EP2491463A1 - Lever escapement mechanism - Google Patents

Lever escapement mechanism

Info

Publication number
EP2491463A1
EP2491463A1 EP10795603A EP10795603A EP2491463A1 EP 2491463 A1 EP2491463 A1 EP 2491463A1 EP 10795603 A EP10795603 A EP 10795603A EP 10795603 A EP10795603 A EP 10795603A EP 2491463 A1 EP2491463 A1 EP 2491463A1
Authority
EP
European Patent Office
Prior art keywords
lever
balance
balance wheel
pallet
spiral spring
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.)
Granted
Application number
EP10795603A
Other languages
German (de)
French (fr)
Other versions
EP2491463B1 (en
Inventor
Lyuboslav Krumov Blagoev
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2491463A1 publication Critical patent/EP2491463A1/en
Application granted granted Critical
Publication of EP2491463B1 publication Critical patent/EP2491463B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • G04B15/00—Escapements
    • G04B15/06—Free escapements
    • G04B15/08—Lever escapements
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction

Definitions

  • the invention relates to a lever escapement mechanism, which can find its application in fine mechanics and the clockworks of wrist and pocket watches and stationary clocks.
  • the mechanism consists of an escape wheel and an lever (anchor) connected with a balance wheel.
  • Its structure consists of a balance wheel with a spiral spring barrel connected to it performs fluctuating motions with strictly defined frequency. Radial towards the axis of the balance wheel there is a pallet attached which controls the lever by its operating fork, getting at the same time a force impulse by it, thus maintaining its fluctuating movement.
  • the lever itself controls the rotation of the escape wheel and it defines the speed of movement of the whole clockwork mechanism. The accuracy of the functioning of the clockwork is defined by the accuracy of the balance wheel rotation.
  • the mechanism proposed by me is similar to the one used by Mr. Mika Rissanen, but the similarity, however, starts and ends with the insertion of a second balance wheel, which rotates in synchrony with the first one but in opposite direction.
  • the task has been solved by creating a lever escapement mechanism, where to the existing balance wheel with the spiral spring barrel attached to it, an additional, second balance wheel, identical to the first one, has been mounted.
  • the second balance wheel has been equipped with a spiral spring barrel as well, whose parameters are equal to the parameters of the existing one but is a mirror image and is rotated to 180 degrees towards it.
  • Both of the spiral spring barrels are situated in one and the same plain.
  • the axis of the lever is parallel to the axes of the two balance wheels and is set on one straight line with them.
  • the lever controls the rotation of the escape wheel and the escape wheel determines the speed of the whole clockwork mechanism.
  • the angular difference "a" is defined by the looseness of the synchronizing pins.
  • the looseness can be altered according to the different constructional parameters chosen.
  • Both of the balance wheels work in one and the same plain and have equal technical parameters, as the second balance wheel rotates in synchrony with the first one but in the opposite direction (in anti-phase).
  • the two equal balance wheels carry out a contact between each other with the help of synchronizing pins but only when there is a strong enough torque moment, created by external disturbing forces. At the moment when the contact between the synchronizing pins is carried out, the arising forces are equal in size but opposite in direction and mutually neutralize each other.
  • FIG. 1 An example of a lever escapement mechanism is shown.
  • the proposed mechanism is, in fact, a classical lever escapement mechanism where, to the existing balance wheel (1 ), with a spiral spring barrel (2) connected to it, an additional, second balance wheel (7), identical to the existing one has been mounted. Radial towards the axis of the first balance (1) there is a pallet (3) attached which contacts with the lever (anchor) (5) by means of an operating fork (4).
  • the second balance wheel (7) has a spiral spring barrel (8), which is a mirror image and is rotated to 180 degrees towards the spiral spring barrel (2) of the first balance wheel (1). Both of the spiral springs (2), (8) are located on one and the same plain.
  • a pallet (9) is attached, which by means of the second operating fork (10) contacts with the lever (5).
  • Lever (5) is mounted on an axis, which is parallel to the axis of the two balance wheels (1 ), (7) and is set on one straight line with them, as on the one hand, the lever (5) ends with an operating fork (4) for the basic balance (1 ), and on the other hand, ends with a second operating fork (10) for the second balance (7).
  • the lever (5) and the two operating forks (2), (10) are located on one and the same plain. On the same lever (5) plain, the escape wheel (6) is situated.
  • Lever (5) has two clicks (pallets) by which it controls the functioning of the escape wheel (6) through which it gets force impulses which it transmits to both of the balance wheels.
  • the two balance wheels (1 ) and (7) operate on one and the same plain, and have equal technical parameters, as the second balance wheel (7) rotates in synchrony with the first one (1 ) but in the opposite direction (in anti-phase).
  • the two identical balance wheels (1 ) and (7) make contact between each other due to the synchronizing pins (11 ) only when there is a torque moment big enough, caused by the impact of the external disturbing forces.
  • lever escapement mechanism functions in the following way:
  • the lever (5) by its two forks (4), (10) contacts with the pallet (3), (9) respectively of the first (1 ) and the second (7) balance wheels, thus simultaneously transmitting to them equal in size and opposite in direction force impulses.
  • the two balance wheels (1 ), (7) rotate in synchrony, but in opposite directions.
  • the impact of external disturbing force will be simultaneous on both of the balance wheels (1 ), (7).
  • the torque moment of the force will be equal in size and direction for both of the balance wheels (1 ), (7). This torque moment will simultaneously accelerate the motion of one balance wheel and slow down the motion of the other one.
  • the spiral spring barrel (8) of the second balance wheel (7) is a mirror image and is rotated to 180 degrees towards the spiral spring barrel (2) of the first balance wheel (1 ) and is located on the same plain.
  • MexaHMMHM nacoBHULtn - ABTOPH A. ⁇ . ⁇ , E. JI.MMMOB, n3flaTen- CTBO TexHMKa 1959 r., Cocfrnfl.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Micromachines (AREA)
  • Automatic Assembly (AREA)

