US2041161A - Control device - Google Patents

Description

May 19, 1936. B. A. BROWN ET AL CONTROL DEV I CE Filed June 4, 1934 2 Sheets-Sheet l INVENTORS BERNARD A- aaown, CARL uxmm. AND ROBERT C. KESTLE BY WA, Wk 9% ATTORNEYS May 19, 1936. B BRQWN AL 2,041,161

CONTROL DEVICE Filed June 4, 1934 2 Sheets-Sheet 2 KNVENTORS BERNARD A. BROWN, CARL H. KIHDL ROBERT C. KESTLE.

%mw, Ma my ATTOR N EYS Patented May 19, 1936 STATES CONTROL DEVICE Bernard A. Brown,

Kestle, Dayton, Ohio,

Carl E. Kindl, and Robert Cn assignors to Delco Products Division of General Motors Corporation, Dayton, Ohio, a corporation of Delaware Application June 4, 1934, Serial No. 728,840 10 Claims. (01. 172-279) This invention relates to improvements in speed-responsive control devices and particularly to such devices especially adapted for use in com nection with electric machines.

it is among the objects of the present inventicn to provide a speed responsive control device of simple structure and design, properly balanced and capable of operating substantially without noise.

A further object of the present invention is to provide a unitary structure comprising a speed responsive control device and an air circuleting device, both these devices heing so constructed arranged as to counterbalance each other.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompany ing drawings wherein a preferred embodiment of one form of the present invention is clearly shown.

in the drawings: I

Figure l is a perspective view of the automatic speed-responsive switch-aetu.ating mechanism and the air-circulating device for the motor.

Figure 2 is a perspective view of the electric switch.

Figure 3 is a group of perspective views of the automatic switch cperating mechanism discs semhiecl.

t is a cross sectional view of the switch and the automatic control mechanism therefor. In this view the control mechanism is shown in normal position.

Figure 5 is a view similar to Figure 4, showing the switch-actuating mechanism. in active posi- 35 ion...

Figure 6 is s. view taken substantially along the line 6--8 of Figure 5, showing the member which engages and actuates the switch.

Referring to the drawings, the numeral 28 designates a fragment of the rotor of the electric machine which may be of any standard construction and, therefore, needs no detailed illustration or description. This rotor is provided with a shaft H by means of which the rotor is rotatably supported in the frame 22 of the motor, only a fragment of which is shown in Figures 4 and 5.

Referring particularly to Figures 2, 4 and 5, the stationary contact 23 is adapted to-be con- 0 nected to the stator winding of the motor,- not shown. This stationary contact 23 is normally engaged by a movable contact 24, carried by the arm 25, which is pivotally secured to a pin 26 secured in the end frame 22 of the motor. A spring 28, interposed between the arm and the frame 22 of the motor, yieldably urges the arm 25 so that its contact 2 3 is moved out of en.- gagement'with the stationary contact 23. On the arm as there are provided rubbing blocks 3t adapted to be engaged by a switch actuating, sleeve made of insulating material, which sleeve is slidably carried upon the rotor shaft 2i and is urged against the rubbing blocks Ell by a spring 33, interposed between a bracket at tached to shaft 2i, and the switch actuator 3i. Spring exerts sufdcient pressure upon arm 25 through actuator sleeve 56 to overcome the effect of spring it upon said arm so that normally spring maintains the arm 25 in a position as shown in Figure in which position the contact on arm it engages stationary contact thus completing a circuit to the stator winding, not shown.

Bracket 36 has a tubular hub portion ti fitting upon the shaft 25 so that said bracket is rotatahle therewith. As shown in Figure 3, this bracket comprises a plurality of radially extending aims and &5. Arm 32 of bracket is on one side of a plane passing through the axis of the shaft it, while arms it and 5 are on the opposite side of said plane. Arm &2 has a portion it formed at right angles to the arm t2, said portion t6 having two singularly shaped, spaced tangs ti and to, each providing a v-shaped pocket in alignment, but spaced as shown in Figures 1 and The member of the automatic control mechanism which is responsive to centrifugal force for purposes of operating the switch actuator it is designated by the numeral This member has a plurality of tangs, two of which, numbered 5i and 52, extend inwardly toward each other from oppositely disposed arm portions 5-3 and respectively. These tangs 5i and 52 pivotally seat into the vi-shaped pockets it formed. in the tangs 5's and 48 of braciret arm Q2. The arms tit and 5& of the member Bil, which member may he termed the governor weight for the purposes of description, extend toward the axis of the shaft 26, the arms being located on opposite sides of the center of the shaft, as shown in Figure 3.. At the free ends of these arms inwardly extending flanges 55 are provided, for purposes to be described. Member has two outwardly extending arms 56 and 51 to which are secured springs 60 which yieldably urge the governor weight into normal position, only one of the springs being shown in Figure 1, the other in the Figure 5. Another downwardly extending tang ii on the member 50 extends into a longitudinal groove 62 in the switch-actuating member 3| normally engaging the inner end wall said groove.

