US2570429A - Gas engine throttle contnrol - Google Patents

Description

Oct. 9, 1951 A. R. COOPER -GAS ENGINE THROTTLE CONTROL Filed June 25, 1947 FIG. 2.

INVENTOR ALLYN R. COOPER ATTORNEYS Patented Oct. 9, 1951 GAS ENGINE THROTTLE CONTROL Allyn R. Cooper, Marshalltownrlowa, assignor of one-half to Harold M. Cooper, Marshalltown,

' Iowa Application June 25, 1947, Serial No, 756,975

8' Claims. (01. 74-501 I. This invention relates to gas engine throttle control, and particularly to the manufacture and assembly of such a throttle control. v

Itis an object ofthe invention to make, an inexpensive throttle-controlwhich is substantially fabricated from punch press stampings.

It is also an object of the invention. to provide a gas engine throttle control whichusesa minimum numb er of partsand: material.

It is a further object of the invention to provide a gas engine throttle control which has a very small. throw onthe operating. end while the handle of the throttle has a long throw which results in permitting the operator to obtain avery fine throttle-adjustment. Y

. It is. anadditional: object or the invention: to provide. a gas engine throttle control in which the: throttle cable wire travels on. a straight line at the location wherein it." enters the throttle control.

It is also an object of the invention to provide proper frictional. pressure to maintain the throttle in. any desired position within: its rangeof movement With-these and other objects inview,the in vention consists in the construction", arrangemen-t-andl combination of= the various parts-of my device whereby the ob'j ectscontemplated are at-- tained, as hereinafter more fully setforth'-,.

pointed. out in the claims and illustrated in accompanying drawings, wherein: 1

Figure 1 is a partial perspective view of the improved throttle control mounted-on the-handle oi a motor driven device; such as a gas engine power lawn mower;

- Figure 2" is an elevational; view of the throttle control. with parts broken: away for" the sake of clearne'ss andwith the dotted lines illustrating one: position oi the parts of the throttle control;

'Fig-ure-3'-is'a sectional-view of the thrott1econ"- trol takenlon line- 3-3 of l i'gure 2i;

Figure 4 is a partial sectional View of the larly to Figure 5, the throttle control which is. generally indicated; by the numeral. comprises: abase plate l3 whichis generally rectangular in l3, and another flat portion 3| at right angles shape and is formed from a fiat sheet metal stamping. The base plate 3* has two aligned ears M bent upwardly therefrom which ears are provided with aligned inverted U -shaped openi'ngs' It; The cars are also provided with cut cuts adjacent the-flat portion of the base plate l3. An extension It is formed on one end" of the base plate l3 and a generally U shaped guide H is bent upwardly from the extension and isin alignment with the apertures F5 in the ears" it. A circular aperture I8 is provided in an" extension of the flat base plate and a flange I! is bent upwardly from the aperture l8. 7

K I'he assembly alsoincludesan extruded'washer 2| having an upturned annular flange 22 bent from the internal portion of the washer.

A plunger 23' is provided", which plunger is generally U-shaped in cross section and! is formed from a sheet metal stamping bent upon itself. The plunger 23 is providedwith a small aperture 24 which extends horizontally throughthe plunger. In addition theplun-ger 23 ispro videdwith a rectangularly shaped cut-out por tion 25- in the bottom thereof.

A cover or cap Z6- is provided and issubstam tially arch shaped- The cap 26 is formed from a sheet metal stamping: and is slightly fiared outwardly prior to assembly. The capZB' is" provided with four feet or projections 21 at the bottomcorners-thereof.

The assembly also includes an anvil or operating member: generally indicate'd" by the numer al 23 The anvil 28 includes a fiat ortion 29' which i's-adapted to lie parallel tothe base plate to theportion' 29", which portion 3=| provides a' gripfor the operator; The anvil 28 also includes a bell crank extension 32'' having a circular extension 33 formed thereon. A relatively large aperture 34 is provided" in the b'ell crank portion 32 of the anvil28.

A spring washer 35, a flat washer 36 and a single headed rivet 31, which may be termed an assembly member, are also includedthe assembly; In addition, athrottle wire- 3'8, having a hook 39 formed thereon and aflexible guide 4| for the throttle wire, which flexible guide is for-med of coiled wire, are provided in the assembly.- Thewanvil. 28,flspring washer 35' and flat washer 36- are all formed of stamped; sheet'metal.

After the parts. are fabricated,- the throttle control is. assembled in the following manner. First, the plunger 23 is insertedthrough the apertures I5 andears |4-. 'I he: extruded Washer- 2| is then placed around the flange IQ of the base plate l3 and the anvil 28 is assembled by placing the aperture 34 around the outer edge of the extruded washer 2| with the extension 33 of the anvil 28 entering the rectangular cut-out of the plunger 23. The relative size of the extension 33 and cut-out 25 are such that the extension 33 'fits snugly and slidably within the aperture 25. The spring washer 3'5 and the flat washer 36 are disposed on the assembly in that order and the rivet 31 is inserted in place. The spring washer fits over the flange 22 of the washer 2|, and the flat washer 36 is adapted to engage the upper edge of flange 22 of washer 2|, as clearly shown in Figure 4. The rivet is then turned over forcing the washer 36 against the upper edge of flange 22 and compressing the spring washer 35 between the fiat washer 36 and the anvil 28.

The cap 26 is then disposed between the ears I H of the base plate I3 and is bent inwardly so that the feet 21 are disposed in the cut-out portion 20 of the ears l4, thus retaining the cap 26 in position. The U-shaped portion ll of extension I6 is then bent into substantially circular form, as shown at 42 in Figures 2 and 3.

