US1283126A - Carbureter for internal-combustion engines. - Google Patents

Description

A. H. R. FEDDEN.

CARBURETER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAR. 28. I917.

Patented 001;. 29, 1918..

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.CARBURETER FOIR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAR-28. 19H.

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ALFRED HUBERT lEtOY FEDDEN, or BRISTOL, ENGLAND, AssIe-Noa OI ONE-HALF T BRAZIL, sTaAKEn & co. LIMITED, or BRISTOL, ENGLAND. 4

Specification of Letters Patent.

Patented @ct. 29, Idle.

Application filed March 28, 1917. Serial NO. 157,948.

To all whom it may concern."

Be it known that I, ALBERT HUBERT ROY FEDDEN, a subject of the King of Great Britain and Ireland, of Motor Works, Flshponds, Bristol, Gloucestershire, England, have invented certain new and useful Improvements in or relating to Carbureters for Internal-Combustion Engines, of which the following is a specification.

This invention relates tocarbureters for internal combustion engines.

A carbureter made in accordance with this I invention comprises a fuel chamber having a fuel inlet or jet as its base, a valve rod provided with a needle valve at its lower end ada ted to coact with the said fuel inlet, means or adjusting the position of the needle with respect to the said fuel inlet permanently for normal conditions and temporarily during the running of the engine, a duct from said chamber to the choke tube below the throttle valve in the induction pipe, the upper end of the ductbeing above the level of the fuel 1n the float chamber, a second duct from said fuel chamber't'o the induction pipe above the throttle valve, and means for admitting air to the said fuel chamber through the valve rod.

In the drawings s Figure 1 is a side elevation of one form of fuel supply. In the float chamber is disposed the float h, balance weight j, and needle valve 70 adapted to operate in the well known manner. Centrally disposed of the float chamber is a fuel chamber m having a fuel inlet a. From this fuel chamber m is a duct leading to the choke tube 0 below the throttle, and a duct leading to the induction pipe above the t rottle. In the fuel chamberm is disposed a valve rod 9 having a needle r-adapted to coact with the fuel inlet n; On the top of the float chamber f is disposed a part 8 having a helical surface which is adapted to coact with the part v having a hehcoidal surface. Sweated into the part 8 is a tube t which surrounds the rod 9 with an air-tight fit. The part a turnson the tube t. The threaded sleeve 11 is provided with a jet control lever to. On the sleeve 2) is a stop it which is adapted to engage with a stop 3/ on the top of the float chamber. An adjusting nut 2 provided with a knurled edge engages the screwed sleeve a. The valve rod 9 is provided with a head 3 having a flange 4 which rests on the adjusting nut 2 and is held in position by a spring 5 provided with a knob 6. The adjusting nut is held against rotation by a spring pressed ball 7 located in the control lever w. The valve rod 9 is hollow and is provided with air inlets 8 and air holes 9, 9 at different heights leading to the fuel chamber m. The duct p is provided with an adjustable slow running nozzle 10 (Fig. 5) which projects into the chamber m, and is provided with holes 11, lland a knurled head 12 which is held against rotation by a spring pressed ball 13.

The permanent adjustment of the valve needle 9" is made by rotating the knurled head 2 in relation to the control lever w and locking them in that position so that when the stop a: in the sleeve engages the stop 3 the needle .7 is at its predetermined normal position in respect to the inlet or jet n.

The temporary adjustment for restricting the flow of fuel to the chamber m and which is especially adapted for use with aircraft and in cars where changesin altitude are experienced is effected by moving the jet control lever '11), which is held by a suitable spring 14 in its normal or raised position, so that it rides down upon the inclined plane 8 whereby the needle 1" enters the jet n and restricts the flow of fuel.

With a carbureter made in accordance .with the invention the valve rodcan be removed without disturbing the permanent adjustment of the needle valve and without breaking any fuel connections, and further the slow running nozzle is likewise adapted fuel through to be removed without breakingl any fuel connection or dismantling any ot r part of the carbureter.

The temporary adjustment can be operated by a Bowden wire mechanism or other suitable means by the pilot or driver and is altogether independent of the throttle.

With a carbureter having a fuel chamber centrally disposed of the float chamber the pressure due to head tending to force the the jet n remains practically constant irrespective of the angle of the carbureter.

What I claim and desire to secure by Letters Patent is 1. In a carbureter for internalcombustion engines, the combination of an induction pipe, a choke tube and throttle valve disposed in said pipe, a float chamber, means for supplying liquid fuel to said float chamber and maintaining the fuel at a constant level, a fuel chamber disposed concentrically with said float chamber, a fuel inlet or jet at the base of said fuel chamber communicating'with said float chamber, a hollow valve rod provided with a needle at its lower end adapted to coact with said fuel inlet or jet at the base of said fuel chamber, means for adjusting the position of the needle with respect to said fuel inlet permanently for normal conditigans and temporarily during the running 0 the engine, a duct from said fuel chamber to the said choke tube below the throttle valve, a second duct from said fuel chamber to the induction pipe above the throttle, and means for admitting air to the said fuel chamber through the said valve rod.

2. In a carbureter for internal combustion engines, the combination of an induction pipe, a choke tube and throttle valve disposed in said pipe, a float chamber, means for supplying liquid fuel to said float chamber and maintaining the fuel at a constant level, a fuel chamber disposed concentrically with said float chamber, a fuel inlet orjet at the base of said fuel chamber communicating with said float chamber, a hollow valve rod provided with a needle at its lower end adapted to coact with said fuel inlet or jet at the base of said fuel chamber, adjusting the position of the needle with respect to said fuel inlet permanently for nor.- mal conditions and temporarily during the running of the engine, a duct from said fuel chamber to the said choke tube below the throttle valve, a second duct from said fuel chamber to the induction pipe above the throttle, means for admitting air to the said fuel chamber through the said valve rod and means for removing said valve rod without disturbing the permanent adjustment of the needle valve.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

ALFRED HUBERT ROY FEDDEN.

Witnesses:

' E. R; HoLLER,

E. TYLER.

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