US2519216A - Inching control system for electric motors - Google Patents

Inching control system for electric motors Download PDF

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Publication number
US2519216A
US2519216A US37027A US3702748A US2519216A US 2519216 A US2519216 A US 2519216A US 37027 A US37027 A US 37027A US 3702748 A US3702748 A US 3702748A US 2519216 A US2519216 A US 2519216A
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United States
Prior art keywords
push button
inching
movement
bias
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US37027A
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English (en)
Inventor
George C Armstrong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to IT454396D priority Critical patent/IT454396A/it
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US37027A priority patent/US2519216A/en
Application granted granted Critical
Publication of US2519216A publication Critical patent/US2519216A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details of starting control
    • H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
    • H02P1/10—Manually-operated on/off switch controlling relays or contactors operating sequentially for starting a motor

Definitions

  • Electric motors employed to drive machine tools or other loads are usually provided with a well known form of starting and interlocking holding circuits for controlling their operation.
  • Initialoperation of a startpush button energizes a relay which operates to start the motor and which closes a holding contact for the purpose of maintaining itself energized when the start push button'isreleased.
  • the motor When the motor is thus started, it will continue to run until its starting relay is deenergized by opening of a stop push button in the relay energizing circuit.
  • One of 'theprincipal objects of this invention is to-provide an inching control system forelectrio motors which is foolproof in operation and which does not require any control relay in addition to the normal starting relay "for the motor.
  • a further object of this invention is to provide an inching control system in which thereis provided-an inching push button which is efiective upon operation thereof to render the conventional start push button inoperative until such time as the start push button ;is positively operated by the operator.
  • Figure 1 is a top plan View of a pair of push button switches constructed in accordance with the principles .of this invention.
  • Fig. 2 is a vertical sectional view of the pushbutton switches shownein Fig. 1-;
  • Fig. 3 is a view similar -.to Fig. 2, with one of the push button switches shown in elevation, together with a diagrammatic sketch of a circuit controlled by the push buttons;
  • FIG. 4 is a detail view of the movable contact the push H operating member employed in .each .of button switches.
  • numeral .1 designates an alternating current motor connected :to alternating supply leads L1, L2 and L3 by'the contacts 2 of a relay 3 :having anenergizing winding 4.
  • Energization of the winding :4 is-normally eflected by a starting circuit :5 which operates to connect the winding 4 across alternating current supply leads LI and L2 through the contacts :6 of a button switch 1 and thecontacts *8 of push button. switch 9 and a stop push button SWllJChulO.
  • the relay 3 is provided with a -holding contact .11 which operates to close a holding circuit 12 for the coil- 4.
  • the holding circuit 12 is ⁇ connected in parallel with the contacts 6 of the start push button switch so that the coil :4 will be maintained energized when the start; is opened after closure v push :button switch 1 thereof.
  • Each of the switches and 9 comprises upper and lower insulating structure 15 and it which are clamped together and secured to a supporting structure ll by threaded fastening elements [8.
  • a push button i9 is movably mounted for vertical rectilinear movement in the upper insulating structure 15 and is provided with a spring 29 for biasing it to its upper position, as shown in Fig. 2.
  • Each of the push buttons l9 has an operating member 2
  • Each of the operating members 2i is provided with a rectangular opening 22, as shown in Fig. 4, in which is mounted a conducting contactor element 23 having a bias ing spring 24 for biasing the contactor element 23 in a direction toward the lower end of the slot 22.
  • the design of the individual push button switches I and 9 is conventional and not part of the invention proper. This, however, does not apply to the features described presently.
  • the push button switch 9 is provided with a latching element 25 which is pivotally connected to the stationary supporting structure [5. A
  • biasing spring 26 is provided for pivotally mov ing the latching element 25 in a counterclockwise direction, as viewed in Figs. 2 and 3.
  • the latching element '25 has a latching part 21 which engages with a surface 28 on the push button 59 of the switch 9 when it is in the position shown in Fig. 2.
  • the surface 28 will be moved downwardly and out of restraining engagement with the latching part 21 which will then move inwardly to a position overlying the notched ledge 29, as shown in Fig. 3.
  • Return movement of the push button l9 on the surface 9 by its biasing spring 29 to the position shown in Fig. 2 will be prevented by the latching part 21.
  • an actuating part 33 is secured to the push button [9 of the switch l.
  • the actuating part 39 will move downwardly into engagement with an arm 3
  • Fig. 2 The normal position of the push button switches I and 9 is shown in Fig. 2.
  • the conducting contactor element 23 of the switch 9 is operable to electrically interconnect the contacts 9.
  • Fig. 3,117 will be noted that operation of the switch! by downward movement of its push button 19 will be effective through its conducting contactor element 23 to electrically interconnect the contacts 9 to thereby energize the starting circuit for the coil 4 of the relay 3.
  • Energization of the relay 3 will cause the holding contact H to close and thereby set up a holding circuit for the coil 4 around the contacts 9 so that when the switch moves to its open positlon the coil 4 will remain energized.
  • both starting circuit 5 and holdingeircuit I 2 is dependent upon electrical connection of thecontacts 9 through the conducting 4 contactor element 23 of the switch 9. Subsequent deenergization of the coil 4 to stop the motor I may be efiected by either operation of the stop push button it? or operation of the push button switch 9 to disengage its contactor element 23 from the contacts 8.
  • An inching control system for an electric motor comprising a relay having a control coil, a starting circuit and a holding circuit connected with said coil, an inching circuit connected with said coil in parallel relation to said starting and holding circuits for energizing said coil independently of said starting and holding circuits, a push button having a first contact structure 7 in said starting and holding circuits and a second contact structure in said inching circuit, said push button having a bias for moving it to a normal position in which said first contact structure is closed and said second contact structure is open, a latch responsive to movement of said push button out of said normal position to close said second contact structure for latching said push button against return movement by its bias to said normal position, and a start push button for said starting circuit efiective upon operation thereof to actuate said latch and release said first named push button for movement by its bias into its normal position to render said starting and holding circuits operative.
  • An inching control system for an electric motor comprising a relay having a control coil, 2. starting circuit and a holding circuit connected with said coil, an inching circuit connected with said coil in parallel relation to said starting and holding circuits for energizing said coil independently of said starting and holding circuits, a push button having a first contact structure in said starting and holding circuits and a second contact structure in said inching circuit, said push button having a bias for moving it to a normal position in which said first contact structure is closed and said second contact structure is open, a latch responsive to movement of said push button out of said normal position to close said second contact structure for latching said push button against return movement by its bias to said normal position, a start push button for operating said starting circuit, and a latch releasing member carried by said start push button for releasing said latch in response to operation of said start push button.
  • a start push button for operating said motor an inching push button for operating said motor independently of said start push button, said inching push button being movable from a normal position rendering said start push button operative to a second osition in which it operates said motor and said start push button is rendered inoperative, said inching push button having a bias for moving it to and maintaining it in said normal position, a latch responsive to movement of said inching push button to a mid positionbetween said normal and second positions for latching it against movement by its bias from said mid-position to said normal position, said inching push button when latched being movable back and forth between said midposition and said normal position, and a part responsive to operation of said start push button for actuating said latch to release said inching push button for movement by its bias to said normal position to render said start push button operable to start said motor.
  • a start push button for operating said motor
  • an inching push button having a firstcontactstructureoperable upon closure thereof to render said start push button operative and a second contact structure operable upon closure thereof to operate said motor independently of said start push button
  • said inching push button being movable from a normal position in which said first contact structure is closed through a mid-position in which both of said contact structures are open to a second position in which said second contact structure is closed and having a bias for moving it to said normal position
  • a latch responsive to movement of said inching push button to said mid-position for latching it against return movement by its bias to said normal position
  • said inching push button when latched being movable back and forth between said mid-position and said normal position, and a part operative in response to operation of said start push button for actuating said latch to release said inching push button for movement by its bias from said mid-position to said normal position to render said start push button operative to start said motor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Push-Button Switches (AREA)
US37027A 1948-07-03 1948-07-03 Inching control system for electric motors Expired - Lifetime US2519216A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IT454396D IT454396A (it) 1948-07-03
US37027A US2519216A (en) 1948-07-03 1948-07-03 Inching control system for electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US37027A US2519216A (en) 1948-07-03 1948-07-03 Inching control system for electric motors

