US1555691A - Cast truck bolster - Google Patents

Description

Patented Sept. 29, 1925.

YU-SKE MIYASAKI, or nAnsAsloIrY, MISSOURI.

CAST TRUCK BOLSTER.

To all whom it may concern subject of the Emperor of Japan, residing; at Kansas City, inthe county of Jackson and State of? Missouri, have invented certain new and useful Improvements in Cast Be itxknown that I, YUSKE MIYASAKI, a

Truck Bolsters, of which the following is a specification, reference being bad tothe ac- ;companying drawings. Y

This invention relates to certain improve mentsin cast truck bolsters and is primarily an improvement on the-bolster disclosed in" myreissue Patent-N0. 14,307, dated May 29,;

l 1917, audit is an object of thepresent invention to provide a bolster wherein a plu-i rality of longitudinally extending spaces is formedalong the under side of the bottom {chord of the bolster whereby the cooling rate of the bottom-chord during the casting process may be made equal to that of the" other parts of the bolster to thus minimize a casting detects and shrinkage strain and to simplify-athemoldingprocess; j i a Another ob'ect of the invention is to prfovide a bolster of this kind constructed; andjmolded in a manner whereby the bolster jQ lS-gPIOdRCBdl with ai homogeneous grain of metalfthroughout i f Y nnotl er'object of the m'vention'is to construct a bolster of this kind wherein a portionvof the metal, which would be used to form the part near the neutral axis of the vertical section of the bolster is employed l 1 toform the inner flanges in thetop chord, I 1

andbalance ofsaid; metal is added to the bottom chord to increase the section modulus of the section and thereby produce greater Vertical strength.

WVith the addition of metal to the bottom chord distributed'as far as possible from the neutral axis within the limited depth of the bolster in order to obtain maximum vertical strength will result in increased be; in liquid state when solidification begins excessivedifference inthicknesses and the subjected to excessive shrinkage strain which V cannot be removed-by anannealing process It is anob ect of the nvention .to provide a 7 spaces in thebottomchordwhereby the heat 1 radiatingsurface will be greatlyincreased and herefore ak g it possible to have the scribe the sa prised in Figure 1 a v ure 5;v

' thickness of the bottom chord to such an Q extent that ordinarily the bottom-chord will Application filed March 28, 1925 Serial No.,19,107.

rate of cooling of the bottom chord eeual to that of the other parts of the bolster, re-

sulting in a casting having ahomogeneous grain, of metalzwhich will give increased strength to withstand impact compared with a castinghaving uneven crystallization of metal due to unequal rateoiicoollng, such equalization of the cooling action" also reducing to a-"minimuin the shrinkage strain atjunc'tures and liability ofcasting defects.

The invention' consists in the details of construction andin the combination and arrangement of the several parts of my improved cas't truck bolster whereby certain important advantages are attained and the device rendered simpler, less expensive and "otherwise more convenient and advantageous for use, fully set forth. @The novel features of my invention will hereinafter be .definitelyclaimed. l

f In order that 'my'invention may be the as willbe hereinafter more betterunjderstood, I will now proceed to deme with reference to the accom j panying drawings, wherein i Figure l'isa view in side elevation of a bolster constructed in vaccordance with an embodiment of my invention; a

Figure 2 is a view in bottom plan of one "longitudinal half of the bolster as" com a Figure 3 1s a sectional View taken substantiallyon the line 33 of Figure 1;

Figure ,4: is a sectional view taken substanti'ally o'n-the line 44 of Figure 1; Figure 5 is a fragmentary view inelevation' of thecentral portion of the bottom chord andthe lower portion of the vertical truss illustrating a slightly modified; form of inventionrf Q i i Figure-6 is aifragmentary view in bottom plan of the structure as illustrated in Fig- Figure 7is a View in'top plan of the bolsteras comprised in Figural.

As particularly illustrated in Figures 1 7 inothenparts of the bolster on account of ,top chord Inembenand 2 the bottom chord bottom chord, caused by earlier contraction of metal forming the other parts, will 'be to 4:" inclusive and Figure 7 1 denote s the member. 7 'At "their 'opposite ends the top and bottom chord members 1 and 2 are integrally connected together by the vertical thereonja'nd *the end portions of the upper chordu ner'nber" 1 are provided with the bear ings 5. The p chore mem er 1 and e bottom chord member 2 are integrally connected and braced to resist vertical strains by a'central tubular truss 6.

The top chord member 1 is constructed in 5 substantially the samemanneras disclosed I in my reissue Patent No: 14,3 O7, dated May 29, 1917, including the inner verticalzflagnges 7 and the outer vertical flanges 8.

