US1299739A

US1299739A - Mold for reinforced-concrete posts and the like.

Info

Publication number: US1299739A
Application number: US25234218A
Authority: US
Inventors: Henry A Landwehr
Original assignee: AMERICAN CEMENT PRODUCTS Co
Current assignee: AMERICAN CEMENT PRODUCTS Co
Priority date: 1918-09-03
Filing date: 1918-09-03
Publication date: 1919-04-08
Anticipated expiration: 1936-04-08

Description

i H'. A. LANDWEHR. MOLD Foa REINFORCED CONCRUFPOSTS No HE LIKE.

I APPLICLATXOKN FILEQSEPT. 3, 1918. ,299,739.'

Patented Apr.*8,1919.

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UNITED srairns PATENT orienten,

HENRY A. LANDWEHR, OF LOS ANGELES, CALIFORNIA, .ASSIGNOR TO AMERICAN i CEMENT PRODUCTS COMPANY, 0F LOS ANGELES, CALIFORNIA, .A CORPORA- TION OF CALIFORNIA.

MOLD FOR REINFORCED-CONCRET POSTS AND THE I'JIK.-

Specification of Letters Patent.

i 'Patented npr. s, 1919.

I Application filed September 3, 1918. Serial No. 252,342.

To all whom it may concern:

Be it known that I, HENRY A. LANDwEHn, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have invented new and useful In'iprovements in Molds for Reinforced-Concrete Posts and the like, of which the following is a specification. Y

This invention relates to means formold ing and forming reinforced concrete posts and the like, and particularly to molds used for forming hollow reinforced concrete posts by the centrifugal process or methbd; and the invention has partie arly to do with the provision 'of an improved form of mold and improved forms of means for holding reinforcements or other parts which are adapted to be cast into the concrete body `which is formed in the mold. One of the particular features of this invention is the-provision of means forholding anchor i 4 feet in the mold, to which anchor feet the reinforcements of the finished post, or the like, are attached, and which anchor feet become finally the anchors by Which the `finished post is secured on its permanent base.

This application forms a continuation in partof my application' for reinforced concrete posts and method of making same filed Nov. 17, 1916, Serial No.,131,821.

The invention will be. best yunderstood fromtlie following detailed description of a preferred form of mold and .of the method y of its use; reference being had forzthis purpose to thel accompanying drawings in which I illustrate preferred forms of devices, and `in whichi Figure l is a longitudinal section showing the mold and a post in process of formation; Fig. 2 is an end view of the apparatus shown *in Fig. 1; Fig. 3 is van enlarged detail section taken as indicated'by line 3-3 o'n Fig. 6', Fig. 4 is a transverse ,section` on line M `of Fig. 1; Fig. 5 is a detail elevation taken as'indicated by line on F ig. 4:; Fig. 6 is a detail section Von line 6-6 of 16, which are preferably hooked into Fig. 3; Fig. 7 isan end view of a modified form; and Fig. 8 is a longitudinal section of the end of the form shown in Fig. 7.'

The drawings show a postmade up of a cementitious body 10 with suitable reinforce-v ments/ The cementitious body may be made in any style or character desired and is preferably, by the centrifugal process, made with an interior longitudinal opening 11,

extending from endto end of the'post. The exterior ornanvntation of the post. may be as desired ,I il ustrate a form of post which is being put into extensive use and is being manufactured by the centrifugal process, in the manner I hereinafter explain. The post shoyvn herein has a iiuted surface; and I explain a forni/of mold whichis adapted to cast such a surface, or any other surface which has sunk and raised portions, as most The post has a base ornamented posts have.

12, and in this base I embed thefootbrackets 13. These foot brackets 13 are arranged with their horizontal parts extending out,

beyond the edges of the base to afford-far;- cility for connection with permanent `founfdslif-A tion bolts and with their vertical parts ex;K tending upwardly into the cementitiousfb to connect at 15 with the reinforcing".

foot brackets 13, in the manner ,sho. "4

These reinforcing rods 16 may be as as necessary, but are preferably four m' number, as are also the foot brackets, and the rods converge first inwardly and upwardly toward each other and then extend to the top of the post in substantially parallel but slightly convergent relation at the top of the post the rods connect, preferably by hooking, p 18.A The foot brackets 13 and the bolts 18 form end anchors for the reinforcing rods. It is, of course, immaterial how the rods connect with these anchors: and they may be integrally connected, especially in thc case of the bolts 18. In the finished post, these bolts 18 are used to hold the cap `plate and as shown at 17, with the bolts lamp fixture in place.A In the mold these A' bolts lb pass through the mold rap plate 37 and through closure plate l!) which closes a small opening in thc cap plate; nuts 2() se1`-\'ing`tohold the`elosure yplate in place and to put tension on the reinforcing rods.

