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Measured dose dispensing device

  • US 4,865,591 A
  • Filed: 06/10/1988
  • Issued: 09/12/1989
  • Est. Priority Date: 06/12/1987
  • Status: Expired due to Fees
First Claim
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1. A device for dispensing a controlled amount of fluid from a container, which device comprises an assembly adapted to be mounted upon a container in which a plunger is adapted to be moved axially along the container in increments so as to drive a piston within the container and thus to dispense fluid from the container characterised in that the assembly comprises a drive mechanism adapted to be reciprocated axially of the device and to be positively engaged with the plunger for the forward stroke of the drive mechanism so as to prevent relative movement between the plunger and the drive mechanism and to move the plunger forward in the container, which drive mechanism requires a positive action to disengage it from the plunger so as to permit relative movement of the plunger and drive mechanism for at least rearward movement of the drive mechanism;

  • in that the forward travel of the drive mechanism is limited by a fixed stop mechanism; and

    in that the extent of the forward stroke of the drive mechanism is selected by withdrawing the drive mechanism a selected distance from the said fixed stop.

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