Hinge having an embedded safety switch
A safety hinge, apt to constrain a door moving with respect to a fixed frame, of the type consisting of two main wing-shaped constituent members displaying a mutual-engagement area consisting of loops interconnected by a small shaft, with a first one of the wings a switch body being associated, which has a lateral opening in correspondence of an appendix thereof, arranged on the extension of the mutual-engagement area, through the opening peg for the actuation of the switch projecting. Within the appendix a bush is arranged, constrained to the by a second one of the wings, the bush displaying along an annular external crown thereof a groove for the housing of the peg in the closing position of the moving door on the fixed frame, that is in the opening position of the switch.
1. Safety hinge, apt to constrain a door moving with respect to a fixed frame, of the type consisting of two main wing-shaped constituent members ( 1 , 2 ) having a mutual-engagement area ( 3 ) consisting of loops ( 1 a , 2 a ) interconnected by means of a small shaft ( 4 ), with a first one of said wings ( 1 ) a switch body ( 7 ) and a top loop ( 1 b ) apt to the extension of the mutual-engagement area ( 3 ) being associated and connected to said switch body ( 7 ) by a channel ( 10 ), said switch body ( 7 ) housing a microswitch ( 11 ) which has an appendix ( 11 a ) housed in said channel ( 10 ) on the top of which peg ( 12 ) for the actuation of the switch project, wherein within said top loop ( 1 b ) a bush ( 13 ) is arranged, constrained to the movement by a second one ( 2 ) of said wings, said bush ( 13 ) having, along an outer annular crown ( 13 b ) thereof, a groove ( 13 c ) for the housing of said peg ( 12 ) in the home position of said microswitch ( 11 ),
wherein the movement of said bush ( 13 ) is constrained to that of the moving door by the keying-on engagement between a knurled portion ( 13 a ) of said bush ( 13 ), axially projecting from said appendix ( 11 a ) towards an opposite loop ( 2 a ) of said second wing ( 2 ), and grooves ( 14 ) obtained within said loop ( 2 a ) of said second wing ( 2 ).
2. Hinge as claimed in claim 1 ), wherein in any opening position of said door moving with respect to said fixed frame, said peg ( 12 ) rest on the outer surface of said annular crown ( 13 b ).
3. Hinge as claimed in claim 1 ), wherein said groove ( 13 c ) of said bush ( 13 ) is engaged at the desired angle with respect to the engagement area with said peg ( 12 ).
4. Hinge as claimed in claim 1 ), wherein with said bush ( 13 ) said small shaft ( 4 ) engages in rotation, axially fastened by dap joint means cooperating with an annular groove ( 6 ) arranged at one end of said small shaft ( 4 ).
5. Hinge as claimed in claim 1 ), wherein said switch body ( 7 ) is in the shape of a rectangular parallelepiped box which has on the top thereof and on the rear wall thereof collar-shaped guiding cut-outs ( 8 , 9 ) for a power supply connector to go through.
6. Hinge as claimed in claim 1 , wherein said switch body ( 7 ) is fastened on the upper edge of a wing ( 1 ), which it follows the contour of, so as to allow the 180° rotation of a wing ( 2 ) with respect to the other ( 1 ), until mutual contact between the two wings.
7. Hinge as claimed in claim 1 ), wherein said switch body ( 7 ) is made integrally with said wing ( 2 ).
8. Hinge as claimed in claim 1 ), wherein said switch body ( 7 ) is ultrasound-welded to said wing ( 2 ).
9. Hinge as claimed in claim 1 ), wherein said hinge is made of technopolymer.