A chainsaw having a drive motor. The chainsaw has a fixed part and a movable part. The guide bar is retained on the fixed part in a manner braced between the fixed part and a tensioning element. The movable part is shiftable in a longitudinal direction with respect to the fixed part in order to tension the saw chain with the tensioning element released. The chainsaw has a stop face and a tensioning face. At least one additional contact face that is firmly connected to the fixed part in the longitudinal direction and at least one additional contact face that is firmly connected to the movable part in the longitudinal direction are arranged between the stop face and the tensioning face. All the contact faces lie one after another in the flux of force from the tensioning element to the fixed part.

A chainsaw having a drive motor. The chainsaw has a fixed part and a movable part. The guide bar is retained on the fixed part in a manner braced between the fixed part and a tensioning element. The movable part is shiftable in a longitudinal direction with respect to the fixed part in order to tension the saw chain with the tensioning element released. The chainsaw has a stop face and a tensioning face. At least one additional contact face that is firmly connected to the fixed part in the longitudinal direction and at least one additional contact face that is firmly connected to the movable part in the longitudinal direction are arranged between the stop face and the tensioning face. All the contact faces lie one after another in the flux of force from the tensioning element to the fixed part.

A chain saw disclosed herein may include a motor configured to rotate a saw chain about a guide bar, a control unit configured to control a voltage applied to the motor, a body housing that houses the motor and the control unit, a battery detachably attached to the body housing, and a top handle provided above the body housing. The control unit may be disposed above the battery. In a rear view of the chain saw in a state where the chain saw is placed on a mount surface, the battery and the control unit may not overlap. In a top view of the chain saw in the state where the chain saw is placed on the mount surface, the battery and the control unit may overlap at least partially.

Herein a chainsaw (1) is disclosed comprising a guide bar (3) and a chain (5) moveably arranged around the guide bar (3). The chainsaw (1) comprises an motor (9) comprising a motor shaft (11), wherein the motor (9) is configured to drive the chain (5) via the motor shaft (11). The chainsaw (1) further comprises a tension estimation arrangement (13) configured to sense a load on the motor shaft (11), and configured to estimate the tension of the chain (5) around the guide bar (3) on the basis of the sensed load on the motor shaft (11). The present disclosure further relates to a method of estimating tension of a chain (5) of a chainsaw (1).

Chainsaws having chain tensioning biasing elements are provided. A chainsaw includes a housing comprising a geartrain; a guide bar extending from the housing; a chain moveably coupled around the geartrain and the guide bar; a motive device operatively coupled to the geartrain that selectively drives the geartrain to cause rotational movement of the chain around the guide bar; a tension adjustment assembly configured to selectively move the guide bar relative to the housing to adjust a tension in the chain; and a tension biasing element that continuously imparts an expansive force on the guide bar and/or the chain to oppose a loosening of the tension in the chain.

Chainsaws having chain tensioning biasing elements are provided. A chainsaw includes a housing comprising a geartrain; a guide bar extending from the housing; a chain moveably coupled around the geartrain and the guide bar; a motive device operatively coupled to the geartrain that selectively drives the geartrain to cause rotational movement of the chain around the guide bar; a tension adjustment assembly configured to selectively move the guide bar relative to the housing to adjust a tension in the chain; and a tension biasing element that continuously imparts an expansive force on the guide bar and/or the chain to oppose a loosening of the tension in the chain.

A chain saw includes a chain, a guide plate for supporting and guiding the chain, a main body comprising a power output unit configured for driving the chain to cut a workpiece, and a locking device configured for fixing the guide plate and tensioning the chain. The locking device includes a device housing, an operating member configured to be operated by a user to rotate about a first axis, a first locking member configured for locking or releasing the guide plate, and a first clutch assembly comprising a first clutch and a second clutch. The first clutch assembly has a first state and a second state, the first clutch is operative to transmit a rotation of the operating member to the second clutch when the first clutch assembly is in the first state, the first clutch is operative to stop transmitting the rotation to the second clutch and the first clutch assembly is operative to produce a relative displacement relative to the second clutch when the first clutch assembly is in the second state.

A chain saw includes a chain, a guide plate for supporting and guiding the chain, a main body comprising a power output unit configured for driving the chain to cut a workpiece, and a locking device configured for fixing the guide plate and tensioning the chain. The locking device includes a device housing, an operating member configured to be operated by a user to rotate about a first axis, a first locking member configured for locking or releasing the guide plate, and a first clutch assembly comprising a first clutch and a second clutch. The first clutch assembly has a first state and a second state, the first clutch is operative to transmit a rotation of the operating member to the second clutch when the first clutch assembly is in the first state, the first clutch is operative to stop transmitting the rotation to the second clutch and the first clutch assembly is operative to produce a relative displacement relative to the second clutch when the first clutch assembly is in the second state.

An outdoor tool includes a powerhead, a tool unit powered by the powerhead, and a shaft assembly extending between the powerhead and the tool unit. The tool unit includes a transmission housing, a support plate, a guide bar adjustably supported by the support plate, a drive gear, and a chain circumscribing a portion of the drive gear and a portion of the guide bar, the drive gear operatively coupled to the powerhead. The tool unit further includes a tension adjustment mechanism for adjusting a position of the guide bar relative to the drive gear to increase and decrease a tension in the chain. The tension adjustment mechanism includes an adjustment screw, a threaded adjustment bolt, at least one adjustment gear, and a member coupled to the adjustment bolt and the guide bar. Rotation of the adjustment screw causes translation of the guide bar relative to the drive gear.

A quick tensioning system applicable to handheld chainsaws is provided wherein, during chain re-tensioning, the chain guiding bar remains firmly anchored to the bar holder and guiding means are provided to retract the motorized driving sprocket versus said guiding bar. The system includes a guide interposed between a stationary bar holding body and a motor body. This allows a linear or a rotation relative movement between the sliding driving sprocket and the stationary guiding bar. A drive is provided by means of a screw that an operator can easily operate via a knob conveniently mounted nearby the chainsaw handle.