Abstract: A hybrid pipette including a pipette casing (11) and a slide shaft (22) vertically movable in response to the operation of a pushbutton (23). A plunger (31) is disposed below the slide shaft and urged upwardly by a spring (33, 34). An engagement member (41) is coaxially and movably fitted on the slide shaft (22) and extends through a hole (12a1) in a casing member (11) so as to be movable at least vertically. An electric motor (51) is provided on an axis different from the axis of the slide shaft and operatively engaged with the engagement member (41). In a manual operation mode, the slide shaft (22) and the plunger (31) move vertically in response to the operation of the pushbutton (23) to perform suction and discharge of a liquid. In a motor-driven operation mode, the engagement member (41) is driven to move vertically by the electric motor (51), whereby the plunger (31) is moved vertically to perform suction and discharge of a liquid.

Abstract: An apparatus for automatic distribution includes a frame (1) having at least a bottom frame portion (1a) and a side frame portion (1b), a tip holding rack (2) and at least one micro plate (4, 5) which are disposed on the bottom frame (1a). A pipette unit (21) is supported by the side frame portion (1b) and adapted to support a plurality of pipettes (43), each of which includes a plunger (41) fitted into a cylinder (35) for movement relative thereto in a vertical direction. In this apparatus the bottom frame portion (1a) is kept stationary and the entire pipette unit (21) can be reciprocally moved in a horizontal direction so that, while the entire pipette unit (21) is being moved reciprocally in the horizontal direction, the pipette unit picks up a plurality of tips (44) from the tip holding rack (2) in order to distribute liquid with respect to a plurality of wells (4a-4h) of the micro plate.

Abstract: A repetitive pipette wherein a rack shaft (23) vertically and movably provided in a pipette body (1) is connected to a plunger (43) of a syringe unit (41), and a vertically movable and pivotable pawl member (16) repetitively moves downward and meshes with the rack shaft (23) to feed the plunger (43) downward by a predetermined feed pitch at each time, thereby effecting repetitive pipetting, and wherein the predetermined feed pitch for the rack shaft (23) can be variably set by a pipetted quantity variably setting device. A vertically movable push button (2) is provided on the pipette body (1). A rotary control knob (3) for variably setting a pipetted quantity is provided in coaxial relation to the push button (2) so as to be vertically movable together with the push button (2) as one unit and rotatable relative to the push button (2). A pawl retaining member (12) for retaining the pawl member (16) is vertically movable together with the push button (2) as one unit.

Abstract: A multipipet designed to allow a plurality of cylinders to be supported by a supporting member in such a manner that each cylinder is individually oscillatable sideward relative to said supporting member. A multipipet designed to allow a plurality of plungers and a plurality of cylinders to be accommodated in a single housing and a gripping body to be attached to said housing through thread engagement.

Abstract: A variable pipette is disclosed which is so designed that its volumetric capacity for sucking and discharging a sample is variable. A first-stage stroke l.sub.1 for sucking and discharging a sample is defined between a first first-stage stop portion of a nut and a second first-stage stop portion of an actuating shaft, and this stroke l.sub.1 is set through the actuating shaft, a first stop portion of a threaded hollow shaft, the hollow shaft and the nut, not through any portion of the body of the pipette. Therefore, even if the temperature of the body is raised by the heat transmitted from the operator's hand as it grips the pipette and the body is thereby expanded axially, the above-described stroke l.sub.1 is independent of the expansion of the body and there is therefore hardly any error produced in the stroke l.sub.1.

Abstract: A repeating dispenser for dispensing uniform quantities of liquid includes an actuator rotatably connected to an actuating button. The actuator is biased upward by a spring towards a downwardly facing abutment in the non-actuated condition of the dispenser and is connected through a vertically displaceable rack shaft to a slide which releaseably mounts a cylinder piston device comprising a plurality of identical pistons and cylinders. An operating rod connects the slide to a suction button which is slideable along the outside surface of the dispenser. A pawl cooperates with the rack shaft and is kept from engagement with the rack shaft in the non-actuated condition of the dispenser. The actuating button includes a series of step-like stop portions engageable with an upwardly facing abutment to allow the repeated dispensing of uniform quantities of liquid.

Abstract: A pipette device adapted to removably mount a tip at its lower end and having a housing in which there are provided a cylinder chamber communicating with the interior of the mounted tip, a plunger adapted to operate in the cylinder chamber for sucking a liquid and then discharging the same, a direct current motor coupled to the plunger through a plunger driving mechanism, and a potentiometer for producing a voltage signal representing the position of the plunger, so that sucking and discharging of the liquid can be effected by detecting the voltage signal produced by the potentiometer and controlling the direction and amount of the rotation of the motor by the utilization of such detected voltage signal. Also disclosed is a control device for use with the pipette device including a servo system for receiving the voltage signal produced by the potentiometer as a feedback signal and a sequence circuit adapted to change the balance-point of the servo system in a preselected sequence.

Abstract: A liquid dispensing device including a vertically mounted cylinder, a plunger slidably disposed in the cylinder, a cylindrical space having the inner diameter slightly larger than that of the cylinder being disposed contiguous to the lower end of the cylinder and coaxially therewith to receive the lower end portion of the plunger when the plunger is at the lowermost position a discharge passage communicating with the upper end of the cylindrical space, and a suction passage communicating with the lower end of the cylindrical space.

Abstract: A pipetting device including a vertical cylinder provided on the lower end portion of a cylindrical housing, a piston working in the cylinder, an actuating rod connected to the piston and extending vertically through the housing, an operating knob mounted on the upper end of the actuating rod, a return spring biassing upwards the actuating rod, and a hollow tip mounted removably on the lower end of the cylinder for receiving liquid therein. The opposite ends of the return spring are connected non-rotatably to the housing and the actuating rod respectively thereby the actuating rod is biassed angularly with respect to the vertical axis thereof. The device further includes guiding mechanism for controlling the downward movement of the actuating rod in normal operating condition and allowing an additional downward movement thereof when the actuating rod is rotated angularly whereby the tip is removed off from the pipetting device.

Abstract: A pipetting device including a cylinder disposed at the lower end portion of a cylindrical housing, a piston working in the cylinder and having a piston rod secured thereto to extend through the housing, an actuating knob secured to the upper end of the piston rod, and a return spring biassing the piston rod upwardly, wherein the device further comprises a sleeve fitted screw-threadingly in the housing and engaging with the piston rod slidably but non rotatably, locking means releasably preventing rotation of the sleeve in the housing, an elongated transparent window having a scale thereon and being formed in the housing, and a datum line formed around the outer periphery of the sleeve.

Abstract: A pipetting apparatus comprising a housing, a liquid receiving tube attached to the lower end of the housing and receiving a predetermined amount of a liquid sample therein, a cylinder piston device disposed in the housing for applying vacuum pressure on the upper end of the liquid receiving tube for sucking a liquid sample into the tube, a manually operable device for actuating the cylinder piston device, an air inlet for directing compressed air into the housing, and a manually operable valve for directing compressed air either to the upper end of the liquid receiving tube or to atmosphere.