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Publication numberUS3854832 A
Publication typeGrant
Publication dateDec 17, 1974
Filing dateJan 15, 1973
Priority dateJan 15, 1973
Publication numberUS 3854832 A, US 3854832A, US-A-3854832, US3854832 A, US3854832A
InventorsCowper G
Original AssigneeCaterpillar Tractor Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Handling rod assembly for investment casting mold
US 3854832 A
Abstract
A handling rod assembly comprises a rod having a connecting lug detachably mounted at its lower end to provide a drive connection between the rod assembly and a wax pattern pre-attached to the lug. The lug is detachably connected to the rod assembly by a bayonet connection and a pair of drive lugs which cooperate to prevent axial and rotational movement of the lug relative to the rod during spinning thereof. A coil spring is mounted on the rod to retain the drive lugs in driving engagement during such spinning.
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United States Patent Cowper m] 3,854,832 1451 Dec. 17,1974

[ HANDLING ROD ASSEMBLY FOR INVESTMENT CASTING MOLD [75] Inventor: Glenn Sherwin Cowper, Metamora,

Caterpillar Tractor Co., Peoria, 111.

Jan. 15, 1973 Assignee:

Filed:

Appl. No.:

US. Cl 403/349, 164/235, 403/354 Int. Cl. B25g 3/28, B22c 7/00 Field of Search 403/349, 354, 315, 316,

References Cited UNITED STATES PATENTS 10/1927 Davis 403/35 4 10/1942 Strunk et a]. 403/349 X 2,901,258 8/1959 Brandaji .1 403/349 X Primary Examinerl-l. Hampton Hunter Attorney, Agent, or Firm-Phillips, Moore, Weissenberger Lempio & Strabala [57] ABSTRACT A handling rod assembly comprises a rod having a connecting lug detachably mounted at its lower end to provide a drive connection between the rod assembly and a wax pattern pre-attached to the lug. The lug is detachably connected to the rod assembly by a bayonet connection and a pair of drive lugs which cooperate to prevent axial and rotationalmovement of the lug relative to the rod during spinning thereof. A coil spring is mounted on the rod to retain the drive lugs in driving engagement during such spinning.

7 Claims, 2 Drawing Figures PATENTEU DEC] 7 I974 sum 2 o 2 HANDLING ROD ASSEMBLY FOR INVESTMENT CASTING MOLD BACKGROUND OF THE INVENTION Automated handling apparatus for making ceramic shell molds normally comprise a handling rod assembly, including a connecting lug embedded in a wax cuff having a wax pattern secured thereto. The lug is threadably connected to an elongated rod of the rod assembly during formation of the mold, wherein the wax pattern is repeatedly dipped in a ceramic slurry to form a ceramic shell mold therearound. During such formation, the wax mold is elevated and twirled to evenly distribute a coating of the ceramic slurry therearound and to permit the run-off of excess slurry.

The mold is then rapidly spun in alternate directions for final removal of excess slurry and is thereafter dipped in a fluidized bed for drying purposes. Such spinning and abrupt reversal of the rod assembly tends to unscrew the threaded connection between the rod and the lug. In addition, manual threading of the rod and the lug together is unduly time-consuming, particularly when used in connection with high-speed auto,-

mated handling apparatus wherein time is of the essence.

SUMMARY OF THE INVENTION BRIEF DESCRIPTION OF THE DRAWINGS Other objects of this invention will become apparent I from the following description and accompanying drawings wherein:

FIG. 1 is a front elevational view of a handling rod assembly, having a cast cuff and pattern attached thereto; and

FIG. 2 is an exploded, isometric view of the handling rod assembly.

DETAILED DESCRIPTION FIG. 1 illustrates a handling rod assembly operatively connected to a wax pattern 12, simulating the crankshaft ofa fuel injection pump, by means ofa cast cuff .13. The cuff may be cast from any suitable material, such as wax or aluminum, and suitably secured to the upper end of the wax pattern. When the pattern and the cuff each constitute a wax material, thay may be bonded together at the wax interface therebetween.

A connecting lug 14 has an irregularly shaped head 15 formed thereon for embedment in the cast. cuff. The head thus provides a drive connection between the lug and cuff to rotate pattern 12 during formation of a ceramic shell mold thereon. The lug further comprises a bore 16 formed centrally therethrough to intersect a pair of diametrically opposed bayonet-type locking slots 17, each comprising a vertically disposed portion 18 and an intersecting horizontally disposed portion 19, closed at one end thereof. A pair of diametrically opposed driving and locking tabs 20 are formed on the lug to extend upwardly therefrom and in circumferentially spaced relationship relative to locking slots 17.

Referring to FIG. 2, the handling rod assembly further comprises an elongated rod 21 having attachment means 22 formed on its upper end, adapted to attach the rod assembly to clamping fingers (not shown) of standard automated mold handling apparatus. A mold attaching end 23 of the rod comprises a cylindrical portion 24 terminating at its lower end at a reduced extension 25 and at its upper end at an annular flange 26. A hole 27, formed transversely through rod-portion 24, has a drive pin 29 press-fitted therein to have its free ends project radially outwardly from the rod.

A hole 30 is formed transversely through extension 25 and has a locking pin 31 press-fitted therein. The

21 and for preventing axial movement therebetween. A

locking sleeve 32 is telescopically mounted on cylindrical portion 23 of the rod and has a pair of diametrically opposed and elongated slots 33 formed longitudinally therethrough.

