US3724248A - Timer - Google Patents

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Publication number
US3724248A
US3724248A US00187416A US3724248DA US3724248A US 3724248 A US3724248 A US 3724248A US 00187416 A US00187416 A US 00187416A US 3724248D A US3724248D A US 3724248DA US 3724248 A US3724248 A US 3724248A
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US
United States
Prior art keywords
ratchet
pawl
outer ratchet
ratchet wheel
advancing
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
US00187416A
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English (en)
Inventor
G Obermann
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.)
Eaton Corp
Original Assignee
Controls Company of America
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 Controls Company of America filed Critical Controls Company of America
Application granted granted Critical
Publication of US3724248A publication Critical patent/US3724248A/en
Assigned to CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE, SCHILLER PARK, IL., A CORP. OF DE. reassignment CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE, SCHILLER PARK, IL., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Assigned to EATON CORPORATION, A CORP. OF OH. reassignment EATON CORPORATION, A CORP. OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CONTROLS COMPANY OF AMERICA
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed
    • H01H43/10—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed
    • H01H43/101—Driving mechanisms
    • H01H43/102—Driving mechanisms using a pawl and ratchet wheel mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H29/00—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action
    • F16H29/02—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action between one of the shafts and an oscillating or reciprocating intermediate member, not rotating with either of the shafts
    • 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
    • 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
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1529—Slide actuator
    • 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
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1553—Lever actuator
    • Y10T74/1555—Rotary driven element
    • 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

