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US 4,623,337 AGranted
Liquid dispensing apparatus
AssigneeAlpha Group Co., Ltd.
InventorDavid M. Maurice
Life of this patent
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AssigneeAlpha Group Co., Ltd.
InventorDavid M. Maurice
Estimating the term…
An apparatus (10) for the repetitive dispensing of a predetermined quantity of eyedrops (12) has a cylinder (14) with a restricted opening (18) at a first end (16). A plunger (20) attached to rod (23) extends into the cylinder (14) from end (22). Biasing member (28) has a ramped cam surface (32) incorporating a pair of steps (46), actuating member (26) has an opposed surface (30) with a projection (44) which rides on ramped cam surface (32) and drops off step (46) when actuating member (26) is rotated. Rotation of the actuating member (26) also advances the actuating member (26) on threaded member (24). Spring (42) biases surfaces (30) and (32) together. A projection (44) drops over each step (46), plunger (20) is moved incrementally toward end (16) of cylinder (14) to discharge eyedrops (12) through opening (18 ). A disposable cartridge (50) may be substituted for the cylinder (14).
Apparatus for the repetitive dispensing of a predetermined quantity of a liquid comprising a cylinder having a first end and a second end, the liquid to be dispensed within said cylinder, the first end of said cylinder having a restricted opening through which the liquid may pass in response to pressure applied to the liquid, a plunger extending into said cylinder from the second end, a plunger moving member operatively connected to said plunger for moving said plunger in steps toward the first end of said cylinder, an actuating member engaging said plunger moving member by means of opposed surfaces on each said plunger moving and actuating members, one of the opposing surfaces constituting a ramped cam having at least one step and the other of the opposing surfaces having at least one projection engaging the ramped cam opposing surface, and means for biasing said opposed surfaces toward one another, said plunger moving and actuating members being rotatable with respect to each other, the opposing surfaces being configured and positioned so that rotation of said plunger moving and actuating members with respect to each other moves the projection on the ramped cam opposing surface, and movement of the projection over the stop advances said plunger toward the one end a distance corresponding to the step length.
Apparatus for the repetitive dispensing of a predetermined quantity of a liquid comprising a cylinder having a first end and a closed second end, the first end of said cylinder having a restricted opening through which the liquid may pass in response to pressure applied to the liquid, at least one of the first and second ends being movable within the cylinder toward the other end to change volume of a space defined by the cylinder and containing the liquid, an end moving member operatively connected to the second end for moving the ends in steps toward one another, an actuating member engaging said end moving member by means of opposed surfaces on each said end moving and actuating members, one of the opposing surfaces constituting a ramped cam having at least one step and the other of the opposing surfaces having at least one projection engaging the ramped cam opposing surface, and means for biasing said opposed surfaces toward one another, said end moving and actuating members being rotatable with respect to each other, the opposed surfaces being configured and positioned so that rotation of said end moving and actuating members with respect to each other moves the projection on the ramped cam opposing surface, and movement of the projection over the step advances the ends toward one another a distance corresponding to the step length.
Dependencies are inferred from the claim text.