US1995452A - Choke valve operating attachment for carburetors - Google Patents

Description

March 26, 1935.

J. C. HARBISON CHOKE VALVE OPERATING ATTACHMENT FOR CARBURETORS Filed Sept. 16, 1952 JICCIflzrbison Patented Mar. 26, 1935 CHOKE OPERATING ATTACHMENT FOR CARBURETORS Joseph C. Harbison, Eldorado, Ill. Application September 16, 1932 Serial No. 633,525-

10 Claims.

This invention relates to a choke valve operating attachment for carburetors, and has for its object to provide, in a manner as hereinafter set forth, an automatically operable attachment of the class referred to for materially reducing the consumption of gasoline, the latter being one of the constituents of the combustible mixture; for enabling the use of a cheaper grade of gasoline O with satisfactory results; for materially reducing the fouling of spark plugs and the flooding of the cylinder of the motor; for attaining easier starting of the motor; for obtaining the desired choking action at all times; for reducing the dilution 15 of the lubricant in the crank case thus increasing the life' of the motor; and to attain these ends in a strong, durable, compact, thoroughly eflicient, conveniently adjustable, readily installed and comparatively inexpensive structure not affected by climatic conditions and capable of being employed in connection with any of the forms of carburetors on standard types of automotive vehicles.

To the above ends essentially and to others which may hereinafter appear, the invention,

consists of such parts, and such combination of parts which fall within the scope of the invention as claimed.

In the drawing:

Figure 1 is a side elevation of an internalcom-- bustion motor showing the adaptation therewith of the choke valve operating attachment, the latter being broken away and partly in longi- Y tudinal section.

Figure 2 is a fragmentary view in top plan illustrating the rocker arm.

Figure 3 is a cross sectional view of the exhaust manifold of the motor.

Referring to the drawing, 1 generally indicates 40 a motor of the internal combustion type. The

intake and exhaust: manifolds of the motofare designated 2, 3 respectively. A thermostat 4 is to be disposed lengthwise of the top of the manifold 3, and in the example shown, the latter is peripherally grooved lengthwise thereof in its upper portion, as at 5, formed at one end with an extension 6 and at its other end with a lateral lug 7. Arranged within groove 5 is the thermostat 4 secured at one end, as at 8 to the extension 6. Carried by lug 7 is a pivot pin 9 for a purpose to be presently referred to. A cover 10 is provided for thermostat 4. v

The carburetor of the motor is indicated at 11 which opens into a central, tubular, depending branch 12 of the intake manifold 2. Opening into branch 12 is a structure for dampening the effect of the fluctuations produced in the branch 12 as they are transferred through said structure to a vacuum cylinder to be hereinafter referred to. The said structure includes an angle-shaped 5 member 14 having a horizontal leg 13 opening into branch 12. The member 14 also includes a vertical part 15. The inner diameter of part 13 corresponds to the inner diameter o1 the lower portion 16 of part 15. The remaining portion 17 10 of the latter is of greater inner diameter than that of portion 16 thereby providing part with an internal shoulder 18 constituting a valve seat. The member 14 provides a vacuum dampening chamber 19. Arranged in the portion 17 of member 14 is a vacuum check valve 20 and a .stop 21 for the latter. The portion 16 of member 14 is formed with an angle-shaped by-pass for establishing communicationbetween chamber 19 from below to' above valve seat 18, A closure cap 23 is secured to the upper end of part 15 and is formed with an opening to the wall of which one end of a suction or vacuum pipe 24 is attached. Carried by the portion 16 is a regulating screw 25 for by-pass 22. The part 13- has arranged'therein at its free end a reducing bushing 26. The branch 12 is adapted to have arranged therein' a throttle valve 12. The air intake pipe for carburetor 11 is indicated at 27 and the latter is to have arranged therein a choke Valve 2'7. The stem of the choke valve is indicated at 28 and which has attached thereto, exteriorly of pipe 27, a lever 29 for adjusting the position of the choke valve. Swivelly attached to lever 29 is a barrel 30 and slidably extending through the latter is a shift rod 31 for lever 29. The rod 31 carries and has threadedly engaging therewith a pair of spaced, oppositely shiftable, adjustable abutments 32, 33 arranged to selectively contact with the ends of barrel 30 for the purpose of shifting lever 29.

