Abstract

The present invention relates to a power screwdriver (1) with a drive part (3) having a drive device and with a transmission part (7), wherein the transmission part (7) transmits a rotary movement of the drive device to an output shaft (9), and wherein the drive part (3) is connected to the transmission part (7) via a pivot joint (5), via which the drive part (3) is rotatable with respect to the transmission part (7), wherein the pivot joint (5) has a fixing device (19), via which the pivot joint (5) is blockable, and the pivot joint (5) has an input shaft journal (29) and an output shaft (31). The fixing device (19) has an actuating element (45), which connects the input shaft journal (29) to the output shaft (31), wherein, when a threshold value of a counter torque applied to the output shaft (31) is exceeded, the actuating element (45) actuates the fixing device (19) for blocking.

IPC Classes  ?

• B25F 5/02 - Construction of casings, bodies or handles
• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/147 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers

Abstract

ab) is attained.

IPC Classes  ?

• B25B 23/147 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• G01P 3/44 - Devices characterised by the use of electric or magnetic means for measuring angular speed

Abstract

The present invention relates to a power screwdriver (1) having a drive part (3) that has a drive device, and having a transmission part (7). The transmission part (7) has a torque converter and an output shaft (9) which transmit a rotational movement of the drive device. The drive part (3) is connected to the transmission part (7) via a rotational joint (5) by means of which the drive part (3) can rotate relative to the transmission part (7). The rotational joint (5) has a fixing device (19) by means of which the rotational joint (5) can be locked.

IPC Classes  ?

• B25B 13/48 - SpannersWrenches for special purposes
• B25F 5/02 - Construction of casings, bodies or handles
• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers

Abstract

The invention relates to a securing system (100) for power screwdrivers (101), for immobilizing a power screwdriver (101), which is placed on a threaded bolt (200) with a nut, in the axial direction of the threaded nut (200), said securing system comprising a securing device (1). Said securing device (1) comprises a locking element (3) which engages with the threaded section of the threaded bolt (200) projecting over the nut, the locking element (3) being movable in the radial direction relative to the threaded bolt (3) to engage with the threaded section of the threaded bolt (3).

IPC Classes  ?

• B25B 13/06 - SpannersWrenches with rigid jaws of socket type
• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/08 - Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers
• B25B 23/10 - Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means

Abstract

The screw tensioning device comprises a support tube (12), a cylinder member (15) and a piston section (17). The piston section serves for moving a tensioning bolt (20) screwed onto the thread of a threaded bolt (31). Provided according to the invention is a depth measuring device (35), which presents an externally visible indication of the screw-in depth (ET) of the threaded bolt (31). This ensures that, when the threaded bolt (31) undergoes extension under strain, there is a threaded engagement with the tensioning bolt (20) along a sufficiently long distance. This avoids the hazard that the screw tensioning device might break off from the threaded bolt.

IPC Classes  ?

• B25B 17/00 - Hand-driven gear-operated wrenches or screwdrivers
• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners

Abstract

A method for rotating a rotatable part using a hydraulic piston-cylinder drive operated by a hydraulic pressure source and having at least one piston and a ratchet, wherein a torque is applied to the rotatable part during a loading stroke and the piston is moved into a starting position via a return stroke. The loading stroke ends when an end position of the piston is reached and subsequently the return stroke is started, wherein the end position is a position of the piston before the piston abuts against an end stop.

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/145 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
• F15B 15/06 - Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non-rectilinear movement

Abstract

Disclosed is a method for controlling a screwdriver (1) that has an electromotor (7), the electromotor (7) having a clear ratio of speed (n) to torque (M) at a defined RMS voltage (Ueff soll), involving the following method step: - defining an RMS voltage (Ueff soll) for operating the electromotor (7), - defining a cut-off speed (nab) that corresponds to a pre-defined cut-off torque (Msoll) at the pre-defined RMS voltage (Ueff soll), - operating the screwdriver (1) under load with the pre-defined RMS voltage (Ueff soll), - during operation of the screwdriver: - determining the speed (n), - shutting down the electromotor (7) when the cut-off speed (nab) is attained.

IPC Classes  ?

• G05D 17/02 - Control of torqueControl of mechanical power characterised by the use of electric means
• B25B 23/142 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
• B25B 23/147 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers

Abstract

In the case of a power screwdriver (1) having a drive part (5) containing a drive cylinder, having an output part (7), wherein the output part has an output shaft (9) mounted in a housing (3), said output shaft (9) being rotated at intervals by the drive cylinder, and having a supporting part (11) arranged on the housing (3), said supporting part (11) being placeable against an abutment of a screwing location, provision is made for the housing (3) to have a holding system (15) for fixing the power screwdriver (1) at the screwing location, wherein the holding system (15) has at least one magnetic clamp (17, 17a, 17b) which cooperates with the screwing location and prevents the power screwdriver (1) from rotating away from the abutment.

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers

Abstract

In a method for rotating a rotatable part using a hydraulic piston cylinder drive operated by a hydraulic pressure source and having at least one piston and a ratchet, wherein a torque is applied to the rotatable part during a loading stroke and the piston is moved into a starting position via a return stroke, it is provided that the loading stroke ends when an end position of the piston is reached and subsequently the return stroke is started, wherein the end position is a position of the piston before the piston butts against an end stop.

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/145 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers

Abstract

The pressure supply unit has a pressure generating aggregate (10), which generates a supply pressure (PL) for the intermittent operation of a power screwdriver (11). So as to allow also a tensioning cylinder unit (33) to be operated alternatively to the power screwdriver (11), which requires higher pressure, a pressure intensifier (30) is provided which is included in a separate module (31) and generates high pressure (PH) from the supply pressure (PL). The reversal of the pressure intensifier (30) for carrying out strokes is achieved by the same stroke switch valve (20) which otherwise performs the reversal of the power screwdriver (11).

