US3869930A - Step-by-step device for a ratchet-wheel - Google Patents

Step-by-step device for a ratchet-wheel Download PDF

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US3869930A
US3869930A US383064A US38306473A US3869930A US 3869930 A US3869930 A US 3869930A US 383064 A US383064 A US 383064A US 38306473 A US38306473 A US 38306473A US 3869930 A US3869930 A US 3869930A
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cup
shaped member
pawl
resilient means
closed end
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US383064A
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Edmond Forest
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Reveils Bayard SA
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Reveils Bayard SA
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C13/00—Driving mechanisms for clocks by master-clocks
    • G04C13/08—Slave-clocks actuated intermittently
    • G04C13/10—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/066—Electromagnets with movable winding
    • 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

Definitions

  • a step-by-step drive device for a ratchet wheel acting through a pawl comprising a coil wound on a cylindrical cup-shaped member displaceable in a magnetic field produced by a fixed ferrite core with a cylindrical armature. A clearance of several microns is determined by a'toroidal ring of low-friction and lowdensity material. A damping member is interposed between the closed end of the cup-shaped member and the circular front surface of the cylindrical armature.
  • the pawl may be directly connected to the cupshaped member or through a weighted lever having one arm connected to the pawl and the other connected to the closed end of the cup-shaped member.
  • An object of the present invention is a.step by-step drive device for a ratchet-wheel acting through a pawl, comprising a coil connected to a source of electric pulses and wound on a movable cylindrical cup-shaped member, the closed end of the cup-shaped support being connected to the pawl, a cylindrical armature with a fixed ferrite core engaging said cup-shaped member, said ferrite core forming an annular magnetic field surrounding the said coil, a guide member for the cup-shaped support formed as a toroidal ring of lowfriction low-density material forming one piece with the cup-shaped member and defining a clearance of several microns with said cylindrical armature, a damping member interposed between the closed end of the cup-shaped member and the circular front'surface of the cylindrical armature and a spring for returning the cup-shaped member to its rest position.
  • Such a device combines a high electro-magnetic efficiency with the simplicity of a ratchet-wheel.
  • FIG. 1 is a schematic showing of a first embodiment v ofthe step-by-step drive device for a ratchet-wheel ac- DESCRIPTION OF PREFERRED EMBODIMENTS
  • the device of FIG. 1 comprises a ratchet-wheel 1 driven by a pawl 2 which is by one end fixed to the closed end 3 of a cylindricalcup-shaped member 4.
  • the other end of the pawl 2 slides in a bearing 5 and cooperates with a fixed abutment 6.
  • the cup-shaped member 4 carries an aluminum coil 7 connected to a source of electric pulses (not shown).
  • the cup-shaped member 4 is fitted on to a cylindrical carbon steel armature 8 connected by a suitable bridging portion 9 to an annular ferrite core 10 to the coil 7.
  • a spiral spring 11 is arranged coaxially with the cup-shaped member.
  • Such a spring which is preferably of nickel silver is shown in more detail in FIG. 2.
  • a toroidal ring guide member 12 formed of low-friction low-density material. Between the guide member 12, and the armature 8 is a clearance of several microns.
  • a Neoprene R pad fixed to the circular front face of the armature 8 protrudes towards the closed end 3 of the cup-shaped member and acts as a damping member for the cup-shaped member 4.
