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US 4,539,871 AGranted
Saw chain sharpener
AssigneeSimington Products Co.
InventorJack F. Simington
Life of this patent
Estimating the term…
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AssigneeSimington Products Co.
InventorJack F. Simington
Estimating the term…
An upstanding support is provided and a rotary grinding head is journaled from the upper end of the support for rotation about a vertical axis. A horizontally disposed support arm is pivotally mounted from the support at one end portion for swinging about a vertical axis and the other free end portion of the support arm has a grooved support wheel journaled therefrom for rotation about a horizontal axis extending transversely of the support arm. The grooved support wheel may have a saw chain trained thereover and the grooved support wheel, during oscillation of the support arm, is swingable into registry with diametrically opposite side portions of the rotary grinding head. Also, a chain tooth engaging and positioning member is supported from each of the opposite side portions of the support arm adjacent the grooved support wheel and swingable into and out of an operative position. When one side of the support arm is swung toward registry with one side of the rotary grinding head the positioning member on that side of the support arm is swung to the inoperative position and the positioning member on the opposite side of the support arm is utilized to engage and properly position a chain tooth on the upper periphery of the grooved support wheel for movement of that tooth toward engagement with the rotary grinding head.
A chain saw sharpener, said sharpener including a rotary grinding member, a support arm, means oscillatably mounting one end portion of said support arm for angular displacement about an axis generally paralleling and spaced from the axis of rotation of said grinding member, said support arm, at a location spaced therealong from said one end portion thereof, including support means for supporting a saw chain for guided shifting of at least a short lengthwise extending section thereof longitudinally of said support arm, positioning means supported from said support arm and engageable with said section of said chain to limit shifting of said section in at least one direction, the spacing between the axis of rotation of said grinding member and the axis of oscillation of said arm and the spacing of said support means along said support arm from the axis of oscillation of the latter being such so as to position said support means generally on radii of the axis of rotation of said rotary grinding member when said support arm is swung into positions closely adjacent opposite side portions of the periphery of said grinding member.
A chain saw sharpener, said sharpener including a rotary grinding member, support means for supporting a length of saw chain, means guidingly supporting said support means for oscillation, relative to the axis of rotation of said rotary grinding member, along a path of movement of predetermined extent, said path including opposite end portions directed at their terminal ends, inwardly toward the axis of rotation of said grinding member from positions along said path spaced outwardly of corresponding opposite side portions of the grinding member.
A saw chain sharpener, said sharpener including:
Dependencies are inferred from the claim text.