Moulding method and apparatus
OwnerJan Humaninventor
Life of this patent
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Abstract
A method of moulding is disclosed which comprises opening a mould by separating one mould component (16) from another mould component (18) to provide a space which opens upwardly. A lower part of the space is in the form of a well (W). A charge of mouldable material is fed into the space from above so that the charge falls into the well. The mould is closed by displacing the mould components (16, 18) into contact with one another thereby to define a closed moulding cavity which is extended downwardly by the well. The volume of the well is then reduced by displacing a plunger (22) which bounds the bottom of the well relatively to the mould components thereby to displace mouldable material from the well into the moulding cavity and fill said moulding cavity.
Claims17
A method of moulding which comprises opening a mould by separating one mould component from another mould component to provide a space which opens upwardly and a lower part of which space is in the form of a well, feeding a charge of mouldable material into said space from above so that the charge falls into the well, closing the mould by displacing said components into contact with one another thereby to define a closed moulding cavity which is extended downwardly by said well, and reducing the volume of said well by displacing a plunger which bounds the bottom of the well relatively to the mound components thereby to displace mouldable material from said well into said moulding cavity and fill said moulding cavity.
A method as claimed in claim 2 and comprising displacing the plunger upwardly relatively to said mould components to reduce the volume of said well.
Moulding apparatus comprising an upper mould component, a lower mould component, means for displacing said components between a closed position in which they bound a moulding cavity to an open position in which the lower component defines an upwardly open space, a lower part of said space being in the form of a well which, when the mould components are in contact, constitutes a downward extension of said moulding cavity so that it falls into said well, a plunger forming the bottom of said well, and means for displacing said mould components and said plunger relatively to one another thereby to reduce the volume of the well and displace mouldable material out of said well and into said moulding cavity.
A method of moulding which comprises feeding a charge of mouldable material into the cavity of a female mould structure comprising a fixed shaft and a reciprocable female mould, closing said cavity by inserting the spigot of a male mould into said cavity, and displacing said male mould and said female mould with respect to said shaft so that the shaft slides into said cavity, said spigot, an end surface of said shaft and surfaces of the female mould defining a mould cavity having the shape of the article to produced.
A cap comprising a skirt, a transverse end wall at one end of the skirt and a band at the other end of the skirt, the band being connected to the skirt by a plurality of bridges, the inner diameter of the band and the outer diameter of the skirt being such that the skirt can be forced into the band, the portion of the skirt that enters the band having slits therein which are open at the free edge of the skirt.
Dependencies are inferred from the claim text.