Pre-charged vacuum fluid change/disposal apparatus

Details Pre-charged vacuum fluid change/disposal apparatus Pre-charged vacuum fluid change/disposal apparatus

1995-02-28

1998-06-30

McAndrews, Roland

Pumps

One fluid pumped by contact or entrainment with another

Liquid pumped by supplying or exhausting gaseous motive...

184 15, 141 98, 137205, F16N 3300

Patent

active

057724024

ABSTRACT:
An apparatus and method of use thereof includes a rechargeable, pre-charged vacuum canister used to remove viscous fluids, e.g., waste oil, from containers such as engine crankcases through an opening, such as a dipstick tube. The self-contained canister is first pre-charged with a near absolute vacuum. Due to the compressibility characteristics of air, conventional, active, continuous pumping techniques, which rely on partial vacuums, do not achieve the pulling force of the near absolute vacuums achieved by the invention. The use of a self-contained, pre-charged near absolute vacuum canister system significantly increases the force applied to the viscous fluid to be extracted. Furthermore, the fluid can be simultaneously contained in a proper disposal container. As a result shortcomings of manual and electric pumping systems are overcome with the added advantage that no external pumping force is required at the site of fluid removal.

REFERENCES:
patent: 1986476 (1935-01-01), Ironside
patent: 2158914 (1939-05-01), Rinehart
patent: 3773091 (1973-11-01), Boyd et al.
patent: 4095672 (1978-06-01), Senese
patent: 4378026 (1983-03-01), Bauer
patent: 4807674 (1989-02-01), Sweet
patent: 4976235 (1990-12-01), Commanday

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