US3733917A - Pawl and ratchet device - Google Patents

Pawl and ratchet device Download PDF

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Publication number
US3733917A
US3733917A US00081665A US3733917DA US3733917A US 3733917 A US3733917 A US 3733917A US 00081665 A US00081665 A US 00081665A US 3733917D A US3733917D A US 3733917DA US 3733917 A US3733917 A US 3733917A
Authority
US
United States
Prior art keywords
support member
ratchet
axis
holding pawl
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
US00081665A
Other languages
English (en)
Inventor
F Nikles
R Besson
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.)
Centre Electronique Horloger SA
Original Assignee
Centre Electronique Horloger SA
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 Centre Electronique Horloger SA filed Critical Centre Electronique Horloger SA
Application granted granted Critical
Publication of US3733917A publication Critical patent/US3733917A/en
Anticipated expiration legal-status Critical
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
    • 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
    • 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
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1558—Grip units and features

Definitions

  • the holding pawl of a pawl and ratchet device is independantly adjustable for phase and pressure on a ratchet.
  • a fork-like support carrying the holding pawl can be translationally moved to bring the pawl into engagement with a ratchet.
  • the support is then pivoted about the axis of the ratchet by elastic deformation of an arm of the support. Displacement and pivoting of the support is effected by pressure on converging bearing surfaces on the arms of the support.
  • the holding pawl is pivotally friction mounted on the support to enable adjustment of its pressure on the ratchet.
  • the invention concerns a device for transforming an oscillating movement into unidirectional movement comprising a ratchet rotatably. mounted aboutan'axis perpendicular to a fixed plate, and Ya driving pawl and a holding pawl for cooperation with the ratchet.
  • This device comprises, incombination:
  • a support member carrying the holding pawl the support member being movably mounted on the fixed plate by means permitting rotational movement of the support member about an axis of the ratchet and translational movement of the support member relative to said axis between a firstpositionand a second position.
  • the said mountingmeans comprise an arcuate bearing surface coaxial with said axis for contact between the plate and the support member when in the second position;
  • the moving means comprises first and second abutment surfaces on the support member, thefirst and second surfaces converging in the direction of said axis, and ad justable abutment means on the fixed plate, for outwardly urging the first andsecond abutment surfaces to provide a resultant force on the support member in the direction of said axis;
  • phase adjusting means comprises an elastically deformable section of the support member arranged so thatwhen the support member is in the second positionadjustment of the moving means to outwardly urge thefirst and second abutment surfaces causes pivoting of a part of thesupport member and the holding pawl about said axis by elastic deformation of said section;
  • iv. means for adjusting the angular location of the holding pawl on the support member to therebyenable adjustment of the pressure of the holding pawl on the ratchet.
  • FIG. 1 of the accompanying drawings schematically shows, by way of example, an embodiment of the invention.
  • FIG. 2 shows the deviceillustrated in FIG. 1 in anv electro-mechanical watch movement.
  • FIG. 3 is a view of the lower portion of the device illustrated in FIG. 1, however, showing an adjustable abutment eccentric.
  • a holding pawl 2 is fixed on a mobile support member 1 having two arms 24 and 25.
  • the support member is in a resilient material so that the arm 24 can be flexed about an elastically deformable section 24'.
  • the arm 24 has an abutment surface 26 bearing against a pin 27 fixed on a plate 28 of a gear-train bridge carrying a ratchet wheel 20.
  • the arm 25 also has an abutment surface 29 hearing against an adjustment screw 30.
  • the abutment surfaces 26 and 29 are flat and inclined relative to one another.
  • the adjustment screw 30 is transversally mounted on an adjusting stop 31 fixed on the plate 28 and axially slotted to enable clamping of the screw 30.
  • the support member 1 carries a pivoting axle 33 engaging in an oblong slot 32 in the plate 28.
  • the slot 32 terminates with a semi-cylindrical bearing surface 32' coaxial .with the axis of the ratchet wheel so that when the axle 33 bears against the surface 32' it is coaxial with the ratchet 20.
  • the support member 1 By screwing the regulating screw 30 in the stop 31, the support member 1 is displaceduntil the axle 33 arrives at the end of the oblong hole 32, i.e., against the semi-cylindrical surface 32' which serves as a bearing.
  • the arm 25 of support member 1 pivots about the axle 33, which thus enables an adjustment of the phase of the holding pawl 2 in relation to a driving pawl, not shown, which driving pawl can be located at any convenient location of the periphery of the ratchet.
  • the elastic deformation of section24' of the arm 24 ensures that this adjustment is carried out free of play.
  • a foil-like washer 34 fixed on the support 1 by a screw 35 screwed into the plate 28 exerts a permanent perpendicular pressure on the support 1,,hence eliminating any play in this direction between the support 1 and the plate 28.
  • the screw 35 is of smaller diameter than an aperture (not shown) in the member l through which it passes, whilst the washer 34 is of greater dimensions than this aperture.
  • the supportmember l is thus allowed sufficient angular play to pivot in relatio to the plate 28 about axle 33.
  • the pin 36 which is friction mounted by an axle 10 in a hole in the support 1, is angularly adjusted about the axle 10.
