US1491532A

US1491532A - Circuit controller

Info

Publication number: US1491532A
Application number: US265517A
Authority: US
Inventors: William H Holder
Original assignee: Cutler Hammer Manufacturing Co
Current assignee: Cutler Hammer Manufacturing Co
Priority date: 1918-12-06
Filing date: 1918-12-06
Publication date: 1924-04-22
Anticipated expiration: 1941-04-22

Description

A ril 22, 1924. 1,491,532

W. H. HOLDER CIRCUIT CONTROLLER Filed Dec. 6, 1918 2 Sheets-Sheet l April 22 1924.

w. H. HOLDER cmcum' CONTROLLER Filed Dec. 6, 1918 2 shuns-sheet 2 Patented Apr. 22,1924.

. (UNITED{STATES1 WILLIAM H. notnnltor MILWAUKEE, wisconsm, ASSIGNOR T rm: CUTLER-HAM;

I 1,491,532 PATENT OFFICE.

. MER MFG. 00., OF MILWAUKEE; WISCONSIN, A CORPORATION OF'WISCONSIN.

cmcorr CONTROLLER.

" Application aied'ne mbere, 1918. Serial No. 265,517.

To all whomit may concern:

Be it known that 1,;VV1LL1MI H. HoLnEu, a citizen of the'United States.residing at Milwaukee. in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Circuit Controllers, of which the following is a full, clear, con cise. and exact description, reference being had to the accompanying drawing,

forming a part of this specification.

This invention relates to circuit controllers and more particularly to controllers for motor driven devices operating between predetermined limits. v

Among the objects'of the invention is that of providing a controller effective to limit operation of the controlled device to a predetermined range and, also operable at will for starting, stopping and reversing of the controlled device within the range limits thereof.

A further object is to provide a controller of the aforesaid character wherein provision is made to insure against restarting of the-controlled device in the same direction following attainment of its limit in that direction and prior to actual movement thereof in the reverse direction} A still furtherobject is that of roviding "a controller of thecharaoter a orestated wherein a single swjitch mechanism is adapted to perform all requisite functions thereof, which mechanism .may also be readily adapted without modification of its permanent structure to usein other anal.o-.

gous' control systems. I "arious other ob ects and advantages of the in ention will hereinafter appear.

Thea ccompanying drawing illustrates an embodiment of the invention particularly a 'Jplicable totrucks having platforms to be raised and lowered byelectric motors and the same will now be described. it being however. understood that the capabilities of the invention are in nowise limited to the use but taken at a different angle;

Fig. 3 is an elevational view of the switch mechanism; Y

Fig. 4 is an'elevational view operating mechanism;

Figs. 5 and 6 are detail views of portions of the switch operating mechanism;

7 is a diagrammatic view illustrating the use of the controller for starting and limiting a reversible motor; and.

Fig. 8 is a similar view illustrating the applicability of the control switch to systems wherein the motor is non-reversing.

Referring to Fig. 1,.the controller comprises a switch including contact members 1 and 2 fixed to a shaft 3, amember 4 mounted on the shaft 3 to slide axially thereof but to rotate therewith, a member 5 rotatably mounted on the shaft 3 and movable either manually or otherwise between an intermediate off position and extreme on positions, and a releasable connection between the members 4 and 5,.

of the switch Said connection includes pawls 6 x and 7' (Figs. 5 and 6) which are carried by th member 5 and arranged to engage the member 4t subJect to disengagement therefrom selectively upon movement of said member and 11 to be respectively engaged by the awls 6 and 7, each of which is provided with a blade-like extremity disposed at right angles to said member. Thus each pawl is adapted to engage its respective lug of the member lthrough a given portion of the range of movement thereof axially'of the shaft and so long asboth of said pawls en gage their respective lugs on the member; they afiord a connection whereby said memberjmay be rotated in either direction by the member 5 for reverse operations of the switch On the other hand, the member 4 is movable in one direction to align with a notch 12 in the pawl 7 for release from such pawl and in a reverse direction for release.

