WO2008128523A2 - Kraftschrauber - Google Patents
Kraftschrauber Download PDFInfo
- Publication number
- WO2008128523A2 WO2008128523A2 PCT/DE2008/000671 DE2008000671W WO2008128523A2 WO 2008128523 A2 WO2008128523 A2 WO 2008128523A2 DE 2008000671 W DE2008000671 W DE 2008000671W WO 2008128523 A2 WO2008128523 A2 WO 2008128523A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- torque
- electric motor
- power wrench
- voltage
- gradient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
Definitions
- the invention relates to a power wrench according to the preamble of the independent claim.
- a mains voltage operated screwdriver which provides a predetermined torque setpoint.
- the torque applied by the screwdriver is detected indirectly on the basis of the current flowing through the electric motor. Due to the mains connection, the starting point is an operating voltage of the electric motor, which is always the same and constant. If the torque setpoint has not yet been reached, the screwdriver turns at the maximum possible speed, which depends on the torque setpoint to be applied. Due to the inertia of the rotating parts of the screwdriver, such as electric motor and in particular gear, the screw is still rotated depending on the caster after reaching the torque setpoint.
- the problem occurring in DE 23 26 027 A1 due to the further rotation of the screwdriver when reaching the torque setpoint is taken up by the DE 103 41 975 A1.
- Described is an electronic torque limiting device for a used for example in a battery-powered screwdriver electric motor.
- the starting point is an electronic torque limitation, in which the current flowing through the electric motor is used as a measure of the torque.
- Such a procedure is referred to as inaccurate, because in particular at high speeds after switching off the electric motor by the kinetic energy of the rotating masses can occur with the result that a screw is tightened with a higher torque than the predetermined torque setpoint.
- a torque setpoint can be set which is in a maximum value of
- Electric motor current is converted.
- AC power supply is supplied. It is based on the knowledge that the electric motor provides a maximum and specific torque under load at standstill, this torque depends on the provided voltage or the load current according to the respective motor characteristic.
- the tightening torque setpoint is achieved at a low speed or even when the wrench is stopped, thus avoiding overshoot of the torque setpoint by an overrun.
- a battery-powered small screwdriver which contains a switching element which short-circuits the electric motor off.
- the switching element is actuated by a depth stop.
- the abrupt deceleration of the electric motor reduces overshoot.
- short-circuiting of the electric motor is possible only at comparatively low torques to be delivered, for example, 100 Nm and low-power electric motors, even in low-power electric motors in the case of short-circuiting a high-speed rotating electric motor with a significant short-circuit current and the related electromagnetic interference must be expected.
- the short-circuit current loads both a collector of a DC motor realized as an electric motor and the used
- DE 201 13 184 U1 and, for example, DE 19647813 A1 specify electric motor-driven screwdrivers designed as hand tool machines, which each have a support arm for providing a counter torque when tightening or loosening screw connections.
- Such screwdrivers are referred to as power wrenches, because the torque provided can amount to, for example, 10,000 Nm, which could not be applied without the support arm of an operator of the power wrench. With increasing torque during the screwing deforms the torque provided can amount to, for example, 10,000 Nm, which could not be applied without the support arm of an operator of the power wrench. With increasing torque during the screwing deforms the torque provided can amount to, for example, 10,000 Nm, which could not be applied without the support arm of an operator of the power wrench. With increasing torque during the screwing deforms the
- Support arm elastic, whereby the support arm absorbs energy.
- the support arm clamps the screwdriver on the screw connection.
- the support arm takes not only the energy occurring during the screwing, but also after switching off the power wrench still in the rotating masses such as the
- DE 196 20 782 A1 discloses a method for producing a screw connection, in which the temporal torque curve is detected as a gradient. A distinction is made between a first and second torque increase, wherein the first torque increase a thread cutting operation and the second torque increase the tightening of
- the invention has for its object to provide a power Schauber, in particular a battery-powered power wrench, which allows the achievement of a predetermined torque setpoint for a screw without the risk of torque overshoot.
- the power wrench according to the invention has an electric motor as drive, a
- Torque setpoint specification a torque-actual value determination, a torque gradient determination and an electric motor drive, which controls the electric motor in dependence on the torque gradient.
- a torque threshold setting that provides a torque threshold that depends on the torque gradient and that is below the torque setpoint.
