Governor sheave with an overlapping flyweight system

摘要

A mechanism for use in an elevator governor assembly including a ground configured to rotate about a ground axis, three or more circumferentially overlapping cams each pivotally attached to the ground at one of three or more ground pivot points radially spaced from the ground axis, and a plurality of links pivotally attaching the three or more cams to one another at a plurality of link pivot points. The circumferentially overlapping cams form a substantially contiguous circular ring about the ground axis. The interconnection of the ground, the cams, and the links form a generally circular mechanism.

主权项

1. An elevator governor assembly comprising:
a ground configured to rotate about a ground axis of rotation; three circumferentially overlapping cams each pivotally attached to the ground at one of three ground pivot points radially spaced from the ground axis of rotation, wherein a first end of each cam is positioned side-by-side and overlapping along an axis parallel to the ground axis of rotation with a second end of an adjacent cam so that radially outer edges of the cams form a substantially contiguous circular ring about the ground axis of rotation, wherein the axis parallel to the ground axis of rotation passes through the first end of a first cam and the second end of a second cam; a plurality of links pivotally attaching the three cams to one another at a plurality of link pivot points to form a generally circular mechanism; a sensor positioned radially outward of the substantially contiguous circular ring that can be engaged when one of the cams contacts the sensor to signal a change in state; a coupler separate from the plurality of links, the coupler configured to inhibit the generally circular mechanism from increasing in diameter about the ground axis of rotation at ground angular velocities less than a first velocity and to permit the generally circular mechanism to increase in diameter about the ground axis of rotation as a function of angular velocity at velocities greater than or equal to the first velocity; and wherein the plurality of link pivot points are positioned radially outwardly of the three overlapping cams relative to the ground axis of rotation.