EP0226365A2 - Watch case structure - Google Patents

Watch case structure Download PDF

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Publication number
EP0226365A2
EP0226365A2 EP86309270A EP86309270A EP0226365A2 EP 0226365 A2 EP0226365 A2 EP 0226365A2 EP 86309270 A EP86309270 A EP 86309270A EP 86309270 A EP86309270 A EP 86309270A EP 0226365 A2 EP0226365 A2 EP 0226365A2
Authority
EP
European Patent Office
Prior art keywords
packing
back cover
outer periphery
watch case
screw
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.)
Withdrawn
Application number
EP86309270A
Other languages
German (de)
French (fr)
Other versions
EP0226365A3 (en
Inventor
Masataka Matsumoto
Toshio Murata
Tadao Enomoto
Mitsuhiro Nakajima
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.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch Co 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 Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Publication of EP0226365A2 publication Critical patent/EP0226365A2/en
Publication of EP0226365A3 publication Critical patent/EP0226365A3/en
Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to a watch case structure.
  • a watch of a neat design appearance tends to gain favor, in which the edge of the middle revealed around the periphery of the glass is slender, but some watch case structures have difficulty in getting a slender edge.
  • FIG. 1 is a sectional view showing the main parts of a prior art watch case as a first example.
  • a shoulder 1a around the inner periphery of the lower part of a middle 1 and a shoulder 2a around the outer periphery of the lower part of a casing band 2 provided inside the middle 1 define a recess, in which a packing 3 is lodged.
  • a back cover 4 for closing the back side of the middle 1 is engagedly locked into the middle 1 by means of a screw 5 inserted in the outer periphery of the back cover 4.
  • the packing 3 compressedly sandwiched between the inner surface of the back cover 4 and the above-mentioned recess keeps a water-resistant function for the back cover portion.
  • a vertical shoulder face 1b is formed all around the inner periphery of the middle 1, and a wall thickness A is kept as a flange between the vertical shoulder face 1b and the screw 5.
  • the middle 1 is closed at its front side by a glass 8 fixed to the middle 1 through a packing 7.
  • FIG. 2 is a sectional view showing the main parts of a prior art watch case as a second example.
  • a shoulder 1a around the inner periphery of the lower part of a middle 1 and a shoulder 2a around the outer periphery of the lower part of a casing band 2 provided inside the middle 1 define a recess, in which a packing 3 is lodged.
  • a back cover 4 for closing the back side of the middle 1 is engagedly locked into a threaded pipe 6 embedded in the back side of the middle 1 by means of a screw 5 inserted in the outer periphery of the back cover 4.
  • the packing 3 compressedly sandwiched between the inner surface of the back cover 4 and the above-mentioned recess keeps a water-resistant function for the back cover portion.
  • a wall thickness A is kept as a flange between a vertical shoulder face 1b and the threaded pipe 6.
  • the object of the invention is to provide a watch case of a neat design in which although as in the prior art, the back cover 4 is locked in the middle 1 by engagement, the edge of the middle 1 is made as slender as possible.
  • a watch case structure where a packing is lodged in a recess defined by a shoulder provided around the inner periphery of the lower part of a middle and by a shoulder provided around the outer periphery of the lower part of a casing band provided inside the middle, and a back cover is locked in the middle by means of a back cover locking member, whereby said packing is compressedly held between the inner surface of the back cover and said recess, characterized in that said back cover locking member is in contact with the outer periphery of said packing to hold the same.
  • FIG. 3 is a sectional view of the main parts of a watch case showing a first embodiment of the invention
  • FIG. 7 is a partially cutaway plan view of the main parts of the watch case of FIG. 3 viewed from the back side thereof, in which a packing 11 is lodged in a recess defined by a shoulder 9a provided around the inner periphery of the lower part of a middle 9 and by a shoulder 10a provided around the outer periphery of the lower part of a casing band 10 provided inside the middle 9, and a back cover 12 for closing the back side of the middle 9 is engagedly locked in the middle 9 by means of a screw 13 inserted in the outer periphery of the back cover 12, whereby the water-resistant function for the back cover portion is kept by the packing 11 which is compressedly sandwiched between the inner surface of the back cover 12 and the recess.
  • a vertical shoulder face 9b receives the outer periphery of the packing 11, while where the screw 13 is fastened, there is no vertical shoulder face 9b for receiving the outer periphery of the packing, so that contact can be made between the screw 13 and the outer periphery of the packing 11. If there is no vertical shoulder face 9b of the middle 9 for receiving the outer periphery of the packing 11, there is a possibility of shift of the packing 11 in the clearance and causes uneasiness about the reliability in water-resistance.
  • the portion where the middle 9 does not receive the outer periphery of the packing 11 is only where the screw 13 is fastened, and at that portion, the outer periphery of the screw 13 receives the outer periphery of the packing 11. Therefore, there is no shift of the packing 11.