- the electric motor drive gives the electric motor a speed reduction or already completely shuts off the electric motor.
- the power wrench according to the invention makes it possible, on the basis of the torque gradient determination, to fall short of hard and soft Screwdriving.
- the torque threshold setting may selectively set the torque threshold below the torque setpoint such that torque overshoot may occur due to the speed reduction or the complete shutdown of the electric motor Exceeding the torque threshold can be avoided.
- An embodiment provides that the electric motor control the electric motor at a torque actual value, which is below the torque threshold, the maximum possible speed of the electric motor pretends. Accordingly, the maximum possible power is made available to the electric motor, whereby the maximum possible under the given load conditions
- the torque threshold setting sets the difference at a larger torque gradient to a higher value than a smaller torque gradient, so that torque overshoot is avoided in both a hard and soft tightening case.
- Setpoints for determining the torque threshold are stored. Alternatively, it may be provided that the torque threshold setting extrapolated the torque threshold based on the detected torque gradient, torque feedback, and set torque setpoint.
- Another embodiment provides a motor current detection, which the
- Motor current detected as a measure of the torque actual value can be realized, for example, as a low-impedance shunt, which is cheaper to implement compared to an electromagnetic motor current detection.
- Another embodiment provides a data carrier in which characteristic values of the screw connection are stored and / or which is provided for the storage of recorded data of the screw connection to be produced.
- the data carrier contains at least the predetermined torque setpoint. At least the torque actually achieved can be stored.
- the data carrier may also contain parameters such as calibration data of the power screwdriver or be provided for storing such characteristics.
- the data carrier can be assigned to the power screwdriver. According to another aspect
- the power wrench means for signal transmission to a rauber arranged outside of the power ram on.
- a further development provides for a voltage limiter circuit which switches the motor voltage occurring at the electric motor to a predetermined one
- Limiting voltage limited is preferably set at least to the rated operating voltage of the electric motor, so that the electric motor can contribute to the reduction of an optionally stored in a support arm of the power wrench towards the end of the screwing energy by operating the electric motor in the generator mode, without the
- the voltage limiter circuit preferably includes a bipolar limiter diode and / or a varistor.
- the power wrench according to the invention provides as a power source for the electric motor before a lithium-based accumulator due to its comparatively high energy density.
- a battery voltage drop compensation circuit is preferably provided, which compensates the influence of a sinking supply voltage on the achievement of the set torque setpoint, which occurs in particular when the torque actual value is obtained from the motor current.
- Akkunapsabfall compensation circuit with decreasing supply voltage either increases the set torque setpoint or reduces the determined torque actual value. As a result, an intervention in the power section of the electric motor is avoided.
- FIG. 1 shows a sketch of a power wrench according to the invention
- FIG. 2 shows a block diagram of a drive circuit of the power wrench according to the invention
- FIGS. 4a and 4b show different embodiments of a voltage limiter circuit.
- FIG. 1 shows a sketch of a power wrench 10, which includes an electric motor 12 as a drive, which drives a socket 16 via a gear 14.
- Power wrench 10 includes a support arm 18 which provides a counter moment during the screwing operation.
- a battery-operated power wrench 10 contains a battery part 20 in which an accumulator 22 is accommodated. The commissioning of the power wrench 10 takes place with a switch 24. For controlling the electric motor
- a drive circuit 26 is provided, to which a data carrier 28 and a transceiver 30 are assigned.
- a DC motor 12 is assumed, which is preferably driven by a pulse width modulated signal which determines the average operating voltage of the electric motor 12.
- FIG. 2 shows an electric motor drive 40 which provides a pulse width modulated signal s_PWM which either completely opens or completely closes a switching element 42, for example a MOS field effect transistor, wherein the period duration and / or the pulse duration can be variable.
- a pulse width modulated signal s_PWM which either completely opens or completely closes a switching element 42, for example a MOS field effect transistor, wherein the period duration and / or the pulse duration can be variable.
- a motor current i_Mot flows as a function of the pulse duty factor of the pulse-width-modulated signal s_PWM, depending on from the supply voltage u_Batt and in dependence on the load of the electric motor 12.
- the motor current i_Mot is used as a measure of the torque applied by the electric motor 12 and thus as a measure of the provided on the socket 16
- the motor current i_Mot is detected with a motor current detection 44, which is implemented as a low-resistance resistor or shunt of, for example, 0.01 ohms.