  • the cup-shaped member With each electric pulse received by the coil 7 which is placed in the magnetic field provided by the radially magnetized ferrite core 10, the cup-shaped member is attracted towards the armature 8 until the closed end 3 of the cup-shaped member comes into contact with the bumper pad 13. In addition to the damping effect due to the pad 13, there is a damping effect due to the air contained in the cup-shaped member 4 during the sliding of the latter.
  • the spring 11 returns the cup-shaped member and the pawl 2 to the position shown in FIG. 1 where the end of the pawl 2 comes in contact with the abutment 6.
  • the parts similar to those shown in FIG. 1 are provided with the same, but primed numerals.
  • the radial magnetic field surrounding the coil 7' is obtained by a ferrite core 15 forming one piece with the armature 8 a cup-shaped member 16 is associated with the ferritecore 15 and another cup-shaped member 4 is received inside the cup-shaped member 16.
  • a weighted lever 17 is interposed between the pawl 2 and the closed end 3' of the cup-shaped member 4.
  • the weighted lever 17 is adapted to pivot about a fixed pivot 18.
  • One of the arms ofthe lever 17 carries a counterweight 19 and is connected to the pawl 2' the other arm is connected by a link 20 to the closed end 3 of the cup-shaped member.
  • a spring 21 corresponding to the return spring 11 of the device of FIG. 1 is biased to return the weighted lever 17 to its centered position.
  • the device of FIG. 3 is shown in its rest position, i.e., in the absence of pulses applied to the coil.
  • the two devices described above are characterized by an axial clearance of the pawl (2 or 2) defined by the abutments and therefore by the impossibility of turning the ratchet wheel 1 or 1' one or more teeth as is possible with known step-by-step drive devices.
  • the device according to the invention may be used in situation in which displacements proportional to the number of electric pulses is to be obtained.
  • the invention is particularly applicable to clock and watch making, especially quartz-crystal watches and clocks.
  • a step-by-step drive device for a ratchet-wheel acting through a pawl said drive device comprising a movable cylindrical cup-shaped member having a closed end mechanically connected to the pawl, a coil connected to a source of electric pulses wound on said movable cup-shaped member, a cylindrical armature of a fixed ferrite core received in said cup-shaped member,'said ferrite core forming an'annular magnetic field surrounding said coil, a combined guide member and sealing'ring for the cup-shaped member formed as a [toroidal] ring of low-friction[,] low-density material fixed to the cup-shaped member and defining a clearance of several microns between the cylindrical armature arid the [cup-shaped] combined guide member andsealing ring, said.
  • the ferrite core is annular and produces the magnetic field surrounding the cup-shaped member, said pawl being fixed directly to the closed end of the cup-shaped member, and further comprising a bearing associated with an abutment, said resilient means being formed as an elastic diaphragm [such as a spiral spring mounted] coaxially with and [out-side] outside the cup-shaped member between the cup-shaped member and the [armature] ferrite core.
  • a device wherein the pawl is connected to the closed end of the cup-shaped member through a weighted lever, one arm of the weighted lever being connected to the pawl and the other arm of the weighted lever being connected to the closed end of the cup-shaped member, said weighted lever having a counter-balancing weight, the resilient means being arranged to return the weighted .lever to its centered position.
  • a device wherein the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.
  • a device where the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.
  • a device according to claim 2 wherein said resilient means is a spiral spring.
  • said resilient means is a spiral spring, said spring including inner and outer annular rings, and spiral elements joining together said rings.
  • said resilient means is a spiral spring, said spring including inner and outer annular rings, and spiral elements joining together saidrings.
  • a device wherein the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnets (AREA)

