Battery powered vacuum unit
First Claim
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1. A portable vacuum unit for use in field filtrations, and unit comprising:
- (a) a housing having therein a generally upright piston pump and a direct current electric motor for driving said pump, said pump including a cylinder having a reciprocable piston therein, an inlet port for air under reduced pressure and an outlet port for exhausting air to the atmosphere;
(b) a tubular connection extending through a wall of said housing for attachment of a suction line;
(c) a vacuum line extending from said tubular connection to said inlet port of said piston pump, said vacuum line including a water trap;
(d) means for introducing a lubricant into said cylinder without removal of any wall of said housing;
(e) means for allowing automatic intermittent operation of said motor during operation of said vacuum unit; and
(f) means for maintaining full time suction in said vacuum unit during said intermittent operation of said motor.
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Accused Products
Abstract
Battery powered vacuum unit, useful for suction filtration of water samples in the field. The vacuum unit comprises a miniature piston type air suction pump, driven by a small direct current (DC) motor which in turn is powered by a battery or other 12 volt DC power source. The motor may be controlled by a timer. The motor has a maximum power requirement of about 75 Watts and the suction pump has the ability to produce a vacuum of at least about 12.5 mm of mercury. The entire unit is preferably self-contained in a single housing, and preferably weighs no more than about 5 kilograms (11 pounds).
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Citations
18 Claims
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1. A portable vacuum unit for use in field filtrations, and unit comprising:
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(a) a housing having therein a generally upright piston pump and a direct current electric motor for driving said pump, said pump including a cylinder having a reciprocable piston therein, an inlet port for air under reduced pressure and an outlet port for exhausting air to the atmosphere; (b) a tubular connection extending through a wall of said housing for attachment of a suction line; (c) a vacuum line extending from said tubular connection to said inlet port of said piston pump, said vacuum line including a water trap; (d) means for introducing a lubricant into said cylinder without removal of any wall of said housing; (e) means for allowing automatic intermittent operation of said motor during operation of said vacuum unit; and
(f) means for maintaining full time suction in said vacuum unit during said intermittent operation of said motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A portable vacuum unit capable of being carried from place to place by hand, said unit comprising:
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(a) a vacuum pump comprising an inlet port for air under reduced pressure and an outlet port for exhausting air to the atmosphere; (b) a direct current motor for driving said vacuum pump; (c) a vacuum line connected at its outlet end to said inlet port, and said vacuum line including an inlet connection and a water trap; said vacuum pump, motor and water trap being housed in a single portable housing; and (d) a timer circuit for turning said motor on and off in predetermined timed sequence, said timer circuit being housed in said housing and including a pair of multi-vibrators, each controlled by resistor means and a capacitor forming an RC circuit and a pair of transistors constituting a darlington pair.
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Specification