US2460420A - Starter mechanism for motors - Google Patents

Description

Feb. 1, 1949. L. 'r. KINCANNON STARTER MECHANISM FOR MOTORS Original Filed April 14. 1943 IN VEN TOR. 67. g 6

Patented Feb. 1,1949

STARTER MECHANISM FOR MOTORS Leo T. Kincannon, Milwaukee, Wis., assignor to Metal Products Corporation, a corporation of Wisconsin Original application April 14, 1943, Serial No.

Divided and this application August- 25, 1944, Serial No. 551,198

' 6 Claims. (Cl. 12 3-185) I The invention relates to starters for small motors. I

This application is a division of my copending application Serial No. 482,967, filed April 14, 1943, and relates more particularly to the starter mechanism shown, described, and claimed in said application, and the general object of this inven- 2 to permit the cams I10 to act on the plate, a spring I65 (Fig. 2) embraces the upper end of the diameter I6I and has a free end receivable in a slot I66 in the bearing. The spring I65 acts tion is to providaa starter mechanism which will be less likely to fail and which can be readily and economically manufactured.

One object of the invention is to provide a starter mechanism which eliminates the use of the usual separate ratchet dogs and their springs and provides a simple automatically releasable clutch plate to connect the starter impulse mechanism to the engine shaft.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings:

Fig. 1 is an enlarged elevational view, partly in cross-section, showing the starter mechanism;

Fig. 2 is a detailed horizontal cross-sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a'vertical cross-sectional view taken on the line 3-3 of Fig. 1.

In the drawings, the numeral 23 designates generally the starter mechanism, 20 the motor shaft, and I08 the fly-wheel fixed on the shaft 20 and rotatable therewith.

The starter mechanism includes an impulse or torque producing mechanism and an automatic clutch mechanism for connecting said torque producing mechanism to the engine shaft 20 to turn the same to start the motor.

The clutch mechanism includes a fixed jaw clutch member or the plate I50 which is fixed to the flywheel I08 by screws II. The plate I50 has a plurality of circumferential apertures I52 which are engaged by depending lugs or jaws I53 on an actuator or fixed jaw clutch plate I54. The plate I54 is mounted on a hub or shaft I56 in the top of the fixed casing I51.

The hub I56 which is concentric with the shaft 20 has a larger diameter I50 which has a working fit in the upper part of a bearing I60 and a as a drag in one direction which permits the plate I54 to move down under the influence of the cam surface I10 while allowing the plate I54 to rotate freely in the opposite direction. The spring I65 as shown in Figs. 1 and 2 cooperates with the part I6I .of the shaft I56 to form a one-way or overrunning brake. The pulley I'II has a hub I13 which is mounted to rotate about the hearing I in the top of the casing I51 and is urged into retracted position by a spring I13. The pulley is turned or operated by a rope or cord I15, one end of which projects through an opening I51 and is maintained outside the casing.

To start the motor the carburetor (not shown) flooded in the usual manner and the cord I15 pulled to rotate the pulley. Rotation of the pulley Ill brings the cam surfaces on the fingers I10 into engagement with the top of the actuator plate I54 forcing said plate downwardly into engagement with the plate I50, it being noted from Fig. 3 that the fingers I10 project through openings I54 in said plate I54 and act as wedges. Downward movement of the actuator plate I54 brings its lugs I53 into engagement with one side of the holes I52 and further rotation of the pulley I1I rotates the shaft 20, causing the engine or motor, not shown in detail herein, to become filled with explosive mixture which is compressed and fired as usual to start the engine rotating under its own power.

When the motor starts, the rotation of the plate I50 relative to the plate I54 is reversed and the trailing edges of the apertures I52 in the plate I50 contact cam surfaces I53 on the trailing edges of the lugs I53 to force the plate I54 free of the plate I50 and other rotating parts of the engine. The spring I63 also acts to normally urge the plate I54 to a disengagingposition, so that in case the cord I15 has been pulled out to its full extent before the motor starts or the motor fails to start, the plate I54 will be disengaged from the plate I50 and the spring I13 will be free to turn the pulley "I back to a starting position.

