Bar barrier with bar weight offset system

Abstract

A motorized bar barrier device, including a shaft ( 14 ) supporting the bar, a motor unit ( 12 ) for the rotation of the shaft and a unit ( 13 ) for offsetting the moment produced on the shaft by the weight of the bar. The offsetting unit ( 13 ) comprises a torsion spring ( 24 ) wrapped coaxially at the shaft and which has a first end ( 27 ) that is pushed by the rotation of the shaft to wind the spring when the shaft ( 14 ) is turned in a first direction starting from a neutral position and a second end ( 28 ) that is pushed by the rotation of the shaft to wind the spring when the shaft ( 14 ) is turned in a second opposite direction starting from the neutral position. This way, the system can provide offsetting of the moment produced by the weight of the bar in both the directions of rotation starting from the neutral position.

1 . Motorized bar barrier device, comprising a shaft ( 14 ) supporting the bar, a motor unit ( 12 ) for turning the shaft and a unit ( 13 ) for offsetting the moment produced on the shaft by the weight of the bar, wherein the offset unit ( 13 ) comprises a torsion spring ( 24 ) wrapped coaxially at the shaft and which has a first end ( 27 ) that is pushed by the rotation of the shaft to wind the spring when the shaft ( 14 ) is turned in a first direction starting from a neutral position and a second end ( 28 ) that is pushed by the rotation of the shaft to wind the spring when the shaft ( 14 ) is turned in a second opposite direction starting from the neutral position, so as to be able to provide at least partial offsetting of the moment produced by the weight of the bar in both directions of rotation starting from the neutral position. 
   
   
       2 . Device as defined by  claim 1 , wherein the shaft ( 14 ), by means of the alternate thrust of the two ends ( 27 ,  28 ) of the spring, supports a thrust pin ( 26 ) which is parallel to it and at a radial distance such as to be in between the two ends of the spring, protruding radially to push on the pin ( 26 ) from opposite directions, single-directional stop means ( 29 ,  30 ) also being present to prevent the movement of each respective end ( 27 ,  28 ) of the spring in the direction opposite to that of winding during the thrust movement of the pin ( 26 ) on the other end. 
   
   
       3 . Device as defined by  claim 1 , wherein the torsion spring ( 24 ) has been selected to have a moment generated by the spring with pattern substantially similar and directly proportionate to the opposite one generated by the weight of the bar. 
   
   
       4 . Device as defined by  claim 2 , wherein the single-directional stop means consist of the end part of two cracks ( 29 ,  30 ) made in a cover shell of the spring, through which pass the ends ( 27 ,  28 ) of the spring. 
   
   
       5 . Device as defined by  claim 1 , wherein mechanical stop means ( 31 ,  32 ,  33 ) are envisaged to limit the rotation movement of the shaft between a position with vertical bar and a position with horizontal bar. 
   
   
       6 . Device as defined by  claim 5 , wherein the mechanical stop means are adjustable to have, alternatively, the position with horizontal bar in clockwise direction or in anticlockwise direction with respect to the vertical position. 
   
   
       7 . Device as defined by  claim 6 , wherein the stop means comprise a first vertical position stop ( 31 ) and at least one second horizontal position stop ( 32 ) with which interferes an arm ( 25 ) protruding radially from the shaft ( 14 ). 
   
   
       8 . Device as defined by  claim 7 , wherein the vertical position stop ( 31 ) is made in the shape of a reversible plate to be mountable to prevent a further movement, alternatively anticlockwise or clockwise, of the arm ( 25 ) protruding from the shaft ( 14 ). 
   
   
       9 . Device as claimed by  claim 7 , wherein the shaft ( 14 ), by means of the alternate thrust of the two ends ( 27 ,  28 ) of the spring, supports a thrust pin ( 26 ) which is parallel to it and at a radial distance such as to be in between the two ends of the spring, protruding radially to push on the pin ( 26 ) from opposite directions, single-directional stop means ( 29 ,  30 ) also being present to prevent the movement of each respective end ( 27 ,  28 ) of the spring in the direction opposite to that of winding during the thrust movement of the pin ( 26 ) on the other end, and wherein the arm ( 25 ) also acts as a support to the thrust pin ( 26 ) on the shaft ( 14 ). 
   
   
       10 . Device as defined by  claim 1 , wherein the motor unit is kinematically connected to the shaft ( 14 ) in a disengageable way by means of a release system ( 22 ,  23 ). 
   
   
       11 . Device as defined by  claim 10 , wherein the release system comprises in combination a gear ( 19 ) freely turnable on the shaft ( 14 ) and to which is connected a pinion ( 20 ) of a gearmotor ( 21 ) of the motor unit ( 12 ), releasable engagement means ( 35 ,  39 ) between the shaft and gear and a lever ( 23 ) for manually operating such releasable means between an engaging position and a disengaging position. 
   
   
       12 . Device as defined by  claim 11 , wherein the lever ( 23 ) is positioned on a plate ( 15 ) supporting the bar on the shaft ( 14 ). 
   
   
       13 . Device as defined by  claim 11 , wherein the releasable means comprise an elongated element ( 35 ) which transversally crosses the shaft ( 14 ) at an elongated slot ( 36 ) for axial sliding on the shaft between an engaging position in a radial seat ( 38 ) in a bush ( 39 ) integral with the gear ( 19 ) and a disengaging position from such seat ( 38 ), the lever being kinematically connected to the elongated element ( 35 ) to cause its movement, against the action of a spring ( 37 ), from the engaging position to the disengaging position. 
   
   
       14 . Device as defined by  claim 13 , wherein the lever ( 23 ) is kinematically connected to the elongated element ( 35 ) by means of an operating pin ( 40 ) that slides axially in the shaft ( 14 ). 
   
   
       15 . Device as defined by  claim 13 , wherein the bush ( 39 ) comprises a plurality of angularly distanced radial seats ( 38 ). 
   
   
       16 . Device as defined by  claim 1 , wherein are comprised support means ( 41 ,  42 ) for wall fastening.