US2917933A - Control device - Google Patents

Control device Download PDF

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Publication number
US2917933A
US2917933A US439013A US43901354A US2917933A US 2917933 A US2917933 A US 2917933A US 439013 A US439013 A US 439013A US 43901354 A US43901354 A US 43901354A US 2917933 A US2917933 A US 2917933A
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US
United States
Prior art keywords
cam
cam follower
ratchet wheel
shaft
pawl
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
US439013A
Inventor
John L Harris
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Individual
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Publication date
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Priority to US439013A priority Critical patent/US2917933A/en
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Publication of US2917933A publication Critical patent/US2917933A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/002—Gearwork where rotation in one direction is changed into a stepping movement
    • G04B13/003—Gearwork where rotation in one direction is changed into a stepping movement with a step for each complete revolution
    • 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
    • Y10T74/1508—Rotary crank or eccentric drive
    • Y10T74/1518—Rotary cam drive
    • Y10T74/1523—Radial cam
    • 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
    • Y10T74/1558—Grip units and features
    • Y10T74/1565—Gripper releasing devices
    • Y10T74/1576—Holding pawl lifter
    • 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
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets

Definitions

  • This invention relates to intermittent drive mechanisms for motor driven timers.
  • the primary object of the invention is to provide an intermittent drive mechanism for a timer cam shaft which serves to hold the shaft in each position and which causes the holding force to disappear for the instant the shaft is moved from one position to the next.
  • the gear 38 is driven by a timer motor (not shown).
  • This gear drives a gear 85 which, in turn, drives a cam 86.
  • This cam operates a cam follower 87 which is held in place by a pivot pin 88 mounted on the back member 7.
  • the cam follower is provided with inwardly extending ears having slotted holes 89 through which the pin 88 extends.
  • the cam follower 87 is also provided with a stop section 90 which is formed to fit into notches 91 in ratchet wheel 92 which drives the cam shaft.
  • the cam follower 87 is also pivotally attached to a pawl 93 which engages the ratchet wheel and which is biased by means of a spring 94.
  • the spring 94 pulls the pawl 93 into the ratchet wheel and also pulls the cam follower 87 into engagement with the cam 85 and the ratchet wheel 92.
  • the cam 86 is driven in a clockwise direction and gradually rotates the cam follower about its stop end 90 which bears against the ratchet wheel. This holds the ratchet wheel and cam shaft stationary in a positive position. At this time the pawl moves backwards to engage the next notch in the ratchet wheel.
  • the spring 94 is free to pull the pawl 93 downwardly and thus rotate the ratchet wheel one notch.
  • a motor driven timer the combination of, a control shaft, a ratchet wheel, a motor driven cam, a cam follower having one portion engaging said ratchet wheel for holding the same, said cam follower having another portion engaging said motor driven cam, lost motion means supporting the cam follower, a pawl arranged to engage the ratchet wheel at a point spaced from the cam follower, means for attaching the pawl to the cam follower and arranged to permit relative movement therebetween, and means for biasing the cam follower against the cam and ratchet wheel.
  • a motor driven timer the combination of, a control shaft, a ratchet wheel, a motor driven cam arranged for rotation and having an abrupt drop-off, a floating cam follower having one portion engaging the ratchet wheel and another portion engaging the cam, means associated with the cam follower arranged to restrain motion thereof relative to the direction of rotation of the cam at the point of engagement of the cam follower therewith, means for applying a biasing force to the cam follower between its points of engagement with the cam and ratchet wheel, whereby the holding force of the cam follower on the ratchet wheel is a function of the force of the cam follower against the cam, and a pawl operated by the cam follower for rotating the ratchet wheel.
  • a control shaft for rotating and holding the shaft from rotation
  • a motor driven cam having an abrupt drop-01f
  • a floating cam follower having one portion engaging the ratchet wheel means and another portion engaging the cam
  • means associated with the cam follower for restraining motion of the cam follower in a direction substantially tangential to its point of engagement with the ratchet wheel means
  • a pawl operated by the cam follower for rotating the ratchet wheel means when the cam followers drops off the cam.

