US1962850A - Electrically controlled mechanism for a thermostatic choking device - Google Patents

Description

- June 12, 1934- K. N. WILLMORE ET AL ELEGTRICALLY CONTROLLED MECHANISM FOR A THERMOSTATIC CHOKING DEVICE Filed Feb. 8, 1952 2 Sheets-Sheet 2 gwuwms MIG/{I'M WIIlMObE CAR O STUCKER AFC/l R CA/YROLL Patented June 12, 1934' UNITED STATES ELECTRICALLY commoner) mzcnmsm FOR A VICE THERMO STATIC CHOKING DE- Knight N. Willmore, Arch P. Carroll, and cal-1 0 Stucker, Fairfax, Okla.

Application February 8, 1932, Serial No. 591,706

8 Claims. (Cl. 123-179) This invention relates to an electrically controlled mechanism for a thermostatic choking device for use in connection with internal combustion engines or motors. The present invention is an enlargement or improvement upon the previous application filed by us September 26, 1931, Serial Number 565,368, and relating to Thermostatic carburetor choke devices.

The principal object of the present invention is the production of an electrically controlled device which electrically controls the choke'after the starting of the engine without the necessity of manually actuating a choke valve.

A still further object of this invention is the production of a simple and efllcient electrical mechanism which will automatically control the choke valve and which will also automatically return to a resetting position as the thermostat associated with the electrical mechanism cools. With these and other objects in view, this in.- vention consists in the novel construction, combinations and arrangements of parts as will be hereinafter fully described and claimed.

In the drawings: s

Figure 1 is a side elevation of the electrical control device used in connection with a heatv control damper mounted in the elbow which connects to the exhaust manifold, the casing or cover plate of the casing which supports the electrical mechanism being broken away to show the interior mechanism mounted within the casing;

Figure 2 is a longitudinal sectional view through a portion of the exhaust manifold, -and also showing the thermostatic control valve casing and electrically controlled mechanism in longitudinal section;

Figure 3 is a section taken on line 3-3 of Figure 1;

Figure 4 is a section taken on line 4-4 of Figure 1;

Figure 5 is a side elevation of the electrical mechanism shown in the second position, the electrical mechanism in Figure 1 being shown in the first position; and

Figure 6 is a side elevation of the electrical control mechanism shown in its third position;

By referring to the drawings, it will be seen that 1 designates the exhaust manifold of the usual type, to which may be secured an elbow 2 within which is pivotally mounted the heat controlled damper 3, which damper 3 may be actuated in any suitable or desired manner, manually or otherwise, by means of a suitable con-' nection secured to the operating arm 4. A casing 5 is connected at one end to the elbow 2 and the opposite end of the casing 5 is connected to a suitabledischarge pipe 6 which may be in turn again secured in any; suitable or desired. manner at its end 7 to the exhaust manifold 1. Within the casing 5 is pivotally mounted the butterfly valve 8 upon a supporting shaft 9, and this valve 8 is connected to a thermostatic coil spring 10 which is coiled upon the supporting shaft 11, this structure being similar to the structure as illustrated in my application Serial Number 565,368, filed September 26, 1931, the shaft 11 being mounted upona frame 12 which is pivoted at one endupon the supporting screws 13. The butterfly valve 8 is adapted to be opened and closed by the'expansion and contraction of the thermostatic coil spring 10. An adjusting screw '14 passes through the casing 5 adjacent the supporting shaft 9 of the butterfly valve 8 and in such a position as to extend across the face of the valve when so desired, and constitute a stop whereby the position of the valve may be properly adjusted, so that this butterfly valve 8 may be fully closed when the choke valve 15 cooperating therewith, is fully open. The'choke valve 15 is connected for simultaneous movement with the butterfly valve 8 through a mechanism which will be hereinafter described. The electrical mechanism for controlling theoperation of the butterfly valve 8 is mounted within a housing 16 which is formed upon the side of the casing 5, as shown in Figure 2, and a cover plate 1'7 is employed for closing the outer face of the housing 16, as shown. The casing 5 may be securely fastened to the manifold 1 by means of the substantially U-'- shaped bolts 18 which engage the laterally ex tending ears 19 of the yoke 20, this yoke 20 being provided with projecting flanges 21 which are adapted to abut against the manifold'l, as shown in Figure 4,and' by tightening the nuts 22 upon the substantially U-shaped bolt' 18, the'yoke 20' should be noted that the supply of current for operating the thermostat is merely taken from the starting motor terminals by parallel line36, and is not wired in series with the starter. The

