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Патент USA US2117395

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May 17, 1938.
` s. o. BIGNEY
2,117,395
ExPANsIBLß CHAIN STRUCTURE
Filed Feb. 2 1938
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BY
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2,117,395
Patented May 17, 1938
UNiTED STATES
PATENT oEFlcE
2,117,395
`
.
EXPANSIBLE CHAIN STRUCTURE
Sidney 0. Bigney, Attleboro, Mass., assignor to
S. 0. Bigney & Company, a corporation of
Massachusetts
Application February 2, 1938, Serial No. 188,272
7 Claims.
lThis invention relates to an expansible chain
of a character particularly adapted for use as
a bracelet; and has for one of its objects the
provision of an arrangement which will be elas
5 tically extendible a. sufficient amount so that the
encircling length may be enlarged to an extent
to permit the same to easily pass over the hand
of the user to and from position on the wrist.
Another object of the invention is to provide
(c1. ssa-Q80)
tract completely to` snugly fit the wrist without
binding thereon; and in order to accomplish
these results the arrangement of the Springs in
the bracelet is of importance. I have provided
two springs whose combined action permit of this 5
expansion without a great deal of tension and
yet completely contract the bracelet when the
expanding force has been relieved; and the fol
lowing is a more detailed description of the pres
ent embodiment of this invention, illustrating the 10
ible and yet will be sufficiently elastic to return preferred means by which these advantageous re
to contracted position that it may be snug about sults may be accomplished:
With reference to the drawing, the chain des
the wrist without binding on the wrist.
ignated generally |5 is composed of a plurality
Another object of the invention is to so ar
of units I6, such `as indicated in Fig. 7. These 15
15 range the elastic means, such as springs, that - units are connected together by rings ll pass
their action will be more efficient than in similar
structures which have heretofore been provided. ing through openings I8 in the ends of links
Another object of the invention is the provision which form part of the unit, and as each of these
of a structure which will sufficiently close when units is the same the description of one will suf
10 an extendible chain which will be easily extend
contracted so that wide spaces will not be pro
O vided between its parts that the hand may be
viewed.
Vïith these and other objects in View, the in
vention consists of certain novel features of‘con
2 struction, as will be more fully described, and
particularly pointed out in the appended claims.
‘ in the accompanying drawing:
`
Fig. l is a side elevation indicating an encir
cling structure with a few of the parts in full
lines and the remainder represented by dotted
30
lines;
Fig. 2 is a top plan View of a length of the
chain structure;
Fig. 3 is a bottom plan View thereof;
35
4: is a top plan View of the structure in
expanded position;
Fig. 5 is a sectional view on line 5-5 of Fig. 2;
Fig. 6 is a sectional View on line 5_6 of Fig. 2;
Fig. 'l is a sectional View looldng into one of
40 the hollow bars or body members with the link
members shown in their relative positions there
in, this section being taken on substantially line
'l-1 of Fig. 6;
Fig. 8 is a sectional view on substantially line
45 8-8 of Fig. '7;
Fig. 9 is a perspective View of one of the link
members;
'
Fig. 10 is a perspective View of one of the
plate members;
50
Fig. 1l is a perspective view of one of the
springs;
Fig. 12 is a perspective view of the pivot pin.
In the use of bracelet structures it is desirable
that the bracelet expand Without a great amount
of tension being applied to the parts, that it con
55
fice.
'
A hollow body member or bar 2li is formed by 20
drawing up sheet stock and Striking the same
to deilect the stock and provide indentations oi
ornamental form in the face or top wall 2l there
of, while side walls or flanges 22 at the ends 23
along the longitudinal extent are provided to
form a cup-shaped structure. The ornamenta~
tion 2| formed as stated to provide depressions
in the outer surface causes projections 24 on the
inner surface of the top wall 2| which serve to
support a plate 25 therein in spaced relation.
Slots 26 are provided in the flanges or walls
23 and through these opposite slots 26 there eX
tend a pair of Z~shaped link members 21 in su~
perimposed relation. These Z-shaped links have 35
their middle portions 28 in contiguous relation
while their end arms 2S extend in opposite di
rections from the ends of the middle portion and
in opposite directions from each other. A pivot
pin 30 extends through the openings 3| in the 40
Z-shaped connecting links and also through the
plate 25 and through a companion plate 32 on
the opposite side of the links to pivotally relate
the links together and also pivotally relate the
links with reference to the plates 25 and 32
which engage the opposite side and end walls or
ñanges 22 and 23.