- the voltage drop u_Sens which occurs as a measure of the motor current i_Mot at the shunt 44 is amplified in a torque actual value determination 46, which contains, for example, an OpAmp connected as a differential amplifier, and provided as a measure of the actual torque value mdjst.
- a signal smoothing device not shown in detail is provided, which frees the torque actual value md_lst at least from high-frequency interference signals.
- the torque actual value mdjst is provided to the electric motor drive 40, a torque gradient determination 48 and a torque threshold determination 50.
- the torque gradient determination 48 determines the gradient dmd_lst / dt of the torque actual value md_lst by determining at least one time differential differential. Preferably, the differential quotient is approximated and by the difference quotient.
- the torque gradient determination 48 provides the torque gradient dmd_lst / dt of the torque threshold setting 50, which is based on the torque gradient dmd_lst / dt, the actual torque value mdjst, that of a torque setpoint specification 52 provided torque setpoint Md-SoII and a torque minimum value Md_Min a torque threshold MdJJm determines which of the electric motor drive 40 is available.
- FIG. 3 shows a first screw connection SF1, which corresponds to a hard screw connection, in which a comparatively rapid change of the actual torque value md_lst occurs.
- FIG. 3 shows a second screwdriver SF2 which corresponds to a soft screwdriving case in which a comparatively slow change of the actual torque value md_lst occurs.
- the torque gradient determination 48 determines the torque gradient dmd_lst / dt, which can be approximated, for example, by at least one difference quotient. In the embodiment shown in FIG 3, it is assumed that the
- Torque gradient determination 48 after exceeding the torque minimum value Md_Min on the basis of a time interval dti determined at least one difference quotient.
- the time interval dti is to be set in such a way that the expected fastest possible torque increase and the lowest possible setpoint torque setpoint Md_Soll ensure that the torque threshold setting 50 can determine and provide a torque threshold value Md_l_im1, Md_Lim2.
- the torque minimum value Md_Min is set, for example, to a torque actual value mdjst which is slightly above the expected value
- the torque threshold setting 50 sets the first torque threshold Md_l_im1 and for the second screwdriver SF2 the second torque threshold Md_Lim2 fixed.
- Threshold values Md_Lim1, Md_Lim2 are each below the torque setpoint Md SoII.
- the first torque threshold MdJJmI is a first one Difference d1 below the torque setpoint Md-SoII and the second torque threshold Md_Lim2 is a second difference d2 below the torque setpoint Md_Soll.
- the torque threshold setting 50 may set the threshold Md_l_im1,
- Md_Lim2 based on stored tables.
- functional relationships between said input variables are stored in the torque threshold setting 50, so that the torque threshold values Md_Lim1, Md_Lim2 can be extrapolated from the current actual torque value mdjst.
- the relationship can be based on a straight-line equation, so that the expected torque curve can be completely specified by the slope and a point of the straight line.
- the torque threshold values Md_Lim1, Md_Lim2 or the functional relationships required for determining the threshold values Md_Lim1, Md_Lim2 are preferably determined experimentally and stored in the torque threshold setting 50.
- Torque threshold Md_Lim1 or the first difference d1 are adapted to a hard screw case, which was detected on the basis of the determined torque gradient dmd_lst / dt.
- the first difference d1 is comparatively large.
- the second torque threshold Md_Lim2 will be reached at a fourth time ti4.
- the second torque threshold Md_Lim2 or the second difference d2 are adapted to a soft screw case, which was detected on the basis of the determined torque gradient dmd_lst / dt.
- a first comparator 54 included in the electric motor drive 40 compares the torque threshold MdJJm, MdJJmI, Md_Lim2 with the actual torque value mdjst, and provides a control signal s_Mot depending on the result of the comparison.
- the control signal s_Mot ensures that the pulse width modulated signal s_PWM the electric motor 12 with a lower
- the speed reduction or the complete shutdown after reaching the torque threshold MdJJm, MdJJmI, Md_Lim2 substantially prevents an overshoot of the torque actual value mdjst, which would cause the screw connection with a higher torque than the torque setpoint Md- SoII would screwed.
- the overshoot is caused by the existing in the electric motor 12 and in particular in the transmission 14 kinetic energy towards the end of the screwing.
