US3484804A - Device for transforming an oscillating motion into a unidirectional rotation - Google Patents

Device for transforming an oscillating motion into a unidirectional rotation Download PDF

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Publication number
US3484804A
US3484804A US786655A US3484804DA US3484804A US 3484804 A US3484804 A US 3484804A US 786655 A US786655 A US 786655A US 3484804D A US3484804D A US 3484804DA US 3484804 A US3484804 A US 3484804A
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US
United States
Prior art keywords
wheel
pawl
transforming
axis
teeth
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
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US786655A
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English (en)
Inventor
Jean Hermann
Daniel Paratte
Max Forrer
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Centre Electronique Horloger SA
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Centre Electronique Horloger SA
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Publication date
Application filed by Centre Electronique Horloger SA filed Critical Centre Electronique Horloger SA
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    • 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
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C13/00—Driving mechanisms for clocks by primary clocks
    • G04C13/08—Secondary clocks actuated intermittently
    • G04C13/10—Secondary clocks actuated intermittently by electromechanical step advancing mechanisms
    • 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
    • Y10T74/18056—Rotary to or from reciprocating or oscillating

Definitions

  • the present invention concerns a device for transforming an oscillating motion into a unidirectional rotation.
  • the transforming devices provided with a pawl have the disadvantage of requiring a second pawl to prevent a return motion of the driven wheel, since the wheel is locked in one direction only by the positioning pawl, which allows this wheel to advance accidentally under the influence of too great an impulse received from the driving pawl or owing to the effect of a shock when the same pawl is in its position of rest.
  • the anchor transforming devices have nearly radial engagement with the driven wheel, i.e. nearly perpendicular to the motion of the wheel, which causes considerable friction and consequently a low efiiciency.
  • the present invention enables the abovementioned disadvantages to be remedied. It consequently concerns a device for transforming an oscillating motion into a unidirectional rotation, comprising two members connected to a support mounted to oscillate around an axis and arranged on this support in such a manner as to alternatively engage in the teeth of a wheel for driving the latter step-by-step, characterized in that the wheel has an odd number of teeth, and in that the trajectory of each one of the members intersects the outer circumference of the wheel in two points the connecting radii of which form in the centre of the wheel an angle which is practically equal to the pitch of the teeth, the chords respectively connecting the points of intersectoin of the circumference with the trajectory of each one of the members being perpendicular to a common diameter of this wheel.
  • FIG. 1 is a side view, partly in cross section, of a transforming device of the invention incorporated in a horological mechanism.
  • FIGS. 2 and 4 are schematic plan views of the transforming device of FIGURE 1.
  • FIG. 5 is a schematic end view of the transforming device of FIG. 1, showing the wheel 14 and the relative angular positions of the pawls 12 and 13.
  • FIGS. 6 and 7 are schematic plan views of another embodiment.
  • FIG. 8 is a perspective view of a variant of the embodiment shown in FIGS. 1 to 5.
  • FIGS. 9 to 11 are plan views of another variant.
  • FIG. 12 is a view in elevation schematically showing the resilient parts illustrated in FIGS. 9 to 11.
  • the horological mechanism shown in FIG. 1 comprises a motor 1 oscillating around an axis 2 parallel to the upper and lower faces of the movement, respectively 3 and 4.
  • the movable armature of the motor comprises a coil 5 in the shape of a frame secured by means of an adhesive in two recesses 6 and 7 respectively formed in the inner ends of two rods 8 and 9 coaxial with the axis 2, and the outer ends of which are pivoted in bearings 10 and 11, respectively.
  • the rod 8 carries two rigid-armed pawls 12 and 13 secured to this rod and the free ends of which are arranged on either side of a wheel 14 pivoted around an axis 15 which is perpendicular to and in the same plane as the axis 2 of the motor 1.
  • This wheel 14 is connected by its pinion 16 to the demultiplicating gear train of the indicating hands as in the classical horological mechanisms.
  • the wheel 14 is provided with ratchet teeth.
  • the two pawls 12 and 13 describe around and axis of oscillation 2 two planes parallel to the axis of rotation 15 of the wheel 14 which intersects the outer circumference of the wheel, as defined by the tips of the teeth, along a chord, joining the tips of two adjacent teeth.
  • a tooth is always diametrically opposite to a gap.
  • the two pawls 12 and 13 occupy a predetermined angular position in relation to one another around the axis 2.
  • each pawl intersects the outer circumference of the Wheel 14 at two points, such that the radial lines drawn therethrough define an angle substantially equal to the pitch of the wheel teeth.
  • the two chords thus defined by the movement of the pawls are perpendicular to a common diameter of the wheel.
  • the core of the armature coil 5 extends between the two inner ends of the rods 8 and 9, and can be considered an extension or part of the rod 8.
  • the face of the pawl 12 rests against the tops of two teeth of the wheel 14 which is thus angularly positioned.
  • the pawls 12 and 13 which were rotating in the direction of the arrow F around the axis 2 have arrived the end of their travel in the position shown in this figure and are at the beginning of a rotation in the opposite direction F1.
  • the pawl 12 is first disengaged from the wheel 14 as shown in FIG. 3 and the pawl 13 comes into contact with a tool of the wheel 14 which is diametrically opposite to the chord joining the two adjacent teeth resting against the face of the pawl 12.
  • FIGS. 6 and 7 the principle of operation is identical with that of the FIGS. 2 to 5.
  • This embodiment differs from the preceding one by the fact that the axes and 17 respectively of the wheel 14 and the oscillator are parallel.
  • the pawls 18 and 19 are consequently no longer axially spaced around the axis of oscillation, but are concentric with this axis.
  • the radii separating the pawls 18 and 19 from the axis of rotation are dilferent, the angular distribution of the contact of the teeth with each of the arms is consequently no longer identical.
  • the advance of the wheel 14 is effected in the same way as described above, but the positioning is no longer obtained by means of a plane surface but by means of the arcs of circles of the arms of the pawls 18 and 19 which are concentric with the axis of oscillation 17.
  • FIG. 8 A variant of the first embodiment is illustrated in FIG. 8 in which the pawls 12 and 13 are secured to a movable frame 20 forming part of an electro-dynamic driving system.
  • This part 20 and the pawls 12 and 13 can be obtained in the shape of a single moulding which leads to an extremely simple practical solution.
  • each pawl 12 and 13 is provided at its driving end with a resilient part 21 and 22 respectively which may be constituted by various means. The operation illustrated in thesefigures and in particular in FIG.
  • FIG. 12 illustrates an embodiment for obtaining the resilient zones 21 and 22.
  • Two springs 23 and 24 are secured at, or near to, the base of each pawl in such a manner as to create a resilient contact between the wheel 14 and the pawls 12 and 13.
  • Device for transforming and oscillating motion into a unidirectional rotation comprising a toothed wheel mounted free to rotate, the tips of the teeth thereof defining a wheel outer circumference, a support mounted to oscillate about an axis, two members on said support and moving therewith for alternately engaging the teeth of said wheel to drive the latter step-by-step in one direction, and wherein the improvement comprises that said wheel incorporates an odd number of teeth, and that the path of movement of each of said two members intersects said wheel outer circumference at two points the radial lines of which define an angle substantially equal to the pitch of the wheel teeth, and wherein the respective chords connecting the two intersections of the path of movement of each said member with the said wheel outer circumference are perpendicular to a common diameter of said wheel, whereby each said member locks said wheel, at respectively different times, against return movement for a part of each complete oscillation of said support.
  • each said member projects from said support, and said resilient means are each a springy strip secured at, or near to, the base of a respective said member and which diverges from its member in the direction of the end thereof remote from said support.
  • each said member is a pawl.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US786655A 1968-02-16 1968-12-24 Device for transforming an oscillating motion into a unidirectional rotation Expired - Lifetime US3484804A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH228268A CH508907A (fr) 1968-02-16 1968-02-16 Mécanisme d'entraînement pas à pas pour pièce d'horlogerie et utilisation de ce mécanisme

