Patent ID: 7421927

Claim:
A ratio regulating mechanism for a manually actuated action lever, comprising: a mounting comprising a first elongated guide; an action lever arm comprising a second elongated guide; a rotational shaft for rotatably mounting the action lever arm to the mounting, wherein the rotational shaft is relocatably mounted within the first elongated guide of the mounting and the second elongated guide of the action lever arm; a first adjustment means for relocating the rotational shaft relative to the action lever arm, the first adjustment means comprising an arm shaft supported in the action lever arm and first cam plates connected to the arm shaft and the rotational shaft, so that an adjustment rotation of the first cam plates relocates the rotational shaft relative to the action lever arm; and a second adjustment means for relocating the rotational shaft relative to the mounting, the second adjustment means comprising a support pin connected to the mounting, and second cam plates connected to the support pin and the rotational shaft, so that an adjustment rotation of the second cam plates relocates the rotational shaft relative to the mounting.