EJECTEUR DE MATELAS SUR MOULE

MATTRESS MOLD EJECTION DEVICE

Abrégé anglais

Abstract of the Disclosure
A mold having an air injection device attached
centrally to the bottom, said air injection device
comprising an air actuated piston that goes backwards
and forwards to allow air ingress into the mold.

Revendications

The embodiments of the invention in which an exclusive
property or privilege is claimed are defined as follows:
CLAIM:
1. A mold having an air injection device attached
centrally to the bottom of said mold, said device
comprising an air cylinder having a piston ram movable
longitudinal therein and a bolt screwed into an end of
the air cylinder, said ram having a head on one end
thereof adapted to close an opening through the bottom
of said mold when said head is flush with the inside
surface of the mold and having a piston on the other
end thereof actuatable by an adjustable spring, said
piston having a pair of cooperating bosses, the boss
the farthest removed from the head being in contact
with said spring to move the head into said opening
to close said opening, and an air line to admit air
into said cylinder to move the boss nearest the head to
the exhaust position.

Description

S 0 1 2
This invention relates to a large mold and means
for ~jectlng the molding product from the mold and to the
method of using said mold.
In molding large objects having dimensions of
several feet, difficulty has been experienced from time
to time in breaking the molded article away from the mold
and spreading air between -the molded article and the mold
to acilitate its ready removal from the mold.
An aspect of the invention is as follows:
A mold having an air injection device attached
centrally to the bottom of said mold, said device
comprising an air',cylinder having a piston ram movable
longitudinal therein and a bolt screwed into an end o~
the air cylinder, said ram having a head on one end
thereof adapted to close an opening through the bottom
of said mold when said head is flush with the inside
surface of the mold and having a piston on the other
end thereof actuatable by an adjustable spring, said
piston having a pair of cooperating bosses, the boss
the farthest removed from the head being in contact
with said spring to move the head into said opening
~o alose said op~n:lng, and an air line to admit air
into said cylinder ~Q movQ the boss nearest thQ head to
the e~haust po~ition.
The nature of t~is lnv~n~i.on may more readlly
be understood and appreclated with lts advantages by
re~erence to the drawings wherein:
Fig. 1 is a partial seckion ~hrough essentially
the central part of a mold 1tted with a skrlpping
means shown in partial enlarged cross-section; and
Fig. 2 is a vertical cross-sectional vie~ through
the piston chamber of the air injection and strippi.ng
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Referring more speciflcally to Fig. 1, the numeral
3 designates the mold having an opening 4 in the central
part of the bottom of sald mold, fitted with an air
injection or stripping device. The air hole 4 of the
mold is closed or stopped when the head 9 of the piston
5 is in its extended position. Thus the face or top
of the piston 6 will be ~lush with the inside surface 7
o~ the mold. It should be noted that the air in~ection
device is composed o~ a ram 10 having a head 9 fitted
within a piston cylinder 8. A spring means 10 positioned
on and over the lower extremity of the piston ram urges
the piston ram upward into close position
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relative to -the hole 4 of the mold. The cylinder 8 is fit-
ted on the outside with threads 11 to permit the cylinder to
be screwed into the bottom o~ the mold 12, which also con-
tains corresponding threads 13. Thus the bottom of the mold
acts as a nut for -the screw o~ the air cylinder to permit it
to be attached -thereto. The lower extremity of the air
cylinder is shown as enlarged and screw threads 14 cut
therein to permit a screw 15 such as the one shown m Fig.
1 to be screwed into the screwed roll 16 of the'cyl:inder
and thus adjusts -the tension on the spring 1~ resting on
the head 17 of the screw and against the boss 19 of the ram.
m e air cylinder has two openings, 20 and 21, one to receive
an air hose 22 wherein air can be admitted to the cylinder
and the force o~ the air will act upon the upper boss 23 to
cause the piston to move downward against the force of the
spring 18 to operL the hole 4 in the bottom of the mold. As
the piston moves downward the air will escape through hole
4 into the cavity of the mold and since the hole 4 is essen-
tially in the center o~ the mold it will cause the molded
article to be separa-ted from the mold and as the air works
its way to the outer edges of the mold, it will loosen the
molded article Prom the mold and permit it to be readily
stripped from -the mold cavi-ty,
When a~r p,ressure is shut o~f, the spring will act
on ~he bo~s to move the ram upward to close -the hole 4 in the
mold a-t,the time -the piston h~ad contacts -the tapered sldes
o:f hol~ 4.
A single or double bed mattress mold ~itted wi-th the
deviG~ o~ Figs. 1 and ~ was used -to mold polyurethane ~oam

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mattresses. This mattress was readily stripped from the mold
by admitting air through line 22 to the air cylinder at pres-
sures of about 5 to 50 pounds per square inch -to break the
mattress away from the mold. Then the lid was released and
opened. This caused -the air pressure re-tained between the
mattress and mold to èxpand and resulted in essentially pop-
ping the mattre~s upward ~rom the mold.` Af-ter the mattress
has popped loose from the mold i-t can be readily li~ted out
and prepared for shlpping.
While certain represen-tative embodiments and details
have been shown for the purpose of illustrating the
invention it will be apparent to those skilled in this art
tha-t various changes and modifications may be made therein
without departing ~rom the spirit or scope of the invention.