US1986987A

US1986987A - Foundry equipment

Info

Publication number: US1986987A
Application number: US689335A
Authority: US
Inventors: Louis S Trachsel
Original assignee: Chicago Railway Equipment Co
Current assignee: Chicago Railway Equipment Co
Priority date: 1933-09-14
Filing date: 1933-09-14
Publication date: 1935-01-08
Anticipated expiration: 1952-01-08

Description

Patented Jan. 1935 l if "1,986,987

Y v 'LouislSy.`Traehsel,`Franklin, PaiQassignortoChieIl! l 'La cagonailway :Equipment Company, Chicago,

This inventionlrelates: to equipment `for `use in molding and cleaning castingsinfoundries@`1` In order to prevent the lsand in large o-r deep molds from falling away fromthe partingface,` or from the surface of the mold cavity, "it is -customary to insert metalbars called gaggers, in the sand,` which bars are rammed vvithl` the.` pattern.. o The usual form of gagger has` a leg which extends' 4 transversely to the partingfaceof `the moldaid v invention is gripped and ,sustainedlby the sand, "and an angularly disposed toe extending substantially parallel to the parting face fGrVsUstainng-the sand.` `Gaggers have-heretofore been )made `fron; barsof,square,.tiiangular,` or other regular polygonal or: ,curvilinear o section ,andt have ,been provided with*variouslylshapedjnobs, ribs or 1 interstices for improving the sand gripping qualil ties of the gagger. Also `gaggers,` have? been `formed of rods of` flatfsidedlsquareor triangular section twisted to provide ridges extending heli-v,"

cally around the` bar.

Small castings are commonly czleaned` of ing sand after molding byI being placed are-,1l

l volving box` or tumbling barrel together with;`

, l o provide a gagger havinggreater sandfggrippingl v small pieces of metal called foundry stars which strike the castrnetal :during rotation, ljarfring", or breakingloose sand particles. lTheffstarsjfpref erably have sharp'points," "edg`es,'but it is obvi4 `and eventually theedgesbecome.: blunt." Fcnin'dryr stars, for facility in,manufjzzclture` have heretofore o I been "made of diagonallvcut" shortsectionsfof twisted square or otherilat-sided section bars.`

lSuch stars, however, vhavef ratherf,blunt o edges which are quickly dulledLf` `.The stars are also conf` veniently made from the same 4twistedloar stool;

from which gaggers are made.`

'I'he main objectof the pres A provide a novel metal bar stock whichlisfadapted by simple operations to beformed into `gaggers' and foundry stars, both of which,` due to the novel shaping of the stock, constitute substantial provements upon similar devices vlieretofore ln'lown.` n o 1 1" o 1I o `A more detailed object of `the;inizention is o capacity'per unit of weight thanother gaggers1.V

Another detailhobjectis to provide anfimpoved foundry star adapted to longer retain its sharp edges and corners than the stars heretofore in use. l Y

These objects ,and others hereafter appearing are attained by my invention which consists substantially of bar stock of hard materialgpreferably metal, withsides longitudinally grooved,` the bar ous that these. are subject to considerablewear n,

ent inventionisfto 1111, aporporation of- Illinois l `sono;term;issajseriau1519563935' I 7 claims. quizz-1,411) l being twistedin aymanner to cause the grooves andedge ridges toextend helically around the bar substantially nthe'form of a screw thread. Such a bar maytlnen bebent `lil-shaped Vtoiorm a gagger having substantial [advantages over previously known `gaggers, and may alsobelcut, preferably diagonally, ingshort 4sections to form] improved yk in fthe; the

Figure '1" isa isometric view of a portion of one form of` groovedbar, -sfuch as may be`used in formingthefnovel stock,fbefre twisting. l Figurezisa view of a completedgagger. Y"

\ lf FiguresS-to 6, inclusive, are diagrammatic views 4illustrating various grooved shapes which may be utilized inthe. practice of thelinvention.

Figure?, is a perspective viewlof, a foundry star formedfoni the stockk used in forming the gagger mr'i'gure2.1,` o n o o v .t In Figure 1 ofthe drawing is illustrated a portion of a short length v of a four-sided section groovd bar whichstwisted to form the novel bar stock. In Figure`2` the twistedgr'ooved `bar is shown bent L``shapedfto` form a gagger and in-1 cludes a leg 1 `which is usually disposed `in the mold `at angle to the parting'face and issus-` tainedbythe sand and atoe 2which f extends substantially parallelwith the parting face and constitutesgthe sandsustaining portion.

InyFigureBinsolid lines and Figures 5 and 6 are'shownfendfviews ofgrooved bars of various kshapes which may. be 'advantageously' used in forming thejgagger.' "Figure 3 represents atY 3 a grooved fourl'sided bar,"as'in Figures 1" and 2, `and Figures 4, 5and 6 represent, respectively, grooved threesided," groovedA relatively flat,` Vand star section bars, the star section bar being vconsidered as of four-'sided section "withdeep longitudinal re-Y f:les"se`s.` In thesefigures is also illustrated in section approximately the amount of sand that would be breached from, the mold if the gagger were` o l withdrawnwithoutbeing rotatedl 1 o "I'he'helical ridges of the twisted `bar form, in effect, screw threadsand thesand gripping power of`a`gag'g`erfformed from such abar is equal tothe n fofrcerc'quired `toshearoif from the surrounding rammedV sandV Ythe helicoidal masses' of sand between the ridges or threads which are breached outwhen the gagger is withdrawnfrom the mold without turning. The total area of surface sheared approximately equals the surface area` of the broachedcylinder and, accordingly, the

sand gripping powerof the gagger is proportional to the size of this cylinder or, in other words, the

` scribed within the same circle, the gagger having Obviously, as between gaggers of equalareas o f.

cross sections, the gagger inscribed'within the largest circle will have the greatestgsandgripping;v

capacity.

