Patent ID: 6464235
Filing Date: 2002-10-15
Classification: B23B,Y10T

Abstract:
A lathe chuck comprising:a chuck body centered on and rotatable about a main axis and formed with a plurality of radially extending jaw-guide grooves and, transverse to the grooves, with respective guide passages each in turn formed with an abutment; respective jaws radially displaceable in the grooves and each having at least one tooth exposed in the respective guide passage; respective control rods displaceable along the passages and each having at least one tooth meshing with the tooth of the respective jaw, the teeth being angled relative to the respective passages such that movement of the rods along the respective passages displaces the respective jaws radially in their guide grooves; a control pin axially displaceable in each rod between an extended position projecting into the respective jaw-guide groove and a retracted position, the control pins being displaced on engagement with the teeth of the respective jaws into the retracted positions; a latch pin axially displaceable in each rod between an extended latching position engaging the respective abutment and preventing movement of the respective rod in the respective passage and a retracted position permitting such movement; means including a spring for urging the pins into their extended positions; and means including a coupling member engaged between the pins for displacing the latch pin into the respective retracted position on displacement of the control pin into its retracted position, whereby when there is no jaw in the guide groove, the latch pin of the respective control rod locks same against movement in the respective passage.