US3841085A - Watertight watch case - Google Patents

Watertight watch case Download PDF

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Publication number
US3841085A
US3841085A US00413292A US41329273A US3841085A US 3841085 A US3841085 A US 3841085A US 00413292 A US00413292 A US 00413292A US 41329273 A US41329273 A US 41329273A US 3841085 A US3841085 A US 3841085A
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US
United States
Prior art keywords
case body
crystal
water
frame
inner case
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
US00413292A
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English (en)
Inventor
T Akahane
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 US3841085A publication Critical patent/US3841085A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/02—Sealing crystals or glasses

Definitions

  • a first gasket is placed between the watch crystal and the frame for said crystal and a second gasket is placed between the frame and the inner case body of said watch case for rendering the watch case watertight.
  • Means are provided for urging the crystal axially toward the inner watch case body in an axial direction, thereby making the joints between the surfaces in contact with said gaskets watertight.
  • An object of the present invention is a watch case of improved water-tightness wherein the watch crystal and a frame are pressed together in a watertight joint and said frame and an inner case body are pressed together in a water-tight joint.
  • Another object of the present invention is a watch case of improved water-tightness wherein a gasket is provided between the watch crystal and the frame of said watch, a second gasket is provided between the frame of said watch and the inner case body of said watch and means are provided to press said crystal toward said inner case body.
  • a further object of the present invention is a watch case of improved water-tightness wherein the method of making the waterproof joint between the watch crystal and the frame is applicable to circular glasses, polygonal glasses, elliptical glasses, egg-shaped glasses and free-formed glasses in general.
  • Yet another object of the present invention is a watch case of improved water-tightness wherein said watertigh'tness does not deteriorate with age or with change in temperature.
  • An important object of the present invention is a watch case of improved water-tightness wherein the tendency of the watch crystal to break under shock is decreased.
  • a significant object of the present invention is a watch case of improved water-tightness wherein in the event of breakage of the watch crystal only the watch crystal need be replaced, thereby reducing the cost of replacement.
  • the invention accordingly comprises an article of manufacture possessing the features, properties, and the relation of elements which will be exemplified in the article hereinafter described, and the scope of the invention will be indicated in the claims.
  • FIG. 1 is a partial sectional view of a watch case according to the prior art which relies on a cement joint between the watch crystal and the crystal frame for water-tightness;
  • FIG. 2 is a partial sectional view of an embodiment in accordance with the present invention wherein an outer case body presses upon a bezel which in turn presses upon the crystal of said watch;
  • FIG. 3 is a partial sectional view of another embodiment of the present invention in which an outer case body presses directly upon a watch crystal;
  • FIG. 1 A sectional view of a watch in accordance with the prior art is shown in FIG. 1 where watch crystal 1 is held to watch crystal frame 2 by means of cement. Further, frame 2 is pressed against inner water case body 6 by outer case body 3. Between frame 2 and inner case body 6 is positioned gasket 4 of a resilient material such as rubber to provide a water-tight seal between these two elements of the structure.
  • gasket 4 of a resilient material such as rubber to provide a water-tight seal between these two elements of the structure.
  • Axial compression by outer watch case 3 is provided as the result of leaf spring 5a having pin 5 on the end thereof which protrudes into opening 3a.
  • Leaf spring 5a having pin 5 on the end thereof is disposed in groove 6a; pin 5 can enter opening 3a only when outer watch case 3 is pressed downward sufficiently.
  • Pin 5 then maintains pressure in an axial direction between members 2 and 6.
  • the principal difficulty with this construction is the cement bond between crystal 1 and crystal frame 2; this bond deteriorates with age and eventually becomes permeable to water or to water vapor.
  • crystal 1 is broken, it becomes necessary to replace frame 2as well as crystal 1.
  • all fragments of crystal adhering to frame 2 must be removed and all vestiges of cement must be removed from the upper surface of frame 2 before a new crystal can be cemented thereto.
  • either method of repair involves a substantial expense.
  • the cement bond of the conventional construction can be replaced with a gasket as shown in FIG. 2.
  • gasket 17 rests against the upper surface of frame 12 and the outer surface of shoulder 12a of frame 12.
  • the lower surface of crystal 11 is pressed against gasket 17 by means of pressure from outer case body 13 against bezel 18 which has a shoulder 18a pressing against an upper surface of crystal 11.
  • the axial pressure thus exerted againstcrystal 11 makes a water-tight joint between crystal 11 and frame 12.
  • outer case 13 The axial pressure provided by outer case 13 is transmitted through frame 12 against second gasket 14 which rests on an upper surface of inner case body 16.
  • the axial pressure transmitted through outer case body 13 similarly seals the joint between frame 12 and inner case body 16.
  • FIG. 3 An arrangement in which the bezel is eliminated is shown in FIG. 3 wherein outer case body 23, biased downwardly in an axial direction, presses against an upper surface of crystal 21 without an intermediary bezel.
  • frame 32 and gasket 37 make contact with each other in a radial direction as well as in an axial direction. Consequently, a seal is established against the outer periphery of crystal 31 and an inner periphery of frame 32.
  • a water-tight watch case comprises a crystal, a frame supporting said crystal, a first gasket between said crystal and said frame for a water-tight joint there between, an inner case body underlying said frame, a second gasket between said frame and said inner case body for a water-tight joint there between and means for biasing said crystal axially inwardly toward said inner case body with an effective force for thereby making said joints water-tight, said biasing means including an outer case body and a compression spring cooperating therewith, said compression spring acting radially on said outer case body for biasing said outer case body cooperatively toward said inner case body, said outer case body being arranged to bias said crystal simultaneously toward said inner case body.
  • said compression spring comprises a leaf spring and a pin affixed thereto, said inner case body including a groove in the periphery thereof for said leaf spring and said outer case body including a recess therein for said pin, said pin being received in said recess when said outer body is biased axially toward said inner case body, for thereby releasably connecting said outer case body to said inner case body for a plurality of water-tight joints there between.
  • said biasing means including a bezel operatively connected to said crystal for biasing said crystal axially inwardly into said inner case body, said outer case body cooperating with said bezel for biasing said bezel axially inwardly into operative connection with said crystal.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
US00413292A 1972-11-08 1973-11-06 Watertight watch case Expired - Lifetime US3841085A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972128619U JPS5239966Y2 (enrdf_load_stackoverflow) 1972-11-08 1972-11-08

