Patent ID: 6941788

Claim:
Brake ( 1 ) to form, on a flat blank or a thin sheet, sections of any angular orientation, this brake ( 1 ) comprising at least one platen ( 2 ) coacting with a press ( 3 ) to immobilize a section of the blank to be bent, the platen ( 2 ) being prolonged by a table ( 4 ) articulated to the platen ( 2 ) by means of a hinge ( 5 ) to orient angularly, by relative movement of the table ( 4 ) and of the platen ( 2 ), the immobilized angular section of the blank relative to the rest of the blank, said hinge ( 5 ) being constituted by two hinge parts belonging respectively one to the table ( 4 ), the other to the platen ( 2 ), characterized in that a female hinge portion ( 6 ), secured to the platen ( 2 ), is constituted by a cage ( 6 A) having as its transverse cross section a profile in the shape of a cylindrical sector ( 6 B) prolonged by a retaining lip ( 6 C) delimiting with said cylindrical sector ( 6 B) an opening ( 6 D) of the cage ( 6 A), said cage ( 6 A) being adapted to receive by simple sliding a male portion ( 7 ) of the hinge ( 5 ), this male portion ( 7 ) of the hinge ( 5 ) in the general shape of a conchoidal winding, having in transverse cross section a profile in the shape of a cylindrical sector ( 7 A) prolonged by a retaining lip ( 7 B) such that, in the assembled condition, the portions ( 6 , 7 ) of the hinge ( 5 ) will be held in engagement at least by their respective retaining lips ( 6 C, 7 B), the distal end of the last-named retaining lip ( 7 B) taking part in the conchoidal winding having a cross section inscribed in a circle to constitute a pivotal axis in the assembled condition of the two portions ( 6 , 7 ) of the hinge ( 5 ), this last-named retaining lip ( 7 B) of the conchoidal winding being held in bearing contact within the cage ( 6 A) against the first-named retaining lip ( 6 C) in a manner such that the cylindrical sector ( 7 A) of the conchoidal winding bears permanently against the retaining lip ( 6 C) of the cage ( 6 A) and against the cylindrical sector ( 6 B) of the cage ( 6 A), these three points of bearing being simultaneously in permanent contact no matter what the angular position of the constituent parts of the hinge.