US3691758A - Wristwatch comprising a monocoque case - Google Patents

Wristwatch comprising a monocoque case Download PDF

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Publication number
US3691758A
US3691758A US187615A US3691758DA US3691758A US 3691758 A US3691758 A US 3691758A US 187615 A US187615 A US 187615A US 3691758D A US3691758D A US 3691758DA US 3691758 A US3691758 A US 3691758A
Authority
US
United States
Prior art keywords
movement
dial
case
abutment means
timepiece
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
US187615A
Other languages
English (en)
Inventor
Jean-Claude Schneider
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.)
Tissot SA
Original Assignee
Fabrique dHorlogerie CHS Tissot et Fils SA
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 Fabrique dHorlogerie CHS Tissot et Fils SA filed Critical Fabrique dHorlogerie CHS Tissot et Fils SA
Application granted granted Critical
Publication of US3691758A publication Critical patent/US3691758A/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
    • G04B37/00—Cases
    • G04B37/04—Mounting the clockwork in the case; Shock absorbing mountings
    • G04B37/05—Fixed mountings for pocket or wrist watches
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/14—Fastening the dials to the clock or watch plates
    • 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
    • G04B37/00—Cases
    • G04B37/0008—Cases for pocket watches and wrist watches

Definitions

  • the object of the present invention is a wristwatch comprising a monocoque case provided with a groove for the glass, a glass whose shoulder is engaged in the glass groove, a movement and a dial held in place by the shoulder of the glass, and maintaining the movement securely in the watchcase.
  • Wristwatches of this type are already known in which the monocoque case is made of a plastic material which is sufficiently rigid to satisfy the conditions imposed upon objects of this type.
  • the dial In order to simplify and rationalize the manufacture of these watches, it has also been contemplated to make the dial in a single piece of injected or molded plastic and to use this dial to hold the movement in place within the monocoque case, the dial being itself fastened to the inside of the case by the shoulder of the glass.
  • these embodiments encountered a difficulty which resulted from the fact that it is difficult to effect the manufacture of a part such as a watch dial in plastic with sufficiently narrow tolerances with respect to the dimensions for the use contemplated.
  • the object of the present invention is to produce a wristwatch of the above-mentioned type, the parts of which can be encased rapidly while assuring a proper centering of the dial and the movement with respect in particular to the glass.
  • the wristwatch of the invention is characterized by the fact that the dial is centered with respect to the glass groove by guide members located on its periphery, on the one hand at the two ends of a diameter and on the other hand on a radius perpendicular to said diameter, the case having on its inner face guide elements which have a shape which is the reverse of that of the guide elements of the dial, but arranged in the same manner.
  • FIG. 1 is a partial axial section thereof.
  • FIG. 2 is a top plan view of the case on a scale
  • FIG. 3 is a bottom plan view of the dial.
  • the drawing shows a monocoque case 1 which comprises a main cup-shaped part of rigid plastic material, for instance a plastic reinforced with fiber glass, and a metal clamping ring 2 intended to secure the glass 3.
  • the latter has a shoulder 4 which engages, with the interposition of a thin sheet 5 of L-shaped profile, into the glass groove 6 which is formed by the inner face of a peripheral rib 7 located on the upper part of the case.
  • the case has a groove 8 of circular shape, the upper part of which is limited by a smaller cylindrical face and the lower part by a portion of slightly frustoconical surface.
  • the bottom 9 of this groove is flat.
  • the groove 8, 9 is interrupted at three places on the periphery of the case by ribs 10 which protrude into the lower part of the groove and are limited by the flat upper faces 11.
  • ribs 10 which protrude into the lower part of the groove and are limited by the flat upper faces 11.
  • two are diametrically opposite, while the third is located at the end of a radius perpendicular to the diameter which defines the first two. They are symmetrical with respect to said diameter and said radius and their side faces are parallel two by two.
  • one of the ribs is located in the axis of the winding stem.
  • the case described contains a movement 13 whose frame element opposite the dial has at its periphery a protruding collar 14 of circular shape.
  • This collar is engaged in an annular recess in the case 1 in such a manner that it is fastened in height and centered within the case.
  • the side face of the collar 14 is adapted in diameter to the inner side face 15 which limits said recess.
  • the dial 16 which is made of one piece of rigid plastic.
  • the hour circle, as well as the central hole 19 of the dial, are arranged in the same manner as in an ordinary movement.
  • the dial 16 On its back, the dial 16 has a cylindrical wall 17 which extends slightly recessed from the periphery. The latter therefore extends beyond the wall 17.
  • the dial 16 In its lower face it has three pairs of spurs 18 which are located, like the ribs 10, on opposite sides of a diameter and on opposite sides of a radius perpendicular to said diameter.
  • the distance between the spurs 18 with flat side face is, for instance, 2.6 mm and corresponds to the width of the ribs 10.
  • the two pairs of diametrically opposite spurs force the center of the dial to position itself on the diameter of the case which is defined by the ribs 10.
  • the third pair of spurs by engaging on the third rib 10, has the effect of bringing the center of the dial immediately into the axis of the case and therefore into the axis of the movement.
  • the wall 17 is split at the location of the winding stern so as to permit the passing of said member.
  • the dial could be cut from a metal plate or plate of other material with three notches on its periphery corresponding to the spurs of the case.
  • a timepiece comprising a monocoque case defining a movement-receiving compartment and an annular space in which is fitted a glass through which the watch dial is viewable, a movement fitted in said compartment, a watch dial fitted in said case axially between said glass and said movement, said dial bearing axially against said movement whereby said dial holds said movement against any axial movement thereof in said case, said case comprising three radially projecting abutment means which engages three corresponding radially projecting abutment means on said dial, two of said abutment means being diametrically opposed to each other relative to the central axis of said annular space and the third of said abutment means being located on a radius from said axis perpendicular to the diameter interconnecting said two abutment means.
  • each of said abutment means comprising a rib extending radially between two circumferentially spaced shoulders whereby said rib and shoulders are locked against any circumferential movement relative to each other.
  • said dial comprising an axially extending circumferential wall projecting axially adjacent to said abutment means and a radially pro ecting circumferential shoulder radially overlapping said abutment means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Electromechanical Clocks (AREA)
US187615A 1970-10-15 1971-10-08 Wristwatch comprising a monocoque case Expired - Lifetime US3691758A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1529670A CH530045A (fr) 1970-10-15 1970-10-15 Montre-bracelet comprenant un boîtier monocoque

