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Патент USA US3099918

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Àug. 6, 1963
2 Sheets-Sheet 1
Filed March 17, 1961
Kurt Wolfìng er
Àug- 5, 1963
2 Sheets-Sheet 2
Filed March 1'7, 1961
Kurt Wolfìnger.
United States Patent Ó ” ice
FIG. 5 is a fragmentary perspective of the terminal
part of a link sleeve;
3,099 908
FIGS. 8 to 14 illustrate a second embodiment, namely:
K11“ Wßhìßser, Setmana, ¿Kries Calw, Germany, assigner
to Rodi & Wienenberger Aktiengesellschaft, Pforzheim,
FIG. 8 is a side combined elevation-section similar to
FIG'l but of another embodiment illustrated in the con
Filed Mar. 1,7, 1961, Ser. No. 96,516
Claims priority, application Germany Mar. 19, 1960
tracted state with the right side taken substantially along
the plane defined by line 8-8 4of FIG. 9;
v12 Claims. ' (Cl.`59f-'79) '
The present invention relates generally to 'bands and
more particularly to an expansible bracelet, especially
for wrist watches.
FIG. 6l is a perspective view of the connecting clip;
FIG. 7 is a perspective view of the leaf spring;
Patented Aug. (i, 1963
` FIGÄ9Vis a horizontal section view taken substantially
along the plane .desired by aine 95f-9 of FIG. s;
FIG.v l0 is a combined elevation-section illustrating
the band in the expanded state;
' FIG. 1l is a sectional view taken substantially along
the plane defined by line 11-11 of FIG. 10;
The band is constructed of hollow links and intermedi
ate or connecting links flexibly and expansibly connecting 15
’ `FIG. l2 isa perspective view of the connecting slip
of the second embodiment;
pivotally mounted against spring action. The hollow
the hollow> links together. These intermediate links are
' FIG. 13 is a plan‘of one >for-m of the leaf spring for
links are sleeves disposed in two layers and staggered with
respect to one another in the longitudinal direction of
the second embodiment, and
the bracelet. The staggered upper and lower sleeves may 20 ` FIG. 14 is a plan of another form of the leaf spring
for the second embodiment.
The íirst embodiment (FIGS. l to 7) of the expansible
bracelet has two separate superposed »layers or rows 1,
openings of the links. They each have one leg inserted
2 of links 3, 4 in the form> of sleeves having a rectangu
in the open end >of a sleeve of one layer andthe other
leg inserted in an adjacent staggered sleeve of the other 25 lar cross section. The links are staggered with respect
to one another in the longitudinal direction of the band.
layer. A leaf spring is disposed in each sleeve of at least
From the longitudinal walls' 5 of the lower- layer 2 of
one layer and opposes pivoting of the connecting clips
the links 4, short terminal flanges 6 are bent to -face in
and detains the latter in the sleeve.
wardly'toward each other at right angles to be disposed
The band or bracelet according to the present inven
tion differs from lconventional bands due to a novel con 30 in openings 7 (FIG. 5). lThe connecting links are
be of either single or `double link type. 'I‘he connecting
links comprise U-'shapedïclips disposed in the longitudinal
U-shaped clips 8’ (-FIG. 6) of spring material having a
struction of the U-shaped connecting clips and their as#
sembly with new leaf springs, and connection with the
rectangular cross section.
According to the invention, lat :least one of the legs
of the U-svhaped clips'is disposed in an open end of the
sleeves, and is split longitudinally to form two arms. One
arm is disposed under and the other over the leaf springs
which are disposed within the sleeves. The arms have
an initial stress when engaging the leaf springs. rThe
other leg of the U-shaped clip may engage and »accom 40
mod_ate a terminal ñange of the longitudinal wall of the
sleeves by a recess provided near the bight portion of the
clip. Alternatively this leg may engage a recess in the
leaf spring by Emeans of an inflection acting as a stop.
