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Патент USA US2405928

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Aug- 13, . 1946.
W. FEURER
‘ 294%,928
ADJUSTABLE WATERTIGHT AND DUSTTIGHT WATCH CROWN
Filed Dec. 9, 1944
M25021 1 ~
Patented Aug. 13, 1946
2,405,928 »
UNITED STATES PATENT OFFICE
2,405,928
ADJUSTABLE WATERTIGHT AND
DUSTTIGHT WATCH CROWN
Walther Feurer, J ac {son Heights, N. Y., assignor,
by mesnc assignments, to Feurer Bros, Inc.,
New York, N. Y., a corporation of New York
Application December 9, 1944, Serial No. 567,493
2 Claims.
1
(01. 58-90)
2
,
The invention herein disclosed relates to watch
In the Fig. 1 form the inner guide is in the
crowns.
shape of an annular washer II loosely seated in
Special objects of the invention are to provide
the back of the crown and having a central pasa close ?tting, dust and water-tight crown con
sage I2 freely surrounding the tube.
struction which will not depend upon springs or 5
Similarly, in the ?rst form, the outer guide
the like for keeping it tight and which may be
also is a loose ?tting washer I2 disposed in the
readily adjusted at any time to take up any wear
hollow of the crown over the outer face of the
and restore it to the desired water-tight and dust
compressible packing and having a guide opening
tight condition.
I4 freely receiving the tube.
.
Other objects of the invention are to provide 10
Compression is applied to the packing in both
a crown construction of the character mentioned
forms of the invention by a ring or annular form
which will not interfere in any way with the
of nut I5 screwed into the hollow of the crown
mounting or unmounting of the crown and which
over the outer packing washer I3. This ring is
need not increase the overall size of the crown
shown as having notches or grooves it in the outer
15 face of the same for engagement by a suitable
structure.
Further objects are to provide a water-tight
spanner or other tool. This nut is shown as hav—
and dust-tight crown connection which will not
ing a central opening I‘! appreciably larger than
interfere in any way with either the winding or
the watch tube, enabling its use on watchcases
the setting of the watch and which ‘will main
having tubes of different diameter.
tain a proper seal during any or all such oper
ations.
Another object of the invention is to provide a
connection of the nature indicated which will per
mit use of the same size crown with watchcase
tubes of different diameters.
Other desirable objects and the novel features
by which the purposes of the invention are at
tained are set forth or will appear in the course
of the following speci?cation.
The drawing accompanying and forming part
20
The interior of the crown may be screw thread
ed the full depth, as indicated, or only for that
portion which might ever be reached by the nut
in adjusting tension on the packing.
In Fig. 2 the inner guide is constituted by the
25 inner or back wall I8 of the crown.
The use of
this back wall in place of a separate inner washer
necessitates the turning of an annular channel
I9 about the base of the post to receive the inner
end of the tube.
Such construction usually requires the use of
of the speci?cation illustrates two different em
an annular or circular cutter. This is a separate,
bodiments of the invention. Structure, however,
additional operation, requiring, particularly in
may be modi?ed and changed as regards these
illustrations, all within the true intent and broad
scope of the invention as hereinafter de?ned and
claimed.
Fig. 1 is a broken sectional view of one form
of the invention; and
Fig. 2 is a similar view of a slightly di?erent
form of the invention.
In both views the band or ring of a watchcase
is indicated at 5, having the usual projecting
?xed tube 6 for the stem ‘I.
In both illustrated embodiments the crown 8
is of hollow construction, having a screw thread-.
ed post 9 for detachable engagement with the
stem.
small crowns, a considerable degree of care and
skill.
For the reasons mentioned, the ?rst form illus
trated may be preferred where the cavity in the
back of the crown for receiving the extreme end
portion of the tube is provided by simply turning
or boring a conical depression 20 at the back wall
of the crown.
For other reasons the Fig. 2 form with the solid
or thicker back Wall and without the inner
washer forming an extra part, may be preferred.
In the second form, the edge 2| of the annu
lar out about the base of the post serves is a, guide
in the same manner as the opening I2 in the in
ner washer of the Fig. 1 construction.
The water-tight, dust-tight and substantially
The outer and inner guides provided by the
air-tight connection is effected in both forms of
outer washers I3 and the inner washer I I or back
the invention shown, by a gasket or washer Ii} 50 wall I8 facilitate the engagement of the crown
of suitable packing material such as rubber or
the like, compressibly held between annular
over and its removal from the tube and avoid in
jury from any extreme side pressure on the crown.
guides Within the crown in sealing engagement
These guides remain in effective position in both
between the rim of the crown and the exterior
the winding and the setting positions of the
smooth surface of the tube.
55 crown. This point is illustrated in Fig. 1 where
2,405,928
3
broken lines are interposed to indicate the shift
ed position of the inner guide in the setting posi
tion of the crown.
The parts are readily assembled. The degree
of compression required may be tested by turn
ing the nut tight into the crown and then slipping
the crown over the tube to sense the degree of
engagement of the packing with the tube. This
tension may be increased or diminished before
the crown is ?nally mounted. At any time the
connection may be quickly adjusted for wear by
simply unscrewing the crown from they stem and
tightening the nut more or less. Any tightening
or loosening of the nut does not twist-the pack
ing or otherwise disturb the parts, as" the not
has a smooth slide ?t over the face of > the outer
washer.
By provision of di?erent diameter washers and
packings the same crowns and nuts may be‘ used
for different diameter tubes, the larger internal
diameter of such nuts permitting of such use.
In all positions of use the crown is both sealed
All
annular side wall surrounding the tube and a
central, stem engaging post freely entered in
the tube, inner and outer guides positioned in
the crown to surround the tube in both the set
ting and the winding positions of the crown, an
annular packing compressiby held between said
inner and outer guides in position engaging the
annular side wall of the crown and the outer sur
face of the tube, the outer one of said guides be
ing free of both the tube and the crown, and an
annular nut adjustably engaged with said screw
threaded side wall of the crown, over said outer
guide, said nut surrounding but being free of
said tube.
2. A water-tight and dust-tight crown con
struction comprising in combination with a
watchcase having a ?xed projecting tube, a hol
10w crown having an internally screw threaded
annular side wall surrounding the tube and a
central, stem engaging post freely entered in the
tube,rinner and outer guides positioned in the
crown to surround the tube in both the setting
and the winding positions of the crown, an an~
and guided. The structure accomplishing these
nular packing compressibly held between said in
results is entirely concealed and protected; and
yet is quickly accessible if any adjustments are to Li ner and outer guides in position engaging the an
nular side wall of the crown and the. outer sur
required, Furthermore, the structure is- of a
universal design in that the same size, crown and
clamp nut may be applied to watchcases of dif
ferent styles and sizes.
What is claimed is:
1. A water-tight and dust-tight‘ crown con
struction comprising in combination with, a
' watchcase‘having ax?xed projecting‘tube, a hol
low crown having an‘ internally‘ screw‘ threaded‘
face of the tube, the outer one of said guides be
ing, free of ‘both the tube and the crown,_and an
annular nut .adjustably engaged with said screw
threaded side wall of the crown, over said outer
guide, said nut surrounding but being freeof said
tube, the inner guide being a washer supported
at the back of the hollow in the free crown.
WALTHER. FEURER.
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