Page 2 - Combined_2_OCR

NEW IDEAS
Mating Spray Cans Produce Instant Foam
In this packaging technique for dispensing polyurethane foam,
the valve stem on one spray can containing the catalyst and
blowing agent is inserted in the opening in the second can
containing the base resin. Pressing the cans together sprays
the contents of the first can into the second. After shaking
for proper mixing, the second can is ready to dispense the
activated foam through a snap-in snorkel. Can contents must
<% be used immediately, it is not reusable. Distributed by Edmund
Scientific Co., 555 Edscorp Bldg., Barrington, N. J. 08007, the
rigid-foam system is used in relatively small quantities for
insulating, repairing, sealing, filling, or making art objects.

Second can

Transfer
Snorkel Circle 563

Quick-Release Pin
Stays Locked Under Pressure
Shown in the locked position, this
quick-releasing pin is withdrawn by de­
pressing the pushbutton plunger to drop
the detent balls from the sleeve into
the plunger groove. However, with any
stress in the joint, the sleeve wants
to remain in position when the plunger
drops the balls. Trying to pull out the
pin in this condition merely com­
presses the handle spring, displacing
the plunger with respect to the sleeve
(out of unlocking range) and popping
the balls right back into the locking
position. A forged stop on the plunger
end foils deliberate attempts to cir­
cumvent the safety-locking feature by
driving the plunger out backwards.
Thus, the fastener is foolproof (at least
for ordinary fools). Fastener developed
at North American Rockwell Corp., for
NASA’s Marshall Space Flight Center
(MFS-18495).
86 Machine Design