they'rforma guide and support for the lowermost side plates A and for the 'bracing' bars C 'The plates shown in Figs. 1 and 10 are .substani tially identical in shape to the plates shown in Fig. 9, theonly difference being that the lower edge is provided withone small inwhile the opposite face is-provided with abase fiange 18. This is perforated to permitnails or the like to be. driven through, asindicatedat V19.' The'plates are otherwise provided .with the small lug- Q0. andthis isperforated, as indicatedat 21.,.to receive atie wire, as will hereinafter be described. v f

In actual operation. when' the form is tc be set up it may be accomplished b v first placing a pair oftimbers on the'ground indicated at 22 in F 1. A plurality of base plates.

such as shown in Fig` 10, are then nailed to Their outer ends are( open and one or more inturnedflanges' are the timbers as shown at 19, the spacing between them being determined by the thickness of the wall and the desired spacing between the bracing bars C. Vhen the base plates have been secured, the structural steel bracing members C are placed vertically between the guide lugs 13 and 14e and they are there temporarily held by angle braces or the like not shown, as such bracing merely serves the function of holding the members C in a vertical position until a portion of the mold and wall has been erected.

'After the brace plates and the braces C have been placed in position, the lowermost vset of plates A are applied to the inner surface of the base plates and are there supported by the inturned lugs 17. A series of spacing units, such as indicatedV at B, are then placedin position along the upper edge of the `lowermostplates A. The spacing units are preferably assembled in the form shown in Fig. 9l before they are placed in lposition soasto reduce the time required' in erecting the molds and also to simplify the operation of erection. Each spacing unit, as assembled andthe inner surface ofthe braces C and the

lugs

13 and 14 of the plates are engaged with the ianges of the braces by merely tilting them to an angular position and then re` versing themovement so that the lugs may engage the flanges. When the plates are straightened out, the lugslfully engage and the tie Wires Will rest on the upper edge of the lowermost plates A. The spacing bar or rod 8 is then inserted between the cones and the spacing between the sides'plates is thus determined and maintained. The ends of the tie wires passing through one B are merely bent or knotted at-'24 to prevent them from pulling through. The opposite ends of the tie wires project through the opposite plate D and are coniparatively long, so that they may be twisted and tied as the erection and the assembly of the form continues. Y

When the first series of spacing units has been placed in position, a second set of plates indicated at A" is placed in position and a second set of spacing units indicated at B is placed on top thereof and the plates D carriedtherebyare interlocked with the flanges of the bracing members C, as previously described. The free ends of the tie wires are brought downwardly as indicated Vat 26, while the free ends of the tie Wires of the lower spacing units are bent upwardly as of the plates as indicated indicated at 27.l The free ends overlap and spacingis maintained .between the same by the cones and the spacing rods.` The assembly and erection of thev form continues until a suitable height is obtained, and if the wall is to be reinforced with steel or the like, this is inserted and secured in the usual manner, either prior to the erection of the form4 or while the assembly of the form is taking place. The concrete is then poured and after the pour, the operation of erecting andassembling the form is continued. The second section is then poured and while this is setting the bracing bars C aremoved upwardly, this being accomplished b-y means of a screw jack or any other suitable device.

The

lugs

13 and 14 in the several guide plates merely frictionally secure the brace members C, and as such permits the same to be moved upwardly by a screw jack or the like. When the bracing members have been moved, the

tie wires

26 and 27 are cut olf close to the plates D. The plates A are then free to be removed and the sideform plates A may then be stripped off leaving the bare wall. The parts thus removed may be elevated and assembled at a point above the last pour and the work may thus be continued indenitely,as thesame parts are used over and over again.

After the lower portion of the Wall has been stripped, the

cone members

2 and 3 are lightly tapped with a hammer or a suitable tool is c inserted to engage the inturned lugs 4. By tapping the cones and by exerting an outward pull, the cones are freed and removed. The free ends of the tie wires are'then bent into the cavities left bythe removed cones, as shown at 30 in Fig. 3, and the cavities may then be filled with a grouting material or the like, thus leaving a smooth finished wall surface in which the spacing bars 8 and the tie wires are thoroughly embedded and covered. When thel bracing bars C have been moved upwardly and the lower part of the wall stripped and finished as just described, it is obvious that the'wall itself forms a support not only for the side plates A, but also for the bracing bars, the combination tie and guide plates and the spacing units B.

