U.S. patent number 3,846,976 [Application Number 05/405,592] was granted by the patent office on 1974-11-12 for expansion bracelet.
This patent grant is currently assigned to Rodi & Wienenberger Aktiengesellschaft. Invention is credited to Rolf Schaudel.
United States Patent |
3,846,976 |
Schaudel |
November 12, 1974 |
EXPANSION BRACELET
Abstract
An expansion bracelet, particularly for wristwatches, has a row
of connected links. Each of these links has a plate member, a pair
of solid outer members connected to said plate member at opposite
lateral sides thereof, as seen with respect to the elongation of
the row, and a solid inner member which is located between the
outer members and partly projects beyond them in longitudinal
direction of the row. The inner member has an underside which faces
towards the plate member and is provided with a pair of
transversely extending channels. A pair of substantially C-shaped
brackets are provided, each having a bight portion pivotably
received in one of the channels, and a pair of leg portions. The
leg portions of one of the brackets are pivotably connected to the
plate member so that this one bracket can be tilted longitudinally
of the row out from between the outer members of the link. A pair
of biassing springs are provided, each surrounding one of the bight
portions. The biassing spring associated with the one bracket
permanently opposes the tilting of the latter. The other bracket is
connected in the same manner with a plate member of adjacent link,
and its associated biassing spring also opposes its tilting.
Inventors: |
Schaudel; Rolf
(Karlsbad-Langensteinbach, DT) |
Assignee: |
Rodi & Wienenberger
Aktiengesellschaft (Pforzheim, DT)
|
Family
ID: |
5860606 |
Appl.
No.: |
05/405,592 |
Filed: |
October 11, 1973 |
Foreign Application Priority Data
Current U.S.
Class: |
59/79.1 |
Current CPC
Class: |
A44C
5/08 (20130101); A44C 5/04 (20130101) |
Current International
Class: |
A44C
5/08 (20060101); A44C 5/00 (20060101); A44C
5/04 (20060101); F16g 013/24 () |
Field of
Search: |
;59/79R ;63/5R,11R
;224/4B,4D,4H |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
380,997 |
|
Oct 1964 |
|
CH |
|
483,714 |
|
Jun 1952 |
|
CA |
|
1,023,619 |
|
Jan 1958 |
|
DT |
|
Primary Examiner: Lanham; C. W.
Assistant Examiner: Combs; E. M.
Attorney, Agent or Firm: Striker; Michael S.
Claims
What is claimed as new and desired to be protected by Letters
Patent is set forth in the appended
1. An expansion bracelet, particularly for wristwatches, comprising
a row of connected links, each of said links comprising a plate
member having a pair of first edge portions extending transversely
of said row, and a pair of second edge portions extending
longitudinally of said row; a pair of solid outer members each
connected to one of said second edge portions and being spaced from
one another transversely of said row; a solid inner member located
between said outer members and in part projecting beyond them in
direction longitudinally of said row, said inner member having an
underside facing towards said plate member and provided with a pair
of transversely extending channels; a pair of substantially
C-shaped brackets, each having a bight portion pivotably received
in one of said channels and a pair of leg portions, the leg
portions of one of said brackets being pivotably connected to one
of said first edge portions of said plate member so that said one
bracket can be tilted longitudinally of said row out from between
said outer members; and a pair of biasing springs received in the
respective channels in engagement with the respective brackets and
permanently resisting such tilting thereof.
2. An expansion bracelet as defined in claim 1, said outer members
having respective mutually opposed surfaces each of which is
provided with a slot extending longitudinally of said row; and
wherein each of said second edge portions is received and rigidly
retained in one of said slots.
3. An expansion bracelet as defined in claim 1, wherein said plate
member is of sheet material and formed with at least one
reinforcing profile.
4. An expansion bracelet as defined in claim 1, wherein one of said
first edge portions is formed to tubular configuration and defines
an open-ended passage, and the other of said first edge portions is
formed to hook-shaped configuration and defines a passage which is
open at its ends and also intermediate the latter, said leg
portions of said one bracket being partly received in one of said
passages.
5. An expansion bracelet as defined in claim 4, wherein said leg
portions each include one part which is spaced from and
substantially parallels said bight portion and is received in said
one passage, and another part which connects said one part and said
bight portion and is located between said inner member and a
respective one of said outer members.
6. An expansion bracelet as defined in claim 5, said inner member
having a pair of end faces each of which faces one of said outer
members, and each of said end faces being partly recessed in
direction away from the associated outer member to define with the
same a clearance in which the respective other part is located.
7. An expansion bracelet as defined in claim 5, wherein said
biasing springs are helical springs having spaced ends each of
which is provided with a projection extending transverse to the
elongation of the respective spring, each of said springs
surrounding one of said bight portions under torsional prestress
with one of its projections engaging said inner member and the
other of its projections engaging one of said other parts of the
respective bracket.
8. An expansion bracelet as defined in claim 7, wherein said inner
member is formed in said underside with a pair of slits each of
which communicates with and extends from end to end of one of said
passages.
