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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||60/369 ; 60/372 ; 60/387 ; 91/275|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 10 인용 특허 : 0|
A pumping unit for a well pump has a surface main cylinder with a main piston reciprocable therein, the piston having a connection to a standard well pump. In a flow cylinder of a relatively large diameter, a flow piston reciprocates within and divides the flow cylinder into a first flow chamber and a second flow chamber. The first flow chamber is in communication with the main cylinder. Air under pressure substantially to counterbalance the load on the well pump connection is supplied to the second flow chamber. There is a drive cylinder divided into a ...
A pumping unit for a well pump comprising a main cylinder, a main piston reciprocable in said cylinder, means for connecting said piston to said well pump, a flow cylinder having a predetermined diameter, a flow piston reciprocable in said flow cylinder and dividing said flow cylinder into a first flow chamber and a second flow chamber, means for connecting said first flow chamber to said main cylinder, means for supplying air under pressure to said second flow chamber, a drive cylinder, a drive piston reciprocable in said drive cylinder and dividing sai...