US2129164A

US2129164A - Type casting machine

Info

Publication number: US2129164A
Application number: US160432A
Authority: US
Inventors: Rutherford B Chase
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-08-23
Filing date: 1937-08-23
Publication date: 1938-09-06
Anticipated expiration: 1955-09-06

Description

Sept 6, 1938. R. B. CHASE TYPE'GASTING MACHINE Filed Aug. 23, 1937 n. nl..

Patented Sept. 6, 1938 UNITED STATES PATENT OFFIQE 2 Claims.

. to accomplish movement of the crucible with respect to the reservoir to thereby facilitate access to certain elements of the reservoir and thus reduce the time consumed in removal and replacement of these elements for the purpose of cleansing said elements.

It is an additional object of the invention to construct the crucible so that it may readily be associated with the type casting machine and be bodily removed from the machine.

It is another object of this invention to provide a crucible having the above characteristics with means for regulating the feeding of the metal from the crucible to the reservoir in accordance with the amount of metal withdrawn from the reservoir, this means being automatically operable to prevent feeding of metal to the reservoir to thus allow movement of the crucible relatively to the reservoir and other elements of the type casting machine without fear of the dis- V charge of molten metal and consequent injury to o" the Workman whose duty it is to maintain the machine in proper condition.

It is an object of the invention to` provide the crucible with means such as a iioat or other device operable by the amount of metal in the reser- Voir to control feeding of the molten metal from the crucible and to combine therewith means for rendering the iioat ineffective to operate the valve and permit the latter to automatically close and lthus prevent accidental discharge of metal from the crucible when the latter is moved out of cooperation with the reservoir to expose the above mentioned elements of the type casting machine.

It is a further object of the invention to provide means whereby the float may be arranged in the manner and for the purpose just referred to, and thus allow unitary movement thereof with the crucible.

It is another object of the invention to provide a separable connection between said float andthe valve for controlling flow of metal from the crulible to thus allow the crucible to be moved with respect to the float to thereby provide means which compensates for a condition preventing unitary movement of the float and crucible.

The invention has these and other objects all 0f which will be explained in detail and more readily understood when read in conjunction with the accompanying drawing which illustrates one embodiment of which the invention is susceptible, it being understood that the changes and modications may be resorted to without departing from the spirit of the appended claims forming a part hereof.

In the drawing, Fig. 1 is a side view of a portion of a type casting machine showing the device applied thereto.

Fig. 2 is a perspective View of the crucible shown in Fig. 1.

Fig. 3 is a sectional view taken on line 3 3 of Fig. l.

The invention is designed primarily for use with a type casting machine and particularly with the reservoir which supplies metal to the molds. Machines of this character include a reservoir, having a pump for feeding molten metal to the mold, this pump requires daily attention and removal from the reservoir for cleansing purposes. The crucible which supplies molten metal to the reservoir is stationarilly mounted with respect to the reservoir and other elements of the type casting machine it being bolted in place thus requiring complete separation from the type casting machine in order to accomplish access to the pump in order to cleanse the latter. This operation Consumes a period of time which is materially reduced by the structure herein shown and described. This reservoir is designated i@ and involves the use of the pump generally designated i I having a pump shaft l2, the latter being connected with one arm such as i3, of the bell crank lever generally designated M. This bell crank lever has an arm l5 which is provided with a roller i6 for cooperation with the cam il, the latter causing movement of the bell crank lever and actuation of the pump il. The cam il drives the bell Crank lever in one direction it being actuated in the opposite direction through the agency of the Coil spring I8. This bell crank lever is pivotally connected at I9 to the bracket generally designated 2li, which is secured to the main frame of the type casting machine. This bracket 2i] has an apertured boss 2l provided for the reception of the mold disc lever shaft of the type casting machine, this shaft is removed and the crucible hanger 22 is substituted therefor. This hanger 22 supports the crucible 23 for swinging movement. Usually those structures employed for melting the metal and bringing it to a iiuid state, so that it i may be fed to the reservoir or melting pot li), are stationarily mounted with respect to the type casting machine and thus require separation and disassociation from the main frame of the type Casting machine before access may be had to the pump and pump shaft, thus making it diiiicult and more or less laborious in order to permit of access to the pump and pump shaft respectively designated il and I2 to accomplish cleansing of these elements. Since these last mentioned elements must be cleansed at least once a day, it becomes obvious that considerable time is lost in performing this necessity and that by providing a structure which may be readily moved with relation to the reservoir or melting pot lll without removal or disassociation from the type casting machine, accessibility to these elements is more conveniently effected, which reduces the time period necessary in order to remove and cleanse the elements of the pump such as li and l2. The crucible generally designated 23 is provided with means 24-24 which are passed over the end of the hanger 22 and thus provide means whereby the Crucible is hinged, permitting said crucible to be arranged in a position relatively to the elements H and i2 in a manner to facilitate accessibility to them to accomplish their removal from the reservoir MJ.

The crucible generally designated 23 consists of an outer casing 25, and a melting pot 26, which are insulated from each other through the medium of the insulation 2. The outer casing 25 extends below the bottom of the pot 25 and provides a housing for a heating element generally designated 28, which in the present instance consists oi a gas burner having the regulator 29, the valve 3l) and the hose connection or nipple 3 l.

