Combustion – Electrical or mechanical igniter correlated with burner feed – Having electric current producer
Patent
1997-11-05
1999-07-27
Dority, Carroll B.
Combustion
Electrical or mechanical igniter correlated with burner feed
Having electric current producer
310339, 361260, F23Q 712
Patent
active
059279621
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
The present invention, as expressed in the title of this specification, consists of a piezoelectric mechanism for gas lighters, offering notable advantageous characteristics versus conventional ones.
The piezoelectric mechanisms used for the production of the lighting spark, is basically made up of a pair of telescopic bodies which are to be found mutually assisted by a spring which keeps them in the maximum extended position, being equipped with means which limit the total accidental separation. Solidly attached to one of these bodies are indistinctly located the crystal or piezoelectric element which provides the lighting spark when the striker hammer makes impact on the same. The piezoelectric element is in turn found located between a metallic part named "anvil" and another part which is the one which in reality receives the impact of the striker hammer, called "base" or "stop part".
The main object of the invention is constituted by the presentation of an improved shape in the structure of the exterior telescopic body to achieve prevention of the ingress of dust and foreign bodies into the inside of the telescopic assembly in which the actuation mechanisms are enclosed.
BACKGROUND OF THE INVENTION
As is known, in the conventional structure of these pizoelectric mechanisms, the striker hammer plays on the axial hollow of the interior telescopic body, and in the rest position it is found spaced from the piezoelectric element, due to the existence of retention means, will be described hereinafter.
When a manual compression force Is exerted on the telescopic assembly to cause the lighting, which is accomplished by overcoming the action of the spring which assists the telescopic assembly, the compression of a second spring simultaneously takes place, which shall subsequently activate the striker hammer at the moment of release, thus creating the impact energy of the hammer.
The guiding means of the striker hammer are defined by a pair of confronted longitudinal grooves, which run through the wall of one of the tubular bodies, the grooves housing two diametrical projections of the striker hammer.
In the condition of rest of the mechanism, the striker hammer is found retained by its transversal projections, in two notches, each open at a side of the respective longitudinal groove of said tubular body, being inserted in the notches when the striker hammer is forced to effect a rotational movement. In order that the striker hammer performs a small rotation, both for exiting from the retention notches and for entering the same after the impact, to originate the rearming of the mechanisms, at the end of the compression run of the telescopic assembly, and during the distension of the same, respectively, the diametrical projections of the striker hammer are pressed by the ramp edges of two windows provided on the other telescopic body, where said projections also play.
In the U.S. Pat. No. 5,262,697, a mechanism is described of the previously defined type, by means of which a perfect guiding of both telescopic bodies is achieved, having said bodies a totally symmetrical geometry of easy construction, in which the guiding means is external to the position of maximum separation of the telescopic assembly recovery spring and of the spring which activates the striker hammer, which is additionally totally guided throughout its travel.
The mechanism of this Patent, U.S. Pat. No. 5,262,697, achieves the elimination of the induction effects created at the moment when the spark is produced, having been provided that the exterior spring occupies a position which is axially spaced from the piezoelectric element. Likewise, the path of the electric circuit is shortened, with the intervention of the least number of elements possible and it being possible to use nonconductive plastic and to reduce the production costs, as well as achieving a perfect mixing of the gas with the air, prior to the moment when the gas lighting spark is produced, optimizing the combustion. Additionally, the mechanism of doc
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Amoros Nollas Enrique
Meury Marcel
Dority Carroll B.
LaForest Bic, S.A.
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