US1611804A - Molding machine - Google Patents

Description

'Dec. 21 1926.

H. BARKscl-IAT MOLDING MACHINE File@ MarCh'g, 1926 l ffy] 2 Sheets-Sheet l Dec. 21 1926; 1,511,804#y H. BARKSCHAT l MOLDING MACHINE Filed March 29, 1926 2 Sheets-Shee 2 @fr f" Patented Dec. 2l, i926.

narran stares Lenser earner carica.

HENRY IBARKSCHAT, OF LOS ANGELES, CALFONIA, `ASSIGNB, T MARBELTE COR- PORATION OF AMERICA, OF LOS ANGELES, CALFGRNIA, A CORPORATION OF DELA.-

WARE.

nonnina MACHINE.

Application filed March 29, 1926. Serial No. 98,175.

rfhis invention has to do generally with machines for molding plastic material by the well known centrifugal method, and has as its principal object to provide a machine which includes a cast metal mold, there being provisions in connection with the Inachine proper and the mold which render the use of such cast metal molds feasible. In order that a clear understanding may be had of inventorsadvance in the art it may be well to point out very briefly certain prior developements. When castings were first made by the centrifugal method, the molds were made up of wood, this for the reason that the inner mold faces could be lcarved and otherwise worked to produce fairly intricate designs which were to appear on the external face `of y,the cast article. When such molds were used in connection with the casting of such massive articles as ornamental light posts, and the like, it was found that they could not withstand the severe service conditions arising` from the necessity for tightly gripping the mold in the centrifuges, rotating the molds at high speed, and assembling and disassembling the molds between each casting operation. The next step was to produce sheet metal molds, but it proved very difiicult to secure many fine intricacies or de-v tails of designs in metals of a thickness sufficient to stand up under the severe service conditions.

jaws of the centrifuges. In revolving these molds at high speeds there was very considerable vibration set up in the centrifuges and consequently transmit-ted directly to the cast metal molds. The sharp, rapid vibration soon fatigued and crystallized the molds to such an extent that they were Worthless after but comparatively few suc cessive operations. Except for their tendency to crystallize, lthe cast-metal molds were found vastly superior to either wood or sheet metal molds. Applicant has made possible the use of cast metal molds by interposing members having a ldegree of yieldability or resiliency -between the chuck jaws and body of the cast metal mold, the drive between the chucks and mold thus beingV transmitted through this resilient medium, which is preferably wood. The woodl is found to absorb and take the sharpness from Then came the cast iron mold vwhich was gripped directly by the chuck the vibrations to such an extent that cast metal molds equipped therewith are capable of standing .up indefinitely, as inventor has proven by continued practice.

Inventor has also found that by gyrating one end of the mold with respect tol the other, that the disengagementof excess water from the plastic mass is hastened, that the compacting of the aggregate deposited 0n the mold walls is eifectedy more quickly and solidly, and ythat classification of the constituents of the plastic mass is avoided. This `gyration naturally gives added movement to the centrifuges, and mold, but the wood or resilient member between the vmold body and they chuck jaws reduces the sharpness of this vibration `as imparted to the metal of the mold to such a degree` that the metal does not become quickly crystallized.

In a copending application entitled Molds lfor concrete posts and the like, filed by the present'inventor February 24, 1925, Serial No. 11,052, applicant has shown and claimed a mold constructed in accordancevwith the. above, and has there claimedl a particular manner of securing the wooden sheathing to the mold body. 1n the presentv `application he is claiming the combination of a centrifuge and a cast metal mold so encased,` or 4more broadly speaking, of a 85 centrifuge and a cast metal mold body between which and the driving element vof the centrifuge is interposed a resilient member. Further objects and novel features of the invention will be made apparent in the fol- 9e` lowing detailed description, reference being had to the accompanying drawings in which: Fig. l is a side elevation of va machine embodying my invention;

Fig. 2 is an endelevation of 'Figu l; 95 Fig. 3 is a diagrammatic view illustrating certain characteristics which the machine. may possess;

Fig. 4 is an elevation of a mold made in accordance with this invention; .4 100 Fig. 5 is a section-on line 5-5'of F ig. 4; and

Fig. 6 is a section on line GI-G'of Fig. 5.