Abstract

The invention is about a lever escapement mechanism which finds its application in fine mechanics and the clockwork mechanisms of wrist and pocket watches and stationary clocks. Lever escapement mechanism consists of a basic balance wheel (1) with a spiral spring barrel (2) connected to it and towards the axis of the balance wheel (1) there is a pallet (3) radial attached, contacting with the lever (5) by means of an operating fork (4) and the lever (5) contacts with escape wheel (6). Above lever (5) there are restricting pins (12) and to the basic balance wheel (1) there is a second balance wheel (7) additionally mounted, being identical to the first one, as to the second balance wheel (7) there is a mirror image spiral spring barrel (8) fixed; the spring (8) is rotated to 180 degrees towards the spiral spring barrel (2) of the first balance wheel (1). Both of the spiral spring barrels (2), (8) are located in one and the same plain. Radial towards the axis of the second balance (7) there is a pallet (9) attached, due to which with the help of a second operating fork (10) it contacts with lever (5), whose axis is parallel to the axes of the two balance wheels and is set on one straight line with them; along the periphery of both of the balance wheels (1 ), (7) there are synchronizing pins (11) positioned. Between the basic pallet (3) and the additional pallet (9), there might be an angular shift, not bigger than angle "a", defined by the looseness between the synchronizing pins (11). Each of the two pallets (3), (9) is positioned at equal distance from the axis of lever (anchor) (5).

