Quick coupling

Abstract

A control device for controlling the variation of the angle of attack of the blades of the anti-torque rotor for an aircraft capable of hovering is described, comprising a control element sliding along a first axis with respect to a shaft of the rotor and rotatable integrally therewith; the control element is operatively connected to a plurality of blades articulated on the shaft in order to vary the angle of attack thereof following a translation of the element itself along the axis; a control rod axially sliding along the axis with respect to the shaft and angularly fixed with respect to the axis; and a rolling bearing interposed between the control rod and the control element, sliding along the axis with respect to the shaft and integrally with the control rod; the control device comprises a threaded element screwed onto the control rod and cooperating with the bearing to constrain it axially with respect to the control rod and a bushing coupled in an angularly and axially fixed manner to the threaded element, and in an angularly fixed manner to the control rod.

1 . A safety device ( 1 ) for a quick coupling ( 100 ) installable at a free end (EE) of an articulated arm (B) of an operating machine (MO) and designed to stably grab an adapter ( 200 ) associated with a tool (U) and provided with two parallel axles ( 202 ′) ( 202 ″); said quick coupling ( 100 ) comprising a box-shaped frame ( 102 ) which extends in a given direction (D) and has a seat ( 1024 ) at the front developed in a direction transverse to said direction (D) for a first axle ( 202 ′) of said two axles ( 202 ′) ( 202 ″); said frame ( 102 ) having two parallel sides ( 1020 ′) ( 1020 ″) which extend in said given direction (D); at least one elongated locking member ( 104 ) delimited axially by a respective end portion ( 1040 ) being carried by a moving element ( 106 ) coupled to said frame ( 102 ) in a movable manner along said direction (D) between a neutral position (PN) in which each said elongated member ( 104 ) has the respective said end portion ( 1040 ) rearwardly distinct from a second axle ( 202 ″) of said two axles ( 202 ′) ( 202 ″) and an active position (PA) in which each said elongated member ( 104 ) has the respective said end portion ( 1040 ) in locking contact with said second axle ( 202 ″); characterised in that it comprises visual signalling means ( 10 ) which, when said first axle ( 202 ′) is housed in said seat ( 1024 ) and each said elongated member ( 104 ) is arranged in the respective said active position (PA), are adapted to visually distinguish a condition of incomplete coupling between said quick coupling ( 100 ) and said adapter ( 200 ) in which said second axle ( 202 ″) is distinct from said end portion ( 1040 ) from a condition of complete coupling between said quick coupling ( 100 ) and said adapter ( 200 ) in which said second axle ( 202 ″) is locked by said end portion ( 1040 ); said visual signalling means ( 10 ) comprising at least one signalling member ( 14 ) associated externally with a first side ( 1020 ′) of said two sides ( 1020 ′) ( 1020 ″) and arranged in position such as to be, in use, invisible exclusively in the case of complete coupling between said quick coupling ( 100 ) and said adapter ( 200 ). 
     
     
         2 . The device according to  claim 1 , characterised in that said visual signalling means ( 10 ) comprise a prismatic member ( 12 ) which extends in a direction parallel to said direction (D) and is stably coupled to said moving element ( 106 ) and has a contrasting colour relative to said frame ( 102 ); said frame ( 102 ) having a hole ( 1026 ) at the front for a head ( 120 ) of said prismatic member ( 12 ). 
     
     
         3 . The device according to  claim 2 , characterised in that said hole ( 1026 ) is obtained above said seat ( 1024 ). 
     
     
         4 . The device according to  claim 3 , characterised in that each of said sides ( 1020 ′) ( 1020 ″) has a hook ( 1022 ′) ( 1022 ″) at the front for defining said seat ( 1024 ); said frame ( 102 ) having a concave portion ( 1028 ) facing on the side opposite to said seat ( 1024 ) adapted, in use, to coact with each said elongated member ( 104 ) arranged in said active position to rearwardly delimit a “C” shaped space adapted to house said second axle ( 202 ″). 
     
     
         5 . The device according to  claim 4 , characterised in that said signalling member ( 14 ) is positioned close to said concave portion ( 1028 ). 
     
