US1309534A - Leo manbelstamm - Google Patents

Description

METAL CASTING MACHINE.

APPLICATION HLED 1AN.2|. 1919.

1,3 O9,534y Patented .my 8, 1919.

A TTORNEYS LEO MANDELSTAMM, OF NEW YORK, N. Y.

METAL-CASTING MACHINE.

Specification of Letters Patent.

Patented July 8, 1915).

Application filed January 21, 1919. Serial No. 272,305.

To all Hw/)L 'it 'may concer/n.'

Be it known that T, Liao l\I.\.\'m:is'r.\.\|.\i, a citizen of the United States7 and a resident of the cit)Y of New York, borough of Manlhattan. in the county and State of New York. have invented a new and Improved B'Ietal-(asting Machine, ot' which the following is a full. clear. and exact description.

This invention relates to n `ans and method .for casting precious or other metals and has particular reference to dental work in the making of plates or teeth Afrom gold or the like.

A\mong the objects of the invention theret'ore is to improve the Vfacilities t'or making a cast Ot' precious metal` which obviously is frequently o't' very small capacity. aml which consequently is extremely diflicult to perform under methods or by the use oll means ordinarily practised.

More specifically stated my invention includes the provision of a cup or receptacleI for holding the mold or investment. and above it the metal which at'ter being melted is to be delivered into the cavity .formed in the mold. My apparatus also includes a plunger s0 arranged and constructed as to be brought down over the molten metal to force the same into the'cavity while the metal is still in a molten state.

lVith the foregoing and other objects in view the invention consists in the. arrangement and combination ot' parts hereinafter described and claimed, and while the invention is not restricted to the exact details of: construction disclosed 0r suggested herein, still for thel purpose of illustratingr a n'actical embodiment thereof reference is lad to the accompanying drawing which is a vertical View partly in elevation and partly in section.

Referring now more specifically to the drawing show an apparatus comprising a base 10 having a depression or pit 1l. t'or holding a strong hollow receptacle or flask 12 having a cavity in which a mold or investment ot' plastic material 13 is made or placed. For some metals the investments are Very expensive and for casting large plates or the like much heat and time are required. Hence I provide a casting machine whereby I may use a small flask for small casts with ready interchange from one size to another, and yet with a plunger .suitably designed for direct coperation with flasks of all standard sizes without interchange ot' plungers. The receptacle 12 may include a metal top 1l that may be removable from the main portion ol the receptacle to facilitate the introduction otI the mold. As to the particuhn' manner. however. ol constructing a receptacle oil a separable nature .l do not wish to be unnecessarily limited. It is to be noted. however. that the top portion l-t ol' the receptacle is provided with a concavity for holding the metal indicated at r/ while it is being melted. and from which the mollen metal is subsequently to be `forced or driven through a hole l-l `formed in the bottom of the top member 1l aml registering with a by-pass lli leading to the cavity in the mold for the purpose oi' filling the cavity.

Fixed in any suitable lnanner lo the base and extending therefrom is an uprightstandard l5 preferably ot' cylimlrical torni lor reasons soon to appear.

lf isa hollow cylindrical collaradjustable up and down along the standard lo any desired height and adapted to be secured in fixed position by a set screw lT or its equivalent. 'l`his collar might be ol' other l'orm than c vlimlrical` but preferably it is l'ormed as shown so as to l'acililate the :uljustment and lockingr thereof with respect to the standard.

1H is a plunger comprising two main parts namely a bonnet lf) and a shank 2l). 'l`he bonnet comprises a strong shell 21 having an opening in its bottom sulliciently large to lrcely admit the lop ol' thel receptacle lL. Otherwise the shell 'il is imperl'orate or closed. and the shank z2() is secured to the top thereotl by any suitable rigid means including a cap 22 and pin 22%. The cap is so constructtal as to possessalnple stiffness for the purposes of the. press.

An arm 2t is swiveled upon the standard l5 just above the collar lo and is adapted to be swung around the axis ot the standard as well as being adjustable vertically along the cylindrical upper end ol.` the standard. The arm .Zllincludes a sleeve J5 having a set. screw 26, or its equivalent, through which the arm may be, locked from rotation around the standard 'l5 it' desired. At the opposite end of the arm is a sleeve 27 in which the shank 2O is slidable t'reely. Between the sleeves Q5 and 27 there is fitted to the arm an upstanding finger 9.8 constitilting a vFulcrum or second class lever :'29, thel lever being pivoted to the finger through a pin 30. At 3l the lever is pivoted through a` pin and slot connection to the upper end of the shank 20. Between the shank 20 and the finger 28 is a spring 32 having a normal tendency to expand and elevate the lever swinging it upward around the pivot pin Si 'lhe lower end of the spring is seated in a lsocket while the upper end ot the spring embraces a stud 3l fitted into the lever; thus the spring is held trom lateral displacement with respect to either the arm or the lever.

The shell 2l ot' the plunger is densely packed and filled with some suitable retractory material such as asbestos or mineral wool indicated at P35. The operation of my casting` press may be brieliy sunnnarized as `follows: ln view ot' the foregoing specificv description according to the. height of the receptacle l2, the plunger and supporting means therefor are adjusted at such a height on thestandard l5 as to just permit the bottom ot' the plunger to pass freely over the top ot the receptacle when swung around the standard. rlhis preliminary adjustment is etieeted mainly by the adjustment of the collar 16, and then is fixed by the set 'screw t7. lt the screw 26 is loose it is obvious that the plungei.' and parts associated therewith may be swung freely in a horizontal plane either over or to one side of the receptacle. lt to be understood in this connection that the spring acts automatically to elevate the plunger and hold it in elevated position except when the outer end of the lever is depressed forcibly. lilith the plunger swung to one side and with the receptacle l2 in place and lilled with the mold as indicated the metal to be melted is placed in the concave top of the receptacle and is then subjected to sull'icient heat to melt it, such as might be furnished with an ordinary blow pipe, er its equivalent. When the metal is melted the plunger is swung in a horizontal plane around the axis of the standard to bring the open bottom of the shell 2l directly over the receptacle, and the arm may be locked in this position if desired by tightening the screw 26. l/Vhether locked or not, however, the operator may then depress the outer end of the lever forcing the plunger downward against the tensionof the spring 32 and causing the asbestos packing 35 to bear directly downward upon the molten metal and torce it through the small holes l and 13 into the mold cavity. Urdinarily the molten metal ldoes not iiow downward through such small holes without being forced. The metal does not etl'ect the packing 35 in the shell. and hence fo a similar work the saine equipment may be used repeatedly. lVhen'the casting has been made the spring 32 will elevate the plunger to its normal elevated position acting upward upon the lever Q9 so that the plunger is free to swing laterally out of the way.

l claim:

In a. casting press of: the character set forth, the combination with a flask or receptacle adapted to contain an investment of a size proportional to the cast to be made and having a concave top to hold the metal to be cast, a plunger movable in a horizontal. plane into position close over the flask and molten metal in the top ot the flask, said plunger comprising a drum-like shell of larger diameter than any flask used and having an opening in its bottom and being completely n'lled withv "compressed fibrous refractory material adapted to come into direct contact with the molten metal, and means to torce the plunger dow'nwardv to drive the molten metal into the cavity in the investment.,

LE() lllANDELS'lAB/M.

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