Patent GB-673542-A (GB)
Title: Improvements in auxiliary starting carburetters
IPC: F02M1/04
Filed: 1949-03-15
Abstract: 673,542. Spray carburetters. SOLEX. March 15, 1949 [March 18, 1948], No. 7095/49. Class 7(iii) An auxiliary starting carburetter 15 comprises a single valve 18 adapted to reciprocate between an air inlet of 19 and a mixture outlet 28 communicating with the induction passage 25 of an I.C. engine for varying both the volume and the richness of the mixture supplied thereto and resilient means responsive to temperature and manual operation for acting on said valve in the closing direction of the air inlet against the action-of the reduced pressure acting on the valve from the mixture outlet. The auxiliary carburetter has a fuel inlet 11 which is connected to a 'tank 3 whilst its air inlet 19 communicates with the atmosphere or the air intake of the main carburetter 1. The valve 18 is actuated by a lever 29 mounted on a spindle 30 which is operated manually or by a thermostat heated by the exhaust pipe 39. When the auxiliary carburetter is inoperative the valve is closed by a spring-actuated ball which engages the lever 29. On starting, the valve is positioned as shown, whereupon a rich mixture enters the pipe 25, but as the engine warms up the additional suction results in an increasing supply of air thereto. In a modification, Fig. 4, the valve 18 comprises two relatively movable discs 18a, 18b having a spring therebetween. Two fuel inlets 16a, 16b are used and the disc 18b has circumferential ports 49 which permit communication between the pipe 25 and the inlet 16b, when the disc 18b blocks the inlet 16a, until such time as the discs abut. In a second modifification, Fig. 7, the strip 31 acts directly on a rod 30a which carries the discs 18a, 18b, and the disc 18b has orifices opposed relative to the fuel inlet 11 and the outlet 24. This second modification may include a diaphragm, Fig. 14, (not shown), which acts on the rod 30a and communicates with the conduit 24. Moreover, exhaust gases may be circulated between the turns of the bimetallic strip. To permit a sufficient flow of air whilst idling, the stem of the valve 18 carries a slide valve which controls a secondary air inlet into the induction pipe, Fig. 11, (not shown)'. In a further modification, Fig. 12, (not shown), the bimetallic strip actuates the rod 30a through a linkage system. Again, the strip 31 may be heated by a resistance which is supplied from the battery, Fig. 6, (not shown), and encased in heat-conducting material. A plate may also be used to absorb and later restitute heat to the strip 31 when the engine is idle; a temperature control unit may be incorporated in this modification. The manually operated control is effected through an arm 33 which acts on the spindle 30 through a spring. In a further modification, Fig. 13. the valve casing has three chambers 71, 72. 73 communicating with the air supply, fuel supply and the induction pipe respectively. The valve is in two parts as shown, or combined as in Fig. 1, and is controlled bv a plate 81 which is deflected by the spindle 30b. The valve stem 78 may control an idling air inlet 88. Specification 357,310 is referred to.