U.S. patent number 3,849,981 [Application Number 05/411,501] was granted by the patent office on 1974-11-26 for watertight watch case.
This patent grant is currently assigned to Kabushiki Kaisha Suwa Seikosha. Invention is credited to Yoshinori Futami, Yasutaka Tarusawa.
United States Patent |
3,849,981 |
Tarusawa , et al. |
November 26, 1974 |
WATERTIGHT WATCH CASE
Abstract
In a watch, the joint between the watch crystal and the frame
for said crystal is rendered water-tight by placing a gasket
therebetween and providing means for pressing said crystal toward
said frame in an axial or diametral direction. A second gasket may
be used for joining said frame to the watch case water-tightly.
Inventors: |
Tarusawa; Yasutaka (Okaya,
JA), Futami; Yoshinori (Suwa, JA) |
Assignee: |
Kabushiki Kaisha Suwa Seikosha
(Tokyo, JA)
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Family
ID: |
14522849 |
Appl.
No.: |
05/411,501 |
Filed: |
October 31, 1973 |
Foreign Application Priority Data
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Nov 2, 1972 [JA] |
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47-109936 |
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Current U.S.
Class: |
368/291;
968/373 |
Current CPC
Class: |
G04B
39/02 (20130101) |
Current International
Class: |
G04B
39/02 (20060101); G04B 39/00 (20060101); G04b
037/08 () |
Field of
Search: |
;58/9R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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317,193 |
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Nov 1956 |
|
CH |
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254,856 |
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May 1948 |
|
CH |
|
218,928 |
|
Jan 1942 |
|
CH |
|
274,299 |
|
Mar 1951 |
|
CH |
|
219,707 |
|
Feb 1942 |
|
CH |
|
305,774 |
|
Mar 1955 |
|
CH |
|
215,448 |
|
Jun 1941 |
|
CH |
|
443,158 |
|
Jan 1968 |
|
CH |
|
640,293 |
|
Dec 1936 |
|
DT |
|
741,064 |
|
Sep 1943 |
|
DT |
|
Primary Examiner: Miller, Jr.; George H.
Attorney, Agent or Firm: Blum Moskovitz Friedman &
Kaplan
Claims
What is claimed is:
1. An improved water-tight crystal mounting for a watch of the type
having a frame for supporting a watch crystal, a gasket
respectively overlying and underlying said frame, an inner case
body releasably connected to said underlying gasket, a bezel
retaining said crystal against said overlying gasket and an outer
casing cooperatively connecting said frame and said inner case
body, said improvement comprising an auxiliary means for releasably
connecting said frame and said bezel for thereby reinforcing the
seal of said crystal against said overlying gasket, said reinforced
seal being undisturbed by successive releases of said outer casing
and said inner case body for access to an encased movement.
2. The improvement as claimed in claim 1, said frame including an
axially upstanding rim provided with a blind groove seat, a
shoulder radially outside of and below said rim on which a lip of
said outer casing is seated, a leg radially outside of and below
said rim terminating in an upstanding foot, said leg providing a
seat for said overlying gasket, said gasket having a recess for the
periphery of said crystal, said bezel overlying said frame,
overlying gasket, and the periphery of said crystal and including
an axially depending rim snap-fit into and seated in said frame
groove seat, said snap-fit bezel thereby compressing said crystal
against said gasket supported on said frame for a reinforced
water-tight seal, said outer casing being disconnectable from said
frame shoulder without concurrently disconnecting the sealed
members.
3. The improvement as claimed in claim 1, said frame including
substantially linear recessed and raised portions, said raised
portion thereof terminating at its interiorly extending end in an
upstanding flange, said recessed portion of said frame having a
through hole therein, said bezel being mounted on said recessed
portion of said frame and upstanding thereon, said bezel including
a widened base, and a narrowed upstanding body portion terminating
in a radially extending flange, a lip of said outer casing being
releasably connected to said widened base portion of said bezel,
said widened base portion of said bezel having a blind threaded
hole located in the underside surface thereof extending upwardly
through said base into said narrowed body portion, said blind
threaded hole being registered with said through hole, said
overlying gasket overlying said raised portion of said frame and
being secured against a side wall of said bezel by said upstanding
flange, said crystal overlying said gasket and being compressed
thereagainst by said radially extending flange of said bezel, and a
screw upstanding in said through hole and threaded into said blind
hole for compressing said crystal into said supported gasket for a
reinforced water-tight seal, said outer casing being disconnectable
from said frame base without concurrently disconnecting the sealed
members.
