Anti-theft device for aircraft

An anti-theft device for attachment to an aircraft propeller blade having mounted and free ends relative to said aircraft and leading and trailing edges diverging relative to one another in the direction from said mounted end toward said free end, said device comprising a collar for extending about said blade and interengaging with said diverging leading and trailing edges at a location spaced from said mounted end to preclude displacement of said collar relative to said blade in the direction from said location toward said free end, said leading and trailing edges of said blade having a major dimension therebetween at a location between said mounted and free ends, said collar comprising first and second collar members having spaced apart opposed surfaces for engaging said leading and trailing edges, said first and second collar members interengaging for linear sliding displacement relative to one another between first and second positions, said opposed surfaces in said first and second positions respectively being spaced apart a distance less and a distance greater than said major dimension, said first collar member including parallel arms and a first V-shaped bight therebetween, said second collar member including parallel tubular legs slidably receiving said arms, said legs having a second V-shaped therebetween, said first and second bights providing said opposed surfaces, and a lock for releasably holding said arms and said legs in said first position of said collar members.

An anti-theft device for attachment to an aircraft propeller blade having mounted and free ends relative to said aircraft and leading and trailing edges diverging relative to one another in the direction from said mounted end toward said free end, said device comprising a collar for extending about said blade and interengaging with said diverging leading and trailing edges at a location spaced from said mounted end to preclude displacement of said collar relative to said blade in the direction from said location toward said free end, said leading and trailing edges of said blade having a major dimension therebetween at a location between said mounted and free ends, said collar comprising first and second collar members having spaced apart opposed surfaces for engaging said leading and trailing edges, said first and second collar members interengaging for linear sliding displacement relative to one another between first and second positions, said opposed surfaces in said first and second positions respectively being spaced apart a distance less and a distance greater than said major dimension, said first collar member including parallel arms and a first bight therebetween, said second collar member including parallel tubular legs slidably receiving said arms, said legs having a second bight therebetween, said first and second bights providing said opposed surfaces, a lock for releasably holding said arms and said legs in said first position of said collar members, each said first and second bight being one of a U-shaped bight and a V-shaped bight, one of said arms and the one of said legs slidably receiving said one arm including interengaging means for stopping slidable displacement between said legs and arms in the direction of separation thereof, and said interengaging means including a slot in said one arm and a projection on said one leg received in said slot.

An anti-theft device for attachment to an aircraft propeller blade having mounted and free ends relative to said aircraft and leading and trailing edges diverging relative to one another in the direction from said mounted end toward said free end, said device comprising a collar for extending about said blade and interengaging with said diverging leading and trailing edges at a location spaced from said mounted end to preclude displacement of said collar relative to said blade in the direction from said location toward said free end, said leading and trailing edges of said blade having a major dimension therebetween at a location between said mounted and free ends, said collar comprising first and second collar members having spaced apart opposed surfaces for engaging said leading and trailing edges, said first and second collar members interengaging for linear sliding displacement relative to one another between first and second positions, said opposed surfaces in said first and second positions respectively being spaced apart a distance less and a distance greater than said major dimension, said first collar member including parallel arms and a first bight therebetween, said second collar member including parallel tubular legs slidably receiving said arms, said legs having a second bight therebetween, said first and second bights providing said opposed surfaces, a lock for releasably holding said arms and said legs in said first position of said collar members, each said first and second bight being one of a U-shaped bight and a V-shaped bight, one of said arms and the one of said legs slidably receiving said one arm including interengaging means for stopping slidable displacement between said legs and arms in the direction of separation thereof, and said interengaging means including means on said one arm providing a radially outwardly extending abutment, and means on said one leg providing a radially inwardly extending shoulder in the path of said abutment.