Chucks or sockets – Radially reciprocating jaws
Patent
1990-09-04
1992-09-01
Schwartz, Larry I.
Chucks or sockets
Radially reciprocating jaws
279132, B23B 3116
Patent
active
051436868
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a chuck with four differential jaws driven by a single operation of four jaws disposed in cross at right angle to hold an object of an irregular shape to be processed with even fixing forces.
PRIOR ART
Conventionally, in a case of machining using a lathe, to hold materials of an irregular shape such as a lozenge, an oblong and the like, specially, processing materials with rough shape and poor accuracy such as materials from gas-cutting, forging or casting, a single chuck with four jaws must be used, where, each of the jaws must be operated independently, requiring high skilled experiences for the centering, and moreover, more time are required compared with the case using a scroll chuck or a three- or two-direction fixing power chuck, resulting in considerable deteriorating of productivity.
Then, the present applicant has invented a power chuck with co-operating four jaws of a type of power-driven capable of differential and centripetal operations in two directions, and applied for a patent in Japan. The application was granted and registered as a patent right of Japan No. 1440379.
Said chuck is capable of fixing and machining materials of an irregular shape, for which a single-type chuck must be used so far, without any skilled experiences, and by a single operation, and requires almost same operating time compared with the conventional three- or two-direction fixing power chuck to render increasing of productivity.
For the power chuck described above, however, in order to hold a more complicated irregular object, in a case of two point inward fixing and two point outward fixing using 4 jaws disposed in cross at right angle, an alternative chuck body suitable for the holding type must be prepared and exchanged, and when the object is held in one point positioning or two point positioning system, a problem occurred that a single-type chuck with four jaws must also be used or a separate tool therefor must be used.
In the meantime, the present applicant completed another invention of a manually driven chuck with co-operating four jaws of a type of differential and centripetal operations in two directions capable of centering and holding an object of irregular shape with ease as a three-direction fixing scroll chuck and filed a patent applications in Japan as patent application No. 4530/1987 (publication No. 174805/1988, granted on Dec. 5, 1989), No. 4531/1987 (publication No. 174806/1988), and No. 4532/1987 (publication No. 174807/1988).
In the chuck with co-operating four jaws of a type of differential and centripetal operations in two directions described above, however, as four jaws disposed in two directions co-operate in differencial and centripetal direction, the chuck is applicable for centering and holding an irregular object, but in order to hold the object in a pre-determined position, another problem that the conventional single-type chuck with four jaws must be used or a separate tool therefor must be used is inevitable.
The present invention comprises a chuck with four jaws of the first type developed from the power driven chuck with co-operating four jaws capable of operation in differential and centripetal in two directions described above, and a chuck with four jaws of the second type provided with additional functions over the manually driven chuck with co-operating four jaws capable of operation in differencial and centripetal in two directions described above.
The first object of the present is to present a chuck with four differential jaws of a first type capable of, besides ordinary operation of four point inward fixing and four point outward fixing, various holding operations such as two point inward fixing, two point outward fixing, and further, of one point positioning and two point positioning without exchanging the chuck itself. Moreover, the operation is carried out in a single operation same as the scroll chuck.
The second object of the present is to improve rigidity and capability against wering of a chuck with four differenti
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Schultz Robert
Schwartz Larry I.
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