4-Jaw work holding lathe chuck
OwnerBernard Smithinventor
Life of this patent
Estimating the term…
Abstract
Locking mechanism for the adjusting mechanism of a 4-jaw work holding rotary chuck of the kind having oppositely disposed pairs of jaws normally adjusted in position with equal and opposite movement but having provision for differential adjustment of one of each pair of oppositely disposed jaws relative to the other, the locking mechanism being constituted by a spring loaded driving member drivably connected to the adjusting mechanism and by a fixed element which the spring loaded driving member is capable of engaging non-rotatably, a turning moment applied to said spring loaded driving member in either direction being effective first to displace the latter from engagement with said fixed element and then to rotate the adjusting mechanism.
Claims8
A 4-jaw work holding rotary chuck comprising a body part with oppositely disposed radiating guides;
- respective jaws slidably adjustable along said guides;
- a pair of adjusting screws extending diametrically across the body part and each extending through a pair of opposed jaws, each adjusting screw having a right-hand thread at one end and a left-hand thread at the other end for adjusting the respective pair of jaws with equal and opposite movement, the adjusting screws being disposed in mutually offset planes and crossing each other at the axis of the chuck so that each adjusting screw can be operated independently of the other for adjusting the associated pair of jaws relative to the other pair;
- means for effecting a relative adjustment of one of each pair of jaws relative to the other jaw of such pair, said means being operable independently of said adjusting screws and comprising a pair of sleeves associated with respective ones of the adjusting screws, each sleeve being mounted on one end of its associated adjusting screw and being internally screwthreaded for engaging the screwthread at that end of the screw and externally screwthreaded, with a screwthread of opposite hand, for engaging the jaw which is mounted on that end of the screw;
- a pair of lockable driving means for rotatably driving respective ones of said sleeves, each driving means comprising a rotary driving member arranged for non-rotatably engaging said body part of the chuck and being movable relative to its associated sleeve out of non-rotary engagement with said body part;
- spring means for yieldably urging said driving member into non-rotary engagement with said body part;
- and a pair of rotatable torque applying means being provided for rotating said driving members, each torque applying means comprising a driving surface arranged in lost motion rotary driving connection with a driven surface of the associated spring loaded driving member, and cam means on said associated torque applying means for engaging and displacing said driving member along the axis of the associated sleeve and out of non-rotary engagement with said body part during lost motion rotation of said driving surface relative to said driven surface so that said driving member becomes rotatable by said driving surface.
Dependencies are inferred from the claim text.