Patent GB-283400-A (GB)
Title: Improvements in armature actuating mechanism for magnetos
IPC: H02K35/06
Filed: 1927-05-23
Abstract: 283,400. Marks, E. C. R., (Wico Electric Co.). May 23, 1927. Inductor machines; reciprocating machines,-Armature actuating mechanism for a magneto of the reciprocating armature type comprises an operating member to which the driving force is applied and which can engage with a part connected to the armature for direct drive or through resilient means with a second operating member also adapted to engage with the armature part when the first operating member is disengaged therefrom. The magneto comprises a frame A, cover 13, primary and secondary windings 14, 15, magnets 12, and a reciprocating armature and inductor 25 normally pressed against the ends of the cores 13 by means of springs 32. A casing 19 encloses the interrupter which consists of a fixed insulated contact 20, and a movable contact 22 carried by a plunger 21, the lower end of which passes through a lug 24 carried by the inductor. Forward movement of the inductor separates the interrupter contacts against the action of a spring 26. The inductor is fixed on a shaft 30 which also carries an arm 36 by means of which the inductor is moved. The drive-transmitting mechanism between the arm 36 and the drive shaft 56 consists of a pair of levers 40, 41, which may be identical in form. These levers are mounted reversely on a hub 42, Fig. 10, slidable on the shaft 30. The levers have a limited relative rotation determined by abutments 47, 48 and projections 49, 50 but no relative axial movement. A spring 51 coiled around the projections 49, 50 keep the outer ends of the levers apart. The levers co-operate with an eccentric 55 on the drive shaft 56 and the arm 36 in such a wav that in one position of the hub 42 a direct drive of the armature is obtained through the lever 40, whereas in the other position of the hub, the drive is obtained through lever 40, spring 51 and lever 41. In this second position, the armature is separated from the cores when the projection 49 on the lever 40 bears on the projection 50 of the lever 41 and the movement is completed by the expansion of the spring 51. The position of the hub 42 may be varied by means of a pivoted handle 61, having at its lower end cam surfaces engaging with a movable plate which has a depending arm riding in the groove 46 of the hub. During the upward movement of the inductor, the control breaker is arranged to close the circuit of the primary winding in order to obtain a quiet seating of the inductor the poles, and for this purpose, there is lost motion between the lug 24 and the abutment 27 on the interrupter plunger 21. In order to allow the flux to build up rapidly in the cover 13 after the inductor is seated on the poles, the interrupter is arranged to open the primary winding and subsequently to close it before the inductor leaves the poles. This is accomplished by the provision on the plunger 21 of a second abutment 28 engaged by a lever 65 mounted on a shaft 66. The shaft is oscillated at the required frequency by means of an arm 68 in connection with a cam 69 driven by gearing 74, 75 from themain drive shaft.