To provide a simple structure manual air pump of good air supply efficiency capable of delivery air in an outward stroke and a return stroke of a piston.
This manual air pump P provided with an air delivery port 2 on a front end side of a cylinder 8 loaded with the piston 7, and delivering air from the air delivery port 2 by reciprocating the piston 7 with gripping a grip part 5 of the piston rod 4 projecting out rearward from the cylinder 8, is provided with an outward air discharge passage 26 leading air in a cylinder front chamber 8a out to an air delivery port 2 via a check valve 18C during outward stroke of the piston 7, an outward air charging passage 15 leading fresh air into a cylinder rear chamber 8b via a check valve 18A during return stroke of the piston 7, and a return stroke air charging passage 24 leading fresh air into the cylinder front chamber 8a via the check valve 18B during return stroke.
JP2003328932A | 2003-11-19 | |||
JPS6314877U | 1988-01-30 | |||
JP16006820Y | ||||
JPS59190980U | 1984-12-18 |
Yoshihito Shimizu
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