GB697864A - Improvements in or relating to hair springs - Google Patents

Improvements in or relating to hair springs

Info

Publication number
GB697864A
GB697864A GB686051A GB686051A GB697864A GB 697864 A GB697864 A GB 697864A GB 686051 A GB686051 A GB 686051A GB 686051 A GB686051 A GB 686051A GB 697864 A GB697864 A GB 697864A
Authority
GB
United Kingdom
Prior art keywords
spring
spiral
terminal portion
centre
march
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
Application number
GB686051A
Inventor
Wilfred Owen Davis
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.)
S Smith and Sons Ltd
S Smith and Sons England Ltd
Original Assignee
S Smith and Sons Ltd
S Smith and Sons England Ltd
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 S Smith and Sons Ltd, S Smith and Sons England Ltd filed Critical S Smith and Sons Ltd
Priority to GB686051A priority Critical patent/GB697864A/en
Publication of GB697864A publication Critical patent/GB697864A/en
Expired legal-status Critical Current

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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/066—Manufacture of the spiral spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/10—Spiral springs with turns lying substantially in plane surfaces

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Pyridine Compounds (AREA)

Abstract

697,864. Clocks and watches. SMITH & SONS (ENGLAND), Ltd., S. March 13, 1952 [March 22, 1951], No. 6860/51. Drawings to Specification. Class 139 [Also in Group XXXII] A hair spring is of material of uniform cross section, and is of spiral form except for an outer terminal portion, which is joined tangentially to the spiral portion, and is of material of at least twice the thickness of that of the spiral portion, and is so shaped and arranged in the plane of the spiral that there is no sinusoidal departure from proportionality between deflection and torque of the spring. The end of the terminal portion is encasted. The terminal portion is preferably in the form of a circular arc having its centre at the centre of the spiral portion, and is of uniform cross-section. The increased stiffness may be obtained by plating the end of a conventional spring, or by joining to such end an additional strip. Alternatively, it may be obtained in the process. of rolling a spring, by increasing the distance apart of the rollers. Formulae are derived in the specification relating to the radii of the terminal and spiral portions of the spring (in equilibrium position), the stiffnesses of these portions, and the angle subtended at the centre of the arc formed by the terminal portion. A spring of beryllium copper according to the invention is described in the Provisional Specification as applied to a tachometer.
GB686051A 1951-03-22 1951-03-22 Improvements in or relating to hair springs Expired GB697864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB686051A GB697864A (en) 1951-03-22 1951-03-22 Improvements in or relating to hair springs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB686051A GB697864A (en) 1951-03-22 1951-03-22 Improvements in or relating to hair springs

Publications (1)

Publication Number Publication Date
GB697864A true GB697864A (en) 1953-09-30

Family

ID=9822081

Family Applications (1)

Application Number Title Priority Date Filing Date
GB686051A Expired GB697864A (en) 1951-03-22 1951-03-22 Improvements in or relating to hair springs

Country Status (1)

Country Link
GB (1) GB697864A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1473604A1 (en) * 2003-04-29 2004-11-03 Patek Philippe S.A. Balance and flat hairspring regulator for a watch movement
EP2138912A1 (en) 2008-06-24 2009-12-30 Belot, Michel Horological hairspring with concentric development

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1473604A1 (en) * 2003-04-29 2004-11-03 Patek Philippe S.A. Balance and flat hairspring regulator for a watch movement
WO2004097534A1 (en) * 2003-04-29 2004-11-11 Patek Philippe S.A. Control member with a balance wheel and a planar spiral for a watch or clock movement
JP2006525504A (en) * 2003-04-29 2006-11-09 パテック フィリップ ソシエテ アノニム Adjustment device with balance wheel and flat spring for watch movement
US7344302B2 (en) 2003-04-29 2008-03-18 Patek, Philippe Sa Control member with a balance wheel and a planar spiral for a watch or clock movement
CN100465820C (en) * 2003-04-29 2009-03-04 帕特尔菲利普公司 The regulating device that comprises escapement and plane hairspring that is used for watch and clock movement
EP2224293A3 (en) * 2003-04-29 2011-03-02 Patek Philippe SA Genève Balance and flat hairspring regulator for a watch movement
JP4763595B2 (en) * 2003-04-29 2011-08-31 パテック フィリップ ソシエテ アノニム ジュネーブ Adjustment device with balance wheel and flat spring for watch movement
EP2138912A1 (en) 2008-06-24 2009-12-30 Belot, Michel Horological hairspring with concentric development

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