US3610386A - Limit stop incremental drive system - Google Patents

Limit stop incremental drive system Download PDF

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Publication number
US3610386A
US3610386A US885397A US3610386DA US3610386A US 3610386 A US3610386 A US 3610386A US 885397 A US885397 A US 885397A US 3610386D A US3610386D A US 3610386DA US 3610386 A US3610386 A US 3610386A
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US
United States
Prior art keywords
clutch
clutches
movement
datum
output
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
US885397A
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English (en)
Inventor
Frederick John Pain
Donald Keerie
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London Ltd
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
Application filed by Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Application granted granted Critical
Publication of US3610386A publication Critical patent/US3610386A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/011—Automatic controllers electric details of the correcting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1503—Rotary to intermittent unidirectional motion
    • Y10T74/1524—Intermittently engaged clutch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18528—Rotary to intermittent unidirectional motion

Definitions

  • This invention relates to actuators.
  • an actuator in which:
  • a first member is movable, from a datum position, in either of two directions, to a stop limited position, against a spring bias urging the member towards the datum position;
  • a second or output member is adapted to be coupled to the first member by a second friction clutch
  • a control arrangement is operable, when in one state, to cause engagement of the clutches so that the output member is able to move to a position determined by the stop limited position of the first member and, when in another state to disengage the clutches so that the first member is able to return, under its spring bias, to its datum.
  • the authority of the actuator is, accordingly, incrementally variable. With the control arrangement in the said one state the output member of the actuator moves to its stop limited position. After the first member has returned to its datum the control arrangement may be again set to the said one state so as to produce a further movement of the output member.
  • the authority of the actuator therefore increases in predetermined increments the number of such increments being determined by the number of times that the control arrangement is set to the said one state.
  • the first member may be a rotary member movable in either sense.
  • an actuator in which:
  • a first rotary member is movable in either sense from a datum position through a stop limited angle against a spring bias urging the member towards the datum;
  • a second or output rotary member is adapted to be coupled to the first rotary member by a second friction clutch
  • a control arrangement which includes an input member manually movable away from and automatically returnable to a neutral position, is operable, when the input member is moved from the neutral position, to cause engagement of the clutches so that the output rotary member is able to rotate through a limited angle determined by the stop limited angle permitted to the first rotary member and, when the input member moves to its neutral position, to cause disengagement of the clutches so as to permit the first rotary member to return, under the bias, to its datum.
  • the clutches may be electrically actuable, and the control arrangement then comprises electrical circuitry switchable to one state to cause clutch engagement and to another state to cause clutch disengagement.
  • the input member may comprise a manually operable electric switch biased towards a neutral position; movement of the switch away from the neutral position switches the electrical circuitry to the said one state and movement of the switch, under the bias, to the neutral position, switches the circuitry to the said other state.
  • the output member may be restrained against movement during disengagement of the clutches.
  • the output member may include a step-down gearing which opposes movement of the output member during clutch disengagement.
  • the circuitry may be operable when switched to the one state, to energize an electric motor connected to the first friction clutch.
  • FIG. 1 is a schematic diagram of a system incorporating an actuator
  • FIG. 2 shows, in part section, a practical packaging of the system of FIG. 1;
  • FIG. 3 is a section on IIIIII of FIG. 2;
  • FIG. 4 is a schematic diagram of the circuitry employed in the actuation of the system of FIGS. 1 and 2;
  • FIG. 5 shows on an enlarged scale an end view of a limit and reset mechanism forming part of the actuator of FIGS. 1 and 2;
  • FIG. 6 is a section on the line VI-VI of FIG. 5.
  • the system (FIG. 1 or FIG. 2) comprises an actuator 11, a reversible electric motor 13, a step-down gearing I5, and a step-down gearing 17.
  • the actuator 11 comprises a first member in the form of a limit and reset mechanism 21, a friction clutch 23, and a fric tion clutch 25.
  • the mechanism 21, shown in detail in FIGS. 5 and 6, has a flanged rotary shaft 27, the flange 29 of which carries an axially extending peg 31.
  • a sleeve 33 Surrounding the shaft 27 there is a sleeve 33 having an arm 35; surrounding the sleeve 33 there is a further sleeve 37 having an am 39.
  • a coil spring 41 surrounds the sleeve 37. The ends of the spring 41 are secured to the sleeves 33 and 37. The ends of the arms 35 and 39 contact opposite surfaces of a wall 43 under the bias produced by windup in the spring 41.
  • the peg 31 extends into the space 45 between the arms 35 and 39 with the result that, the shaft 27 is held in a central or datum position. Under clockwise rotation (FIG.
  • the shaft 27 is connected by a coupling 55 to the output shaft of the friction clutch 23.
  • the clutch 23 is an electromagnetic clutch, preferably of the type in which friction members are urged into frictional engagement by the magnetic field produced by energization of an electric winding.
  • the input to the clutch 23 is connected to the reversible motor 13 by the gearing 15.
  • the flange 29 of the shaft 27 has a recess or cavity which receives an enlarged end 57' of the input shaft 57 of the friction clutch 25.
  • the shaft 57 is fastened to the shaft 27 by a plate 59 secured to the flange 29 by screws, as 61.
  • the clutch 25 is preferably of similar type to clutch 23 that is to say an electromagnetic clutch, preferably of the type in which friction members are urged into frictional engagement by the magnetic field produced by energization of an electric winding.
  • the casing of the clutch 25 also houses a brake 63 which engages the driven friction member of the clutch 25, when the friction members are disengaged, so as to hold the output shaft of the clutch against movement.
  • the output shaft of the clutch 25 is connected by the stepdown gearing 17 to the input shaft of a further friction clutch
  • the clutches 23 and 25 may be controlled by circuitry as shown in FIG. 4.
  • the latter circuitry has an input member comprising a spring centered, double-pole, double-throw switch 67. Manual movement of the switch armature so as to make with contacts 69 energizes the motor 13 with 28 v. DC by way of the limit switches 51 and 53.
  • the driven member of the clutch 25 is subjected to the action of the brake 63.
  • the winding 23' of the clutch 23 remains energized, however, until the switch 67 is manually released by the operator, the winding being energized by a circuit which includes diode 71.
  • the switch 67 is released it centers under its spring bias and the clutch 23 then disengages. With both clutches 23 and 25 disengaged the mechanism 21 is reset under the bias of the spring 41.
  • the associated limit switch i.e. switch 51, closes preparatory to a further actuation of the switch 67.
  • the limited angular movement of the shaft 27, of the limit and reset mechanism 21, is transmitted to a rotary second or output member comprising the output shaft 66 of the system by way of the step-down gearing 17 and clutch 65.
  • the gearing 17 is such that in response to a 180 movement of the shaft 27 the output shaft 66 executes a 12 movement, say.
  • the circuit also includes a further diode 72 which suppresses transients arising at release of the switch 67.
  • a brake 63 is employed to hold the output shaft of the clutch 25, it may be possible, in some circumstances to discard this brake and to rely on the stepdown gearing 17 to act not only to transmit angular motion but also to prevent such motion following disengagement of clutch 25.
  • a first member is movable, from a datum position, in either of two directions, to a stop limited position, against a spring bias urging the member towards the datum position;
  • a second or output member is adapted to be coupled to the first member by a second friction clutch
  • a control arrangement is operable, when in one state, to cause engagement of the clutches so that the output member is able to move to a position determined by the stop limited position of the first member and, when in another state to disengage the clutches so that the first member is able to return, under its spring bias, to its datum.
  • a first rotary member is movable in either sense from a datum position through a stop limited angle against a spring bias urging the member towards the datum;
  • a second or output rotary member is adapted to be coupled to the first rotary member by a second friction clutch
  • a control arrangement which includes an input member manually movable away from and automatically retumable to a neutral position, is operable, when the input member is moved from the neutral position, to cause engagement of the clutches so that the output rotary member 15 able to rotate through a limited angle determined by the stop limited angle permitted to the first rotary member and, when the input member moves to its neutral position, to cause disengagement of the clutches so as to permit the first rotary member to return, under the bias, to its datum.
  • An actuator according to claim 4 in which the input member comprises a manually operable electric switch biased towards a neutral position; movement of the switch away from the neutral position switches the electrical circuitry to the said one state and movement of the switch, under the bias, to the neutral position, switches the circuitry to the said other state.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Operated Clutches (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
US885397A 1968-12-18 1969-12-16 Limit stop incremental drive system Expired - Lifetime US3610386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6012868 1968-12-18