Description

LEVER ESCAPEMENT MECHANISM
Field of techniques
The invention relates to a lever escapement mechanism, which can find its application in fine mechanics and the clockworks of wrist and pocket watches and stationary clocks.
Prior art
Most of the contemporary mechanical watches use the so called lever escapement mechanism for accurate time measurement. This is evident from the reference section material of this report - 1 , 2, 3.
The mechanism consists of an escape wheel and an lever (anchor) connected with a balance wheel. Its structure consists of a balance wheel with a spiral spring barrel connected to it performs fluctuating motions with strictly defined frequency. Radial towards the axis of the balance wheel there is a pallet attached which controls the lever by its operating fork, getting at the same time a force impulse by it, thus maintaining its fluctuating movement. The lever itself controls the rotation of the escape wheel and it defines the speed of movement of the whole clockwork mechanism. The accuracy of the functioning of the clockwork is defined by the accuracy of the balance wheel rotation.
In the above described solution there are some essential disadvantages:
1. The accuracy of the balance wheel rotation in static position depends on the space orientation of the spiral spring barrel towards the gravitation force. This leads to faster or slower functioning of the clock.
2. The accuracy of the rotation of the balance wheel changes under the impact of external forces, when the mechanism is not in a static position. During its random motion in space, there emerge forces, some of which are directed in a way that they aim at either accelerating or slowing down the rotation of the balance wheel. This in its part makes the clock works faster or slower.
3. When these disturbing forces exceed a defined value, they can considerably alter the preliminary defined amplitude and frequency of the balance wheel and lead to a durable change in the accuracy of the clockwork operation. Up to now only one lever escapement mechanism with two balance wheels is known.
Its first public display took place in March 2009 at the annually held international exhibition in Basel, Switzerland. The wrist watch of Rudis Sylva - Oscillateur Harmonieux was equipped with it. The Finnish watchmaker Mika Rissanen, who works for the same company, is the inventor of the mechanism. In the structure of this watch a second balance wheel is put in, which is set in motion by the first one and rotates in the opposite direction (towards the first balance wheel). The transmission of the moment of rotation is accomplished by the periphery of the two balance wheels which are shaped as click wheels and their clicks are of a triangle shape.
At first sight, the mechanism proposed by me is similar to the one used by Mr. Mika Rissanen, but the similarity, however, starts and ends with the insertion of a second balance wheel, which rotates in synchrony with the first one but in opposite direction.
Actually, in my proposal there are some essential differences of principle and also some advantages in comparison with the mechanism invented by Mr. Rissanen.
They are as follows:
1. Both of the balance wheels rotate entirely freely;
2. Each one is set independently into motion by the lever;
3. Both of the spiral spring barrels wind and unwind simultaneously, thus ensuring completely synchronized rotation of the two balance wheels;
4. An interaction between the balance wheels occurs only if a strong enough external disturbing force exists;
5. The synchronizing pins only neutralize the impact of the external forces;
6. There aren't permanent disturbances of the balance wheels movement caused by the inevitable inaccuracy in the manufacturing and the joint functioning of two click wheels;
7. There aren't permanent disturbances in the movement of the two balance wheels caused by the transmission of a constantly changing in size and direction moment of rotation from the one balance wheel to the other. Respectively there aren't fulcrum reactions in the bearings of the two balance wheels caused by it. Technical essence of the Invention
The invention aims at creating a lever escapement mechanism which should eliminate the above mentioned disadvantages:
1. To minimize the impact of external, disturbing forces on the functioning of the balance wheel to preliminary defined limits.
2. To neutralize the impact of the gravitation force on the accuracy of the balance wheel functioning.
The task has been solved by creating a lever escapement mechanism, where to the existing balance wheel with the spiral spring barrel attached to it, an additional, second balance wheel, identical to the first one, has been mounted.
The second balance wheel has been equipped with a spiral spring barrel as well, whose parameters are equal to the parameters of the existing one but is a mirror image and is rotated to 180 degrees towards it.
Both of the spiral spring barrels are situated in one and the same plain.
Radial towards the axis of the second balance wheel there is also a pallet attached which contacts with the lever (anchor) by a second operating fork.
The axis of the lever is parallel to the axes of the two balance wheels and is set on one straight line with them.
On one side of the lever there is a fork for the pallet of the first balance wheel and on the other side there is a second operating fork for the pallet of the second balance wheel. The distance between the lever axes to each of the pallets is equal.
The lever with the help of two clicks (pallets) controls the rotation of the escape wheel and the escape wheel determines the speed of the whole clockwork mechanism. On the operating plain of the lever there are two restricting pins mounted, which limited its movement.
Along the periphery of the two balance wheels, are mounted synchronizing pins (11 ) which (the pins) confine the angular shifting of one of the balance wheel towards the other. In this way the angular difference "a" in the location of the two pallets (3), (9) towards the two forks (4), (10) is confined, thus ensuring their simultaneous presence in their operating area.
The angular difference "a" is defined by the looseness of the synchronizing pins. The looseness can be altered according to the different constructional parameters chosen.
Both of the balance wheels work in one and the same plain and have equal technical parameters, as the second balance wheel rotates in synchrony with the first one but in the opposite direction (in anti-phase). The two equal balance wheels carry out a contact between each other with the help of synchronizing pins but only when there is a strong enough torque moment, created by external disturbing forces. At the moment when the contact between the synchronizing pins is carried out, the arising forces are equal in size but opposite in direction and mutually neutralize each other.
