Abstract

The invention relates to a device for screwing and unscrewing bolts and screws by means of a motor-driven screwdriving tool, which is preferably used in the track region of railroad facilities. The invention is based on the object of developing a device which makes it possible to screw and unscrew screws, nuts and bolts reliably and effectively, preferably in the context of railroad use, wherein the appliance is intended to have a low weight and a high output over long periods of use, can be operated with one hand, is specifically pre-oriented to the various applications and has a modular construction. This is achieved according to the invention in that the device has a central rib (1) which serves as a receptacle for all of the attachments and fittings to be installed in a modular manner.

IPC Classes  ?

• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers
• B25B 21/00 - Portable power-driven screw or nut setting or loosening toolsAttachments for drilling apparatus serving the same purpose
• B25B 23/14 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
• B25B 23/18 - Devices for illuminating the head of the screw or the nut
• B25F 3/00 - Associations of tools for different working operations with one portable power-drive meansAdapters therefor
• B23P 19/06 - Screw or nut setting or loosening machines
• E01B 29/28 - Fixing or removing detachable fastening means or accessories thereofPre-assembling track components by detachable fastening means the fastening means being of screw-and-nut typeApparatus therefor, adapted to additionally drilling holes

Abstract

A method for producing a toothing on an in particular round workpiece, wherein the teeth are produced by a shaping method using a tool which moves along a path which is controlled by a lifting cam and in the case of which an exchange movement that runs substantially in the radial direction of the workpiece follows a downward movement which runs in the axial direction of the workpiece and serves to produce the tooth flanks, wherein the exchange movement is superimposed with a downward movement such that a curved path is produced during the exchange, is characterized in that the relative rake angle γrel of the tool (200) does not fall below a minimum rake angle γmin which corresponds to the rake angle γ of the tool (200), said rake angle γ being reduced by the angle δ between the longitudinal axis of the workpiece and the direction vector of the tool movement.

IPC Classes  ?

• B23F 5/12 - Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting
• B23F 5/16 - Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting the tool having a shape similar to that of a spur wheel or part thereof

Abstract

A power screwdriver overload prevention means (100), which is arranged between an input drive part (110) and an output drive part (102, 121) and which interrupts the transmission of torque between the input drive part (110) and the output drive part (102, 121) when a threshold torque is exceeded, is characterized in that the input drive part (110) has at least one ring of balls (130) that is arranged in a rotationally fixed manner in the input drive part, in that the output drive part (102, 121) has at least one ring of balls (140; 141, 142) that is arranged in a rotationally fixed manner in the output drive part (102, 121), and in that the ring of balls (130) that is arranged in the input drive part (110) is spring-preloaded via the ring of balls (140; 141, 142) arranged in the output drive part (102, 121) such that the balls (130) of the input drive part (110) are located in each case between two balls (140; 141, 142) of the output drive part (102, 121) and thus transmit a torque, and such that, when the threshold torque is exceeded, the balls (130) of the input drive part (110) roll over the balls (140; 141, 142) of the output drive part (102, 121) and thus interrupt the transmission of torque.

IPC Classes  ?

• B25B 23/14 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
• B23P 19/06 - Screw or nut setting or loosening machines
• F16D 7/02 - Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
• F16D 7/08 - Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type with intermediate balls or rollers moving axially between engagement and disengagement

Abstract

The invention relates to a device for producing precise tightening torque for screw connections characterised by the combination of a torque multiplier (100) and a torque wrench (200) which is adapted to said torque multiplier and calibrated therewith. The invention also relates to a method for calibrating said type of device.

IPC Classes  ?

• B25B 13/46 - SpannersWrenches of the ratchet type, for providing a free return stroke of the handle
• B25B 17/02 - Hand-driven gear-operated wrenches or screwdrivers providing for torque amplification
• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers
• B25B 23/142 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers

Abstract

The invention relates to a circuit arrangement for operating a hydraulic torque wrench or similar, comprising a piston-cylinder unit (18) that can be controlled at a predetermined pressure by a pump (11). Said arrangement is characterised in that the piston-cylinder unit (18) can be controlled by the pump (11) by means of a proportional valve (12) which acts both as a reversing unit between the forward and return travel and as a pressure control valve.