Description
BACKGROUND OF THE INVENTION
The present invention relates generally to a bracelet, and more
particularly to an expansion bracelet, especially for
wristwatches.
There has recently been a trend towards rather large and heavy
wristwatches, creating a concomitant demand for similarly massive
bracelets, that is watch bands for these watches. It has been
observed that customers refuse to accept bracelets which are in
conventional manner made of formed sheet metal and are hollow,
apparently because they are considered to be too light in weight
and too fragile. Moreover, particularly in the case of
large-dimensioned wristwatches it is desired that the width of the
bracelet be continuously varied, that is that the width increases
continuously from the center of the bracelet towards the opposite
ends thereof which are to be connected with the watch. For reasons
of manufacturing economy this is not possible to do in bracelets
whose links are hollow and formed of sheet metal.
Having recognized these problems, the industry has for some time
now been producing wristwatch bracelets whose links are of solid
cross-section, rather than being hollow and formed of sheet metal.
These solid cross-section links can of course be shaped to obtain a
continuously changing width of the bracelet, and evidently they
have the desired heavier and stronger feeling. However, it has not
heretofore been possible to make bracelets of this type so that
they can be expanded, because the solid cross-section links of the
bracelets did not have the interior space which was previously
present in the hollow sheet-metal links and wherein the springs
were accommodated which make the expansion of these previous
bracelets possible. In many instances this absence of the extension
feature is felt to be a substantial disadvantage. It is now no
longer possible to simply pull the bracelet with the watch onto or
off the wrist; instead, a closure is required which engages two
ends of the bracelet. Of course, whenever the closure is opened or
is closed, there is the danger that the bracelet with the watch may
fall to the ground and become damaged. Moreover, in most instances
the closures are not so reliable as to assure that they cannot come
open accidentally, with a resultant loss of both the watch and the
bracelet. Since the length of the bracelet cannot be changed, that
is since it cannot become expanded, it has also been observed that
if the bracelet is relatively tight and a swelling of the wrist
should occur, for instance in hot weather, the bracelet can exert
an annoying pressure upon the wrist.
SUMMARY OF THE INVENTION
Accordingly, it is a general object of the present invention to
provide an improved bracelet, particularly for wristwatches, which
avoids the aforementioned disadvantages.
More particularly, it is an object of the present invention to
provide such an improved bracelet which combines the advantages of
an expansion bracelet with those of a bracelet composed of solid
links.
In keeping with the above objects, and with others which will
become apparent hereafter, one feature of the invention resides, in
an expansion bracelet, particularly for wristwatches, in a row of
connected links each of which comprises a plate member having a
pair of first edge portions extending transversely of the row, and
a pair of second edge portions extending longitudinally of the row.
A pair of solid outer members are provided, each being connected to
one of the second edge portions and being spaced from one another
transversely of the row. A solid inner member is located between
the outer members and in part project beyond them in direction
longitudinally of the row. The inner member has an underside facing
towards the plate member and provided with a pair of transversely
extending channels. A pair of substantially C-shaped brackets is
provided. Each of these has a bight portion which is pivotably
received in one of the channels and a pair of leg portions. The leg
portions of one of the brackets are pivotably connected to one of
the first edge portions of the plate member so that this one
bracket can be tilted longitudinally of the row out from between
the outer members of the link. A pair of biassing springs are
received in the respective channels in engagement with the
respective brackets, and the one associated with the one bracket
permanently resists the tilting of the same. The other bracket is
to be connected with an adjacent link of the row.
A bracelet so constructed is, evidently, an expansion bracelet with
all the advantages of the same. On the other hand, it has the
desired massive character in that both the outer members and the
inner member are of solid cross-section rather than being hollow
and formed of sheet metal. Aside from the desired weight and
appearance the bracelet can thus be readily configurated in terms
of its surface configuration and of a desired variation of its
width, for instance a continuous variation of the same.
The novel features which are considered as characteristic for the
invention are set forth in particular in the appended claims. The
invention itself, however, both as to its construction and its
method of operation, together with additional objects and
advantages thereof, will be best understood from the following
description of specific embodiments when read in connection with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top view of an expansion bracelet according to the
present invention, in non-expanded condition;
FIG. 2 is a fragmentary top plan detail view, partly in section,
showing a portion of the bracelet in FIG. 1 but in expanded
condition;
FIG. 3 is a partly sectioned side elevation of the portion in FIG.
2; and
FIG. 4 is an exploded perspective view, showing the components of a
link of the novel bracelet.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The drawing illustrates in FIGS. 1-4 one exemplary embodiment of
the invention, shown as a wristwatch expansion bracelet 1. The
bracelet 1 comprises a row of connected links which together form a
center row of members 2 that is bounded laterally by two outer rows
3 composed of members 4 and 4', respectively.
