Abstract: A handheld pressing device for connecting two work pieces, in particular a pipe and a press fitting by means of a pressing process, has a pressing tool with multiple pressing jaws. The pressing tool is connected to a converter driven by an electric motor. The electric motor and the converter are partly surrounded by a housing. The pressing device has at least one data detecting element, at least one data detecting element being a camera. Furthermore, the camera is used as a data detecting element for documenting pressing processes in a method.

Abstract: A hydraulic pressing tool which is particularly suitable for pressing pipe fittings, and which has a hydraulic pump connected to an electric motor is provided. With the aid of the hydraulic pump, hydraulic fluid is pumped from a tank into a piston chamber to operate the hydraulic piston. The pressure prevailing in the piston chamber is determined by a pressure sensor. When a pressure limit is reached, a solenoid valve is opened by the control device such that the hydraulic fluid flows back out of the piston chamber, through the channels, and into a reservoir.

Abstract: In a method for producing a pipe connection by press fitting, the following steps are carried out to increase the burst pressure: placing a press fitting onto two pipe ends to be connected to one another; compressing the press fitting against one of the two pipe ends by plastically deforming the press fitting and the pipe end to form a bulge and a first indentation; once again compressing the press fitting against the same pipe end at a distance (a) from the first compression point by plastically deforming the press fitting and the pipe end, thereby forming a second indentation; and connecting the press fitting to the second pipe end.

Abstract: In the case of a method for automatically controlling an electrohydraulic pressing tool, in particular for producing pipe connections, to actuate the pressing tool a hydraulic piston is moved, in that fluid is pumped into a hydraulic cylinder by a hydraulic pump driven by an electric motor. When a limiting pressure in the hydraulic cylinder is reached, a pressure relief valve opens, and so the hydraulic fluid can flow into a reservoir. With the aid of a control device, a current drop at the motor is detected when the valve opens. The electric motor is switched off when the current falls by a predetermined value (?I) and/or decreases over a predetermined time period (?t) after reaching a limiting current.

Abstract: A handheld pressing tool, which is suitable in particular for crimping press fittings and/or cable lugs, has at least two pressing elements which can move in relation to one another. These can be closed by a hydraulically operated piston element. To this end, the piston element is connected to at least one actuation element for moving at least one of the pressing elements. When the piston element is being returned to a short-stroke starting position, a brake element acts on the piston element and/or the actuation element.

Abstract: An electro-hydraulic pressing device, which is particularly suitable for producing pipe joints by means of press fittings, has a pressure piston, which acts on pressing jaws. The pressure piston divides a pressure piston chamber into a pressure chamber and a rear chamber. A hydraulic pump for feeding hydraulic fluid from a reservoir is connected to the pressure chamber. A balance piston is arranged in the piston in addition to an overpressure valve. Up until a switch-off pressure is reached, i.e. throughout the pressing process, the balance piston closes a connection opening and a return flow channel.

Abstract: A hand-operated pressing tool, which is suitable in particular for producing pipe connections, for pressing cable lugs, and/or for actuating cutting jaws, comprises a drive device arranged in a housing. The drive device is connected to an energy source. Furthermore, a start button, a display device, and a diagnostic connector are provided. The start button as well as the display device are arranged under a transparent housing cover. Preferably, the housing cover can be opened in order to reach the diagnostic connector.

Abstract: In a method for producing a pipe connection by press fitting, the following steps are carried out to increase the burst pressure: placing a press fitting onto two pipe ends to be connected to one another; compressing the press fitting against one of the two pipe ends by plastically deforming the press fitting and the pipe end to form a bulge and a first indentation; once again compressing the press fitting against the same pipe end at a distance (a) from the first compression point by plastically deforming the press fitting and the pipe end, thereby forming a second indentation; and connecting the press fitting to the second pipe end.

Abstract: An electro-hydraulic pressing device, which is particularly suitable for producing pipe joints by means of press fittings, has a pressure piston, which acts on pressing jaws. The pressure piston divides a pressure piston chamber into a pressure chamber and a rear chamber. A hydraulic pump for feeding hydraulic fluid from a reservoir is connected to the pressure chamber. A balance piston is arranged in the piston in addition to an overpressure valve. Up until a switch-off pressure is reached, i.e. throughout the pressing process, the balance piston closes a connection opening and a return flow channel.

Abstract: A press tool, such as a press sling for pressing in particular tubular workpieces, comprises a plurality of articulated press elements connected to one another in the form of a chain. The press tool is open between two end press elements for forming a closing site between two end press elements. In order to unlatch the press tool from a closed position in which the closing site is substantially closed, a handling element is provided according to the disclosure. Said tool alternatively also serves for releasing a press jaw mounted on a press jaw carrier.

Abstract: In the case of a method for automatically controlling an electrohydraulic pressing tool, in particular for producing pipe connections, to actuate the pressing tool a hydraulic piston is moved, in that fluid is pumped into a hydraulic cylinder by a hydraulic pump driven by an electric motor. When a limiting pressure in the hydraulic cylinder is reached, a pressure relief valve opens, and so the hydraulic fluid can flow into a reservoir. With the aid of a control device, a current drop at the motor is detected when the valve opens. The electric motor is switched off when the current falls by a predetermined value (?I) and/or decreases over a predetermined time period (?t) after reaching a limiting current.