  • FIG. 2 shows an electro-mechanical watch movement-having the inventive device therein, although the device might be used in any suitable movement.
  • the device is located in the midst of a watch movementwhich includes hand setting mechanism 40, battery 41, quartz crystal 42 extending between a condenser for frequency adjustment 43, and electrical circuitry which is represented by enclosure 44.
  • Resonator or motor 45 has oscillating arm 46 extending therefrom and driving pawl 47 is attached to oscillating arm 46.
  • Driving pawl 47 is shown in engagement with ratchet wheel 20 which is also engaged by holding or returning pawl 2, as already described in conjunction with FIG. 1. It will'be appreciated that the device described in detail in FIG. 1 and shown in the movement illustrated in FIG.
  • ratchet and pawl mechanism in timepieces may be installed while disengaged, and after installation, engaged by the turning movement of an adjustment screw 30.
  • the installation of such a driving mechanism often resulted in damage to its delicate parts.
  • the adjustable abutment means for acting against the surface 29 could comprise an eccentric.
  • an eccentric surface 37 attached to adjustment screw 30 may engage abutment surface 29 on arm 26 of the moble support member 1.
  • the remainder of the device may be substantially as illustrated in FIG. 1, and adjustment of the device to engage a ratchet and pawl is accomplished by turning the adjustment screw 30.
  • pivoting axle could be carried by the plate whilst the support member would be slotted; in such a variant, the arcuate bearing surface would be that opposite surface 32' as shown.
  • a device for transforming an oscillating movement of a driving pawl into unidirectional movement comprising: a ratchet rotatably mounted about an axis perpendicular to a fixed plate, and a driving pawl for cooperation with the ratchet;
  • a support member carrying a holding pawl for engaging the ratchet the support member being movably mounted on the fixed plate by means permitting rotational movement of the support member about the axis of the ratchet and translational movement of the support member relative to said axis between a first position and a second position, said mounting means comprising an arcuate bearing surface coaxial with said axis for contact between the plate and the support member when in the second position;
  • said moving means comprising first and second abutment surfaces on the support member, the first and second surfaces converging in the direction of said axis, and adjustable abutment means on the fixed plate for outwardly urging the first and second abutment surfaces to provide a resultant force on the support member in the direction of said axis;
  • said adjustable abutment means selected from the group consisting of: (I) an eccentric rotatably mounted on the plate, and (2) a screw mounted transversely in a stop member mounted on the plate;
  • said adjusting means comprising an elastically deformable 6 the first and second abutment surfaces causes pivoting of a part of the support member and the holding pawl about said axis by elastic deformation of said section; and means for adjusting the angular location of the holding pawl on the support member for adjusting the pressure of the holding pawl on the ratchet.
  • a device for transforming an oscillating movement of a driving pawl into unidirectional movement comprising:
  • a ratchet rotatably mounted about an axis perpendicular to a fixed plate
  • a support member carrying a holding pawl for engaging the ratchet the support member being movably mounted on the fixed plate by means permitting rotational movement of the support member about the axis of the ratchet and translational movement of the support member relative to said axis between a first position and a second position, said mounting means comprising an arcuate bearing surface coaxial with said axis for contact between the plate and the support member when in the second position;
  • said moving means comprising first and second abutment surfaces on the support member, the first and second surfaces converging in the direction of said axis, and an eccentric adjustable abutment means on the fixed plate for outwardly urging the first and second abutment surfaces to provide a re-.
  • a device for transforming an oscillating movement of a driving pawl into unidirectional movement comprising:
  • a ratchet rotatably mounted about an axis perpendicular to a fixed plate
  • a support member carrying a holding pawl for engaging the ratchet the support member being movably mounted on the fixed plate by means permitting rotational movement of the support member about the axis of the ratchet and translational movement of the support member relative to said axis between a first position and a second position, said mounting means comprising an arcuate bearing surface coaxial with said axis for contact between the plate and the support member when in the second position;
  • said mounting means comprising a slot in the fixed plate terminating with a semicylindrical bearing surface coaxial with said axis when said support member is in said second position, and an axle on the support member engaging in the slot, the said resultant force on the support member urging the axle towards said bearing surface;
  • a support member carrying a holding pawl for engaging the ratchet the support member being movably mounted on the fixed plate by means permitting rotational movement of the support member about deformation of said section; and means for adjusting the angular location of the holding pawl on the support member for adjusting the pressure of the holding pawl on the ratchet.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission Devices (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Pinball Game Machines (AREA)
US00081665A 1969-10-21 1970-10-19 Pawl and ratchet device Expired - Lifetime US3733917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1573969A CH531735A (fr) 1969-10-21 1969-10-21 Dispositif de transformation d'un mouvement oscillant en un mouvement unidirectionnel applique à une roue à rochet dans un mécanisme d'horlogerie

