| 摘要 |
A standby aquarium pump is disclosed which contains a direct current power supply and relay means which will automatically connect this power supply to start the standby pump when alternating current power is interrupted causing the AC powered pump to stop operating. An alternate embodiment provides rectified alternating current as the normal power supply and the direct current power as a standby or auxiliary power source. A rotary direct current motor is employed to drive a reciprocating piston type air pump using an operating rod eccentrically mounted in a flywheel mounted on the motor drive shaft. Electric shock hazard is reduced by containing all 120 volt alternating current connections in a separate housing secured to the main housing. Thus, the main housing can safely be opened to install or replace the batteries by the user who will be exposed only to the low voltage direct current elements.
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