from the pawl 6, but the'pawlsare staggered to always insure an operative relationship between one'of the same and said member,

and project beyond each other sufficiently to preserve such relationship in case of overtravel of the controlled device. Hence in one axial position the member at is released from the pawl 7 but subject to movement in a clockwise direction through the medium of pawl 6 while in the opposed position the member a is released from the pawl 6 but subject to movement in a counter-clockwise direction through the medium of the pawl 7. As will appear, the member at is biased to an intermediate angular position and accordingly assuming the aforesaid range of axial movement of member at to correspond to the normal full movement of" the driven mechanism, the. connection between members 4 and 5 provides for operation or the former by the latter in either direction for corresponding operation of the switch so long as the driven mechanism occupies an intermediate position and for automatic release of the member 1 and consequent return of the switch to its off position when the driven mechanism attains either of its limits. Furthermore when either limit is reached and the member 4 is returned to its intermediate position, the connection insures against return thereof to the position last occupied thereby, while providing for movement or said member, and consequently said switch, in a reverse direction for restart ing the controlled mechanism in reverse. hen, however, the controlled mechanism is so restarted to move the member 4. a slight distance axially of the shaft 3 said member re-engages the previously disengaged pawl thereby again placing the member 1} and said switch under the control of member 5 for operation in either direction at will.

The member 4: is biased to the aforesaid intermediate angular position by a lever 13 held under tension by a spring 14: and provided with a roller 15 to engage the periphery of said member which is provided with

cam surfaces

16 and 17 and an intermediate notch 18. The roller rests in the notch in the intermediate angular position of the member 4 and rides onto one or the other of the cams when said member is moved in either direction to bias the same in a reverse direction. The pawls 6 and 7 are secured to the member 5 by

bolts

19 and 20 which form pivots therefor and the free ends of said pawls are connected by a tension spring 21 to yieldingly retain the same in operative relation with respect to the

lugs

10 and 11 of the member 1. In view of the rectilinear movement of the member 4 to disengage and re-engage the pawls it is desirable in order to insure against possible jamming of such parts to cut away said member between the lugs and cam portions thereof as illustrated to clear said pawls. And in the event of either pawl being out of proper alignment with respect to the member 4 when the latter is moved to re-engage the former the spring 21 permits such pawl to yield and slide over its respective lug for return to operative relation therewith upon relative movement of the members a and hen the member 5 is to be manually operated it is desirable to provide means for restraining the same in its various positions and to this end there is provided alever 22 having a roller 23 to engage the periphery of said member which has therein a V- shaped notch 24 to receive said roller in the intermediate angular position of said member and curved notches 25 and 26 to receive said roller in the opposite extreme positions of said member. The spring 14:, above mentioned, is also used to hold the lever 22 under tension, to this end being connected at its extremities to the two levers 13 and 22.

The switch as illustrated is oi the reversing type, the contact elements 1 and 2 thereof being oi the construction shown in l and 3 and being arranged to co-operate with stationary contacts also shown in said figures. The contact elements 1 and 2 are of the same construction, each comprising a casting having three

contact lugs

30, 31 and 32 and a clamping plate 3?) to secure the same to the shaft 3, said shaft being square in cross section and provided with an insulating covering 3%. The

contacts

3 and 32 are arranged substantially 9O apart and the two elements 1 and 2 are mounted on the shaft in an opposite relation. Further, the contact lugs 31 of the two elements are provided with lateral extensions which are oppositely disposed as best illustrated in Fig. 1. The stationary contacts comprise

lingers

35, 36, 37 and 38 arranged in pairs on opposite sides of the shaft 3. the

fingers

35 and 37 being disposed in the path of Cfilltfli't

lugs

30 and 32 oi said element 1 and the fingers 36 and 98 being disposed in the path of the correspolniling contact lugs of element 2. Also. both fingers 35 and 536 are disposed in the path of the contact lug 31 of element 1 while both oi the

fingers

37 and 38 are disposed in the path otthe corresponding contact lugi of element 2. The contact fingers are of a well known yielding type and the pairs thereof are respectively fixed to supports 39 and 40 for insulation of each of said lingers from all of the remaining fingers.

Thus when the shaft. 3 is rotated clock wise element 1 bridges contact fingers 3" anz; 37 while element 2 bridges lingers 36 and 38 whereas when the shaft is rotated counter-clockwise element 1

bridges fingers

35 and 36 and element 2

bridges fingers

37 and 38. Accordingly assuming use of the switch for control of a series motor as depicted in Fig. 7. said switch provides for reversal of the direction of flow of current in the armature circuit of: said motor. Re-

ferri i to Fig. the motor is shown as rov ed with an armature A and a series eld winding F, said'armature being' connected between contact 'fingers38 and 35 circuit and effecting" a through the armaturewfi om right to left.

