Patent ID: 9670921
Date: 2017-06-06
CPC Classifications: F04B,F16K

Claim:
1. A reciprocating drive mechanism, comprising: a spool assembly; and a spool housing; wherein said spool housing comprises a spool chamber; wherein said spool assembly is disposed in and reciprocally movable within said spool chamber; wherein said spool housing comprises a first seal, a second seal, and a third seal; wherein, when said spool assembly is disposed within said spool chamber of said spool housing, said first seal, said second seal, and said third seal divide said spool chamber into a distal chamber, an intermediate chamber, a supply chamber, and a proximal chamber, respectively, such that: wherein said spool assembly comprises a first spool vent; wherein said first spool vent is in fluid communication with said distal chamber; wherein said spool housing comprises a first housing vent having an inlet and an outlet; wherein an inlet of said first housing vent is in fluid communication with said intermediate chamber; and wherein said first spool vent is in fluid communication with said first housing vent when said spool assembly reciprocates within said spool housing and aligns an outlet of said first spool vent within said intermediate chamber, such that a fluid trapped within said distal chamber is allowed to escape said distal chamber and into said intermediate chamber to said first housing vent.