Patent ID: 9133831
Filing Date: 2015-09-15
Classification: F04B

Abstract:
1. A hand pump comprising: a housing including a chamber formed therein, and including an outlet provided therein, a piston slidably received and engaged in said chamber of said housing and movable along said chamber of said housing in a reciprocating action in order to pump and generate a pressurized air and to supply the pressurized air out through said outlet of said housing, a piston rod including an inner end portion attached to said piston for actuating said piston to move along said chamber of said housing in the reciprocating action, and including an outer end portion extendible out of said housing, a handle including a compartment formed therein for slidably receiving and engaging with said outer end portion of said piston rod at an inwardly folding position, and including a middle portion and a first end portion and a second end portion, and including a guiding passage formed in said second end portion of said handle, and including a stud extended from said middle portion of said handle and perpendicular to said handle and having a slot formed in said stud and communicating with said passage of said handle for selectively receiving and engaging with said piston rod and for allowing said piston rod to be rotated relative to handle between the inwardly folding position where said piston rod is received and engaged in said second end portion of said handle and an outwardly working position where said piston rod is engaged in said stud and perpendicular to said handle, and a barrel formed and provided in said first end portion of said handle, a shaft attached to said outer end portion of said piston rod, said barrel including a guiding channel formed therein for slidably receiving and engaging with said shaft and for guiding and limiting said shaft to slide and move in said barrel and in said first end portion of said handle, and a control ferrule slidably attached onto said piston rod for selectively engaging with said stud of said handle and for selectively anchoring and securing said piston rod to said housing at the outwardly working position.