Patent ID: 7870832

Claim:
A pressure indicating device, comprising: a case including a gas passage; a movable indicator carried by the case, having an end in fluid communication with the gas passage and having another indicator end, the indicator being movable longitudinally to an extended position when pressure in the gas passage is at least a predetermined minimum pressure and to a retracted position when below the predetermined minimum pressure; a spring to move the indicator to its retracted position when pressure in the gas passage is below the predetermined minimum pressure; a flag member carried by the case generally transversely to the longitude of the indicator and movable to first and second positions, the flag member being releasably retained in the first position by engagement with the flag member indicator end when the indicator is in its extended position due to the pressure in the gas passage being at least at the predetermined minimum pressure and movable to the second position upon disengagement by the indicator end when the indicator is in its retracted position due to the pressure in the gas passage being less than the predetermined minimum pressure; and the flag being yieldably biased toward its second position.