System for mounting different types of bulb on the reflector of a lamp

Claim 1

A mounting system for mounting a bulb on the reflector of a lamp, in particular the parabolic reflector of a headlamp for a vehicle such as a car, an agricultural machine, an earth-moving machine, or a hoist, the mounting system being such that the bulb may be selected from a first type of bulb and a second type of bulb, with the bulb in each of these types being associated with a radial reference surface situated at a predetermined respective distance d 1 or d 2 from the midpoint of the filament of the bulb, where d 1 is not equal to d 2 ; and wherein the system comprises; a bulb-carrier fixed to the reflector and defining a radial thrust surface situated at a predetermined distance from the focus of the reflector; first adaptor means suitable for co-operating with a bulb of the first type, said first adaptor means being provided with an axial bore of a first diameter suitable for receiving the base or support of the bulb, said first adaptor means also including a first contact surface bearing against the reference surface of said first type of bulb, and a second contact surface bearing against the thrust surface of the bulb-carrier, said two contact surfaces being parallel to each other and being at a distance D 1 apart; and second adaptor means suitable for co-operating with a lamp of the second type, said second adaptor means being provided with an axial bore of a second diameter suitable for receiving the base or the support of a lamp of the second type, said second adaptor means further including a first contact surface bearing against the reference surface of said bulb of the second type, and a second contact surface bearing against the thrust surface of the bulb-carrier, said two contact surfaces being parallel to each other and being a distance D 2 apart, such that, algebraically, D 2 +d 2 =D 1 +d 1 ; whereby regardless of the type of bulb mounted on the bulb-carrier by the corresponding adaptor means and regardless of the possible type of bulb support, the bulb filament is centered on the axis of the lamp and the axial position of the filament relative to the focus of the reflector is the same.