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Патент USA US2403780

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July 9, 1946.‘
Filed Mar
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Patented July 9, 1946 Q
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‘5 3 “Nicholas Barbieri,'ProvidencalR. I.,, assignor to:
Uncas Manufacturing>
Company, acorporation
of :Rhode Island ‘
ApplicationMarch 16, 1944,: Serial repairer [- T
j v1 Claim. (01. 18-42‘)
' 1410i Fig.1 4 and illustrating theirecess‘for
relates-‘to a mold forv'an ex
This invention
tensible article such for‘in'stance as a‘ bracelet
plastic material.
have been formed' of one in
tegral piece of material, such for instance as in
the form of a band, or in sections connected to
gether by some other means, such for instance
as metal parts, hinges, elastic bands, or the like,
when one part is designed to move relative to‘
another. The formation of separate parts ‘and
attaching them together is a laborious and pains
. 11 .
' ‘Fig. 9'is'a section on line' ‘9-1-9 of Fig; 3"sho'w,-'
ing the gate to the recesses;
Fig, 10 is a sectional view with the casting
removed from the die;
Fig. 11 is a plan view of the casting with the
gate removed and taken from the die but showing
10 the strip material in position in the cast product.
In proceeding with this invention I provide
recesses in the faces of two dies which are
brought together with the removable core be
taking work and results in a correspondingly ex
pensive article when completed.
@Fi'gliB ,is'a view ‘of the ‘bar; 1
tween so that when the core is in position the g
One of the objects of this invention is to pro
vide by molding in a single piece an extensible 15 ' connection between the recesses will follow sub
stantially the path of a distorted or ‘?attened
bracelet and the formation of a mold which will
helix- After. injecting into such recesses a plastic
accomplish this result.
material and allowing‘the same to set the die
Another object of this invention is to provide
parts may be removed leaving the helix cast
a mold the recesses of which form the shape of
the article which is exposed to view, and which 20' about the core. The coremay then be removed
leaving the ?attened distorted helix in the form
recesses may be varied in shape that various ap
pearances may be had in the article which is
taken from the mold.
With reference to the drawing, l0 designates
Another object of this inventionis to provide
a mold whichwill have a removable strip or bar
which acts as a core for the article molded so
that articles somewhat in the form of ‘a helix
or a ?attened helix may be formed when desired
one die, shown in Figs. 4, 5, and 7, which is pro
vided-with a plurality of recesses“ of the depth
shown more clearly in Fig. 5 with shallower re
cesses l2, shown more clearly in'Fig. 7, both
formed in the faces l3 of the die I0. The re
cesses II have a peripheral outline as illustrated
with the center portion which forms into shape
best in Fig. 4 with a bevel [4 along the edges of
the parts about the core removable from the 80 each of the recesses.
?nished construction.
The die l5 as shown in Figs. 3 and 5 is provid- ‘
Another object of this invention is to provide
ed with a plurality of recesses l6 which are
a mold suitable for injection wherein the plastic
shaped as best shown in Fig. 3, each separated
material which is molded is forced into the mold
one from the other. A gate I1 is also in the face
under heat and pressure or under heat and then 35 I 8 of this'die. This face [8 is grooved for con
allowed to cool and set into the form desired.
, tact with the face l3, both being ground?at s0
With these and other objects in view, the in
as to provide good mating surfaces. A remov
vention consists of certain novel features of con
able strip of ribbon-like form designated 19, and
struction, as will be more fully described and
40 shown in section in Figs. 6 and 8, is of a thick
particularly pointed out in the appended claim.
ness substantially the depth of the recess l2 so
In the accompanying drawing:
as‘to ‘lie therein and separate the main portions
Fig. 1 is a top plan'view of the article which
of the recesses II and IS in the opposite faces of
is desired to be molded;
the-dies Ill and I 5.
Fig. 2 is an edge view thereof; . .
Fig. 3 is a face view of one'of the dies of the
The recesses .II are arranged at an angle to
the edges of the strip or bar l9 or else have their
ends 20, offset ‘from the body portion ofthe re
Fig. 4 is a face view of the companion die;
cess which vextends at right angles to the edges
Fig. 5 is a central sectional view of the dies
of the‘bar I 9, which provides a functional reason
shown in Figs. 3and 4 positioned together face to 50 for the/shape shown in Fig. 4.
The shape of the recesses [6 in the die l5 also
Fig. 6 is a section similar to Fig. 5 illustrating
have a functional value in that the end portions
the removable strip ‘or. bar which is positioned
2| of these recesses I6 also extend at an angle
between the two dies;
Fig. 7 is a sectional view substantially on line
to the edges of the strip IS. The effect of this
arrangement is such that the end portions 20'
of the recesses ll connect with the end portions
of the recesses I6 when the dies 10 and [5 are
placed together as shown in Figs. 5 and 6 par
ticularly as illustrated in Fig. 9. Thus the ar
rangement is such that the end portions of the
recess I6 will connect one end portion of a re
cess l I with the-end portion at the opposite side
of the mold of the next recess H and progressive
ly this connection occurs somewhat after the
manner of a distorted‘ or ?attened helix so that‘
a cork screw-like passage about the strip’v l9v
a core is formed from one end of the die to the '
In molding, the plastic material tov be molded;
is removed from the center of the molded struc
ture providing the ?nished form of the article.
The construction follows the shape of a ?at
tened helix and is extendible in the direction of
its length by a certain resiliency which ‘is inher
ent in the material of which it, is molded.
I‘ claim:
A mold comprising a pair of dies with faces in
contact with each other, each face having a se
"ries of recesses, the dividing walls of the two se
ries of. recesses ‘being out of alignment with each
other, a removable strip of ribbon-like form, rec
tangular in cross vsection and having a smooth
. unbroken. surface extending between said dies
which is used in an injection mold,'is inserted 15 separating the mid portions of said recesses and
through the gate l1 and will exude in both di
leaving the, end portions of one recess opening
into the ‘end portions of two adjacent recesses
rections as shown in Fig. 9 until the recesses are
completely ?lled and a formation about the cen
in the face of the opposite die and the two series
of recesses being so shaped and disposed as to
tral strip [9 providing portions 22 and‘23, such as
shown in Fig. 11, is provided. The mold .is then 20 form together. with said strip a continuous sub
stantially ?attened helical path in said pair of
allowed to set and after the material is hard
ened the two dies I0 and [5 are separated, the
gate 25 is removed from position and the strip" [9
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