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose

Abstract

max).

IPC Classes  ?

• B23P 11/00 - Connecting or disconnecting metal parts or objects by metal-working techniques, not otherwise provided for
• B23P 21/00 - Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control

Abstract

A hydraulic aggregate comprises a container, a reservoir for hydraulic oil, and a pump driven by a motor arranged in the reservoir. The motor is a pneumatic motor. An electric control unit for controlling a main valve is mounted on the container. The main valve causes a reversal of the stroke direction of the hydraulic connections. The division into pneumatics and low power electronics leads to an explosion-proof embodiment of low weight and little technical complexity.

IPC Classes  ?

• B25B 23/145 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers

Abstract

The screw tensioning device has a supporting tube (12), a cylinder part (15) and a piston part (17).  The piston part serves for moving a tensioning bolt (20), which is screwed onto the thread of a threaded bolt (31).  Provided according to the invention is a depth measuring device (35), which gives an externally visible indication of the screwed-in depth (ET) of the threaded bolt (31).  This ensures that, when the threaded bolt (31) undergoes extension under strain, there is sufficiently long threaded engagement with the tensioning bolt (20).  This avoids hazardous breaking off of the screw tensioning device from the threaded bolt.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners

Abstract

The pressure supply unit has a pressure generating assembly (10), which generates a supply pressure (PL) for the intermittent operation of a power screwdriver (11). So as to allow a tensioning cylinder unit (33) to be operated alternatively to the power screwdriver (11), which requires higher pressure, a pressure intensifier (30) is provided which is included in a separate module (31) and generates high pressure (PH) from the supply pressure (PL). The reversal of the pressure intensifier (30) for carrying out strokes is achieved by the same stroke switch valve (20) which otherwise performs the reversal of the power screwdriver (11).

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 29/02 - Bolt tensioners
• F15B 3/00 - Intensifiers or fluid-pressure converters, e.g. pressure exchangersConveying pressure from one fluid system to another, without contact between the fluids

Abstract

The screwdriver has a drive part (11), from which a transmission part (12) projects in the axial direction. The drive part (11) is connected to a first handle (20) and a second handle (30). Both handles contain switching units (23, 33), in order to be able to turn on the drive of the screwdriver. The transmission part (12) has a support base (14) for support against a fixed buttress. The transmission part (12) can be rotated relative to the drive part (11) with the support base (14). When the bit (13) is placed on a rotating screw, the transmission part can rotate about its longitudinal axis and slowly pivot the support base (14) at the same time, until the support base is incident on the fixed buttress.

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers

Abstract

The invention relates to a hydraulic group comprising a reservoir (28) for oil, in which a multiple piston pump (60) is arranged. The individual pumps (61) are cyclically driven by an eccentric ring (29). In order to ensure a permanent immersion of the individual pumps in the reservoir (28), an auxiliary reservoir (47) providing oil for refilling the reservoir (28) is arranged above the reservoir. The auxiliary reservoir (47) is connected to an additional tank (45) by means of a connection line (48).

IPC Classes  ?

• F01B 1/06 - Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement
• F16D 31/02 - Fluid couplings or clutches with pumping sets of the volumetric type, i.e. in the case of liquid passing a predetermined volume per revolution using pumps with pistons or plungers working in cylinders
• F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric

Abstract

The invention relates to a method for joining components by means of tensioning bolts. According to said method, the pressure is linearly increased over time when the tensioning bolt is hydraulically tensioned by means of a tensioning device. When a target value (Pmax) is reached, the volume is blocked so that no more hydraulic oil is supplied. The pressure decreases when the components show a setting behavior during a holding time (tH). Pumping is resumed when a lower threshold value (Pi) is reached, resulting in a pressure increase up to the target value (Pmax). The invention prevents a setting process of the components from preventing that the projected pretension of the tensioning bolt is reached.

IPC Classes  ?

• B25B 29/02 - Bolt tensioners

Abstract

The invention relates to an hydraulic aggregate comprising a reservoir (11) for hydraulic oil in a container (10). A pump (15) driven by a motor (18) is arranged in the reservoir (11). The motor (18) is a pneumatic motor. An electric control device (30) for controlling a main valve (23) is mounted on the container (10). The main valve causes the inversion of the stroke direction of the hydraulic connections (13, 14). The division into pneumatics and low power electronics leads to an explosion-proof embodiment of low weight and little technical complexity.

IPC Classes  ?

• F04B 9/12 - Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
• F04B 23/02 - Pumping installations or systems having reservoirs
• B25B 23/145 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers

Abstract

A hydraulic aggregate for supplying a hydraulic cylinder in consecutive load lifts (LHl, LH2, LH3, LH4) is monitored for its working load in order to determine the state of the aggregate automatically. For this purpose, the time interval of the pressure is determined for each load lift. The pressure and duration are processed into a characteristic number which indicates the wear, making it possible to diagnose the state of the hydraulic aggregate at any time.

IPC Classes  ?

• F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere
• F04B 51/00 - Testing machines, pumps, or pumping installations

Abstract

The invention relates to a hydraulic power screwdriver comprising a ratchet lever (16) driven by a hydraulic cylinder. According to the invention, said power screwdriver is provided with a friction brake (20) which operates continuously between the housing (10) and the output shaft (14). In this way, reversed rotations of the output shaft following the individual working strokes are avoided.

IPC Classes  ?

• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose