초록 ▼

An apparatus comprising a float vertically movable in a case, a driven member fitting to the float and having a movable attracting portion, upper and lower fixed attracting members disposed above and below the portion in opposed relation thereto, a stopper provided at a lower portion of the driven m

An apparatus comprising a float vertically movable in a case, a driven member fitting to the float and having a movable attracting portion, upper and lower fixed attracting members disposed above and below the portion in opposed relation thereto, a stopper provided at a lower portion of the driven member for supporting the load of the float, a reed switch magnetically operable by the approach or retreat of the movable portion, and a contactless switching element consisting essentially of a TRIAC and operable by the reed switch. The reed switch is instantaneously opened or closed and held opened or closed when water level reaches an upper limit or lower limit. The apparatus is useful for automatically controlling underwater pumps.

대표청구항 ▼

A device for operating an apparatus such as a pump for controlling a water level, comprising a housing, a switch mounted in said housing for starting and stopping the apparatus and having a magnetically influenced openable and closable contact, a float in said housing floatable on the water level to

A device for operating an apparatus such as a pump for controlling a water level, comprising a housing, a switch mounted in said housing for starting and stopping the apparatus and having a magnetically influenced openable and closable contact, a float in said housing floatable on the water level to be controlled and changing in level with the change of water level, a movable driven member associated with said float in said housing, means establishing a loss motion connection between said float and said driven member causing movement of said float upon change of water level by a predetermined amount before causing movement of said driven member in each direction of level change, said driven member having a magnetic actuator actuating the contacts of said switch positionable by movement of said float into a first position to locate said actuator in an area in which it influences said switch to cause its contacts to move to a selected one of an opened and closed position, and being movable to a second position spaced away from said first position upon movement of said float to a different level in which it influences said switch to move its contacts to the opposite direction of the selected position, holding means holding said magnetic actuator in said first and second positions by a predetermined holding force which may be overcome by movement of said float only after a predetermined change of level, said holding means comprising a pair of magnetic holders, one for holding said magnetic actuator in each of said first and second positions.