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

A housing (100) for a hydraulic unit is characterized by a housing wall (101) which is closed on all sides and in which at least one inlet opening (110) and at least one fan (121), which can be operated independently of the hydraulic unit (400), are arranged.

IPC Classes  ?

• F15B 1/26 - Supply reservoir or sump assemblies

Abstract

The invention relates to a mobile control device (10) for power wrenches, comprising at least one display unit (11) and at least one input element (12a, 12b, 13a, 13b, 13c). Said control device (10) is characterized by a mechanism (14) for receiving a contactless mobile data carrier (31) and a data carrier transceiver (33) which establishes a data carrier connection (34) to exchange data with a contactless mobile data carrier (31) that is placed in the receiving mechanism (14). The invention further relates to uses of said mobile control device (10) for remote controlling differently designed power wrenches (40, 50, 60) and/or exchanging data with such a power wrench (40, 50, 60) or at least recording data of such a power wrench (40, 50, 60). The disclosed mobile control device (10) for power wrenches is particularly suitable for use in harsh environmental conditions.

IPC Classes  ?

• B25B 23/00 - Details of, or accessories for, spanners, wrenches, screwdrivers

Abstract

The invention relates to a power screwdriver (10) comprising a motor (12) as the drive, a desired torque default element (52) and an actual torque determination element (46), a torque gradient determination element (48) and a motor control (40) which controls the motor (12) depending on the torque gradient (dmd_lst/dt). The invention is characterized by a torque threshold determination element (50) which provides a torque threshold value (Md_Lim, Md_Lim1, Md_Lim2) that depends on the torque gradient (dmd_lst/dt) and lies below the desired torque value (Md_Soll). If the actual torque value (md_Ist) exceeds the torque threshold value (Md_Lim, Md_Lim1, Md_Lim2), a motor control (40) presets a speed reduction for the motor (12) or already completely switches off the motor (12). The power screwdriver (10) according to the invention avoids torque overshoots and yet allows the desired torque value (Md_Soll) to be exactly reached in the shortest time possible.

IPC Classes  ?

• B25B 23/147 - Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
• B23P 19/06 - Screw or nut setting or loosening machines

Abstract

The invention relates to a power screwdriver (10) comprising a motor (12) and a control circuit (22) which switches the motor (12) off by means of a switch-off signal (s_Stop) when it reaches a preset desired torque value (Md_Soll), and a supporting arm (18) which absorbs energy during screwing. The invention is characterized by a voltage limiting circuit (46) that limits the motor voltage (u_Mot) occurring on the motor (12) when the energy stored in the supporting arm (18) of the motor (12), which is driven as the generator and rotates counter to the direction of drive, is dissipated, to a predetermined limiting voltage (u_Lim). Said limiting voltage (u_Lim) is fixed in such a manner that the motor (12) is capable of rotating without counter-torque counter to the direction of drive when operated in the generator mode and that yet no inadmissible overvoltages occur.

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
• H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Goods & Services

(1) Tools namely machine tools for use in automotive industry, metalworking industry and textile industry, hand-held tools other than hand-operated for use in automotive industry, metalworking industry and textile industry, namely torque wrenches, battery operated wrenches, hydraulic wrenches, electric wrenches, pneumatic wrenches, torque multipliers, side power wrenches, gate valve wrenches; accessories for machine tools and hand-held tools other than hand-operated for use in automotive industry, metalworking industry and textile industry, namely accessories for torque wrenches, battery operated wrenches, hydraulic wrenches, electric wrenches, pneumatic wrenches, torque multipliers, side power wrenches, gate valve wrenches, impact sockets, hexagon socket supports, hexagon socket inserts, hydraulic aggregates; Hand-operated tools for use in automotive industry, metalworking industry and textile industry, counter wrenches, dynamometric keys and wrenches; Torque testing instruments namely for use in automotive industry, metalworking industry and textile industry, testing machines namely for use in automotive industry, metalworking industry and textile industry, test benches for use in automotive industry, metalworking industry and textile industry, namely for measuring electrical and mechanical parameters