EP3180166A1 - Optimized method for setting expansion anchors by means of a power tool - Google Patents
Optimized method for setting expansion anchors by means of a power toolInfo
- Publication number
- EP3180166A1 EP3180166A1 EP15757151.4A EP15757151A EP3180166A1 EP 3180166 A1 EP3180166 A1 EP 3180166A1 EP 15757151 A EP15757151 A EP 15757151A EP 3180166 A1 EP3180166 A1 EP 3180166A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- expansion anchor
- machine tool
- expansion
- speed
- anchor
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001419 dependent effect Effects 0.000 claims abstract description 6
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 230000007480 spreading Effects 0.000 claims description 20
- 230000035939 shock Effects 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 3
- 238000009527 percussion Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 210000000078 claw Anatomy 0.000 description 3
- 230000036316 preload Effects 0.000 description 2
- 238000010897 surface acoustic wave method Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
-
- 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
- B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers for impact wrenches or screwdrivers
-
- 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
- B25B31/00—Hand tools for applying fasteners
Definitions
- the present invention relates to a method for setting an expansion anchor by means of a machine tool, in particular a impact wrench. Moreover, the present invention relates to a machine tool, in particular an impact wrench, for carrying out this method, comprising an input device for detecting a type of expansion anchor or a tightening torque for the expansion anchor, a striking mechanism for generating and on the expansion anchor transferable rotary strikes, a device for detecting a rotation angle of an output shaft of the machine tool and a control device.
- Expansion anchors are inserted into a pre-drilled hole and then clamped by default in the hole by means of a torque wrench.
- the use of a torque wrench proves to be necessary because a user can not look at the expansion anchor inserted into the hole, whether it is properly braced, i. is set.
- a torque wrench proves to be necessary because a user can not look at the expansion anchor inserted into the hole, whether it is properly braced, i. is set.
- the manufacturers of the expansion anchor accordingly indicate an associated tightening torque which is to be set on the torque wrench for setting.
- a setting method for an expansion anchor and an impact wrench for setting a spreading anchor is disclosed, for example, in German Patent Application DE 10 201 1 005 079 A1.
- This prior art document describes a setting method for an expansion anchor by means of an impact wrench in which rotational impacts are repeatedly exerted on the expansion anchor. A repetition rate of the rotary impacts is set as a function of a predetermined torque for spreading an expansion sleeve of the expansion anchor.
- the impact wrench sets the application of rotational shocks when a detected average speed falls below a threshold of a nut of the expansion anchor.
- the loss of preload force is probably caused by the very high speed of the setting process.
- torque is usually applied at a plurality of intervals over a period of about 20 seconds.
- the return movement is carried out with the torque wrench, local stress peaks in the material (for example concrete) can already be reduced.
- the resulting loss of prestressing force is compensated again.
- a machine tool in particular an impact wrench
- a machine tool in particular an impact wrench
- Machine tool (20) generated first speed until a generated in the machine tool (20) and the expansion anchor (1) applied tightening torque corresponds to a predetermined threshold value;
- a machine tool in particular an impact wrench, is provided for carrying out this method, comprising an input device for detecting a type of an expansion anchor or a tightening torque for the expansion anchor, a hammer mechanism for generating and on the expansion anchor transferable rotary strikes, means for detecting a tightening torque the machine tool and a control device.
- the machine tool is characterized in that the control device is designed
- Fig. 1 an expansion anchor in a borehole
- FIG. 2 shows a machine tool according to the invention in the form of an impact wrench and an expansion anchor in a borehole.
- the expansion sleeve 3 circumferentially surrounds a cylindrical portion 4 of the tie rod 2.
- An outer diameter 5 of the cylindrical portion 4 is preferably slightly smaller than an inner diameter 6 of the expansion sleeve 3, whereby the pull rod 2 against the Aufspreizelement 3 is axially movable.
- the cylindrical section 4 merges into a conical section 7, which forms an expansion body 8 for spreading the expansion sleeve 3.
- the largest diameter of the conical section 7 is greater than the inner diameter 6 of the expansion sleeve 3 and preferably less than an outer diameter 9 of the expansion 3.
- a thread 10 is provided, via which a tensile force can be introduced.
- the thread 10 serves at the same time a fastening of loads.
- the expansion anchor 1 with the expansion body 8 is inserted into a borehole having a diameter slightly smaller than the outer diameter of the unexpanded expansion sleeve 3.