Abstract

A step-by-step drive device for a ratchet-wheel acting through a pawl. The device comprises a coil wound on a cylindrical cupshaped member displaceable in a magnetic field produced by a fixed ferrite core with a cylindrical armature. A clearance of several microns is determined by a toroidal ring of low-friction and low-density material. A damping member is interposed between the closed end of the cup-shaped member and the circular front surface of the cylindrical armature. The pawl may be directly connected to the cup-shaped member or through a weighted lever having one arm connected to the pawl and the other connected to the closed end of the cup-shaped member.

Description

United States Patent [191 Forest STEP-BY-STEP DEVICE FOR A RATCHET-WI-IEEL [75] Inventor: Edmond Forest,'
Saint-Nicolas-DAliermongfrance [73] Assignee: Societe Anonyme: Reveils Bayard,
Saint-Nicolas DAliermont, France 221 Filed: July 27,1973 21 Appl. No.: 383,064
[30] Foreign Application Priority Data [111 3,869,930 1 Mar. 11, 1975 Primary Examiner-Wesley S. Ratliff, Jr. Attorney, Agent, or Firm-Baldwin, Wight & Brown 57 1 ABSTRACT I A step-by-step drive device for a ratchet wheel acting through a pawl. The device comprises a coil wound on a cylindrical cup-shaped member displaceable in a magnetic field produced by a fixed ferrite core with a cylindrical armature. A clearance of several microns is determined by a'toroidal ring of low-friction and lowdensity material. A damping member is interposed between the closed end of the cup-shaped member and the circular front surface of the cylindrical armature. The pawl may be directly connected to the cupshaped member or through a weighted lever having one arm connected to the pawl and the other connected to the closed end of the cup-shaped member.
10 Claims, 3 Drawing Figures Great Britain 74/128 1 STEP-BY-STEP DEVICE FOR A RATCHET-WHEEL BACKGROUND OF THE INVENTION pawl. A step-by-step rotary motor is also known which associates one or more pair of poles creating a greater or lesser step per revolution. The first of these devices has the disadvantage of a low efficiency, and the second is very complicated.
SUMMARY OF THE INVENTION The following device avoids the above drawbacks.
An object of the present invention is a.step by-step drive device for a ratchet-wheel acting through a pawl, comprising a coil connected to a source of electric pulses and wound on a movable cylindrical cup-shaped member, the closed end of the cup-shaped support being connected to the pawl, a cylindrical armature with a fixed ferrite core engaging said cup-shaped member, said ferrite core forming an annular magnetic field surrounding the said coil, a guide member for the cup-shaped support formed as a toroidal ring of lowfriction low-density material forming one piece with the cup-shaped member and defining a clearance of several microns with said cylindrical armature, a damping member interposed between the closed end of the cup-shaped member and the circular front'surface of the cylindrical armature and a spring for returning the cup-shaped member to its rest position.
Such a device combines a high electro-magnetic efficiency with the simplicity of a ratchet-wheel.
BRIEF DESCRIPTION OF THE DRAWING Other features and advantages will become apparent from the description two embodiments ofthe above device given merely-by way of example with reference to the accompanying drawing, in which:
FIG. 1 is a schematic showing of a first embodiment v ofthe step-by-step drive device for a ratchet-wheel ac- DESCRIPTION OF PREFERRED EMBODIMENTS A The device of FIG. 1 comprises a ratchet-wheel 1 driven by a pawl 2 which is by one end fixed to the closed end 3 of a cylindricalcup-shaped member 4.
The other end of the pawl 2 slides in a bearing 5 and cooperates with a fixed abutment 6.
' The cup-shaped member 4 carries an aluminum coil 7 connected to a source of electric pulses (not shown). The cup-shaped member 4 is fitted on to a cylindrical carbon steel armature 8 connected by a suitable bridging portion 9 to an annular ferrite core 10 to the coil 7.
Between the bridging portion 9 of the ferrite core 10 and the end of the cup-shaped member 4 a spiral spring 11 is arranged coaxially with the cup-shaped member.
Such a spring which is preferably of nickel silver is shown in more detail in FIG. 2.
' At the open end of the cup-shaped member and on the interior surface thereof is provided a toroidal ring guide member 12 formed of low-friction low-density material. Between the guide member 12, and the armature 8 is a clearance of several microns.
Finally, a Neoprene R pad fixed to the circular front face of the armature 8 protrudes towards the closed end 3 of the cup-shaped member and acts as a damping member for the cup-shaped member 4.
With each electric pulse received by the coil 7 which is placed in the magnetic field provided by the radially magnetized ferrite core 10, the cup-shaped member is attracted towards the armature 8 until the closed end 3 of the cup-shaped member comes into contact with the bumper pad 13. In addition to the damping effect due to the pad 13, there is a damping effect due to the air contained in the cup-shaped member 4 during the sliding of the latter. When the pulse stops, the spring 11 returns the cup-shaped member and the pawl 2 to the position shown in FIG. 1 where the end of the pawl 2 comes in contact with the abutment 6.
