The present invention refers to a motor saw arrangement comprising a support plate attached to the motor saw chassis or motor saw motor, a detachable clamping plate and a detachable guide bar arranged between the support plate and the clamping plate. The support plate is provided with two first recesses and at least one threaded hole, while the clamping plate is provided with two protrusions adapted to fit inside the respective two first recesses when the clamping plates is attached to the support plate and the protrusions each have a height that exceeds a corresponding height of the guide bar. The guide bar is provided with two keyhole-shaped slots and with a longitudinal slit between the two keyhole-shaped slots and the support plate is further provided with an alignment means. The invention further relates to a method to remove and/or replace a saw chain from a guide bar and to a guide bar intended and adapted for the motor saw arrangement described herein.

The present invention is directed to a chain saw having a chain tension knob to adjust the tension of a chain. The knob is rotated to move the chain bar to increase or decrease the tension on the chain depending on the direction of rotation. The knob is positioned at a forward portion of the chainsaw housing, below the chain bar. The knob acts as a chain catcher so that in case of chain breakage or derailment, it blocks the chain from swinging rearward toward the user and reduces the likelihood of serious injury.

The present invention is directed to a chain saw having a chain tension knob to adjust the tension of a chain. The knob is rotated to move the chain bar to increase or decrease the tension on the chain depending on the direction of rotation. The knob is positioned at a forward portion of the chainsaw housing, below the chain bar. The knob acts as a chain catcher so that in case of chain breakage or derailment, it blocks the chain from swinging rearward toward the user and reduces the likelihood of serious injury.

A chain saw, arranged with a guide plate and a chain. The chain saw includes a housing, a drive assembly arranged in the housing, and a fixing assembly tensioning the chain and locking the guide plate. The fixing assembly includes a shield abutting against the guide plate, a knob arranged on an outside of the shield, a tensioning member driven by the knob, a locking member snapped to the shield, and an elastic member disposed between the knob and the locking member. A side of the shield facing the locking member is arranged with a first clamping part, and a side of the locking member facing the shield is arranged with a second clamping part; in condition of the guide plate being locked, the elastic member deforms and abuts against the locking member, causing the second clamping part to snapped to the first clamping part.

A chain saw, arranged with a guide plate and a chain. The chain saw includes a housing, a drive assembly arranged in the housing, and a fixing assembly tensioning the chain and locking the guide plate. The fixing assembly includes a shield abutting against the guide plate, a knob arranged on an outside of the shield, a tensioning member driven by the knob, a locking member snapped to the shield, and an elastic member disposed between the knob and the locking member. A side of the shield facing the locking member is arranged with a first clamping part, and a side of the locking member facing the shield is arranged with a second clamping part; in condition of the guide plate being locked, the elastic member deforms and abuts against the locking member, causing the second clamping part to snapped to the first clamping part.

A chainsaw including a body including a bar stud extending therefrom; a guide bar including a bar stud slot that receives the bar stud, wherein the bar stud slot has a length, and wherein the guide bar is configured to receive a chain; a yoke having a groove defining a length extending in a direction angularly offset from the length of the bar stud slot of the guide bar, wherein the yoke is coupled to the guide bar; a ratchet gear including a one-way motion feature and a post extending into the groove of the yoke, wherein rotating the ratchet gear in a first direction moves the guide bar to tighten the chain, and wherein rotating the ratchet gear in a second direction moves the guide bar to loosen the chain; and a pawl selectively engaged with the one-way motion feature of the ratchet gear.

A chainsaw including a body including a bar stud extending therefrom; a guide bar including a bar stud slot that receives the bar stud, wherein the bar stud slot has a length, and wherein the guide bar is configured to receive a chain; a yoke having a groove defining a length extending in a direction angularly offset from the length of the bar stud slot of the guide bar, wherein the yoke is coupled to the guide bar; a ratchet gear including a one-way motion feature and a post extending into the groove of the yoke, wherein rotating the ratchet gear in a first direction moves the guide bar to tighten the chain, and wherein rotating the ratchet gear in a second direction moves the guide bar to loosen the chain; and a pawl selectively engaged with the one-way motion feature of the ratchet gear.

A concrete cutting machine includes a motor, a pivot arm, and a concrete cutting chain assembly. The motor has an output drive, and the pivot arm has an input coupled to the output drive for receiving power from the motor. The arm is configured to pivot relative to the motor, and the pivot arm has a pivot arm output. The concrete cutting chain assembly is supported on the pivot arm and has a power input coupled to the pivot arm output. The chain assembly is configured to be pivotable relative to the pivot arm.

A concrete cutting machine includes a motor, a pivot arm, and a concrete cutting chain assembly. The motor has an output drive, and the pivot arm has an input coupled to the output drive for receiving power from the motor. The arm is configured to pivot relative to the motor, and the pivot arm has a pivot arm output. The concrete cutting chain assembly is supported on the pivot arm and has a power input coupled to the pivot arm output. The chain assembly is configured to be pivotable relative to the pivot arm.

A chain saw includes a housing, a motor, a chain saw bar assembly, a tensioning assembly set on the housing, and an adjustment assembly set on the side cover corresponding to the tensioning assembly. The chain saw bar assembly is detachably connected to the first housing through the combination of the tensioning assembly and the elastic components, the adjustment assembly is movably connected with the tensioning assembly, and the adjustment assembly can adjust the relative position of the tensioning assembly and the guide shaft, to tension the chain set on the circumferential direction of the guide bar and tightly lock the chain saw bar assembly between the first housing and the side cover.