- a nut 11 is screwed onto the thread 10 and tightened until the pull rod 2 together with the spreader 8 is pulled into the expansion sleeve 3.
- the expansion sleeve 3 clamps firmly to a wall 12 of the borehole.
- the expansion anchor 1 is properly set when the expansion sleeve 3 is radially expanded by a certain amount. A user can recognize this when the nut 11 does not rotate at a specified tightening torque.
- expansion anchor for example, a bolt with a mating thread that engages the thread 10 of the tie rod 2.
- the user uses a screwing tool on the bolt and pulls in this way the pull rod 2 with the spreader 8 in the expansion sleeve. 3
- the exemplary expansion anchors 1 can be set by means of an adapted impact wrench 20.
- the impact wrench 20 is connected in a known manner with the expansion anchor 1 so that the producible in the impact wrench 20 tightening torque corresponding to the expansion anchor 20 and in particular to the nut 1 1 is transmitted.
- the impact wrench 20 has a percussion mechanism 21 which periodically generates rotary impacts in the direction of rotation A.
- a hammer (not shown) is supported on a drive shaft 23 by means of a helical link (not shown).
- a spring urges the hammer 22 along the output shaft 23 toward an anvil (not shown).
- the anvil is rigidly connected to an output shaft 27.
- the drive shaft 23 and the output shaft 27 are rotatable relative to each other.
- the hammer and the anvil are lengthwise the drive shaft 23 projecting (not shown) claws, via which the hammer can transmit torque to the anvil.
- An electric motor 29 drives the drive shaft 23 via a gear, not shown.
- One cycle of a rotary stroke has essentially the following phases.
- the claws of the hammer touch the anvil.
- the rotating drive shaft 23 pulls the hammer away from the anvil against the force of the spring spring because of the gate until the jaws are disengaged from the anvil 26.
- the hammer moves in the direction of the anvil and is thereby set by the scenery in a rotary motion.
- the claws finally strike tangentially on the anvil.
- An embodiment of the impact wrench 20 has an input device 30, by means of which a user can enter the special tightening torque of the expansion anchor 1.
- the input device 30 includes, for example, a button (not shown), a keyboard (not shown), a button (not shown), and / or a display element (not shown).
- an input device 30 may be provided, via which the user can set a type as well as the associated tightening torque for an expansion anchor.
- two buttons are provided for selecting a type or type of expansion anchor and a size of the expansion anchor.
- the selected type of expansion anchor and the associated tightening torque can be displayed, for example, in a designed as a display or multiple LEDs display element.
- a controller 35 reads the input tightening torque from the input device 30 and the detection device 33, respectively.
- the recognizer 33 may be realized in the form of a scanner, a scanner, an input panel, or the like.
- the control device 35 determines a first speed for the drive shaft 23 on the basis of the input tightening torque. For example, rotational speeds assigned to different tightening torques are stored in a memory device 36. After a user activates the electric motor 29 by means of a pushbutton (not shown), the control device 35 checks whether a rotational speed has previously been predetermined, for example by specifying the expansion anchor type or the tightening torque. The control device 35 can inhibit activation of the motor 29, for example, if no tightening torque was selected so far, but instead prompt the user for an input. The control device 35 controls the electric motor 29 such that the drive shaft 23 rotates at the predetermined first speed. The selected first rotational speed of the drive shaft 23 specifies the repetition rate of the rotational shocks.
- the impact wrench 20 starts to rotate the nut 11 with a maximum possible speed to him. After a period of time, which is preferably determined by the input type of the expansion anchor 1, the impact wrench lowers the speed to the predetermined speed in dependence on the tightening torque.
- the tightening torque is the tightening torque predetermined for the respective expansion anchor used.
- a device 39 for detecting a tightening torque of the machine tool 20 is arranged on the output shaft 27, a device 39 for detecting a tightening torque of the machine tool 20 is arranged.
- the means 39 for detecting a tightening torque of the machine tool 20 is realized by a torque transducer.
- the Drehmomentetzêt 39 serves to detect the tightening torque on the output shaft 27, which is generated by the machine tool 20 and in particular by the electric motor 29.
- the torque transducer 39 may include strain gauges and / or function according to the piezoelectric, magnetoelastic or optical principle. Alternatively or in addition, the torque transducer can also work with the SAW method (Surface Acoustic Wave method).
