Mechanically actuated pipette dispenser
First Claim
1. In a dispenser includinga pipette comprising means at a first end for containing liquid for dispensing, a compression chamber in fluid communication with said first end, compressing means, including a piston, for providing fluid compression within said chamber, and means for venting said chamber to the atmosphere, andactuating means including mounting means for receiving said pipette and for removably securing the compression chamber of said pipette in a fixed position and means for engaging and moving said compressing means by a predetermined distance to dispense a fixed amount of liquid;
- the improvement wherein said actuating means includes moving and sealing means, operable during receipt of said pipette, for sequentially;
(1) moving said piston with said chamber in a vented condition, to a predetermined starting position relative to said mounting means while said actuating means is stationary with respect to said compression chamber, and (2) thereafter sealing said venting means,whereby said piston is automatically initialized without dispensing any of the liquid contained by said pipette.
1 Assignment
0 Petitions
Accused Products
Abstract
A liquid dispenser is disclosed, comprising a vented pipette and an actuator for the pipette. The actuator includes apparatus for mounting the pipette and a mechanism for automatically lowering a piston into the pipette to a predetermined starting level before the pipette vent is sealed, to insure that a predictable quantity of liquid is dispensed once the vent is sealed.
-
Citations
8 Claims
-
1. In a dispenser including
a pipette comprising means at a first end for containing liquid for dispensing, a compression chamber in fluid communication with said first end, compressing means, including a piston, for providing fluid compression within said chamber, and means for venting said chamber to the atmosphere, and actuating means including mounting means for receiving said pipette and for removably securing the compression chamber of said pipette in a fixed position and means for engaging and moving said compressing means by a predetermined distance to dispense a fixed amount of liquid; -
the improvement wherein said actuating means includes moving and sealing means, operable during receipt of said pipette, for sequentially;
(1) moving said piston with said chamber in a vented condition, to a predetermined starting position relative to said mounting means while said actuating means is stationary with respect to said compression chamber, and (2) thereafter sealing said venting means,whereby said piston is automatically initialized without dispensing any of the liquid contained by said pipette. - View Dependent Claims (2, 3, 4)
-
-
5. Actuating means for dispensing a fixed amount of liquid from a pipette having means at one end for containing the dispensable liquid, a compression chamber in fluid communication with said containing means, compressing means, including a piston movably mounted within said chamber, for providing compression within said chamber, and means for venting the pipette to the atmosphere;
-
the actuating means comprising means for receiving said pipette and for removably mounting said compression chamber in a fixed position, means for engaging and moving said piston a predetermined distance to dispense a fixed amount of liquid, and means, operable during receipt of said pipette, for sequentially;
(1) moving said piston with said chamber in a vented condition, to a predetermined starting position relative to said mounting means while said actuating means is stationary with respect to said compression chamber, and (2) thereafter sealing said venting means,whereby said piston is automatically initialized without dispensing any of the liquid contained by said pipette. - View Dependent Claims (6, 7, 8)
-
Specification