I_n one embodiment of the bracelet there are separate
Each clip is formed'from Ia
single ‘strip of material and includes a 'bight portion 9,
a leg 10 bent at right angles with the bight portion, and
another leg including’two" arms .11’ and 11”, each about
-half as wide as leg 10 Iand bent at right angles from
the other end of the bight portion 9. To for-m- the arms,
the portion of the strip used to form them and an ad
jacent part of the bight portion are split by a longitudinal
slit 12.' The yarms 11’ and 11” are bent olf at bight por
tion 9, at different distances yfrom leg 10. The differ
ence between these distances corresponds to the thick
ness of the ymetal sheet of leaf spring 15. In addition.
the two arms 11’ -and 11” are prestressed, bent some
45 what towards one another, and provi-ded at their ends
with bevels 13 extending from the outside to the inside.
upper and lower links and the leaf springs, acting to
On the same side of the clip 8' where higher arm 11’ is
gether with the split ar-ms of the U-shaped clips, have a
disposed land underlying sa-me, leg 1li has a rectangular
cross section forming an obtuse angle. In another em
recess 14 adjacent bight portion 9. The third part of this
bodiment of the bracelet the upper and lower links are
united to form a double link, and the leaf springs are 50 embodiment of the bracelet is the leaf spring 15 bent so
that its legs Vform yan obtuse 'angle in cross section
plane yand lie along a diagonal common to the united
(FIG. 7).
Additional objects and advantages of the present in
vention -will become apparent upon consideration of the
following description when taken in conjunction with
the accompanying drawings in which:
FIGS. l to 7 illustrate one embodiment, namely
springs 15 are inserted into the links 3 of the upper layer
1. The connecting clips 8’ are inserted with leg 1€) and
the two anns '11', 11" through the openings 7 of the links
FIfG. l is a side view of one embodiment of the band
illustrated in the' contracted state on the left side in
elevation and on the right in `section taken substantially
along the plane defined by line 1_1 of FIG. 2;
Y FIG. v2y is a horizontal sectional` view taken substantially
Before bending the flanges 6 into opening 7, the leaf
3 and 4 of the two layers 1 -and 2 in such a way that the
lower arm 11" engages the leaf spring 15 on its lower
surface, while the other yarm 11’ engages its upper surface.
60 'îhe insertion of the leaf spring 15 between the arms 11',
11” .against ‘their spring action is facilitated by the ter
minal bevels 13. This causes an initial stress of the arms
1v1', 11”, brought about by their `mutual bending, and the
cooperation of the leaf spring 15. Thus, the clip 8’ is
FIG. 3 is a side combined section-elevation similar
to FIG. 1, but illustrating the bracelet in the expanded 65 biased in -t‘he direction toward Áthat side of the clip which
has the higher arm 11’. The clip 8’ is pivoted While in
engagement with the flange 6 of the longitudinal wall of
FIG. 4 is a sectional view taken substantially along
the lower links 4 by the recess 14. in its leg lil and is de
a portion of the plane defined by line 4-’4 of FIG.> 3,
tained'in the links Sand 4,. The links 3 of the upper layer
but illustrating only the structure disposed in this plane,
except `for the edge wall of the links antiV arm 11" which 70 1 'and the links 4 ofthe lower layer 2 are pivotally con
nected to the connecting clips 8’V and thus may move to
is‘fshown to indicate its relationship
ram 11" and
ward 'one another in the longitudinal ¿direction of the
along the plane deiinel by line 2~-2 of FIG. 1;
spring 15;
band, ‘thereby contracting the bracelet, and can be ex
panded against the action of the arms 11', 11" and leaf
spring 15 biasing the links toward each other.
The second embodiment (FIGS. 8 to 14) of the brace
let is -constructed `of `double links |16 consisting of two
sleeves 16', 16" of substantially square cross section and
oífset with respect to one another. The sleeves 16’ form
the upper layer '17 and sleeves 16” for-m rthe lower layer
18 of the bracelet, the sleeves of which are offset from.I
those of layer 17. The double 1in-ks l16 are formed by
bending a rectangular metal sheet. A central bending
point 19 of the ,sheet lies at the connecting point of the
double links, while fthe terminal edges 20, 21 of the sheet
ing one leg vdisposed in a sleeve of one layer in one body
link Vand the other leg disposed in an adjacent sleeve of
the other layer in an adjacent body link, each of said
leaf springs having generally oppositely yfacing surfaces,
a portion of one -of said surfaces ‘bearing against its as
sociated body link, said clips each having one leg split
longitudinally to yform arms »disposed one against each of
said rsurfaces of i-ts associated leaf spring, the one of said
arms the closest to said surface portion bearing against the
other said surface of its associated leaf spring, said arms
having an initial stress directed against the leaf spring,
`whereby the links are biased toward each other.