A resilient member ll is secured to the arm 42 by a rivet 13 passing through the openings 1| and 12 on the member III and bracket 34 respectively'. This rivet has an enlarged head about which one end of spring 33 fits so that dislodgment or disalignment oi the spring is prevented. A plurality of flexible tongues are provided on member II, the nrst, designated by the numeral Ii, being engaged by and forming a cushioning element for the governor weight 50 when it is urged into a normal position under the effect 01 springs I. Figure 4 clearly illustrates how the member ill engages this flexible tongue I! when in normal position. Two spaced flexible tongues ll of member I. engage the lower edges of tangs II and II oi the governor weight resiliently holding them in pivotal engagement with the V- shaped pocket 4! o! tangs 41 and 48 of the bracket 4!. Thus tongues 18 normally yieldably maintain the governor weight in hinged engagement with the bracket arm 42. Two other flexible tongues 11 are provided on the member 10 which, when said member is attached to bracket arm 42, are normally spaced from said arm so that when the governor weight is thrown into active position, as shown in Figure 5, due to centriiugal i'orce, flanges 55 of arms 53 and 54 of said governor weight, engage said flexible tongues 11, whereby this movement of the weight is cushioned to prevent impact noises which would occur it the weight were permitted to engage solid parts.

Arms 43 and 45 01' the bracket 34 each have an angular portion I43 and I45, and arm 44 has a similar angular portion on each of its sides, these being designated by numerals I44 and I46 respectively. All of these angular portions provide vanes which set air in motion for the purpose of cooling the motor. The arms 43, 44 and 45, plus their vanes I43, I44, I45 and I46 counterbalance the arm 42 of the bracket 34 and its automatic control mechanism. In order to provide a substantially perfect balance, certain of the arms have openings while others are provided with counterbalancing weights 8|, as needed.

The device functions in the following manner: when the motor is at rest the control mechanism will assume the position as shown in Figure 4 in which contact 24 engages with contact 23 and the switch actuating member Si is exerting a pressure upon the rubbing blocks 30 of arm 25 due to the effect of spring 33. When the main circuit through the motor is closed and it starts to rotate the mechanism will remain in normal position until a predetermined speed of the rotor 20 is attained at which time the governor weight I, due to centrifugal force, will move about its pivotal tangs 5| and 52 in a counterclockwise direction as regards Figures 1, 4 and 5, until it has assumed a position as shown in Figure 5. Moving in counterclockwise direction against the spring 60, interposed between the weight 50 and the vanes I43 and I4! oi the arms 43 and 45, causes tang 8|, which engages the switch actuator 3 I, to move said actuator toward the right upon shaft 2|, as regards Figures 1, 4 and 5, against the effect of spring 33. This permits spring 28 to move arm 25 so that its contact 24 is disengaged from contact I! thus breaking the circuit through the stator winding, not shown. As the weight is moved counterclockwise, such movement sometime occurring rather suddenly, the portions 55 thereof engage with the flexible tongues 11 on the resilient member 10, thus this movement of the weight is combined and checked without any undue noises. As the rotor speed is reduced to a predetermined degree the spring 60 will overcome the eflect of the centrifugal force and move the weight 50 clockwise about its pivotal support and as it approaches its normal position, said weight will engage the flexible tongue 15 of the resilient member 10, thus the return movement o the weight 50 is cushioned and impact noise is substantially eliminated.

The flexible tongues 16 yieidably urge the tangs ii and 52 into the pivotal pockets 4! of the bracket tang portions 41 and 48, providing means which greatly facilitate quiet operation or the device and permitting sufficient play between moving parts without aflecting the operation thereoi.

