US3731480A - Watch pallet lever having integral projection determining swing - Google Patents

Watch pallet lever having integral projection determining swing Download PDF

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Publication number
US3731480A
US3731480A US00212495A US3731480DA US3731480A US 3731480 A US3731480 A US 3731480A US 00212495 A US00212495 A US 00212495A US 3731480D A US3731480D A US 3731480DA US 3731480 A US3731480 A US 3731480A
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US
United States
Prior art keywords
lever
pallet lever
pallet
watch
tab
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
US00212495A
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English (en)
Inventor
H Kurita
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.)
Suwa Seikosha KK
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Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
Application granted granted Critical
Publication of US3731480A publication Critical patent/US3731480A/en
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Expired - Lifetime legal-status Critical Current

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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
    • G04B15/00—Escapements
    • G04B15/12—Adjusting; Restricting the amplitude of the lever or the like
    • 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
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel

Definitions

  • ABSTRACT A watch pallet lever formed of sheet material has an [30] Forei n A lication Pri it D t integral tab bent up to form a projection engageable with opposite edges of a notch or opening in a bridge 1360.28, 1970 Japan", ..45/l32724 plate to define the Operational region of the pallet lever. [52] U.S. Cl. ....S8/116 R [51] Int. Cl. ..G04b 15/00 7 Claims, 2 Drawing Figures [58] Field of Search ..58/1l6 R, 28 R, 121 R, 58/122; 74/l.5
  • the present invention relates to lever escapements for watches and particularly to the pallet levers of such escapements.
  • the pallet lever in a lever escapement, is conventionally a three arm T-shaped lever pivotally mounted between support plates of the watch at the conjunction of the three arms.
  • Two shorter arms approximately in line with one another carry respectively entrance and exit pallet stones engageable with the teeth of an escape wheel to control the intermittent rotary movement of the escape wheel and thereby the movement of the watch.
  • a third, longer arm extends approximately perpendicular to the other two and is provided at its free end with a fork which is engageable by the ruby pin on the balance wheel to oscillate the pallet lever and thereby intermittently release the escape wheel for step-by-step movement.
  • a lever escapement it is necessary to define the amplitude and angular position of the operational region of the pallet lever. Otherwise the accuracy and reliability of the watch are adversely affected.
  • banking pins which project form one of the plates by which the pallet lever is pivotally supported and are engageable respectively with opposite edges of the longer arm of the pallet lever near the fork to limit its oscillatory movement.
  • banking pins In order to mount the banking pin, it is necessary to drill two holes in exactly the right locations in the plate to receive the pins. This is a precision operation which increases the cost of manufacture of the watch. If the holes are not accurately positioned, the watch does not run accurately.
  • the insertion and securing of the banking pins in the holes involves additional operations in the manufacture of the watch.
  • the operational region of the pallet lever is determined by a projection on the pallet lever that is integral with the lever itself and is engageable with the edge ofa notch or other opening provided in one of the plates pivotally supporting the pallet lever.
  • the projection is conveniently formed as a tab which is partially severed and bent up from the material of the lever. This can conveniently be done in the same operation as stamping the lever from strip or sheet stock.
  • FIG. 1 is a schematic plan view of a pallet lever and associated parts of a lever escapement of a watch in accordance with the present invention
  • FIG. 2 is a schematic section taken on the line 2-2 in FIG. 1.
  • the pallet lever 3 of the lever escapement of a watch is pivotally supported by a shaft 4 between two support plates 1 and 2 of a watch movement.
  • the support plates 1 and 2 are spaced from one another in conventional manner, for example by posts or pillars 6 to which the plates are secured by screws 6a.
  • the pallet lever is shown as a three arm T- shaped lever comprising two shorter arms 3c and 3d approximately in line with one another and a longer arm 3a approximately perpendicular to the other two arms, the pivot shaft 4 being located at the conjunction of the three arms.
  • the two shorter arms carry respectively an entrance pallet stone 5a and an exit pallet stone 5b engageable with the teeth of an escape wheel (not shown) to control the intermittent release of the escape wheel in usual manner.
  • a fork 3e which is engageable in usual manner by the ruby pin ofa balance wheel (not shown) to oscillate the pallet lever.
  • an integral projection 3b provided on the longer arm of the pallet lever 3 near the fork 3e is engageable with the opposite edges 2a and 2b ofa notch or recess 2c provided in one of the support plates 2 to determine the operational region of the pallet lever.
  • the pallet lever is formed of sheet stock and the projection 3b is formed as an integral tab which is defined by a U-shaped cut and bent up out of the plane of the lever at an angle so that the tip of the tab extends up into the plane of the support plate 2.
  • the projection 3b is located centrally of the width of the lever arm 3a and is hence symmetrical with respect to the section line 2-2 which defines the longitudinal axis of the arm 3a.
  • the tab comprising the projection 3b is conveniently formed in the same operation as the stamping of the pallet lever 3 from strip or sheet stock. Hence the projection 3a does not increase the weight or moment of inertia of the pallet lever and, moreover, does not increase the operations required for its manufacture and assembly.
  • the plate 2 may be a front or back plate or a bridge pivotally supporting one end of the shaft 4 of the pallet lever 3.
  • it can be made of thin stock having only such thickness and strength as are required for the pivotal support of the pallet lever and such other watch parts, for example the balance wheel and escape wheel, as are disposed between tlie plates 1 and 2.
  • the novel construction in accordance with the present invention assures precise definition of the operational region of the pallet lever and thereby contributes to the accuracy of the watch. Moreover, it eliminates the cost of making and assembling banking pins to limit the swing of the pallet lever, while at the sanie time providing more accurate control of the oscillation of the pallet lever. Thus the quality and precision of the timepiece are improved while reducing its cost of manufacture.
  • said pallet lever being of sheet material and said projection comprising a tab partially severed from and bent up out of the plane of said sheet material.
  • said tab being defined by a U-shaped cut in said sheet material, said tab being near the fork of said pallet.
  • said opening comprising a recess in an edge of said one support plate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
US00212495A 1970-12-28 1971-12-27 Watch pallet lever having integral projection determining swing Expired - Lifetime US3731480A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970132724U JPS513002Y1 (enrdf_load_stackoverflow) 1970-12-28 1970-12-28

