Internal-combustion engines – Lubricators – Crankcase – pressure control
Reexamination Certificate
2007-02-27
2007-02-27
Cronin, Stephen K. (Department: 3747)
Internal-combustion engines
Lubricators
Crankcase, pressure control
C184S027100
Reexamination Certificate
active
11166129
ABSTRACT:
An oil pump mechanism is incorporated in a chain saw having a centrifugal clutch and a saw chain adapted to be driven through the centrifugal clutch and activated in synchronization with the centrifugal clutch to supply a lubricating oil to the saw chain. The mechanism includes a crankshaft, a clutch shoe being mounted on the centrifugal clutch and being connected in driven relation to the crankshaft, a clutch drum disposed coaxially around the crankshaft, a worm fitted on the crankshaft by insertion in a freely rotatable manner and connected in driven relation to the clutch drum to be integrally rotated with the clutch drum, a driven gear engaged with the worm, and a movable pumping element for pumping the lubricating oil. The worm has an inner portion located opposed to the crankshaft and an outer portion including a tooth region. The inner portion is made of self-lubricating resin and the outer portion is made of wear-resistant metal.
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“Maschinenelemente”, Band I, 2. Auflage 1975, Von G. Niemann, pp. 320-323.
German Office Action dated Feb. 22, 2006.
Kawamura Kunimune
Uejima Tatsumi
Cronin Stephen K.
Kioritz & Corporation
Nixon & Peabody LLP
Studebaker Donald R.
Wilson Aaron N.
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