US1674176A

US1674176A - Safety timer governor

Info

Publication number: US1674176A
Application number: US636051A
Authority: US
Inventors: Edward C Newton
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-05-02
Filing date: 1923-05-02
Publication date: 1928-06-19
Anticipated expiration: 1945-06-19

Description

Patented June 19, 1928.

star EDWARD o, NEWTQN, or os AnsnLns, cn nrronnrn,

snrncrx TIMER eovEnnon.

Application filed May' 2, 1923. Serial no. 636,051.

My invention relates to a governor mechanism which is especially applicable for use in automatically advancing or retarding the timing of'the ignition spark in internal combustion engine operations.

An object of my invention is to provide governor mechanism embodying instrumentalities adapted, on being rotated, to move under the action of centrifugal force,

10, said governor mechanism being so constructed and arranged that when the speed of rotation reaches a predetermined rate the centrifugal force will be diminished and resist ance to centrifugal force augmented relative 1 to increase in the speed of rotation, whereby a very sensitive action will be effected at both high and low speeds.

An object of my invention is to provide a governor mechanism with speed responsive elements which operate under the action of centrifugal force to produce anormal governing action at a normal speed of rotation, and to produce a graded governing action, at and beyond a predetermined speed, proportional with the speed. i

With the foregoing objects in View, to,- gether with such other objects and advantages as may subsequently appear, my invention resides in the parts and in the combination, construction and arrangement of parts hereinafter described and claimed;

The invention is illustrated in the accompanying drawings, in which Figure 1 is a plan view of the rotary ele mentshowing the operating parts thereon in normal position.

Figure 2 is a similar view with the operating parts in a partly advanced position.

Figure 3 is a similarview with the operating parts in their maximum advanced position.

Figure 4 is a view in cross section partly in elevation, showing the device as assembled. V

Fig. 5 is a perspective view of the supportmg element for the centrifugally actuated parts. More specifically, 14 indicates a timer shaft which is adapted-to be rotated in the usual manner from the crank shaft on an internal combustion engine.

In carrying out my invention I employ a centrifugal governor for opening and closing the ignition circuit at various moments relati e to the posit-ion of the engine pisten and to the engine speed, which governor is here shown as embodying a rotary element 24 fixed on the timershaft 14. The rotary element-includes a sleeve 25 which is, rigidly secured to the timer shaft in any desired manner, Formed onthe sleeve is a bracket 26 on which is mounted a weighted arm 27 pivoted at 28 on'the bracket at a point eccentric to the axis of rotation of the rotary element, which arm is adapted to be moved outwardly under the action of centrifugal force.

A second bracket 29 is formed on the sleeve '25 and pivoted at 30 thereonis a weighted lever 31, which isadapted to swing outwardly under the action of centrifugal force o'nrotationof the rotary arm. The weighted-lever 31 is designed to have limited outward movement, for which purpose it is formed with aj' shoulder 32 which is adapted to abut against the bracket 29 when the'lever is in its outermost position, as shown in Figures 2 and 3, which shoulder is normally spaced from the bracket 29 as shown in Figure 1. A spring 33 connecting with the bracket-29 engages the inner end port-ion of the lever as indicatedat 34c and acts to -yie'ldably oppose movementof the lever under the action of centrifugal force and serves torestore the lever to normal. A second spring 35 extends between the outer end of the'we-ighted arm 27 and the inner end portion of" the weighted lever 31 which spring yieldably opposes outward movement of the weighted arm under the action of centrifugal force and also acts to restore the arm to itsv normal innermost po sition. Theouterend'of the arm 27 is formed with an inclined face 36 and the inner end portion of the weighted lever 81 is formed with a projection '37 which normally bears against the inclined face 36 ad jacent the upper portion thereof in such fashion that-the movement of the weighted lever under the action of centrifu'ga lforce will cause the projection "37 to move downwardly on the inclined plane 36 and thereby exert a pressure on the outer end of the arm I 27 tendingto rock the latter outwardly.

