| 摘要 |
A drill chuck assembly. The drill chuck assembly includes a rapid change mechanism configured to retain a drill bit shank inserted therein. The drill chuck assembly includes a body having a bore with a trilobe cross-section that is configured to receive a triangular and hexagonally shaped drill bit shank, interchangeably. The bore includes a slot positioned in each lobe that slidably contains a detent ball therein. A collar is affixed annularly around the body and defines a channel extending around the body. A sleeve is slidably mounted around the body. The sleeve includes a tapered end that is slidably disposed within the channel and has circular apertures that are in communication with the slots of the bore for reception of the detent balls. The sleeve is spring biased towards the collar, which forces the detent balls against an angular wall within the channel. The angular wall in turn forces the detent balls laterally towards a center of the bore, thereby exerting a force on a drill bit shank inserted into the bore and preventing the withdrawal of the shank from the bore. When the bias force of the sleeve is counteracted by sliding the sleeve about its longitudinal axis, the detent balls move outwardly along the angular wall, thereby relieving the force exerted onto the shank by the Wall and allowing the shank to be withdrawn. |
| 主权项 |
1) A drill chuck assembly comprising:
a body including an upper end, a lower end configured to threadably engage a rotational drive, and a bore extending longitudinally therethrough; the bore including a trilobe configuration configured to interchangeably receive a triangular drill bit shank and a hexagonal drill bit shank; a plurality of slots extending longitudinally along the body, one of the plurality of slots disposed at each lobe of the body; wherein the plurality of slots are in communication with the bore; a collar disposed about the body at the upper end thereof, the collar including an angled wall; wherein the angled wall and the body defined a channel therebetween, the channel including a depth that increases from the upper end towards the lower end; a sleeve slidably positioned along the body, the sleeve longitudinally slidable between a first position and a second position; the sleeve biased to the first position by a spring; the sleeve including a plurality of apertures, wherein each of the plurality of apertures are aligned and in communication with one of the plurality of slots between the first position and the second position; a plurality of detent balls, one of the plurality of detent balls positioned in one of the plurality of apertures and extending into one of the plurality of slots aligned therewith; wherein the plurality of detent balls are slidable along the plurality of slots; the plurality of detent balls including a diameter larger than a width of the plurality of slots; wherein the plurality of detent balls are configured to laterally depress and transition longitudinally along the angled wall when a drill bit shank is inserted into the bore, thereby sliding the sleeve towards the lower end to a locked position in which the depth of the channel is equal to the diameter of the plurality of detent balls; the locked position securing the drill bit shank within the bore via a bias force exerted by the spring; and wherein moving the sleeve to the second position moves the plurality of detent balls to a position in the channel wherein the depth is larger than the diameter of the plurality of detent balls, releasing the drill bit shank. |
