Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1984-11-20
1986-10-07
Godici, Nicholas P.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164213, 164241, B22C 2500
Patent
active
046153748
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a foundry plant with a manoeuvring apparatus for automatic manoeuvring of loads in the form of heavy, movable or exchangeable parts incorporated in the plant, such as core masks, pattern plates and core box parts, said manoeuvring apparatus having a gripper rotatably mounted on a carriage or a slide and having at least two jaws capable of being moved between a rest position and an operative position.
Various forms of manoeuvring devices for automatic core feeding are known, e.g. from the British Patent Specifications Nos. 1 057 548 and 1 144 598 and the Danish Patent Specification No. 144 847. The Danish Patent Specification 125 776 (U.S. Pat. No. 3,901,304) discloses a truck for use in pattern plate exchange in automatic machines for making mould parts. All of these known devices are specialized in the sense that they are only designed to perform a specific function.
The invention is based on the finding that the various functions in the operation of automatic foundry plants, such as core feeding, exchange of core masks and exchange of pattern plates, offer so many points of resemblance that it must be possible to simplify a foundry plant and its operation to some degree by utilizing these points of resemblance, and the object of the invention is to provide such a simplified plant.
This object is achieved in that each of the parts to be manoeuvred by the apparatus is provided with at least two carrier pins disposed on the same side of the part, and that the jaws are designed to engage the carrier pins upon movement from the rest position to the operative position to establish a holding grip and are formed with cutouts or depressions to receive the carrier pins. The standardization brought about by providing all the parts of the plant which are relevant in the given connection as manoeuvring objects with uniform engagement elements, makes it possible to handle all of them with the same manoeuvring apparatus.
The invention also relates to a manoeuvring apparatus for use in the foundry plant comprising a gripper which is rotatably and slidably mounted on a slide and has jaws provided with engagement elements to cooperate with carrier pins on the parts of the plant which constitute loads to be manoeuvred, said jaws being pivotable about their respective shafts on the slide or carriage between a rest position and an operative position by means of piston/cylinder devices. When this apparatus is so constructed that each jaw is connected to its piston/cylinder device through a link whose ends are rotatably connected to the free end of the piston rod in the piston/cylinder device whose cylinder is pivotally mounted on the slide or carriage, and the jaw, respectively, and the end of the link connected to the piston rod is so controlled by a cam means on the slide or carriage that the thrust from the load in the operative position of the jaws causes the end of the link in question to assume an end position, which corresponds to the operative position, in engagement with a blocking portion on the cam means, the thrust with which the load acts on the jaws contributes in keeping these in the operative position so that the jaws are self-blocking in this position and in a loaded state.
In practice, a clear indication of the operative positions of the jaws can be expediently obtained when a cam roller, which is disposed on said controlled end of the link in co-axial relationship with said controlled rotatable connection, engages the cam means, which is formed with an end stop for the cam roller in the operative position of the jaw. Enhanced certainty of the jaws remaining in their operative positions until their cylinder assemblies are activated to move them to their rest positions is obtained when the cam means between the end portion corresponding to the operative position of the jaw and the remaining part is formed with a low ridge, whose apex is formed by a ball spring loaded toward the cam face.
A high degree of manoeuvring freedom is obtained when the manoeuvring apparatus has a preferably b
REFERENCES:
patent: 775374 (1904-11-01), Melvin
patent: 4155401 (1979-05-01), Ettore
patent: 4378835 (1983-04-01), Janke
Dansk Industri Syndikat A/S
Godici Nicholas P.
Siedel Richard K.
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