A screw driver (100) which comprises a motor (110) and a rotation transmission mechanism (120) is provided. The rotation transmission mechanism (120) comprises a driving gear (125), a spindle (150), a roller (141) and a retainer (130). The retainer (130) moves the roller (140) in a circumference direction of the spindle (150) and thereby a position of the roller (140) between a transmittable position and a non-transmittable position is switched.

A screw driver (100) which comprises a motor (110) and a rotation transmission mechanism (120) is provided. The rotation transmission mechanism (120) comprises a driving gear (125), a spindle (150), a roller (141) and a retainer (130). The retainer (130) moves the roller (140) in a circumference direction of the spindle (150) and thereby a position of the roller (140) between a transmittable position and a non-transmittable position is switched.

A manual screwdriver includes a handle defining a cavity and a slot, a screwdriver head at one end of the handle, a rotation connector rotatably received in the cavity, a spiral rod defining a spiral groove and being rotatably received in the cavity, an operating arm slidably received in the spiral groove with two ends of the operating arm extending from the cavity through the slot, and a first elastic element biased on the operating arm. The screwdriver head is connected to the handle via the rotation connector. The spiral rod can be driven by the operating arm to engage or disengage the rotation connector. When the spiral rod and the rotation connector are combined into an engaged state, the operating arm can slide in the spiral groove toward the screwdriver head to drive the spiral rod and the rotation connector to rotate relative to the handle.

A manual screwdriver includes a handle defining a cavity and a slot, a screwdriver head at one end of the handle, a rotation connector rotatably received in the cavity, a spiral rod defining a spiral groove and being rotatably received in the cavity, an operating arm slidably received in the spiral groove with two ends of the operating arm extending from the cavity through the slot, and a first elastic element biased on the operating arm. The screwdriver head is connected to the handle via the rotation connector. The spiral rod can be driven by the operating arm to engage or disengage the rotation connector. When the spiral rod and the rotation connector are combined into an engaged state, the operating arm can slide in the spiral groove toward the screwdriver head to drive the spiral rod and the rotation connector to rotate relative to the handle.

A hand tool for driving a fastener is provided. The hand tool includes gearing that interconnects a splined socket to a rotatable or trigger actuator and increases a rotational speed of the splined socket relative to the actuator. The hand tool may include a power tool receiver 38 or an independent motor to drive rotation of the splined socket to advance or retract a fastener from a threaded shaft. By increasing the speed and conserving rotational inertia, the hand tool reduces the time to secure a fastener on a threaded shaft. A rotatable nut is provided. The rotatable nut can slideably orient along a first axis and threadedly orient along a second axis to fasten to an adjacent surface.

Mounting device for inserting insulation holders into insulation material, where the mounting device comprises a drive head adapted to drive the insulation holder through a central opening of the head portion of the mounting device, where the central opening is provided with a threaded portion, where the lead pitch of the threaded portion is at least 30 millimetres. The advantage of the invention is that insulation holders can be inserted into insulation material in an easy and cost-effective way. An insulation holder can be driven completely through the central opening since the insulation holder does not have a protruding head. The insulation holder is provided with a thread corresponding to the thread of the central opening, such that the insulation holder is screwed into the insulation material.

Mounting device for inserting insulation holders into insulation material, where the mounting device comprises a drive head adapted to drive the insulation holder through a central opening of the head portion of the mounting device, where the central opening is provided with a threaded portion, where the lead pitch of the threaded portion is at least 30 millimetres. The advantage of the invention is that insulation holders can be inserted into insulation material in an easy and cost-effective way. An insulation holder can be driven completely through the central opening since the insulation holder does not have a protruding head. The insulation holder is provided with a thread corresponding to the thread of the central opening, such that the insulation holder is screwed into the insulation material.

This disclosure describes the invention of a winged screwdriver. Limitations of the utility of screwdrivers described prior art are discussed, including physical clearance requirements. These limitations are eliminated by the use of a winged screwdriver, which allows its user to provide sufficient torque for tightening and loosening screws with vertical clearance of as little as 2 inches. This screwdriver is assembled from two component pieces: a wingnut, and a machined piece, known as the screw-bit.

This disclosure describes the invention of a winged screwdriver. Limitations of the utility of screwdrivers described prior art are discussed, including physical clearance requirements. These limitations are eliminated by the use of a winged screwdriver, which allows its user to provide sufficient torque for tightening and loosening screws with vertical clearance of as little as 2 inches. This screwdriver is assembled from two component pieces: a wingnut, and a machined piece, known as the screw-bit.

Mounting device for inserting insulation holders into insulation material, where the mounting device comprises a drive head adapted to drive the insulation holder through a central opening of the head portion of the mounting device, where the central opening is provided with a threaded portion, where the lead pitch of the threaded portion is at least 30 millimetres. The advantage of the invention is that insulation holders can be inserted into insulation material in an easy and cost-effective way. An insulation holder can be driven completely through the central opening since the insulation holder does not have a protruding head. The insulation holder is provided with a thread corresponding to the thread of the central opening, such that the insulation holder is screwed into the insulation material.