In the device of FIG. 3, the parts similar to those shown in FIG. 1 are provided with the same, but primed numerals. In this embodiment, the radial magnetic field surrounding the coil 7' is obtained by a ferrite core 15 forming one piece with the armature 8 a cup-shaped member 16 is associated with the ferritecore 15 and another cup-shaped member 4 is received inside the cup-shaped member 16. A weighted lever 17 is interposed between the pawl 2 and the closed end 3' of the cup-shaped member 4. The weighted lever 17 is adapted to pivot about a fixed pivot 18. One of the arms ofthe lever 17 carries a counterweight 19 and is connected to the pawl 2' the other arm is connected by a link 20 to the closed end 3 of the cup-shaped member. Finally, a spring 21 corresponding to the return spring 11 of the device of FIG. 1 is biased to return the weighted lever 17 to its centered position.
The device of FIG. 3 is shown in its rest position, i.e., in the absence of pulses applied to the coil.
The two devices described above are characterized by an axial clearance of the pawl (2 or 2) defined by the abutments and therefore by the impossibility of turning the ratchet wheel 1 or 1' one or more teeth as is possible with known step-by-step drive devices.
Finally, with a device according to the invention an optimum efficiency while establishing the characteristics of the spiral spring 21 or of the elastic diaphragm 11 so that the period of the electric pulses is in proportion to the period of vibration of the coil and its movable assembly.
The device according to the invention may be used in situation in which displacements proportional to the number of electric pulses is to be obtained. The invention is particularly applicable to clock and watch making, especially quartz-crystal watches and clocks.
The invention is of course not limited to the disclosed embodiments but on the contrary covers all alternatives within the scope of the appended claims.
What is claimed is:
1. A step-by-step drive device for a ratchet-wheel acting through a pawl, said drive device comprising a movable cylindrical cup-shaped member having a closed end mechanically connected to the pawl, a coil connected to a source of electric pulses wound on said movable cup-shaped member, a cylindrical armature of a fixed ferrite core received in said cup-shaped member,'said ferrite core forming an'annular magnetic field surrounding said coil, a combined guide member and sealing'ring for the cup-shaped member formed as a [toroidal] ring of low-friction[,] low-density material fixed to the cup-shaped member and defining a clearance of several microns between the cylindrical armature arid the [cup-shaped] combined guide member andsealing ring, said. combined guide member and sealing ring together with said cup-shaped member and said ferrite core defining a pneumatic dampening means for said cup-shaped member, a damping member interposed between the closed end of the cupshaped member[,] and the circular front surface of the cylindrical armature, and resilient means for returning the cup-shaped member to its rest position.
2. A device according to claim 1, wherein the ferrite core is annular and produces the magnetic field surrounding the cup-shaped member, said pawl being fixed directly to the closed end of the cup-shaped member, and further comprising a bearing associated with an abutment, said resilient means being formed as an elastic diaphragm [such as a spiral spring mounted] coaxially with and [out-side] outside the cup-shaped member between the cup-shaped member and the [armature] ferrite core.
3. A device according to claim 1, wherein the pawl is connected to the closed end of the cup-shaped member through a weighted lever, one arm of the weighted lever being connected to the pawl and the other arm of the weighted lever being connected to the closed end of the cup-shaped member, said weighted lever having a counter-balancing weight, the resilient means being arranged to return the weighted .lever to its centered position.
. 4. A device according to claim 3 wherein said weighted lever hasathird arm, and said resilient means beingconnected to said third arm.
5. A device according to claim 3 wherein the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.
6. A device according to claim 2 where the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.
7. A device according to claim 2 wherein said resilient means is a spiral spring.
8. A device according to claim 2 wherein said resilient means is a spiral spring, said spring including inner and outer annular rings, and spiral elements joining together said rings.
9. A device according to claim 1 wherein said resilient means isa spiral spring, said spring including inner and outer annular rings, and spiral elements joining together saidrings.
10. A device according to claim 1 wherein the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.

