Importance

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Abstract

The dispensing appliance customarily built in 'pistol form' for double cartridges with plunger has a pressure medium-driven cylinder/piston unit with rams extending from the piston for the forward drive of the plungers. The problem here consists in that during the piston forward thrust the reaction forces from the plungers acting upon the rams can be very different (different viscosities of the substances contained in the two cartridge cylinders and/or different cross-sections of the cartridge cylinders). In order to prevent 'tilting' or jamming of the piston, the invention provides in a cylinder space a rigid longitudinal guide between both cylinder floors against which the piston is slidingly supported with a longitudinally extended guide bore. The longitudinal guide can simultaneously reinforce the cylinder and further lead the pressure medium into the pressure chamber behind the piston by way of a longitudinal channel. In this connection, rapid ventilation for the pressure chamber as well a control mechanism for guiding the piston unit back to its starting position are described. Further, a retrieval mechanism for the piston for ram relief after each forward thrust step as well as indicator elements for the cartridge fill-level are disclosed.

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First Claim