ELEKTROMECHANISCHE GETRIEBE-MOTOREINHEIT FUER TUEROEFFNUNGSVORRICHTUNGEN UND AEHNLICHES.

摘要

A geared motor unit (1) for door opening devices and the like comprises a worm screw (3) and helical wheel (5) assembly carrying a shaft (9) substantially orthogonal to the plane of the helical wheel (5), and a second reduction assembly made up by two pairs of cylindrical gear wheels (17, 19, 21, 23) meshing together, from which assembly protrudes the shaft (25) carrying the actuating arms for the door to be rotated. Such geared motor unit (1) is equipped with an emergency device adapted to disengage the worm screw (3) and helical wheel (5) assembly from the assembly of the gear wheels (1723) and to allow for the rotation by hand of said assembly which would be otherwise impossible due to the irreversible coupling of the worm screw (3) and helical wheel (5) assembly; said device consisting of a flat grooved plate (35) engaging (at 37) with resilient means (43) the lower face (29) of the helical wheel (5), which plate is fixed (at 47) to the shaft (9) which in turn is carried idle on the helical wheel (5). In an emergency situation it is only necessary to actuate a foreseen hand grip (57) provided with a fork (51) at the top of said shaft (9), which causes the lowering of said shaft (9) coaxial to the helical wheel (5) and the consequent lowering of the flat plate (35) integer with it. The geared motor unit (1) of the invention provides for a d.c. electric circuit comprising a d.c. motor (7), a control relay (71), control pushbuttons (73) and an emergency relay (77) connected to an electronic circuit (81) provided with pressure sensors (85), a thermal stabilizer (87), a dynamic compensator (89), a signal amplifier (91), Schmidt triggers (93, 95) and a combinational logic circuit (97) adapted to analyze the signals from said circuit and to forward them to the anticrushing control circuit (99) with associated inhibit relay (79).