opening or closing of the points of the thermostat in no way interferes with the operation of the'starting motor as a sufiicient supply of current is available through the starting motor cable to operate both. The sleeve has secured thereon an armature 27, and a coil spring 28 has one end thereofsecured to the pin 29 carried by the armature 27, and the opposite end of the coil spring 28 is secured to the pin 24 which is carried by the collar 23. This spring 28 is adapted to normally raise the armature 27 as soon as the electro-magnetis de-energized as'will be hereinafter more fully described. The armature 27 isprovided with a notched rear end 31 through which the pin 24 extends, the notch 31 permitting a limited free swing of the armature 27 with respect to the pin 24, as'will be obvious by considering Figure 5 of the drawings. As shown in Figure 1, an electro-magnet is mounted within the housing 16, and is adapted to draw the armature arm 27 downwardly as soon as the electromagnet 30 is energized. A choke control arm 32 is adjustably looked upon the sleeve 25 by means of the set screw 33 and this choke control arm 32 is connected to the choke valve 15 by means of a link 34 which engages the choke operating arm 35, shown clearly in Figure 1.

The electro-magnet 30 is electrically connected to a wire 36 which passes to the starting motor terminal of the starting motor 37, and this starting motor terminal of the starting motor 37 is connected to a starting motor switch 38 of the usual type, this switch being in turn connected to a suitable source of electrical supply 39 which is grounded, as at 40. The electro-magnet 30 is also connected to a wire 41 which in turn is connected to the contact point 42, hereinafter described.

As shown in Figures 1, 4, 5 and 6, there is provided a sectional circuit-breaking arm which is used in conjunction with the armature arm 27, and this arm 27 carries a laterally extending pin 43 which pin 43 is adapted to fit in between the fingers 44 and 45 of the upper hinged section 46 of the sectional circuit-breaking arm 47. This sectional circuit-breaking arm 4'7 comprises an upper hinged section 46 which fits in the bifurcated end 48 of the lower section 49 of the arm 47. A coil spring 50 is secured at its respective ends to the respective outer ends of the sections 46 and 49 of the sectional circuit-breaking arm 47 in such a manner as to cause the sections 46 and 49 to rock upwardly when the arm 47 is moved to a position to cause the spring to extend to one side of the pivot point 51, and to cause the sections 46 and 49 to swing in the opposite direction when the arm 47 is moved to a position to bring the spring 50 to the opposite side of the pivot point 51,.as will be hereinafter described. The lower section 49 of the sectional circuitbreaking arm 47 is provided with a contact point 52 which is adapted to contact with the contact point 42 carried by the circuit-breaking arm supporting plate 53. A stoppin 54 is carried by the upper end of the plate 53 to limit the swing of the section 46 of the arm 47 in a rearward direction, and the stop pin 55 is carried by the lower end of the plate 53 to limit the swing of the lower section 49 of the sectional arm 47 in one direction. The plate 53 carries an angle bracket or extension 56 through which the contact point 42 passes, this contact point 42 being insulated with respect to the plate 53. The lower section 49 of the sectional circuit-breaking arm 47 is grounded, as at 57.