2. The expansion ban-d of claim 1, wherein said arms
Ifreely oppose the bending point 19. The flanges 22, 23
are connected to the bight portion of the clip at posi
of the double links 16 which are the ends of fthe rec 15 tions spaced apart a distance corresponding to .the thick
tangular metal sheet, lie adjacent bending point 19 and
ness of the leaf spring, the -arrns being bent -toward each
may be diposed obliquely to the longitudinal direction
of the band. The connecting links of the second embodi
ment are also U-shaped clips 3” (FIG. 12) with a bight
portion »9, -leg 10’ and two arms 11', ~1-1”, offset in height
and bent towards one another, and terminal bevels 13.
The leg 10’ has an inflection 24 forming an angled por
tion thereon. In this embodiment, plane leaf springs 25’
other to achieve ltheir initial stress.
3. The expansion band of claim 1, wherein the ends
of said arms are beveled inwardly, whereby when pushed
onto the leaf spring said amis are guided one to each
4. The expansion band of claim 1, wherein the body
links are independent of each other, and each lleaf spring
has Itwo legs at an obtuse angle in cross section, one of
or 25" (FIGS. 13 and 14), rectangular in outline, are
used, lwhose width substantially corresponds to the com
said clips being connected .to each leg of each leaf spring.
cm-on diagonal running through the two sleeves 16’ and
5. The expansion band of claim 1, wherein said body
16” of the double link 16. These springs have rectangular
links are open ended sleeves and those in one layer have
recesses 26, in fthe same longitudinal side in spring 25’
terminal portions of their longitudinal walls bent into
(FIG. '13) and in opposite Ilongitudinal sides in spring
the sleeve lopenings, the :other arm «off each clip having la
2‘5” (FIG. 14), 'and two bores 27 in their center for 30 recess at its edge opposing the longitudinal wall of the
achieving a smooth spring action.
sleeve near the bight portion »of the clip for accommo
The leaf springs 25’ are inserted longitudinally into
dating said terminal portions.
the double links 16 in alignment with the diagonal of
l6. The expansion band of claim 1, wherein the body
the link sleeves 16', 16” so that their recesses 26 are in
links are double sleeves including 'one fnom the upper
the lower sleeves 16". ’Ihe connecting clips 8" are in 35 layer and one from the lower layer, each leaf spring be
serted with their leg 10 land arms 11', 11" extending
ing planar.
through the side openings of the double link 16. The
7. The expansion band of claim 1, wherein each ‘leaf
upper half `of the Ileaf spring 2-5' is gripped by the two
spring has a recess, and the other leg of each connecting
arms 11’, 11" along its top and bottom surfaces, respec
link is provided with lan inclined portion and an :offset
tively. Due to the initial stress of these two arms and
portion which iit into said recess.
their cooperation with the leaf spring 25', the clips 8"
8. An expansion bracelet, comprising, in combination:
a plurality of main links de‘inlng sleeves disposed in two
rows, said links »being staggered with respect to each
other; connecting links each pivotally connected to a
by its ‘deflection 24 forming the angled pontion when Ibe 45 main link sleeve of each row; leaf springs for the con
ing inserted into the lower sleeve 16” of the link, «and is
necting links, one leaf spring being Idisposed in each sleeve
pushed into engagement therewith and secures the connec
of at least lone row, each connecting link being generally
tion of the three band components, double link 16, con
U-shaped and having one leg pivotally connected to the
necting clip v8, and leaf spring 25’. The double links 16
50 sleeve fof a main link in one row and another leg pivot
are contracted in :the longitudinal direction of the band,
ally connected to the sleeve yof another main link in an
thereby shortening the bracelet. Yet ‘the bracelet may
other row, Ione leg of each connecting link being resilient
be expanded against the action of the arms »11', 11" and
and split 4by :a longitudinal slit thereby to form two Áarms
are biased in the direction toward lthat side of the clip
which has the higher -arm 11’. The clip 8" is brought
linto engagement with the recess 26 of the leaf spring 25'
leaf spring 25', the `double links 16 thereby moving away
which are ioifset from each other in one direction trans
from one another, which is facilitated, as is their gliding 55 versely of said slit, said arms when unstressed being
into one another, by the oblique center flanges 22, 23'.