  • Our study of water-resistant functions by actual products manufactured by way of trial has shown that owing to the presence of the screw 13, there was almost no shift of the packing 11, thus maintaining an excellent water-resistant function.
  • the packing 11 is in contact with the screw 13. Therefore, when compared with the prior art of FIG. 1, the screw 13 is nearer in the direction of the center of the watch by the wall thickness A, and an edge width W2 is smaller than the edge width W1 of FIG. 1 by A.
  • FIG. 4 is a sectional view of the main parts of a watch case showing a second embodiment of this invention
  • FIG. 8 is a partially cutaway plan view of the watch case of FIG. 4 viewed from the back side thereof, in which a packing 11 is lodged in a recess defined by a shoulder 9a provided around the inner periphery of the lower part of a middle 9 and by a shoulder 10a provided around the outer periphery of the lower part of a casing band 10 provided inside the middle 9, and a back cover 12 for closing the back side of the middle 9 is engaged with a threaded pipe 14 embedded by soldering in the back side of the middle 9, by means of a screw 13 inserted in the outer periphery of the back cover 12 to lock the back cover 12 in the middle 9, whereby the water-resistant function for the back cover portion is kept by the packing 11 which is compressedly sandwiched between the inner surface of the back cover 12 and the recess.
  • a vertical shoulder face 9b receives the outer periphery of the packing 11, while where the threaded pipe 14 is embedded, there is no vertical shoulder face 9b for receiving the outer periphery of the packing, so that contact can be made between the threaded pipe 14 and the outer periphery of the packing 11. If there is not partially the vertical shoulder face 9b of the middle 9 for receiving the outer periphery of the packing 11, there is a possibility of shift of the packing 11 in the clearance and causes uneasiness about the reliability in water-resistance.
  • the portion where the middle 9 does not receive the outer periphery of the packing 11 is only where the threaded pipe 14 is embedded, and at that portion, the outer periphery of the threaded pipe 14 receives the outer periphery of the packing 11. Therefore, there is no shift of the packing 11.
  • Our study of water-resistant functions by actual products manufactured by way of trial has shown that owing to the presence of the threaded pipe 14, there was almost no shift of the packing 11, thus maintaining an excellent water-resistant function.
  • the packing 11 is in contact with the threaded pipe 14. Therefore, when compared with the prior art of FIG. 2, the threaded pipe 14 is nearer in the direction of the center of the watch by the wall thickness A, and an edge width W2 is smaller than the edge width W1 of FIG. 2 by A.
  • FIG. 5 is a sectional view of the main parts of a watch case showing a third embodiment of the present invention.
  • the structural differences from the second embodiment are:
  • the threaded pipe 14 is somewhat nearer in the direction of the center of the watch; an undercut 14a is formed around the outer periphery of the lower part of the threaded pipe 14 in the direction of the center of the watch so that the undercut 14a can be on the same flat with the shoulder 9a provided around the inner periphery of the lower part of the middle 9; and there is no vertical shoulder face (not shown) in the packing box portion provided around the inner periphery of the lower part of the middle 9.
  • the undercut 14a is provided so as to give a space for holding the packing 11.
  • FIG. 6 is a sectional view of the main parts of a watch case showing a fourth embodiment of the present invention.
  • the structural differences from the second embodiment are:
  • the threaded pipe 14 is nearer in the direction of the center of the watch by the thickness of the threaded pipe 14; an undercut 14b which eliminates the thickness of the lower portion of the threaded pipe 14 in the direction of the center of the watch is formed so that it can be on the same flat with the shoulder 9a provided around the inner periphery of the lower portion of the middle 9; and there is no vertical shoulder face (not shown) in the packing box portion formed around the inner periphery of the lower part of the middle 9.
  • the undercut 14b is provided so as to give a space for holding the packing 11.
  • the periphery of the packing 11 is in contact with the undercut 14b and the screw 13, and the edge of the middle becomes slenderer than the edge of the second embodiment by the thickness of the threaded pipe 14. And yet, it becomes even slenderer than that of the watch case of the third embodiment.
  • the packing is in contact with the screw and thus the screw is nearer in the direction of the center of the watch case than in the prior art, and where the threaded pipe is embedded, the packing is in contact with the threaded pipe and thus the threaded pipe is nearer in the direction of the center of the watch case than in the prior art. Therefore, the edge width of the middle can be smaller than that of the prior art, and there is an effect of producing design variations in neat appearance.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gasket Seals (AREA)
  • Details Of Measuring And Other Instruments (AREA)
  • Packaging Frangible Articles (AREA)
  • Electric Clocks (AREA)

