Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Means permitting removal or substitution of elements during...
Patent
1986-04-15
1987-11-03
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Means permitting removal or substitution of elements during...
425192R, 425567, B29C 4517
Patent
active
047040785
ABSTRACT:
An injection molding machine has an exchangeable working unit including an injection mold assembly and a plasticizing unit. The latter has a plasticizing cylinder and a feed screw. The machine further has a drive, including a spindle for imparting a rotation and a periodic axial shifting motion to the feed screw. There is further provided a coupling assembly for operatively connecting the feed screw to and disconnecting it from the spindle. The coupling assembly has radially displaceable locking bolts, springs urging the locking bolts into a locking position, a radially guided expander wedge driving the locking bolts away from one another into a releasing position, a radially oriented piston-and-cylinder unit for moving the expander wedge between the locking bolts and an axially displaceable radial coupling. The feed screw shaft has a circumferential groove into which the locking bolts project in their locking position, for axially immobilizing the feed screw relative to the spindle. The feed screw shaft also has a radial recess for receiving the radial coupling for torque-transmittingly connecting the feed screw with the spindle. The machine also has an orienting device for stopping a common rotation of the bolts and the radial coupling in a desired angular position of the radial clearance between the locking bolts in which the clearance is oriented parallel to the working direction of the radially oriented piston-and-cylinder unit.
REFERENCES:
patent: 3510915 (1970-05-01), Johansson
patent: 3594869 (1971-07-01), Sher
patent: 4116599 (1978-09-01), Ruegg
patent: 4473346 (1984-09-01), Hehl
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