US2294124A - Governor construction - Google Patents

Description

Aug- 25 1942- J. l.. MOODY 2,294,124

GOVERNOR CONS TRUCTION Filed'April 8, 1940 2 sheets-sheet 1 PIE- Eig mmm im ulumul/ J W E ATTORNEY Aug.'25, 1942, J L MOODY 2,294,124

qoVERNoR CONSTRUCTION Filed April 8, 1 940 2 Sheets-Sheet 2 NyENToR Job/7 Mona/y ATTORNEY Patented Aug.' 25, 1942 GOVERNOR CONSTRUCTION John L. Moody, Oakland,

Mac poration of California Friden Calculating Calif., assignor to Aliine Co., Inc., a cor- Appucauon april s, 1940, serial No.32s,473

(c1. 20o-ao) f 7 Claims.

This invention relates to governors, and is concerned more particularly with the provision of improved governing means for electric motors of the constant speed type, such as those employed, for example, in driving calculating machines.

In electric motors adapted for constant speed operation from a direct current source of supply, considerable trouble and annoyance has been caused at the make-and-break contacts of the governor because of the building up of material on one contactl from the contacts become rough. These diiiiculties have caused frequent replacement of the points oi the governor contacts and in some instances entire replacement of the governor in an unduly short time.

The instant invention is designed to obviate the foregoing diiiiculties and to provide a governor which can be employed equally well with both alternating current and direct current electric motors, and which particularly is adapted for use with direct current motors by providing selfcleaning points in the make-and-break contacts, so that pitting and roughening of such contacts cannot occur.

It is a general Object of the invention, therefore, to provide an improved governor construction for electric motors.

Another object of the invention is to provide a governor construction of the above type which is particularly adapted for use with direct current motors.

Another object of the invention is to provide improved selfcleaning contact points for the governor of a direct current motor.

Other objects and advantages will be apparent from the following description of certain preferred embodiments oithe invention as illustrated in the accompanying drawings, in which:

Figure 1 is an end elevational view oi thc gov--l ernor construction embodying my invention as mountedon an electric motor; Y

Figure 2 -is a sectional elevational view of the governor shown in Figure l, the view being taken in a plane indicated by theline 2 2 in Figure 1;

Figure 3 is a sectional elevation of the governor construction, the view being indicated by the line 3 3 in Figure 2;

Figure'4 is a sectional elevation of the governor construction, the view being taken as indicated by the line 4 4 in Figure 2;

Figure 5 is an end elevational view of a second governor construction embodyins my invention;

Figure 6 is a sectional view through the governor shown in Figure 5. the

the other contact so that' The bracket plane ot the view beial movement. Shalf 21 is ing indicated by the line 6 6 in Figure 5; and Figure l is a sectional elevational view taken in a plane indicated by the line 1 1 in Figure 6. Referring to Figures 1 to 4, the governor of my invention is shown as applied to an electric motor I0 having a drive shaft casing extensions I2 to provide a mounting for the governor. Across the extensions I2 of the motor casing, an insulating plate I3 may be secured as by screws I 4.

The motor shaft II has a collar i6 secured thereon as by a set screw l1 (Figure 3). The collar I6 *is reduced in diameter at one end to receive a U-shaped bracket I8 which is iirst inserted on the reduced portion of the collar I6 and the end of this portion is then peened or swedged over to hold the bracket I8 in place.

I8 is provided on one side with opposite ears I9 to receive a pivot pin 2| which also passes through inturned ears 22 of a governing lever 23 of L-shape which has its length disposed substantially axially of the shaft II. The inner. end of the governing lever 23 (Figure 3) is forked to embrace the round shoulder 24 of a square collar 26 secured on a governing shaft 21 as by means of a set screw 28 (Figure 4). 'I'he turned end 2l of collar 26 is slidably and rotatably disposed within a recess 29 of motor shaft II. The square portion of collar 26 slidably engages within a square opening in the bracket Il whereby the collar 26 and the shaft 21 are rotated with the motor shaft I I. r

'I'he governing shaft 21, therefore, is mounted for rotation with the motor shaft II and for axpreferably formed oi suitable insulating material, such as Bakelite."

Shaft 21 extends outwardly from collar 26 into an opening 3| of the plate I3 where it carries a collar 32 ot conducting material secured thereon as by a set screw 33. At one end collar 32 carries an annular` contact point 3l adapted for engagement with an opposed contact point 33 which is mounted on a collar 31 supported by conducting bracket 3l on plate I3 to which the bracket 3l is secured as by screws 39. One conducting wire in the motor circuit may be connected to one of the screws 39.

The outer end of the conducting collar 32 is reduced and has secured thereto a contact point Il adapted for engagementl with a second stationary contact I2 supported by an ann 48. Arm I3 is pivoted as by pin 4Il on a bracket II suitably secured on the plate I3. Intermediate its ends, the arm 33 is provided with oset portion I1 forming a seat for one-end of spring I) II and having opposite kbalanced'relation with respect tos-the axisf-of rotation.

having its other end seated on washer I8 carried by adjusting screw Il.' -Screw Il is-threaded into the plate I3 andis secured in adjustment with respect thereto by the nut $2. To complete the Vmotor circuit, a second conducting wire may be secured as by soldering to the lever I3 so that lever 43, contact points Il, I2, collar I2, contact points 3|. 3 8, collar 31 and bracket 38 all form a part of the motor circuit.

