Static molds – Core – Including means to expand or contract core
Patent
1987-09-23
1989-07-18
Nozick, Bernard
Static molds
Core
Including means to expand or contract core
425417, 156420, B28B 1730
Patent
active
048487201
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to devices for producing annular-shaped polymer articles.
2. Description of the Prior Art
Known in the present state of the art is a device for producing polymer articles, comprising a hub and a cylinder-shaped body arranged around the hub, a blank or parison from polymeric materials being set on said cylinder-shaped body, which is made up of a number of sectors, some of which are rigidly coupled to the hub, while other (movable) sectors are associated with the hub through a train of levers enabling the sectors to move radially and axially with respect to the hub. The hub is a tubular structure accommodating an axially traversable pusher having its ends extending beyond the hub limits as far as the stops secured on the movable sectors so as to interact with said stops in order to move said sectors. The pusher ends and the stops are at right angles to the hub axis. The pusher receives motion from a stationary fixed rod which is actuated by a device for stripping a finished annular-shaped article off the body, when the device is let down onto the rod. The cylinder-shaped body is closed from above and from below with detachable lids (cf., e.g., USSR Inventor's Certificate No. 1,087,358 published in the bulletin `Discoveries, inventions, industrial designs and trade-marks` No. 15, 1984).
A disadvantage inherent in the device discussed above resides in the fact that, owing to the horizontal arrangement of the pusher ends and the stops, a considerable force must be applied to the pusher to separate a finished article from the movable sectors, since said force is directed practically normally to the direction of application of the radial separating force.
SUMMARY OF THE INVENTION
The invention is aimed to provide a device for producing annular-shaped polymer articles, wherein the sectors and the pusher have a construction or arrangement that facilitates stripping of finished annular-shaped articles and extends the processing capabilities of the device.
The object of the invention is accomplished by a device for producing annular-shaped polymer articles, comprising a hub and a cylinder-shaped body arranged round the hub and made up of a number of sectors, some of which being coupled rigidly to the hub, while the other sectors are associated with the hub movably relative thereto, and a pusher arranged in the hub axially therewith and adapted to interact, while traversing, through its ends which extend towards the other sectors, with stops secured on the other sectors in order to move said sectors with respect to the hub. According to the invention, the stops are held to said other sectors at angles less than 90 degrees with the direction of the pusher movement when said other sectors are being brought together.
It is expedient that the pusher ends interacting with the stops be bent out at an angle equal to the angle of the stop inclination.
Such a construction of the pusher increases the radial forces applied to the other movable sectors at the instant when they are stripped from a finished article in response to an axial force applied to the pusher.
It is also expedient that the stop be of a stepped design, the first step, as along the direction of the pusher traverse, be much shorter than the second step, and the angle of inclination of the first step be much less than that of the second step, and that rollers be provided at the pusher ends, adapted to interact with the steps of the stop when the pusher is traversing.
Such a construction of the pusher enables a considerable radial force to be developed at the beginning of the bringing the other (movable) sectors together, necessary for the other sectors to separate from the finished article; it also makes it possible to impart radial movement, when the pusher travels over the second step of the pusher, to the other sectors over a greater length, which is required for a considerable reduction of the perimeter of the device.
It is likewise expedient that the stop be shaped as a
Boikov Vladimir P.
Gorodnichev Jury N.
Guskov Valery V.
Kozachevsky Gennady G.
Moroz Viktor A.
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