Publications (1)

Publication Number Publication Date
US3691758A true US3691758A (en) 1972-09-19

Family

ID=4407952

Family Applications (1)

Application Number Title Priority Date Filing Date
US187615A Expired - Lifetime US3691758A (en) 1970-10-15 1971-10-08 Wristwatch comprising a monocoque case

Country Status (5)

Country Link
US (1) US3691758A (de)
CH (2) CH1529670A4 (de)
DE (1) DE2148171C3 (de)
FR (1) FR2110436B1 (de)
GB (1) GB1362582A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825722A (en) * 1995-10-27 1998-10-20 Smh Management Services Ag Timepiece comprising a case wherein a clockwork movement is housed
US20110127278A1 (en) * 2009-11-30 2011-06-02 Casio Computer Co., Ltd. Inner frame and case unit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH649889GA3 (fr) * 1983-02-23 1985-06-28 Umberto Maglioli Montre-bracelet de forme allongée
CH658967GA3 (de) * 1985-01-23 1986-12-31
CH670028GA3 (en) * 1986-11-19 1989-05-12 Casing for wrist-watch - includes inner frame and outer decorative casing fastened by screws
CH690871A5 (fr) * 1996-04-16 2001-02-15 Pierre Andre Joss Montre-bracelet.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825722A (en) * 1995-10-27 1998-10-20 Smh Management Services Ag Timepiece comprising a case wherein a clockwork movement is housed
US20110127278A1 (en) * 2009-11-30 2011-06-02 Casio Computer Co., Ltd. Inner frame and case unit
US8659979B2 (en) * 2009-11-30 2014-02-25 Casio Computer Co., Ltd Inner frame and case unit

Also Published As

Publication number Publication date
FR2110436B1 (de) 1976-03-26
CH530045A (fr) 1972-03-30
GB1362582A (en) 1974-08-07
CH1529670A4 (de) 1972-03-30
DE2148171A1 (de) 1972-04-20
DE2148171C3 (de) 1974-07-04
FR2110436A1 (de) 1972-06-02
DE2148171B2 (de) 1973-12-13

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