Abstract

In a watch case structure where a packing (11) is lodged in a recess defined by a shoulder (9a) provided around the inner periphery of the lower part of a middle (9) and by a shoulder (10a) provided around the outer periphery of the lower part of a casing band (10) provided inside the middle (9), and a back cover (12) is locked in the middle (9) by means of a back cover locking member (13, 14), whereby the packing (11) is compressedly held between the inner surface of the back cover (12) and said recess, the back cover locking member (13, 14) is in contact with the outer pehiphery of the packing (11) to hold the packing (11), and thus the edge of the middle (9) can be made slender.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention
  • This invention relates to a watch case structure.
    • 2. Description of the Prior Art
  • In general, a watch of a neat design appearance tends to gain favor, in which the edge of the middle revealed around the periphery of the glass is slender, but some watch case structures have difficulty in getting a slender edge.
  • FIG. 1 is a sectional view showing the main parts of a prior art watch case as a first example. A shoulder 1a around the inner periphery of the lower part of a middle 1 and a shoulder 2a around the outer periphery of the lower part of a casing band 2 provided inside the middle 1 define a recess, in which a packing 3 is lodged. A back cover 4 for closing the back side of the middle 1 is engagedly locked into the middle 1 by means of a screw 5 inserted in the outer periphery of the back cover 4. The packing 3 compressedly sandwiched between the inner surface of the back cover 4 and the above-mentioned recess keeps a water-resistant function for the back cover portion. In this connection, in order not to adversely affect the water-resistant function, a vertical shoulder face 1b is formed all around the inner periphery of the middle 1, and a wall thickness A is kept as a flange between the vertical shoulder face 1b and the screw 5. On the other hand, the middle 1 is closed at its front side by a glass 8 fixed to the middle 1 through a packing 7.
  • FIG. 2 is a sectional view showing the main parts of a prior art watch case as a second example. A shoulder 1a around the inner periphery of the lower part of a middle 1 and a shoulder 2a around the outer periphery of the lower part of a casing band 2 provided inside the middle 1 define a recess, in which a packing 3 is lodged. A back cover 4 for closing the back side of the middle 1 is engagedly locked into a threaded pipe 6 embedded in the back side of the middle 1 by means of a screw 5 inserted in the outer periphery of the back cover 4. The packing 3 compressedly sandwiched between the inner surface of the back cover 4 and the above-mentioned recess keeps a water-resistant function for the back cover portion. A wall thickness A is kept as a flange between a vertical shoulder face 1b and the threaded pipe 6.
  • In the first prior art structure of FIG. 1, the tightened screw 5, the shoulder 1a and the flange A between the screw 5 and the vertical shoulder face 1b, etc. restrict a reduction in width of the edge of the middle 1, while in the second prior art structure of FIG. 2, the tightened screw 5, the embedded pipe 6 and the flange A between the pipe 6 and the vertical shoulder face 1b, etc. restrict a reduction in width of the edge of the middle 1. Thus, in both prior art structures, an edge width W1 cannot be made smaller to produce a neat design.
    • SUMMARY OF THE INVENTION
  • The object of the invention is to provide a watch case of a neat design in which although as in the prior art, the back cover 4 is locked in the middle 1 by engagement, the edge of the middle 1 is made as slender as possible.
  • According to the present invention, there is provided a watch case structure where a packing is lodged in a recess defined by a shoulder provided around the inner periphery of the lower part of a middle and by a shoulder provided around the outer periphery of the lower part of a casing band provided inside the middle, and a back cover is locked in the middle by means of a back cover locking member, whereby said packing is compressedly held between the inner surface of the back cover and said recess, characterized in that said back cover locking member is in contact with the outer periphery of said packing to hold the same.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIGS. 1 and 2 are sectional views each of the main parts of a watch case showing the first and second examples used conventionally;
    • FIGS. 3, 4, 5 and 6 are sectional views each of the main parts of a watch case of the present invention showing the first, second, third and fourth embodiments, respectively.
    • FIG. 7 is a partially cutaway plan view of the watch case of FIG. 3 viewed from the back side thereof; and
    • FIG. 8 is a partially cutaway plan view of the watch case of FIG. 4 viewed from the back side thereof.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Embodiments of the invention will now be described in detail with reference to the accompanying drawings.
  • FIG. 3 is a sectional view of the main parts of a watch case showing a first embodiment of the invention, and FIG. 7 is a partially cutaway plan view of the main parts of the watch case of FIG. 3 viewed from the back side thereof, in which a packing 11 is lodged in a recess defined by a shoulder 9a provided around the inner periphery of the lower part of a middle 9 and by a shoulder 10a provided around the outer periphery of the lower part of a casing band 10 provided inside the middle 9, and a back cover 12 for closing the back side of the middle 9 is engagedly locked in the middle 9 by means of a screw 13 inserted in the outer periphery of the back cover 12, whereby the water-resistant function for the back cover portion is kept by the packing 11 which is compressedly sandwiched between the inner surface of the back cover 12 and the recess. Except where the screw 13 is fastened, a vertical shoulder face 9b receives the outer periphery of the packing 11, while where the screw 13 is fastened, there is no vertical shoulder face 9b for receiving the outer periphery of the packing, so that contact can be made between the screw 13 and the outer periphery of the packing 11. If there is no vertical shoulder face 9b of the middle 9 for receiving the outer periphery of the packing 11, there is a possibility of shift of the packing 11 in the clearance and causes uneasiness about the reliability in water-resistance. In this embodiment, however, the portion where the middle 9 does not receive the outer periphery of the packing 11 is only where the screw 13 is fastened, and at that portion, the outer periphery of the screw 13 receives the outer periphery of the packing 11. Therefore, there is no shift of the packing 11. Our study of water-resistant functions by actual products manufactured by way of trial has shown that owing to the presence of the screw 13, there was almost no shift of the packing 11, thus maintaining an excellent water-resistant function.
