Patent GB-190816848-A (GB)
Title: Improvements in, or relating to, Magneto-machines for use in connection with the Ignition Systems of Internal Combustion Engines
Inventor: HALL ROBERT FREDERICK
Filed: 1908-07-20
Granted: 1908-12-17
Abstract: 16,848. Hall, R. F. July 20. Gas and like engines, igniting in. A magneto machine for ignition purposes in a dual system in which both magneto and accumulators are employed, has an armature mounted in ball bearings and carrying both the primary and secondary coils which are lead off from the same end of the armature and connected respectively to the low-tension circuit-breaker and the high-tension collector ring mounted upon a hollow part of the armature shaft, both contained in a casing isolated from the armature and from the armature driving - gear. The distributor ;is supported on ball bearings and is driven by gearing from the armature shaft at the end remote from the contact-breaker, and a metal-based condenser is detachably secured to the armature casing. The enclosed armature a is supported on ball bearings to facilitate the arrangement of the electrical connexions and to prevent the armature from sagging. A double set of bearings c', c<2> support the drive end of the detachable gear-box c which contains the gear for driving the distributor shaft. The bearings c<4> at the other end run between the shaft and a bearing-cup c<5> carried by a casing d which constitutes one of the ends of the armature casing. A partition d' serves to isolate the armature and its bearings from both the high-tension collecting devices and the low-tension contact-breaker, which are enclosed in a separate chamber d<2>. The opposite ends of the armature are provided with oil-throwing rings a<3>. The high-tension slip-ringf and the spring - pressed collector brush f<1> are arranged between the contact-breaker e and the armature. In order to connect the armature secondary to the slip-ring, the hollow spindle is fitted with a hollow plug of vulcanite g carrying a metallic contact g<2> connected to the secondary winding. Upon a further extended part of the hollow spindle is mounted a second insulating block h with a sleeve h<2> serving as an insulating carrier for a spring brush h', which makes contact with the terminal g<2> and connects it to the slip-ring f mounted upon the block. To facilitate the mounting of the brush and slip-ring, two slots h<3>, h<4>, Fig. 5, may be machined along the hollow spindle, and the carrier itself may be slotted to correspond with the solid portions h<7>, h<8> of the spindle, so that the carrier may slide upon the spindle. The slots h<3>, h<4> are made of different widths so that the carrier can only be put on one way. The primary winding is led out to a plate k<1> upon the front of the carrier h, from which the current is collected by the brush k electrically connected to the circuit-breaker e. The brush k is carried by an arm e' mounted upon the inner face of the rocking contact-breaker case e<1> so that it moves with it when the ignition advance and retard mechanism is actuated. The arm carries a platinumtipped screw m' for adjusting the distance between the contact-points of the contact-breaker. The case e' which encloses the contact-breaker has a gap n normally covered by a cap o which may be rotated to expose the contact-breaker. The cap is held by the spring p which also serves as a connexion between the contact - breaker and the condenser, which is detachably mounted on the top of the armature casing and secured in position by a peg on the body of the machine and by a retaining spring t<2> which engages the metallic earthed box of the condenser.