US3866409A - Crown assembly - Google Patents

Crown assembly Download PDF

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Publication number
US3866409A
US3866409A US428872A US42887273A US3866409A US 3866409 A US3866409 A US 3866409A US 428872 A US428872 A US 428872A US 42887273 A US42887273 A US 42887273A US 3866409 A US3866409 A US 3866409A
Authority
US
United States
Prior art keywords
crown
stem
bore
end portion
blind bore
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
US428872A
Other languages
English (en)
Inventor
Kumiko Tanaka
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Application granted granted Critical
Publication of US3866409A publication Critical patent/US3866409A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/04—Rigidly-mounted keys, knobs or crowns
    • G04B3/041—Construction of crowns for rotating movement; connection with the winding stem; winding stems

Definitions

  • a crown assembly for use on wrist watches having 11 crown provided with an axial blind bore.
  • a stem has an end portion received in the blind bore and is fixedly Coupled thereto y p g means having an [58] 58/90 B interference fit with the blind bore.
  • the arrangement le 0 can permits the crown assembly to be manufactured with [56] References Cited the crown and stem made independently and of differ ent materials.
  • the present invention relates generally to wrist watches and more particularly to a crown assembly.
  • the crown In conventional watches the crown generally has a stem or axis integral therewith. Thus if the crown is made of a soft material such as silver or some other material which cannot stand excessive stresses imposed on the stem when the crown is rotated or withdrawn it will cause failure of the stem.
  • the crown assembly according to the invention is used on wrist watches and comprises a crown and a stern made independently of each other.
  • the stem has an end portion coupled to the crown which has a blind bore for receiving the end portion of the stem coupling means are provided on the end portion of the stern coupling it to the inner surfaces of the blind bore thereby to couple the crown and stem in a fixed assembly.
  • the coupling may be accomplished by providing coupling means that have an interference fit in the blind bore. This is accomplished by having a bushing circumferentially of the end portion of the stem received in the blind bore.
  • the bushing is made of a resilient or deformable material that is deformed and presses against the stem end portion and the inner surfaces of the blind bore when forced into the blind bore with an interference fit.
  • the coupling means may be provided independently of the stem portion and the crown or the stem itself may have a bushing formed thereon integrally and made of a material that will provide an interference fit.
  • FIGS. 1 to 2c are prior art crown assemblies
  • FIGS. 3A-3C are section views of crown assemblies according to the invention.
  • FIG. 4A is a section view of another embodiment of a crown assembly according to the invention.
  • FIG. 4B is a plan view of a component of the crown assembly in FIG. 4A.
  • FIG. 5 is a cross section view of a crown assembly according to the invention in which coupling means are provided integral with the stem.
  • a conventional crown is illustrated in'FIG. 1.
  • the crown comprises a head portion a and a stem b.
  • the head portion and stem are made integral of any desired metal. for example a precious metal.
  • a crown assembly 1 is illustrated as having a blind bore 2.
  • a stem 3 has an end portion extending axially into the blind bore 2 and is provided with a flange or collar 3a in FIG. 2A spaced axially from the very end of the stem.
  • a bushing'4 made of a resilient or deformable material is disposed circumferentially of the end of the stem and has a diameter greater than that of the blind bore.
  • the bore opening flares outwardly for allowing insertion of the stem and bushing thereon so that an interference may be established between the bushing 4 and the blind bore.
  • the collar 3a is at the very end of the stem 3 and seats against a bottom 20 of the blind bore.
  • the coupling means constituting the bushing 4 in conjunction with the collar 3a in this second embodiment carries out the coupling function.
  • a collar on the stem may be avoided by constructing the stem with a minor diameter end portion 3b as illustrated in FIG. 2C and placing a coupling means constituting a deformable bushing 4 circumferentially of the reduced diameter 3b and having an interference and compressive fit as before described.
  • FIGS. 3A-3C another type of construction is employed with respect to the coupling means in which the bushing is provided with a lip circumferen tially thereof for engaging a recess circumferentially of the blind bore.
  • FIGS. 3A-3C This type of construction is illustrated in FIGS. 3A-3C.
  • a crown assembly 1 has a blind bore 2 having a peripheral recess 2b undercut into the crown, which recess accordingly extends into the crown outwardly from the bore, between the inner and outer ends of the bore.
  • a stem 3 is coupled to the crown by a bushing 4 having a periph eral lip a flaring outwardly from the body of the bushing and extending into the recess.
  • a collar 3a on the stem is provided at the end of the stem.
  • the coupling means constituting a bushing 4 is seated there against and the lip a extends outwardly and generally in an axial direction of the stem 3 away from the end of the stem as shown and in each instance is seated against a surface of the peripheral recess 2b tending to maintain the coupling means 4 seated against the collar 3a of the corresponding stem. This also tends to avoid axial separation of the stem from the crown.
  • a stem 3 is provided with a constriction 3c and a lip a of a coupling means 4 is a split lip in cross section having an inner lip part thereof extending into the constriction 30. Any tendency of axial separation of the crown and stem is avoided since the inner lip will seat against the beveled part of the constriction 3c and the outer lip will seat against a corresponding surface of the peripheral recess 2b so that the fixed assembly is maintained.
  • FIGS. 4A-4B A different construction is illustrated in FIGS. 4A-4B.
  • a crown assembly 1 has a crown assembled with a stem 3.
  • the stem is provided with an end collar as shown and the crown has a peripheral recess 2b.
  • a split ring 5 is inserted circumferentially of the stem and expanded into the peripheral recess and abuts against the end flange of the stem as illustrated.
  • the flexible coupling may be provided integral with the stem as illustrated in FIG. 5.
  • the stem 3 is made of a suitable plastic and an end collar 3a made integral therewith will constitute the coupling means.
  • the collar has a lip configured similarly as heretofore described and received in a peripheral recess 2b of the crown.
  • the end of the lip flares outwardly and abuts against a corresponding surface of the recess to maintain axial assembly of the crown and stem as before described.
  • the end portion of the stem has an interference fit in the blind bore of the crown as before described.
  • the crown of the various embodiments can be made out of silver nickel or any other desired metal.
  • the independent coupling means are made of a resilient or deformable material which is elastic and will tend to compress against the blind bore inner surfaces and against the stern surfaces for effecting a coupling thereof when inserted into the blind bore.
  • the stem can be made of an elastic or plastic material in the various embodiments illustrated. ln the embodiment in which the coupling means is integral therewith the stem and coupling means may be made of a suitable plastic.
  • a crown assembly for use in a watch comprising a metallic crown which has a blind bore and a peripheral, undercut recess of the bore; a stem having an end portion in the bore; and annular lip means extending outwardly from said end portion into the recess for coupling the crown to the stem.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adornments (AREA)
  • Electric Clocks (AREA)
  • Electromechanical Clocks (AREA)
US428872A 1972-12-29 1973-12-27 Crown assembly Expired - Lifetime US3866409A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48000477A JPS4990965A (de) 1972-12-29 1972-12-29

