Reivindicaciones

CLAIMS 1. Section insulator with neutral section for rigid catenary which enables the interruption of the electrical continuity between two adjacent sections of the catenary on the passage of the pantograph that comprises two conductor rail segments (2) which can be coupled to the conductor rail of the catenary by connection flanges, consisting of a profile whose lower end configures a housing; a central shoe (1) disposed between said segments (2); two spark wires (9) wherein the electric field is broken connected to the central shoe (1) by a system which enables their height to be adjusted; and means which allows the central shoe (1) to be bridged, thus adjusting the operation of the insulator as section insulator or as neutral section insulator, characterised in that the central shoe (1) comprises a horizontal base (5) which rests on the upper part of the two segments (2) giving continuation to the catenary and a vertical core (6) oblique to the direction of the catenary, said base (5) incorporating a series of clamps (7) for the fixing of an insulator wire (3); and in that the two spark wires (9) extend from the housing of the conductor rail segments (2) wherein they are inserted to the base (5) of the central shoe (1), wherein the distance between said two spark wires (9) is greater than the width of the pantograph table to allow the central shoe (1) to behave as a neutral section during the passage of said pantograph. 2. Insulator according to the preceding claim, characterized in that the bridging means consists of at least one connecting strip (8) disposed on the core (6) of the central shoe (1) which allows the fixing of a bridging cable which extends from said strip (8), either to a bore (10) made in one of the conductor rail segments (2), or to a connection clamp positioned on the upper part of the profile of adjacent rigid catenary. 3. Insulator according to any of the preceding claims, characterized in that each spark wire (9) is joined to the corresponding conductor rail segment (2) through an opening mechanism which comprises: two side pieces (11) adaptable to the outer surface of said segment (2); two inner pieces (12) which can be coupled to the inner surface of said segment (2) and which are installed opposite the side pieces (11); two through-bolts (13) which, bolted to the side pieces (11), maintain the opening mechanism joined; a central non-through bolt (14) bolted on one of the side pieces (11) and which abuts against one of the inner pieces (12), so that its tightening causes the opening of the housing of the conductor rail segment (2) and allows the replacement of the spark wire (9); and a series of washers (15) which, when interposed between the head of central bolt (14) and the side piece (11) wherein it is bolted, prevent the tightening of said bolt and, therefore, the opening of the housing. 4. Insulator according to any of the preceding claims characterized in that the spark height adjustment system (9) comprises: a bolt (16) whose stem traverses the base (5) of the insulating piece and is introduced in the upper end of the sparks (9); a washer (18) interposed between the head of said bolt (16) and the upper surface of the base (5); and two hold-down nuts (17) threaded on the stem of the bolt (16) and which remain opposite, via different elastic washers (19), the lower surface of the base (5) and the upper section of the spark wire (9) respectively.