Patent ID: 10092960

Abstract:
[Problem]A chuck device capable of reliable locking with a simple structure is provided.[Solution]A chuck device (1) including a plurality of balls (41); a retainer (42) which holds the balls (41) so as to be rolled; a spring ring (34) configured to rotate together with a nut ring (33) and to switch between a rotation restricted state in which the retainer (42) is restricted in a loosening direction (L) and a restriction released state in which the restriction of the retainer (42) in the loosening direction (L) is released; and a one-way spring (31) which restricts the retainer (42) in the loosening direction (L) relative to a chuck body (11), in which the plurality of balls (41), the retainer (42) and the one-way spring (31) configure a one-way bearing mechanism (50) restricted in the loosening direction (L) provided between the nut ring (33) and the chuck body (11), and the retainer (42) in the rotation restricted state configures a bearing and lock mechanism (30).