Patent ID: 7692421

Claim:
A control meter for controlling the supply of services, in particular the supply of electric energy, the control meter comprising: a support base ( 1 ), anchored with which is a main power supply line; and a metering group ( 2 ) detachable from the support base ( 1 ) and comprising a measurement apparatus interposed between the main power supply line ( 20 ) and a subscriber line ( 50 ); and wherein the metering group ( 2 ) is mountable on the support base ( 1 ) by means of a bayonet-type attachment system, including a pair of hook-like members ( 2 b , 2 c ) integral with one of the support base ( 1 ) and the bottom wall ( 2 a ) of the body ( 2 ) of the meter, and, two recessed members ( 1 a , 1 b ) formed in the other one of the support base ( 1 ) and the bottom wall ( 2 a ) of the body ( 2 ) of the meter, facing the hook-like members, whereby the engagement of the hook-like teeth in the recessed members takes place due to a displacement of the body ( 2 ) of the control meter parallel to the support base; a safety anchorage comprising mechanical means ( 6 , 7 , 8 , 9 , 10 ) associated with the metering group ( 2 ) and movable into a locking position for engagement with the support base ( 1 ) when the metering group is mounted on the support base ( 1 ); and an interrupter ( 11 , 11 a , 11 b ) for generating an activation signal upon activation by the mechanical means; wherein the mechanical means ( 6 , 7 , 8 , 9 , 10 ) is arranged to form a locking bar against a parallel movement of the metering group relative to the support base and to activate the interrupter( 11 , 11 a , 11 b )when the mechanical means is released from the locking position for detaching the metering group from the support base.