  • In the above-mentioned structure, where the screw 13 is fastened, the packing 11 is in contact with the screw 13. Therefore, when compared with the prior art of FIG. 1, the screw 13 is nearer in the direction of the center of the watch by the wall thickness A, and an edge width W2 is smaller than the edge width W1 of FIG. 1 by A.
  • FIG. 4 is a sectional view of the main parts of a watch case showing a second embodiment of this invention, and FIG. 8 is a partially cutaway plan view of the watch case of FIG. 4 viewed from the back side thereof, in which a packing 11 is lodged in a recess defined by a shoulder 9a provided around the inner periphery of the lower part of a middle 9 and by a shoulder 10a provided around the outer periphery of the lower part of a casing band 10 provided inside the middle 9, and a back cover 12 for closing the back side of the middle 9 is engaged with a threaded pipe 14 embedded by soldering in the back side of the middle 9, by means of a screw 13 inserted in the outer periphery of the back cover 12 to lock the back cover 12 in the middle 9, whereby the water-resistant function for the back cover portion is kept by the packing 11 which is compressedly sandwiched between the inner surface of the back cover 12 and the recess. Except where the threaded pipe 14 is embedded, a vertical shoulder face 9b receives the outer periphery of the packing 11, while where the threaded pipe 14 is embedded, there is no vertical shoulder face 9b for receiving the outer periphery of the packing, so that contact can be made between the threaded pipe 14 and the outer periphery of the packing 11. If there is not partially the vertical shoulder face 9b of the middle 9 for receiving the outer periphery of the packing 11, there is a possibility of shift of the packing 11 in the clearance and causes uneasiness about the reliability in water-resistance. In this embodiment, however, the portion where the middle 9 does not receive the outer periphery of the packing 11 is only where the threaded pipe 14 is embedded, and at that portion, the outer periphery of the threaded pipe 14 receives the outer periphery of the packing 11. Therefore, there is no shift of the packing 11. Our study of water-resistant functions by actual products manufactured by way of trial has shown that owing to the presence of the threaded pipe 14, there was almost no shift of the packing 11, thus maintaining an excellent water-resistant function.
  • In the above-mentioned structure, where the threaded pipe 14 is embedded, the packing 11 is in contact with the threaded pipe 14. Therefore, when compared with the prior art of FIG. 2, the threaded pipe 14 is nearer in the direction of the center of the watch by the wall thickness A, and an edge width W2 is smaller than the edge width W1 of FIG. 2 by A.
  • FIG. 5 is a sectional view of the main parts of a watch case showing a third embodiment of the present invention. The structural differences from the second embodiment are: The threaded pipe 14 is somewhat nearer in the direction of the center of the watch; an undercut 14a is formed around the outer periphery of the lower part of the threaded pipe 14 in the direction of the center of the watch so that the undercut 14a can be on the same flat with the shoulder 9a provided around the inner periphery of the lower part of the middle 9; and there is no vertical shoulder face (not shown) in the packing box portion provided around the inner periphery of the lower part of the middle 9. Thus the outer periphery of the packing 11 is in contact with the undercut 14a in the threaded pipe 14. The undercut 14a is provided so as to give a space for holding the packing 11.
  • FIG. 6 is a sectional view of the main parts of a watch case showing a fourth embodiment of the present invention. The structural differences from the second embodiment are: The threaded pipe 14 is nearer in the direction of the center of the watch by the thickness of the threaded pipe 14; an undercut 14b which eliminates the thickness of the lower portion of the threaded pipe 14 in the direction of the center of the watch is formed so that it can be on the same flat with the shoulder 9a provided around the inner periphery of the lower portion of the middle 9; and there is no vertical shoulder face (not shown) in the packing box portion formed around the inner periphery of the lower part of the middle 9. Thus the outer periphery of the packing 11 is in contact with the screw 13 through the undercut 14b in the threaded pipe 14. The undercut 14b is provided so as to give a space for holding the packing 11.
  • According to the above-mentioned structure of the watch in the fourth embodiment, the periphery of the packing 11 is in contact with the undercut 14b and the screw 13, and the edge of the middle becomes slenderer than the edge of the second embodiment by the thickness of the threaded pipe 14. And yet, it becomes even slenderer than that of the watch case of the third embodiment.
  • As has been obvious from the above description, according to the structures of the present invention, where the screw is fastened, the packing is in contact with the screw and thus the screw is nearer in the direction of the center of the watch case than in the prior art, and where the threaded pipe is embedded, the packing is in contact with the threaded pipe and thus the threaded pipe is nearer in the direction of the center of the watch case than in the prior art. Therefore, the edge width of the middle can be smaller than that of the prior art, and there is an effect of producing design variations in neat appearance.