Publications (1)

Publication Number Publication Date
US3610386A true US3610386A (en) 1971-10-05

Family

ID=10485061

Family Applications (1)

Application Number Title Priority Date Filing Date
US885397A Expired - Lifetime US3610386A (en) 1968-12-18 1969-12-16 Limit stop incremental drive system

Country Status (3)

Country Link
US (1) US3610386A (enrdf_load_stackoverflow)
DE (1) DE1963537A1 (enrdf_load_stackoverflow)
GB (1) GB1297117A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078618A (en) * 1976-03-15 1978-03-14 Gardner-Denver Company Torque controller shutoff mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023235A (en) * 1934-06-01 1935-12-03 Gen Electric Spring drive
US2737278A (en) * 1953-05-11 1956-03-06 Donald E Bartelt Drive mechanism
US2810302A (en) * 1954-11-30 1957-10-22 Northrop Aircraft Inc Reversible incremental mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023235A (en) * 1934-06-01 1935-12-03 Gen Electric Spring drive
US2737278A (en) * 1953-05-11 1956-03-06 Donald E Bartelt Drive mechanism
US2810302A (en) * 1954-11-30 1957-10-22 Northrop Aircraft Inc Reversible incremental mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078618A (en) * 1976-03-15 1978-03-14 Gardner-Denver Company Torque controller shutoff mechanism

Also Published As

Publication number Publication date
DE1963537A1 (de) 1970-07-09
GB1297117A (enrdf_load_stackoverflow) 1972-11-22

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