As shown in FIG. 1, each of the slots receives a free end of pin 29 to form a lost-motion connection therebetween for permitting limited axial movement between the sleeve and rod, but for preventing relative rotation therebetween. A coil spring 34 is normally compressed between flange 26 and the upper end of sleeve 32 to provide releasable retaining means for bi asing the sleeve downwardly on the rod to ensure continuous axial engagement of locking tabs 20 in a pair of axially opposed and mating locking slots 36. Such tab. and slot arrangement thus comprise anti-rotation means, along with pin 29 and slot 33 for preventing both clockwise and counter-clockwise rotation of lug 14 relative to rod 21. During an investment casting process, lug 14, having pattern 12 and cuff 13 pre-attached thereto, is selectively connected to rod assembly .10 to facilitate forma tion of a ceramic mold on the pattern in the manner described above. In particular, sleeve 32 is manually retracted to compress spring 34 to expose extension 25 of rod 21 for telescopic engagement in bore 16 of connecting lug l4. Thefree ends of lock pin 31 are then inserted into vertical slot portions 18 of locking slots 21 and the rod and lug are rotated relative to each other to seat the ends of the lock pin in-the closed ends of slot portions 19. v

Sleeve 32is then released to allow locking slots 36 to engage locking tabs 20 to aid in preventing rotation of a rod having attachment means on its upper end adapted to attach the rod assembly to mold handling apparatus,

a casting connecting lug having an irregularly shaped head,

coupling means detachably connecting said lug to a lower end of said rod assembly and for preventing axial movement of said lug relative to said rod, and

anti-rotation means for preventing both clockwise tab and slot connection formed on axially opposed ends of said lug and said sleeve.

4. The handling rod assembly of claim 3 further comprising an annular flange secured on said rod and a normally compressed coil spring mounted on said rod between said sleeve and said flange.-

5. The handling rod assembly of claim 3 wherein said anti-rotation means further comprises a pin secured to I said rod to have an end thereof project radially through at least one side of said sleeve.

6. The handling rod assembly of claim 5 further comprising an elongated slot formed longitudinally through said sleeve to receive the end of said pin therein to form 'a lost-motion connection permitting limited axial movement, but for preventing relative rotation between said rod and said sleeve.

7. The handling rod assembly of claim 1 wherein said coupling means comprises a bayonet connection.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1645802 *Jun 9, 1925Oct 18, 1927Lewis F DavisDeep-well pump-plunger attachment
US2299357 *Dec 22, 1941Oct 20, 1942Breeze CorpCoupling for rods and tubes
US2901258 *Sep 30, 1957Aug 25, 1959Gabriel BrandafiDrill press spindle
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4007929 *Apr 18, 1975Feb 15, 1977Rubin FigaCollapsible game racket
US4064927 *Nov 11, 1976Dec 27, 1977Caterpillar Tractor Co.Standardized investment mold assembly
US4175392 *Apr 6, 1977Nov 27, 1979Nissan Motor Co., Ltd.Tandem master cylinder assembly
US4661009 *Mar 12, 1986Apr 28, 1987Grentek, Inc.Quick change coupling for machine tool arbors and the like
US4708511 *Jul 23, 1986Nov 24, 1987Motorola, Inc.Axial movement blocking apparatus
US4711596 *Feb 3, 1986Dec 8, 1987Werkzeugmaschinenfabrik Oerlikon-Buhrle AgApparatus for securing a connection
US4810126 *Jul 5, 1988Mar 7, 1989Allied-Signal Inc.Compact oil slinger and spring loaded retention device
US4943182 *Mar 14, 1989Jul 24, 1990Ecia - Equipments Et Composants Pour L'industrie AutomobileRapid fastener of the bayonet type
US5002418 *Dec 9, 1988Mar 26, 1991Vsi CorporationHold down device with extended capture pawl mechanism
US6840141 *Jan 9, 2003Jan 11, 2005Brian T. ColeRadial indexing head tool with floating splined pin
US7137355 *Oct 15, 2005Nov 21, 2006Doskocil Manufacturing Company, Inc.Self-cleaning pet litter apparatus with rotating rake and pan
US7156003Jan 11, 2005Jan 2, 2007Cole Charles ARadial indexing head tool with floating splined pin
US8002491 *Mar 27, 2008Aug 23, 2011Ge-Hitachi Nuclear Energy Americas, LlcSmall handling pole locking assembly
US8424845Jul 21, 2009Apr 23, 2013Indexable Tools, LLCHammer and crowbar with adjustable claw
US8490250Dec 5, 2011Jul 23, 2013Tcm Consulting LlcInterlocking extension poles and tool holder
US8533947 *Oct 28, 2010Sep 17, 2013Pcc Airfoils, Inc.Method of forming a turbine engine component
US8916821 *Oct 12, 2010Dec 23, 2014Perkinelmer Health Sciences, Inc.Assemblies for ion and electron sources and methods of use
US20110085852 *Oct 8, 2010Apr 14, 2011Keith FerraraCoupling devices and source assemblies including them
US20110089333 *Oct 12, 2010Apr 21, 2011Keith FerraraAssemblies for ion and electron sources and methods of use
US20120102735 *Oct 28, 2010May 3, 2012Moreland Thomas RMethod of forming a turbine engine component
Classifications
U.S. Classification403/349, 403/354, 164/235
International ClassificationB22C9/04, B22C7/02, B22C7/00
Cooperative ClassificationA63B59/0044, B22C7/02
European ClassificationB22C7/02
Legal Events
DateCodeEventDescription
Jun 12, 1986ASAssignment
Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905
Effective date: 19860515
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905
Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS