Patent ID: 11364546

Abstract:
Provided is a chuck apparatus enabling ease of rotation of a rotating cylinder in the loosening direction when replacing a tool, suppressed wear of the ratchet teeth, and a longer life span. Through the rotation of a rotating cylinder (1), the chuck apparatus expands or contracts a plurality of jaws (3) inserted into a hole (2a) provided to a tip end of a body (2), and sandwiches and holds a tool (4) using the jaws (3). An annular rotating body (8) screwed together with the jaws (3) and rotating together with the rotating cylinder (1) is fitted to the body (2) inside the rotating cylinder (1). Annular ratchet teeth (5) are provided to the body (2) or the rotating body (8), a detachable locking spring body (9) for locking with the ratchet teeth (5) is provided, and a lock release mechanism is provided for forcibly releasing the locking between the ratchet teeth (5) and the locking spring body (9) when a rotational force in a tightening direction is brought to zero after the rotating cylinder (1) has been rotated in the tightening direction and a holding force on the tool (4) has reached a predetermined value.