Abstract: A power tool having a body, a tool bit holder protruding from the tool body for holding and rotating a tool bit about an axis of rotation, and an operator for operating the bit holder. The operator includes an annular member rotationally engageable with the bit holder for manual turning to tighten and/or release the bit holder, and a mount mounting the annular member to the tool body for movement between a non-operative position, rotationally disengaged from the bit holder, and an operative position, rotationally engaged with the bit holder.

Abstract: A battery pack for a power tool includes a casing housing rechargeable cells. A receiving bay in the casing receives slide-in parts of the power tool and of a recharging stand, to retain the battery pack. A pair of primary electrical contacts is located in or adjacent the receiving bay. A recess opens into the receiving bay. A supplementary electrical contact is located within the recess, and a user-manipulable catch is also located in the recess alongside the supplementary contact. That is, a single recess houses both the supplementary contact and the mechanical catch. The supplementary contact is usable when recharging the battery to relay battery temperature information to a recharging stand, but has no function when the battery pack is attached to the power tool. The catch, useful in retaining the battery pack on the power tool, has no function with the recharging stand.

Abstract: An electric cutting tool has a body, a chuck at an end of the body for attaching a cutting implement having a rear end including a recess, and a drive mechanism for driving the chuck to slide in reciprocation for operating the cutting implement. The chuck has a gap for receiving the rear end of the implement, an internal multi-part fixing mechanism for engaging the recess of the cutting implement in the gap, and an outer cylinder having an inner cam surface for acting upon the fixing mechanism. The cylinder is manually rotatable between a locked position in which the cam surface presses the fixing mechanism tight against the recess in the gap to fix the cutting implement in place and an unlocked position in which the fixing means is released from the cutting mechanism. The fixing mechanism includes two discrete balls.

Abstract: A power hand tool includes a body and an electric motor in the body and having a shaft for driving a connector for connecting and driving a cleaning/polishing implement. An enclosure encloses the motor for protection against intrusion of a liquid, and includes a thermally conductive end cap that is exposed outside of the body. A thermal conductor in contact with a metal casing of the motor and the end cap conducts heat from the motor to the end cap for heat dissipation.

Abstract: A holder for holding a tool implement for use with a power tool having a drive output member. The holder includes a pair of first and second supports for connection to the output member, a clamp member located between the supports, and a cam supported between the first support and the clamp member. The cam can be turned between an operative position, urging the clamp member towards the second support to hold the tool implement, and an inoperative position, releasing the clamp member for removal of the tool implement.

Abstract: A holder for holding a tool implement for use with a power tool having a drive output member. The holder includes a pair of first and second supports for connection to the output member, a clamp member located between the supports, and a cam supported between the first support and the clamp member. The cam can be turned between an operative position, urging the clamp member towards the second support to hold the tool implement, and an inoperative position, releasing the clamp member for removal of the tool implement.

Abstract: A lighting device (50) comprises a light source (40) e.g. LED, a convex reflector (43) for receiving light from the LED (40), and a concave reflector (41) for receiving light from the convex reflector (43). A relatively narrow angled light beam from the LED (40) is diverged by the convex reflector (43) and then converged by the concave reflector (41) into a relatively broader parallel light beam. The two reflectors (43 & 41) may be replaced by plano-concave and convex lens (143 & 141) respectively.

Abstract: A power tool having a body, a tool bit holder protruding from the tool body for holding and rotating a tool bit about an axis of rotation, and an operator for operating the bit holder. The operator includes an annular member rotationally engageable with the bit holder for manual turning to tighten and/or release the bit holder, and a mount mounting the annular member to the tool body for movement between a non-operative position, rotationally disengaged from the bit holder, and an operative position, rotationally engaged with the bit holder.