The structure just described includes a cover generally designated v32, consisting of two elements respectively designated 33 and 34, the latter being hinged at 35, to permit this portion 34 of the cover to be moved to allow metal slugs and shavings to be introduced to the crucible. The portion 33, is provided with a vent opening 36, to allow escape of fumes from the interior of the crucible. The bottom of the pot 26 is provided with a tubular extension 3l' which provides an outlet from the pot 25 of the kcrucible to feed metal to the reservoir l0. This tubular extension 31, is provided with the valve seat 33, with which the needle: of the valve 39, is adapted to coopera-te, to control the flow of metal through said valve. The stem 40 of the needle valve 39, is mounted for guidance in the member 4i and said stem is connected with the lever arm 42 at 44, said lever arm being pivoted at 43. The lever arm 42 projects beyond the casing of the crucible and is connected with the float rod 44, the latter being provided with a float 45 which is arranged in the melting pot or crucible iii and is provided to actuate the needle valve 39, in accordance with variations in depth of the molten metal contained in the melting pot or reservoir Il). The float rod generally designated 44 is comprised of two sections 46 and 4l, which are connected with each other through the agency of the turn buckle 48, which provides means for varying the position of the float in the reservoir. The iioat rod 46 is connected with the lever arm 42 through the agency of a separable connection 49, to thus disconnect the iioat and lever and allow the valve 39 to automatically close.

To provide the separable connection just referred to, the upper extremity oi the section 46 is formed with an` eyelet 53, which is passed over the end lever arm 42, it being held in the position thereof shown in Fig. 2 through the agency of the separable pin 5l. It will be noted that one portion of the arm 42, such as that extending between the stem 4B and the pivot 43, is of a greater length than that portion extending from the pivot 43 to the float rod, and thus when the connection between the lever 42 and the rod 44 is separated, the valve comprised of the seat 38 and needle 39 will be automatically Closed and thus prevent escape of molten metal from the crucible when the latter is moved from the position thereof shown in Fig. 1, to a position to expose the elements such as the bell crank lever I3 and the piston shaft l2.

Means is provided for locking the valve lever arm 42 in this last mentioned position. This means in the present instance consists of the element 52 which is pivotally connected to the cover of the crucible at 53 it being movable Crosswise of the lever arm 42, and parallel therewith to thus lock and release the lever arm. Means is provided to guide the lower end of the oat rod generally designated 44. This means is designated 54 and is in the present instance formed of a pair of spring fingers 55,- which will allow the Crucible and other elements such as the lever 42 to be disconnected from said float rod and be moved in unison with relation to the float rod 44, should a condition at any time exist in which the float rod is held in the reservoir against movement with the crucible. Manifestly the structure just referred to will also allow the oat and rod to be separated from the crucible and be removed from the reservoir should this be found desirable.

The invention also contemplates the provision of means whereby the float rod and the iloat may be removed from the melting pot or reservoir i and be held in an elevated position, to thereby allow the oat rod to be moved in unison with the crucible, when the latter is moved upon the pivots 24-24. To this end a forked spring bracket 56 is provided for the reception of the float rod 44, after the connection generally designated 49 has been uncoupled, it being understood that the iloat and iioat rod 44 are elevated and arranged with respect to the spring element 56 so that a portion thereof such as the turn buckle is arranged for Cooperation with the element 55 to thereby hold and retain the float and float rod in an elevated position which thus allows unitary movement of the iioat and iioat rod with the Crucible as above explained.

The heating element generally designated 28 is provided with a tubular extension 5l which is arranged adjacent the feed pipe 31, to thus heat said pipe 3T and thus melt any solidified metal left in the crucible from the previous. days operations.

From the foregoing explanation of the invention it is believed manifest that an arrangement is provided whereby the crucible may be positioned to feed molten metal to the reservoir I0 and in addition may be moved with relation to the reservoir and other elements of the type casting machine so as to expose the bell crank lever i3 and the pump shaft i 2 resulting in greater ac- Cessibility to these last mentioned elements and a saving in time to accomplish cleansing of the pump Il.

It is further manifest that when movement of the Crucible 23 relatively to the reservoir I0 is desired, and the oat is lifted from the reservoir, or the connection between the float rod and valve mechanism is separated the valve controlling ow of metal through the pipe 31 will automatically close, which thus eliminates the possibility of escape and burning of the person or operator whose duty it is to maintain the pump I I in an operable condition.

It is further manifest that the separable connection provided between the float rod and the valve mechanism provides means whereby the crucible may be moved with respect to the reservoir I0 with the metal in the reservoir I0 in a solidified condition should the float have been inadvertently left in the reservoir I0.

Having thus described the invention what I claim and desire to cover by Letters Patent is:

l. In combination with a type casting machine including a reservoir arranged to deliver molten metal thereto and a crucible pivotally mounted to said machine and adapted to feed molten metal by gravity to said reservoir, a oat actuated valve for controlling the feeding of the metal to said reservoir, said valve and its actuating mechanism being mounted upon and carried solely by the crucible to swing out of operative position when the Crucible is pivoted with relation to the reservoir, safety means for positively closing said valve before the crucible can be swung out of its operative position, and a lock for maintaining said valve in its closed position and against accidental opening while the Crucible is outside of its operating position. 1 y

2. In combination with a type casting machine including a reservoir arranged to deliver molten metal thereto and a crucible pivotally mounted to said machine and adapted to feed molten metal by gravity to said reservoir, a heater arranged to supply heat to said crucible, a float actuated valve operable from the reservoir for controlling the feeding of the metal from the crucible to said reservoir, said valve and its actuating mechanism being mounted upon and carried solely by the crucible to swing out of operative position when the crucible is pivoted with relation to the reservoir, safety means for positively closing said valve before the crucible can be swung out of its operative position, and a lock for maintaining said valve in its closed position.

RUTHERFORD B. CHASE.