Dispensing – With recorder – register – indicator – signal or exhibitor – Position or extent of motion indicator
Patent
1988-01-25
1990-03-27
Skaggs, H. Grant
Dispensing
With recorder, register, indicator, signal or exhibitor
Position or extent of motion indicator
222 49, 222137, 222389, 222334, B67D 522
Patent
active
049113283
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.
REFERENCES:
patent: 2692706 (1954-10-01), Wikstern
patent: 2767885 (1956-10-01), Miller
patent: 3749284 (1973-07-01), Kloehn
patent: 3980209 (1976-09-01), Collar
patent: 4356938 (1982-11-01), Kayser
patent: 4426024 (1984-01-01), Hogan et al.
patent: 4471888 (1984-09-01), Herb
patent: 4676410 (1987-06-01), Flue
patent: 4690306 (1987-09-01), Staheli
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