In operation. the screw 5I is adjusted so that the desired compression is placed on spring 68 to resist endwise movement of the governing shaft assembly 21 under the thrust of the' governing lever 23. When the revolutions of the motor exceed the adjustment of the spring Il, governing lever 2 3 becomes eii'ective under centrifugal force to actagainst collar 28 and move shaft 21 endwise to-compress spring ll and separate contact points Il and 36 and thereby break the motor circuit. The circuitremains broken until the revolutions of the motor have decreased to again permit the spring I! to be- 4 come effective and urge the contact points 34 and 3G back into engagement. It will be noted that both sets of contact points 2l, 38 and ll. 42 are always subject to relative rotation to provide a self-cleaning action and prevent any build-up from one contact to the other so that an even and. bright conducting face is always available for carrying the current to the motor;

Also, screw BI is located in an accessible position "to enable adjustment of spring 48 while the governor and motor are operating.

Referring to Figures 5 to '1, a modified form of construction is provided wherein the governing lever is mounted in statically counter-baiancedrelation with respect to the axis oi rotation. Similar parts are numbered similarly.

lThe construction includes a motor Il having a motor drive shaft Ila with a reduced end on which a collar Ita is secured as by a set screw I1. The collar lla is provided with a diametral slot 6l and is also recessed as-at 62 to receive sleeve I claim:

1. In an electric motor governor.- agoverning shaft mounted for axial movement in alignment with the motor shaft, said shafts being connected for simultaneous rotation, a governing element mounted for rotation with said motor shaft and connected to said governing shaft to effect said endwise movement thereof, a rotating contact carried by said governing shaft. a non-rotatable contact mounted for cooperation with said rotating contact. endwise movement of said governing shaft effecting opening and closing of said contacts, and spring urged means for resisting endwise movement of said shaft, said means including adjusting means for varying the tension of said spring urged means.

2. In an electric motor governor, a governing shaft mounted for axial movement in alignment with the motor shaft, said shafts being connected for simultaneous rotation, a governing elementy second rotating contact, and spring urged means for maintaining said last tacts in engagement.

3. In an electric motor governor. a motor shaft, a governing shaft mounted for axial movenamed pair of conment. said shafts being connected for simultaneous rotation, a governing element mounted for rotation with the motor shaft and Aconnected to said governing shaft to effect said endwise movement thereof, a pair of electrically -connected rotating contacts carried by said governing shaft, and a pair of contacts mounted for I3 secured on governing shaft 21. by set screw 6I.

Sleeve 63 is also provided with a diametral slot to receive a governing a'rm 6i disposed in the diametral slot BI in sleeve ita and pivoted therein as by. a pin 86. The governing member 65 is symmetrical with respect to the axis of rotation of the motor shaft I la so as to be statically balanced. However, the pivo't point 6B is oifset so that the governor arm will swing under the effect of centrifugal force from its rest position as shown in Figure s in the direction indicated by the arrow to eect endwise movement of collar 62 and shaft 21.

Shaft 21 carries conducting collar 32 having respective contacts 3l and. Il secured thereon for cooperation with respective contacts 38 and 42. Contact 36 is carried by collar 31 mounted in bracket strip 38a secured on plate i3 as by bolts 39a to which one of the motor leadwires is secured. Contact 4I is in constant engagement with opposed contact I2 which is carried byadjusting lever a pivoted at a on bracket lia and having its opposite end engaged by compression spring l8a seated against the end of adjusting screw ila threaded in plate Il.

The operation of the above governor is similar in all respects to that as described in connection with Figures l to 5 except that the action of the governing member l5 provides a very sensitive construction because of its countercooperation respectively with said rotating contacts, endwise movement of said governing shaft effecting opening and closing of at least one pair of said contacts.

4. In an electric motor governor, a governing shaft formed of insulating material and mounted for axial movement in alignment with the motor shaft, said shafts being connected for simultaneous movement, a governing element mounted forrotation with said motor shaft and connected to said governing shaft to effect axial movement upon increase of speed of said motor, a pair of rotating contacts on said governing shaft, and a pair of non-rotatable contacts for engagement respectively with said rotating contacts, endwise movement ofsaid governing shaft effecting opening and closing of one pair of said contacts.

5. In an electric motor governor, a governing shaft formed of insulating material and mounted for axial movement in alignment with the motor shaft, said shafts being connected for simultaneous movement, a governing element mounted for rotation with said motor shaft and connected to said governing shaft to eii'ect axial movement thereof away from said motor shaft upon increase of speed of said motor, a pair of rotating contacts on said governing shaft, a pair of stationary contacts mounted for engagement respectively with said rotating contacts, endwise movement of said governing shaft effecting open- .l ing and closing-'of one pair of said contacts.

,Y counterbalanced a drive shaft, a collar mounted on said drive shaft having a diametral slot, a governing member extending through said slot in substantially relation with respect to the axis of said shaft, said element having an off-center pivotal connection with said collar. a governing shaft mounted for endwise movement in axial alignment with said motor shaft, said governing shaft having a diametral slot, a governing mem- 15 ber extending through said slot in substantially counterbalanced relation with respect to the axis of said shaft, said element having an off-center pivotal connection With said collar, a governing shaft mounted for endwise movement in axial alignment with said motor shaft, said governing shaft having an end disposed for engagement by said governing, member, and contact means adapted for opening and closing by movement of said governing shaft, one of said contacts being connected to said governing shaft for rotation therewith and the other of said contacts being stationary and adapted for engagement with said rotating contact.

JOHN L. MOODY.

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