- the hard screw SF1 critical, because in a relatively short time ti the torque setpoint Md_Soll is reached.
- the torque actual value mdjst increases until a second time ti2 almost without reduction of
- Torque gradient dmd Jst / dt occurs.
- the speed reduction initiated by the control signal s_Mot and predetermined by the pulse-width-modulated signal Sj 3 WM or the complete switching off of the electric motor 12 thus does not take effect until the second time ti 2.
- the torque setpoint Md_Soll is reached at a third time ti3 with a reduced torque gradient dmdjst / dt. If the electric motor 12 has not already been completely switched off when the first torque threshold value Md_l_im1 is exceeded, the electric motor 12 is switched off at the latest at the third time ti3. This shutdown is caused by a stop signal s_Stop, which provides a arranged in the electric motor drive 40 second comparator 56 in response to the comparison result between the torque setpoint Md_Soll and the torque actual value mdjst.
- the second torque threshold Md_Lim2 may be much closer to the torque setpoint Md-SoII, corresponding to a smaller difference d2. Also in this case, after reaching the second torque threshold Md_Lim2, the speed reduction of the
- Electric motor 12 causes or the electric motor 12 is already completely switched off. Due to the resulting reduction of the torque gradient dmd_lst / dt after exceeding the second torque threshold value Md_Lim2, an overshoot is also prevented in the case of the soft screw connection SF2, so that the screw connection coincides exactly with the torque
- Setpoint Md-SoII is attracted, which is reached at a fifth time ti5.
- the battery 22 which is preferably realized as a lithium-based accumulator, which is characterized by a high energy density.
- a lithium-based accumulator which is characterized by a high energy density.
- the battery 22 provides the supply voltage u_Batt.
- a battery voltage drop compensation circuit 60 which compensates the influence of a sinking supply voltage u_Batt on reaching the set torque setpoint Md-SoII.
- the supply voltage u_Batt could be directly stabilized and kept constant, but power semiconductor devices would be required, which are relatively expensive on the one hand and on the other hand because of the high expected currents to 100A, for example, are too voluminous to be accommodated in the power Schreiber 10 can.
- the battery voltage drop compensation circuit 60 preferably intervenes with a compensation signal s_Batt_Komp in the torque setpoint input 52 or in the actual torque value determination 46, wherein with decreasing supply voltage u_Batt either the torque setpoint Md-SoII increases or the actual torque value mdjst is reduced.
- the battery voltage drop compensation circuit 60 may include, for example, a reference voltage source with which the supply voltage u_Batt is compared. As the difference between the reference voltage and the supply voltage u Batt decreases during the discharging process of the battery 22, the compensation signal s_Batt_ Komp is constantly increased, wherein the increase in a virtual reduction of the motor current i_Mot corresponds to equalize the actually lower motor current i_Mot with decreasing supply voltage u_Batt in the signal evaluation ,
- the support arm 18 provides the required counter torque to the torque transmitted by the socket 16 to the screw connection.
- the support arm 18 is in preparation for the To fix screwing on a suitable support.
- the energy stored in the support arm 18 has after switching off the power Schaubers 10 when reaching the set torque setpoint Md-SoII the maximum value.
- the socket 16 and thus the entire power wrench 10 is clamped on the screw.
- the stored energy in the support arm 18 causes the electric motor 12, starting from the socket 16, is driven backwards via the gear 14, wherein the electric motor 12 begins to rotate in the opposite direction to the drive direction.
- the electric motor 12 is therefore stored during the degradation of the support arm 18
- the electric motor 12 should be able to rotate freely without applying a counter-torque, which would complicate and extend the discharge process.
- the electric motor 12 should therefore not be short-circuited or low-resistance bridged in this operating condition, which would occur even at a low generator voltage, a high motor current i_Mot, corresponding to a high counter-torque.
- a high motor current i_Mot corresponding to a high counter-torque. It should be noted here that in generator mode the motor voltage u_Mot reverses due to the other direction of rotation and the motor current i_Mot therefore flows in the opposite direction, provided that the current path is available.
- Volts were detected voltage peaks to over 200 volts with a pulse duration of several 100 ns. Such high-energy pulses can for Destruction of components of the drive circuit 26, in particular to destroy the switching element 42 lead.