1 while said field is connected between finger 36 to one side of thezline,'the other side of the linefbeing connected to finger '37; With this arrangement when the movable p contactelements which areshown in plan;

are moved to the: left, they respectively bridge fingers 37 and38 and fingers and 36fto complete the motor, circuitand to et fectfioiv of current through the armature circuit from left to right. 3 On the other hand, when the contact elements are moved in a reverse direction. elements '1 and 2 bridge finger35iwith-finger 37 and finger 36f with finger 38 for completing the motor flow of current 'While the mechanism above described may be mounted in any preferred manner, the same is shown as enclosed in aicasing 42 having. a removable cover43'. L One end of the shaft 3 has a bearing 44 in one Wall of the casing and the other'end of said sha't't has a bearing inthehub of member 5 while to a bracket 53 projecting inwardly from wall of said cas'i said hub has a bearing45 in [an opposite (F'ig; 1). The shaft 9 is disposed atri t angles to the shaft '3 and as illustrate in Fig, ,4fhas bearings 4.6 'andc47 in opposite-walls of the'vcasing.

- The levers 13: and'22 'ar'e spivotally' connected by pins 48 and 49'respectively to lugs 50 a and 51 provided on thej'inside of oppositev walls of the casin'g abovethe bearings of the shaft 9, and thesupports39 and 40 v0t the contact fingers are secured by bolts 52 the .front wall of the casing.v The cover 43 comprises a sheet metal plate having struck in -1ugs5 4 and '55, (Fig.3) to snap into recesses provided in opposite walls of the casing.

Referrin to p I v diagrammatically a circuit arrangement whereby the aforedesc'ribed switch'is adapt ed to control the continuity of circuit of y a non-reversible motorhaving a power con'-' nection with the driven device of such char- I acteraas to provide for operation vof latter in opposite directions I 7 From inspect on of this figure it is (obvious' that the contactarrangement is-identicalwith that of Fig." 7;, whereby with the connections illustrated, thejswitch isoperable as aforedescribed to provide automatic stopping of the motor santl thecontrolled device upon operation thereof to the limit of movement of the latter in eitherdirec tion, whereas followinglsuch automatic stop pingpthe motor maybe restarted only upon movement of theswitch to its reverse position, While between limits the switch is manually operable both for starting and; stop- Fig 8-, the Same illustrates ping as the arrangement aforedescribed- While. the constructions aforedescribed contemplate the directgcontrol of the motor circuit, it'is obvious that suitable relays may be interposed in cases where remote control is desired or where the value of the current to be'handled renders such an arrangement necessary or desirable.

VVl atI claimas new anddesire to secure by Letters Patent is: i

1. In a' controller for a inotordriven device, the combination with relatively sta-- tionary contacts, of a co-operating contact-s ing element movable in opposite directions from an intermediate position for starting the controlled device in opposite directions selectively and actuating means for said contacting element including variable connections controllable for limiting the actuating power of said former means to unidirectionalactuation of said contacting element.

2. In acontroller for a motor driven device, the combination with relatively stationary cont-acts, of a co-operating contacting element movable in opposite directions from an intermediate ofi' ositioi for starting the controlled device in opposite directions selectively and actuating means for said contacting element including a releasable connection, and means to act upon said connection for rendering said former means temporarily ineffective for actuating said contacting element in one direction.

- 3. In a controller for a motor driven device; the combination with relatively stationary contacts, of a contacting element biased toanintermediate off position with respect thereto and movable in either direction from such position to engage certain of said contacts for starting the controlled device in opposite directions selectively and actuating means for so moving a said contac'ting element including a connection removement of thecontrolled device'for mov- ,ing said contacting elementin either direction from such intermediate position 7 for starting said device in either direction subject to stopping thereof at will, said actuating means including means subject to release "upon movement of the controlled device beyond such range of movement for rendering said actuating means temporarily ineflective toactuate said contacting elements in one direction only. 1

5. In a controller for a motor driven device, the combination with relatively stationary contacts, of a contacting element biased to an intermediate off position relative thereto and movable in either direction from such position to engage certain of said contacts, and actuating means eii'ective within a predetermined range of movement of the controlled device for moving said contact-ing element in either direction from such intermediate position for starting said device in either direction subject to arrest thereof at will by return of said element, said actuating means including means operable upon movementof the controlled device in either direction beyond such range of movement to release saidcontacting element from said actuating means for return of the former to off position under its bias.

