Programmable solvent delivery system and process

US4595495A · kind A · utility

Assignee

• Eldex Laboratories, Inc. · US

Inventors

• Reuben Yotam · Palo Alto, US
• Joseph G. Carleton · Palo Alto, US

Key dates

• Filing date: Feb 22, 1985
• Grant date: Jun 17, 1986
• Expiry date: Feb 22, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D11/132
• WIPO field: Measurement
• WIPO sector: Instruments

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…