Systems and methods for propelling a sledge head relative to a sledge body mounted to a handle are described. In an aspect, the sledge head is propelled from a sledge body through action of one or more pistons that are driven through combustion or ignition of charges secured within the sledge body. The charges can be activated based on contact between the sledge head and a working surface to engage one or more charges against a firing pin resulting in combustion or ignition of the charges. The tool can include one or more springs to bias the sledge head toward a retracted position, where activation of the one or more charges overcomes the spring bias to propel the sledge head against the working surface upon contact.

A fastening tool including a bit holding unit configured to hold a driver bit so as to be rotatable and to be movable in an axis direction, a first drive unit having a first motor configured to rotate the driver bit held by the bit holding unit, and a second drive unit having a second motor configured to move the driver bit held by the bit holding unit along the axis direction.

A fastening tool includes: a cylindrical rotation guide member extending in one direction and rotatably supported; a holding member having an opening to which a driver bit is detachably inserted, and configured to move in an axis direction along the extension direction of the rotation guide member inside the rotation guide member and to rotate together with the rotation guide member; and a moving member configured to move the holding member in a front and rear direction along the rotation guide member.

A fastening tool includes: a bit holding unit having a holding member configured to hold a driver bit so as to be rotatable and to be movable in an axis direction; a first drive unit having a first motor configured to rotate the driver bit held on the holding member by the bit holding unit; a second drive unit having a second motor configured to move the driver bit along the axis direction; and a control unit configured to control an amount of movement of the driver bit along the axis direction by an amount of rotation of the second motor.

A fastening tool includes: a screw accommodating unit configured to accommodate therein a screw; and a screw feeding unit configured to feed the screw accommodated in the screw accommodating unit to an ejection passage through which a driver bit is to pass. The screw feeding unit includes: a screw feeding motor, an engaging part configured to engage with the screw, and a screw feeding transmission part configured to transmit a drive force of the screw feeding motor to the engaging part.

A fastening tool includes: a nose unit configured to eject a screw to a fastening target and provided on a front side of a tool body extending in one direction along a moving direction of a driver bit to be engaged with the screw. The nose unit includes: an ejection passage to which the screw is supplied and through which the driver bit passes, and a contact member configured to come into contact with the fastening target. The ejection passage and the contact member are integrally assembled and the nose unit is detachably attached to the tool body.

A fastening tool includes: a cylindrical rotation guide member extending in one direction and rotatably supported; a holding member having an opening in which a driver bit is detachably inserted, and configured to move in an axis direction along the extension direction of the rotation guide member inside the rotation guide member and to rotate together with the rotation guide member; and a moving member configured to move the holding member in a front and rear direction along the rotation guide member; a rotation member; and a transmission member connected to the moving member and having flexibility to be wound along an outer periphery of the rotation member. The rotation member is rotated by the motor, so that the moving member is moved with the transmission member in one direction in which a screw engaged with the driver bit is pressed against a fastening target.

An assembly method is provided during which a first component is arranged with a second component. The first component is secured to the second component using a fastener assembly. The fastener assembly includes a fastener element and a washer. The fastener element includes a wrenching feature. The washer has a full-hoop annular body with a cylindrical outer surface. The securing includes: mating a socket device with the fastener element and the washer, the socket device engaging the wrenching feature and the cylindrical outer surface; and rotating the fastener element about an axis using the socket device to tighten the fastener assembly and clamp the washer axially between the first component and the fastener element. The socket device centers the washer to the fastener element during the rotating.

A powder-driven connecting tool for connecting power lines is disclosed, as are assemblies and replacement parts for such a tool. The tool includes a tool head with an anvil, and a power unit with a ram. A breech cap assembly connects to the power unit and includes a sleeve threaded on both ends and a cap threadedly mounted on one end of the sleeve. The sleeve and cap define a breech for a powder charge. An adapter is mounted on an outer end surface of the cap. The adapter is narrower than the cap itself and is adapted to be driven by a power tool in order to tighten and loosen the cap and the sleeve. The adapter may, for example, have the form of a hex nut.

A fastening tool includes: a cylindrical rotation guide member extending in one direction and rotatably supported; a holding member having an opening to which a driver bit is detachably inserted, and configured to move in an axis direction along the extension direction of the rotation guide member inside the rotation guide member and to rotate together with the rotation guide member; and a moving member configured to move the holding member in a front and rear direction along the rotation guide member.