Supported from a stationary bracket plate 34 is a vacuum cylinder 35 having operating therein a piston 36 carried by a piston rod 37 extended through the rear head 38 of cylinder 35. Connected at its rear end in the forward head 39 of cylinder 35, opening into the latter and having its outer end attached to and opening into the other end of pipe 24 is a header 40. Within the cylinder 35 and abutting the inner face of head 39 is a sealing gasket or packing member 41 having an opening 42 registering with the inner end of .header 40, the latter being of greater inner diameter than that of pipe 24. The gasket or 5 member 41 is in the form of a disc and has edge engagement with the inner face of the cylinder The gasket or member 41 is arranged in the path of piston 36, is engaged by the latter and when engaged abuts throughout the forward face of said piston. The latter and header coact to provide a vacuum or suction line leading from cylinder 35 to chamber 19.

Suitably attached to the outer or rear end of rod 37 is the forward end of a connecting link. 43, the latter having its rear end suitably connected to the lower end of the lever 29. Attached to the lower end of lever 29 is the forward end of a coiled controlling spring 44, the latter having its rear end anchored to a stationary angleshaped supporting bracket 45. Pivotally supported upon the bracket 45 is a horizontally disposed rocker arm 46 to which is attached the rear end of shift rod 31.

The attachment includes an upstanding lever 4'7 controlled from the thermostat 4. The lever 47 is connected atits upper end, as at 48 to the thermostat 4, and is mounted on pivot arm 9 in proximity to said upper end. The lower end of lever 47 is attached to the forward end of a pull rod 49, the latter having its rear end connected to rocker arm 46. l

The rear head 38 of cylinder 35 is provided with a pair of spaced ports 50, 51 which can open directly into the atmosphere, or port 50 may open into a check valve 52 attached to head 38 and port 51 opens into. a regulating" valve 53. The use of check valve 52 and regulating valve 53- is only necessary on highly sensitive motors.

When the motor is cold the lever 47 is held in the position shown by the contracting of thermostat 4 which also controls the movement of rocker arm 46 and shift rod 31 through pull rod 49.- The contraction of spring 44 draws to the position shown the link 43, rod 3'7, piston 36 and lever 29.- The movement of these elements rearwardly will be arrested by abutment 32 and in such rearward movement will cause the air to pass out from cylinder 35 through ports 50, 51.

Now when the motor is started, a vacuum is formed in the intake manifold and chamber 19, but is stopped by check valve 20, it must pass through by-pass 22 where its speed oftravel can be regulated by the screw 25. The air passing through by-pass 22 will cause a vacuum to be formed in the vacuum or suction line and cylinder 35 which causes the piston to move forwardly thereby the. connections between the piston and lever 29 will provide for the opening of the choke valve, but when the barrel 30 comes in contact with adjustment 33 the opening movement of the Y choke valve is checked and further movement thereof is controlled by the thermostat and the connections between the latter and lever 29.

Should the movement'and opening of the choke valve be too fast for a suitable mixture, the motor will sneeze or spit then the vacuum will be instantly changed to pressure in the cylinder thereby allowing the spring to act to instantly close the choke valve. a

The quick choking of the motor when it sneezes or spits is obtained by the use and action of check valves 20', 52. Also the choker gives a slightly richer mixture when the motor is suddenly and violently accelerated before normal operating temperature is reached. This is caused by a slight drop in the vacuum due to the quick open- As the motor warms up to normal operating temperature abutment 33 continues to movein a right hand direction with shift rod 31, caused by the expansion of thermostat until full operating temperature is reached when piston will test against gasket 41 thus sealing the vacuum and abutment 32 will be in contact with swivel barrel thus preventing the spring from closing the choker, until the motor has been stopped long enough for a decrease of temperature, when the thermostat will gradually contract in proportion to the temperature of the motor thus giving at all times a mixture suited to the temperature requirements of the motor by the proper control of the choker valve.