Exterior scaffolding, if the wall happens to be an exterior wall, may thus be eliminated and the only scaffolding required will be an interior scaffolding which may bel used during the erection of the mold and for the handling y of the concrete. Thev manner of constructing and assembling the form is exceedingly important, as it permits the mold to be quickly erected and properly aligned, and when so erected and aligned it is 'strong and rigid and it permits portions of the mold to be stripped while other portions containing concrete are setting and while still other portions are being elevated and erected. The work of setting, stripping, assembling, pouring, etc. may

thus take place in proper sequence with a comparatively little, if any, loss vof time, and

skilled labor may be' almost entirely eliminated, as the work-to .be performed can be taught to practically anyone.

Any thickness of wall may be constructed; for instance, a siX inch wall Will probably require a spacing rod, such as indicated at 8, approximately three inches in length, and an eight inch wall will require a five inch spacing rod, and so on. The. length of the spacing rod determines the thickness of the wall, but thesame end sections or cones may be employed whether the wall is of one thickness or another. It should furthermore be understood' thatwhen the cones are knocked out of the Wall after the concrete is partially set, they will be used over and over again. This is true of all the parts employed, as the yonly parts remaining in the wall are 'the spacing rods 8 and tie. Wires.

It should be noted that the tie wires 9 and 10 together with the plates D secure the side forms A against removal in such a. manner as to be independent of the bracing bars. This is important, as it permits the bracing bars to be raised or elevated just as soon as the last pour of Yconcrete commences to set and it, furthermore permits the side forms A and plates D to remain in position on the wall as long as desired, or in other words, until such time as they will be required, as they are secured in position entirely independent of the bracing bars. c

The manner of tying the wires 9 and 10, that is, in an. up and down direction at points between the plates D, is also important as it permits the side forms A to be pulled tightly together in a vertical direction, thusreducing the spacing between the side form platesy While certain features of the present inven tion are more or less specifically described, I wish it understood that various changes may be resorted to within the scope of the appended claims. Similarly. that the materials and finish of the several parts employed may be such as the manufacture may decide or varying conditions or uses may demand.

Having thus described myinvention, what I claim and desire to secure by Letters Patent yl. In a forni structure of the character described, a plurality of brace bars, a plurality of elongated` side plates forming the side walls of the form, a plurality of guide plates interposed between the side plates and the brace bars, and a plurality of spacing units yinterposed between the side plates.

2.. In aform structure of the character described, a plurality of brace bars, a plurality of elongated side plates forming the side walls of Jthe forin, a plurality7 of guide plates interposed between the side plates and the brace bars, a plurality of spacing units interposed between the side plates, and tie Wires extending through the spacing Vunits, sait wires also extending' between the side plates and through the guide plates and tied thereto. Y

3. In a form structure of the character described, a plurality of brace bars, a plurality of elongated sidev platesv forming the side walls of the forni, a plurality of guide plates i interposed between the sine plates and the brace bars, ineans frictionally securing the brace bars to theguide plates, a plurality of spacing' units interposed between the side plates, and'tie wires extending throughthe spacing units, .said wires also extending' between the side plates and through the guide plates and tied thereto.

4. In a forni structure of the character described, a plurality of brace bars, a pluialitg7 of elongated side plates forming the side walls of the forni, a plurality of ,Qjuideplates interposed betweenthe side plates and the brace bars, lugs formed on the guide plates vand frictionally securing and guiding the brace bars, and a plurality of cone shaped members disposed between the elongated side plates and' engaging the inner faces thereof, spac ing bars disposed between the cones and supported thereby,n and tie `wires extending through the cones, said wires also extending between the -side plates and through the guide plates and tied thereto.

5. In a form structure of the character described, a combination tie and guide plate comprising' a flat substantially square plate, a pair of guide lugs formed on the plate and said plate being perforated to permit ltie wires to pass therethrough. A

.6. In a forni structure of the characterdescribed, a combination tie and guide plate comprising' a flat substantially square plate, said plate being" cut at diagonally opposed corners and the out portions being bent towards trie plate to form a pair of guide lugs, and said plates being' perforated to permit tie 'wires to pass therethrough.

f 7. In a forin structure of the character de scribed, a combination tie, guide and base plat-e comprising a flat substantially square plate, a perforated Ybase flange on one end of the plate, whereby it may be secured to a support, a pair of guide lugs forined on the plate, and Ya perforated lug,` at one side of the plate for thereception of the tie Wire.

OSGOOD K. JONES.