As is particularlyillustrated iri Figure 3,

10 the bottom chord 2 is of greater thickness thanxthat of the top chord 1 due to the fact 1 Ithat'a porti'onoflthe m'etaL-which would be yformof my invention wherein said ribs 9' -used*to form a part nearthe neutral axis of 1 :the vertical section of a bolster, is added to the: bottom chord whereby 1 greater vertical 3 strength will be=obtainedon accountof the' r creased. I

a The width ofthe' bottom chord 2 and the section modulus of Jlthe section being in- .;overall: depth of the. bolster" are limited on r :1 account of the standard;construction of a 1 truck towhichthembolster iis to be applied,

: and :the addition "of 'met'ali to "the'bottom eChOICl',' 2LS far from theineutralaxis as possible within 1 the limited depth of- =the bolster 11in order to "obtain"maX'-imum 'verti'cal strength,-= will result in the ith'ick-ness of the bottom chord: 2 beingiincreased to such an extent that the bottom chordf 2-'will be, dur-' ing'the' molding process, in liquid statewhen solidification begins; ml the other 1 parts 1 of r, the bolster: on "account foil :the excessive dif- 1 'ference' in thicknesses .andordinarily' the f-"bOtlZOIIT -cl1ord,"ca-used by the earlier contraction of the metal".formingiftheother parts,

- strain which 1 cannot? be -removed by am annealmg process.

are continuous along the underside of the bottom ch'ord 2i and which arrangement is possible when there is suflicient clearance between the low point A of the bolster' and'the art of the truck to which the-bolster is a plied.

Y ln the present embodiment of'rny-invention it is to be u-nderstood that 'theflanges 7 land'- 8 are employed "for the same? purposes as particularly disclosed in my reissue patent hereinbeforereferred to, the efficien'cy' of the bolster being 'fl'irther materially "inerease'd by the particular forms of bottom chord membersherein particularly set forth. Since the patternis drawn upwardly-the moldingprocess is greatly-simplified byproviding i the ribs and sp'aces on the'under side of the bottom chord' member and whi'le I have illustrated in the accompanying drawings such ribs ands'p'acesas extendinglongitudinal ly ofthe bottom chord 'mernbe'r it is to-be understood that said' ribs may be united crosswise wherefiit fisf deemed necessary. to"

provide' such reinforcement. I

i From the foregoing description it is thought to be 'obvi ous'tlrat a cast'truck bolster constructed {in accordance with my in: g ve ntion -is particularly well adapted 1 for use will I I be 's subjected i to I excessive 'sliri'nkage by reason "of the convenience and facility with whichit maybe assembled, and "it will 2 is formed with the 3 under surface provided ith'erea'long with the I 1 separated ribs 9 providing itherebetween the :;spaces 10 whereby :thetheati radiating surface of the bott'omfchord isgr'eatly'increa'sed and therefor'e'making/t-he" rate of'cooling of the bottom'chordequalto that of the other 1 -on.-a111 parts of thejbolster will produce a a homogeneous grain of metal which will give -greater strength to withstand" impact in comparison with a bolster having uneven crystal- -.lizat'ion of. metalid-ue'tolan unequ'alrr a'te of cooling. iThisiequal rate-lof cooling will also reduce to a mlnimum the shrinkageflstrain at junctures: and liability ot casting defects. It is considered to be or decided advantage to castthe' bolster witli'the' chord2': at the ."bottom'of the mold-soithatwhen metal is pouredlinto the mold:the filling starts at the also be obvious that mydnventi'on is susceptible ofsome'ichan-ge and modification with out departing fromthe principles and spirit thereof and'for this reason I' do not-wish to be understood as limiting myself to theprecise arrangement and formationof the several parts herein shownin' carrying out my 7 invention in pIaCtlCEB except as" hereinafter" zapa rts of the bolster. -E'qual :rate' of cooling bers, said "chord members meetingflat the ends of-theb'olster, said bottom- 'ch'o'rd having ribs provided on a face-thereof I affording spaces therebetween.

' 2. "-A"cast truckbolster'comprisinga top chord member and a" bottom chord member,

a central truss connecting saidchord mem- -rually rises towarcl the ends of 'the' bolster.

, Toproperly equalize the rate-of cooling in creased vertical strengthrequiredtoward the] W v x p ends, the-thicknessof the ribs9 is gradually cho'rdinember and abottom ehordmember,

ingribs'providedon a face thereof a-flfording bers,-sa'id* chord members meeting" at the ---lowest point offthe bottom chord 2and gradends of the bolster; said bottom ch'ord havspaces therebetween, said-ribs and intervening spaces being provided" on -theunder 1 side of the bottom chord member.

Acast'truckibo1ster -comprising a top a central truss connecting said chord members, said chord members meeting at the ends of the bolster, said bottom chord having ribs provided on a face thereof aflording spaces therebetween, said top chord member having downwardly disposed flanges at the marginal portions thereof.

4. A cast truck bolster comprising a top chord member and a bottom chord member,

a central truss connecting said chord members, said chord members meeting at the ends of the bolster, said bottom chord havinga plurality of longitudinally extending ribs provided on a face thereof afi'ording spaces therebetween.

In'testimony whereof I hereunto aflix my signature.

YUSKE MIYASAKI.

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