An electric power tool includes a drive device for providing a driving force, a rotation wheel that has a central axis and is driven by the drive device to rotate around the central axis, a spindle that supports a tool holder configured to hold a tool of the electric power tool, a first intermediate member, a second intermediate member, and a counterweight device. The first intermediate member is offset from the central axis of the rotation wheel, and revolves around the central axis when driven by the rotating rotation wheel, while driving the spindle to reciprocate in a first direction. The second intermediate member is driven by the first intermediate member to rotate around the central axis and is disposed to be offset from the central axis of the rotation wheel on the side opposite the first intermediate member. The counterweight device is driven by the second intermediate member.

A jig saw including a clamping mechanism for removably clamping a saw blade and a driving mechanism. The clamping mechanism includes an actuating member and a clamping mechanism, the actuating member is configured to rotate about a first axis, thereby driving the clamping mechanism to achieve locking or unlocking of the saw blade. The actuating member includes an inclined surface extending in a rotation direction of the actuating member. The inclined surface cooperates with the clamping mechanism thereby to drive the clamping mechanism when the actuating member rotates. Since the clamping mechanism of the jig saw uses a clamping mechanism to apply pressure to the saw blade from the side, thereby abutting and fixing it on the main body, such a clamping mechanism therefore can be applied to different types of saw blades, regardless of the shape of the end faces of their clamping ends (e.g., V-shaped or U-shaped).

A pneumatic reciprocating saw comprises a housing, a saw extending into the housing, a pneumatic motor assembled with the housing and a transmission assembly. The pneumatic motor comprises an output shaft, the transmission assembly comprises a driving bevel gear arranged on the output shaft, a transmission bevel gear engaged with the driving bevel gear, a driven rod being arranged on the transmission bevel gear, a pushing block being eccentrically arranged on the driven rod, a transmission rod assembled with the saw, and a thermal insulator sleeved on the transmission rod without being shifting along with the transmission rod. The transmission rod comprises a groove for placing the pushing block to slide therein, when the transmission rod is driven to reciprocate in a linear track, a tail end of the transmission rod not connected with the saw being limited by the thermal insulator to only move in the linear track.

A pneumatic reciprocating saw comprises a housing, a saw extending into the housing, a pneumatic motor assembled with the housing and a transmission assembly. The pneumatic motor comprises an output shaft, the transmission assembly comprises a driving bevel gear arranged on the output shaft, a transmission bevel gear engaged with the driving bevel gear, a driven rod being arranged on the transmission bevel gear, a pushing block being eccentrically arranged on the driven rod, a transmission rod assembled with the saw, and a thermal insulator sleeved on the transmission rod without being shifting along with the transmission rod. The transmission rod comprises a groove for placing the pushing block to slide therein, when the transmission rod is driven to reciprocate in a linear track, a tail end of the transmission rod not connected with the saw being limited by the thermal insulator to only move in the linear track.

A hole saw includes a base member configured to secure the hole saw to a drive device and a plurality of blade members where each blade member is connected to and disposed orthogonally to the base member via a respective extender. Each blade member has cutting teeth extending in a respective cutting direction and distances between the cutting teeth and the base member vary along the respective cutting direction of the respective blade members. Each respective extender is configured cantilever support opposite, freestanding distal ends of the respective blade member where each distal end of each respective blade member is disconnected from the distal end of an adjacent blade member.

A tool for removing a bushing from a workpiece includes a tool body, a first reference, and a second reference for positioning the tool body on a workpiece. A saw slot is defined through the tool body to provide access to the workpiece for a saw blade. A saw guide is proximate the saw slot, the saw guide arranged to position a saw blade in a cutting plane spaced apart from the workpiece for removing a segment of a bushing fixed to the workpiece relative to the first and second references.

A saw system capable of cutting through a workpiece in one stroke is provided. The saw system includes a base, a turntable mounted on the base for rotation about a vertical axis, a support structure defining a cutting axis and fixedly attached to the turntable, and an elongated blade including a cutting edge. The turntable has a substantially planar support surface for supporting a workpiece. The support structure includes a pair of parallel sliding members having proximal and distal ends. The saw system further includes a handle assembly coupled with a bearing member, which is mechanically engaged with the sliding members, and an elongated blade fixedly attached to the bearing member. The elongated blade includes a serrated cutting edge that is acutely angled relative to the support surface.

A saw system capable of cutting through a workpiece in one stroke is provided. The saw system includes a base, a turntable mounted on the base for rotation about a vertical axis, a support structure defining a cutting axis and fixedly attached to the turntable, and an elongated blade including a cutting edge. The turntable has a substantially planar support surface for supporting a workpiece. The support structure includes a pair of parallel sliding members, wherein the sliding members are disposed in a direction substantially parallel to the cutting axis. The elongated blade is spaced apart from the sliding members and is movable along the sliding members. The cutting edge includes a proximal end and a distal end, wherein an angle between an imaginary line connecting the distal end of the cutting edge to the proximal end thereof and its projection onto the turntable is an acute angle.

Apparatus for converting rotary motion to linear motion and/or linear motion to rotary motion, comprising: a rotatable piece (24) having a surface, the piece being rotatable about an axis thereof; at least one member (26a-d) having a linking surface (44a-d) facing the surface of the rotatable piece and arranged for restricted movement at least in part laterally relative to the axis of the piece; and located between the surface of the rotatable piece and the or each reciprocating member, means for linking the linking surface of the respective member and the surface of the rotatable piece, wherein the means for linking (30a-d), the surface of the rotatable piece and the linking surface are configured to cooperate so that rotational motion of the rotatable piece causes linear movement of the at least one member, and/or linear movement of the at least one member causes rotational motion of the rotatable piece. A sawing device may include said apparatus, the sawing device being for cutting by repetitive reciprocating cutting action of at least one blade on a surface of an object to be cut. A saw blade (10a-d) may be configured for such a sawing device.

A hole saw includes a base member configured to secure the hole saw to a drive device and a blade member extending orthogonally from each side of the base member. Each blade member is configured having respective distal ends that flex transversely to a longitudinal cutting direction of the blade member. Responsive to rotational movement of the hole saw via the drive device against a structure, a medial location of each blade member creates an initial respective linear cutting path into the structure, and further movement of the respective blade members into the structure cause the distal ends of the respective blade members to flex transversely to the cutting direction and follow the initial linear cutting path despite the rotational movement of the hole saw relative to the structure to produce a linear cut through the structure.