US1764621A - Choke-operated throttle - Google Patents

Description

June 17, 1930. J. GOOD CHOKE OPERATED THROTTLE Filed Feb. 20, 1926 Patented June 17, 1930 UNITED STATES PATENT OFFICE JOHN GOOD, OF GARDEN CITY, NEW YORK, ASSIGNOB TO GOOD INVENTIONS 00., OF NEW YORK, N. Y., A GOBPOEATION OF NEW YORK CHOKE-OPERATED THROTTLE Application filed February 20, 1926. Seria1 No. 89,553.

The present invention consists in the provision of a suitable connection between the choke and the throttle whereby operation of the choke necessarily results in a predetermined opening of the throttle.

As a result of this arran ement the engine will turn over somewhat aster than at the normal idling speed and the device therefore serves as a reminder to the driver that the choke is in operation.

Without departing from the spirit of the invention the device can be embodied in numerous forms to suit the particular choking arrangements obtaining in the various makes of carburetors and it will be understood that the following description and the accompanying drawings are merely exemplary of one particular form of the invention, the form in question being illustrated and described as applied to a carburetor of the zenith type.

In order that the invention may be readily understood reference is made to the accompanying drawings in which Fig. 1 shows schematically an automobile engine hood, throttle and choke arrangements with one form of the invention applied thereto, and Fig. 2, shows on'a lar er scale the carburetor and choke-operated t rottle.

Referring to the drawings in detail, it will be seen that the throttle valve 1 is operated, as is usual in .this type of carburetor, by the rock shaft 2, rock arm 3 and pedal connection 4. Similarly the choke valve 5 is operated in the usual manner and by means of the rock shaft 6 and arm 7. Secured to the shaft 6, or integral with the arm 7, is a quadrant 8 having at the ends of its curved portion stops 9 and 10. Adjacent one end of the curved portion of the quadrant is the I depression 11 in which seats the end of one arm 12 of a bell crank lever which, herein, is secured to the carburetor by and pivoted on the screw 13. The arm 14 of this lever extends upwardly to a point adjacent the end of the arm 3 and is provided with an adjusting screw 15. Spring means is provided to retain the end of the arm 12 in contact with the quadrant 8, such means herein comprising a suitably mounted plunger 16 and spring 17. To adjust the gas flow for normal idling there is provided the usual adjusting screw 18.

' When the choke 19 is withdrawn to close the valve 5, the movement of the quadrant 8 will cause the end of the arm 12 to ride up out of the depression 11 and on to the high part 8 of quadrant 8, which being concentric serves to hold open the throttle during further manipulation of control 19 to close the choke. The configuration of the cam surfaces of the quadrant is such that the throttle will be opened abruptly and to the full extent of the required opening, the amount of this opening depending on the adjustment of screw 15 but being in any event sufiicient to facilitate startingand when the engine is running to remind the operator that the choke is in use.

In the particular embodiment of the in- -vention herein illustrated, the choking physical connectlons as shown or by any other suitable means.

It is also to be understood that the expressions choke and chokin mechanism occurring above and in the ollowing claims are used for convenience sake to denote any means for temporarily increasing the richness of the fuel mixture and not merel the conventional air intake valve herein illustrated and accordingly the arrangement and construction of the parts herein described are subject to. variation without departing from the scope of the following claims.

I claim:

1. In a carburetor, a throttle and choke mechanism interconnected therewith to open the throttle by movement of the choke to enrich the mixture, the interc nnecting means being1 organized to produce a greater degree of t rottle opening when the choke is slightly moved from its inactive position than during the latter part of its said movement, whereby even a partial use of said choke so increases the normal idling speed of an engine as to give appreciable notice to the operator of the enriched condition of the mixture.

2. In a carburetor, a throttle and interconnected choke mechanism organized to effeet a predetermined opening of the throttle upon movement of the choke to enrich the mixture, including means whereby the initial choke movement abruptly produces the whole of said predetermined throttle opening. w y 3. In a carburetor, a throttle and interconnected choke mechanism organized to effect a predetermined opening of the throttle upon adjustment of the choke to enrich the mixture including a throttle actuating member, a movable element of the choke mechanism associated therewith and adapted to operate the same to effect the whole of said predetermined opening by a partial movement of said element.

4. In 'a carburetor, the combination of a throttle, choke mechanism, a cam member havingv an abruptly increasing eccentric surface and a following concentric surface, and a throttle actuating member arranged for successive engagement with said cam surfaces, said cam connected with the choke mechanism for operation coincidently therewith.

In testimony whereof, I have signed this specification.

JOHN GOOD.

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