Patent ID: 9403226
Filing Date: 2016-08-02
CPC Classification: B23D,B27B

Claim Text:
1. A chain saw, comprising: a housing; a saw chain; an oil supply system disposed in the housing, the oil supply system comprising an oil can and an oil pump assembly for supplying oil to the saw chain connected with the oil can via an oil inlet tube; a switch for turning on and off the chain saw; a trigger linkage assembly mounted in the housing for controlling the switch, the trigger linkage assembly comprising a switch trigger, a trigger linkage rod driven by the switch trigger, and a torsion spring disposed on a pivot point of the trigger linkage rod, wherein the trigger linkage rod is rotatable relative to the housing, the switch trigger is capable of triggering the switch via the trigger linkage rod, and the trigger linkage rod is biased by the torsion spring in a direction away from a direction of triggering the switch; and a pressing member having a pressing surface positioned on the trigger linkage rod wherein the pressing member contacts the oil net tube to compress the oil net tube when the pressing member is located at a first position to isolate an oil circuit of the oil supply system when the switch trigger is not activated and, when the switch trigger is activated, the pressing member is driven by the trigger linkage assembly to a second position to release the oil net tube so that the oil circuit of the oil supply system is allowed to flow therethough, wherein the trigger linkage rod is driven by the switch trigger and is rotatable relative to the housing, and the torsion spring is disposed on the pivot point of the trigger linkage rod, wherein the switch trigger is pivotable about the pivot point to a triggering position where the trigger linkage rod triggers the switch, and the trigger linkage rod is biased by the torsion spring in a direction away from the triggering position, wherein the trigger linkage rod comprises a first swing arm and a second swing arm respectively formed at two ends thereof and a sway arm formed on the switch trigger, the sway arm of the switch trigger driving the first swing arm to turn the trigger linkage rod and thereby drive the second swing arm to rotate and trigger the switch, and wherein the chain saw further comprises a brake plate and a brake link rotatabiy connected with the brake plate, wherein the brake link comprises a protrusion directly contacting with the switch, and the switch trigger is capable of driving the protrusion on the brake link to trigger the switch.