Abstract: It comprises a telescopic assembly formed by a first internal body (1A) and a second external body (2A-2E), the piezoelectric assembly being housed inside and wherein is fixed a piezoelectric crystal which, when struck by the striker hammer (3) appropriately movably guided within the internal telescopic body (1A), produces the gas lighting spark. The second external telescopic body (2A-2E) is closed externally in order to avoid the incoming of foreign elements which could cause problems to the operation of the mechanism The diametral projections of the striker (3) are actuated by first (25) and second (28) ramps, as well as by longitudinal voids (32) provided in opposite walls of said external telescopic body (2A-2E), said ramps guiding the striker (3) both in the assembly process and in the triggering resetting of said striker.

Abstract: This mechanism of the invention has two telescopic assemblies (1, 2) aided by a spring (20) for maintaining a maximum extension position between the assemblies. The interior assembly (1) includes a piezoelectric element (3) which is immobilized between an anvil (4) and a limiting piece (5) over which a plexor (6) hits to generate the lighting spark. The external telescopic assembly (2) is prevented from rotation relative to the internal one (1) by an angular piece (22) having orthogonal flanks. One flank of this angular piece has a central slot forming two lugs (24), which enter respective parallel notches (23) of the internal telescopic assembly (1) when crossing its wall. The other flank contacts one of the external faces of the other telescopic assembly. The spring (20) is external and is axially distant from the piezoelectric element (3).