US1960874A - Reciprocating motion engine stop - Google Patents

Description

May 29, 1934. F. HENNEBUHLE RECIPROCATING MOTION ENGINE STOP Filed-Jan. 23, 19:53

Frank Hennebbhle Patented May 29, 1934 UNITED STATES PATENT QEEICE My invention relates to mechanisms having for their purpose, the automatic stopping of an engine should it race or should, from any cause,

,its speed be increased above a predetermined amount.

The present invention has for an object to provide a power operated means, normally latched against action, which when released will close the engine throttle by tripping its valve, if it be a steam engine, or by opening the ignition circuit if it be a gas engine; and to provide a device which is moved through a constant are by a reciprocating part of the engine,

which device has provisions to release the latch as soon as the speed of the engine has passed the maximum speed for which the invention has been set.

Further, it is an object to provide an overspeed governor whose tripping element is inactive at all speeds below a certain definite speed for which it has been set, and to provide means whereby said tripping element may be set to operate at any speed desired, within the range for which the governor has been designed.

Further, it is an object to provide an apparatus of the kind above referred to which is quiet, positive in its operation and very sensitive in its action, and one whose parts will have but little wear, are easily replaceable and one which can be manufacturedand installed at very little expense.

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends, the invention still further resides in the novel details of construction, combination and arrangement of parts, all of which will be first fully described in the following detailed description, then be particularly pointed out in the appended claims, reference being had to the accompanying drawing, in which:

Figure 1 is an elevation showing my invention applied to a steam engine.

Figure 2 is a detail, inverted plan view of the jmeans for attaching the governor rod to the valve rod of the engine.

Figure 3 is an enlarged detail view of a portion of the governor, parts being shown in section.

Figure 4 is a detail view of a part of the governor connected to operate a switch for an electric circuit (such as the ignition circuit of a gas engine, for example.)

In the drawing in which like numbers and lletters of reference indicate like parts in all the figures, 1 represents a combined throttle and trip valve such as that disclosed in my application filed May 18, 1931, Serial No. 538,375, and 2 indicates the trip lever thereof which when actuated frees the valve 1 so that it will auto matically close.

The conventional steam chest 3 of the engine 4 encloses the usual slide valve whose rod 5 is actuated in the usual way to reciprocate in strokes of definite and regular lengths.

To this rod 5, or any other suitable reciprocating part of the engine, I secure a clamp 6 carrying a stud 7 to which the end 8 of the governor-connecting rod 9 is pivoted.

The governor comprises a support 10 on which is pivoted, at 12, an arm 11 that is rocked through a constant are by having the rod 9 pivoted to it at 13. The arm 11 is slotted as at 11 in order that the pivot 13 may be adjusted up or down to accord with the stroke of the particular engine with which the governor is being used.

The free end of the arm 11 has a cylinder 14 with an internal flange that divides it into two sections, one to receive the head 16 of a hammer Whose rod or shank passes through the flange 15 and projects beyond the end or" the cylinder. The rod 1'7 is threaded and receives an adjusting wheel 18 whose hub. 19 is slidably and rotatably mounted in the cylinder 14 (the head 16 being slidably but not rotatably mounted in the cylinder 14) so that the hammer-parts 1617-18 may move along the axis of the cylinder 14 as a unit, and the wheel 18 may be adjusted along the rod 17 to increaseor diminish the tension of a regulating spring 20 located in the cylinder 14 between the flange 15 and hub 19. The wheel 18 is held to its adjustment by a jam nut 17*.

The tension of the spring 20 is so adjusted that at all speeds of oscillation of the arm 11 below a predetermined speed there will be no movement between unit 16, 17,- 18 and cylinder 14, but as soon as the speed has passed that for which the governor has been set the tension of the spring 16 will be overcome by the oscillating force and hammer unit will move to the dotted line position shown in Figure 3 which will be slight but enough to engage a latch 26 and move it out of engagement with the stop 29, thereby permitting spring 105 the case may be). The latchs pivot 27 is located so that gravity will always tend to cause finger 28 to engage stop 29.