I will first describe the mold shown in Figs. 4 to 6, inclusive, this mold being adapt- 105 ed to cast concrete lamp posts having well defined cap and base portions, but` it will be understood the invention, in its. broader aspects, is equally applicable to molds for casting shafts of uniform or gradually diminishing diameters throughout their longitudinal extent. The metal shell of the mold is ma'de up of a shaft-like Vbody having` at opposite ends the base B and cap C. The shell is parted longitudinally to form a plurality ot separable sections 10. Each section is made up of shaft portion 11, which I Will hereinafter term the body portion of the mold section, base portion 12 and cap portion 13, 'the portions bei-ng bolted together more or less permanently so eac-h section may be handled as a kunit handling the assembly and knocking down of the mold. ln other Words, While each section is made up oit `separable p arts,the parts are not usually uncoupled except for replacement or repair. The material of which the sections are lcast is not material to this invention, though l have used both cast iron and cast aluminum, the latter being` preferable due to its relative lightness, and duct-ility, these lbeing important characteristics when it is remembered that thel molds are ordinarily of veryyconsidferable length and diamteer and are eX- Y posed Ito severe'vibratiogn.

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lt is not necessary to the present invention that the provisions tor join-ing the section portions be of the type illustrated, although the drawings shov.7 a connection uf'hich is particularly Well adapted for use with the sheathingl or resilient vibration absorber shown in the drawings. Therefore, While l Will describe the illustrated connection between .the portions, Ythis is not to be construed as limitative on my broader claims.

Body portions 10 have end flanges 14, 15, which `are adapted to be bolted at 14a to end langes16and 17 of base portions 12, and 13, respectively. Extending' from `flanges 1.6 and 17 are band flanges 1S which extend over the edges of 'flanges 14, and 15, and-over the outer peripheral faces et 'body portions 11 tto provide sockets 19 at both ends of each body7 portion.

lllfood sheathing is applied to the vouter faces voff the metal vbody portions, and While the invention is not so limited, it is preferable that this slniatb-ingextend from end to end oi said portions. F or instance, a strip of Wood sheathing 2O may extend longitudt nally vover each body portion, the ends of the strip being set in sockets 19 and secured in place by screws 21 which are counterH sunk. in flanges 18, or 'they may be merely friction tight Within. the sockets.- faces et the Weed strips arepreferably 'ormed substantially complementary to theV outer faces of `the body portionau'hile the Outer of the .strips preerably are subv ate. miestrps may he eut l.at to.' .gire aecessgto bolts y ,K idsane s 2st, the latter. @del assesses -leellr sosa-theres ended dru- The inner The outer peripheral faces oi band 4flanges 18 are preferably covered with bands of heavy ta-bric or betting F to provide a goed gripping surface for the centrifuge chucks to be later described) which engage the molds at these points; ilanges 18serving- Vthus not only as holders for the ends otthe sheathing strips, but also as chucl engagement members. Y l

Both the Wood strips Where they enter the seelcets, and bands l? provide resilient members .between the centrifuge chuclfrs and the cast ietal body A or body portions 11, so that vibrations set up by the machine and existing` in the chucks are somewhat damped or softened before they reach the cast metal body portions, this relief ot the body portions trom excessively sharp vibrations contributing greatly to the useful lite thereof. lll/There the Wooden strips are longitudinally (3o-extensive with the body portions, as shown, they also serve as reinforcement members for said body portions and distribute the vibrations from the driving members of the centrituges longitudinally alongl 'the mold rather than allowingv such vibrations to become concentrated at the pointoit driving engagement between the centrifuge :and mold, thus tending` to de Vcrease the liability .et the mold casting; be-

con'iinp; crystallized or unduly fatigued'. Y

lllhile the particular type ot ce. tri'ugc used in 4ronfibination.with the mold is not essei'itiafl to the present invention, the type illustrated is especia ly Well adapted to thev purpose, and l as certain features which particularly call the protection ot the mold against destructive ibrat-ion.

