Patent GB-205844-A (GB)
Abstract: 205,844. Brunton, J. L., and Brunton, W. P. May 26, 1922. Bowden mechanism is applied to the automatic control of an internal-combustion engine ignition lever both from the throttle lever and from the induction manifold or a governor. Various arrangements comprising one or two inner wires and one, two, or three outer casings are described. In the construction shown in Fig. 16, the spark advance lever 5 of a magneto 6 is actuated by one end of a Bowden casing 2, the other end of which is connected to the throttle lever 4. The inner wire 1 is connected at one end to a governor or to a piston 8 in a cylinder 7 connected to the induction manifold 9, the other end of the wire being fixed. Slight movement of the lever 4 to sta.rt the engine produces suction in the manifold 9 and the wire 1 is pulled, carrying with it the adjacent end of the casing 2 and the lever 5 to advance the spark. Further movement of the lever 4 causes the casing 2 to slide on the temporarily stationary wire 1 and further advance the lever 5, but at the same time to decrease the suction in the manifold 9 and thus to some extent to retard the spark. As the engine speeds up, the suction increases and further advances the spark lever. In this and in other forms of the invention, additional sections of casing 2 may be employed to act merely as guides and protectors to the inner wire or wires, and means may be provided for adjusting the nominally stationary end of the inner wire. Fig. 7 shows a modification in which the positions of the levers 4, 5 are interchanged. Movement of the lever 4 slides the casing on the wire as before, but the pull of the piston 8 on the wire 1 lifts the loop of the system and presses upwards the opposite end of the casing 2 to advance the lever 5. In the form shown in Fig. 15, the piston 8 and lever 4 pull on opposite ends of the wire 1 and raise the lever 5 operated by the movable end of the casing 2. In a modification, the positions of the lever 4 and piston 8 are interchanged, and the lever 4 acts on the end of an auxiliary casing 2 to pull the wire 1, instead of acting directly on the wire. Fig. 6 shows a form in which the wire 1 is connected to the piston 8, passes through a casing 2 with one movable end operating the lever 5, thence through a second casing 2 with a movable end engaging the lever 4, and finally through a fixed guard casing 2 to an adjusting-means x. Operation of the lever 4 bends the loop of its casing 2 and draws in the end of the wire 1 adjacent to the lever 5; pull on the wire 1 draws down with it the end of the casing 2 operating the lever 5. Thus two casings 2 co-operate to actuate the lever 5 when the lever 4 is not moved. When the piston 1 rises, the adjacent casing 2 is straightened out to press down the lever 5, the casing 2 to which the lever 4 is secured acting merely as a guide during the operation. In a modification, the positions of the levers 4, 5 are interchanged. Fig. 8 shows a construction in which the lever 5 is operated by the movable casing end of one Bowden system of which the opposite end of the wire 1 is secured to a slide 36, which is operated as is the lever 5 in the construction shown in Fig. 6. In a modification of this form, in order to effect a pull on the wire 1 from the lever 4, the lever acts on the adjacent end of the casing 2 through which the wire passes to the adjustable anchorage. In a further modification, the slide 36 is operated as is the lever 5 in the construction shown in Fig. 16. Fig. 10 shows a simplified form of the invention in which only the lever 4 acts upon a casing end to operate the lever 5, the piston 8 being connected directly to the lever 5 by the wire 1. Fig. 1 shows an arrangement of parts on a vehicle, the mechanism acting in the same manner as that shown in Fig. 16. The cylinder 7 is connected by a part 21 to the manifold 9 and is carried by a bracket 14 on a rod 10 secured by a bracket 11 to the vehicle frame 12. The fixed end of the wire 1 is secured to a bracket 18 on the rod, which also carries a bracket 19 supporting a sleeve 24 containing a spring 23, Fig. 16, connected to the lever 5 on the separately supported magneto 6. Guide casings 30, 31 protect exposed parts of the wire 1. Another arrangement corresponding to Fig. 7 is also shown, certain of the parts being supported by suspension links from brackets on the rod 10.