     
         6 . The device according to  claim 1 , characterised in that said signalling member ( 14 ) is delimited by a face ( 140 ) detected relative to the respective said first side ( 1020 ′) having a thickness less than or equal to a length calculated as half of the difference between a free longitudinal extension of said first and second axles ( 202 ′) ( 202 ″) and a distance between the outer surfaces ( 10200 ) of said sides ( 1020 ′) ( 1020 ″). 
     
     
         7 . A quick coupling ( 100 ) installable at a free end (EE) of an operating machine (MO) and designed to stably grab an adapter ( 200 ) associated with a tool (U) and provided with two parallel axles ( 202 ′) ( 202 ″); said quick coupling ( 100 ) comprising a box-shaped frame ( 102 ) which extends in a given direction (D) and has a seat ( 1024 ) at the front developed in a direction transverse to said direction (D) for a first axle ( 202 ′) of said two axles ( 202 ′) ( 202 ″); said frame ( 102 ) having two parallel sides ( 1020 ′) ( 1020 ″) which extend in said given direction (D); at least one elongated locking member ( 104 ) delimited axially by a respective end portion ( 1040 ) and carried by a moving element ( 106 ) coupled to said frame ( 102 ) in a movable manner along said direction (D) between a neutral position (PN) in which each said elongated member ( 104 ) has the respective said end portion ( 1040 ) rearwardly distinct from a second axle ( 202 ″) of said two axles ( 202 ′) ( 202 ″) and an active position (PA) in which each said elongated member ( 104 ) has the respective said end portion ( 1040 ) in locking contact with said second axle ( 202 ″); characterised in that it comprises visual signalling means ( 10 ) which, when said first axle ( 202 ′) is housed in said seat ( 1024 ) and each said elongated member ( 104 ) is arranged in the respective said active position (PA), are adapted to visually distinguish a condition of incomplete coupling between said quick coupling ( 100 ) and said adapter ( 200 ) wherein said second axle ( 202 ″) is distinct from said end portion ( 1040 ) from a condition of complete coupling between said quick coupling ( 100 ) and said adapter ( 200 ) wherein said second axle ( 202 ″) is locked by said end portion ( 1040 ); said visual signalling means ( 10 ) comprising at least one signalling member ( 14 ) associated externally with a first side of said two sides ( 1020 ′) ( 1020 ″) and arranged in position such as to be, in use, invisible exclusively in the case of complete coupling between said quick coupling ( 100 ) and said adapter ( 200 ). 
     
     
         8 . The quick coupling according to  claim 7 , characterised in that said visual signalling means ( 10 ) comprise a prismatic member ( 12 ) that extends in a direction parallel to said direction (D) and is stably coupled to said moving element ( 106 ) and has a contrasting colour relative to said frame ( 102 ); said frame ( 102 ) having a hole ( 1026 ) at the front for a head ( 120 ) of said prismatic member ( 12 ). 
     
     
         9 . The quick coupling according to  claim 8 , characterised in that said hole ( 1026 ) is obtained above said seat ( 1024 ). 
     
     
         10 . The quick coupling according to  claim 9 , characterised in that each of said sides ( 1020 ′) ( 1020 ″) has a hook ( 1022 ′) ( 1022 ″) at the front for defining said seat ( 1024 ); said frame ( 102 ) having a concave portion ( 1028 ) facing on the side opposite to said seat ( 1024 ) adapted, in use, to coact with each said elongated member ( 104 ) arranged in said active position to rearwardly delimit a “C” shaped space adapted to house said second axle ( 202 ″). 
     
     
         11 . The quick coupling according to  claim 10 , characterised in that said signalling member ( 14 ) is positioned close to said concave portion ( 1028 ). 
     
     
         12 . The device according to  claim 7 , characterised in that said signalling member ( 14 ) is delimited by a face ( 140 ) detected relative to the respective said first side ( 1020 ′) having a thickness less than or equal to a length calculated as half of the difference between a free longitudinal extension of said first and second axles ( 202 ′) ( 202 ″) and a distance between the outer surfaces ( 10200 ) of said sides ( 1020 ′) ( 1020 ″).