US2862079A - Governor switch - Google Patents

Description

Nov. 25, 1958 w. M. BURNSIDE I 2,862,079

GOVERNOR SWITCH Original Filed Sept. 10. 1954 3 Sheets-Sheet 1 IN V EN TOR.

li/fer 50/20 e Nov. 25, 1958 W. M. BURNSIDE GOVERNOR SWITCH 5 Sheets-Sheet 2 HIIN Amp W q: 140 "w ll 1 x .i IMO .142

.961. 1/ I 'i H'H Q1291 "M C) .Tx; Form/ Nov. 25, 1958 w. M. BURNSIDE GOVERNOR SWITCH 3 Sheets-Sheet 3 Original Filed Sept. 10. 1954 United States Patent GOVERNOR SWITCH Walter M. Burnside, Waukegan, Ill., assignor to Raymond T. Moloney, Chicago, 111.; American National Bank and Trust Company of Chicago, executor of the estate of said Raymond T. Moloney, deceased Original application September 10, 1954, Serial No. 455,217, new Patent No. 2,709,593, dated May 31, 1955. Divided and this application April 12, 1955, Serial No. 500,797

7 Claims. (Cl. 200-105) drive means individually operable to effect the different turning rates of the shaft means in response to input signals or control pulses applied thereto from some desired external source which supplies the governing factors.

Other objects relate to the provision of switches actuated by cams of desired control shape on a differential shaft means, and a differential gear means with separately operable electromagnetic means for effecting reverse action of the shaft means at different rates in response to similar input or governing pulses.

Additional objects and aspects of the invention pertain to details of the connections, structures, and operation of the illustrative embodiment described hereinafter in view of the annexed drawing in which:

Fig. 1 is a. skeletonized perspective of the essential components of the governor switch;

Fig. 2 is a front elevation of the governor unit;

Fig. 3 is a top plan view of the governor unit;

Fig. 4 is a fragmentary rear elevation of the cam switch means of the governor unit;

Fig. 5 is a fragmentary vertical section of the differential gear means looking in the direction of lines 5-5 of Fig. 3;

Fig. 6 is a fragmentary vertical section of the differential gear means looking in the direction of lines 66 of Fig. 3;

Fig. 7 is a fragmentary vertical section through the complete differential gear means of Figs. 5 and 6 looking at right angles to the latter views.

The governor switch is constructed as a compact unit, as will appear from the top plan view in Fig. 3 wherein the structure is seen to include a pair of frame plates 90 and 91 secured in spaced relation by means of spacers 92, plate 90 having an offset mounting flange 90A. Brackets 93 and 94 are bolted to plate 91 to serve as mounts for the several snap switches 132A-136A, which ride the corresponding cam discs 132-136 fast on the governor shaft 128, the relative positions of the cams and switches being illustrated in Fig. 4.

Referring still to Fig. 3, it will be observed that the differential gear unit generally indicated at 95 is disposed between the mounting plates, and as shown in the detail of Fig. 7, consists of bevel gears 96 and 97 meshing with a pair of planetary pinions 98 carried on a stub shaft fixed on the governor shaft 128. The bevel gear 96 is driven (Figs. 5 and 8) from stub shaft 96E "ice through a train of gears 96A, 96B, 96C, 96D; whereas the other bevel gear 97 and its companion gear 97A is similarly driven through intermediates 9713 from drive pinion 97C on stub shaft 97D.

The gear ratios for the gears associated with the differential gears 96, 97 are not the same, so that for equal displacements of the stub shafts 96E and 97D the rotation of shaft 128 will be different.

As seen in Fig. 2, the stub shaft 96E is driven by the ratchet gear 129 fast thereon, while the other stub shaft 97D is driven by ratchet gear 130, there being separate electromagnets 137 and 140 mounted on the plate with corresponding pawl means 137A, 140A for stepping said ratchets to produce the aforesaid opposite rotative movements of the governor shaft, each ratchet having a corresponding holding pawl 129A, 130A to prevent retrograde movement.

The operation of the governor will be understood from the skeletonized view of Fig. 1 in which the electromagnet 137 may be energized from any desired control circuit (not shown), such as that described in said Patent No. 3,709,503, thereby moving the ratchet gear 129 one step for each impulse to the coil, the resulting motion of stub shaft 96E being transmitted through pinions 96C,

, 96D, and the intermediate gearing 96B to gear 96A and its bevel gear 96, with a resultant displacement of the planetary pinions 98, which are carried for planetary rotation on the governor shaft 128.