Claims (10)

1. A step-by-step drive device for a ratchet-wheel acting through a pawl, said drive device comprising a movable cylindrical cup-shaped member having a closed end mechanically connected to the pawl, a coil connected to a source of electric pulses wound on said movable cup-shaped member, a cylindrical armature of a fixed ferrite core received in said cup-shaped member, said ferrite core forming an annular magnetic field surrounding said coil, a combined guide member and sealing ring for the cup-shaped member formed as a ring of low-friction lowdensity material fixed to the cup-shaped member and defining a clearance of several microns between the cylindrical armature and the combined guide member and sealing ring, said combined guide member and sealing ring together with said cup-shaped member and said ferrite core defining a pneumatic dampening means for said cup-shaped member, a damping member interposed between the closed end of the cup-shaped member and the circular front surface of the cylindrical armature, and resilient means for returning the cup-shaped member to its rest position.
1. A step-by-step drive device for a ratchet-wheel acting through a pawl, said drive device comprising a movable cylindrical cup-shaped member having a closed end mechanically connected to the pawl, a coil connected to a source of electric pulses wound on said movable cup-shaped member, a cylindrical armature of a fixed ferrite core received in said cup-shaped member, said ferrite core forming an annular magnetic field surrounding said coil, a combined guide member and sealing ring for the cup-shaped member formed as a ring of low-friction low-density material fixed to the cup-shaped member and defining a clearance of several microns between the cylindrical armature and the combined guide member and sealing ring, said combined guide member and sealing ring together with said cup-shaped member and said ferrite core defining a pneumatic dampening means for said cup-shaped member, a damping member interposed between the closed end of the cup-shaped member and the circular front surface of the cylindrical armature, and resilient means for returning the cup-shaped member to its rest position.
2. A device according to claim 1, wherein the ferrite core is annular and produces the magnetic field surrounding the cup-shaped member, said pawl being fixed directly to the closed end of the cup-shaped member, and further comprising a bearing associated with an abutment, said resilient means being formed as an elastic diaphragm coaxially with and outside the cup-shaped member between the cup-shaped member and the ferrite core.
3. A device according to claim 1, wherein the pawl is connected to the closed end of the cup-shaped member through a weighted lever, one arm of the weighted lever being connected to the pawl and the other arm of the weighted lever being connected to the closed end of the cup-shaped member, said weighted lever having a counter-balancing weight, the resilient means being arranged to return the weighted lever to its centered position.
4. A device according to claim 3 wherein said weighted lever has a third arm, and said resilient means being connected to said third arm.
5. A device according to claim 3 wherein the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.
6. A device according to claim 2 wherein the operative effect of said resilient means on the movable components of said device provides the movable components with a vibration frequency generally corresponding with the frequency of the electric pulses.
7. A device according to claim 2 wherein said resilient means is a spiral spring.
8. A device according to claim 2 wherein said resilient means is a spiral spring, said spring including inner and outer annular rings, and spiral elements joining together said rings.
9. A device according to claim 1 wherein said resilient means is a spiral spring, said spring including inner and outer annular rings, and spiral elements joining together said rings.
US383064A 1972-12-20 1973-07-27 Step-by-step device for a ratchet-wheel Expired - Lifetime US3869930A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048602A (en) * 1975-06-30 1977-09-13 Diamantides Nick D Universal impedance power apparatus
DE2757800A1 (en) * 1976-12-30 1978-07-06 Salomon & Fils F SAFETY SKI BINDING
US4112450A (en) * 1976-02-18 1978-09-05 Fuji Photo Film Co., Ltd. Shutter device for a photographic camera
US4508442A (en) * 1981-09-08 1985-04-02 Canon Kabushiki Kaisha Electromagnetically driven shutter camera having automatic focusing device
US4698608A (en) * 1986-04-29 1987-10-06 Bei Electronics, Inc. Variable force linear actuator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1043843A (en) * 1974-09-19 1978-12-05 Richard A. Stuber Linear electromagnetic compressor
DE3432927A1 (en) * 1984-09-07 1986-03-20 Bruno 8039 Puchheim Gruber Device for setting objects in slow rotational motion
US5424592A (en) * 1993-07-01 1995-06-13 Aura Systems, Inc. Electromagnetic transducer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US768667A (en) * 1902-12-31 1904-08-30 Daniel M Rothenberger Electrical counting apparatus.
US3088059A (en) * 1963-04-30 Massa
US3543596A (en) * 1969-01-09 1970-12-01 Gulf & Western Industries Drive mechanism having improved locking means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088059A (en) * 1963-04-30 Massa
US768667A (en) * 1902-12-31 1904-08-30 Daniel M Rothenberger Electrical counting apparatus.
US3543596A (en) * 1969-01-09 1970-12-01 Gulf & Western Industries Drive mechanism having improved locking means

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048602A (en) * 1975-06-30 1977-09-13 Diamantides Nick D Universal impedance power apparatus
US4112450A (en) * 1976-02-18 1978-09-05 Fuji Photo Film Co., Ltd. Shutter device for a photographic camera
DE2757800A1 (en) * 1976-12-30 1978-07-06 Salomon & Fils F SAFETY SKI BINDING
US4159124A (en) * 1976-12-30 1979-06-26 S.A. Etablissements Francois Salomon & Fils Safety binding for a ski
US4508442A (en) * 1981-09-08 1985-04-02 Canon Kabushiki Kaisha Electromagnetically driven shutter camera having automatic focusing device
US4698608A (en) * 1986-04-29 1987-10-06 Bei Electronics, Inc. Variable force linear actuator

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FR2210855B3 (en) 1976-01-09
FR2210855A1 (en) 1974-07-12

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