US2052601A

US2052601A - Automatic choke release

Info

Publication number: US2052601A
Application number: US38188A
Authority: US
Inventors: Harry H Bourn
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-08-28
Filing date: 1935-08-28
Publication date: 1936-09-01
Anticipated expiration: 1953-09-01

Description

I Sept. 1, 1936 BQURN 2,052,601

AUTOMATIC CHOKE RELEASE Filed Aug. 28, 1935 2 Sheets-Sheet 1 Irma/fr Sept. 1, 1936.

I H.- H. BOURN AUTOMATIC CHOKE RELEASE Filed Au 28, 1935' 2 Sheets-Sheet 2 m H x m mud 7n 2 Patented Sept. 1, 1936 UNITED STAS 2,052,601 AUTOMATIC CHOKE RELEASE Harry H. Bourn, Waukesha, Wis.

Application August 28, 1935, Serial No. 38,188

4 Claims.

7 choking the engine and is customarily carried out by a butterfly valve in the air intake controlled from the dash (in the automobile) by a choke rod. However, it is injurious to carry this action too far in that the cylinders will become flooded with gasoline and the engine will be well Another object is to provide an automatic choke release which will not interfere in any way with the normal manual choking of the engine but which as soon as the engine starts and sets -up 'a pressure in the exhaust will automatically open the choke valve.

Another object is to provide a device of this kind comprising a choke valve in the air intake of the engine, a choke valve operating devicecomprising a lever connected to the choke, slide rods connected to' the usual manual choke control wire and resiliently connected to the lever whereby the normal movement of the choke control wire will swing said lever and close the choke valve to choke the engine, and an exhaust pressure controlled valve connected to the said lever whereby the same will be swung to position opening the choke valve as soon as an exhaust pressure is set up in the exhaust pipe by the engine starting. 1

With these and other objects in view the invention resides in the novel construction and arrangementof parts as hereinafter fully .set forth and claimed, reference being had to the accompany drawings wherein:

Figure 1 is a side elevation of my' invention as in position for use upon the intake and exhaust elements of an engine and showing the connection of the usual manual choke control wire.

' Figure 2 is an enlarged perspective view of the choke valve operating mechanism alone.

Figure 3 is an enlarged side elevation of the control valve housing and associated parts.

Figure 4 is a cross section along the line 4-4 5 in .Figure 3. 1

Figure 5 is a cross section along the line 5-5 in Figure 3.

Referring now with more particularity to the drawings the reference character A designatesthe intake manifold, B the exhaust manifold, C the carburetor, D the choke valve in the air intake pipe E, and F the exhaust pipe, all being the conventional parts of an internal combustion engine not shown. The choke valve D is provided with a, crank G and this crank is normally 1 attached to a manual choke wire H which leads back through tubing I to the instrument board J where a button K is afiixed so that by pulling out on this button the valve D is closed (the position shown). holds the choke D in open position.

My invention comprises a choke valve operating mechanism or assembly designated generally at G and made up of a frame 7 formed from heavy sheet metal to provide an elongated base 8 and upturned ends 9 terminating at their upper ends in out-thrust lips it). Bearing ears H are turned up from the lateral margins of the base 8 near the center thereof and have apertures l2 through which a shaft I3 is journaled and extended across and above the upper face of said base. A lever I4 is apertured at one end at [5 to receive the shaft and is split and provided with a clamping screw 16 by which the lever is rigidly anchored to the shaft l3 at a medial point between the ears ll ext/ending upwardly at its free end H from the base 8.

The ends 9 each have a pair of spaced slide rod apertures i8 near their upper extremities and spaced parallel slide rods [9 and 2B are slidably mounted and project at each end through these apertures. Bearing blocks 2| of wood or other suitable material are secured by screws 22 beneath the aforesaid lips l0 and have apertures 23 passing and supporting the ends of the slide rods l9 and 2!). Intermediate their ends the slide rods l9 and 2B are joined by spaced cross bars 26 and 25 apertured at 26 near their ends to take the rods and split and provided with clamp screws 2? to secure them solidly to the rods. The cross bars are set far enough apart to clear both the ends 9 a substantial distance and to allow plenty of play for the lever H3. One, cross bar, as 24, (the one remote from the choke valve D when in use) has a central aperture 28 in which the end of the choke control wire H is mounted and secured by a set screw 29 and the adjacent end and bearing block 2| are centrally apertured at 39 to pass this wire H and its surrounding guide tubing I. The said block 2| Normally a spring as shown at L is slotted at 3! adjacent the aperture 39 and the screws 22 compress the block on the tubing I to anchor it in place.