The purpose of the vacuum dampening cham her is to eliminate pulsations of piston when the motor pistons pass dead center.

By the use of reducing bushing, vacuum check valve and by-pass a higher ratio of vacuum is maintained in the vacuum dampening chamber than in the vacuum pipe and vacuum cylinder thus preventing chattering and vibrating of piston. Also that the gasket bearing area of cylinder head 39 not to be confined to any certain-relation to other parts but is to be of such area as to cause the vacuum to hold piston snug against the gasket as soon as its movement is uninterrupted by the abutment 33.

What I claim is:-- r

1. In an automatically operable choke valve operating attachment for carburetors of internal' combustion engines, the combination with the intake'manifold', choke valve and the block of the engine, of a vacuum cylinder adjacent said manifold having a head formed with a single port and a head formed with a. pair of ports and a reciprocatory piston element operating therein and through said double ported head, a vacuum line opening at one end thereof into said cylinder and attached to said single ported head, a valve controlled structure opening into the other end of said line and into the intake manifold of the engine and provided with means substantially as described having provisions for dampening the effect of the fluctuations produced in the intake manifold as they are transmitted to said cylinder, a normally stationary choke valve opening and closing lever, a controlling spring attached at one end thereof to one end of said lever and having its other end anchored with the engine block, an operating connection for said lever secured to the said end of the latter and to and operated from saidpiston element, a thermostatically operated lever, and a shiftable mechanism slidably connected to the choke valve operating lever and to and operated from the thermostatically operated lever for limiting the range of the choke valve operation.

2. In an automatically operable choke valve operating attachment for carburetors of internal combustion engines, the combination with the intake manifold, choke valve and the block of the engine, of a vacuum cylinder adjacent said manifold having a head formed with a single port and a head formed with a pair of ports and a piston element operating therein and through said double ported head, a vacuum line opening at one end thereof into said cylinder and attached to said single ported head, a valve controlled structure providing for dampening the effect of the fluctuations produced in the intake manifold as they are transmitted to the vacuum cylinder and including a valve chamber opening at one end into the other end of said line and at its other end into the intake manifold, a

valve within said chamber, a seat for the valve, a by-pass'extending from below 'to above said seat and a controlling means for the by-pass, a normally stationary choke valve operatinglever, a controlling spring attached at one end thereof to one end of said lever and having its other end anchored with the engine block, an operating connection for said lever secured to the said end of the latter and to and operated from said piston element, a thermostatically operated lever, and a shiftable mechanism slidably connected to the choke valve operating lever and to and operated from said thermostatically operated 1ever for limiting the range of the choke valve operation.

3. An automatically operable choke valve operating attachment of the construction as set forth in claim 1 whereby the said shiftable mechanism includes spaced parallel adjustable parts for controlling the extent of the sliding movement thereof in opposite directions with respect to the choke valve operating-lever.

4. An automatically operable choke valve operating attachment of the construction as set .forth in claim 2 whereby the said shiftaible mechanism includes spaced parallel adjustable parts for controlling the extent of the sliding movement thereof in opposite directions with respect to the choke valve operating lever.

5. An automatically operable choke valve operating attachment of the construction as set forth in claim '1 having combined therewith a gasket arranged within the vacuum cylinder in juxtaposition with respect to the inner face of the single ported head of the cylinder and engageable by the piston element to provide a vacuum seal. y

6. An automatically operable choke valve operating connection of the construction as -set forth in claim 2 having combined therewith a gasket arranged within the vacuum cylinder in juxtaposition with respect to the inner face of the single ported head of the cylinder and engageable by the piston element to provide a, vacuum seal. r

