1. A single-spindle or multi-spindle deep boring machine having a tool change device characterised in that the device (7) is formed by cylindrically arranged receiving tubes (8), wherein along a part of the length of the receiving tubes (8) the cross-section thereof is removed over an angle of somewhat more than 180 degrees, in such a way that for the purposes of receiving a deep boring tool (3, 3') perpendicularly to the axis of the receiving tube (8), wherein the inside diameter thereof is substantially equal to the diameter of the deep boring tool (3, 3'), an open half-shell is formed, from which the deep boring tool can be pushed into the remaining part in the axial direction of the receiving tube (8).

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).

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 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 concerns a device (1) for manipulating tools comprising two parts, said device being of the type consisting of a frame and at least one tray forming a table, designed to receive the mold. The invention is characterized in that it comprises two horizontally arranged trays (6, 9-7, 8) one of which is arranged sliding on the frame to be mobile in translation relative to the other tray, from a close position to a remote position and inversely, so as to enable the tool to be manually opened and closed.

The system has a cross arm (1) with a plate (12), and a motorized system to plunge a sampling device (5) into soil or material to be sampled. A lower end of a vertical rod (50) of the device crosses a drilling in the plate. The drilling of the plate (12) is located in an axis of a ring (31) of a support device (3) and in a drilling of a plate (32) of the support device. An independent claim is also included for a method to implement a system for using a device that takes samples in humid soil or a material of granular or powdery composition.

A power tool (10) is described which has several modes of operation, such as drilling and screw driving modes. A clutch is provided with various settings for adjusting the torque at which the clutch interrupts power to a spindle (18). Furthermore, a two speed gearbox (16) is provided for adjusting the speed of the spindle (18). All of these variables are controllable from a single adjustment member or collar (26) thereby reducing necessary decisions needed to be made by an operator for a particular job in hand. For instance, when an operator wants the tool (10) to operate in a screw driving mode, the gearbox (16) is automatically set to drive the spindle (18) at a low speed with the clutch being operable to interrupt drive when a torque force applied to the spindle (18) exceeds a threshold value. Furthermore, if the tool (10) is required to operate in a drilling mode, the gearbox (16) is automatically switched to drive the spindle (18) at a higher speed and the clutch is automatically rendered inoperable.

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 invention relates to a method for straightening a metal strip (1) which is guided in the direction of transportation (R) through a straightening machine (2) and is straightened. In the straightening device (2), the metal strip (1) is impinged upon by a straightening force (F) which is applied by a plurality of straightening rollers (3) in the direction (N) which is perpendicular to the surface of the metal strip (1). According to the invention, prior to the metal strip (1) entering into the straightening machine (2), the thickness (d) of the metal strip (1) is determined and the position (a) of the straightening rollers (3) in the direction (N) which is perpendicular to the surface of the metal strip (1) is taken into account according to the determined thickness (d).

The invention relates to a method for straightening a metal strip (1) which is guided in the direction of transportation (R) through a straightening machine (2) and is straightened. In the straightening device (2), the metal strip (1) is impinged upon by a straightening force (F) which is applied by a plurality of straightening rollers (3) in the direction (N) which is perpendicular to the surface of the metal strip (1). According to the invention, prior to the metal strip (1) entering into the straightening machine (2), the thickness (d) of the metal strip (1) is determined and the position (a) of the straightening rollers (3) in the direction (N) which is perpendicular to the surface of the metal strip (1) is taken into account according to the determined thickness (d).