From the aioregoing it may be seen that applicants have provided an automatic control mechanism for an electric motor, of simple structure and design, for practically all of the parts are made from stampings. The details oi the construction permit easy assembly for substantially all moving parts of the entire mechanism are maintained in assembled position by resilient means which, as has been mentioned before, tend to quiet operation inasmuch as free play may be had between the moving parts without permitting disengagement.

While the form of embodiment of the present :1

invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A speed-responsive control device comprising in combination, a rotatable member; speedresponsive means carried by said member only on one side of its axis and having an axis of movement substantially perpendicular to the axis oi the rotatable member; means adapted to be actuated by said speed-responsive means; air-circulating means secured to the rotatable member on the side of its axis opposite the speed-responsive means, said air-circulating means also counterbalancing said speed-responsive means.

2. A speed-responsive control device comprising in combination, a rotatable member; speed-responsive means adapted to move about a pivot and carried by said member only on one side 0! its I axis the axis of said pivot being substantially perpendicular to the axis of said member; means adapted to be actuated by said speed-responsive means; fan blades secured to the rotatable member on the side of its axis opposite the speed-responsive means, said fan blades circulating air about the rotatable member and providing counterbalancing means for the speed-responsive means.

3. A speed-responsive control device comprising in combination, a rotatable member; a centrifugal governor; means adapted to be actuated by said governor; and air-circulating means secured to the rotatable member, said air circulating means supporting the governor on one side oi. the axis of the rotatable member and providing counterbalancing means for said governor on the opposite side of said members axis.

4. A speed-responsive control device comprising in combination, a rotatable member; means ior circulating air about the rotatable member; a centrifugal governor; means adapted to be actuated by said governor; a bracket attached to said membenhaving radially diverging arms, one of which supports the governor on one side 0! the axis of the rotatable member, the other providing counterbalances for the governor and supporting said means for circulating air about the rotatable member.

5. A speed-responsive control device comprising in combination, a rotatable member; a centrifugal governor having a speed responsive element; means adapted to be actuated by said governor, and a bracket attached to said member, having radially diverging arms, one of which pivotally supports the speed-responsive element of the governor on one side of the axis of the rotatable member, the others providing counterbalances for the governor and having angular portions forming air-circulating fans.

6. A speed-responsive control device comprising in combination, a rotatable member; a governor having a speed-responsive element pivotally engaging said rotatable member; means adapted to be actuated by said governor; and a resilient member yieldably holding said speedresponsive element in pivotal engagement with the rotatable member and providing cushioning stops for the speed-responsive element of the governor.

7. A speed-responsive control device comprising in combination, a rotatable member; a governor having a speed-responsive element pivotally engagingsaid rotatable member; means adapted to be actuated by said governor; and a member having a plurality of resilient portions certain of which yieldably hold the speed-responsive element of the governor in pivotal engagement with the rotatable member, stops for the speed-responsive means at each end of its travel.

8. A speed-responsive control device comprising in combination, a rotatable member; a supporting member attached thereto; a governor having a speed-responsive element pivotally engaging said supporting member; means adapted to be actuated by the governor; and means attached to the supporting member and providing a others providing resilient plurality of flexible tangs, certain of which yieldably maintain the speed-responsive element or the governor in pivotal engagement with the supporting member, others providing resilient stops adapted to be engaged by the speed-responsive element at each end of its travel.

9. A speed-responsive control device comprising in combination, a rotatable member; a

' bracket attached to said member and having radially diverging arms; a governor having a speedresponsive element pivotally engaging one of said arms; means adapted to be actuated by said governor; means attached to the bracket arm supporting the speed-responsive element of the governor, said means having a plurality of flexible tongues, one of which yieldably maintains the speed-responsive element in pivotal engagement with the bracket arm, the others providing resilient cushioning stops for said element at each end of its travel; air-circulating means provided by the bracket arms members axis opposite the governor supporting arm, said means also providing counterbalances for said governor; and resilient means connected between the speed-responsive element and certain of the air-circulating means for yieldably urging said element into normal position against one of the cushioning stops. i 10. A speed-responsive control device comprising, in combination, a rotatable member; a governor having a speed-responsive element movable with respect to the rotatable member; means actuated by the governor upon movement thereof; a bracket having arms, one of which arms, supports the speed-responsive element, and another of which provides an air circulating fan; and resilient means biasing the speed-responsive element in one direction, said resilient means being anchored at one end to the air circulating fan.

BERNARD A. BROWN. CARL H. KINDL. ROBERT C. IUL'STLE'.

on the side of the rotatable

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