This circular form 42 is then tapped the same lead as flexible cable 4|. Cable 4| is secured to |3 by first hooking throttle wire 38 through hole 24 and then shoving the wire 38 through cable 4|, then screwing the cable into the tapped hole of 42 to grip and retain the flexible cable 4|.

The base plate I3 is provided with apertures 43 for the reception of screws 44 for attaching the throtlle control to the handle l2, as shown in Figure 1.

It will be apparent that upward movement of the anvil 28 to the dotted line positions shown in Figures 1 and 2 will cause the extension 33 to move the plunger 23 to the right, as viewed in Figure 2, thereby moving the throttle control wire 38 to the right to either open or close the throttle. Downward movement of the anvil 28, from the dotted line position shown in Figures 1 and 2, will cause the extension 33 to move the plunger 23 to the left, as viewed in Figure 2., and,

therefore, move the throttle control wire 38 to the left. The spring washer 35 provides sufficient frictional resistance to the movement of the anvil 28 that it will remain in any position desired. Furthermore, it will be noted that the handle portion 3| of the anvil 28 is moved through a relatively large are compared with the movement of the extension 33, thus permitting the operator to attain very fine adjustment of the throttle. ible guide 4|, which is retained in the circular member 42, assures that the throttle wire 38 is always in substantial alignment with the plunger 23 at the location where the throttle wire 38 is attached to the throttle control assembly.

From the foregoing it will be apparent that I have provided a very inexpensive throttle control device which is made substantially entirely of punch press stamp-ings and which, therefore, has a minimum number of parts and uses. the minimum of material. While I have shown the throttle control as applied to a handle of a lawn mower, it is obvious that the invention is not limited to such a use.

Some changes may be made in the construction and arrangement of the parts of my device without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may It is also pointed out that the flexbe reasonably included within their scope without sacrificing any of the advantages thereof.

I claim as my invention:

1. A throttle control device comprising a base plate, a plunger slidably mounted in the base plate, an operating member for the plunger and a cap mounted on said base plate and spaced from said plunger adapted to enclose a major portion of the plunger.

2. A throttle control device comprising a base plate, a plunger slidably mounted in the base plate, an operating member for the plunger and a cap mounted on said base plate and spaced from said plunger adapted to enclose a major portion of the plunger, all of said parts being formed from sheet metal stampings.

3. A throttle control device comprising a sheet metal base plate, a plunger slidably mounted on the base plate, an operating member for the plunger, a plurality of guide members on said base plate for the plunger and bent at right angles from the material of the base plate, means on said operating member and said plunger 00- operating to afford arcuate movement of said operating member and lineal movement of said plunger and a throttle control wire secured to said plunger.

4. A throttle control device comprising a base plate, a plunger slidably mounted with respect to said base plate, guide means on said base plate restricting movement of said plunger to a reciprocal motion parallel to the base plate, a movable operating member cooperating with said plunger to reciprocate said plunger, said operating member and said guide means cooperating to retain said plunger on said base plate, a single pin for retaining the operating member and the base plate together, and spring means concentric with said pin for imparting frictional resistance to movement of the operating member with respect to the base plate.

5. A throttle control device comprising a base plate, a plunger slidably mounted with respect to said base plate, a movable operating member for the plunger, a circular flange on said base plate, said operating member having a hole therein through which said circular flange extends to provide for pivoting of said operating member with respect to said base plate, a spring washer in register with said flange, and a single assembly member for retaining said base plate, said operating member and said spring washer in operative relation.

6. A throttle control device comprising a base plate, a plunger slidably mounted with respect to said base plate, a movable operating member for the plunger, a circular flange on said base plate, said operating member having a hole therein through which said circular flange extends to provide for pivoting of said operating member with respect to said base plate, a spring washer in register with said flange, the extended end of said circular flange being spaced from the base plate a predetermined amount, a member adapted to compress the spring washer, and said member engaging the extended end of the circular flange, whereby the amount of compression of the spring washer is limited.

'7. A throttle control device comprising a base plate, a plunger slidably mounted with respect to said base plate, a, movable operating member for the plunger, a circular flange on said base. plate, said operating member having a hole therein through which said circular flange extends to provide for pivoting of said operating member with respect to said base plate, a spring washer in register with said flange, the extended end of said circular flange being spaced from the base plate a predetermined amount, a washer adapted to compress the spring washer, said washer engaging the extended end of the circular flange, whereby the amount of compression of the spring washer is limited, and a single assembly member for retaining said base plate, said operating member and said washers in operative relation.

8. A throttle control device comprising a base plate, a plunger slidably mounted with respect to said base plate, a movable operating member for the plunger, a circular flange on said base plate, said operating member having a hole therein through which said circular flange extends to provide for pivoting of said operating member with respect to said base plate, a spring washer in register with said flange, the extended end of said circular flange being spaced from the; base plate a predetermined amount, a member adapted to compress the spring washer, and said member engaging the extended end of the circular flange. whereby the amount of compression of the spring washer is limited, and means for retaining said last member, said base plate, said operating ALLYN R. COOPER.

REFERENCES CI TED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,260,465 Shakespeare et a1. Mar. 26, 1918 1,480,924 Wood Jan. 15, 1924 1,489,482 Bush Apr. 8, 1924 1,598,032 Williams Aug. 31, 1926 1,700,643 Nordell Jan. 29, 1929 1,736,330 Schmidt Nov. 19, 1929 1,782,035 Gianera Nov. 18, 1930 2,136,652 Hart Nov. 15, 1938 2,320,567 Carlson June 1, 1943 FOREIGN PATENTS Number Country Date 853,023 France Nov. 18, 1939 201,043 Great Britain July 26, 1923 274,644 Great Britain July 28, 1927

Images