US3834154A - Device for fastening the inner end of a mainspring to the barrel arbor of a clockwork - Google Patents

Device for fastening the inner end of a mainspring to the barrel arbor of a clockwork Download PDF

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Publication number
US3834154A
US3834154A US00433479A US43347974A US3834154A US 3834154 A US3834154 A US 3834154A US 00433479 A US00433479 A US 00433479A US 43347974 A US43347974 A US 43347974A US 3834154 A US3834154 A US 3834154A
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US
United States
Prior art keywords
mainspring
arbor
end portion
spring
cut
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Expired - Lifetime
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US00433479A
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English (en)
Inventor
U Giger
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.)
Ebauchesfabrik ETA AG
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Ebauchesfabrik ETA AG
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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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/18—Constructions for connecting the ends of the mainsprings with the barrel or the arbor

Definitions

  • the mainspring is cut in the shape of an isosceles triangle at its end and has a triangular opening having two sides parallel to the edges of the blade of the mainspring and a base. The proportions selected permit the winding of the tip of the mainspring on the arbor.
  • the mainspring could also be cut with a tongue having oblique parallel edges.
  • the barrel arbors used up to the present time in clockworks and more particularly in watch movements contain in their central portion located in the center of the barrel an element of cylindrical surface from which there protrudes a hook intended to retain the inner end of the mainspring.
  • This hooking permits the cocking of the spring when the arbor is driven in rotation by the ratchet wheel and the holding fast of its inner end during the normal operation of the movement, while the ratchet wheel is held fast by the holding click.
  • the manufacture of the customary arbors therefore requires milling operations which increase the time of production and the cost of these parts.
  • These customary fastening devices also require a hole to be made at the end of the mainspring.
  • the object of the present invention is to simplify the manufacture of barrel'arbors by creating a device for fastening the inner end of the mainspring to the arbor which no longer requires any milling on the barrel arbor.
  • the invention is based on the finding that by cutting the end of the spring in such a manner that it rests against a surface of revolution of the arbor over a length equal to at least two turns, the friction between the arbor and the spring and the elastic clamping resulting from the fact that the inner turns are wound upon manufacture at a diameter which is less than that of the arbor were sufficient to assure a fastening which satisties the requirements established.
  • Its object is a device for fastening the inner end of a mainspring to the barrel arbor of a clockwork, characterized by the fact that the arbor has a surface of revolution which extends within the barrel, and by the fact that the inner end of the spring is cut in such a manner so as to be wound at least two'complete turns on the surface of revolution.
  • the fastening of the spring to the arbor is effected by frictional resistance.
  • FIGS. 1 and 2 are plan views of the inner end of the mainspring in each of its two embodiments.
  • FIGS. 3 and 4 are side elevations of a portion of the barrel arbor with the mainspring which is fastened to it in each of these embodiments, and
  • FIGS. 5 and 6 are sectional views along the lines VV and VI-VI of FIGS. 3 and 4, respectively.
  • the mainspring is fastened to the barrel arbor by friction. It has been found, as a matter of fact, that by imparting to the inner end of the mainspring a suitable shape which makes it possible to bring it into contact with the barrel arbor over a length equal to at least two turns, sufficient adherence to assure the connection is obtained.
  • the inner end of the mainspring is cut in the form of a very elongated isosceles triangle the height of which is equal to twice the circumference of the central portion of the arbor.
  • the apex of the isosceles triangle formed by the cut portion 1 of the spring 2 is truncated by a transverse edge 3 whose length is approximately equal to one-fifth the width of the spring 2.
  • the triangular tip 1 is provided with an opening 4 which forms a geometrical figure approximately similar to that of the triangular tip I and the height of which is equal to one-half and the base to three-fifths of the height and the base of the tip 1. Under these conditions, as can be noted from FIG.
  • FIG. 5 shows in cross section how the edges of the opening 4 are applied against the arbor.
  • the spring 8 has a cut end portion 9 which constitutes a tongue whose width is approximately equal to one-third of the width of the solid portion of the spring.
  • This tongue extends obliquely from one of the edges 13 of the spring 8 over a length which, measured along the longitudinal axis of the spring, is equal to twice the circumference of the cylindrical surface 10 of the arbor 11.
  • the inclination of the tongue 9 to the longitudinal axis of the spring 8 is such that the extreme corner 12 of its inner edge extends in the extension of the other edge 14 of the spring.
  • the tongue is wound helically in two adjacent turns around the surface 10, which also assures fastening by frictional resistance. In this case also the transverse edge 15 of the cutout could be beveled.
  • the tongue 9 could be narrower and longer than shown in FIG. 2 and be wound more than two turns around the arbor.
  • Means for fastening one end portion of a mainspring to a barrel arbor of a clockwork mechanism wherein said arbor has a surface of revolution which extends within the barrel, said one end portion of said mainspring having a cut shape such that said one end portion is wound around said barrel arbor on said surface of revolution and makes contact with said barrel arbor for at least two complete turns to fasten said spring to said arbor by frictional resistance.
  • the cut portion of the mainspring comprises a tip having the shape of an isosceles triangle of a height approximately equal to twice the circumference of said surface of revolution,.having an opening of the same shape as said isosceles triangle shape which extends from the base of said triangle to approximately the center of the height of said triangle, the dimensions of said opening being substantially the same as those of the end portion of the triangular tip portion located between the apex of said opening and the end of said mainspring.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
US00433479A 1973-02-09 1974-01-15 Device for fastening the inner end of a mainspring to the barrel arbor of a clockwork Expired - Lifetime US3834154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH190573A CH562463A (it) 1973-02-09 1973-02-09

Publications (1)

Publication Number Publication Date
US3834154A true US3834154A (en) 1974-09-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00433479A Expired - Lifetime US3834154A (en) 1973-02-09 1974-01-15 Device for fastening the inner end of a mainspring to the barrel arbor of a clockwork

Country Status (4)

Country Link
US (1) US3834154A (it)
CH (2) CH562463A (it)
FR (1) FR2217739B1 (it)
GB (1) GB1451257A (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014526691A (ja) * 2011-09-15 2014-10-06 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス コア直径が低減された時計の香箱アセンブリ

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2390732A1 (fr) * 2010-05-27 2011-11-30 Association Suisse pour la Recherche Horlogère Ressort de barillet
RU2682028C1 (ru) * 2017-11-20 2019-03-14 Публичное акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" Спиральный пружинный механизм

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE612146C (de) * 1935-10-29 E H Jakob Kienzle Dr Ing Zugfederbefestigung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE612146C (de) * 1935-10-29 E H Jakob Kienzle Dr Ing Zugfederbefestigung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014526691A (ja) * 2011-09-15 2014-10-06 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス コア直径が低減された時計の香箱アセンブリ

Also Published As

Publication number Publication date
CH190573A4 (it) 1974-12-31
FR2217739A1 (it) 1974-09-06
CH562463A (it) 1975-05-30
FR2217739B1 (it) 1976-11-19
GB1451257A (en) 1976-09-29
DE2362612B2 (de) 1977-02-24
DE2362612A1 (de) 1974-08-15

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