Manual air pump having selectable high pressure an

专利名称：Manual air pump having selectable high

pressure and low pressure modes

发明人：Scott Wu申请号：US09/499138申请日：20000207公开号：US06135733A公开日：20001024

摘要：A manual air pump includes a cylinder having a first chamber and a headprovided to the second end of the cylinder. The head includes an outlet passagecommunicated with the first chamber for supplying air to an object to be inflated. A firstpiston rod has a first end with a first piston slidably received in the first chamber. The firstpiston separates the first chamber into a first chamber section adjacent to the head and asecond chamber section distal to the head. The first piston rod defines a second chambertherein. A second piston rod has a first end with a second piston slidably received in thesecond chamber. The second piston separates the second chamber into a third chambersection adjacent to the first piston and a fourth chamber section distal to the first piston.A handle is secured to the second end of the second piston rod to move therewith.Reciprocating movement of the handle causes high volume/low pressure inflation whenthe handle is engaged with the first piston rod to allow joint sliding movement of the firstpiston rod and the second piston rod. Reciprocating movement of the handle causes lowvolume/high pressure inflation when the handle is disengaged from the first piston rodand the first piston rod is retained in the second end of the first chamber.

申请人：WU; SCOTT

代理人：AlanOppenheimer Wolff & Donnelly, LLP Kamrath

更多信息请下载全文后查看