Pyrotechnic device

Abstract

Parachutes for signalling rockets, for example, open in a jerky manner, as a result of which the suspension lines ( 13 ) are exposed to a heavy load. The invention envisages two suspension lines ( 14 ) configured in an extensible, particularly rubber-band-like manner, as a result of which the initially effective parachute surface area is reduced, which causes the parachute canopy ( 12 ) of the parachute ( 10 ) to open more slowly than with previous parachutes ( 10 ), which in turn reduces the opening jerk of the parachute ( 10 ). In this way, the suspension lines ( 13, 14 ) in particular, but also the parachute canopy ( 12 ) of the parachute ( 10 ), are subject to less load.

What is claimed is: 
     
         1 . A pyrotechnic device having a rocket or a projectile, a parachute ( 10 ;  25 ;  31 ) with parachute lines and at least one signalling, illumination and/or observational means assigned to the parachute ( 10 ;  25 ;  31 ), wherein the at least one parachute line is more extensible than at least one other parachute line. 
     
     
         2 . The pyrotechnic device according to  claim 1 , wherein the extensibility of each extensible or more extensible parachute line is at least twice as great as the extensibility of the at least one, preferably all, other parachute lines and/or each extensible or more extensible parachute line is extensible by at least 30% of its starting length. 
     
     
         3 . The pyrotechnic device according to  claim 1 , wherein the at least one other parachute line is not or at least scarcely extensible during deployment of the parachute ( 10 ;  25 ;  31 ). 
     
     
         4 . The pyrotechnic device according to  claim 1 , wherein the or each extensible or more extensible parachute line is extensible at least to such an extent that its length can be increased by the diameter, the greatest width or the diagonal of an outline surface area of the parachute ( 10 ;  25 ;  31 ), particularly of a top surface ( 16 ) or a cut piece of a parachute canopy ( 12 ;  26 ;  32 ). 
     
     
         5 . The pyrotechnic device according to  claim 1 , wherein one or at least two adjacent parachute lines exhibit a greater extensibility than the other parachute lines. 
     
     
         6 . The pyrotechnic device according to  claim 1 , wherein the extension of all parachute lines, in particular the extension of the extensible or more extensible parachute lines, falls in the elastic range. 
     
     
         7 . The pyrotechnic device according to  claim 1 , wherein the elasticity of each extensible or more extensible parachute line is the same, the elasticity of the or of each extensible or more extensible parachute line is preferably such that when the parachute ( 10 ;  25 ;  31 ) or the parachute canopy ( 12 ;  26 ;  32 ) is completely opened, all parachute lines are at least the same length. 
     
     
         8 . The pyrotechnic device according to  claim 1 , wherein the at least one extensible or more extensible parachute line is formed from at least one rubber-band-like strand, in particular a rubber band, and the at least one inextensible or less extensible parachute line is formed from a rope, preferably a braided or woven rope. 
     
     
         9 . The pyrotechnic device according to  claim 4 , wherein the top surface ( 16 ) or the cut piece of the parachute canopy ( 12 ;  26 ;  32 ) has a preferably round or polygonal outline surface area, a periphery ( 17 ) of the top surface ( 16 ) is preferably surrounded by a collar ( 19 ), wherein a free lower periphery of the collar ( 19 ) exhibits tails ( 22 ) and one end of a parachute line is fastened to a tip ( 23 ) of each tail ( 22 ), the extensible or more extensible parachute lines are preferably fastened to the tips ( 23 ) of two adjacent tails ( 22 ). 
     
     
         10 . The pyrotechnic device according to  claim 1 , characterized in that the parachute lines are suspension lines ( 13 ;  14 ;  28 ;  29 ;  34 ;  35 ). 
     
     
         11 . The pyrotechnic device according to  claim 10 , wherein lower ends of the suspension lines ( 13 ,  14 ) opposite the ends of all suspension lines ( 13 ,  14 ) fastened to the tips ( 23 ) of the tails ( 22 ) of the collar ( 19 ) of the parachute canopy ( 12 ) are brought together at a connection point ( 24 ) and the signalling, illumination and/or observational means or an upper end of a further parachute line carrying the signalling, illumination and/or observational means, preferably a tethering line ( 15 ), is fastened to the connection point ( 24 ), wherein the additional parachute line or the tethering line ( 15 ) in particular is extensible, particularly elastically extensible.