Valves and valve actuation – Reciprocating valve – Push or pull operator
Reexamination Certificate
2000-02-03
2001-11-27
Shaver, Kevin (Department: 3754)
Valves and valve actuation
Reciprocating valve
Push or pull operator
C137S625370
Reexamination Certificate
active
06322052
ABSTRACT:
The present invention relates to a ventilation valve, particularly for ventilating a mold for producing umbrella-type insulators.
In the production of umbrella-type insulators, which consist of a core constructed as a solid or hollow body and several umbrellas which are molded to it and have downward extending collars provided thereon and connected with the core, the essentially funnel-shaped mold is filled with an elastomer, preferably made of silicone. The solidified body is then removed from the mold (German Patent Document DE-A-2618653). In the process, a vacuum is initially formed between the mold and the umbrella which first deforms the umbrella until air can flow into the mold at one point. During the removal from the mold, tensions and even cracks occur in the umbrella which make the umbrella unsuitable for a use as an insulator.
It is an object of the present invention to avoid the damaging deformation of molded bodies of any type during the removal from the mold by using a new type of ventilation valve.
This object is achieved by providing a ventilation valve with rod-type or pin-shaped valve housing on whose front face a valve orifice is provided and on whose back face a valve body is detachably and exchangeably mounted in an axial extension of the valve housing. The valve body has a bore which extends coaxially to an axially extending cylindrical valve space provided in the valve housing. A connecting rod is guided in the bore of the valve body which extends through the valve space to the valve orifice. A valve piston is provided at the end of the connecting rod which has a seal by which the valve orifice can be tightly closed. A pressure spring clamped in between a pressure surface of the valve body and the back side of the valve piston or a stop flange is arranged on the connecting rod and situated in the area of the valve space. The valve housing has an air inlet opening which extends into the valve space.
The ventilation valve according to the invention can be cleaned in a fast and simple manner because the valve body can easily be demounted from the valve housing and can therefore be cleaned outside a mold or the like. The ventilation valve according to the invention can also be used for other ventilation measures, particularly for other removal processes from a mold, in the case of which a vacuum will or may form.
REFERENCES:
patent: 1370483 (1921-03-01), Powell
patent: 2360603 (1944-10-01), Ward
patent: 3200839 (1965-08-01), Gallagher
patent: 3448765 (1969-06-01), McKinney
patent: 3807689 (1974-04-01), Booth
patent: 4372907 (1983-02-01), Herold et al.
patent: 4690630 (1987-09-01), Patrick et al.
patent: 4770225 (1988-09-01), Takagi et al.
patent: 5648132 (1997-07-01), Shigehiko et al.
Jeuthner Hermann
Leicht Alfons
Welz Johann Georg
Barnes & Thornburg
Keasel Eric
Shaver Kevin
Trench Germany GmbH
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