An electric chain saw assembly comprises a saw chain and a guide plate, the saw chain is arranged around an edge of the guide plate, and the saw chain comprises transmission chain pieces and connecting pieces which are sequentially and rotatably connected end to end; a top end of the transmission chain piece is are provided with a tooth cutting structure; and the tooth cutting structure comprises a cutting edge and a limiting tooth, the limiting tooth is located at a front end of the saw chain in a forward direction, the cutting edge is located at a rear end of the saw chain in the forward direction, and a chipping groove is arranged between the cutting edge and the limiting tooth. The electric chain saw assembly, has simple structure, is convenient to assemble and solves the problem that blades are bent or deviated due to resonance can be effectively.

An electric chain saw assembly comprises a saw chain and a guide plate, the saw chain is arranged around an edge of the guide plate, and the saw chain comprises transmission chain pieces and connecting pieces which are sequentially and rotatably connected end to end; a top end of the transmission chain piece is are provided with a tooth cutting structure; and the tooth cutting structure comprises a cutting edge and a limiting tooth, the limiting tooth is located at a front end of the saw chain in a forward direction, the cutting edge is located at a rear end of the saw chain in the forward direction, and a chipping groove is arranged between the cutting edge and the limiting tooth. The electric chain saw assembly, has simple structure, is convenient to assemble and solves the problem that blades are bent or deviated due to resonance can be effectively.

A chainsaw configured to be powered by a battery pack. The chainsaw includes a housing, a guide bar, and a power and drive assembly. The housing includes a battery interface for receiving the battery pack. The guide bar guides a cutting chain and is removably coupled to the housing. The power and drive assembly includes a motor and a gear train. The motor is disposed within the housing and is configured to be powered by the battery pack. The gear train is driven by the motor and configured to drive the cutting chain. The housing, the guide bar, and the power and drive assembly each contribute to a total weight of the chainsaw. A power output by the power and drive assembly compared to the total weight defines a power-to-weight ratio of above 150 Watts per Pound.

A chainsaw configured to be powered by a battery pack. The chainsaw includes a housing, a guide bar, and a power and drive assembly. The housing includes a battery interface for receiving the battery pack. The guide bar guides a cutting chain and is removably coupled to the housing. The power and drive assembly includes a motor and a gear train. The motor is disposed within the housing and is configured to be powered by the battery pack. The gear train is driven by the motor and configured to drive the cutting chain. The housing, the guide bar, and the power and drive assembly each contribute to a total weight of the chainsaw. A power output by the power and drive assembly compared to the total weight defines a power-to-weight ratio of above 150 Watts per Pound.

Systems and methods which provide control of lubricant delivery with respect to chainsaws using a lubricant flow shutoff valve controlled in correspondence to an operational state of the chainsaw are described. A chainsaw lubricant delivery control system may include a lubricant flow shutoff valve and a chainsaw operation-based valve controller operable cooperatively to provide control of lubricant delivery to the cutting chain and guide bar assembly of a chainsaw. The chainsaw operation-based valve controller may be coupled to an operationally active element of the chainsaw wherein the chainsaw operation-based valve controller may control the lubricant flow shutoff valve between an open position and a closed position responsive to detecting a particular state of the operationally active element corresponding to an operational state of the chainsaw. Chainsaw lubricant delivery may prevent or otherwise discourage unintended leakage of lubricant from the chainsaw lubrication system.

Systems and methods which provide control of lubricant delivery with respect to chainsaws using a lubricant flow shutoff valve controlled in correspondence to an operational state of the chainsaw are described. A chainsaw lubricant delivery control system may include a lubricant flow shutoff valve and a chainsaw operation-based valve controller operable cooperatively to provide control of lubricant delivery to the cutting chain and guide bar assembly of a chainsaw. The chainsaw operation-based valve controller may be coupled to an operationally active element of the chainsaw wherein the chainsaw operation-based valve controller may control the lubricant flow shutoff valve between an open position and a closed position responsive to detecting a particular state of the operationally active element corresponding to an operational state of the chainsaw. Chainsaw lubricant delivery may prevent or otherwise discourage unintended leakage of lubricant from the chainsaw lubrication system.

A handheld cutting tool includes a motor, a driven gear coupled to the motor for receiving torque therefrom and a sprocket coupled for co-rotation with the driven gear, a handle guard extending from handle portion, a chain supported on a guide bar and engaged with the sprocket such that rotation of the sprocket moves the chain along the guide bar, and a battery pack removably coupled to an end of the handle portion. The handle guard includes a support face configured to support the handheld cutting tool on a horizontal support surface, and the battery pack includes a foot portion. A center of gravity of the handheld cutting tool is located above the foot portion and permits balancing of the handheld cutting tool in an upright position on only the foot portion.

A handheld cutting tool includes a motor, a driven gear coupled to the motor for receiving torque therefrom and a sprocket coupled for co-rotation with the driven gear, a handle guard extending from handle portion, a chain supported on a guide bar and engaged with the sprocket such that rotation of the sprocket moves the chain along the guide bar, and a battery pack removably coupled to an end of the handle portion. The handle guard includes a support face configured to support the handheld cutting tool on a horizontal support surface, and the battery pack includes a foot portion. A center of gravity of the handheld cutting tool is located above the foot portion and permits balancing of the handheld cutting tool in an upright position on only the foot portion.

A chain saw has a fluid pump. The fluid pump has a pump rod, a pump core assembly defining a pumping channel, and a pump body. The pump core assembly has an inner pump core and an outer pump core. The pumping channel is formed at least by a first hole defined in the inner pump core and a second hole defined in the outer pump core and the first hole is in communication with the inlet and the outlet. The pump rod is arranged to do a straight reciprocating motion in the pumping channel along a first axis so as to force fluid to flow from the inlet to the outlet by passing through the first hole.

A chain saw has a fluid pump. The fluid pump has a pump rod, a pump core assembly defining a pumping channel, and a pump body. The pump core assembly has an inner pump core and an outer pump core. The pumping channel is formed at least by a first hole defined in the inner pump core and a second hole defined in the outer pump core and the first hole is in communication with the inlet and the outlet. The pump rod is arranged to do a straight reciprocating motion in the pumping channel along a first axis so as to force fluid to flow from the inlet to the outlet by passing through the first hole.