Publications (1)

Publication Number Publication Date
US3733917A true US3733917A (en) 1973-05-22

Family

ID=4411537

Family Applications (1)

Application Number Title Priority Date Filing Date
US00081665A Expired - Lifetime US3733917A (en) 1969-10-21 1970-10-19 Pawl and ratchet device

Country Status (5)

Country Link
US (1) US3733917A (fr)
JP (1) JPS4840431B1 (fr)
CH (2) CH1573969A4 (fr)
DE (1) DE2051483C3 (fr)
FR (1) FR2064452B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867850A (en) * 1973-03-31 1975-02-25 Forster Fa Bernhard Shifting mechanism and watch
US20180231934A1 (en) * 2017-02-13 2018-08-16 Rolex Sa Horology pawl system
RU2699924C1 (ru) * 2017-11-24 2019-09-11 Бланпэн Са Часовой подвижный узел с однонаправленным зубчатым колесом

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5926952U (ja) * 1982-08-10 1984-02-20 栗山　周次郎 ビニ−ルハウスの複被装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867850A (en) * 1973-03-31 1975-02-25 Forster Fa Bernhard Shifting mechanism and watch
US20180231934A1 (en) * 2017-02-13 2018-08-16 Rolex Sa Horology pawl system
US10890877B2 (en) 2017-02-13 2021-01-12 Rolex Sa Horology pawl system
RU2699924C1 (ru) * 2017-11-24 2019-09-11 Бланпэн Са Часовой подвижный узел с однонаправленным зубчатым колесом

Also Published As

Publication number Publication date
CH1573969A4 (fr) 1972-08-31
DE2051483A1 (de) 1971-05-06
DE2051483B2 (de) 1973-04-26
CH531735A (fr) 1972-12-15
FR2064452A1 (fr) 1971-07-23
DE2051483C3 (de) 1973-11-15
FR2064452B1 (fr) 1974-06-21
JPS4840431B1 (fr) 1973-11-30

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