As FIGS. 2-4 show more clearly, each link of the novel expansion
bracelet is composed of one of the solid cross-section inner
members 2 and two of the solid cross-section outer members 4,4'
which are located at the opposite lateral sides of the respective
member 2. There is further provided a plate member 5 extending
transversely of the elongation of the row and having substantially
T-shaped lateral edge portions 6,6' (see FIG. 4) and transverse
edge portions which extend between the edge portions 6,6'. One of
these transverse edge portions is identified with reference numeral
7 and formed to tubular configuration, defining a passage which is
open at its opposite ends. The other transverse edge portion is
identified with reference numeral 8 and formed to hook-shaped
configuration so that the passage which it defines is open not only
at its opposite ends but also laterally.
The plate member 5, which is of sheet metal, is formed with one or
more (only one shown) profiling 9 which serves as a reinforcement
for the plate member 5, i.e., to reinforce it against bending.
The mutually facing edge faces 10 of the members 4,4' are each
provided with a slot 11 extending in parallelism with the
elongation of the row of links, and the end portions 6,6' of the
plate member 5 are each received in one of these slots and rigidly
connected therein, for instance by means of press-forming or the
like. Thus, the members 4,4' and 5 constitute a unit with one
another.
The link further comprises a solid cross-section inner member 2
which in the non-expanded condition of the bracelet (compare FIG.
1) is located halfway between the members 4,4' whereas its other
half projects outwardly from between them in the longitudinal
direction of the bracelet, being located between corresponding
members 4,4' of the next adjacent link. The lateral edge faces
12,12' of each member 2 are partly recessed as indicated in FIG. 4
so that a projection 13 is obtained. Downwardly below the
projections 13 the edge faces 12,12' are provided with a pair of
bores forming passages 14 which each extend from one of the edge
faces to the other. These passages of course extend transversely of
the elongation of the bracelet and it will be seen that in
direction towards the underside of the member 2, that is the side
which faces towards the plate member 5, there are slots 15 provided
which communicate with the passages 14 over the entire length of
the latter. The slots 15 are laterally offset from the respective
central axes of the passages 14.
Each of the passages 14 accommodates a helical spring 16 (only one
shown) which is provided at its opposite ends with transversely
extending projecting portions 17,17'. The purpose of the slots 15
is to permit the ready insertion of these springs 16 into the
respective passages 14, which is accomplished in that the
projection 17 or 17' at that end of the spring 16 which is to be
the leading end as the spring is inserted, is made to move through
the respective slot 15 during such insertion. Each of the passages
14 further coacts with a substantially C-shaped bracket (only one
shown in FIG. 4), a bight portion 19 of which extends through the
respective passage as well as through the spring 16 therein. The
insertion of these brackets, identified with reference numeral 18,
is of course again made possible by the presence of the slots 15.
Each bracket can freely turn within the respective spring 16. The
two leg portions at the opposite ends of the bight portion 19 are
located outside the member 2. One part 20 of each leg portion is
located in the clearance created between the respective members
4,4' and the member 2, due to the presence of the recess in the end
faces 12,12' , and another part 21,21' of the respective leg is
received in either the passage formed by the edge portion 7 or the
passage formed by the edge portion 8. Again, the legs or more
particularly the parts 21,21' thereof, are freely pivotable in
these respective passages. The parts 20 are protected and concealed
from view by the projecting portions 13.
When the components are connected with one another the springs 16
are torsionally stressed, with one of the projections, here the
projection 17, abutting the underside of the associated projection
13, and the other projection 17' abutting the associated part 20 of
the bracket 18. Thus, the bracket 18 is permanently tilted by the
action of the spring 16 to a position inwardly of the link, in
which the member 2 is located halfway between the members 4,4', the
term halfway here referring to the longitudinal direction of the
bracelet. Evidently, when a pull is exerted in longitudinal
direction on the bracelet, the spring action is overcome and the
member 2 is moved outwardly from between the members 4,4' by
tilting of the associated bracket 18 in the corresponding
direction, to the position shown in FIGS. 2 and 3. When the pull is
subsequently relaxed, the spring will restore the member 2 to its
former position.
It goes without saying that the other bracket of each of the
members 2 is similarly connected with a plate member 5 of the next
adjacent link, as is diagrammatically suggested in FIGS. 2 and
3.
It is desirable that these bracelets be adjustable in their length,
to accommodate them to thicker or thinner wrists. According to the
present invention this can be readily done by adding or removing
individual links. It is merely necessary to move the parts 21,21'
of a respective bracket 18 out through the open side 22 of the
passage defined by the hook-shaped edge portion of a plate member
5, so that an entire link can be removed or, conversely, can be
added.
It will be readily appreciated that the present invention thus
avoids the disadvantages which have been outlined with respect to
the prior art, while retaining those features thereof which are
desirable.
It will be understood that each of the elements described above, or
two or more together, may also find a useful application in other
types of constructions differing from the types described
above.
While the invention has been illustrated and described as embodied
in a wristwatch expansion bracelet, it is not intended to be
limited to the details shown, since various modifications and
structural changes may be made without departing in any way from
the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the
gist of the present invention that others can by applying current
knowledge readily adapt it for various applications without
omitting features that, from the standpoint of prior art fairly
constitute essential characteristics of the generic or specific
aspects of this invention and, therefore, such adaptations should
and are intended to be comprehended within the meaning and range of
equivalence of the following claims.
* * * * *