The four reinforcing rods lGare laterally coni'iected by cross wires which aref also tially a long square reinforcing skeleton with the rods 1G at the' four corners. The reinforcing rods and wires being embedded in the concrete, and the rods being connected and more or less stressed between the upper cap and the lower feet of ,the post2 it will be seen that the finished post is eliiciently .and strongly reinforced. And this is particu-- crete itself is very closely and densely formed around the reinforcements, due to the peculiar action of the centrifugal process which throws the concrete to the outside and the water to the inside, making a voidless, non-porous concrete body.

allows the free' withdrawal oi. the mold from the figured surface of the formed con-` y crete and from. the hexagonal base l2.

Although a larger number ol separable 'parts may be used if necessary, l find three to be suflicient for most designs. Briel,I inspection 'of Fig. 4 will show that the three separable parts will draw oilA the molded concrete, The parts of the mold body may beheldtogether by means as shown at 6G;

eml'nodying bolt lugs 61 attached in opposing relation vto the edges of the parts of shell B1, bolts 62 passing through these lugs;

A.wedges 63 through the bolts, and nuts64 on the bolts. The bolts may be quickly released by removing the wedges and the nuts .A may be slightly loosened to loosen the means, as by Wedges 38.

wedges. A. cap plate 37 is provided for the mold. this cap plate being secured to thc head shell 32 b v any suitable fastening A base plate 39 is likewise provided and similarly scoured to the base shell )lil hy means ot' Wedges 4.0. rrlhis base plate 3S) carries a suitably shaped core ll for forming 4lhc hollow interior 42 of the hase oF the post. During formation,

' the Fool' brackets l are held in place by being placed against the base `plate 39 within ini-tal boxes 43. (lap screws or other suitable fastening means -lf pass through up crtures fl-'l in. the 'oase plate and through the apertures #l5 in the lootbrackets aud 'then screw' into lhe boxes ill? 46; Ihus i holding the foot brackets 1.3 rigidly to the tom plate 139, and may be closed at their.

outer ends. The boxes rcachthe outer surface of themold and are removable outwardly when the mold is to be taken oli' the formed post and when .the bolts 43 are removed. The removal of these boxesleavcs a clear opening around the projecting parts of bracketslf suliicient to `allow the sepayration of the mold parts on the parting larly true because of the fact that the coni.

linesLwithout the fact in the openings and Without any'danger of( knocking the feet loose in the concrete. Therelation .ofl the' bracket tov the opening may be best seen from Fig.. 6 where the opening intol which the box fits is designatedby numeral 43".

v The lower ends of the reinforcen'ients having been secured, the 4upper ends of the reinforcements are then .secured Vby the bolts 18 being passed throughthe cap plate 37 4andclosure plate 19 of the mold and the nuts being screwed down upon the plate to draw the reinforcing rods 16 tightly into their proper positions, and to properly'` stretch the reinforcing rods. The'tendency of the reinforcing rods to straighten dut andto move apart is resisted by the transverse tie wires 22. The reinforcements aie held tightly stretched in a position centering about the longitudinal center of the mold; so that, during the subsequent rotation, there is Ino tendency ot the reinforcements to be displaced from their proper position.

Theniold having been assembled, and the reinforcements put in place, as described. the plastic mixture is next placed in the mold. 'This mixture may have a superfluity of water; and the volume of the mixture and the proportion of water are ascertained by experience and ged accordingly; so that, when the water separated from the concrete by the centrifugal action, the resulting solidfied body of concrete will leave a. central longitudinal opening. The mold having been filled. with the flliid.'concrete, the base plate is closed by its cap 50; the' mold is placed in its horizontal position and isplaeed in the revolving machine, where it is revolved about its central axis at a suitable spoed for the requiredtime period to cause the concrete lo solidify in the form y jected to any treatment desired.

- parts to beremovcd without striking,

' plates ,of the mold.

