US1300381A - Mold-form. - Google Patents

Description

JULIUS J. GR'UENFELD, JR., AND PAUL KIBCI-IER, OF CHICAGO, ILLINOIS, ASSIGNORS TO i MASSEY CONCRETE PRODUCT-S CORPORATION, 0F CHICAGO, ILLINOIS, A CORPORA- 'IION vOF VIRGIN IA..

MOLD-FORM.

Specification of Letters Patent.

Patented Apr. 15, 1919.

v Application filed May 28, 1918. Seria1No.235,8iO3.

T 0 all whom if may concern Be it known that we, JULiUs J. Gamin- FELD, Jr., and .PAUL Krimi-1ER, both citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certainnew and useful Improvements in Mold-Forms, of which the following is a' specification.

This invention relates to a mold form for use in the making of kconcrete and other oementitious poles, and. has particular reference to means for forming step receiving recesses adapted to receive steps of the same general character as that described and claimed in our co-pending application Serial Numberl 235,802, filed May 21, 1918.

Our invention has for one of its primary Objects the provision of a simple mold form of the character described which can be readily stripped from' the completed pole without injury to or defacement of the fresh concrete. Our invention also contemplates a mold form "the parts of which may be quickly assembled or taken apart and which are firmly held in position during the forming of the pole, particularly where the pole is made by a rotary process.

The foregoing, together with such other objects as may hereinafter appear or are incident to our invention, we attain by means of a construction which we have illustrated in preferred form in the accompanying drawings, wherein Figure 1 is a side elevation of a portion of a pole showing the step receiving parts thereof; Fig. 2 is a cross-section of the pole shown in Fig. 1; Fig. 3 is a section taken on the line III-e111 of Fig. 1 with a step in position; Fig. l is a cross-section through the mold with the step recess forming p0rtions in position; Fig. 5 is a side elevation of Fig. 4; Fig. 6 is a section taken on the line VI-VI of Fig. 5; and Fig. 7 illustrates a modication of our invention.

Referring now to the drawings, the pole, which may be of the hollow or solid type, is indicated by the reference letter A, such pole having arranged on alternate sides a plurality of recesses and apertures 8 in which the steps indicated as a whole at B in Fig. 3 are received. Such steps form no `part of the present invention being described and claimed in the aforo-mentioned application for Letters Patent. The top and side walls or edges of the recesses are curved or 4therethrough adapted rounded Vand the bottom walls or edges thereof are sloped, as indicated in the drawings, so that the recesses will be self-draining. The apertures 8, which are preferably rectangular, are located at a point below the middle 4of the recesses, in order to facilitate the insertion of the linemans spurs into the steps which are to be introduced and fastened in the apertures 8.

The mold C for making the poles is preferably divided longitudinaly in a plurality of parts, suoli parts being provided with 'flanges 9 adapted to be secured together vat intervals by means of suitable bolts 10. The sections or parts of the mold may be provided intermediate their ends with stiifening ribs 11. Secured to thev inner surface of the mold' and on alternate sides thereof are a plurality of cores 12 which are shaped to form the recesses 7 above described. The cores are secured to the mold form by means of the screws or studs 13 and each core is provided with `an aperture 141 extending to receive a plug 15 the end of which projects beyond the core Aso as to form the apertures 8. The cores 12 are mounted so that the apertures 14 therein, come opposite similar apertures 16, formed in the mold wall, and the plug 15 is provided with a head or shoulder 17 which is adapted to take against the outer surface of the mold form and limit the inward movement of the plugs. The cores and plugs are so located that when the parts are assembled the head 17 of the plugs will lie adjacent to the ribs 11 which are utilized as a means for preventing the plugs from shifting out of position. In order to accomplish this result the ribs are provided with apertures 18 and the heads 17 of the plugs are provided with similar apertures 19 adapted to receive the cotter pins Q0. This fastening means is particularly useful where the poles are formed by the rotary process as the cotter pinsprevent the plugs from working out under the action of the centrifugal force developed. In order to remove the plugs we provide apertures 21 in the heads 17 adapted to re ceive a suitable form of tool.

The operation is as follows, assuming that the parts are assembled as shown in Fig. 4 and that the pole A the rotaryA or other method: Upon completion of the pole the cotter pins 20 are rst withdrawn and then the plugs 15 are withhas been formed by drawn. The plugs may be thus withdrawn without defacing or injuring the fresh concrete as they will strip through the aper# tures 14 in the cores 12. After the removal of the plugs the sections of the mold may be readily stripped.

In the modification shown in Fig. 7 the plugs 22, instead of being removable as in the arrangement already described, constitutea permanent Vpart of the cores l2.

l. A mold form for making concrete poles comprising a shell having on .its inner j surface a plurality of cores arranged on alternate sides and adapted to form recesses in the face ofthe pole, and removable plugs mounted in the cores, the inner ends Iof* which are adapted to project inwardly beyond the cores. j j Y 2. VA mold form for making concrete poles comprising a shell and a4 plurality of removable plugs vmounted therein alternately on opposite sides in such manner that the said `plugs have one end projecting inwardly into .Copies of this patent may be obtained for the shell, and the other end outwardly therefrom, said outer ends to the shell.-

3. A mold form for making concrete poles comprising in combination a shell, a plurality of cores on `the inner face of said shell, arranged on alternate sides thereof,- shell and cores lbeing apertured, and removable plugs adapted to be inserted in said apertures, the ends whereof are adapted to project inwardly beyond the cores.

4. A mold fr making concrete poles comprising in Combination Snell. having n pin. rainy of apnntnnen alternately arranged Aon; opposite side said shell being provided with projections adjacent said apertures, a plurality' of pings npted to be removably inserted in apertures', the ends whereof project inwnny within Snell, and means fon secnning said pings' to said proj-nations.

In testimony" whereof, we have hereunto signed our franges.- ,j

JUL Us J.. GRNFELD, Je

PAUL Krnennn.

five' cene; eaqnty addressing* 15in #connais-innen nifnfents, washington, n. o.

and means for detac'hably securing said

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