Publications (1)

Publication Number Publication Date
US3866409A true US3866409A (en) 1975-02-18

Family

ID=11474846

Family Applications (1)

Application Number Title Priority Date Filing Date
US428872A Expired - Lifetime US3866409A (en) 1972-12-29 1973-12-27 Crown assembly

Country Status (6)

Country Link
US (1) US3866409A (de)
JP (1) JPS4990965A (de)
CH (1) CH608158B (de)
DE (1) DE2365011A1 (de)
FR (1) FR2212572B1 (de)
GB (1) GB1433230A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974351A (en) * 1975-05-16 1976-08-10 Irving Solov Wrist watch push-button device
US6453512B1 (en) * 1999-10-19 2002-09-24 Eta SA Fabriques d′Ebauches Control button

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE514978T1 (de) * 2008-04-01 2011-07-15 Rado Montres Sa Steuervorrichtung mit drücker für uhr
CH720313A1 (fr) * 2022-12-09 2024-06-14 Officine Panerai Ag Coiffe de couronne de remontoir ou de poussoir.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062637A (en) * 1936-04-15 1936-12-01 Bulova Watch Co Inc Watch construction
US3595008A (en) * 1968-10-30 1971-07-27 Piquerez Sa Ervin A fluidtight connection for a timepiece winding knob
US3777474A (en) * 1971-10-08 1973-12-11 Piquerez Sa Ervin Fluid-tight control mechanism, for example for watches

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062637A (en) * 1936-04-15 1936-12-01 Bulova Watch Co Inc Watch construction
US3595008A (en) * 1968-10-30 1971-07-27 Piquerez Sa Ervin A fluidtight connection for a timepiece winding knob
US3777474A (en) * 1971-10-08 1973-12-11 Piquerez Sa Ervin Fluid-tight control mechanism, for example for watches

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974351A (en) * 1975-05-16 1976-08-10 Irving Solov Wrist watch push-button device
US6453512B1 (en) * 1999-10-19 2002-09-24 Eta SA Fabriques d′Ebauches Control button

Also Published As

Publication number Publication date
FR2212572A1 (de) 1974-07-26
CH608158B (fr)
FR2212572B1 (de) 1977-03-04
GB1433230A (en) 1976-04-22
JPS4990965A (de) 1974-08-30
CH608158GA3 (de) 1978-12-29
DE2365011A1 (de) 1974-07-11

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