It will be noted that the cord operated pulley "I with its fingers I10 provides a torque producing mechanism which acts to move the clutch plate I54 into engagement with the clutch plate I50 on the motor and whicha'is returned to its initial starting position by the spring I13. The

drag produced by the spring I65 acts only in one direction, that is, while the pulley m is being turned to turn the motor, but releases when the motor starts to allow the plate I54 to be turned freely in the opposite direction as the plate 554 is moved upwardly by the spring I63 out of engagement with plate I50.

It will be noted that the flywheel I08 itself is provided with apertures in line with the apertures in the plate I50 and that the plate simply forms a wear surface for the tops of the apertures in said flywheel.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the claims.

What I claim as my invention is:

1. In a starter for a motor having a flywheel with apertures therein, a pulley, a spring attached to said pulley and adapted to rotate the pulley in one direction, a cord engaged with said pulley and adapted to rotate the pulley against the action of said spring, an actuating plate mounted concentrically with said pulley and having a limited movement in a plane perpendicular to the pulley, a cam member mounted on said pulley and in constant engagement with said plate, said cam being adapted simultaneously to rotate said plate and having fixed cam portions engageable with said plate to move the same toward said flywheel, and fixed lugs on said plate engageable in the apertures in the flywheel to rotate the latter.

2. In a starter for a motor having a flywheel with an aperture in the upper end thereof, said starter comprising a pulley, a cord wound about said pulley and adapted to rotate the same, an actuator plate movable axially toward the flywheel, a fixed lug on said actuator plate engageable with the aperture in the flywheel to rotate the same, and cam means on the pulley simultaneously to rotate the actuator plate and cause the same to move toward the flywheel and actuate the motor.

for connecting said member with said shaft including a fixed jaw clutch member having lugs forming relatively fixed jaws and movable with said revoluble member, means for imposing a drag on the rotation of said clutch member in one direction to produce relative movement between said members, cam means on said revoluble releasable therefrom on reverse rotation of said 3. In a starter mechanism of the character described, the combination with a manually revoluble member and an engine shaft, of a clutch for connecting said member with said shaft including a fixed jaw clutch member having lugs forming relatively fixed jaws and movable with said revoluble member and lengthwise relative thereto and a fixed jaw clutch member on said shaft provided with lug engaging recesses and having a driving connection with said lengthwise movable clutch member but releasable therefrom on reverse rotation of said shaft and cam means on said manually revoluble member to simultaneously rotate said first named clutch memberand cause the same to move toward the second named clutch member.

4. In a starter mechanism of the character described, the combination with a manually rev- 7 oluble member and an engine shaft, of a clutch shaft.

5. In a starter mechanism of the character described, the combination with a manually revoluble member and an engine shaft, of a clutch for connecting said member with said shaft including a fixed jaw clutch member having lugs forming relatively fixed jaws and movable with said revoluble member, means for imposing a drag on the rotation of said clutch member in one direction toproduce relative movement between said members, cam means on said revoluble member acting on said clutch member to move it lengthwise relative thereto, a fixed jaw clutch member on said shaft provided with lug engaging recesses, said clutch members having a direct drive connection with each other in one direction, and a wedge connection in the opposite direction to automatically release said lengthwise movable clutch member.

6. In a startermechanism of the character described, the combination with a manually revoluble member and an engine shaft, of a clutch for connecting said member with said shaft including a fixed jaw clutch member having lugs forming relatively fixed jaws movable with said revoluble member, a one way overrunning spring brake for imposing a drag on the rotation of said clutch member in one direction to produce relative movement between said members, cam means on said revoluble member acting on said clutch member "to move it lengthwise relative thereto, and a fixed jaw clutch member on said shaft provided with lug receiving recesses and having a driving connection with said lengthwise movable clutch member but releasable therefrom on reverse rotation of said shaft.

LEO T. KIN CANNON REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,178,788 Filletaz Apr..11, 1916 2,204,750 Conover June 18, 1940 2,227,392 Kuzmitz Dec. 31, 1940

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