A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft (13) is coupled, having a threaded end which is adapted for connection to a complementary threaded end on the drill string, and wherein a clamping/lifting means known as an elevator (38) is suspended below the rotary device by two hanger struts (37). The shaft (13) connected to the rotary device is telescopic. Outside the shaft a lifting means (24, 25, 40) is provided for the lower part (21) of the telescopic shaft. The two hanger struts (37) which carry the elevator (38) for one end of the pipe are axially movable in relation to the telescopic shaft (13) by means of a sliding holder (35) known as a link hanger. The link hanger (35) is axially movable by means of hydraulic cylinders (42,43).The lifting means for the lower part of the telescopic shaft consists of hydraulic cylinders .(24, 25) which are constructed as a unit together with the hydraulic cylinders (42, 43), the cylinders (24, 25) constituting piston rods for the hydraulic cylinders (42,43).

The tooth (10) includes a pivot bearing (12) which pivotally supports a pivot pin on a cutting wheel hub. A cutting tooth support (20) and a steering arm (30) extend from the pivot bearing, to opposite directions. The pivot bearing, the cutting tooth support, and the steering arm are designed as a one-piece support. Independent claims are also included for the following: (A) a cutting wheel; and (B) a trench cutter.

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 device has a measuring tape (4) attached by clamping to a concave surface (3) of a carrier body (1). The extent of the concave surface is defined by detent surfaces (6,7) on each end of the measuring tape. At least one of the detent surfaces is adjustable using an adjusting device (9), so that the spacing of the detent surfaces can be matched to the length of the measuring tape.

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.

1. A bucket excavator (1) having an arm system (6) carrying a work tool (21) preferably formed as a ditcher (20) which has a dipper arm (30) fixed to a pivotable beam (12) and which can be folded generally in a vertical plane to a transport position and is adjustable from this position to an extended position, by means of a pivot drive connected to the beam (12), which engages with a dipper arm connection (15) on the free end of the dipper arm (30), characterised in that a pair (31) of alternately loadable traction cylinders (32, 33) is provided as the pivot drive, of which one serves for extending the dipper arm (30) and by means of a flexible traction means (49) is connected to the free end of the dipper arm (17), whilst the other traction cylinder (32) serves for folding the arm system (6) and is connected by a flexible traction means (38) between the connections (15, 19) of the dipper arm (30) and the work tool (21) to the dipper arm (30), and that both traction means (38, 49) on the beam (6) are guided between the dipper arm connection (15) and the beam connection, in which a rocker arm (53) fixed to the dipper arm (30) in the extended position of the dipper arm (30) turns the traction means (38) of the traction cylinders (32) serving for folding of the arm system (6) and in the folded position of the arm system (6) turns the traction means (49) of the traction cylinder (33) serving for the extension around the axis (16) of the dipper arm connection (15) by means of a curve (55).

The device (1) comprises a base (2), carrying a servo motor (3) and attached to the frame of a machine center. A carriage (6) with a vertical shaft (8) on top can be moved on two telescopically arranged rails (4,5) joined horizontally to the base (2). The tool holding elements (16,17) are positioned at the upper end of the shaft (8) and can be fixed with a locking unit (18). A control plate (12) is located at the second rail (5) acting in combination with a guiding roll (10) in order to facilitate a swivel motion of the tool carrier (15).

The invention relates to a penetrator (1, 11) made of heavy metal, such as, for instance, tungsten heavy metal or depleted uranium, for driving-cage projectiles which have the penetrator led by the driving cage in the gun barrel. The driving cage (6, 12) detaches itself from the penetrator after the launch. The penetrator (1, 11) shows lower strength and higher ductility in the middle portion (d) of its length than in its head portion (c) and, in its tail portion, it shows higher strength and lower ductility than in its middle portion (d) and lower strength and higher ductility than in its head portion (c). This shall decrease the risk of fracture when striking an armour. The varying strength values in the head portion (c), in the middle portion (d) and in the tail portion (e) are obtained by cold-hammering under varying degrees of deformation, by sintering from various powder mixtures or by varying partial heat-treatment in the various portions (head portion c, middle portion d and tail portion e), and these measures can be applied individually or in combination. At least one pilot core (14, 15) which is only loosely connected to the penetrator (1, 11) can also be fitted to the head portion.

An injection molding tool (10) for producing disc shaped moldings comprises primary and secondary plates (11,12) arranged opposite each other, which can move relative to each other to open and close the mould, and a mould ring (20). The latter surrounds the primary plate concentrically, closes off the injection mould (25) at the outer edge, and can move relative to the primary plate. An injection molding tool (10) for producing disc shaped moldings, especially in the form of information carriers such as CD's and/or DVD's, comprises primary and secondary plates (11,12) arranged opposite each other, which can move relative to each other to open and close the mould, and a mould ring (20). The latter surrounds the primary plate concentrically, closes off the injection mould (25) at the outer edge, and can move relative to the primary plate. A tempering arrangement (26) for the mould ring is located in the ring, and tempering can be carried out electrically or by use of a tempering medium. The tempering arrangement is in the form of a channel, and a tempering medium can be supplied to it via a connection. A second arrangement (28) is used to blow the finished molding over its peripheral region after the mould has been opened.

The invention relates to a color chamber doctor blade 1 , which has following characteristic features: two doctor blade knives 2 that can be set up in a roof-like fashion against a roller 6 from which two doctor blade knives 2 can be fixed on the doctor blade chamber body 5 by means of a clamping plate 3 whereby the clamping plate 3 is in active connection with long-stretch fasteners 4 in the axial direction (z) of the roller 6, which are arranged essentially parallel to the clamping plate 3 and from which the force required for fixing at least one doctor blade knife 2 is applied. Inventive is that the resultant of the force exercised by the fasteners 4 points to the doctor blade chamber body 5.