Dispensing – Plural sources – compartment – containers and/or spaced jacket – With discharge assistant for each source
Reexamination Certificate
1999-07-02
2001-02-06
Jacyna, J. Casimer (Department: 3751)
Dispensing
Plural sources, compartment, containers and/or spaced jacket
With discharge assistant for each source
C222S326000, C222S391000
Reexamination Certificate
active
06182867
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention refers to a manually operated dispensing device for use with a double cartridge for dispensing two-component chemical systems, the device comprising a double thrust ram comprising a toothing and a drive means jointly acting on the double thrust ram and being actuated by a trigger lever, said drive means having a drive member which comprises a toothing acting on the toothing of the double thrust ram, an arc compensating element being arranged between the drive member and the trigger lever, wherein the drive member is guided in such a manner.
Such a dispensing device is already known from EP-A-0,615,787 to the same Applicant. This device had certain advantages over the prior art known at that time in that it could be manufactured with lower cost parts from plastic materials due to the simultaneous meshing of a plurality of teeth. However, it has now been found that this device is still able to be substantially improved, and that in particular jamming, which is caused in the guide members by having a linear engagement movement, is a problem during the use under high dispensing forces. In addition, high jamming or tilting moments are created in that the driving dog must be guided with respect to the housing by an additional slider whose connecting link is disposed, particularly when the supply cylinders of the cartridges have the same or only slightly different diameters, in a disadvantageous manner below the center line of the reactive force, and that the lateral force impact point of cartridges having different diameters, especially widely different cylinder diameters, is not appropriately located. This results in all cases in a substantial loss of mechanical efficiency.
Another dispensing device has become known from U.S. Pat. No. 5,314,092, wherein the thrust rams acting on supply cylinders having different diameters are not symmetrically disposed but are offset to the side having the higher reactive forces; however, the driving arrangement is totally different from that of the present invention and does not provide a compensating link.
SUMMARY OF THE INVENTION
Starting from this prior art, it is an object of the present invention to provide a dispensing device which overcomes the disadvantages mentioned above when cartridges of the same as well as of widely different diameters are used, has a higher efficiency and a drive means less sensitive to becoming inoperable by contamination.
These objects are attained by a manually operated dispensing device wherein the drive member is guided in such a manner that it is hindered from making any tilting motion or any motion transversely to the advance direction during its advance stroke but can effect a swivelling motion for allowing its disengagement from the double thrust ram for its return stroke or for unlocking the double thrust ram for grip regain, the arc compensating element for the trigger lever being a compensating link connected for rotation at one of its ends through a first fulcrum upper pin to the trigger lever and at its other end through a second fulcrum pin to the drive member.
Special or preferred embodiments of the invention are defined in the dependent claims, especially also for cartridges having a diameter ratio of from 4:1 to 10:1.
A further object of the present invention is to provide a manually operated dispensing device having a return stop device that is better suited for maximizing the dispensed amount per stroke than the device of EP-A-0,615,787. This object-is attained by the device wherein the dispensing device comprises a return stop device having a locking slider acting on the toothing of the double thrust ram.
REFERENCES:
patent: 5137181 (1992-08-01), Keller
patent: 5314092 (1994-05-01), Jacobsen et al.
Foley & Lardner
Jacyna J. Casimer
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