To illustrate the above, in superimposed upon the representation of the grooved.

four-sided section bar, are shown in broken lines a square, at fl, and an equilateral triangle, at 5,'.

having the same areas as the solid line figure. If the broken' lines are kassumed to `represent gagger cross sections', it will be seenthat the `grooved four-sided gagger willbroach-outa cylindery of greater circumference"`and;" accordiiriglyb have greater gripping powerthianthetplain side square gagger, Ihe grooved four-sided-,gagger will have approximately the same grippingcapacityfasthe triangular plain side gaggershowinl `f The grooved bar "shapes sh'owhin Figures 4,1' 5, and B will allform gaggers more economical and more' eiicient than bars similarly' shaped but with ungrooved'plainsides. "T Ihebar in Figur'e Bris of star-section, Y according to the popular understanding of "the term'JAstarlfwhen-"applied to shapesj'that'fis, the section of the bar-basa series of points or salients disposed around its periphery.v The "sktar-.section lbar may be considered' a form 'of longitudinally grooved' bari Alated bars having any nuinberof wings or ribs may also be used. Obviously, theV depth and shape Hof the grooves lor. "longitudinal recesses `between the ridges/fare limited 'only' by manufacturing expedientsand the strength of the metal.y As a genera-l proposition', the longitudinally A'grooved bars, V if sumciently deeply grooved',""lforn more eicent andeconomical gaggers of .the twistedv type than plain sidebars.' f 'l y l a j .,'The'ga'gger may be formed'Z-sha'ped, hooked, or of any, other suitable shape. In anyv case', the sand v'.'sustaining' toe or vhook. portionof Athe gagg'er will function' better when .helically recessed asdeeply asis expedient. This is'because the helicoidal masses of vsand between V'the ridges serve to sustainfthe sand'direfctly beneath the toe portion.v f,

The nveltwisted grooved bar stock may also be cut in shortjsectifons illustrated in'Figure 7, and advantageously used as foundry stars; Preferably, though not necessarily vthe'jtwisted bar is cut alongdiagonal lines' for this purpose.`A AS prefviouslyfsuggested, it is desirable that ifoundr'y stars havefrelatively sharp edges and/or 'points in order to more eiectuall'y" dislodge .sand par-- ticles clinging to the castings'. Due tothe grooving V ofthe metal, the edges and` points of the stars, formed of the novel bar stock, will be 'sharper'than where the stars `arejcut from bars of regular polygonal section and also the edges Ywill retain their sh'arr'aness` fora longer period of use.

Such stars are, therefore, improvements over stars heretofore in use, and may be readily formed from the novel twisted grooved bar stock described above.

The novel bar stock forming the subject of the present invention may be formed of a bar o f substantially any number of sides grooved longitudinally and twisted about its axis. rlihe novel grooved, twisted bar may also be advantageously used in straight or otherwise shaped lengths as La' core rod or in other instances where it is desired to. support, reinforce, or anchor a body of packed granular material such as sand. In all such cases, .due to.itsjdistinctivecontour, the grooved, twistedxbarwiilfnnctinnbetter than previous types of bars applied to similar uses. The bar also has advantages irrespective of its sand sustaining qualities,y fr instance', when used as an element of fa grating tread. The invention is otherwise not limited to the exact details of the embodiments shown, but may be varied' aspreviou'sly suggested, and exclusive nse of all such r'nodiiications as come within the 'scope ofthe appendedclaims is contemplated. I i

' Y1'. A gagger for use in foundry moldsjcomprisr ing'aportion to be sustained by the lsand in the mold and formed of a multi-sided bar twisted aboutits `axis with its sides `longitudina'lly grooved and forminghelices,y and aportion disposed atan angle "to" said first mentioned portion for sustaining the sand. a i

' r2.; A gagger for use infoundry molds'comprising an L-shaped multi-sided bar of Auniform cross section with its sides grooved, the bar being twisted to cause thegrooves to extendhelically around the axis of the bar. A y

13. A gagger for use in foundry 'molds and formed of a bar with a longitudinal recess inits surface, said `bar being :twisted to cause therecess to extend helicallyaround the bar axis and being bent in the shape of van L to form' a sand retainingleg and a leg ladapted to be gripped by the v Sandi s 4. A gagger comprising va four-'sided L-shaped bary with its sides longitudinally lgrooved and twistedto cause the grooves to extend around the bar.

'5. Aj gagger comprising Ia'three-sided L-shaped bar with its sides .longitudinally Vgrooved and twisted to cause the grooves to' extend around the bar. l

,6i A member for` sustaining, reinforcing oranchoring a body of packed, granular materiall and comprising a multi-sided vbar with its'sides concaved transversely of the bar and forming longitudinal grooves, the bar being twisted toy cause s'aid grooves to ,extend helically therearound and the bar being bent substantially atright angles intermediate its ends to v:form a material-sustained ypart, and a material-sustaining part suspendedtherefrom.

7. A molders gaggercomprising a bar twisted about its axis and bent into an L-shape, the cross-section of the bar resembling a'star in 'having a; plurality of apices 'with concave side faces between said apices.

LOUTS S; TRACHSEL.