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 repeating dispenser comprising a tubular main body, an actuating member slidably disposed in the main body with the upper end thereof projecting out of the upper end of the main body and having a pressure button thereon, a spring for biasing upwards the actuating member, a spring retainer slidably disposed in the main body and abutting normally with the lower end of the actuating member to transmit the biasing force of the spring to the actuating member, a stop provided on the inner surface of the main body for abutting with the spring retainer in the non-actuated condition of the dispenser, a pawl pivotally connected to the spring retainer, a pawl spring for biasing the pawl in the radially outward direction, a rack shaft slidably provided on a side surface of the main body and having a plurality of rack teeth thereon for engaging with said pawl, a device for preventing the pawl from engaging with the rack shaft when the spring retainer abutting with the stop, a suction button connected to the rack shaft a

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.