7. In an automatically operable choke valve I operating attachment for carburetors of internal combustion engines, the combination with the intake manifold, choke valve and the block of the engine, of a vacuum cylinder adjacent said manifold having a head formed with a single port and a head formed with a pair of ports and a reciprocatory piston element operating therein and through said double ported head, a vacuum line opening at one end thereof into said cylinder and attached to said single ported head, a valve controlled structure opening into the other end of said line and into the intake manifold of the engine and provided with means sub-' stantially as described-having provisions for dampening the effect of the fluctuations produced in the intake manifold as they are transmitted to said cylinder, a normally stationary choke valve opening and closing lever, a controlling spring attached at-one end thereof to one end of said lever and having its other end anchored with the engine block, an operating connection for said lever 'secured to the said end of the latter and to and operated from said piston element, a thermostatically operated lever, and a shiftable mechanism slidably connected to the choke valve operating lever and to and operated from the thermostatically operated lever for limitingthe range of the choke valve operation, said mechanism including operating attachment for carburetors of internal combustion engines, the combination with the intake manifold, choke valve and the block of the engine, of a vacuum cylinder adjacent said manifold having a single ported and a double,

ported head and a piston element operating therein and through said double ported head, a vacuum line opening at one end thereof into said cylinder and attached to said single ported head, a valve controlled structure providing for dampening the effect of the fluctuations produced in the intake manifold as they are transmitted to the vacuum cylinder and including a valve chamber opening at one end into the other end of said line and at its other end into the intake manifold, a valve within said chamber, a

seat for the valve, a by-pass extending frombelow to above said seat and a controlling means for the by-pass a normally stationary choke valve operating lever, a contrblling spring attached at one end thereof to one end of said lever and having its other end anchored with the engine block, an operating connection for" said lever secured to the said end of the latter and to and operated from said piston element,

a thermostatically operated lever, and a shiftl5 able mechanism slidably connected to the choke valve operating lever and to and operated from said thermostatically operated lever for limiting the range of the choke valve operation, said mechanism including spaces paralleladjustable parts for controlling the extent of the sliding movement thereof in opposite directions with respect to the choke valve operating lever, and a gasket arranged in said cylinder in juxtaposition with respect to the inner face of said single ported head and engageable by the piston element to provide a vacuum seal.

9. In an automatically operable choke valve operating attachment for carburetors of internal combustion' engines, the combination with the intake manifold, choke valve and the block of the engine, of a vacuum cylinder adjacent said manifold having a head formed with a single port and a head formed with a pair of ports and a reciprocatory piston element operating therein and through said double ported head, a vacuum line opening at one end thereof into-said cylinder and attached to said single-ported head, a valve controlled structure opening into the other end of said line and into the intake manifold of the engine and provided with means substantially as described having provisions for dampening the effect of the fluctuations produced in the intake manifold as they are transmitted to said cylinder, a normally stationary choke valve opening and closing lever, a controlling spring attached at one end thereof to one end of said lever andhaving its other end anchored with the engine block, an operating connection for said lever secured to the said end of the latter and to and operated-from said piston element, a thermostatically operated lever, and a shiftable mechanism slidably connected to the choke valve operating lever and to and operated from the thermostatically operated lever for limiting the range of the choke valve operation, said mechanism including a pivoted rocker arm, a. shift rod pivotally connected at its ends respectively to said arm and to said thermostatically operated lever and a pull bar pivotally connected to said arm and slidably connected to said choke valve operating lever.

10. In an automatically operable choke valve operating attachment for carburetors of internal combustion engines, the combination with the intake manifold; choke valve and the block of the engine, of a vacuum cylinder adjacent said manifold having a head formed with a single port and a head'formed with a pair of ports and a reciprocatory piston element operating therein and through said double ported head, a vacuum line opening at one end thereof into said cylinder and attached to said single ported head, a valve controlled structure opening into the otherend of said line and into the intake manifold of the engine and provided with means substantially as described having provision for dampening the effect of the fluctuations produced in the intake manifold as they are transmitted to said cylinder, a normally stationary choke valve opening and closing lever, a controlling spring attached at one end thereof to one end of said lever and having its other end anchored with the engine block, an operating connection for said lever secured to the said end of the latter and to and operated from said piston element, a thermostatically operated lever, and a shiftable mechanism slidably connected to the choke valve operating lever and to and operated from the thermostatically operated 1ever for limiting the range of the choke valve operation, said mechanism including a pivoted rocker arm, a shift rod pivotally. connected at its ends respectively to said arm and to said ried by said choke valve operating lever for slidably and swivelly connecting to such valve said 20 pull bar.

JOSEPH C. HARBISON.

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