Assuming that the motor is cold and the thermostatic coil 10 has fully contracted, the arm '32 and the armature 27 as well as the choke valve 15 on the carburetor 58, are in the approximate position as shown in Figure 1. This may be referred to as the first position. In this position, the contact points of the circuit-breaking arm 47 are closed, as illustrated, particular reference being made to the contact points 42 and 52. The sleeve 25 is free to rotate upon the shaft 9, but is held in its proper position by the coil spring 28 shown in Figure 1. The slot in the end of the armature arm 27 which fits over the pin 24 carried by the collar 23 allows the arm 27 to oscillate on the shaft independently of the thermostat but under tension of the spring 28.

When it is desired to start the motor, the

starting motor switch 38, is actuated and this completes an electric circuit through the magnet 30, through the circuit- breaker contact points 42 and 52, the lower section of the arm 47 and to the ground through the ground wire 57. As the electro-magnet 30 is magnetized, the armature arm 27 will be attracted and pulled downwardly to the position shown in Figure 5 of the drawings, which may be referred to as position 2. This in turn moves the choke valve 15 of the carburetor 58 to the position shown in Figure 5. The motor will then start and the starting motor switch is disengaged, thereby breaking the circuit through the magnet 30, and this will release the armature arm 27 as well as the arm 32, which will return to its normal position suchas is shown in Figure 1, .or -to the position 1. The choke valve 15 of the carburetor is so adjusted that the motor will run properlyin this position and as it continues to do so the heat of the exhaust gases begin to expand the thermostatic coil 10, thereby lifting the arm 32 to turn open the choke valve of the carburetor until the motor is fully warmed up and the choke valve 15 and arm 32 are in position as shown in Figure 6, which may be referred to as the third position. As the motor warms up causing the arm 27 to rise, the circuit breaker is also operated until the arm of the same passes over the center axis and the contact points are separated through the medium of the spring 50 being moved to the position shown in Figure 6 and beyond said pivot point 51. This movement is occasioned by the pin 43 pushing upwardly upon the finger 45 and swinging the upper section 46 of the sectional arm 47 to the position shown in Figure 6, the'armature '27 being moved and capable of movement to a position beyond the finger 45, such as is shown in Figure 6. For this reason the finger 45 is made shorter than the finger 44 to permit the armature arm 27 to have this extended movement and to permit the pin 43 to pass out of engagement with the finger 45, the finger 44 preventing such disengagement on the downward movement of the armature arm 27. The plate 53 is slotted as at 53', and suitable screws 54 pass through the slots 53 and any number of slots may be provided as well as any number of securing means whereby the plate 53 may be properly adjusted within the housing 16, and thereby permit the relative position of the carburetor choke valve to be varied when-desired. This will permit the position of the separation of the points 42 and 52 to be regulated or adjusted by virtue of the slot openings described. In actual practice, the device is so adjusted that when this stage of its operation just described is reached, the motor no longer needs to be fully choked and as the circuit has been broken through the magnet 30, the armature 2'1 will not be attracted if the starting motor switch is engaged. As the arm 2'7 continues to rise to the position shown in Figure 6, or assumes the position shown in Figure 6, the engaging pin 43 in the outer end of the armature 27 slips out of the slotted openings in the fingers 44 and 45 thus permitting the spring 50 to pull the sections 46 and 49 of the arm 47 against the stop pins 54 and 55 respectively, for keeping the contact points separated. When the motor is stopped and begins to cool, the above actions are repeated in reverse order and the various parts are returned to their respective positions to their starting points.

From the foregoing description, it will be seen that a very simple and efficient means has been produced for electrically controlling the opening and closing of the choke valve of a carburetor in conjunction with the certain thermostatically controlled means which will automatically return the various parts to their normal positions as the engine cools.

It should be understood that certain detail changes in the mechanical construction may be employed without departing from the spirit of the invention so long as these changes fall within the scope of the appended claims.

Having described the invention, what is claimed as new is:- I

1. An electrically controlled means for actuating a choke valve of an engine comprising an op erating shaft, an armature mounted upon said shaft, an electro-magnet for swinging said armature, means mounted upon said shaft and cooperating with said armature for permitting a limited swing of said armature independent of said shaft, electrical control means for said armature, and means actuated by said armature for breaking the circuit through said electro-magnet.

