Automatic pump shutoff apparatus

Abstract

Abstract THE APPARATUS INCLUDES A TUBULAR HOUSING IN WHICH A STEM IS SLIDABLY MOUNTED. THE STEM CARRIES A PISTON, AND A SPRING IS ENCLOSED WITHIN THE HOUSING TO URGE THE STEM TO A POSITION SUCH THAT ONE END THEREOF IS ADAPTED TO ENGAGE AND ELECTRICALLY GROUND A SPARK PLUG OF A PUMP MOTOR FOR SHUTTING OFF THE MOTOR. A PRESSURE LINE FROM THE OUTLET OF THE PUMP IS CONNECTED INTO THE HOUSING, AND PRESSURE FROM THE PUMP OUTLET IS ARRANGED TO RETRACT THE PISTON AND HOLD THE STEM AWAY FROM THE SPARK PLUG. WHEN THE PUMP PRESSURE FALLS THE SPRING CAUSES THE STEM TO ENGAGE THE SPARK PLUG OF THE PUMP MOTOR TO SHUT THE MOTOR OFF AND PREVENT IT FROM RUNNING EXCESSIVELY WITHOUT A LOAD. GRAVITY OPERATED LATCH MEANS ARE ENGAGEABLE WITH THE STEM TO HOLD THE STEM RETRACTED WHILE THE PUMP MOTOR IS BEING STARTED AS WELL AS UNTIL SUCH TIME THAT PRESSURE BUILDS UP TO HOLD THE PISTON RETRACTED, THE LATCH BEING RELEASED AUTOMATICALLY WHEN A SELECTED PRESSURE HAS BEEN BUILT UP. THE PISTON HAS SURFACE O-RINGS FOR SEALING ENGAGEMENT WITH THE INTERIOR OF THE HOUSING IN A REARWARD DIRECTION OF THE LATTER AND FRONT SEALS ARE PROVIDED FOR SEALING IN A FORWARD DIRECTION. THE SHUTOFF APPARATUS OF THE PRESENT INVENTION MAY BE SUPPORTED ON THE PUMP MOTOR OR IF DESIRED IT MAY BE LOCATED REMOTELY FROM THE PUMP MOTOR AND OPERABLE TO ELECTRICALLY GROUND THE SPARK PLUG BY A CONNECTING WIRE.

Inventors

• 👤 Jack Edwards

Bibliographic Details