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Патент USA US2105593

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Jan. 1s, 193s.
Filed June 18, 19,36
'n «n
Patented Jan. 18, 1938
y 2,105,593>
-»Parr-:rrr OFFICE l
\ william mamon, Gardner, Mass.
Application June 18, 1936, Serial No. 85,999
a' claims'.
My invention relates to improvements in ap
paratus for the vmanufacture of articles molded
from pulpous ñbrous material, its prime objects
_Various press machines may be utilized, but for
the purpose of illustration there is shown a screw
press mechanism of usual form, adapted to co
‘being- to permit faster production a low cost ' operate two dies upon the material to be' formed.
and to eiïect- even, strainless removal of the ar
It includes a lower die member Il) having a recess
ticle without use of complicated apparatus or in
die face II from which a multiplicity of ducts I2
corporation of stiiîening members in the article,
and to prevent distortion due to handling in
cident to its being racked for drying, thereby per
10 mitting faster, less delicate handling with safety,
_ and rapid, _low cost production.
Large and small ‘structural articles of pressed
über pulp material have been found desirable in
the past, but their manufacture heretofore has
15 presented impracticable aspects which have de
stroyed its feasibility in certain lines of manufac
ture. The present invention is designed to over
come the most serious of these difficulties. In
forming an article from the fluid pulp, its strength
or rigidity, and resistance to shear, increases from
nearly zerov when iiuid to a maximum when dried.
Lack of strength is no problem while the pulp is
being formed and compacted in the mold. Dur
- ing ‘its removal from the mold and during the
25 early stages oi’ drying, however. the freshly mold
ed article is quite liable to deformation. Even
a slight disturbance of forms may produce lines
of weakness which are prone to fail later when
the completed article is subjected >to normal
30 stresses of use or its shape may be altered be
yond limits of tolerance.
other faults -it _has been
bed reinforcing members
pense often unwarranted
lead, discharging at the outer surfaces of the die
Standards or tie-bars I3 are anchored at the
sides of the member I0 and support a cross bar 10
I4 through which is engaged the screw I5 which
is journalled in and connected to the upper die
block I6 in such manner as to -protract and re- -
tract it relative to the lower die Ill. The upper
die block I6 is formed with flanges I 'I to stiften
and distribute strains over its top plate I8 and
with a die face I9 formed to define the dimensions
of the finished article in conjunction with the
contours of the lower die face II.
A wire mesh basket 2|! is provided, shaped to zo
contact the die face II of the lower die I0, hav- -
ing a- metal band rim 2i supporting its _upper
edges, and to which rim are' attached resilient
hook members 22. Said hook members 22 are
preferably formed of sheet metal and are oñset
outwardly a distance immediately below the top
of the basket, as at 23, extending thence upwardly
from the rim of the basket a distance, their up
per shank parts being extended perpendicularly
to the plane> of the top plate I8 as at 24. The 30
To obviate these and ' upper end portions are then bent at 25 outwardly
at a slight angle and are then bent sharply in
proposed even to em
ward and downward at 26' and continued to a
in the article-an ex
b_y the market for the level below the bend 25, forming bills 26. The
35 article and which would be unnecessary in a well
made article in which the foregoing objections
are overcome.
extremities of the bills are bent sharply out
wardly forming a wear face 21 paralleling the top
surface of the plate Iß and terminating adjacent
It has also been a problem to eñect the re
moval of the article from its mold, evenly and
.40 rapidly. I attain these and other objects of in
' vention by the embodiment of the principles and
methods herein described, a preferred form of
which is shown and described.
Additional objects, advantages and features of
the vertical portions of the hooks.
In the top plate I8 outside the die face portion
there are formed apertures 28 aligned with re 40
spective hook members 22 in such manner that
the inner edge of each aperture 28 impinges on
the inclined face 26 of the hook 22 when the plate
is lowered, thereby'forcing vit outwardly as the '
hook moves through the aperture 28. When the
portion 21 passes the upper edge of the top plate
It the hook springs inwardly in position to en
lowing description and accompanying drawing. _ gage the face 21 of >the hook against the top of
the plate I8 when the latter reverses its motion
Figure 1 isa vertical cross section of a press and the upper die is being withdrawn from the 50
lower die.
and an article in course ofmanuiacture, in ac
45 invention reside in the construction, arrangement
and combination of parts involvedin the embodi
ment of the invention as will appear from the fol
_ cordance with my invention.
Figure 2 is a plan of the wire-mesh basket.
Figure 3 is a detail of _a modification of the
55 >datent and release means.
The construction places the apex 26 of the
hook initially outward of the inner side of the
opening 28 through which it passes and places
the bill of the hook outside a vertical projec
tion of the upper end edge of the basket (as will
I claim:
1. Apparatus for forming molded pulp articles
comprising a water-passing die, a complemen
appear, this means that the hook is outside the
path of the molded article as it is removed from
, ,
. tary die adapted to coact with the female die to
The modiñcation and improvement shown inj form the plastic material, a basket structure "al
Figure 3 is designed to make the operation of conforming to the article to be formed set be
tween the dies, means to move the dies into and
the press more automatic. Strikes 29 are adjust
out of cooperative relation, and meansron the
basket and movable die constructed to coengage
at initial open position of the dies whereby ter 10
ably attached to the standards I3 adjacent the
hook members 22. Each strike '29 >comprises a
10 clamping and supporting portion 30 adapted to
be añìxed to the standard I3 and a ñnger or
minal relative movement of one die will move the
strike portion 3i placed in alignment with the
inclined faces 26 `of the hooks 22. When the
basket and article irom the other die.
2. In a die press machine of the character de
upper die has been raised a predetermined dis
15 tance suitable to removal of the basket from the
press, the iingers 3i engage the inclined faces
scribed, including a movable press member, a
movable article support in advance of the mov 15
able press member, a resilient hook thereon, said
28 of the respective hooks 22, lpressing them out
wardly and permitting the hooks to be thrust
through the aperture 23, releasing the basket 20,
hook having a bill and an inclined faceuextend
of pulp 2S placed therein after’ which the dies
are operated to compact the pulp, forcing excess
water out through the ducts i2, the hooks 22
named means at forming position of the mov
moving through and past the top plate i8.l The
determined separation movement of the dies.
ing therefrom outwardly and obliquely with re
spect to the path of the movable press member,
means on the movable press member to engage 20
y20 which is then removed and with its content
placed on a rack for drying, or otherwise treated. Y the inclined face on pressing movement of the
The operation is as follows: The basket 2d is movable press member to enter into operative
placed in the lower die and a measured quantity » relation thereto, said bill spaced from the last
dies are separated, the hooks 22 not immediately
engaging, but permitting the upper die i6 to
30 free itself from the molded article 29.
Then the ,
hooks engage the plate I8 and raise the basket
and article 2e from the lower mold die l i. When
suñciently raised the ñngers 3l operate the hooks
22, permitting the basket and contained molded
article to be removed upon a plate or other sup
port inserted _to receive it.
This last named
:means being available in various forms and
comprising no novel part of the present inven
tion is not shown herein. The article is now
e@ dried in any familiar way.
able press member but' inthe path of said means ~
whereby the basket will be lifted after `a. pre- ,
3. In the' structure of claim 2, a strike mem
ber outwardly of the movable press member in
the direction of separating movement of the lat
ter and positioned in line with the inclined face
of said hook, near terminal separating position
of the movable press member but in advance of
said position, whereby the strike member will.
engage the inclined face and move the hook into
disengagine position by outwardmovement of
said movable press member.
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