US1821576A - Control device - Google Patents

Description

Patented Sept. l, 1931 vPATENT orr'lcr.N

Rossrrn n. :POTTER AND MONROE srrAxEsPEABE, oF KALAfMAzoo, MICHIGAN,

ASSIGNORS T SAKESPEARE PRODUCTS COMIANY, OFIKLAMAIZOO, MZICIBIIGAII' y I coN'rRoL DEVICE y .Application mea october 15, 1927. serial No. 226,428;

The main object of this invention is to provide an improved control device for choke valves ofcarburetors.

A further object is to provide an improved j control mechanism of this class which is very simple and economical in its parts.

Objects Ipertaining to details and economies of our invention will appear from the description to follow. The invention is delo ned in the claims. A structure-which is a preferred embodi- `ment of our invention ,is illustrated in the accompanying drawings, in which: 1;.

Fig. 1 is a fragmentary side elevation of our improved control device in operative relation to a carburetor-and mounted upon the part representing an instrument board of a -motor vehicle.

Fig. 2 is a detail view 2o tudinal section on line 2-2 of Fig. 5. p

Fig. 3 is a fragmentary'side view with the control member extended, one position being indicated by dotted lines.

Fig. 4 is an enlarged detail section illustrating the manner of securing the support to the rod housing.

Fig. 5 is 'a cross section on line 5-5 vot ig. 6 is a detail-view partially 1n longi tudinal section showing a modified form or embodiment of our invention.

Fig. 7 is adetail view partially in longitudinal section showing another modification of our improvements.

Referring to the drawings, 1 represents a carburetor. provided with achoke valve actuating lever 2 which is returned to its normal or open position by the spring 3. l

4 represents the. instrument 'board of'a motor vehicle. i

The control rod 5 which is normally formed of wire is arranged through a supporting tube or housing 6, the arrangement being commonly designated as a Bowden tube. The upperl end of this tube 6 is arranged within and'secl'ired to thebarrel-like support 7 preferably by clamping or upsetting the end 8 of the support thereonsee Fig. 4.

The support 7 in, that is, it has a bore with the outer porpartially in longi#4 has a shouldered bore there-4 tion 9 of a larger diameter thanthe inner portion 10. This support is externally threaded at 11 and has a head 12atits outer,- end constituting a nish member and engaging the inner side, a clamping nut 13 engaging the inner side ofthe instrument board.

The controlrod is provided with a headpiece 14 having a linger piece 15 at itsouter end'. The rod is secured to the inner end of this headpiece.` The headpiece has an annular groove 16 to receive'ithe U- shaped or split spring 1-7 which frictinally engages the walls of the smaller diameter of the bore. The friction of the spring 17 with the walls of smaller diameter ofthe bore is such as to hold l'the headpie'ce against the return action of the spring 3, the spring 3, however, returning'the partsto the position in which the friction spring engages the reduced walls of the bore so that if the choke be fully closed, that is, the headpiece pulled out its full length and then released, the spring -3 will return the parts to lretarding position, the

choke then beingonly partially opened. v This permits the choke being fully closed to start a motor vehicle and the vehicle may be run.

-with the choke partially closed until the' ven-4 gine is suiliciently warmed to run on the normal supply of gasoline, the choke being completely opened by manually returning the heacpiece.

Iii Fig. 7 thefube 18 is a sona wan tube as distinguished from the tube formed of coiled wire illustrated'intheother figures,

andthe support member 19 is clamped .upon

the iiared end 2O of the tube 18'. In this em- --bodiment the control rod 21A has a kink or voi'set 22 therein bringing it into frictional spring on the headpiece 23.

In the modification shown in Fig. 6, the-I friction spring 24 is mounted in the barrel whichl has an enlargement25 in its boreto receive the spring, the end 26of the barrel being spun down to retain the spring. lThe headpiece 27, in this embodiment, has a reduced portion 28 at its inner end which moves freely Within the spring, the spring, however, coacting with the largerportion 29 to hold the headpiece With the choke in par-A tially openl position. l.

` We have illustrated and described our improvements in embodiments Which We have found very practical. We have not attempted to illustrate or describe certain other l modifications and adaptations Which We contemplate as we believe the disclosure made will enable those skilled in the art to embody or 'adapt our improvements as may be desired;

Having thus described ourainvention, what We claim as new and desire to secure by Letters Patent, is: A l. In a control mechanism, the combina-4 tion with the controlled member provided with a return spring, of a control rod connectedthereto and' provided with a cylindrical headpiece, asbarrel-like support 1n which said headpiece is reciprocatingly -mounted, said support having a stepped bore with its larger diameter at the outer end of the support, said headpiece having an annular groove adjacent its inner end, and a split springmounted in said groove to frictionallyengage the'walls ofthe smaller diameter 'of said bore but moving freely in the larger diameter thereof.

2. A control device comprlsing a control `our hands.

7. In a carburetor choke control, the com bination with an element designed to he connectedto the chokevalve, of instrumentalities permitting said valve to be fully closed and thereafter to be automatically partly opened, the said instrumentalities comprising a housing providing two ranges of movement for said element, a spring for automatically moving said element through one of `its ranges when the vsaid element is in its fully closed position, and means for frictionally holding said element in any position to which it is manually shifted in its other range.

'In Witness whereof we have hereunto set ROSSITER a. POTTER. MONROE sHAKEsPEARE-- l rod provided With a cylindrical headpiece,

a barrel-li ke support in Which said headpiece is reciprocatingly mounted, saidsupport having a stepped bore'with its larger diameter at the outer end of the support, said .headpiece having an anular groove adj acentv its inner i end, and a U-sli'aped spring mounted in said groove to frictionally' engage the walls of the smaller diameter of said bore but moving freely in the larger diameter thereof.`

3. A control deviceV comprising-a barrellike support having a stepped bore, the largerl s diameter of the .bore being at the outer end of the support, a headpiece reciprocatingly mounted in said support providedwith a finger piece at its outer endand having an annular groove adjacent its inner end, and a Split spring mounted in said groove to fric- 4 tionally engage the Walls of the smaller diameter of the bore of the barrel-like support but to vmovelfreely in the larger Vdiameter thereof.

4. A controlY device comprising a support having a stepped bore, a headpiece reciprocatingly mounted in said supportl and having a groove therein, and a spring mounted in said groove to frictionally'engage the Walls of the smaller diameter of said bore.

5. A control'devicecomprising a barrellike support member having a stepped bore,

a headpiece reciprocatingly mounted in said support, a return spring operatively associated with saidv headpiece and a friction means'mounted 1n one of sadnembers to

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