Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...
Patent
1974-04-12
1976-03-02
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Plural pumps having separate drive motors, supply sources,...
417 40, 417 44, 320 2, F04B 4906
Patent
active
039415074
ABSTRACT:
A sump containing a conventional sump pump has a battery operated emergency pump. A trapped air pressure operated switch turns the emergency pump on when the water level rises excessively in the sump and an alarm signal is given. If the trapped air operated switch fails to turn the pump on, a non-mechanical float switch does so after a further rise in the liquid level in the sump and at the same time an emergency warning signal is produced. The float switch also turns on the emergency pump if that pump had not previously been turned on due to a malfunction in the trapped air switch. When the emergency pump turns on, a battery charger is energized from the alternating current supply so as to prevent depletion of the battery so long as the alternating current is available. Normally, the battery charger is turned on periodically by a timer to maintain adequate battery charge on a regulated basis. If battery power fails alarm is actuated. An alarm is actuated when alternating current power failure occurs. Low level of battery electrolyte is indicated by an alarm. Provision is made for connection of sensors for other detrimental conditions, e.g., fire, burglar, freezer temperature, etc. Included in the alarm signals available is the actuation of an automatic telephone dialer to summon assistance.
REFERENCES:
patent: 2922854 (1960-01-01), Nielsen
patent: 3634842 (1972-01-01), Niedermeyer
patent: 3656866 (1972-08-01), Hine
patent: 3726606 (1973-04-01), Peters
patent: 3814544 (1974-06-01), Robert et al.
patent: 3867681 (1975-02-01), Bishop et al.
Freeh William L.
LaPointe S. P.
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