US3676996A - Waterproof watch case - Google Patents

Waterproof watch case Download PDF

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Publication number
US3676996A
US3676996A US18991A US3676996DA US3676996A US 3676996 A US3676996 A US 3676996A US 18991 A US18991 A US 18991A US 3676996D A US3676996D A US 3676996DA US 3676996 A US3676996 A US 3676996A
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US
United States
Prior art keywords
case
ring
threads
watch
hardness
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
US18991A
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English (en)
Inventor
Yoshiaki Fujimori
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
Original Assignee
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 US3676996A publication Critical patent/US3676996A/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
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/11—Hermetic sealing of openings, joints, passages or slits of the back cover of 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
    • G04B37/00—Cases
    • G04B37/0008—Cases for pocket watches and wrist watches

Definitions

  • the metals of which the case-body and case-back are made may differ in hardness. Where these components are joined by mating screw-threads, and where the metals are of different hardnesses, then burrs or shavings may be produced during the assembly of these components. Such burrs or shavings may enter the watch movement, and degrade the performance of the watch.
  • FIG. 1 is a cross sectional view showing a conventional waterproof watch case
  • FIG. 2 is a cross sectional view showing a waterproof watch case according to the invention.
  • the present invention relates to an improved waterproof watch case wherein case body and case back are engaged by means of threads.
  • FIG. 1 shows a construction of a conventional waterproof watch case.
  • 1 is a case body of a waterproof watch case; threads 2 provided directly on the inner surface of said case body I; 3 a case back. Threads 4 provided on the outer surface of the case back 3 engages the threads 2 on the case body 1.
  • 5 is a gasket. Waterproofing is maintained in such a manner that gasket 5 is pressed by engaging the threads 2 on the case body 1 with the threads 4 on the case back 3 and tightening the case back 3. Since the threads 2 is provided directly on the case body I, the threads and the case body 1 are made of the same material.
  • the case body 1 differs from that of the case back 3
  • the case body is made of softer material than that of the case back or the case body is harder than the case back
  • the softer material is scraped off when tightening the threads 2 on the case body 1 with the threads 4 on the case back.
  • the burr drops inside the case and causes the watch to stop or deteriorates the quality of the watch.
  • case body is made of hard material, it is impossible to cut the threads 2 on the case body 1.
  • a complicated structure without threads is devised or a one-piece case in which case back 3 and casebody I in one body is employed, which results in low productivity and high cost.
  • the present invention seeks to eliminate such defect.
  • 6 is a case body of waterproof watch case, 7 a circular ring provided with threads 8, 9 a case back, threads 10 provided on the outer surface of the case back so as to engage with the threads 8 of the ring.
  • 11 is a gasket.
  • Ring 7 is fixed to the inner surface of the case body 6 by means of welding or adhesives, etc.
  • the ring is made of the material having the same hardness as the threads 10 of the case back regardless of the material of the case body 6. Waterproofing is maintained in such a manner that the threads 10 on the case back 9 engage the threads 8 on the ring 7 fixed to the case body 6 and the gasket 1 l is pressed by closing the case back 9.
  • the conventional case back 9 can be used and it is sufficient to fix the ring 7 to the inner surface of the case body 6 without requiring a complicated structure. As a result, productivity is greatly increased and the cost is reduced.
  • a water-proof watch case comprising a case-body having rearwardly facing spaced-apart first and second internal shoulders therein, an internally threaded ring affixed internally to said case-body in the space between said first and second shoulders, a case-back externally-threaded to mate with the threads of said ring, an external flange on said case-back rearward of the threads of said case-back, and a gasket of size and shape to engage said flange and said second shoulder thereby providing a watevtight seal between said case-body and said case-back, said case-back and said ring being of essentially equal hardness and differing in hardness from the hardness of said case-body.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Gasket Seals (AREA)
US18991A 1969-03-28 1970-03-12 Waterproof watch case Expired - Lifetime US3676996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2709269 1969-03-28

Publications (1)

Publication Number Publication Date
US3676996A true US3676996A (en) 1972-07-18

Family

ID=12211418

Family Applications (1)

Application Number Title Priority Date Filing Date
US18991A Expired - Lifetime US3676996A (en) 1969-03-28 1970-03-12 Waterproof watch case

Country Status (2)

Country Link
US (1) US3676996A (enrdf_load_stackoverflow)
GB (1) GB1256687A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775050A1 (fr) * 2005-10-14 2007-04-18 Eric Bouille Ensemble de boîtes de montre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2275881A1 (fr) * 2009-07-14 2011-01-19 ETA SA Manufacture Horlogère Suisse Dispositif de fixation d'au moins un élément métallique sur une carrure de pièce d'horlogerie

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553012A (en) * 1948-10-15 1951-05-15 Star Watch Case Company Waterproof watchcase
US3006139A (en) * 1959-03-27 1961-10-31 Ebauches Sa Electric watch
CH387549A (fr) * 1962-10-05 1964-10-15 Nardin Pierre Antoine Boîte étanche pour pièce d'horlogerie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2553012A (en) * 1948-10-15 1951-05-15 Star Watch Case Company Waterproof watchcase
US3006139A (en) * 1959-03-27 1961-10-31 Ebauches Sa Electric watch
CH387549A (fr) * 1962-10-05 1964-10-15 Nardin Pierre Antoine Boîte étanche pour pièce d'horlogerie

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775050A1 (fr) * 2005-10-14 2007-04-18 Eric Bouille Ensemble de boîtes de montre
WO2007042347A3 (fr) * 2005-10-14 2007-08-16 Eric Bouille Ensemble de boites de montre et son procede de fabrication
CN101287571B (zh) * 2005-10-14 2012-04-25 埃里克·布耶 表壳套件和用于生产它的方法

Also Published As

Publication number Publication date
GB1256687A (enrdf_load_stackoverflow) 1971-12-15

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