Dispensing – Plural sources – compartment – containers and/or spaced jacket – With discharge assistant for each source
Reexamination Certificate
1999-04-02
2001-02-06
Kaufman, Joseph A. (Department: 3754)
Dispensing
Plural sources, compartment, containers and/or spaced jacket
With discharge assistant for each source
C222S326000, C222S340000, C222S391000
Reexamination Certificate
active
06182866
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention refers to a manually operated dispensing device for cartridges, comprising a friction brake acting upon a thrust rod, said friction brake having a brake spring which frictionally acts upon the thrust rod. The latter comprises a toothing coacting with a corresponding toothing of a drive member.
The first and major task of friction brakes is to allow a relief stroke of the thrust rod after each advance stroke, said relief stroke being dictated by the relief of the flexible cartridges. That is, the friction brake should not substantially hinder the thrust rod but efficiently neutralize the trailing force being created by the drive member during grip regain and acting upon the thrust rod. Whereas the thrust rod, or the thrust rods in the case of a two-component cartridge, is guided during the advance motion by being in meshing engagement with the drive member, there is a risk during grip regain that the thrust rod is pushed somewhat offset, and the precise meshing with the teeth of the drive members is no longer guaranteed.
2. Description of the Prior Art
A dispensing device such as mentioned above has already become known from U.S. Pat. No. 4,826,053 to the same Applicant. The friction brake which has been disclosed in that document is composed of many single parts which occupy a rather great space and do not allow an alignment.
The document EP-A-0,791,404, to the same Applicant too, discloses a simplified friction brake which consists of an omega shaped spring only. It has turned out, however, that such an omega shaped spring is difficult to be adjusted to the dimensions of the thrust rod and, moreover, does not align the thrust rod.
SUMMARY OF THE INVENTION
Starting from this prior art, it is an object of the present invention to provide a manually operated dispensing device comprising a friction brake that does not exhibit the above discussed drawbacks and that contains a low-cost friction brake which efficiently holds the thrust rod in position during grip regain and which aligns moreover the thrust rod, or double thrust rod in case of two-component cartridges, in such a way that the toothing of the drive member can perfectly mesh with the toothing of the thrust rod during grip regain. These objects are attained by a manually operated dispensing device of the above depicted kind wherein both the brake spring that acts as a friction brake and also the housing of the device comprise means for lining up the toothing of the thrust rod with the toothing of the drive member. Other advantages and features will be defined in the description of embodiments below and in the dependent claims.
REFERENCES:
patent: 4452285 (1984-06-01), Liebhard et al.
patent: 4826053 (1989-05-01), Keller
patent: 4923096 (1990-05-01), Ennis, III
patent: 5248068 (1993-09-01), Goergen et al.
patent: 5400925 (1995-03-01), Simmen
patent: 5425590 (1995-06-01), Duty et al.
patent: 5653363 (1997-08-01), Chang
patent: 791 404 (1997-08-01), None
Foley & Lardner
Kaufman Joseph A.
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