Patent GB-865553-A (GB)
Title: Carburetor
IPC: F02M1/10
Filed: 1959-02-25
Abstract: 865,553. Carburetters. BENDIX CORPORATION. Feb. 25, 1959 [May 16, 1958], No. 6557/59. Class 7(3). In a carburetter having one or more barrels each comprising primary and secondary induction passages, the passages of each barrel have a common outlet controlled by a throttle valve actuated by a throttle lever and a valve is mounted in the secondary passage and is controlled by a mechanism comprising a lever disposed for engagement with the throttle lever and a spring operatively connected to the valve in the secondary passage and to the lever to abruptly urge the valve from fully closed position to fully opened position when the throttle valve is opened to a predetermined position. As shown primary and secondary induction passages 18 and 20 respectively (Fig. 5) are formed in each barrel of the main body and these passages are provided with a common inlet 22 and a common outlet 24. The choke valve 26 may be controlled manually or by temperature and/or pressure responsive means. A throttle valve 30 is mounted on a shaft 32 to control flow through the outlet 24. The primary induction passage 18 in each barrel is provided with a large venturi 34 in which is respectively located a small venturi 36. An economizer designated generally by the numeral 44 is disposed in a well 46 located in the fuel bowl 42. Longitudinally spaced ports 62 and 64 are formed in the side wall 50 of sleeve 48 to connect the chamber 54 with the internal bore 66 of sleeve 48. The annular chamber 54 is connected to each of the fuel nozzles 38 posterior the restrictions 40 therein by means of calibrated passages 90. At high vacuum (low absolute pressure) in the induction passage posterior to the throttle valve a piston 96 will be moved upwardly against the force of spring 100 and the economizer valves 76 and 82 will be in closed or seated position. At a predetermined induction passage pressure spring 100 will urge plunger 98 downwardly into engagement with stem 80 to open valve 76 whereby fuel may flow to the fuel nozzles 38. When the abutment 104 is moved by the opening of the air valve 108 the plunger 98 may be urged downwardly by spring 100 sufficiently to move valve 76 into engagement with valve 84 whereby valve 84 will be opened to permit additional fuel to flow to the fuel nozzles 38. A lug or lever 112 is secured to one end of the shaft 110 of the air valve for engagement with a latch or slide lever 114 which is slidably mounted on the main body 14 by a pin 116. Latch 114 is slideable under the influence of gravity to the position shown in Fig. 6 wherein the latch is in engagement with the lug 112 whereby the air valve 108 is prevented from opening. The choke shaft 28 is provided with a rod 119 which is disposed to engage latch 114 when the choke is moved toward open position whereby latch 114 is disengaged from lug 112 when the choke is opened thus permitting the air valve to be opened. A lever 120 provided with a cam follower 122 is rotatably mounted on the end of the air valve shaft 110 opposite the end carrying lug 112. Rotation of lever 120 is limited by spaced bosses 124 and 126 formed on the main body 14. A lever 128 is secured to the shaft 110 adjacent the lever 120 and is provided with a turned over ear 130. A throttle lever 134 secured to throttle shaft 32 is provided with a cam or arm 136 which is adapted to engage cam follower 122 on lever 120. When the throttle valves 30 have been opened to a predetermined position lever 120 through the engagement of cam follower 122 and cam 136 has been rotated sufficiently to cause spring 132 to pass over the axis of shaft 110 to thereby abruptly urge air valve 108 from fully closed position to fully opened position the latter position being determined by engagement of lug 112 with a stop pin 138. The air valve 108 is snapped from fully closed to fully opened position and vice versa by the engagement of throttle lever 134 with lever 120 when the throttle is in first and second predetermined positions. A fast idle cam 146 is rotatably mounted on choke shaft 28 and is weighted to assume a slow idle position (as shown in Fig. 2), under the influence of gravity a rod 174 connects throttle lever 134 with a lever 176 for actuation of an accelerator pump (not shown).