Pumps – With signal – indicator – or inspection means
Patent
1995-12-22
1998-08-04
Freay, Charles G.
Pumps
With signal, indicator, or inspection means
417 53, 417553, 73730, F04B 2100, F04B 2104
Patent
active
057884633
ABSTRACT:
A vacuum system comprising a vacuum pump and a vacuum indicator. The vacuum pump comprises a cylinder, a piston disposed in the cylinder, a piston rod fixed to the piston and extending through an end of the cylinder, the rod being movable reciprocally, a sealing ring disposed on and around the piston and in engagement with an inside wall of the cylinder, and stops extending radially outwardly from the piston, the stops including a proximal stop and a distal stop, the sealing ring being axially movable between the proximal and distal stops, the piston having an axially-extending groove therein, the groove extending from proximal of the distal stop to proximal of the proximal stop, whereby upon movement of the piston in a first direction, the sealing ring engages the distal stop and seals an annular space between the piston and the inside wall of the cylinder, and upon movement of the piston in a second direction, the sealing ring engages the proximal stop and leaves unobstructed the axially-extending groove. The vacuum indicator comprises an elongated tubular member for disposal in a vacuum line between the vacuum pump and a housing which is to be evacuated, the tubular member being made of an elastic material, with a wall of the tubular member having a uniform thickness of greater than 1/5 of an inside radius of the tubular member.
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