The advantages of the so designed lever escapement mechanism with two balance wheels are:
1. The deviations from the normal functioning are preliminary limited and the mechanism is protected against durable changes of the amplitude and frequency of the balance wheel rotation.
2. The impact of the gravitation force on the accuracy of the mechanism functioning has been eliminated.
3. The preliminary defined parameters are automatically restored.
Descriptions of the enclosed figures
Figure 1 - An example of a lever escapement mechanism is shown.
Figure 2 - The angle "a" is shown in principle.
An example for the execution of the invention
In accordance with the description and the enclosed figures, the execution of the lever escapement mechanism as a model has the following structure:
The proposed mechanism. is, in fact, a classical lever escapement mechanism where, to the existing balance wheel (1 ), with a spiral spring barrel (2) connected to it, an additional, second balance wheel (7), identical to the existing one has been mounted. Radial towards the axis of the first balance (1) there is a pallet (3) attached which contacts with the lever (anchor) (5) by means of an operating fork (4).
The second balance wheel (7) has a spiral spring barrel (8), which is a mirror image and is rotated to 180 degrees towards the spiral spring barrel (2) of the first balance wheel (1). Both of the spiral springs (2), (8) are located on one and the same plain.
Radial towards the axis of the second balance wheel (7), a pallet (9) is attached, which by means of the second operating fork (10) contacts with the lever (5). Lever (5) is mounted on an axis, which is parallel to the axis of the two balance wheels (1 ), (7) and is set on one straight line with them, as on the one hand, the lever (5) ends with an operating fork (4) for the basic balance (1 ), and on the other hand, ends with a second operating fork (10) for the second balance (7).
The lever (5) and the two operating forks (2), (10) are located on one and the same plain. On the same lever (5) plain, the escape wheel (6) is situated. Lever (5) has two clicks (pallets) by which it controls the functioning of the escape wheel (6) through which it gets force impulses which it transmits to both of the balance wheels.
There are two pins (12) mounted on the same plain, whose function is to limit the motion of the lever.
Along the periphery of the two balance wheels (1 ) and (7), there are synchronizing pins (11 ) mounted, which restrict the angular shift between them and respectively between pallet (3) and pallet (9).
The two balance wheels (1 ) and (7) operate on one and the same plain, and have equal technical parameters, as the second balance wheel (7) rotates in synchrony with the first one (1 ) but in the opposite direction (in anti-phase).
The two identical balance wheels (1 ) and (7) make contact between each other due to the synchronizing pins (11 ) only when there is a torque moment big enough, caused by the impact of the external disturbing forces.
The shown on figure 2 preliminary defined looseness, equal to angle "a", defines the maximum of admissible angular deviation from the correct operation of the balance wheels (1 ), (7) and guarantees the simultaneous presence of the two pallets (3), (9) in the operating areas of the two forks (2), (10) of the lever (5).
How to apply the invention
In accordance with the invention the lever escapement mechanism functions in the following way:
The lever (5) by its two forks (4), (10) contacts with the pallet (3), (9) respectively of the first (1 ) and the second (7) balance wheels, thus simultaneously transmitting to them equal in size and opposite in direction force impulses. Thus the two balance wheels (1 ), (7) rotate in synchrony, but in opposite directions.
If there are no external disturbances they rotate entirely freely, without contacting each other.
This is guaranteed by the looseness left between the synchronizing pins (11 ), positioned along the periphery of the two balance wheels. This looseness is marked in figure 2 by angle "a".
The impact of external disturbing force will be simultaneous on both of the balance wheels (1 ), (7). The torque moment of the force will be equal in size and direction for both of the balance wheels (1 ), (7). This torque moment will simultaneously accelerate the motion of one balance wheel and slow down the motion of the other one.
The relative motion velocity between the two balance wheels (1 ), (7) will change; one of the wheels will rotate additionally towards the other and the synchronizing pins (11 ) will touch.
Thus the arisen disturbing moments will mutually neutralize.
Although between the two pallets (3), (9) there will be a certain angular shift, after their entering in the operating area and after their contact with the forks (4), (10) and after getting a force impulse by the lever (5) they will align their position.
Getting out of contact with the forks (4), (10), the pallets (3), (9) and respectively the two balance wheels (1 ), (7) will still have equal angular acceleration and velocity, i.e. they will rotate in synchrony but in opposite directions (in anti-phase).
To compensate the change in the duration of time intervals measured by the mechanism, which is caused by the different orientation of the plain in which it works towards the gravitation force the following, has been done:
The spiral spring barrel (8) of the second balance wheel (7) is a mirror image and is rotated to 180 degrees towards the spiral spring barrel (2) of the first balance wheel (1 ) and is located on the same plain.
With such orientation of the two spring barrels (2), (8) they will wind and unwind simultaneously, though the two balance wheels (1 ), (7) rotate in opposite directions.
The placement of the spring barrels (2), (8) at 180 degrees to each other on their operating plain defines the opposite impact to the gravitation force towards each of them.
In this way they will jointly eliminate the impact of gravitation force on the frequency of their own oscillations.
References:
1. "Taschenuhren"-Von der Halsuhr zum Tourbillon, Meis Reinhard 5te.
Auflage - Munchen: Callwey 1994. ISBN 3-7667-1133-4.
2. "MACAbl"-Me>KflyHapoflHbiii nacoBoii >KypHan 6p.3/2002r. MocKBa 000"l/l3flaTenbCTBO ripeMbepa"n.K.129085,np.OnbMMHCKoro 3A cfcaKC 0095 216 01 91 , E-mail: watch@astrel.ru . ISSN 1681-5181.
3. MexaHMMHM nacoBHULtn - ABTOPH: A. Χ.ΦΘΗΑΗΗ, E. JI.MMMOB, n3flaTen- CTBO TexHMKa 1959 r., Cocfrnfl.