The other cross bar 25 also'has a central aperture 32 through which a connecting rod 33 is slidably mounted, the said rod having. a head 34 at one end which is placed in a slot or fork 35 in the aforesaid free end ll of the lever I4 where it is pivoted by a pin 36. An expansion coil spring 3? is coiled. around the connecting rod 33 and braced between the head 34 and the cross bar 24 and normally urges the said cross bar forwardly away from the lever l4. A stop collar 38 secured by a set screw 39 to the extended end of the connnecting rod limits this movement as it strikes the said cross bar 25. An operating rod id is pivoted at 41 in the fork 35 in the lever i4 above the said connecting rod head 34 and extends to the operating crank G of the choke valve D where it is pivotally attached as shown.

The operating mechanism as thus far described is mounted in any suitable manner on the en-' gine preferably at the rear of the carburetor C but in any position so that with the operating rod. connected as described the normal position of the parts will hold the choke valve D in open or running position. Then a pull on the choke control wire H will pull the slide rods i9 and 29 sliding them through their mounting blocks and apertures and compressing spring 3? until the pressure on the lever i4 swings it to the rear. and closes the choke valve D to choke the engine in usual manner. It will thus be evident that this device interferes in no way with the normal manual manipulation of the choke by its control wire.

An exhaust control valve assembly is provided comprising a housing 42 of elongated form of inverted box-shaped form at its center section 43 and with reduced

ends

44 and 45 arcuate or semicircular in cross section as shown. haust pipe F has an upper half portion sawed or cut out as shown at F in Figures 3 and 4 and the housing 42 is set over the pipe with the center section 43 resting over this cut out and the

ends

44 and 45 fitting closely around the pipe at each end of the out out. Annular parted clamp bands '46 are then placed over the

ends

44 and 45 and the pipe F and the clamp screws 41 drawn tight rigidly mounting the housing 42 on the pipe. It will be noted that the lower side margins 48 of the housing depend down past the lower edges of the cut out or opening F and long strip gaskets 49 are placed between these margins and the pipe to prevent the escape of gases from the pipe. The

extremities of the said lower margins 48 of the extended out a short distance around these apertures. A shaft 56 is journaled through these apertures 53 and a valve blade 5'! is riveted or otherwise secured at 58 to the shaft within the housing. This blade 51 is flat and of such shape and'size that it may swing downward into the pipeF or. upward clear of the pipe into the housing 42' and .in the former position will substantially close all passage through the pipe as shown.

2,052,601 7 7. One end of the shaft 56 is extended as at 59 and The exa lever 60 is secured by its aperture Bland split clamping arrangement 62 thereon. The face of the lever 60 adjacent the extension sleeve 55 on that side hasa recess 63 receiving an asbestos packing gasket to prevent the escape of gas around the shaft at that point. A' packing cap' or gland 65 is threaded over the sleeve 55 on the this opening. A center clamp band'H is placed over the pipe F, housing 42 and this cap 69 and the screws 12 drawn tight to press the cap to its seat. An asbestos gasket 73 may be placed within the cap to seal the joint and the cap may have a boss 73 engaging a socket i4 in -the band H to locate the cap and band In use the housing 42 is mounted as described on the exhaust pipe F below and to the rear of the choke operating unit previously described and with the side ofthe housing at which the shaft 56;; V is mounted turned to the front or towardthe:

engine. parted clamping end '15 to the extended end'rof the aforesaid shaft 13 and the forked ends ll of;

this lever and the lever 60 are pivotally connected by a control rod-13 pivotally mounted at its ends at l9 to the said lever as shown. Axial displacement of the shaft I3 may be prevented by: a bearing collar 88 secured by a set screw 8 I to the shaft within the adjacent bearing ear U A lever i5 is secured by its apertured' With the parts arranged as shown andf dea scribed the aforesaid swinging of the lever I4,

back to close the choke valve D will swing the valve blade 51 down into the exhaust pipe F as shown in Now as soon as the engine starts'the.

