The present invention is directed to a driving tool (1) for driving a rod (R) in rotation, comprising two stators (10, 20), two rotors (11, 21), two connexion means (12, 22) and a driving element (3) connected to the two connection means (12, 22), wherein the driving element (3) is elastically deformable, and wherein the relative angular position of the two rotors can be modulated. The present invention also covers a machine (M) comprising such a driving tool (1) as well as a method of machining a rod (R) using the same.

A tap holder having a simple structure and high runout accuracy is provided. A tap holder includes: a body having a collet holder hole having an opening toward distal end; a tap collet received in the collet holder hole, the tap collet having a tap mounting hole located at a distal end portion, and a sleeve hole located at a basal end portion; a torque transmission mechanism that transmits rotation of the body to the tap collet; a first elastic body disposed between the body and the tap collet to urge the tap collet toward distal end; a sleeve disposed to the body by received in the sleeve hole to prevent the tap collet from slipping off toward distal end; and a second elastic body disposed between the sleeve and the tap collet to urge the tap collet toward basal end.

A chuck structure includes: a first chuck, provided with a seat slidable relatively thereto, the seat provided with a first stop; a limiting element, swingable relatively to the seat, and provided with a second chuck; and an operating element, respectively connected with the limiting element and a second chuck, and driving the second chuck to move relatively to the first chuck to form an accommodation space between the first chuck and second chuck, an elastic element configured between the operating element and limiting element, and the elastic element pressing against the limiting element to approach the seat, allowing the second and first stops to be in contact with each other. The present invention can use the operating element 3 to adjust the size of the accommodation space, and the second stop in contact with first stop to make the operating element can only be rotated in a single direction.

Provided is a chuck structure, which is configured to chuck an annular workpiece from a radially outer side of the workpiece. The chuck structure includes: leaf spring members arranged at a predetermined pitch along a circumferential direction of the chuck structure so as to be symmetrical with respect to a mechanism center axis; chuck claw members mounted to distal ends of the leaf spring members, respectively; and a pressing force applying mechanism configured to apply a force of pressing the leaf spring members radially inward, to thereby elastically press the chuck claw members onto a radially outer surface of the workpiece.

A chuck structure includes: a first chuck, provided with a seat slidable relatively thereto, the seat provided with a first stop; a limiting element, swingable relatively to the seat, and provided with a second chuck; and an operating element, respectively connected with the limiting element and a second chuck, and driving the second chuck to move relatively to the first chuck to form an accommodation space between the first chuck and second chuck, an elastic element configured between the operating element and limiting element, and the elastic element pressing against the limiting element to approach the seat, allowing the second and first stops to be in contact with each other. The present invention can use the operating element 3 to adjust the size of the accommodation space, and the second stop in contact with first stop to make the operating element can only be rotated in a single direction.

An adapter tool with a drill bit is provided that selectively connects to a driver to provide added versatility to the driver. The adapter tool includes a spring with an engagement end that extends through a body to selectively engage a recess in the driver. A user can actuate the spring to quickly engage and disengage the adapter from the driver. In practice, a user can use the adapter-driver combination to drill a pilot hole using the drill bit on the adapter, selectively remove the adapter from the driver, and then put a screw into the pilot hole using the driver.

An adapter tool with a drill bit is provided that selectively connects to a driver to provide added versatility to the driver. The adapter tool includes a spring with an engagement end that extends through a body to selectively engage a recess in the driver. A user can actuate the spring to quickly engage and disengage the adapter from the driver. In practice, a user can use the adapter-driver combination to drill a pilot hole using the drill bit on the adapter, selectively remove the adapter from the driver, and then put a screw into the pilot hole using the driver.

A clamping device for clamping a workpiece or a tool or, more specifically, a tool holding fixture in a machine part of a machine tool includes a tension rod slidably mounted within the machine part; a clamping set movable by the tension rod between clamped and released positions; a tension spring dedicated to the tension rod so as to generate the pull-in force of the clamping set; and a release mechanism, by which the clamping set can be moved against the force of the tension spring into the released position by the tension rod. To make possible effective clamping at optimum force, the tension spring is clamped between first and second rod parts of the tension rod. The second rod part can move relative to the first rod part, and, as the clamping set moves into the released position, is compressed on both ends by the release mechanism by moving the two rod parts in opposite directions.

A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.

Provided is a chuck structure, which is configured to chuck an annular workpiece from a radially outer side of the workpiece. The chuck structure includes: leaf spring members arranged at a predetermined pitch along a circumferential direction of the chuck structure so as to be symmetrical with respect to a mechanism center axis; chuck claw members mounted to distal ends of the leaf spring members, respectively; and a pressing force applying mechanism configured to apply a force of pressing the leaf spring members radially inward, to thereby elastically press the chuck claw members onto a radially outer surface of the workpiece.