A pipe fitting comprising a housing ( 10:37:41 ) defining at ore rolled over end thereof an opening ( 36 ) through which it is intended a predetermined diameter pipe ( 28 ) is inserted, in use, with a clearance space between the pipe and the housing, The fitting has a grip-ring ( 19 ) for gripping the pipe ( 28 ) and a pipe support means ( 20:38 ) downstream of the grip-ring and ahead of sealing means ( 21 ). Downstream of the sealing means, are means ( 22:40 ) for limiting movement of the sealing means. The rolled over end of the housing effects engagement of the grip-ring with the housing and thus ensures electrical continuity between an inserted pipe and the housing. Also disclosed is a release tool ( 42 ) for use with the fitting.

A flexible pipe formed by multiple layers of different materials, and one or more vent passages are provided in one of the layers for venting any gases permeating through the pipe.

Method for sealing brickwork of an opening for passage of a pipe in which swelling clay, especially bentonite (8) is forced under pressure and in a gel form in front of or around the wall (4) or opening for passage of a pipe.

In a device and a method for manufacturing wrapped tubes by helically winding up a thermoplastic, preferably strip-shaped plastic profile ( 2 ) onto a winding core ( 1 ) in an overlapping manner, where a plasticizing aggregate supplies the plastic profile ( 2 ) via a profile nozzle ( 4 ), it is provided that the plasticizing aggregate is a kneading means ( 3 ) supplying a thermoplastic plastic mixed with reinforcing fibers to the winding core ( 1 ) via the profile nozzle ( 4 ).

An extrusion apparatus having a barrel (3) and a rotatable threaded screw (1) coaxially positioned therein is disclosed. The apparatus includes an upstream inlet section having an opening (13) therein for receiving material to be processed by the apparatus, a compression section (2) downstream of the inlet section, and a mixing or plasticizing section (7/8) downstream of the compression section. The interior surface of the barrel is provided with an undercut (12) therein which intercommunicates the feed opening with the compression section and has a portion thereof which extends downstream in the compression section about the interior surface of the barrel with a continuously decreasing cross-sectional area. The undercut may be formed in a cylindrical insert (9), carried within the barrel and, in an alternate embodiment, a second undercut cylindrical insert positioned about the first insert and rotatable relative thereto may be employed to vary the cross-sectional area of the undercut.

The invention relates to a plastic pipe (1) comprising at least one connecting point (2) for connection to another plastic pipe (3) or to another connecting piece, wherein the connecting point (2) has a sealing area. A reinforcement (5) is applied to the connecting point (2) in the sealing area and substantially or completely prevents the plastic of the connecting point (2) from creeping in the sealing area. The invention also relates to a method and devices for producing a corresponding plastic pipe.

A device for preparing and ejecting polymeric cement made from at least two pre-packaged components comprises a tubular vessel including a first axial end wall having a closed outlet, and a second axial end wall having an aperture. A first starting component of the polymeric cement is present inside said tubular vessel near the first axial end wall. A hollow shaft extends through said aperture of the second axial end wall. A piston element comprises a closed container filled with a second starting component of the polymeric cement. The piston element is selectively lockable to the shaft. The container has a bore and is slidingly engaged upon said shaft. An agitator element is secured to one end of the shaft. Furthermore opening means for providing an opening in the closed container are provided. The hollow shaft is provided with a gas permeable filter means.

A device that may be applied in particular to shutters and similar and that will allow, by means of the rotation of the sole handle (28), the opening of the shutter, the orientation of movable blades (6) and the determination of the blocking in a plurality of different positions by moving rods (18) with the possibility of different interposition of metal plates (55, 56, 63, 66, 66 min ). In variants, i.e. the case of shutters with fix blades (6), the same handle (28) may be used for the sole opening of the shutter, while in the case of fix shutters with movable blades (6) said handle (28) may be used for the sole orientation of blades.