Figure 1.

pressure of the exhaust gas in .theipipe will swing; the valve blade 57 back up into-the housing clear;

of the pipe and the resulting movement ,of the.

connected levers BOand 15 will swinggthe operating lever 1 back forwardly; and will open the choke valve D holding the same in this position and returning the parts to their initial positions;

as will be understood. Since this action is auto-g matic and under controllof the starting of the engine excess chokingwill be entirely prevented.

While I have herein set forth. acertain pre- V ferred embodiment of my invention, it is understood that I may vary fromthe; same in minor;

structural details, so as best 'to'construct; a practicaldevicefor the purpose intended; not depart ing from the spirit of the invention and withinthe scope of the appended claims. j-

Iclaimz; I 1. In'combination with the chokevalve, man;

ual choke control wireand exhaust pipe .of an automobile, a choke valveoperating mechanism comprising a frame, an operating lever pivoted in V the frame and connected'to the-choke valve, a, slide rod assembly slidablymounted; in theframe and resiliently connected to-the lever, the :said

slide rod assembly being'also connected to the;

manual choke control wire whereby manipulation of this wire will operate :the lever. to close. the said choke valve, and a'control valve' mechanism will open the choke valve. 5

attached to the exhaust pipe and to the 'said'opf erating lever whereby pressure in the exhaust pipe 2. 'In combination with the choke valve'pchbke valve control wire and exhaust pipe of" an automobile engine, a choke valve operating mechanism comprising a frame, an operating lever pivotally mounted in the frame and connected to the choke valve, slide rods slidably mounted in the frame at each side of the lever, cross bars secured to the slide rods, the said choke valve control wire being secured to one cross bar, the other cross bar having an aperture, a connecting rod pivotally connected to the lever and slidably mounted through the said aperture, an expansion coil spring coiled over the connecting rod and braced between the lever and the cross bar, a stop collar at the end of the connecting rod on the side of the cross bar remote from the spring, and a control assembly mounted on the exhaust pipe and controlled by the pressure therein to actuate the said operating lever and open the choke valve.

7 3. In combination with the choke valve, choke valve control wire and exhaust pipe of an automobile engine, a choke valve operating mechanism comprising a frame, an operating lever pivotally mounted in the frame and connected to the choke valve, slide rods slidably mounted in the frame at each side of the lever, cross bars secured to the slide rods, the said choke valve control wire being secured to one cross bar, the other cross bar having an aperture, a connecting rod pivotally connected to the lever and slidably mounfted through the said aperture, an expansion coil spring coiled over the connecting rod and braced between the lever and the cross bar, a stop collar at the end of the connecting rod on the side of the cross bar remote from the spring, a housing mounted on the exhaust pipe, the said pipe having an opening into the said housing, a valve blade pivotally mounted in the housing and adapted to swing into the exhaust pipe through the said opening therein, and means connecting the said valve blade and operating lever whereby the choke valve will be opened by exhaust pressure in the exhaust pipe.

4. In combination with the choke valve, choke valve control wire and exhaust pipe of an automobile engine, a choke valve operating mechanism comprising a frame, an operating lever pivotally mounted in the frame and connected to the choke valve, slide rods slidably mounted in the frame at each side of the lever, cross bars secured to the slide rods, the said choke valve control wire being secured to one cross bar, the other cross bar having an aperture, a connecting rod pivotally connected to the lever and slidably mounted through the said aperture, an expansion coil spring coiled over the connecting rod and braced between the lever and the cross bar, a stop collar at the end of the connecting rod on the side of the cross bar remote from the spring, a housing comprising a square inverted boxshaped central section and arcuate ends seated over the exhaust pipe, clamps around the said ends and the pipe, the said pipe having an opening communicating with the said central section of the housing, a shaft journaled through the center section ofthe housing adjacent the frontal end thereof, a valve blade secured to the shaft within the housing, a lever secured to the shaft outside the housing, a lever attached to the said operating lever of the valve operating mechanism, and a link connecting the said levers.

HARRY H. BOURN.