  • ABSTRACT The outer ratchet wheel is :1 part of the timing cam drum of a step-by-step type of interval timer.
  • the outer ratchet is advanced by means of a pawl which is reciprocated as the slow rise fast drop cam rotates to retract the pawl one tooth and advance the pawl with a snap action until the pawl abuts a stop member, at which time the retaining pawl engages the same tooth to hold the cam in place.
  • the teeth are missing thereby allowing the drive pawl (and then the retaining pawl) to reach inside and engage a time delay ratchet which is then advanced inside the outer ratchet a number of steps until the inner ratchet engages the inside of the outer ratchet and starts driving the outer ratchet until the drive pawl and retaining pawl are back onto the outside ratchet, at which time the inside ratchet is released and returned to its original point by the spring bias.
  • This allows what would normally be a short interval on the outer ratchet to be stretched to provide a long interval without consuming too many steps of the timing cam.
  • Washing machine timers are classically advanced in a step-by-step manner at timed intervals.
  • the angular step of the timing cam is 7.2 (50 steps for a total revolution) or in some cases 6 (60 steps), which represents about the practical minimum for proper operation of the timer.
  • 50 or 60 steps are available in a complete revolution of the timing cam and obviously only one revolution is available since the programs then begin to repeat.
  • This invention is directed to provision of apparatus which permits stretching of selected intervals so as to considerably increase the effectiveness of the timer.
  • a desirable number of programs can still be provided on the timing cam, desirable step increments can be retained i.e. 6 or 7.2) and still the selected intervals can be substantially increased.
  • the construction described in the Abstract in effect, allows the timing cam to be parked while the stretched interval occurs. At the conclusion of the stretched interval the advance mechanism once again starts driving the timing cam. This arrangement can be provided without greatly increasing the cost of the timer.
  • FIG. 1 is a bottom plan view of the escape mechanism taken on meandering line as shown in FIG. 2.
  • FIG. 2 is a fragmentary vertical section with parts broken away showing the orientation of the stepping ratchet and time lapse ratched to the timing cam.
  • FIG. 3 is a fragmentary view showing the manner in which the drive mechanism can actuate the time lapse ratchet while the stepping ratchet remains stationary.
  • FIG. 4 is a view comparable to FIG. 3 but shows a position of the parts after the drive mechanism has returned to the stepping ratchet and the time lapse ratchet is in process of returning to its starting point.
  • the length of the drive step is determined by engagement of the end of drive pawl 14 with the stop member 22 pivoted on pivot 24 and underlying the I holding pawl 26.
  • the holding pawl is cammed out of engagement with the ratchet but as soon as the stroke is completed the large tooth on the end of the holding pawl drops into the adjacent space between the ratchet teeth to retain the ratchet in position.
  • Both the holding pawl 26 and the drive pawl 14 are biased into engagement with the ratchet teeth by a single spring 28.
  • teeth are missing at the various locations around the periphery of the stepping ratchet.
  • teeth are missing at 30, 32, 34, 36, 38 and 40. These gaps correspond to positions of the timing cam at which a long interval is desired.
  • Interval ratchet 42 is rotatably mounted on the hub 44 of the timing cam drum harbor so that it can rotate relative to the timing cam drum.
  • the spring 46 coiled around the shaft portion 48 of the inside ratchet member is connected to the ratchet member at 50 and is connected to the timing cam arbor at 52 so that the ratchet is biased in a clockwise direction (FIG. 1) to position the tooth 54 in abuting relation to the radially inwardly projecting face or portion of 56 of the outer ratchet.
  • the advancing pawl 14 has moved the outer ratchet to a position immediately adjacent the gap 36 at which time an interval would be desired.
  • the pawl next advances it will drop into the hold and hit the flat tooth 62 on the inner ratchet.
  • the antireverse pawl 26 will also land here and will restrain the outer ratchet.
  • the ratchet will slide the advance pawl back along the flat tooth 62 until it lands inthe adjacent notch in the inner ratchet and then the advance stroke will move the inside ratchet relative to the outside ratchet whereupon the anti-reverse pawl will engage the inner ratchet to hold it in its advanced position against the bias of the return spring 46.
  • the auxiliary anti-reverse pawl 64 holds the outer ratchet. During this step it is obvious that no movement of the outer ratchet occurred and hence the timing cam remains stationary. Thus it is now necessary to advance the inner ratchet relative to the outer ratchet until such time as the lug 58 engages face 60 to pick up the outer ratchet and transfer advance motion to the outer ratchet and hence the timing cam. This will, of course, force the advance pawl and the anti-reverse pawl to rise up and start operating on the stepping ratchet. Upon release of the inner ratchet, the return spring 46 returns it to its starting point so that the full stretched interval will be available when next the timer is advanced to a position where along interval is desired. As shown, that next position would be adjacent tooth 66 and the next movement of the advance pawl would drop down into notch 68 on the inner ratchet.
  • FIG. 3 shows the position of the advance mechanism while it is driving the inside ratchet relative to the outside ratchet. This also illustrates the manner in which the holding pawl operates on both ratchets during the stretched interval phase of operation.
  • FIG. 4 illustrates the position in parts after the mechanism has returned to the outer ratchet and (with some artistic license) the inner ratchet is shown in the process of returning to its zero point.
  • a stepping mechanism including an advance pawl engageable with the ratchet wheel to advance the ratchet wheel in a step-by-step manner to sequential positions determining the position of the program timing cam, some of the teeth of the ratchet being omitted in at least one position on the periphery of the ratchet so as to leave a gap through which the advancing pawl may project inwardly, second ratchet wheel positioned inside the first with teeth underlying the gap in the outer ratchet wheel whereby the advancing pawl will operate through the said gap onto the inner ratchet wheel and advance it in a step-bystep manner,
  • said inner ratchet wheel being biased to an initial position and being rotatably relative to the outer ratchet wheel to a second position in which the inner and outer ratchet wheels become engaged and move in unison whereby the timing cam remains stationary during such period as the advancing pawl is advancing the inner ratchet relative to the outer ratchet and upon the two ratchets becoming interengaged the advance pawl returns to the outer ratchet and is disengaged from thejnner ratchet which then returns 0 its initial position under influence of its sprm g bias.
  • a timer according to claim 1 including holding means operative to engage said outer ratchet during each back step movement of the advancing pawl and thereby prevent movement of the program timing cam in the interval between the advancing steps,
  • second holding means operative on said inner ratchet wheel to retain it in its advanced position relative to the outer ratchet 'wheel during the interval between advancing steps imparted to the inner ratchet wheel.
  • the other holding pawl being an auxiliary pawl which engages the outer ratchet while the first holding pawl engages the inner ratchet.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Measurement Of Predetermined Time Intervals (AREA)
US00187416A 1971-10-07 1971-10-07 Timer Expired - Lifetime US3724248A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18741671A 1971-10-07 1971-10-07

Publications (1)

Publication Number Publication Date
US3724248A true US3724248A (en) 1973-04-03

Family

ID=22688890

Family Applications (1)

Application Number Title Priority Date Filing Date
US00187416A Expired - Lifetime US3724248A (en) 1971-10-07 1971-10-07 Timer

Country Status (6)