Abstract: A hand-operated pressing tool, which is suitable in particular for producing pipe connections, for pressing cable lugs, and/or for actuating cutting jaws, comprises a drive device arranged in a housing. The drive device is connected to an energy source. Furthermore, a start button, a display device, and a diagnostic connector are provided. The start button as well as the display device are arranged under a transparent housing cover. Preferably, the housing cover can be opened in order to reach the diagnostic connector.

Abstract: A hydraulic pressing tool which is particularly suitable for pressing pipe fittings, and which has a hydraulic pump connected to an electric motor. With the aid of the hydraulic pump, hydraulic fluid is pumped from a tank into a piston chamber to operate the hydraulic piston. The pressure prevailing in the piston chamber is determined by means of a pressure sensor. When a pressure limit is reached, a solenoid valve is opened by the control device such that the hydraulic fluid flows back out of the piston chamber, through the channels, and into a reservoir.

Abstract: The invention relates to a process for connecting a pipe (2, 31) in the region of its pipe end to a pipe coupling (1), comprising at least one support sleeve (3) with engagement elements (5, 65, 67, 124), in which context the pipe (2, 31) and the support sleeve (3) are first pushed into one another, the pipe (2, 31) then being pressure deformed, thereby bringing about a form-fitting connection with the engagement elements (5, 65, 67, 125) and bringing about a sealing relationship with sealing surfaces (7, 66, 68, 122), mutually adjoining each other in axial direction. The process is characterised in that an axial force, bearing on the sealing surfaces (7, 66, 68, 122) is applied to the pipe (2, 31) by way of a spring device (20, 52) deriving support from the pipe coupling (1) and that a facility for expansion is provided for the pipe (2, 31) on the side of the engagement elements (5, 65, 67, 125) oriented towards the pipe.

Abstract: In a method for joining workpieces, in particular press fittings (24) to a pipe (23), the pressing device (1) is placed with its at least two pressing jaws (21, 22) in the open position against the joining point of the workpieces 23, 24), and the pressing jaws (21, 22) are then moved with respect to one another by means of a jaw drive (7, 50), while the workpieces (23, 24) deform plastically, into a terminal pressed position in which, at the latest, the application of power to the press jaws (21, 22) ends. According to the invention, the power of the jaw drive (7, 50) is controlled in such a way that, at least toward the completion of pressing, the pressing jaws (21, 22) have less kinetic energy than without a power controller. The invention further concerns a pressing unit (1) for carrying out said method.

Abstract: A pressing device includes a pressing tool, an electric motor for driving the tool, and a rechargeable battery for supplying energy to the electric motor. A control device has a voltage comparison element that performs a voltage comparison between the battery voltage and a limit voltage. The control device generates an attention signal and/or limits activation of the electric motor if the voltage comparison element indicates that the battery voltage is equal to or less than the limit voltage. The control device includes an interval element with at least one storable interval. A load element acts upon the battery so that it generates a varying voltage curve. The interval element is activated when the load element is on and voltage comparison is made during a predetermined interval.

Abstract: A coupling device for joining pipe ends has at least one pressing sleeve which can be slipped on a pipe end and pressed together with the pipe end. The pressing sleeve is elastically designed in the area of its inner surface pressed on the pipe end so that an expansion of the pipe end caused by temperature variations can be absorbed by elastic shear deformation of the elastic area, without causing the pipe end to slide in the pressing sleeve.

Abstract: A pressing device for joining workpieces has a pressing tool and a motorized drive for actuation of the pressing tool over a pressing distance, as well as a control device which has a drive control device for influencing the drive. The drive control device has a malfunction detection device which has an actual value sensor which is suitable for detecting, as the actual value, a physical magnitude which is correlated with the pressing resistance. At least one limit value profile for the actual value is retained in the malfunction detection device, and it has a comparison device which, during a pressing, checks whether the particular actual value lies on the permissible or impermissible side of the pertinent limit value profile. The malfunction detection device comprises a signal device and/or a shutdown device for the drive, which are/is activated if the actual value lies on the impermissible side of the pertinent limit value.

Abstract: The invention concerns a pressing device (1) for joining workpieces, in particular press fittings to a pipe, having an electric drive (6) and a pressing tool (2) attached replaceably thereto, and is characterized in that control parameters for the drive (6) are stored on the pressing tool (2).

Abstract: A pressing device (1, 111), in particular for joining a pipe (23) with a press fitting (24), has at least two pressing jaws (17, 18, 21, 22, 122, 123, 124, 125, 126) and a drive (7) for moving the pressing jaws (17, 18, 21, 22, 122, 123, 124, 125, 126) or a part thereof relative to one another from an open position into a final pressed position, such that at least one sensor (36, 37, 38, 39, 40, 41, 42, 51, 151, 152) for sensing the final pressed position of the pressing jaws (17, 18, 21, 22, 122, 123, 124, 125, 126) is arranged in the region of the pressing jaws (17, 18, 21, 22, 122, 126), and such that an indicating device (43), which generates an externally perceptible indicating signal when the final pressed position is or is not reached, is associated with the sensor (36, 37, 38, 39, 40, 41, 42, 51, 151, 152).