4. The improvement as claimed in claim 1, said frame including an
exterior side wall continuously engaging an interior side wall of
said bezel, said frame and said bezel being contiguous, said frame
including a substantially flat upper surface terminating in an
upstanding flange for securing said overlying gasket in a seat
formed between said frame and said bezel, said bezel upstanding
adjacent said frame and upwardly beyond said frame, said bezel
including a widened base portion and a narrowed neck terminating in
an inwardly radially extending rim simultaneously compressing said
overlying gasket and engaging a chamfered exterior edge of said
crystal for compressing said crystal into said overlying gasket, a
lip of said outer casing being releasably connected to said widened
base portion of said bezel, said bezel further including a radial
through hole through the base portion thereof and said frame
further including a blind hole therein registrable with said
through hole, and a pin tightly fit through said through hole and
said blind hole for radially compressing said overlying gasket into
said neck of said bezel and simultaneously axially downwardly
compressing said overlying gasket and said crystal into said gasket
for a reinforced water-tight seal, said outer casing being
disconnectable from said bezel base portion without concurrently
disconnecting the sealed members.
5. The improvement as claimed in claim 1, said frame including a
radially outwardly extending shoulder and a groove seat in the
upper surface thereof, said overlying gasket being overfitted into
said groove seat, said bezel upstanding on said shoulder of said
frame and including an outer stepped surface defining first and
second shoulders therein, said first shoulder of said bezel being
substantially aligned and contiguous with said shoulder of said
frame, said bezel terminating in a radial inwardly extending flange
engaged to a chamfered edge of said crystal and compressing said
crystal axially downwardly into said overlying gasket, a lip of
said outer casing being releasably connected to said second
shoulder of said bezel, and a continuous compression spring
abutting aligned ends of said shoulder provided in said frame and
said first shoulder provided in said bezel and compressing said
shoulders for reinforcing the compressive force of said radial
inwardly extending flange of said bezel against said chamfered edge
of said crystal for a reinforced water-tight seal, an edge of said
compression spring abutting the interior surface of said outer
casing, said abutting edge being bevelled so as to permit
disconnection of said outer casing from said bezel without
concurrently disconnecting the sealed members.
Description
BACKGROUND OF THE INVENTION
It has been conventional to join the watch crystal of a watch to
the frame for said crystal by means of a material such as cement.
Unfortunately, as the cement ages, its dimensions change and its
bond to the frame and the crystal may deteriorate to such an extent
that water either as liquid or as vapor may penetrate to the
interior of the watch. Furthermore, in the event that the watch
crystal is broken or otherwise defaced, it becomes necessary to
provide a new frame as well as a new crystal or else to go through
the labor of removing pieces of crystal still adhering to the frame
as well as all traces of cement. As is evident, it would be
desirable, especially from the standpoint of cost, to be able to
replace the crystal alone and to be able to re-establish a
water-tight joint in the replacement process. This point becomes
especially important when the crystal and frame are other than
circular in shape. At the present time, watches are manufactured in
oval shape, square shape, egg shape, etc. For such non-circular
shapes, the cost of the frame is greater than for a circular frame,
so that the saving in cost resulting from the elimination of the
need to replace the frame when a crystal is broken becomes
particularly important.
SUMMARY OF THE INVENTION
In a water-tight watch case the joint between the watch crystal and
the frame for said crystal is made water-tight by providing a
gasket therebetween and means for pressing said crystal toward said
frame. Further, the joint between said crystal frame and the watch
case body is made water-tight by providing another gasket between
said frame and said case body. Means are also provided for pressing
together said frame and said case body in an axial direction. Means
for pressing said crystal toward said frame may consist of a pin
passing through coincident openings in a bezel and said frame when
said bezel is pressed toward said frame, and a snap fit between a
bezel and a frame. Other means are screws drawing said bezel toward
said frame and a leaf spring pressing said frame toward said
bezel.
An object of the present invention is a watch case of improved
water-tightness wherein the watch crystal and a frame around said
watch crystal 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 and means are provided to press
said crystal toward said frame.
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 where said water-tightness 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.
Still other objects and advantages of the invention will in part be
obvious and will in part be apparent from the specification.