Country Link
US (1) US3724248A (2)
JP (1) JPS4845789A (2)
CA (1) CA948246A (2)
DE (1) DE2246985A1 (2)
FR (1) FR2156076B3 (2)
IT (1) IT968580B (2)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179945A (en) * 1978-09-05 1979-12-25 The Singer Company Variable step size impulse drive
US4222291A (en) * 1978-06-12 1980-09-16 Murphy Jr Patrick J Conical roller chain indexing device
US4467664A (en) * 1981-09-28 1984-08-28 The Singer Company Timer drive mechanism
US4563911A (en) * 1982-01-29 1986-01-14 Societe Industrielle De Bellevaux Sibel Programmer control device
US4577179A (en) * 1982-04-15 1986-03-18 Eaton Corporation Programmer/timer for appliances
US4622145A (en) * 1982-11-29 1986-11-11 Bratten Jack R Drum filter
US4649239A (en) * 1985-10-04 1987-03-10 Eaton Corporation Program timer with variable time delay
US5780791A (en) * 1997-02-24 1998-07-14 Emerson Electric Co. Timer for controlling an appliance having a plurality of pawls which rotate a camstack
US20190368745A1 (en) * 2018-06-04 2019-12-05 Harmonious International Ltd. Oven rotisserie
US12532930B1 (en) * 2025-08-05 2026-01-27 Landau International Holdings LLC Stabilized weight lifting belt

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2746311A1 (de) * 1977-10-14 1979-04-26 Eaton Corp Programmschaltwerk fuer eine waschmaschine
DE2806258C2 (de) * 1978-02-15 1987-01-22 Eaton GmbH, 7778 Markdorf Programmschaltwerk für Waschmaschinen, Geschirrspülmaschinen od.dgl.
DE3608367A1 (de) * 1986-03-13 1987-09-17 Ako Werke Gmbh & Co Antriebseinrichtung eines programmschaltwerks

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190317577A (en) * 1903-08-13 1903-12-17 Graaff & Co G M B H Adjustable Pawl Wheel Gear
US3115785A (en) * 1960-10-18 1963-12-31 Mallory Timers Company Intermittent driving device for a timer mechanism
US3149591A (en) * 1961-02-09 1964-09-22 Aichi Kogyo Kabushiki Kaisha Buttonhole stitching device in zigzag sewing machines
US3395585A (en) * 1965-10-24 1968-08-06 Controls Co Of America Timer indexing mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190317577A (en) * 1903-08-13 1903-12-17 Graaff & Co G M B H Adjustable Pawl Wheel Gear
US3115785A (en) * 1960-10-18 1963-12-31 Mallory Timers Company Intermittent driving device for a timer mechanism
US3149591A (en) * 1961-02-09 1964-09-22 Aichi Kogyo Kabushiki Kaisha Buttonhole stitching device in zigzag sewing machines
US3395585A (en) * 1965-10-24 1968-08-06 Controls Co Of America Timer indexing mechanism

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222291A (en) * 1978-06-12 1980-09-16 Murphy Jr Patrick J Conical roller chain indexing device
US4179945A (en) * 1978-09-05 1979-12-25 The Singer Company Variable step size impulse drive
US4467664A (en) * 1981-09-28 1984-08-28 The Singer Company Timer drive mechanism
US4563911A (en) * 1982-01-29 1986-01-14 Societe Industrielle De Bellevaux Sibel Programmer control device
US4577179A (en) * 1982-04-15 1986-03-18 Eaton Corporation Programmer/timer for appliances
US4622145A (en) * 1982-11-29 1986-11-11 Bratten Jack R Drum filter
US4649239A (en) * 1985-10-04 1987-03-10 Eaton Corporation Program timer with variable time delay
US5780791A (en) * 1997-02-24 1998-07-14 Emerson Electric Co. Timer for controlling an appliance having a plurality of pawls which rotate a camstack
US20190368745A1 (en) * 2018-06-04 2019-12-05 Harmonious International Ltd. Oven rotisserie
US12442538B2 (en) * 2018-06-04 2025-10-14 Harmonious International Ltd. Oven rotisserie
US12532930B1 (en) * 2025-08-05 2026-01-27 Landau International Holdings LLC Stabilized weight lifting belt

Also Published As

Publication number Publication date
FR2156076B3 (2) 1974-10-31
CA948246A (en) 1974-05-28
FR2156076A1 (2) 1973-05-25
DE2246985A1 (de) 1973-04-12
IT968580B (it) 1974-03-20
JPS4845789A (2) 1973-06-29

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Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

AS Assignment

Owner name: CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:004505/0515

Effective date: 19860110

AS Assignment

Owner name: EATON CORPORATION, EATON CENTER, 1111 SUPERIOR AVE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONTROLS COMPANY OF AMERICA;REEL/FRAME:004614/0433

Effective date: 19861002