| 摘要 |
A self-locking drill chuck, comprising a chuck body (1), clamping jaws (4), a nut (3), a nut jacket (5), a front sleeve (6), and a rear sleeve (2), a rotational sleeve (8) is provided between the front sleeve (6) and the nut jacket (5), the rotational sleeve (8) is mounted onto the nut jacket (5) with a turning space provided in the nut jacket (5), on the rotational sleeve (8) there are two protruding stoppers (8-1), the nut jacket (5) has pawls (5-1), a gear wheel (11) is fixed to the outer circumference of the rear part of the chuck body (1), the gear wheel (11) has teeth (11-1). When tightening or loosening of the drill chuck, through the rotational sleeve (8), the front sleeve (6) carries the nut jacket (5) to turn accordingly, so that the stopper (8-1) of the rotational sleeve (8) will guide the pawls (5-1) of the nut jacket (5) to move inwards or outwards. The pawls (5-1) correspond with the teeth (11-1) of the gear wheel (11). When the pawls (5-1) are pushed inwards, it will fit into the teeth (11) thus will be self-locked. The drill chuck according to the present invention has the function of self-locking, the drill tools fastened by the drill chuck may not be loosed due to the vibration and the impact, the present invention has the advantages of a simple structure, high working stability, convenience of operation, and high reliability of self-locking capability. It can be used for the clamping of various drill tools. <IMAGE>
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