Perfected brake

Abstract

A safety device for a carriage slidable along a main track. The safety device includes a support that is associable with the carriage, an auxiliary track associable with a section of the main track and an auxiliary wheel that is associated with the support and rotating in contact with the auxiliary track around a first axis of rotation. The device further includes a brake provided with a rotor integral in rotation with the auxiliary wheel and activatable through the effect of the centrifugal force produced by the rotation of the auxiliary wheel.

1 . A safety device for a carriage (C) slidable along a main track (T), comprising:
 a support ( 1 ) that is associable with the carriage (C);   an auxiliary track ( 2 ) associable with a section of the main track (T);   an auxiliary wheel ( 3 ), associated with the support ( 1 ) and rotating in contact with the auxiliary track ( 2 ) around a first axis of rotation (X);   wherein   a brake ( 4 ), provided with a rotor ( 4   a , 4   b ) integral in rotation with the auxiliary wheel ( 3 ) and activatable through the effect of the centrifugal force produced by the rotation of the auxiliary wheel ( 3 ).   
     
     
         2 . The safety device according to  claim 1 , wherein the brake ( 4 ) comprises:
 a magnetic unit ( 40 ), associated with the rotor ( 4   a ) integral in rotation with the auxiliary wheel ( 3 ) and movable along a direction that is radial relative to the first axis of rotation (X) between an inactive position, in which it is at a shorter distance from the first axis of rotation (X), and an active position, in which it is at a greater distance from the first axis of rotation;   a metal plate ( 5 ), solidly constrained with the support ( 1 ) and so shaped as to face the magnetic unit ( 40 ) in the active position;   wherein the magnetic unit ( 40 ) is movable from the inactive position to the active position through the effect of the centrifugal force produced by the rotation of the auxiliary wheel ( 3 ).   
     
     
         3 . The safety device according to  claim 2 , wherein the magnetic unit ( 40 ) comprises a disc ( 41 ), integral in rotation with the auxiliary wheel ( 3 ), and two or more magnets ( 42 ), that are slidable on the disc ( 41 ) along a direction that is radial relative to the first axis of rotation (X) between an inner position, in which they are at a shorter distance from the first axis of rotation (X), and an outer position, in which they are at a greater distance from the first axis of rotation and face the metal plate ( 5 ). 
     
     
         4 . The safety device according to  claim 3 , comprising elastic means ( 43 ) interposed between the disc ( 41 ) and the magnets ( 42 ) and configured to push the magnets ( 42 ) from the outer position to the inner position. 
     
     
         5 . The safety device according to  claim 3 , wherein the magnets ( 42 ) are permanent magnets. 
     
     
         6 . The safety device according to  claim 1 , wherein the auxiliary track ( 2 ) comprises a toothed profile and the auxiliary wheel ( 3 ) comprises a toothing that is engageable with said toothed profile. 
     
     
         7 . The safety device according to  claim 1 , wherein the auxiliary track ( 2 ) comprises two or more blocks ( 21 ), which are constrainable on the main track (T) and connected together in a tiltable manner so as to follow a curved course. 
     
     
         8 . The safety device according to  claim 7 , wherein said two or more blocks ( 21 ) are connected together, at end zones, by joint means ( 22 ) that permit a relative rotation between the blocks ( 21 ) on at least one plane. 
     
     
         9 . The safety device according to  claim 1 , wherein the brake ( 4 ) comprises: a ring ( 410 ), associated with the support ( 1 ); two or more braking bodies ( 411 ), associated with the rotor ( 4   b ) integral in rotation with the auxiliary wheel ( 3 ) and movable along a direction that is radial relative to the first axis of rotation (X) between an inactive position, in which they are at a shorter distance from the first axis of rotation (X), and an active position, in which they are at a greater distance from the first axis of rotation and are in contact with the ring ( 410 ); in which the braking bodies ( 411 ) are movable from the inactive position to the active position through the effect of the centrifugal force produced by the rotation of the auxiliary wheel ( 3 ). 
     
     
         10 . A carriage (C) slidable along a main track (T), comprising:
 a frame ( 10 );   a main wheel ( 11 ), associated rotatably with the frame ( 10 ) around a main axis of rotation (Y) and which is slidable along the main track (T);   the carriage comprises a safety device according to  claim 1 , wherein the support ( 1 ) is associated with the frame ( 10 ) of the carriage (C).   
     
     
         11 . A conveying system, comprising:
 a main track (T);   a carriage (C) according to  claim 8 , which is slidable along the main track (T);   wherein the system comprises a safety device according to  claim 1 , wherein the support ( 1 ) is associated with the frame ( 10 ) of the carriage (C), and wherein the auxiliary track ( 2 ) is associated with a section of the main track (T).   
     
     
         12 . The conveying system according to  claim 11 , wherein the main track (T) comprises a cable (W), and wherein the main wheel ( 11 ) is placed in contact with the cable (W) to roll on the cable (W).