A power tool includes a motor housing having a motor configured to rotate an output shaft about a drive axis and a gear housing defining a gear compartment. A pinion gear is supported by the gear housing that is coupled to the output shaft for rotation about the drive axis. A bevel gear is supported by the gear housing for rotation about a bevel axis and includes a geared portion that is meshingly engaged with the pinion gear. A crank pin extends from the same side of the bevel gear as the geared portion at a position offset from the bevel axis. An articulating housing is pivotably supported by the gear housing for pivotal movement about the bevel axis. A plunger member is supported by the articulating housing for reciprocating movement along a reciprocating axis. The plunger member includes a yoke end portion coupled to the crank pin.

The present invention provides a linear saw, and a machining method and a numerical control machining device that use the linear saw. The linear saw includes a machining part, used for cutting a workpiece in a linear extension direction of the linear saw and forming a machined slot in the workpiece. The linear saw further includes a space-keeping part, which is disposed so that the entire linear saw does not contact the machined slot or is not subjected to an acting force from the machined slot when the space-keeping part passes through the machined slot. Because the linear saw has a space-keeping structure, the linear saw has time and space to recover from deformation produced after cutting a workpiece, thereby efficiently preventing an accumulated error and greatly improving position precision of a machined gap.

The present invention provides a linear saw, and a machining method and a numerical control machining device that use the linear saw. The linear saw includes a machining part, used for cutting a workpiece in a linear extension direction of the linear saw and forming a machined slot in the workpiece. The linear saw further includes a space-keeping part, which is disposed so that the entire linear saw does not contact the machined slot or is not subjected to an acting force from the machined slot when the space-keeping part passes through the machined slot. Because the linear saw has a space-keeping structure, the linear saw has time and space to recover from deformation produced after cutting a workpiece, thereby efficiently preventing an accumulated error and greatly improving position precision of a machined gap.

A reciprocating saw blade that includes an elongated blade body defining an inner end and a distal end, a cutting edge located on one side of the blade body and extending between the inner and distal ends thereof and a tang located at the inner end of the blade body. The tang projects from the blade body at an acute angle of at least about 3° relative to a line tangent to an inner end of the cutting edge. The cutting edge includes a portion defining a substantially curved contour and optionally can include at least one further portion defining a non-curved contour.

There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.

There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.

There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.

There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.

A reciprocating saw includes a frame, a motor, a belt pulley, a reciprocating block, a guide pillar, a driving belt, two guide blocks, two sliding blocks, two clamps, a saw blade, a base, a mounting rack, a driving wheel, a connecting rod, a fixed rod, and a plurality of pulleys. The frame includes a first side, a second side opposite to the first side, and a third side connecting the first side and the second side. The mounting rack is disposed between the first side and the second side. The motor and the belt pulley are disposed on the mounting rack. The motor includes a motor shaft and the driving wheel is disposed on the motor shaft. The belt pulley is connected to the driving wheel through a belt. The connecting rod includes a first end hinged to the belt pulley and a second end hinged to the reciprocating block.

A linear saw, machining method using the same and numerical controlled machining device. The linear saw has: a machining part (1), for cutting a machining object in a linearly extending direction of the linear saw, and generating a slot on the machining object; and the linear saw further includes a space-keeping part (2) arranged such that the whole linear saw does not contact the slot or is not subject to an acting force of the slot when the space-keeping part passes through the slot. As the linear saw is provided with a space-keeping structure, the linear saw has time and space to recover from a deformation generated by cutting the machining object, thus effectively preventing accumulated errors, and greatly improving the position precision of the machining seam.