Springs 33 are positioned between the plates
25 and 32 and between the end flanges 22 and
the middle portions 28 of the Z-shaped connect 50
ing links so as to act between the end walls 22
and the Z-shaped connecting links tending to
swing the connecting links so as to position the
middle portion 2B of the links generally at right
angles to the axis of the hollow body links or in 55
2
2,117,395
the position shown in Fig. '7. 'I'his is accom
plished particularly well by reason of the gen
erally square-shaped springs shown in Fig. 11
as the portions 35 and 33 of these springs each
will engage the edge of the Z-shaped connecting
link as at 3l' and 38 so that each spring acts
upon both links tending to swing it about its
pivot until the center portions of the links are
in registry or alignment when of course the ac
10 tion of the springs will cease. It will, therefore,
be apparent that a single spring would cause
both links to operate but by reason of the fact
that there are two springs the eiîective action in
moving the links is increased and yet soft springs
15 or those requiring a minimum amount of tension
to extend them may be provided.
The domed back wall 39 is positioned within
the flanges or walls 22 and 23 of the hollow body
link and the edges ¿lll of these flanges rolled in
20 to maintain this back in place and also hold the
plate 32 in a desired position for guiding of the
springs in their action.
The pivot pin 30 is of
suñicient length so that riveting over is unneces
sary, it being prevented from the escape by the
25 top or front wall 2i and also by the back wall 39.
When the units IS are connected together a
pull on the chain will cause the links to move
from the position shown in Fig. 2 to the position
shown in Fig. 4 and when such tension is relieved
30 the springs will swingthe links back again to the
position shown in Fig. 2, thereby contracting the
encircling size of the bracelet.
The foregoing description is directed solely to
wards the construction illustrated, but I desire
35 it to be understood that I reserve the privilege
of resorting to all the mechanical changes to
which the device is susceptible, the invention
being defined and limited only by the terms of
the appended claims.
40
I claim:
1. An expansible chain structure comprising a
series of connected units, 4each unit comprising
a hollow body member, a pair of links crossed
within said body and each extending through
45 opposite sides of the body and movable with re
lation to each other and to said member from a
contracted to an expanded position, and a spring
in each member acting on both of said links to
move them to contracted position.
2. An expansible chain structure comprising a
series of connected units, each unit comprising
a hollow body member, a pair of links crossed
within said body and each extending through
opposite sides of the body and movable with re
lation to each other and to said member from a
contracted to an expanded position, and a pair
of springs in each member each acting on both
of said links to move them tov contracted position.
3. An exp-ansible chain structure comprising a 10
series of connected units, each unit comprising
a hollow body member, a pair of links crossed
within said body and each extending through
opposite sides of the body and movable with re
lation to each other and to said member from a 15
contracted to an expanded position, and a coiled
spring in each member acting on both of said
links to move them to contracted position.
4. An expansible chain structure comprising a
series of connected units, each 'unit comprising 20
a hollow body member, a pair of links crossed
Within said body and each extending through
opposite sides of the body and movable with re
lation to each other and to said member from a
contracted to an expanded position, and a pair 25
of coiled springs in each member each acting on
both of said links to move them to contracted
position.
5. An expansible chain structure comprising a
series of connected units, each unit comprising 30
a pair of links pivoted together, a hollow body
containing said pivot and a portion of said links,
and a spring within said body acting simulta
neously on both of said links.
6. An expansible chain structure comprising a 35
series of connected units, each unit comprising
a pair of crossed links pivoted together, a hol
low body containing said pivot and a portion of
said links with the opposite ends extending out
wardly on opposite sides of said body, and a 40
spring within said body acting simultaneously
on both of said links.
7. An expansible chain structure comprising a
series of connected units, each unit comprising
a pair of links pivoted together, a hollow body
containing said pivot and a portion of said links, 45
and a pair of springs within said body each act
ing simultaneously on both of said links.
SIDNEY O. BIGNEY.
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