Publications (1)

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US2519216A true US2519216A (en) 1950-08-15

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IT (1) IT454396A (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686895A (en) * 1952-03-10 1954-08-17 Cutler Hammer Inc Controller for electric motor driven apparatus
US2787751A (en) * 1953-03-02 1957-04-02 Standard Register Co Motor jogging control
US2843686A (en) * 1948-08-05 1958-07-15 Fed Pacific Electric Co Push button stations
US2868268A (en) * 1954-02-04 1959-01-13 Coulter & Mckenzie Machine Co Coil-forming machine with generator controlled spindle positioning means
US3048693A (en) * 1959-11-27 1962-08-07 Westinghouse Electric Corp Arc welding apparatus
US3211846A (en) * 1962-01-02 1965-10-12 Gen Electric Multiple pushbutton switch with selective latching mechanism

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1424402A (en) * 1922-08-01 hartman
US1607270A (en) * 1924-11-10 1926-11-16 Smith Arthur Ervin Multiple-circuit-control interlocking switch
US2309794A (en) * 1942-02-23 1943-02-02 Cutler Hammer Inc Controller for induction motors
US2354950A (en) * 1943-02-06 1944-08-01 Cutler Hammer Inc Printing press drive
US2416181A (en) * 1945-01-10 1947-02-18 Westinghouse Electric Corp Control system for electric drives

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1424402A (en) * 1922-08-01 hartman
US1607270A (en) * 1924-11-10 1926-11-16 Smith Arthur Ervin Multiple-circuit-control interlocking switch
US2309794A (en) * 1942-02-23 1943-02-02 Cutler Hammer Inc Controller for induction motors
US2354950A (en) * 1943-02-06 1944-08-01 Cutler Hammer Inc Printing press drive
US2416181A (en) * 1945-01-10 1947-02-18 Westinghouse Electric Corp Control system for electric drives

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843686A (en) * 1948-08-05 1958-07-15 Fed Pacific Electric Co Push button stations
US2686895A (en) * 1952-03-10 1954-08-17 Cutler Hammer Inc Controller for electric motor driven apparatus
US2787751A (en) * 1953-03-02 1957-04-02 Standard Register Co Motor jogging control
US2868268A (en) * 1954-02-04 1959-01-13 Coulter & Mckenzie Machine Co Coil-forming machine with generator controlled spindle positioning means
US3048693A (en) * 1959-11-27 1962-08-07 Westinghouse Electric Corp Arc welding apparatus
US3211846A (en) * 1962-01-02 1965-10-12 Gen Electric Multiple pushbutton switch with selective latching mechanism

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Publication number Publication date
IT454396A (it)

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