- the voltage limiter circuit 70 is provided which detects the motor voltage u_Mot occurring at the electric motor 12 during the degradation of the motor
- Support arm 18 stored energy as a generator operated against the drive direction rotating electric motor 12 limited to a predetermined limiting voltage u_Lim.
- the voltage limiter circuit 70 is not comparable to a freewheel which essentially short circuits only the electric motor 12.
- the voltage limiter circuit 70 allows the targeted specification of the limiting voltage u_l_im, so that the electric motor 12 during generator operation in the destruction of the energy stored in the support arm 18 at least until reaching the limiting voltage u_l_im no
- the voltage limiter circuit 70 can take over the function of a freewheel, wherein during the freewheel, in which the direction of the motor current i_Mot does not turn around, the limiting voltage u_Lim occurs as a motor voltage u_Mot.
- a not shown in detail switched freewheel can be provided which of the pulse width modulated
- Signal s_PWM is controlled.
- the voltage limiter circuit 70 can be realized in different ways.
- the voltage limiter circuit 70 includes a bipolar voltage limiter diode 72, which is also referred to as TVS (Transient Voltage Suppressor).
- the voltage limiter diode 72 includes two Zener diodes integrated in one single component.
- the voltage limiter circuit 70 contains a varistor 74.
- diodes 72 enable a very fast response to voltage pulses
- a varistor 74 can receive and derive a higher energy, at least in the short term. Depending on the requirements, therefore, a combination of diodes 72 and a varistor 74 may be provided.
- the limiting voltage u_Lim is initially set to a value at which in the normal drive mode of the electric motor 12 no limitation of
- Motor voltage u_Mot can occur.
- the limiting voltage u_Lim is thus set to a value of at least 28 volts in a 28 volt electric motor 12. Since the motor voltage u_Mot reverses in generator operation of the electric motor 12, the voltage limiter circuit 70 must provide the limiting voltage u_Lim, in particular for the motor voltage u_Mot, with reversed polarity, since the risk of overvoltage exists in generator operation in particular.
- the positive potential of the motor voltage u_Mot at the switching element 42 occurs during generator operation of the electric motor 12, while the negative potential is applied to the battery 22.
- a limiting voltage u_Lim is given, which corresponds at least to the amount of the nominal operating voltage of the electric motor 12. According to another embodiment, at least the in
- a protective low voltage in this sense should be defined by the fact that on an electrical device, in this case the power wrench 10, live parts that can be touched, the
- the protective low voltage must not exceed. If this could be the case, Special measures must be taken to protect against contact.
- the protective low voltage is for example at 42 volts.
- Kraftsch raubers 10 provides a data carrier 80 which contains data for the screw, such as at least the torque setpoint Md-SoII, and / or for receiving data, such as the actually achieved torque actual value mdjst, is prepared, which are stored at least at the end of the screwing process.
- the data carrier 80 may further contain calibration data of the power converter 10 and / or be prepared for storing parameters of the power wrench 10.
- the data carrier 80 is realized as a mobile data carrier, for example as a low-cost RFID.
- a transmitting / receiving device 82 which is designed for receiving and / or transmitting data relating to screwing and / or characteristics of the power wrench 10.