1,299,739 i et feature oi the invention lies in the mold construction, etc. that allows tree and ready removal of the inol'd from the finished molded article. The multiple part mold is one means to accomplish this desired end. Then the removable boxes allow the mold ening or displacing the anchor feet. And

where vthe number of mold parts and the number of feet is the same, it is particularly useful where the number of mold parts and of feet are not the same and where there must be a considerable space made for free removal of the mold parts from the feet.

It will be seen that a further feature of this arrangement lies in the fact that the reinforcements are, during formation, extended and stretched between thev cap plate and the base plate of the mold, holding the reinforcements rigidly and tightly in proper position and at the same time tending to draw the mold ends toward each other. This feature is the result of the mechanical arrangement by which the anchor-v ing means at the top and bottom of the post are secured directly to the cap and base In Figs. 7 and 8, I show modified forms of device for accomplishing the saine end as liereinbefore described. I show base bars invention, Iclaim:

1. In combination, acolumn mold adapted to receive cementitious` material, comprising a. mold bodyl aud a detachable end closure plate, and an outwardly removable anchor iolding box in and extending through themold wall and detachably secured to theJ end closure plate, said box having an open end .interiorly of the mold to receive and hold a reinforcement anchor which projects into the interior of the mold.

2. In combination, a column mold adapted to receive eemcntitious material, comprising a mold body and a detachable end closure plate, and an outwardly removable anchor holding box in and extending through the mold Wall, and detachably secured to tho .end closure plate, said box having au open end interiorly of the mold `to receive and hold a reinforcement anchor which projects` into the interior otthc mold, and a bolt y passing through the end closure plate and into the box and adapted to pass through the reinforcement anchor.

3. In combination, a coiumn mold adapt-ed to receive cementitious material` compris-` ing a mold body and a detachable endvclosure. plate` and an outwardly removz'iblc anchor holding box'in and extending through the niold wall and detachably secured to the end closure plate, said box' having an open end interiorly of the mold to receive and hold a reinforcement aiv Ihor which projects into the interior of the mold, the box being openvon its face next the end closure plato so that the reinforcement anchor held therein may bear directly against the end plate.

4. In a separable column mold, a mold body comprising a plurality .of separable parts, the wall of a part having a boX receiving aperture extending to the exterior surface ot the Wall so that the boX may be removed outwardly, a .reinforcement anchor holding box in said aperture, said box hav! ing an inner open end to hold an anchor which projects into the' mold interior from the inner end of the box opposite the outer end toward which the box is moved for removal, and means for holding the box and the anchor in place.

5. In a separable column mold, a moldr Vbody comprising a plurality ot sep fable parts, the wall of a part having a box ieceiving aperture extending to the exterior surface of the wall so that the box may be removed outwardly, a reinforcement anchor holding'box in said aperture, said box having an inner open eind to hold an anchor `rwhich projects into the mold interior, and 4a single bolt passing through a part of' the inoldand the anchor and into the box to hold the box and anchor in place.

6. In a column mold for cementitious or vplastic material, a mold bodydii-'idcd into a plurality ot separaliile. parte. the walls ot the part-s having box receiving apertures extending from the interior to the exterior surface so that boxes in said apertures may be `removed outwardly, and reinforcement holding boxes in said :iper-tarts with open inner ends to hold a rciniiorcement which projects into the mold interior.

7. In a column mold for cementitious or plast-iematerial,a mold body divided into a plurality oit' separableparts, the walls of the parts having box receiving apertures extending from the interior lo the. exterior surtaee. so

that'boxcs 1n saidaperturesl may be removed outwardly,and lieinioveemeut holding' boxes in said* apertures wlith open inner ends io hold a reii'iforcei'ncnt. which projects .into `the mold iiiterior, the. number ot said separable mold parts .and the number ot' said box recci ving apertures being unequal.

,3. In a column niol d tor cementitious or plastic material, a mold body with a Wall hav in an aperture therein extendin from its interior surface to its exterior surface, and a reiforcem'ent holding box in said aperture, In witness that' I claim the foregoing said box'being hollow and open at its innerv have hereunto subscribed my neme this 6th end at the-innerv Wall surface to receive a day of August, 1918. :reinforcement- Which projects into the mold, y

and the box being outwardly endwise e- HENRY A. LANDWEHR.

moiableof the reinforcement and out of the v Witness aperture. VIRGINIA I. BERINGER.