It will now be seen that on rotation of the rotary element in the direction of-the arrow A i-n Figure 1, the weighted arm 27 and weighted lever 31 will be caused to rock outwardly in opposite directions under the 7 action of centrifu alforce and that h son of the leverage effected by the weighted lever on the arm 27, together with the action ofcentrifugal force on the arm 27, the initial outward movement of the arm 27 will be accelerated until the weighted lever is thrown out of operative relation to the weighted arm by moving against the stop afforded by the bracket 29, as shown in Figure 2. The weighted arm is designed to have a continued outward movement under action of centrifugal force after the action of the weighted lever thereon has terminated; the weighted arm then moving outwardly under the action of centrifugal force in opposition to the spring which movement is limited by a stop .38 formedon the bracket 36.v

By this construction the arm 27 and lever 31 constituting the weighted elements ofthe centrifugal governor will each swing outwardly under the action of centrifugal force at low speed with their outward movement progressing indirect ratio to the increase inspeed of rotation and the consequent increase in centrifugal force, until thespeed of rotation and the resultant centrifugal force is such as to cause the lever 31 to come to rest, whereupon the action of thelever 31 in assisting outward movement of the arm 27 through themedium of the projection 37 on the lever riding over the inclined face 36 on the arm, will be terminated. The force exerted by the ac tion of centrifugal force on the lever 31 being thus arrested when the speed of rota- I tion reaches a predetermined point there will be a diminution of centrifugal force acting on the arm 27 when the speed ofrotation reaches a predetermined point and there will he an increased resistance to the movement of the arm 27 under the action of centrifugalforce on further increase in speed above the predetermined point by reason of the action of the spring 35 on the arm 27. It accordingly follows that thearm 27 will initially move outwardly in direct proportion to increase in speed of rotation up to a predetermined point at a constant ratio and thereafter will move at a lesser ratio at increasing speeds above the predetermined rate of speed.

-Mounted on the outer portion of the weighted arm 27 is a contact member 39, here shown in the form'of a-wiper contact member, arranged to traverse a'series of con-v tact plates 40. carriedon the inner face of the end wall of a shell or housing 41 extending over and encircling the rotary element.

It willbe noted by referring to Figures 1, 2 and 3 that the wiper contact member 39 will be caused, on swinging movement of the arm 27, to'mov'e outwardly and inwardly relative to the axis of rotation of the rotary element so that it will traverse various circular paths of travel within the range of movement of the outer portion of the weighted arm.

By reason of the wipercontact'member being carried on a pivoted arm it will also be caused to move on an arc and to be ad vanced or retracted along the lines of its circular paths of travel and relative to a plane extending through the axis of rotation of the rotary element. V

The'wiper is thus caused to advance relative to its forward movement as the speed ofthe rotary element increases, and is caused to retract relative to its forward movement as the speed of the rotary element decreases.

It follows that as the wiper is advanced and retracted under the action of varying speeds, the movement of its meeting with the contact plates and the consequent closing of the circuit will vary, thus advancing or retarding the moment of sparkingat the spark plug and accordingly varyin the moment of ignition of the explosivec arge in the engine cylinder relative to the position of the engine piston, as will be more fully explained hereinafter.

It will be understood that fluctuations in engine speed in the range from low to high and arrangement shown, but may employ such changes and modifications as come within the scope of the appended claims, it being obvious that, in adapting the device to meet varying conditions within the range of advance and retardation of the sparking moment desired, the degrees of movement of the wiper will be varied to meet the require ments.

I claim 1. In a device of the character described,

a rotary element, a weighted arm, a weighted lever, said arm and lever bein pivoted on said element and operable to ac vance collectively under the action of centrifugal force up to a predetermined speed of rotation of said element, a yieldable connection between said arm and lever, an inclined plane on said arm, a projection on said lever operable on said inclined plane to advance said arm relatively to said lever in oppositionto said yieldable connection, and means whereby said arm will be caused to advance independent of said lever.

2. In a device of the character described, arm and lever, means for limiting outward a rotary element, an arm pivoted on said movement of the arm, and means for limiting element, a lever pivoted on said element, said outward movement of said leverg'said last 10 arm and lever being arranged to swing outnamed means being arranged to arrest out- 5 wardly in opposite directions under the acward movement of the lever before outward tion of centrifugal force, means for yield movement of said arm is arrested. ably opposing outward movement of said 7 EDWARD G. NEWTON.