The stroke of the arm 11 is so designed that with latch 26 engaging stop 29 head 16 (normally against flange 15 at speeds below the critical overspeed) will just clear latch 26 so that only a very slight advancement of 16 is necessary to cause it to disengage latch 26 from. stop 29, thereby providing a very sensitive piece of apparatus.

The fact that the parts 11, 14., 15, 16, 1'7, 18, 19 and 20 move as a unit (and have no movement relatively to each other) at all speeds below the critical over-speed reduces wear to a minimum, as the only moving parts where wear can occur while under normal operation are the pivots 12, 13, and 7, all other parts being at rest. This gives long life to the parts since 12, 13 and 7 are readily accessible for proper lubrication from time to time by an attendant. 7

From the foregoing description, taken in connection with the accompanying drawing, it is thought that the complete construction, operation and advantages of the invention will be readily apparent to those skilled in the art.

What I claim is:

1. An over-speed governor, comprising a stationary support, a latched device for applying power to a part to be governed, means for moving said part for purposes described, when unlatched, an oscillating arm, means to oscillate said arm through an arc of constant degree and at variable speeds, and means carried by said arm normally inert but having movement from the arm toward the latched device upon the arm exceeding a predetermined speed so as to engage and release said latched device.

2. An over-speed governor, comprising a stationary support, an arm pivoted to said support, a hammer carried by and normally oscillating with said arm as a unit, means to hold said hammer immovable with respect to said arm at all speeds of oscillation of the arm below a predetermined speed, said hammer being moved outwardly with respect to said arm by the oscillating force at said predetermined speed, a lever pivoted to said support, a latch carried by said lever and a latch stop on said support to hold the lever immovable when latch and stop are engaged, a spring for holding latch and stop in engagement and exerting a pull on said lever in one direction, means to connect said lever with a machine to be governed, and means for connecting said arm with a part of said machine to effect oscillation of said arm through an arc of fixed degree.

3. An over-speed governor, comprising a stationary support, an arm pivoted to said support, a hammer carried by and normally oscillating with said arm as a unit, means to hold said hammer immovable With respect to said arm at all speeds of oscillation of the arm below a predetermined speed, said hammer being moved outwardly with respect to said arm by the oscillating force at said predetermined speed, a lever pivoted to said support, a latch carried by said lever and a latch stop on said support to hold the lever immovable when latch and stop are engaged, a spring for holding latch and stop in engagement and exerting a pull on said lever in one direction, means to connect said lever with a machine to be governed, and means for connecting said arm with a part of said machine to efiect oscillation of said arm through an arc of fixed degree, said arm having a cylinder in which said hammer is mounted, and tension spring in said cylinder and means for adjusting the springs tension so that the hammer will act at any speed for which it is adjusted.

4. The combination, with an engine having a means of control by which it may be stopped; an over-speed governor comprising a stationary support, an oscillating arm pivotally mounted on said support, means to oscillate said arm from a moving part of said engine and through an arc of constant degree, means continuously tending to act on said means of control to stop the engine, a latch to hold said continuously-tending means against acting, and means carried by said arm and movable with it as a unit and operating at a predetermined over-speed for engaging said latch to release it.

5. The combination, with an engine having a means of control by which it may be stopped; an over-speed governor comprising a stationary support, an oscillating arm pivotally mounted on said support, means to oscillate said arm from a moving part of said engine and through an arc of constant degree, means continuously tending to act on said means of control to stop the engine,

a latch to hold said continuously-tending means 1 against acting, means carried by said arm and movable with it as a unit and operating at a predetermined over-speed for engaging said latch to release it, and means to hold said arm-carried means against movement relatively to said arm at all speeds below the predetermined over-speed.

FRANK HENNEBCSHLE.

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