Bombardier-rotax Gesellschaft Mbh

Alfred Obermayer

A pullback starter comprises a rope pulley rotatably mounted on an axle and on which a driving coupling element is mounted for pivotal movements to constitute an engageable and disengageable coupling of a clutch for the drive shaft of an internal combustion engine. A coil spring surrounds the axle and is braked against rotation thereon by friction. The spring has first and second legs protruding from the axle at opposite ends of the spring. A locking member engaged by the first leg is rotatably mounted in the coupling element for rotation relative thereto between locking and unlocking positions. A first stop is carried by the coupling element, second and third stops are carried by the locking member, the second stop being arranged so that, when the locking member is in its unlocking position, the second stop engages the first stop, and the third stop being arranged so that, when the locking member is in its locking position, it prevents pivotal movement of the coupling element, a further stop is carried by the coupling element and is adapted to engage the second leg so as to define the locking position, and a safety stop is carried by the first leg and engages the second leg to act on the latter in a sense tending to untwist the spring.

Pullback starter for internal combustion engines

A rope drum is rotatably mounted on an axle, which is fixed in a frame. A rope is wound on said drum and adapted to be pulled from said drum so as to rotate the latter in a predetermined sense. A pullback spring tends to rotate said drum opposite to said predetermined sense. A one-way coupling element is pivoted to said drum on a pivotal axis that is parallel to the axis of said axle. The coupling element carries a first stop and is pivotally movable about said pivotal axis from an inner position to an outer position for one-way coupling engagement with a clutch member on an input shaft of an internal combustion engine, and back to said inner position. A locking member carries a second stop and is movable relative to said axle and mounted in said coupling element for rotation relative thereto about an axis of rotation to a locking position, in which said second stop cooperates with said axle to prevent an outward movement of said coupling element from said inner position to said outer position, and to a non-locking position of said locking member, in which said second stop is arranged to permit said outward movement and said locking member engages said coupling element in the sense of said outward movement. A constraining spring extends around and is rotatable about said axis and torsionally prestressed to be normally in frictional contact with said axle and has at one end a spring arm, which protrudes laterally from said axle and engages said locking member. Said constraining spring tends to move said locking member by means of said spring arm in the sense of said outward movement.

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Lambach, Austria

Alfred Obermayer