Title:
【発明の名称】スクリュー溝内の圧力を変化させる装置
Document Type and Number:
Japanese Patent JPH06501209
Kind Code:
A
Abstract:
An improved apparatus for varying the pressure within a screw channel which apparatus includes a shaft having a helical flight defining a channel between consecutive turns of the flight. The screw is rotatable within a barrel. A radially movable first member is disposed at a right angle to a longitudinal axis of the screw where the plasticated material has undergone partial melting. A reciprocatively movable second member is disposed within a bore through the shaft coaxial with the axis and includes a cam slidably engaged with an inner end of the first member such that the first member can be extended into the screw channel when the second member is moved in one direction and retracted from the channel when the second member is moved in another direction. At an upstream end of the second member there is provided a rotatable thrust transmitting coupling which allows rotation of the second member relative to a male threaded portion secured to the coupling and coaxial with the second member. The male threaded portion is engageable with a fixed female threaded portion. An adjusting flat is provided on the male threaded portion. There is also provided apparatus for automatically maintaining a predetermined pressure or temperature in a screw channel.
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Inventors:
Dray, Robert F
Application Number:
JP51212691A
Publication Date:
February 10, 1994
Filing Date:
July 12, 1991
Export Citation:
Assignee:
Dray, Robert F
International Classes:
B29B7/30; B29B7/38; B29B7/42; B29B7/58; B29C45/48; B29C45/60; B29C48/395; B29C48/92; B29C48/03; (IPC1-7): B29B7/30; B29B7/42; B29B7/58; B29C47/36; B29C47/92
Attorney, Agent or Firm:
Akira Asamura (3 outside)