Publications (1)

Publication Number Publication Date
US3484804A true US3484804A (en) 1969-12-16

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US786655A Expired - Lifetime US3484804A (en) 1968-02-16 1968-12-24 Device for transforming an oscillating motion into a unidirectional rotation

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US (1) US3484804A (cs)
CH (2) CH228268A4 (cs)
DE (1) DE1903880B2 (cs)
FR (1) FR1587289A (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844104A (en) * 1972-04-08 1974-10-29 Itt Electromechanical transducer for watches
US4308199A (en) * 1980-01-17 1981-12-29 The Goodyear Tire & Rubber Company Mercaptophenol derivatives as age resisters for polymers
USRE32618E (en) * 1980-01-17 1988-03-01 The Goodyear Tire & Rubber Company Mercaptophenol derivatives as age resisters for polymers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570170A (en) * 1949-03-19 1951-10-02 Gen Electric Compound escapement with spring mounted mass
US3351788A (en) * 1966-02-01 1967-11-07 Movado Montres Apparatus for mechanically converting the oscillating movement of an electro-mechanical oscillator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570170A (en) * 1949-03-19 1951-10-02 Gen Electric Compound escapement with spring mounted mass
US3351788A (en) * 1966-02-01 1967-11-07 Movado Montres Apparatus for mechanically converting the oscillating movement of an electro-mechanical oscillator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844104A (en) * 1972-04-08 1974-10-29 Itt Electromechanical transducer for watches
US4308199A (en) * 1980-01-17 1981-12-29 The Goodyear Tire & Rubber Company Mercaptophenol derivatives as age resisters for polymers
USRE32618E (en) * 1980-01-17 1988-03-01 The Goodyear Tire & Rubber Company Mercaptophenol derivatives as age resisters for polymers

Also Published As

Publication number Publication date
CH228268A4 (cs) 1971-02-26
DE1903880B2 (de) 1971-04-22
CH508907A (fr) 1971-02-26
DE1903880A1 (de) 1969-09-18
FR1587289A (cs) 1970-03-13

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