Attachment for a vacuum pump
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United States of America Patent
Stats
-
Jan 27, 2004
Grant Date -
Sep 26, 2002
app pub date -
Mar 13, 2002
filing date -
Mar 21, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An attachment (3) for a vacuum gun (2), for introducing new coolant into a cooling system of a vehicle after spent coolant has been drained from the cooling system. The attachment (3) comprises: a body (4) having a first inlet (36) for air left in the cooling system of the vehicle after spent coolant has been drained from the cooling system; a second inlet (37) for the new coolant; an outlet (38); a passage (39) connecting the outlet (38) to each of the inlets (36, 37); and, a jumper valve (40) located within the passage (39). The jumper valve (40) is moveable between a first closed position and a second open position, and it is biased with a coil spring (41) to remain in the first position. Whilst a vacuum is applied to the attachment (3) by the vacuum gun (2), the jumper valve (40) is in the second position and air may be drawn from the cooling system to form a partial vacuum within the cooling system. The attachment (3) further comprises a tap (34) attached to the second inlet (37), a hose (35) extending from the tap (34) to a source of the new coolant, and a pressure gauge (33) for monitoring the pressure within the passage (39).
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