Patent GB-274078-A (GB)
Title: Improvements in or relating to carburetters
IPC: F02M19/08
Filed: 1927-07-04
Abstract: 274,078. Haefeli, A. July 8, 1926, [Convention date]. Addition to 263,140. Spray carburettors. - The rectangular-sectioned choke tube of the carburettor described in the parent Specification is connected to a circular-sectioned induction pipe by an adapter 34, Fig. 1, having a circular exit the same size as the pipe. Fig. 4 shows means for adjusting the area of the nectangular choke.tube comprising a resilient plate 74, the curvature of which may be adjusted by a screw 73. The nozzle may be tubular and provided with a slot at the top and a number of holes at the bottom, and be strengthened by a cross-partition. In this case, when the upper slot is partly closed bv a sliding throttle, air enters the hollow nozzle and aerates the fuel before it enters the choke tube. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the carburettor shown in Fig. 1 (Cancelled), in which fuel, maintained at a level 11 in a trough-shaped reservoir by a float chamber, is supplied to a rectangular choke tube, through a slot 9 extending the whole length of a rotatable rod-shaped fuel nozzle 8, the outlet being restricted by a resilient. plate 12, or a slotted sleeve 24, Fig. 8 (Cancelled), rotatably mounted and fitting around the nozzle 8 so that relative movement of the sleeve and nozzle adjusts both the size and direction of the outlet for the fuel. The nozzle 8 may be rectangular in cross-section, and be attached to the carburettor casing on one side only, the other side being free. for relative heat-expansion, and having the plate 12 attached to it. Two or more grub screws may be screwed transversely through the nozzle to keep it from seizing in its housing. As shown in Fig. 8 (Cancelled), the fuel is aerated by air entering through longitudinal grooves 25, 26, and transverse bores 27, 28. Fig. 1 shows a piston throttle-valve 29 which may be slid longitudinally over the rectangular choke tube, the extent of the opening being limited bv a number of grooves 30, 31, 32 of varying lengths, any one of which may be arranged to engage a set screw 33 as desired. As shown in Fig. 15 (Cancelled) a pin 44 fixed to the piston valve 29 regulates the amount of the slot 9 in the nozzle which is under engine suction, and the closed or slow running position is regulated by a screw connection 41 with the control lever 40. A supply of extra air may be provided by a slot 59, Fig. 18 (Can.- celled), located between the nozzle and the piston valve, the effective area of the slot being regulated by the edge of the piston valve, or by the pin 44, Fig. 15 (Cancelled), or by an additional pin fixed to the piston valve; a rotary flattened rod regulates the air supply. If the induction pipe is vertical the piston valve is arranged at the perpendicular connection with the choke tube, and instead of being circular in cross-section it may be formed as shown in Fig. 18 (Cancelled), and comprise two eccentric facings having radii of curvature 64, 45, as shown. According to a further modification, shown in Fig. 20 (Cancelled), which is a further transverse section of the choke tube 81 and of the piston valve 77, extra air is admitted through a valve 85 and a chamber 78, connected to the choke tube by a passage 80, and regulated in volume by a sliding member 79, which is attached to the piston valve 77; fuel is admitted through a slotted valve 84 from a trough 75, as described above: the valve 85 may be connected to and controlled simultaneously with the piston valve 77. This subject-matter does not appear in the Specification as accepted.