US1707763A - Choke control - Google Patents

Description

April 2, 1929. w. J. LINN 7,

CHOKE CONTROL Filed Oct. 31, 1924 I .VE 'OR& v If Patented Apr. 2, 1929.

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The present invention relates broadly" to means adapted to assist in maintaining a carbureter choke in such position as to aflord enrichment of the mixture supplied to an automotive engine. More particularl ,the invention is to provide a device 9 this character adapted for use on automobiles of the type in which the choke control quite frequently extends through the dash wall to one side of the operator whereby it is not any too readily accessible, or in which no means is provided for holding the control even temporarily in the position to which it may be moved by the operator.

At the present time it is possible to purchase on the market diflerent forms of friction grips adapted to be used in conjunction with choke controls. These grips have ordinarily,- howev'er, required accurate positioning and the drilling of one or moreholes through the dash to permit their attachment. Also, they have been so constructed as to exert an unnecessarily large amount of friction on the control, thereby not only making the initial operation of the choke more difficult, but requiring a positive act on the part of the operator in moving the choke to its normal position.

It is well recognized in the art to which e present invention relates that the full choke effect is necessary only for a comparatively brief period in starting. If the full choke effect is continued there is a tendency for the carburetor to flood. It is also generally desirable to gradually decrease the choke effect as the engine temperature increases. I

It is one of the objects of the present invention to provide a choke control that can be easily and quickly applied, and which does not require any preliminary positioning or hole drilling.

A further object of the invention is to provide a control grip of the character re ferred to of such construction that it will automatically insure a slight movement of the choke control from its fully applied position toward an intermediate position, and one in which continued operation of the motor to which the grip is applied will permit the control to gradually return to its normal position without attention by the operator.

In the accompanying drawings, there are shown, for purposes of illustration only, certain preferred embodiments of the invention, it being understood that the drawings do not define the limits of the invention, as changes in the construction and o ration disclosedt-herein may take place wi out doparting from t e s irit of the present invention or the scope o my broader claims.

In the drawings:

Figure 1 is aside elevation of a choke control in position on a car,- With my improved control grip in operative position:

, Figure 2 is a perspective View of one ens bodiment of the control grip; and

Figure 3 is a transverse sectional View through a slightly different embodiment of thepresent invention.

ith certain forms of standard installation, the choke control comprises asnbstantially vertically extending rod 2 leading at its lower end to suitable connections for control ling the air shutter or choke valve and at its upper end connected to one arm of a bell crank lever 3. This level isvpivoted at an intermediate point to a bracket 4 which is normally secured in position by fastenin means 5. The other arm 6 of the bell cra'rn lever extends upwardly and has connected thereto apull rod 7 which passes through the rear motor partition 8- and the dastr il'i The forward end of the pull rod is provided with a knob or other suitable means 10 by reason of which the operation of the control is facilitated.

From a practical standpoint it is desirable where attachments are provided to have them so constmefedthat they may be Mdi-lp applied,- pteferably' wanna the drilling 0 any additional The re ent core trol griph embodies thqse (iqsi-rable chaimr istics, t e gri era com risin a length ofi wire? rd d or oth er mat ri'al ent upon itselfi to provide substantially paralllelly extending gripping arms l1 and a fastening eye 12. This eye is of such site as to receive one of the fastening means 5 for the bracket 4, whereb it is posm'rble to instal the grip by more y removing one of the bolts or fastening means and assing it through the fastening eye. Pre erably, the grip will be provided with a fastening means exactly as shown in Figure 2 of the drawings, whereby in the event of loss or destruction of one of the fastening means normally provided for the bracket 4: t ere will be no difficulty in attaching the grip.

The gripping arms 11 are of such length that they will project upwardly to a point beyond that at which the pull rod 7 passes through the rear motor partition 8. In installing the grip, these arms are spread to an extent to permit the pull rod to pass therebetween, whereby the resiliency of the arms and their tendency to return to their normal position exerts a gripping action on the pull rod. The site of the grip and the character of the material is preferably such that the frictional gripping action thereof will not be great enough to positively hold the choke control in any definite position when the vehicle to which it is attached is running. lVith such a construction thevibration afforded by operation of the vehicle tends to gradually release the choke control and permit it to return toward its fully off position. This highly desirable, as the requirement for a choke becomes less as the motor becomes hotter. The present grip, therefore, automaticallyoperates to produce advantageous results.

'It is also well recognized in the art that it is unnecessary to utilize the full choke effect for more than a brief instant. WVith the present construction, the grip acts to throw the choke control from its fully applied position toward an intermediate position. This'operation' is accomplished by reason of the fact that the lever arm 6 during operation moves in the arc of a circle A. After the arm 6 passes a position during its movement toward the partition 8 in which it is normal to the axis of the pull rod 7, the upper end tends to swing downwardly. This draws the pull rod further toward the fastening eye 12 and separates the gripping arms 11 to a greater extent. This throws an additional strain onto the grip and the resulting tendency is for the-arms to return even more quickly toward their original position. The upward thrust exerted by the closing tendency of the arms, due to the angularity of the pull rod 7 and the character of the bell crank lever,'is effective for returning the choke control to some extent toward its normal position.

In operation, the driver of the vehicle pulls the choke completely out and holds it until he has stepped on the starting button.

Thereafter, merely releasing the pull rod permits it to return toward an intermediate position, whereupon continued operation of the vehicle Wlll be effective for 'raduall' returning the choke control toward its completel off position.

In igure 3, there is illustrated a slightly modified form of construction, indicating the possibility of providing the gripping arms 11 with serrations or roughened gripping surfaces 13, whereby the amount of grip exerted by the arms may be effectively varied. c i

The advantages of the presentinvention arise from the provision of a control grip crank lever-carried thereby with a pull rod connected to one of the lever arms, of a grip provided with fastening means common to said bracket and having parallelly extending gripping arms adapted to embrace the pull rod, substantially as described. 7

As an articlc of manufacture, a choke grip comprising a body of elongated material bent upon itself-to form an eye and substantially parallelly extending arms terminating at a point remote from the eye, said arms having serrated gripping surfaces, substantially as described. i

3. The combination with a choke control rod movable longitudinally and also having aslight vertical movement between limits, of a grip therefor comprising a pair of arms yieldably movable away from each other and between which saidrod is passed and which are spread apart by the rod, said arms being spread to a greater extent by the rod when it is at one limit of its vertical movement than when it is at the other limit thereof.

t. The combination with a reciprocable choke control rod movable from a full choke to a full open position, of a grip therefor comprising a pair of arms yieldably movable away from each other and between which the rod extends and which are spread apart by the rod, said rodspreading the arms to a greater extent in the full choke position of a rod than in the full open position thereof;

In testimony whereof I have hereunto set my hand.

WILLIAM J. LINN.

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