Description

Dec. 22, 1959 J. L. HARRIS CONTROL DEVICE Original Filed July 28. 1949 INVENTOR. KM
United States Patent CONTROL DEVICE John L. Harris, Whitefish Bay, Wis.
Original application July 28, 1949, Serial No. 107,219. Divided and this application June 24, 1954, Serial No. 439,013
3 Claims. (Cl. 74125') This application is a division of my copending application Serial No. 107,219, filed July 28, 1949, now abancloned.
This invention relates to intermittent drive mechanisms for motor driven timers.
The primary object of the invention is to provide an intermittent drive mechanism for a timer cam shaft which serves to hold the shaft in each position and which causes the holding force to disappear for the instant the shaft is moved from one position to the next.
Other objects will appear from the following description and appended claims.
For a full disclosure of the invention, reference is made to the accompanying drawing which is a front elevation of one form of the invention.
In this drawing, the gear 38 is driven by a timer motor (not shown). This gear drives a gear 85 which, in turn, drives a cam 86. This cam operates a cam follower 87 which is held in place by a pivot pin 88 mounted on the back member 7. The cam follower is provided with inwardly extending ears having slotted holes 89 through which the pin 88 extends. The cam follower 87 is also provided with a stop section 90 which is formed to fit into notches 91 in ratchet wheel 92 which drives the cam shaft. The cam follower 87 is also pivotally attached to a pawl 93 which engages the ratchet wheel and which is biased by means of a spring 94. It will be apparent that the spring 94 pulls the pawl 93 into the ratchet wheel and also pulls the cam follower 87 into engagement with the cam 85 and the ratchet wheel 92. In operation, the cam 86 is driven in a clockwise direction and gradually rotates the cam follower about its stop end 90 which bears against the ratchet wheel. This holds the ratchet wheel and cam shaft stationary in a positive position. At this time the pawl moves backwards to engage the next notch in the ratchet wheel. When the cam follower drops off the cam, the spring 94 is free to pull the pawl 93 downwardly and thus rotate the ratchet wheel one notch. During the drop off movement of the cam follower, the reaction of the cam follower at its stop end is zero and thus there is no reactive force available at the stop end 90 of the cam follower. Thus the holding force of the cam follower on the ratchet wheel disappears during the turning movement of the ratchet wheel. However, when the cam follower strikes the bottom of the cam this reactive force immediately reappears and holds the cam shaft stationary.
Inasmuch as many vairations in form may be made without departing from the spirit and scope of the invention, it is desired to be limited only by the appended claims.
What is claimed is:
1. In a motor driven timer, the combination of, a control shaft, a ratchet wheel, a motor driven cam, a cam follower having one portion engaging said ratchet wheel for holding the same, said cam follower having another portion engaging said motor driven cam, lost motion means supporting the cam follower, a pawl arranged to engage the ratchet wheel at a point spaced from the cam follower, means for attaching the pawl to the cam follower and arranged to permit relative movement therebetween, and means for biasing the cam follower against the cam and ratchet wheel.
2. In a motor driven timer, the combination of, a control shaft, a ratchet wheel, a motor driven cam arranged for rotation and having an abrupt drop-off, a floating cam follower having one portion engaging the ratchet wheel and another portion engaging the cam, means associated with the cam follower arranged to restrain motion thereof relative to the direction of rotation of the cam at the point of engagement of the cam follower therewith, means for applying a biasing force to the cam follower between its points of engagement with the cam and ratchet wheel, whereby the holding force of the cam follower on the ratchet wheel is a function of the force of the cam follower against the cam, and a pawl operated by the cam follower for rotating the ratchet wheel.
3. In a motor driven timer, the combination of, a control shaft, ratchet wheel means on the shaft for rotating and holding the shaft from rotation, a motor driven cam having an abrupt drop-01f, a floating cam follower having one portion engaging the ratchet wheel means and another portion engaging the cam, means associated with the cam follower for restraining motion of the cam follower in a direction substantially tangential to its point of engagement with the ratchet wheel means, means for applying a biasing force to the cam follower between its points of engagement with the cam and ratchet wheel means whereby the holding force of the cam follower on the ratchet wheel means is a function of the force of the cam follower against the cam, and a pawl operated by the cam follower for rotating the ratchet wheel means when the cam followers drops off the cam.
References Cited in the file of this patent UNITED STATES PATENTS Re. 13,247 Freeman May, 30, 1911 574,223 Scribner Dec. 29, 1896 2,060,603 Ball Nov. 10, 1936 2,208,831 Basset July 23, 1940 2,214,534 Maxwell Sept. 10, 1940 2,216,597 Minneci Oct. 1, 1940 2,469,341 Pearson May 3, 1949 2,834,249 May May 13, 1958
US439013A 1949-07-28 1954-06-24 Control device Expired - Lifetime US2917933A (en)

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US10721949A 1949-07-28 1949-07-28
US439013A US2917933A (en) 1949-07-28 1954-06-24 Control device

