Provided is a tool holding structure capable of effectively preventing a cutting tool from coming off a chuck portion. An outer fitting portion A is formed in an outer face of a shank portion 2 of a cutting tool T and an inner fitting portion B is formed in an inner face of a chuck portion 12 of a tool holder. A fitting member 20 is provided to be fitted to the outer fitting portion A and the inner fitting portion B respectively. The fitting member 20 includes a protruding portion 22 which protrudes from an outer circumference of the shank portion 2 when fitted to the outer fitting portion A. A guide groove 18 is formed for guiding the protruding portion 22 of the fitting member 20 from an open side of an inner space 13 to the inner fitting portion B. The inner fitting portion B includes a rotation preventing face for preventing relative rotation between a holder body 10 and the cutting tool T in association with contact thereof with the protruding portion 22 and a slip-out preventing face for preventing slip-out of the cutting tool T in association with contact thereof with the protruding portion 22.

A coupling device and coupling method for the self-securing mechanical connection of two parts of a holding system for medical instruments, including a bolt element insertable into a bushing; wherein the bushing has a main body and, connected fixedly to the latter, a cone sleeve which tapers conically at its free end, wherein a cage sleeve acted upon by a spring and guiding clamping bodies is inserted axially movably into the cone sleeve and can be moved between an uncoupled position, a release position and a locking position. The clamping bodies in the locking position can be latched into a coupling groove of the bolt element by means of the spring force. The inclined coupling groove flank, at the front in the insertion direction, of the bolt element encloses an angle with the longitudinal axis of the bolt element, and the cone inner face of the cone sleeve encloses an angle with the central sleeve axis. The coupling device is characterized in that, for self-securing connection, the angle is greater than the angle such that clamping bodies partially or completely latched into the coupling groove can be pressed into the locking position counter to the insertion direction by application of a tensile force to the bolt element.

An attachment retainer having a collar that, when at a collar locked position, has a first surface that is positioned above an open end of a passageway of a spindle to assist in retaining locking members in locking engagement with a driven tool. When in a collar release position, a second surface of the collar is positioned above the open end of the passageway to provide a space to receive a portion of the locking members so that the locking members can be disengaged from the driven tool. A plunger is displaceable to a position beneath another opening of the passageway to assist in retaining locking members in the passageway. A cam surface of a release ring can engage, and facilitate linear displacement of, release members as the release ring is rotated, which can facilitate axial displacement of the collar from the collar locked position to the collar release position.

A coupling device and coupling method for the self-securing mechanical connection of two parts of a holding system for medical instruments, including a bolt element insertable into a bushing; wherein the bushing has a main body and, connected fixedly to the latter, a cone sleeve which tapers conically at its free end, wherein a cage sleeve acted upon by a spring and guiding clamping bodies is inserted axially movably into the cone sleeve and can be moved between an uncoupled position, a release position and a locking position. The clamping bodies in the locking position can be latched into a coupling groove of the bolt element by means of the spring force. The inclined coupling groove flank, at the front in the insertion direction, of the bolt element encloses an angle with the longitudinal axis of the bolt element, and the cone inner face of the cone sleeve encloses an angle with the central sleeve axis. The coupling device is characterized in that, for self-securing connection, the angle is greater than the angle such that clamping bodies partially or completely latched into the coupling groove can be pressed into the locking position counter to the insertion direction by application of a tensile force to the bolt element.

A cutting tool holding mechanism for detachably holding a cutting tool includes: a collet chuck configured to clamp and unclamp the cutting tool; a piston disposed deeper on the proximal side of the spindle than the collet chuck and configured to urge the collet chuck by the pressure of a fluid supplied from the proximal side of the spindle in the direction from the proximal side toward the distal end side of the spindle so that the collet chuck unclamps the cutting tool; a spool valve provided in the piston and configured to open thanks to centrifugal force at the time when the spindle is turned, so as to supply the fluid fed from the spindle side to the cutting tool.

An attachment retainer having a collar that, when at a collar locked position, has a first surface that is positioned above an open end of a passageway of a spindle to assist in retaining locking members in locking engagement with a driven tool. When in a collar release position, a second surface of the collar is positioned above the open end of the passageway to provide a space to receive a portion of the locking members so that the locking members can be disengaged from the driven tool. A plunger is displaceable to a position beneath another opening of the passageway to assist in retaining locking members in the passageway. A cam surface of a release ring can engage, and facilitate linear displacement of, release members as the release ring is rotated, which can facilitate axial displacement of the collar from the collar locked position to the collar release position.

A retaining socket for receiving a thread die includes a plunge component that is moveable along the longitudinal axis of the retaining socket and at least one pin extending parallel to the longitudinal axis configured to engage the thread die.

A quick detachable and adjustable magnetic seat for sleeve includes a magnetic device and a detachable positioning device. The magnetic device includes a first end and a second end. The first end is magnetic. The detachable positioning device includes a connecting end slidably disposed on the second end of the magnetic device, such that the magnetic device axially slides against the detachable positioning device. The detachable positioning device further includes a resilient quick detach device disposed on one end of the detachable positioning device away from the connecting end, whereby the detachable positioning device is removably disposed in a sleeve. Therefore, when the sleeve is damaged or broken, the adjustable magnetic seat is efficiently removed from the sleeve and re-installed in a new sleeve replacement.

A cutting tool holding mechanism for detachably holding a cutting tool includes: a collet chuck configured to clamp and unclamp the cutting tool; a piston disposed deeper on the proximal side of the spindle than the collet chuck and configured to urge the collet chuck by the pressure of a fluid supplied from the proximal side of the spindle in the direction from the proximal side toward the distal end side of the spindle so that the collet chuck unclamps the cutting tool; a spool valve provided in the piston and configured to open thanks to centrifugal force at the time when the spindle is turned, so as to supply the fluid fed from the spindle side to the cutting tool.

A quick detachable and adjustable magnetic seat for sleeve includes a magnetic device and a detachable positioning device. The magnetic device includes a first end and a second end. The first end is magnetic. The detachable positioning device includes a connecting end slidably disposed on the second end of the magnetic device, such that the magnetic device axially slides against the detachable positioning device. The detachable positioning device further includes a resilient quick detach device disposed on one end of the detachable positioning device away from the connecting end, whereby the detachable positioning device is removably disposed in a sleeve. Therefore, when the sleeve is damaged or broken, the adjustable magnetic seat is efficiently removed from the sleeve and re-installed in a new sleeve replacement.