The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 1986
Filed:
Feb. 22, 1985
Reuben Yotam, Palo Alto, CA (US);
Joseph G Carleton, Palo Alto, CA (US);
Eldex Laboratories, Inc., San Carlos, CA (US);
Abstract
A solvent delivery system (10) has first and second pistons (92, 94) and cylinders (58, 68) connected to first and second cams (110, 112). The cams (110, 112) each have a ramped portion (150, 162) and an abrupt step (152, 164). The first cylinder (58) is connected to solenoid valves (44, 46, 48) to fill the first cylinder with solvent components during movement of cam follower (104) along ramped portion (150) of the first cam (110). Spring (140) urges the first piston (92) forward into first cylinder (58). Movement of the cam follower (104) over the step (152) of the cam (110) moves the piston (92) forward abruptly to force the solvent components from cylinder (58) into second cylinder (68). Spring (178) urges piston (94) back in cylinder (68). The second cam (112) is reversed relative to first cam (110). Movement of cam follower (106) over abrupt step (164) of second cam (112) moves second piston (94) back abruptly in cylinder (68) to receive and mix the solvent components in the cylinder (68). Movement of cam follower (106) along ramped portion (162) of cam (112) moves piston (94) forward to force the solvent mixture from the second cylinder (68). A third piston (96) and cylinder (74) has a lesser volume than the first and second cylinders (58, 68). A third cam (114) and cam follower (108) move the third piston (96) back in cylinder (74) when second piston (94) moves forward in second cylinder (68). The second cylinder (68) delivers the solvent mixture to outlet (80) and fills third cylinder (74) while second piston (94) moves forward and third piston (96) moves back. The third cylinder (74) delivers the solvent mixture to outlet (80) while the third piston moves forward, the solvent component fills the first cylinder (58) and the first piston (92) and cylinder (58) fill the second cylinder (68). Check valves (60, 72, 78) prevent backflow in the system.