A vise for securing a chainsaw in a fixed position for field repairs and resharpening the cutting elements on the chain of a chainsaw. The vise is one piece body of generally rectangular shape with two upwardly projecting legs spaced wide enough to accept a chainsaw bar with one leg having a threaded hole and the opposing leg has a raised area. Protruding from the body downward is a tapered tang with serrated/ridges in the tapered side tang, the vise is then pushed into a piece of wood that has a slot cut into it with a chainsaw. the push vise provides a versatile device not limiting the user to just one surface, is safe to carry on your person and is easily and quickly anchored and removed.

A saw chain holder with a bar mounted sharpener for sharpening a chain includes a base plate and a cover plate removably attachable to the base plate. The base plate has a first base side surface, an opposite second base side surface, a groove extending into the first base side surface, and a base recess extending into the second base side surface. The cover plate has a first cover side surface and an opposite second cover side surface. The cover plate is movable into an assembled state in which the first cover side surface abuts the first base side surface, the chain is movable along the groove between the base plate and the cover plate, and the bar mounted sharpener is mounted in the base recess, bears against the second cover side surface, and is positioned over the groove.

Chainsaws and methods of operating chainsaws are provided. A chainsaw includes a guide bar supporting a chain; a motor configured to drive the chain, the motor receiving power from an electrical energy source of the chainsaw; a sprocket operably coupled between the motor and the chain to impart driving force from the motor to the chain; and an operating device operably coupled between the motor and the sprocket and moveable between a driving state and a neutral state, wherein the chain is freely moveable in at least one direction relative to the motor when the operating device is in the neutral state.

A saw chain holder with a bar mounted sharpener for sharpening a chain includes a base plate and a cover plate removably attachable to the base plate. The base plate has a first base side surface, an opposite second base side surface, a groove extending into the first base side surface, and a base recess extending into the second base side surface. The cover plate has a first cover side surface and an opposite second cover side surface. The cover plate is movable into an assembled state in which the first cover side surface abuts the first base side surface, the chain is movable along the groove between the base plate and the cover plate, and the bar mounted sharpener is mounted in the base recess, bears against the second cover side surface, and is positioned over the groove.

A saw chain holder for sharpening a chain with a bar mounted sharpener comprises a base plate and a cover plate removably attachable to the base plate. The base plate has a first base side surface, an opposite second base side surface, a groove extending into the first base side surface, and a base recess extending into the second base side surface. The cover plate has a first cover side surface, an opposite second cover side surface, and a cover recess extending into the second cover side surface. The cover plate is movable into an assembled state in which the first cover side surface abuts the first base side surface. The chain is movable along the groove between the base plate and the cover plate and the bar mounted sharpener is mounted in both the base recess and the cover recess and is positioned over the groove.

A saw chain holder for sharpening a chain with a bar mounted sharpener comprises a base plate and a cover plate removably attachable to the base plate. The base plate has a first base side surface, an opposite second base side surface, a groove extending into the first base side surface, and a base recess extending into the second base side surface. The cover plate has a first cover side surface, an opposite second cover side surface, and a cover recess extending into the second cover side surface. The cover plate is movable into an assembled state in which the first cover side surface abuts the first base side surface. The chain is movable along the groove between the base plate and the cover plate and the bar mounted sharpener is mounted in both the base recess and the cover recess and is positioned over the groove.

An operator operates a throttle lever and by maximizing the extent of said operation, the drive state is initiated, and the crank shaft rotation rate R increases and reaches the maximal value (RC) thereof. Subsequently, the operator operates the dressing operation lever so as to be in a second state at elapsed time (t0) while keeping the extent of the throttle lever operation maximized. Because a microswitch is turned off, the crank shaft rotation rate (R) is controlled in a range of R1<R<R2. By placing the saw chain in contact with a grindstone fixed to the dressing operation lever simultaneously with said action, dressing work is performed. After the microswitch is turned off at elapsed time (t0), the output of an ignition coil is controlled cyclically by a control unit at a cycle (T1+T2) so as to be on (ignition) during period (T1) and off (flame off) during period (T2).

An operator operates a throttle lever and by maximizing the extent of said operation, the drive state is initiated, and the crank shaft rotation rate R increases and reaches the maximal value (RC) thereof. Subsequently, the operator operates the dressing operation lever so as to be in a second state at elapsed time (t0) while keeping the extent of the throttle lever operation maximized. Because a microswitch is turned off, the crank shaft rotation rate (R) is controlled in a range of R1<R<R2. By placing the saw chain in contact with a grindstone fixed to the dressing operation lever simultaneously with said action, dressing work is performed. After the microswitch is turned off at elapsed time (t0), the output of an ignition coil is controlled cyclically by a control unit at a cycle (T1+T2) so as to be on (ignition) during period (T1) and off (flame off) during period (T2).