PRESSURE RELEASING CLOSURE FOR AN OIL RESERVOIR
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United States of America Patent
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Issued Date -
Nov 26, 2015
app pub date -
Nov 28, 2012
filing date -
Nov 28, 2012
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Abstract
A chainsaw (100) includes a power unit, a bar (120), a chain (122) operably coupled to the bar (120) to rotate around the bar (120) responsive to drive power from the power unit, an oil pump operably coupled to the power unit to deliver oil to the chain (122), an oil reservoir (150, 300, 400) and a cap (152, 200, 420). The oil reservoir (300) is configured to hold oil for delivery from the oil pump to the chain (122) and includes a fill opening (310) having a substantially circular shaped orifice in a portion of the oil reservoir (150, 300, 400). The oil cap (152, 200, 420) is configured to be securable into the fill opening (310) responsive to engagement between the oil cap (152, 200, 420) and the fill opening (310). The fill opening (310) defines an axial sealing surface (330, 460) and a radial sealing surface (340, 450). The axial sealing surface (330, 460) defines a continuous surface extending around a periphery of the fill opening (310). The radial sealing surface (340, 450) includes at least one cutout portion (350) forming a discontinuity in the radial sealing surface (340, 450 relative to a shape of the fill opening (310).
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