Claims (5)

1. In a watch case structure where a packing is lodged in a recess defined by a shoulder provided around the inner periphery of the lower part of a middle and by a shoulder provided around the outer periphery of the lower part of a casing band provided inside the middle, and a back cover is locked in the middle by means of a back cover locking member, whereby said packing is compressedly held between the inner surface of said back cover and said recess, characterized in that said back cover locking member is in contact with the outer periphery of said packing to hold the same.
2. In a watch case structure according to claim 1, characterized in that said back cover locking member comprises a screw engaged with a threaded hole provided in the back side of said middle, said screw being in contact with the outer periphery of said packing to hold the same.
3. In a watch case structure according to claim 1, characterized in that said back cover locking member comprises an internally threaded pipe embedded in the back side of said middle and a screw engaged with said pipe for locking said back cover into said middle, said pipe being in contact with the outer periphery of said packing to hold the same.
4. In a watch case structure according to claim 3, characterized in that an undercut is provided on the side opposite to the center of the watch around the outer periphery of the lower part of said pipe, said undercut being in contact with the outer periphery of said packing to hold the same.
5. In a watch case structure according to claim 3, characterized in that the thickness of the lower side of said pipe on the side opposite to the center of the watch is partially eliminated, and at said eliminated portion, said screw is in contact with the outer periphery of said packing to hold the same.
EP86309270A 1985-12-03 1986-11-27 Watch case structure Withdrawn EP0226365A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP186285/85 1985-12-03
JP18628585U JPS6293786U (en) 1985-12-03 1985-12-03

Publications (2)

Publication Number Publication Date
EP0226365A2 true EP0226365A2 (en) 1987-06-24
EP0226365A3 EP0226365A3 (en) 1989-03-29

Family

ID=16185628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86309270A Withdrawn EP0226365A3 (en) 1985-12-03 1986-11-27 Watch case structure

Country Status (2)

Country Link
EP (1) EP0226365A3 (en)
JP (1) JPS6293786U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7891567B2 (en) 2005-01-19 2011-02-22 Agency For Science, Technology And Research Identification tag, object adapted to be identified, and related methods, devices, and systems

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2093232A (en) * 1981-02-17 1982-08-25 Citizen Watch Co Ltd Back cover fixing structure for wristwatch
EP0127111A1 (en) * 1983-05-25 1984-12-05 Omega SA Water-tight watch case

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2093232A (en) * 1981-02-17 1982-08-25 Citizen Watch Co Ltd Back cover fixing structure for wristwatch
EP0127111A1 (en) * 1983-05-25 1984-12-05 Omega SA Water-tight watch case

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7891567B2 (en) 2005-01-19 2011-02-22 Agency For Science, Technology And Research Identification tag, object adapted to be identified, and related methods, devices, and systems

Also Published As

Publication number Publication date
JPS6293786U (en) 1987-06-15
EP0226365A3 (en) 1989-03-29

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