Publications (1)

Publication Number Publication Date
US3731480A true US3731480A (en) 1973-05-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00212495A Expired - Lifetime US3731480A (en) 1970-12-28 1971-12-27 Watch pallet lever having integral projection determining swing

Country Status (3)

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US (1) US3731480A (enrdf_load_stackoverflow)
JP (1) JPS513002Y1 (enrdf_load_stackoverflow)
CH (2) CH586920B5 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203281A (en) * 1977-04-21 1980-05-20 Portescap Assembly comprising a timepiece pallet anchor and its frame
US6520108B1 (en) * 2000-03-30 2003-02-18 Denso Corporation Shaft arrangement of indicating instrument
US20140112110A1 (en) * 2011-08-29 2014-04-24 Eta Sa Manufacture Horlogère Suisse Platform escapement for a timepiece
US20150355599A1 (en) * 2013-03-19 2015-12-10 Nivarox-Far S.A. Pallet lever for a timepiece escapement mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH707813A2 (fr) * 2013-03-19 2014-09-30 Nivarox Sa Structure de mécanisme d'horlogerie pour mobile pivotant.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US257727A (en) * 1882-05-09 Clock-escapement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US257727A (en) * 1882-05-09 Clock-escapement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203281A (en) * 1977-04-21 1980-05-20 Portescap Assembly comprising a timepiece pallet anchor and its frame
US6520108B1 (en) * 2000-03-30 2003-02-18 Denso Corporation Shaft arrangement of indicating instrument
US20140112110A1 (en) * 2011-08-29 2014-04-24 Eta Sa Manufacture Horlogère Suisse Platform escapement for a timepiece
EP2735921A3 (fr) * 2011-08-29 2014-10-29 ETA SA Manufacture Horlogère Suisse Porte-échappement d'horlogerie
US8961002B2 (en) * 2011-08-29 2015-02-24 Eta Sa Manufacture Horlogère Suisse Platform escapement for a timepiece
US20150355599A1 (en) * 2013-03-19 2015-12-10 Nivarox-Far S.A. Pallet lever for a timepiece escapement mechanism
US9551976B2 (en) * 2013-03-19 2017-01-24 Nivarox-Far S.A. Pallet lever for a timepiece escapement mechanism

Also Published As

Publication number Publication date
CH586920B5 (enrdf_load_stackoverflow) 1977-04-15
CH1898071A4 (enrdf_load_stackoverflow) 1976-10-29
JPS513002Y1 (enrdf_load_stackoverflow) 1976-01-28

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