Patent ID: 7503222

Claim:
A measuring device system comprising: a bracket of a first measuring device that includes an adjustment cam; a condition responsive element of the first measuring device that includes an element inlet and an output end configured to produce motion in response to condition changes (i) received at the element inlet and (ii) to which the condition responsive element is sensitive; an amplifier that includes a sector arm, wherein the amplifier is secured to the output end of the condition responsive element for communicating correlated but amplified motion of the condition responsive element to an indicator shaft for operating a measuring device indicator relative to condition changes on a dial face of the first measuring device; an actuator that includes at least a first actuator segment that is positioned within an elongated slot of the sector arm for defining a pivot axis for the sector arm to enable amplifier operation; a second actuator segment of the actuator that is engagably pre-loaded against an adjustment cam to push and ride against a cam surface of the adjustment cam; and wherein the adjustment cam is configured and dimensioned so that the cam surface that pushes against the second actuator segment changes the position of the first actuator segment in the elongated slot of the sector arm when the adjustment cam is rotated to adjust the span of the first measuring device.