Centritug/:e is made up et two subslaa tial-ly idei t units 2'? and 28, `these units having cylindrical mold carriers or open TS'G own. nieans are e-sl lled inthe art) and are vadapted lo e Y age driingly the Ymold bands F. y The jraivslgaremovablelin any -Well known ,manner (notabene.) to allewesy l awel otstlie mold.

:drumiis operatedy yrollers whieh ctively. ble in arefiournaled: 0.115 trainee: .8s engage seA (l and 30, Which'carry chuelr.

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drum roll ways 35 in the usual manner, units 2?' and 28 ordinarily beino set up so the drum axes are approximately alined.

ln order that frames 34 need not be built excessively heavy to withstand the vibrations set up by the drums during rotation thereof, it is preferable that roller shafts 33a be yieldably mounted in the frames. For instance, they may be mounted in the manner set forth in United States Letters Fatent No. 1,391,164, issued to me September 20, 1921; shaft boxes being slidably mounted in the frame for movement radially toward and away from the drum axes and being urged toward said axes by adjustable springs 8G. Belts 3'? are run over crowned portions 38 of the drums and are driven from power shaft 39 by pulleys L10. Vhile the drawings indicate that both drums are positively driven, it is usuually desirable to apply power to one only, the other merely being guided in its movement by the associated set of rollers 33.

`IWhile the vibrations set up in jaws 31 and by rotation of the drum are considerable, they are damped before they reach the body portions of the mold by the fabric bands F and wood strips 20. rEhese vibrations of the chuck jaws are aggravated and consequently there is more need to dampen them when the centrifuges are made in accordance with the disclosure of the patent issued to me on July 7, 1925, for Machine for molding concrete posts and the like77 llo. 1,54%,87 9.

'l have here indicated in Fig. 8 that the centrifuge of the instant application is similar to the one shown in the last mentioned patent, though this is not limitative on the present invention. 1t will serve to illustrate, however.l a case where it is particularly essential that the vibrations between the driving member of the centrifuge and the cast. metal body portion of the mold be damped or absorbed. As set forth in said last-mentioned patent, it is found that by gyrat-ing one end of the mold with respect to the other, the disengagement of the excess water in the plastic mass is hastened. that the aggregate deposited on the mold walls is compacted more quickly, and that the concrete is kept from classifyin0". Alteration of the machine or mold to accomplish such gyration may be accomplished in a variety of manners, but I have here chosen to show but a single method. Referring to Fig. 3 chuck jaws 32 in drum 30 are adapted to hold one of the bands F concentrically ends) with the advantageous effects mentioned above. This gyration naturally causes sharper vibrations of the chuck jaws where they drivingly engage themold, but such` vibrations are softened before they reach the mold body due to the presence of the resilient fabric bands F or the wood Y sheathing or both.

It will be understood the drawings and description are to be considered merely as illustrative of and not restrictive on the broader claims appended hereto, for various changes in design, structure and arrangement may be made without departing from the spirit and scope of said claims.

I claim: Y

11n a machine of the character described, a pair of spaced and substantially axially alined centrifuge units having mold 'raking chucks, a mold having a body portion of cast metal, and relatively resilient.

elements on the mold and interposed between the body portion and the jaws of the chucks.

2. 1n a machine of the character described, a pair of spaced and substantially axially alined centrifuge units having mold taking chucks7 a mold having a body portion of cast metal, and wood sheathing on the body portion and interposed between said portion on the jaws of the chucks.

3. n scribed, a pair of spaced and substantially axially alined centrifuge units having mold taking chucks, an elongated mold having a body portion of cast metalwoodV sheathing extending longitudinally from end to end along the body portion and interposed between said portion on the jaws of the chucks; and means for holding the sheeting in tight engagement with the external face of the body portion.

In witness that l claim the foreging l have hereunto subscribed my name this 8th day of March 1926.

HENRY BARKSCHAT.

a machine of the character cle-1

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