Impulsing of the electromagnet from any other verse movement of shaft 128 from that produced b actuation of coil 137.

The gear ratios mentioned heretofore, as well as the. mathematical development orevolutionof the several cams 132136"and angular locating thereof will produce the desired operations at different times responsive to rotation of the governor shafts, said operations being averaged on computed frequency tables based upon a desired or predicted frequency of operation of the drive means or electromagnets 137 and 140, depending upon the desired performance required of the unit and which will form the basis for the selection of said ratios and cam characteristics.

It is contemplated that the invention shall not be limited to any precise details of structure, arrangement, operation or circuit plan or connection, excepting as may be specifically required by the appended claims.

I claim:

1. Governor means of the class described comprising a plurality of governor switches and corresponding actuating cams driven from a common shaft, separate electromagnetic drive units for rotating said shaft different angular amounts in opposite directions responsive to impulseoperation of said drive units, differential gear means interconnecting said shaft with said drive units, separate energizing circuits for said drive units, said governor switches being adapted for connection in circuits to be controlled, and being opened and closed by said cams in accordance with the relative frequency of operation of said drive units.

2. A governor switch comprising a plurality of governing switches adapted to be connected in circuits to be controlled, cam means rotatable in opposite directions to actuate said governor switches, a common shaft for said cam means, dilferential gearing driving said shaft in opposite directions at different gear ratios, and electromagnetic stepping means selectively operable to drive said difierential gearing in said opposite directions.

3. A differential switch comprising a shaft, switchopera-ting means carriedby said shaft, two electromagnetic ratchet devices each adapted for connection to a separate control circuit to be respectively and independently actuated thereby and each including a ratio-determining mechanism of different ratio value'from the other, and differential drive means rotatively interconnecting said shaft with both ratchet devices to'be stepped inopposite directions by actuation of one or the other of said. devices; the angular displacements of the shaft imparted by the said ratchet devices inaccordance with the ratio value aforesaid beingditferent in each case.

4. A switch mechanism comprising a rotatable shaft, cams rotatable with said shaft, switch means mounted adjacent said shaft for actuation severally by said cams; separate reversely-operating ratchet stepping mechanisms and ratio-determining'means'drivingly interconnecting the same with said shaft; separate electromagnet actuating means for each stepping ratchet. mechanism and respectively energizable by sequential pulses to effect stepping action of the appertaining ratchet mechanism; the magnitude of each step produced by one saidstepping mechanism being different from that of theother said mechanism in accordance with the relative ratios of said determining'means whereby the reverse stepping movements imparted thereby to said shaft will be of different mag nitude in opposite directions and the relative rates of travel of said switch-operating cams will be correspondingly different in said opposite directions.

5. In a power-actuated switch mechanism, in combination: a shaft; a differential gear set including a pair of reversely drivable gears concentrically rotatable with,

displacements of said shaft at. different. relative ratios per step responsive to pulsing of the appertaining electromagnetic device; and switch-actuating means carried by said shaft.

6. A governor switch comprising a switch-actuating shaft rotatable in opposite directions; a plurality of switch devices mounted adjacent said shaft; means moved by rotation of said shaft in either direction for selectively actuating certain of said switch devices at some angular position of travel of the shaft in either direction; a differential drive mechanism connected to drive said shaft reversely dependently upon application of reverse driving pulses to said diiferential mechanism; and means including separate electromagnetic means respectively actuating gear means of ditferent ratios having driving connection with said differential mechanism for operation responding to pulses of substantially the same duration to produce rates of actuation of said switch means by said shaft means which are different in opposite directions.

7. Switch mechanism of the class described comprising, a shaft, switch-operating members rotated by said shaft, switch means actuated respectivelyby said members; a differential gear drive connecting with said shaft and having two driving gears difierentially interdriven by a pair of planetary idling pinions; a toothed stepping ratchetfor each of said driving gears and means drivingly connecting the, same therewith, the number of teeth on said ratchetsbeing unlike; and pawl means operable to step each of said ratchets independently; the driving connections between said ratchets and the corresponding differential driving gears being in opposite senses, whereby stepping of one-of said ratchets produces a reverse rotation of said; shaft from the other ratchet, and at a different angular rate.

Referencesv Cited in the file of this patent UNITED STATES PATENTS 732,157 Bedw-orth June 30 1903 884,441 Weser Apr. 14, 1908 1,040,940 Grunow Oct. 8, 1912 2,379,415 Charbonneaux July 3, 1945

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