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.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the invention, reference is had to
the following description taken in connection with the accompanying
drawings, in which:
FIG. 1 is a partial sectional view of a watch in accordance with
the prior art;
FIG. 2 is a partial sectional view of a watch case in accordance
with the present invention wherein a bezel and a frame are held
together in a snap fit;
FIG. 3 is another embodiment of the present invention wherein a
bezel and a frame are held together by a projection fitting into a
groove;
FIG. 4 is another embodiment of the present invention wherein a
bezel and a frame are held together with a screw;
FIG. 5 is another embodiment of the present invention wherein a
bezel and a frame are held together by a pin; and
FIG. 6 is an embodiment of the present invention wherein a bezel
and a frame are held together by a leaf spring.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A sectional view of a watch in accordance with the prior art is
shown in FIG. 1 where watch crystal 3 is held to crystal frame 6 by
means of cement. Further, frame 6 is pressed against inner watch
case 2 by outer watch case 1. Between frame 6 and inner watch case
2 is positioned 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 1 is provided as a
result of leaf spring 5a having pin 5 on the end thereof which
protrudes into opening 1a. Leaf spring 5a is disposed in groove 1b;
pin 5 can enter opening 1a only when outer watch case 1 is pressed
downward sufficiently. Pin 5 then maintains pressure in an axial
direction between members 6 and 2. The principal difficulty with
this construction is the cement bond between crystal 3 and crystal
frame 6; this bond deteriorates with age and eventually becomes
permeable to water or to water vapor. Moreover, as aforenoted, if
crystal 3 is broken, it becomes necessary to replace frame 6 as
well as crystal 3. Alternatively, all fragments of crystal adhering
to frame 6 must be removed and all vestiges of cement must be
removed from the upper surfaces of frame 6 before a new crystal can
be cemented thereto. Obviously, 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. Here gasket 18 rests in a groove
in crystal frame 16. The lower surface of crystal 13 is pressed
against gasket 18 by means of bezel 17. Bezel 17 is engaged in a
snap fit with frame 16 and the relative dimensions of members 13,
16, 17 and 18 are such that when bezel 17 snaps into position on
frame 16 pressure is exerted in an axial direction on gasket 18,
thereby establishing water tight seals at the interfaces between
gasket 18 and crystal 13 and gasket 18 and frame 16. A water tight
seal is established between gasket 14 and inner case body on the
one hand and gasket 14 and frame 16 on the other hand by means of
outer case body 11 using the same arrangement of a leaf spring in a
groove in inner case body 12 and a pin 15 fitting into an opening
11a in outer case body 11.
Use of a flexible and resilient gasket between the watch crystal
and the crystal frame eliminates the necessity for replacing the
frame when the crystal is broken or, alternatively eliminates the
necessity for removing all traces of crystal and cement from the
frame 16 before bonding thereto another crystal.
Consequently, the replacement of crystal 13 only involves
disengagement of bezel 17 from frame 16, an operation in which only
a small amount of labor is involved. A further advantage is the
fact that gasket 18 is resilient so that crystal 13 can absorb a
shock which would shatter a crystal directly bonded to its
frame.
FIG. 3 shows an embodiment in which bezel 37 has a projection or
tongue 37a and frame 36 has a mating groove 36a. Projection 37a can
be held in 36a in a snap fit or by threading or by the use of
cement. However, it should be noted that if cement is used it need
not be waterproof since the seal between crystal 33 and frame 36 is
established by gasket 38. It should be noted that the pressure of
bezel 37 against gasket 38 results in sealing in a radial direction
as well as in an axial direction.
FIG. 4 is an embodiment in which frame 46 is held to bezel 47 by
means of screw 40. In holding frame 46 and bezel 47 together
pressure is applied by the shoulder of bezel 47 against the
diagonal surface of crystal 43 and thereby against gasket 48
establishing the needed water-tight seal.
In the embodiment of FIG. 5, applying downward pressure to bezel 57
aligns openings in bezel 57 and frame 56 so that pin 50 can be
inserted, thereby maintaining pressure on crystal 53 and on gasket
58. Again, downward pressure on gasket 58 results in both a radial
and axial pressure against crystal 53.
The embodiment of FIG. 6 is similar in construction to that of FIG.
4 except that the pressure holding bezel 67 and frame 66 together
is applied by leaf spring 60.
As is evident, the shape of the gaskets in all of the embodiments
of the present invention could be varied so that either an axial
seal alone results or a combination of an axial and a radial seal
results.
It is important to note that all of the embodiments shown in FIGS.
2 through 6 are applicable to crystals and crystal frames of any of
the aforenoted shapes, with one exception. The single exception is
that in which projection 37a is threaded into groove 36a.
It will thus be seen that the objects set forth above, among those
made apparent from the preceding description, are efficiently
attained and, since certain changes may be made in the above
article without departing from the spirit and scope of the
invention, it is intended that all matter contained in the above
description and shown in the accompanying drawings shall be
interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended
to cover all of the generic and specific features of the invention
herein described, and all statements of the scope of the invention,
which, as a matter of language, might be said to fall
therebetween.
* * * * *