Abstract: The elastic hinge comprises a hinge element (5) fixed to the front part of a spectacle frame and a hinge element (8) integral with a rod (11) inserted in the bore (9) of a housing (10). The rod (11) is pressed to the rear of the temple by a spring (16) which presses on the one hand against a collar (17) integral with the rod (11) and on the other hand against a ring (25) having a rib (26) which engages elastically on a shoulder (27). As a result of this arrangement, the fitting of the elastic assembly in the bore (9) is substantially simplified.

Abstract: The device comprises an upper part (1) including a combustion chamber (5) preceded by an air/gas mixing device (6). The lower part comprises a liquid gas reservoir (15), said reservoir being removable together with its injector (18). When replacing the empty reservoir with a filled one, the user benefits from an injector (18) in perfectly clean condition.

Abstract: The supply conduits (1, 2) for two different gases to be mixted are each associated to a pressure regulator (3, 4) and lead into two chambers (5, 6) connected by chokes (7, 8) having a variable section area to a mixing chamber (9). A control member (13) allows the cross section area of the chokes (7, 8) to be varied without modifying the ratio between those cross section areas. Another control member (14) allows the ratio between those cross section areas to be varied without modifying the sum. This device allows a mixture of gases of any molecular weight in predetermined proportions.