Emulsion pump with an air channel preventing liquid entrance

Details Emulsion pump with an air channel preventing liquid entrance Emulsion pump with an air channel preventing liquid entrance

2005-05-10

2005-05-10

Freay, Charles G. (Department: 3746)

Pumps

Miscellaneous

C222S321700, C222S321900

Reexamination Certificate

active

06890162

ABSTRACT:
An emulsion pump mainly comprises a piston rod, a pressing head, a screw-topped sleeve, a cylinder, a spring, a rubber pipe and a gasket. Among them, the upper screw thread of the cylinder engages with a screw thread portion of the screw-topped sleeve. The width of the teeth of the upper end screw thread of the cylinder is A, the width of the gullet the screw thread portion of the screw-topped sleeve which is connected with the screw thread of the cylinder is B, and B is greater than A, thereby a gap exists between them; in addition, a gap is also formed between the contact surface of the upper end of the cylinder and the lower surface of the top portion of the screw-topped sleeve, thereby an air channel for preventing liquid entrance is formed in the emulsion pump.

REFERENCES:
patent: 5570819 (1996-11-01), Uehira et al.
patent: 6036059 (2000-03-01), VanBrocklin
patent: 6196424 (2001-03-01), Bougamont et al.
patent: 1136526 (1996-11-01), None
patent: 2242132 (1996-12-01), None
patent: 2314128 (1999-04-01), None
patent: 2371155 (2000-03-01), None

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