| 摘要 |
A tool-bit holder for receiving a tool-bit that automatically captures the tool-bit as it is inserted into the holder with a quick release mechanism to prevent axial withdrawal of the tool-bit from the holder. The tool-bit includes a shank portion with a circumferential groove. The tool-bit holder also includes a hub having a longitudinal bore for receiving the shank and a radial bore partially housing a detent ball used to capture the tool-bit shank at its circumferential groove within the tool-bit holder. A sleeve is axially slidably mounted relative to the hub and has a radial bore in communication with the radial bore of the hub for reception of the detent ball. The sleeve is axially biased by a spring and forces the detent ball against and along an inner ramp face fixed relative to the hub. The inner ramp face forces the detent ball radially inwardly and through the radial bore to seat in the circumferential groove of the tool-bit shank. Attempted axial extraction of the tool-bit from the longitudinal bore without releasing the detent ball locks the ball against the inner ramp face and prevents extraction of the tool-bit. The tool-bit is released when the bias force of the spring is relieved or countered by axially sliding the sleeve relative to the hub, so that the tool-bit can then be withdrawn from the hub.
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