- the transmitting / receiving device 82 is preferably designed to cooperate with a data carrier, not shown in detail, for example, a mobile data carrier, which may correspond to the data carrier 80. Unless it is at this
- Disk is an already mentioned RFID, the transmitting / receiving device 82 to a high-frequency transmitter and / or high-frequency receiver, wherein the transmission / reception frequency is tuned to the transmission / reception frequency of the data carrier.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/451,013 US20100116519A1 (en) | 2007-04-23 | 2008-04-23 | Power screwdriver |
| BRPI0811037A BRPI0811037A8 (pt) | 2007-04-23 | 2008-04-23 | parafusadeira elétrica |
| CN2008800215449A CN101765483B (zh) | 2007-04-23 | 2008-04-23 | 电动螺丝刀 |
| EP08757966A EP2146822B1 (de) | 2007-04-23 | 2008-04-23 | Kraftschrauber |
| CA2684786A CA2684786C (en) | 2007-04-23 | 2008-04-23 | Power screwdriver |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007019409A DE102007019409B3 (de) | 2007-04-23 | 2007-04-23 | Kraftschrauber |
| DE102007019409.0 | 2007-04-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2008128523A2 true WO2008128523A2 (de) | 2008-10-30 |
| WO2008128523A3 WO2008128523A3 (de) | 2009-01-08 |
Family
ID=39744869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2008/000671 Ceased WO2008128523A2 (de) | 2007-04-23 | 2008-04-23 | Kraftschrauber |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US20100116519A1 (de) |
| EP (1) | EP2146822B1 (de) |
| CN (1) | CN101765483B (de) |
| AR (1) | AR066256A1 (de) |
| BR (1) | BRPI0811037A8 (de) |
| CA (1) | CA2684786C (de) |
| CL (1) | CL2008001169A1 (de) |
| DE (1) | DE102007019409B3 (de) |
| RU (1) | RU2459695C2 (de) |
| TW (1) | TWI492824B (de) |
| WO (1) | WO2008128523A2 (de) |
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| FR2972665A1 (fr) * | 2011-03-18 | 2012-09-21 | Renault Georges Ets | Procede pour adapter automatiquement la vitesse de vissage d’un outil de vissage pour atteindre un couple de consigne par freinage anticipe. |
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| EP2572831A3 (de) * | 2011-09-20 | 2015-10-21 | Makita Corporation | Elektrisches Werkzeug |
| EP3021767A4 (de) * | 2013-07-19 | 2017-07-05 | Pro-Dex Inc. | Drehmomentbegrenzende schraubendreher |
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| FR2972665A1 (fr) * | 2011-03-18 | 2012-09-21 | Renault Georges Ets | Procede pour adapter automatiquement la vitesse de vissage d’un outil de vissage pour atteindre un couple de consigne par freinage anticipe. |
| EP2572831A3 (de) * | 2011-09-20 | 2015-10-21 | Makita Corporation | Elektrisches Werkzeug |
| EP3021767A4 (de) * | 2013-07-19 | 2017-07-05 | Pro-Dex Inc. | Drehmomentbegrenzende schraubendreher |
| US10206731B2 (en) | 2013-07-19 | 2019-02-19 | Pro-Dex, Inc. | Torque-limiting screwdrivers |
| WO2015027999A1 (de) * | 2013-08-27 | 2015-03-05 | Lösomat Schraubtechnik Neef Gmbh | Verfahren zum verschrauben einer federklemme einer schienenbefestigung |
| US10383674B2 (en) | 2016-06-07 | 2019-08-20 | Pro-Dex, Inc. | Torque-limiting screwdriver devices, systems, and methods |
| US11071575B2 (en) | 2016-06-07 | 2021-07-27 | Pro-Dex, Inc. | Torque-limiting screwdriver devices, systems, and methods |
| US11890144B2 (en) | 2016-06-07 | 2024-02-06 | Pro-Dex, Inc. | Torque-limiting screwdriver devices, systems, and methods |
| US12376936B2 (en) | 2016-06-07 | 2025-08-05 | Pro-Dex, Inc. | Torque-limiting screwdriver devices, systems, and methods |
| US11090128B2 (en) | 2018-08-20 | 2021-08-17 | Pro-Dex, Inc. | Torque-limiting devices, systems, and methods |
| US11882991B2 (en) | 2018-08-20 | 2024-01-30 | Pro-Dex, Inc. | Torque-limiting devices, systems, and methods |
| US12295794B2 (en) | 2018-08-20 | 2025-05-13 | Pro-Dex, Inc. | Torque-limiting devices, systems, and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2684786C (en) | 2015-04-07 |
| US20100116519A1 (en) | 2010-05-13 |
| CL2008001169A1 (es) | 2008-10-03 |
| BRPI0811037A8 (pt) | 2019-01-15 |
| DE102007019409B3 (de) | 2008-11-13 |
| RU2009142992A (ru) | 2011-05-27 |
| CN101765483B (zh) | 2013-09-18 |
| TW200846142A (en) | 2008-12-01 |
| CN101765483A (zh) | 2010-06-30 |
| RU2459695C2 (ru) | 2012-08-27 |
| BRPI0811037A2 (pt) | 2014-12-09 |
| EP2146822B1 (de) | 2012-08-01 |
| EP2146822A2 (de) | 2010-01-27 |
| TWI492824B (zh) | 2015-07-21 |
| AR066256A1 (es) | 2009-08-05 |
| CA2684786A1 (en) | 2008-10-30 |
| WO2008128523A3 (de) | 2009-01-08 |
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