Claims

1. A lever escapement mechanism, which consisting of balance wheel
(1 ) with a spiral spring barrel (2) connected to it, which is radial positioned towards the axis of the balance wheel (1 ) and has a pallet (3) attached to it contacting with lever (5) through operating fork (4); the lever (5) controls the escape wheel (6); on the plain of lever (5), there are restricting pins (12); which are characterized by the fact that to the existing balance wheel (1 ) an additional, second balance wheel (7) is mounted, which is identical to the first one; to the second balance wheel (7), a mirror image spiral spring barrel (8) has been fixed, which is rotated to 180 degrees towards the spiral spring barrel
(2) of the balance wheel (1 ); both of the spiral spring barrels (2), (8) are located on one and the same plain; radial towards the axis of the second balance wheel (7) there is a pallet (9) fixed, which by means of a second operating fork (10) contacts with the lever (5) whose axis is parallel to the axes of the two balance wheels and is set on one straight line with them; along the periphery of both of the balance wheels (1 ), (7) there are synchronizing pins ( 1 ) positioned.
2. Lever escapement mechanism, according to claim 1, is being characterized with the fact that between the basic pallet (3) and the additional pallet (9), there might be some angular shift not bigger than angle "a", which angle is preliminary defined by the looseness between the synchronizing pins (11 ). The two pallets (3), (9) are positioned at equal distance from the axis of lever (5).
EP10795603.9A 2009-10-19 2010-10-15 Lever escapement mechanism Not-in-force EP2491463B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BG10110496A BG110496A (en) 2009-10-19 2009-10-19 A starting clockwork
PCT/BG2010/000018 WO2011047449A1 (en) 2009-10-19 2010-10-15 Lever escapement mechanism

Publications (2)

Publication Number Publication Date
EP2491463A1 true EP2491463A1 (en) 2012-08-29
EP2491463B1 EP2491463B1 (en) 2014-07-09

Family

ID=43733261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10795603.9A Not-in-force EP2491463B1 (en) 2009-10-19 2010-10-15 Lever escapement mechanism

Country Status (3)

Country Link
EP (1) EP2491463B1 (en)
BG (1) BG110496A (en)
WO (1) WO2011047449A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019141789A1 (en) 2018-01-18 2019-07-25 Ecole polytechnique fédérale de Lausanne (EPFL) Horological oscillator
EP3719584A1 (en) 2019-04-02 2020-10-07 Ecole Polytechnique Fédérale de Lausanne (EPFL) Two degree of freedom oscillator system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103713511B (en) * 2012-09-28 2017-06-13 天津海鸥表业集团有限公司 A kind of micro-adjusting mechanism of resonant double balance wheel mechanical watch
CH711559B1 (en) * 2015-09-23 2020-01-31 Audemars Piguet Renaud Et Papi Sa Regulating device for timepiece, timepiece sub-assembly and timepiece movement.
FR3048790B1 (en) * 2016-03-14 2018-04-06 Lvmh Swiss Manufactures Sa MECHANISM FOR A WATCHING PART, A WATCHMAKING MOVEMENT AND A WATCHPIECE COMPRISING SUCH A MECHANISM.
JP7103041B2 (en) * 2018-08-03 2022-07-20 セイコーエプソン株式会社 Ankles, movements, watches

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Publication number Priority date Publication date Assignee Title
US22791A (en) * 1859-02-01 Escapement foe timekeepers
FR322419A (en) * 1902-05-30 1903-02-04 Meire Louis Exhaust-regulata system
WO2006067597A2 (en) * 2004-12-22 2006-06-29 Raoul Allaman Wristwatch regulating member

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011047449A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019141789A1 (en) 2018-01-18 2019-07-25 Ecole polytechnique fédérale de Lausanne (EPFL) Horological oscillator
EP3719584A1 (en) 2019-04-02 2020-10-07 Ecole Polytechnique Fédérale de Lausanne (EPFL) Two degree of freedom oscillator system

Also Published As

Publication number Publication date
BG110496A (en) 2011-04-29
WO2011047449A1 (en) 2011-04-28
EP2491463B1 (en) 2014-07-09

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