2. An electrical mechanism for controlling the operation of a choke valve of an engine comprising an operating shaft, an arm loosely mounted upon said shaft, means keyed to said shaft for limiting the independent swing of said arm upon said shaft, an electro-magnet for pulling said arm in one direction, spring means for moving the arm in the opposite direction when released, electrical means for actuating said electro-magnet, and circuit-breaking means actuated by said arm for deenergizing said electro-magnet at a predetermined point.

3. In combination with a thermostatically operated shaft, an arm carried by said shaft and loosely mounted thereon, means keyed to said shaft for limiting the independent swing of said arm upon said shaft, an electro-magnet for pulling said arm in one direction, means forelectrically controlling the operation of said electro-magnet, a circuit-breaking arm, said circuit-breaking arm comprising a pair of pivotally connected mem bers, one of said members provided with a forked projection, means carried by said first-mentioned arm for engaging said forked projection, the other section of said circuit-breaking arm provided with a contact means, means electrically connected with said electro-magnet for contacting with said first-mentioned contact means, means for pivotally supporting said circuit-breaking arm, and spring means connected to the sections of said circuit-breaking arm for moving said contact points carried thereby to an open position as said first-mentioned arm is raised to a predetermined position.

4. The combination with a thermostatically controlled shaft, a collar keyed to said shaft, a

laterally extending pin carried by said collar, an armature arm loosely mounted upon said shaft and 'provided with a notched end, said notched end straddling said pin, said pin permitting a limited freedom of swing of said armature arm with respect to said collar and causing said arm' armature arm loosely mounted upon said shaft and provided with a notched end, said notched end straddling said pin, said pin permitting alimited freedom of swing of said armature arm with respect to said collar and causing said arm to swing with said collar when said armature arm is moved to a predetermined position, spring means for normally raising said armature arm, electromagnetic means for pulling said armature arm downwardly, circuit-breaking means actuated by the outer end of said armature arm, and means for electrically connecting said electr c-magnet with said circuit-breaking means.

6. An electrically controlled means for actuating a choke valve of an engine comprising a choke valve supporting member, an armature for moving said supporting member, means for permitting limited relative movement between said supporting member and said armature, electro-magnetic means for moving said armature, and means actuated by said armature for breaking the current through said electro-magnetic means.

7. The combination with an exhaust manifold, a thermostatically controlled butterfly valve mounted therein, a shaft for supporting said thermostatically controlled butterfly valve, a collar keyed to said shaft, a laterally extending pin carried by said collar, an armature arm loosely mounted upon said shaft and provided with a notched end, said notched end straddling said pin, said pin permitting a limited freedom of swing of said armature arm with respect to said collar and causing said arm to swing with said collar when said armature arm is moved to a predetermined position, spring means for normally raising said armature arm, electro-magnetic means for pulling said armature arm downwardly, circuit-breaking means actuated by the outer end of said armature arm, means for electrically connecting said electro-magnet with said circuitbreaking means, a choke valve, and means operably connecting said choke valve with said butterfly valve supporting shaft whereby said choke valve will be moved to an open position as said butterfly valve is moved to a closed position.

8. The combination with an exhaust manifold, a thermostatically controlled butterfly valve mounted therein, a shaft for supportingsaid thermostatically controlled butterfly valve, a collar keyed to said shaft, a laterally extending pin carried by said collar, an armature arm loosely mounted upon said shaft and provided with a notched end, said notched end straddling said pin, said pin permitting a limited freedom of swing of said armature arm with respect to said collar and causing said arm to swing with said collar when said armature arm is moved to a predetermined position, spring means for nor-,

- circuit-breaking means,

mally raising said armature arm, electro-mag- ,netic means for pulling said armature arm downwardly, circuit-breaking means actuated by the outer end of said armature arm, means for electrically connecting'saidelectrmmagnet with said a choke valve, means operably connecting said choke valve with said butterfly valve supporting shaft whereby said choke valve will be moved to an open position as

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