6. In a controller for a motor driven device, the combination with relatively stationary contacts, of a cont-acting element biased to an intermediate off position relative thereto and movable in either direction from such positionto engage certain of said contacts, and actuating means effective within a predetermined range of movement of the controlled device for moving said contacting element in either direction from such intermediate position for starting said device in either direction subject to arrest thereof at will by return of said element, said actuating means including means operable upon movement of the controlled device in either direction beyond such range of movement to release said contacting element from said actuating means for retur of the former to oli position under its bias and to render the latter temporarily ineffective to return the former to the position last occupied thereby.

7. In a controller for a motor driven device, the combination with relatively stationary contacts, of a contacting element biased to an intermediate oti position relative thereto and movable in either direction from such position to engage certain of said contacts, an actuating member having an operative connection with said contacting element for moving the same in either direction from such intermediate position for starting said controlled device in either direction selectively, and means to act upon said connection following operation of the controlled device to apredetermined limit to release said contacting element from said actuating member for return of the former to off position under its bias while rendering the latter ineil'ective for moving the former to the position last occupied thereby pending reverse operation of the controlled device.

8. In a controller for a motor driven device, the combination with relatively stationary contacts, of an oscillatable contacting element adapted to engage the same selectively for starting the controlled device in opposite directions, a relatively oscillatable actuating member having a releasable connection with said contacting element for moving the latter in either direction during operation of the controlleddevice between predetermined limits and means efi'ective upon movement of the controlled device be yond either of said limits to release said connection and render said actuating device temporarily ineffective for actuating said element in one direction only.

9. In a controller for a motor driven device, the combination with relatively stationary contacts, of a co-operating contacting element and an actuating member therefor, said element and said member having a releasable connection therebetween for causing the same to move in unison in either direction from an intermediate position for starting of the controlled device in opposite directions selectively, and means for effecting release of said connection and temporarily limiting the actuating power of said member to unidirectional actuation of said element pending a given subsequent operation of the controlled device.

10. In a controller for a motor driven device, the combination with relatively stationary contacts, of a contacting member movable in opposite directions to engage the same selectively for starting the controlled device in opposite directions, an actuating member for said contacting member movable in opposite directions, said members having a releasable connection therebetween including means operable in unison with the driven device to temporarily limit the former member to unidirectional operation by the latter member.

11. In a controller for a. motor driven de vice, the combination with a reversely movable contacting member, of a similarly movable actuating member therefor and a releasable connection therebetween including a ratchet member and :1V pair of opposed pawls normally co-operating therewith to provide for joint movement of said reversely movable members in either direction, said ratchet member being subject to operation in unison with the driven device to selectively disengage said pawls at given limits.

12. In a controller for a motor driven device, the combination with a reversely movable contacting member, of a. similarly movable actuating member therefor and a releasable connection therebctween including a ratchet member and a pair of opposed pawls biased to engage the same simultaneously to provide for joint movement of said reversely movable members in either direction, said ratchet member being movable to disengage said pawls selectively.

13. In a controller for a motor driven device, the combination with a reversely movable contacting member, of a similarly movable actuating member therefor and a releasable connection therebetween including a ratchet member and a pair of opposed unidirectional operation.

pawls each adapted to provide for moving said ratchet member in one direction, sai

pawls normally co-operating to provide for movement of said ratchet member in either direction, said ratchet member being movable in opposite directions to disengage said pawls selectively for limiting such drive to 14. The combination witha member to be actuated in opposite directions, of a similarly movable actuating member therean and an operative connection between said. members including a ratchet member adapted to drive said actuated member, a pair of opposed pawls movable with said actuating member and each adapted to move L said lratc het member in: one direction and means biasing said pawls to engage said ratchet member simultaneously to provide for driving of said actuated member in either direction, said ratchet member being movable independently of said actuated member in opposite directions todisengage said pawls selectively forinterrupting such drive in eitherdirection selectively.

member, said connection including a ratchet member and a pair of opposedpawls biased to engage'the same simultaneously to provide for all positions of-the controlled device Within a given range of operation for moving and holding of said contacting member in either direction by said actuating member at will, and means operable by the controlled device upon movement thereof in either direction beyond such range of operation to move said ratchet member for disengaging one of said pawls to permit return of said contacting member to off position under its bias.

In witnesswhereof, I have hereunto sub-' scribed my name.

WILLIAM H. HOLDER.