Patent ID: 11926070
Assignee: OREGON TOOL, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 12:
13. A chainsaw, comprising:
a power head that comprises an oiling mechanism;
a chain saw bar coupled to the power head at a first end such that it receives oil from the oiling mechanism; and
a saw chain disposed around a perimeter groove of the chain saw bar and coupled to the power head so that it receives rotational motion from the power head,
wherein the chain saw bar comprises:
first and second outer walls, each disposed on a side of an inner core and extending past a perimeter edge of the inner core, the perimeter groove defined by the first and second outer walls and perimeter edge,
a plurality of oil channels disposed within the inner core, each of the plurality of oil channels having a first end configured to receive oil from the oiling mechanism, and a second end terminating in an oil exit port located distal from the chain saw bar first end, and
a second end that houses a sprocket that engages with the saw chain, and

wherein at least one of the oil exit ports of one of the plurality of oil channels is located at the chain saw bar second end proximate to the sprocket and comprises a valve, wherein the valve is thermally sensitive such that the valve increasingly opens to allow for greater oil flow at a higher temperatures as compared to at a lower temperature.