Patent GB-191501950-A (GB)
Title: Improvements in Switches for use in Ignition Systems for Internal Combustion Engines.
Inventor: SWYERS BRICE PHANDERS
Filed: 1915-02-06
Abstract: 1950. Swyers, B. P. Feb. 6. Switches, secret combination and quick-break. -A switch for controlling a dual ignition system for internal-combustion engines, so that unauthorized starting of the engine is prevented, and which provides an earthing connexion for the magneto while the battery is in use, consists of an indicating-dial in the form of a clock face and two controlling-handles. The earthing is effected by a spring coacting with fixed contacts in such a manner that the earthing circuit when established by rotation of the spring in one direction remains so for a continuous movement of the control handle in the same direction, and there is also a considerable movement of the handle possible when in the disestablished condition, disengagement of the spring and contact being effected by a reverse movement of the control handle at a definite position. A fibre disk 3, Fig. 2, carries contact rings 22, 24, 25, Fig. 11, on its upper face, and contact rings 43, 44 on its under face. An arm 9, attached to the bevel-wheel 12, carries a contact which bridges the rings 24, 25 and an independent contact wiping over the ring 22 which is earthed by a lead 107. The arm is turned by a control handle 21, and its position is indicated by the long clock-hand 8. A bridging - contact for the rings 43, 44 is carried by an arm 38, this arm being turned from the control handle 64 through suitable gearing, its position being indicated by the small clock-hand 8<a> attached to a central spindle 1. The rings 22, 25, 44 are discontinuous and contact studs 26, 47 are placed in the gaps in the rings 25, 44. A disk 4, Figs. 2 and 6, attached to the central spindle 1 and turning with the arm 38 has on its under surface a deep annular recess 65, a circular recess 66, and a cut-out segment 67. A spring 68 surrounding the central spindle has extensions 69 which normally lie against the faces 70 of the segment and further extensions 71 placed in the recess 65 and always in contact with each other. A plate 73 is placed over the extensions 71, which have rounded projections 72, 72<1> at their junction with the extensions 69. These projections and plate 73 coact with the three stops 75, 76, 77 carried by a bottom plate 5; the stops 75, 76 are connected together and to earth, and the stop 77 is connected to the magneto primary. When it is desired to start on the a switch 88 is closed, and the arms 9, 38 are moved by the handles 21, 64 to connect the studs 26, 47 to the rings 24, 47. The battery is then in circuit with the induction coil 97 and with the interrupter 93 of the magneto. The secondary of the induction coil is connected to the magneto distributor 96. During this period, the plate 73 rests on the stop 77 and the magneto is earthed, the projection 72 bearing on the stop 75. If the spring is now turned in a clockwise direction by the control handle, the stop will hold the projection until the extensions 69 lie against each other. The pressure on the projection 72 will then force it over the stop 75 and further movement of the control handle will bring the projection against the stop 77. A similar snap action will occur at this stop and, unless the spring is turned back after the projection has snapped over the stop 77, the magneto will be continuously earthed. To use the magneto, the backward movement of the spring has to be made at a definite position of the control handles, so that the stop 77 lies between the two extensions 69. A bell 103 gives a signal when the parts are wrongly used.