spaced apart for at least a portion of their lengths in an
'If the leaf springs 25" (FIG. 13) with recesses on .the
other direction transversely of said slit a distance less
opposite longitudinal side are used, the connecting clips
than the thickness of the leaf spring, said arms resiliently
8 are accordingly arranged at the two edge sides of the
engaging said leaf spring one on each side, said arms ex
bracelet inversely regarding «their leg 10’ and 'their arms 60 tending over said sides and thereby being stressed and
11', 11".
biasing the connecting links and thus the sleeves toward
It will be runderstood that the above description of the
each other, and means on the other leg of each connect- ,
present invention is susceptible to various modifications,
ing link pivotallly cooperable with the sleeve 0f one of
changes, and adaptations, and the same are intended Ito
said main links whereby the bracelet may be expanded
be comprehended within »the meaning and range of equiva 65 against the spring action `of the stressed arms and the
lents of the .appended claims.
leaf spring, said bracelet including means for maintain
I claim:
1. An expansion band, comprising, in combination:
ing said connecting links in their assembled positions.
9. rIlhe expansion bracelet of claim 8, wherein said
a plurality of body links arranged to form -two ylayers of
arms are connected to the bight portion of each connect
sleeves, 4said links being staggered with respect to each 70
link at different distances from said Iother leg and
other; a plurality of leaf springs disposed one in each of
lare bent toward each other and stressed when engaging
the sleeves of .at least one layer; and a plurality of con
said ‘leaf spring. l'
necting links in the form of U-shaped clips, said connect
10. The expansion bracelet of claim 8, wherein s_aid
ing links connecting each said body link -to a respective
means includes an angled portion on said other [leg diS
‘next adjacent body link, each said connecting link hav 75 posed in a recess in another of said leaf springs.
1l. The expansion bracelet of claim 8, wherein said
means includes a notch in said other leg accommodating
a ñange `on the cooperating sleeves.
when unstressed being spaced apart for at least a por
tion of their lengths in 'another direction transversely of
said slit a distance less than the thickness of the leaf
spring means, and said arms are disposed ‘one on each
12. In an expansion band including ‘hollow links, in
termediate links flexibly and expansibly connecting the 5 side ‘of each lleaf spring means and t-hus :have 'an initial
stress directed against each leaf spring means.
hollow llinks together, the «hollow links defining sleeves
disposed in two layers, the hollow links being staggered
References Cited in the tile of this patent
with respect to each other, the intermediate links being
U-shaped clips ihaving one leg disposed in a sleeve o-Í
one `layer and the other leg disposed in an adjacent sleeve 10 2,689,450
Stiegele ____________ __ Sept. 21, 1954
of the other layer, a plurality ott leaf spring means dis
posed one in each of the sleeves of `one layer for biasing
the ëhollow links toward each other, and the band includ
Bartholoma et al. ____ __ Dec. 29, 1959
Sasaki ______________ __ Oct. 25, 1960
Germany ____________ __ Sept. 12, 1955
Great Britain _________ __ Mar. 9, 1960
ing means for maintaining said connecting links in their
`assembled positions, the improvement that: said clips 15
each has one leg which is resilient tand split fby a longi
tudinal slit to form two arms which rare oiîset from each
other in one ‘direction traversely of said slit, said arms
Patent N0. 3,099,908
August 6, 1963
Kur-t Wolfínger
It is hereby certified that errer appears in Jthe above numbered pet
en‘t requiring correction and that the said Letters Patent should read as
corres ted below .
In the grant, line 1, and in the heading to the printed
specification, line 4, for "Kr-ies Calw", each occurrence, read
Signed and Sealed this 21st day of January 1964.
f [test:
Attesting Officer
AC ting
Commissioner of Patents
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