Abstract: A hydraulic pressing unit includes a hydraulic pump, supply and hydraulic chambers, moving and stationary parts, a restoring spring, and a return valve provided within or attached to a housing. The moving part is displaced from a starting position into a pressing position as a result of filling the hydraulic chamber with a hydraulic medium from the supply chamber by using the hydraulic pump. The return valve is automatically displaced into an open position as a result of a hydraulic pressure corresponding to the pressing position, and the restoring spring moves the moving part. A piston acts on the flow of the hydraulic medium and lowers the pressure such that the return valve is displaced into the closed position.

Abstract: A motorized manually operated pressing tool, in particular a crimping tool, with a fixed holding part, in which at least one pressing jaw is pivotably mounted about a pivot axis. The pressing jaw forms a working area and an impingement region extending in the longitudinal direction of the pressing jaw. In order to carry out a pressing operation the impingement region can be acted upon with an impinging part that is movable relative to the impingement region. The impinging part is movable in the longitudinal direction of the impingement region by exertion of manual force and by a motor.

Abstract: A chain-like pressing device and a method of using same for press joining a tubular or hose-shaped workpiece with a fitting and/or a ferrule is provided. The device at least two pressing members interacting over the circumference in the radial direction. The pressing members can move relative to each other in the circumferential direction at their interacting surfaces that transmit the pressing force. The interacting surfaces enclose an angle of less than 180° therebetween. The pressing device includes a plurality of pressing members forming a first linkage for enclosing the workpiece, at least one of the pressing members transmits pressing force only by pressure or tension application through a further first pressing member.

Abstract: A method of using a hydraulically driven pressing device for pressing a fitting on a tube is provided. The pressing device includes a piston and a cylinder for acting on pressing jaws. A piston shaft is connected to rollers. The pressing device can be used to carry out pressing operations requiring different levels of pressing power, by using an adjustable stop which is provided in the direction of displacement of the piston in order to achieve different end positions for the piston during the piston return stroke.

Abstract: A method for the pressing of a press fitting, with a tube inserted into the press fitting, by way of a pressing tool, wherein the press fitting has an encircling bead in which an O-sealing ring is placed, wherein the tube ends within the press fitting and a first pressing is carried out within the bead, wherein, furthermore, a further pressing is carried out on the tube-insert side of the press fitting at a distance from the bead, the further pressing leading to press fitting and tube obtaining a conicity which prevents them being pulled off and runs in the same direction. Furthermore, the invention relates to a pressing tool suitable for carrying out the method.

Abstract: A chain-like pressing device and a method of using same for press-joining a tubular or hose-shaped workpiece with a fitting and/or a ferrule is provided. The device at least two pressing members interacting over the circumference in the radial direction. The pressing members can move relative to each other in the circumferential direction at their interacting surfaces that transmit the pressing force. The interacting surfaces enclose an angle of less than 180° therebetween. The pressing device includes a plurality of pressing members forming a first linkage for enclosing the workpiece, at least one of the pressing members transmits pressing force only by pressure or tension application through a further first pressing member.

Abstract: The invention relates to a jaw pair for punching out holes or recesses, preferably in sheet metal parts, the jaw pair being connectable to a device (23) to be operated preferably hydraulically and being designed, for example, as a pivoting jaw pair, wherein a punch (8) is formed on one jaw and a punching opening (6) is formed on the other jaw. To provide an advantageous jaw pair for punching out holes or recesses, preferably in sheet metal parts, it is proposed that a stripper part (10) which is situated outside of an outer contour of the punch (8) in the punching direction is formed in the jaw having the punch (8) and is movable in relation to the punch (8).

Abstract: The invention relates to a method for milling a cutout in a piece of material, the cutout having peripheral edge portions in a corner region that meet one another at an angle, and the cutout being formed using a milling cutter which during operation occupies an enveloping surface, for example a cylindrical surface, having a lateral face and an end face, the corner region being initially formed in a first orientation of the milling cutter which preferably corresponds to a longitudinal axis of the cutout, by use of the portion of the milling cutter that generates the lateral face of the, for example cylindrical, surface.

Abstract: A cable lug and a method of use is provided. The cable lug has a receiving tube section for a cable, a flat piece-connecting section that is molded on and is provided with a bore, and a nut which is captively and preferably rotatably mounted on the flat piece-connecting section. The nut does not penetrate the flat piece-connecting section while being mounted by a shaped mounting material section of the flat piece-connecting section, which extends into an undercut in the nut. The mounting material section is in the undercut with an axial clearance. The mounting material section is rooted in a lowered in a step-type manner in the flat piece-connecting section. The lowered area is rotationally symmetrical and is provided with a conical section which opens outward and vertically and encompasses at least one conical area.

Abstract: A method of using a hydraulically driven pressing device for pressing a fitting on a tube is provided. The pressing device includes a piston and a cylinder for acting on pressing jaws. A piston shaft is connected to rollers. The pressing device can be used to carry out pressing operations requiring different levels of pressing power, by using an adjustable stop which is provided in the direction of displacement of the piston in order to achieve different end positions for the piston during the piston return stroke.

Abstract: A chain-like pressing device and a method of using same for press joining a tubular or hose-shaped workpiece with a fitting and/or a ferrule is provided. The device at least two pressing members interacting over the circumference in the radial direction. The pressing members can move relative to each other in the circumferential direction at their interacting surfaces that transmit the pressing force. The interacting surfaces enclose an angle of less than 180° therebetween. The pressing device includes a plurality of pressing members forming a first linkage for enclosing the workpiece, at least one of the pressing members transmits pressing force only by pressure or tension application through a further first pressing member.

Abstract: A hand tool that is preferably hydraulically actuable includes a working head and a body unit that remains in place with respect to the head, drive elements for driving the working head being provided in the body unit, for example a hydraulic pump and a hydraulic supply, a switching movement also allowing a powered movement of one or more working parts of the working head to be triggered and the working head being swivelably connected to the body unit in a rotary connection region. In order to configure and develop a hand tool so that safe working is assured by virtue of unambiguous and clear handling, by swivelling of the body unit relative to the working head about an axis of rotation provided in the region of the rotary connection of the working head to the body unit, switching over can be carried out with regard to the powered movement of the working part.

Abstract: A pair of cutting jaws are provided for a hydraulic or electric pressing tool. Each jaw is formed in the manner of a lever, with a driving portion and a working portion, which extend in opposite directions from a pivot axis. The working portion is reduced in its thickness by half or more in comparison with the driving portion.

Abstract: A method of using a hydraulically driven pressing device for pressing a fitting on a tube is provided. The pressing device includes a piston and a cylinder for acting on pressing jaws. A piston shaft is connected to rollers. The pressing device can be used to carry out pressing operations requiring different levels of pressing power, by using an adjustable stop which is provided in the direction of displacement of the piston in order to achieve different end positions for the piston during the piston return stroke.

Abstract: The invention relates in first instance to a nut having a first part (11) which has a first through opening (Of), and having a second part (12) which has a opening (O2) having an opening contour, the parts (11, 12) being connected so as to be rotatable about a rotational axis (A) which passes through the openings (O1, O2), and the openings (O1, O2) being aligned with one another, in addition, the first opening (O1) on its inner face having a profile which extends in the peripheral direction and which is interrupted in the peripheral direction. In order to provide a nut which is quickly mountable on a threaded bolt, and which has a simple design that allows greater security against the nut coming off the threaded bolt, it is proposed that the opening contour of the second opening is non-circular. The invention further relates to a combination of a bolt (4) having a cross-sectional area with a nut (10).