Apparatus for drawing liquids into, and expelling liquids from, a pipette or the like

Claim 2

Apparatus for drawing liquids into, and expelling liquid from, a pipette or the like including: a. a U-shaped body member, b. the central portion of said U-shaped body member comprising a hand grip, c. the leg portions of said U-shaped body member comprising spaced support means for the pipette, d. means for holding the pipette in engagement with said leg portions, e. a vacuum source, f. a pressure source, g. duct means extending through said body member connecting one end of the pipette with said vacuum source and pressure source, and h. a pair of valve members carried by the hand grip in communication with said duct means, i. one of said valve members being operative to place one end of the pipette in communication with said vacuum source, j. the other of said valve members being operative to place one end of the pipette in communication with said pressure source.

Claim 3

The apparatus of claim 1, wherein: a. each of said valve members includes a valve bore, b. a plunger operable within said valve bore, c. spring means for normally urging said plunger to the raised, inoperative position, and d. a groove in the periphery of said plunger, e. means for preventing communication between said groove and said duct means when said plunger is in the raised, inoperative position, f. said groove establishing communication with said duct means when said plunger is depressed.

Claim 4

The apparatus o claim 2, wherein: a. the plunger of each of said valve members extends from said hand grip in underlying relation with two fingers of the hand engaging said hand grip.

Claim 5

The apparatus of claim 3 with the addition of: a. means for controlling the rate of flow through said duct means to the pipette when the plunger is depressed.

Claim 6

The apparatus of claim 4, wherein: a. said means for controlling the rate of flow through said duct means includes a longitudinal groove in the peripheral wall of said plunger, b. said groove extending longitudinally of said valve member, c. the depth of said groove being reduced from top to bottom to permit a gradual increase in flow through said duct means as the plunger of said valve member is depressed.

Claim 7

Apparatus for drawing liquids into, and expelling liquids from, a pipette or the like including: a. a body member of substantially U-shaped configuration, b. the central prtion of said U-shaped body member comprising a hand grip, c. the leg portion of said U-shaped body member comprising spaced support means for the pipette, d. a vacuum source, e. a pressure source, f. duct means connecting one end of the pipette to said vacuum source and pressure source, and g. valve means carried by said hand grip portion and operatively engaged with said duct means for selectively placing one end of the pipette in communication with said vacuum source and pressure source.

Claim 8

Apparatus for drawing liquids into, and expelling liquids from, a pipette or the like including: a. a body member of substantially U-shaped configuration, b. the central prtion of said U-shaped body member comprising a hand grip, c. the leg portion of said U-shaped body member comprising spaced support means for the pipette, d. a vacuum source, e. a pressure source, f. duct means connecting one end of the pipette to said vacuum source and pressure source, and g. valve means carried by said hand grip portion and operatively engaged with said duct means for selectively placing one end of the pipette in communication with said vacuum source and pressure source.

Claim 9

The apparatus of claim 6, wherein: a. the terminal of one of said leg portions is transversely arcuate to complement and receive a portion of the pipette periphery, and b. means carried by said one of said leg portions engageable with the pipette for holding the latter in position.

Claim 10

Apparatus for drawing liquids into, and expelling liquids from, a pipette or the like including: a. a body member, b. said body member including a hand grip portion and a pipette supporting portion, c. a vacuum source, d. a pressure source, e. duct means connecting one end of the pipette to said vacuum source and pressure source, f. valve means carried by said hand grip portion and operatively engaged with said duct means for selectively placing one end of the pipette in communication with said vacuum source and presSure source, g. said valve means including a pair of valve members, h. each of said valve members comprising a valve bore and a plunger within the valve bore, i. the valve bores of said pair of valve members being in communication with the pipette and said pressure source and vacuum source respectively. j. means for normally urging each plunger to a raised inoperative position in the valve bore, k. means in the valve bores of said valve members for preventing communication between the pipette and said pressure source and vacuum source respectively when said plunger is in the raised, inoperative position, and l. means carried by each of said plungers for establishing communication between the pipette and said pressure source and vacuum source respectively when the plunger is depressed within the valve bore.

Claim 11

Apparatus for drawing liquids into, and expelling liquids from, a pipette or the like including: a. a body member, b. said body member including a hand grip portion and a pipette supporting portion, c. a vacuum source, d. a pressure source, e. duct means connecting one end of the pipette to said vacuum source and pressure source, f. valve means carried by said hand grip portion and operatively engaged with said duct means for selectively placing one end of the pipette in communication with said vacuum source and presSure source, g. said valve means including a pair of valve members, h. each of said valve members comprising a valve bore and a plunger within the valve bore, i. the valve bores of said pair of valve members being in communication with the pipette and said pressure source and vacuum source respectively. j. means for normally urging each plunger to a raised inoperative position in the valve bore, k. means in the valve bores of said valve members for preventing communication between the pipette and said pressure source and vacuum source respectively when said plunger is in the raised, inoperative position, and l. means carried by each of said plungers for establishing communication between the pipette and said pressure source and vacuum source respectively when the plunger is depressed within the valve bore.

Claim 12

The apparatus of claim 8, wherein: a. said means for normally urging each plunger to a raised inoperative position comprises a spring member.

Claim 13

The apparatus of claim 9, wherein: a. said means in the valve bore for preventing communication between the pipette and said pressure source and vacuum source respectively comprise sealing members interposed between said plunger and said body member.

Claim 14

The apparatus of claim 8, wherein: a. said means carried by each of said plungers for establishing communication between the pipette and said pressure source and vacuum source respectively comprises a groove in the periphery of each of said plungers, b. said groove establishing communication with said duct means when said plunger is depressed into the valve bore.

Claim 15

The apparatus of claim 11, with the addition of: a. means for controlling the rate of flow through said duct means to the pipette when the plunger is depressed.

Claim 16

The apparatus of claim 12, wherein: a. said means for controlling the rate of flow through said duct means includes a longitudinal groove in the periphery of each of said plungers, b. the depth of said longitudinal groove being progressively more shallow from the top to the bottom thereof, whereby a gradual increase in flow through said duct means is effected as said plunger is depressed.

Claim 17

The apparatus of claim 13, wherein: a. said plunger extends outwardly from said hand grip in underlying relation with two fingers of the hand engaging said hand grip.