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028458A (en) * 1959-06-24 1962-04-03 Controls Co Of America Sequence timer
US3071017A (en) * 1959-06-30 1963-01-01 Kingston Products Corp Intermittent drive for sequence switch mechanism
US3093958A (en) * 1960-04-11 1963-06-18 Ebauches Sa Watch with jump operated indicator
US3115785A (en) * 1960-10-18 1963-12-31 Mallory Timers Company Intermittent driving device for a timer mechanism
US3187594A (en) * 1962-07-11 1965-06-08 Western Electric Co Coin totalizer positive index mechanism
US3200655A (en) * 1963-09-24 1965-08-17 Gen Time Corp Snap action incremental actuator
US3237464A (en) * 1963-02-13 1966-03-01 Controls Co Of America Stepping mechanisms
US3291923A (en) * 1962-05-01 1966-12-13 Robertshaw Controls Co Sequential timer having program disc with high and low power switching means
US3319477A (en) * 1965-09-23 1967-05-16 Mallory & Co Inc P R Timer escapement
US3358519A (en) * 1965-10-23 1967-12-19 Carl A Christianson Ratchet drive
US3436976A (en) * 1967-09-25 1969-04-08 Solomon Frankel Stepping mechanism
US3465605A (en) * 1967-11-15 1969-09-09 Burroughs Corp Pawl and ratchet mechanism
US3779092A (en) * 1971-04-24 1973-12-18 Rollei Werke Franke Heidecke Film winding mechanism for motion picture apparatus
US4152954A (en) * 1977-03-21 1979-05-08 P. R. Mallory & Co. Inc. Timing mechanism with coaxial drive system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US574223A (en) * 1896-12-29 Charles e
US2060603A (en) * 1921-10-06 1936-11-10 Square D Co Protective cover for electric switches
US2208831A (en) * 1938-11-12 1940-07-23 Bendix Home Appliances Inc Intermittent drive mechanism
US2214534A (en) * 1938-05-31 1940-09-10 Charles J Maxwell Program clock
US2216597A (en) * 1938-01-15 1940-10-01 Gen Electric Time delay control system
US2469341A (en) * 1944-06-09 1949-05-03 Eagle Signal Corp Cycle timer
US2834249A (en) * 1954-09-02 1958-05-13 Leitz Ernst Gmbh Mechanism for projecting films of different widths

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US574223A (en) * 1896-12-29 Charles e
US2060603A (en) * 1921-10-06 1936-11-10 Square D Co Protective cover for electric switches
US2216597A (en) * 1938-01-15 1940-10-01 Gen Electric Time delay control system
US2214534A (en) * 1938-05-31 1940-09-10 Charles J Maxwell Program clock
US2208831A (en) * 1938-11-12 1940-07-23 Bendix Home Appliances Inc Intermittent drive mechanism
US2469341A (en) * 1944-06-09 1949-05-03 Eagle Signal Corp Cycle timer
US2834249A (en) * 1954-09-02 1958-05-13 Leitz Ernst Gmbh Mechanism for projecting films of different widths

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028458A (en) * 1959-06-24 1962-04-03 Controls Co Of America Sequence timer
US3071017A (en) * 1959-06-30 1963-01-01 Kingston Products Corp Intermittent drive for sequence switch mechanism
US3093958A (en) * 1960-04-11 1963-06-18 Ebauches Sa Watch with jump operated indicator
US3115785A (en) * 1960-10-18 1963-12-31 Mallory Timers Company Intermittent driving device for a timer mechanism
US3291923A (en) * 1962-05-01 1966-12-13 Robertshaw Controls Co Sequential timer having program disc with high and low power switching means
US3187594A (en) * 1962-07-11 1965-06-08 Western Electric Co Coin totalizer positive index mechanism
US3237464A (en) * 1963-02-13 1966-03-01 Controls Co Of America Stepping mechanisms
US3200655A (en) * 1963-09-24 1965-08-17 Gen Time Corp Snap action incremental actuator
US3319477A (en) * 1965-09-23 1967-05-16 Mallory & Co Inc P R Timer escapement
US3358519A (en) * 1965-10-23 1967-12-19 Carl A Christianson Ratchet drive
US3436976A (en) * 1967-09-25 1969-04-08 Solomon Frankel Stepping mechanism
US3465605A (en) * 1967-11-15 1969-09-09 Burroughs Corp Pawl and ratchet mechanism
US3779092A (en) * 1971-04-24 1973-12-18 Rollei Werke Franke Heidecke Film winding mechanism for motion picture apparatus
US4152954A (en) * 1977-03-21 1979-05-08 P. R. Mallory & Co. Inc. Timing mechanism with coaxial drive system

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