Publications (1)

Publication Number Publication Date
US3841085A true US3841085A (en) 1974-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00413292A Expired - Lifetime US3841085A (en) 1972-11-08 1973-11-06 Watertight watch case

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US (1) US3841085A (enrdf_load_stackoverflow)
JP (1) JPS5239966Y2 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939647A (en) * 1973-08-24 1976-02-24 Kabushiki Kaisha Suwa Seikosha Structure of water-tight watch case
US4117658A (en) * 1975-09-05 1978-10-03 Kabushiki Kaisha Suwa Seikosha Waterproof watch case

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2845773A (en) * 1956-08-27 1958-08-05 Bulova Watch Co Inc Watch case
US3479771A (en) * 1966-10-14 1969-11-25 Jean Steimann Watchcase

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2845773A (en) * 1956-08-27 1958-08-05 Bulova Watch Co Inc Watch case
US3479771A (en) * 1966-10-14 1969-11-25 Jean Steimann Watchcase

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939647A (en) * 1973-08-24 1976-02-24 Kabushiki Kaisha Suwa Seikosha Structure of water-tight watch case
US4117658A (en) * 1975-09-05 1978-10-03 Kabushiki Kaisha Suwa Seikosha Waterproof watch case

Also Published As

Publication number Publication date
JPS5239966Y2 (enrdf_load_stackoverflow) 1977-09-09
JPS4984063U (enrdf_load_stackoverflow) 1974-07-20

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