- SAW method Surface Acoustic Wave method
- the control device 35 compares the tightening torque detected by the torque transducer 39 with threshold values for the tightening torque stored in the memory device 36. If the tightening torque detected by the Drehmomentetzêt 39 reaches a predetermined threshold, this is an indicator that the expansion anchor can not be further rotated with the torque applied to him or with the torque acting on him set to the first speed wrench and is properly placed in the borehole. According to an embodiment not shown and not further described, a torque sensor is not necessarily provided, since the tightening torque for the expansion anchor with a corresponding device can be determined or estimated indirectly from the motor rotation angle.
- the control device 35 the electric motor so that a second speed for the drive shaft 23 is applied.
- the second speed is less than the first speed.
- the second or lower speed generates rotational shocks with a correspondingly lower tightening torque, which is exerted on the expansible anchor for a predetermined period of time t. In this way, a re-tensioning can be generated on the expansion anchor, whereby the setting effects can be compensated without the biasing force in the expansion anchor can be further increased.
- the setting process of the expansion anchor 1 is thereby optimized so that the expansion anchor 1 can be subjected to the highest possible tensile load in the borehole.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Joining Of Building Structures In Genera (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14180636.4A EP2985118A1 (en) | 2014-08-12 | 2014-08-12 | Optimised setting procedure for an expansible anchor |
PCT/EP2015/068420 WO2016023886A1 (en) | 2014-08-12 | 2015-08-11 | Optimized method for setting expansion anchors by means of a power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3180166A1 true EP3180166A1 (en) | 2017-06-21 |
EP3180166B1 EP3180166B1 (en) | 2018-06-20 |
Family
ID=51301170
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14180636.4A Withdrawn EP2985118A1 (en) | 2014-08-12 | 2014-08-12 | Optimised setting procedure for an expansible anchor |
EP15757151.4A Active EP3180166B1 (en) | 2014-08-12 | 2015-08-11 | Optimised setting procedure for an expansible anchor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14180636.4A Withdrawn EP2985118A1 (en) | 2014-08-12 | 2014-08-12 | Optimised setting procedure for an expansible anchor |
Country Status (5)
Country | Link |
---|---|
US (1) | US10589407B2 (en) |
EP (2) | EP2985118A1 (en) |
JP (1) | JP6552602B2 (en) |
CN (1) | CN106457533B (en) |
WO (1) | WO2016023886A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2985117A1 (en) * | 2014-08-12 | 2016-02-17 | HILTI Aktiengesellschaft | Optimised setting procedure for an expansible anchor |
US10646982B2 (en) * | 2015-12-17 | 2020-05-12 | Milwaukee Electric Tool Corporation | System and method for configuring a power tool with an impact mechanism |
EP3424643A1 (en) * | 2017-07-05 | 2019-01-09 | HILTI Aktiengesellschaft | Setting tool, set for a set tool system and set tool system |
EP3501740A1 (en) * | 2017-12-20 | 2019-06-26 | HILTI Aktiengesellschaft | Setting method for threaded connection by means of impact wrench |
EP3501742A1 (en) * | 2017-12-20 | 2019-06-26 | HILTI Aktiengesellschaft | Setting method for expansion dowell using impact wrench |
EP3501743A1 (en) * | 2017-12-20 | 2019-06-26 | HILTI Aktiengesellschaft | Setting method for expansion dowell using impact wrench |
US10962992B2 (en) | 2017-12-25 | 2021-03-30 | Industrial Technology Research Institute | Apparatus with two anchors |
TWI638153B (en) * | 2017-12-25 | 2018-10-11 | 財團法人工業技術研究院 | An apparatus with two anchors |
WO2019147621A1 (en) * | 2018-01-24 | 2019-08-01 | Milwaukee Electric Tool Corporation | Power tool including a machine learning block |
US20190232471A1 (en) * | 2018-02-01 | 2019-08-01 | Dino Paoli S.R.L. | Impact tool |
EP4003658A4 (en) | 2019-07-23 | 2023-07-26 | Milwaukee Electric Tool Corporation | Power tool including a machine learning block for controlling a seating of a fastener |
US20210240145A1 (en) * | 2020-01-30 | 2021-08-05 | Milwaukee Electric Tool Corporation | Automatic step bit detection |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10045985A1 (en) * | 2000-09-16 | 2002-03-28 | Hilti Ag | Electric drill has fixing bar code reader sets torque automatically |
JP4400303B2 (en) | 2004-05-12 | 2010-01-20 | パナソニック電工株式会社 | Impact rotary tool |
JP4339275B2 (en) * | 2005-05-12 | 2009-10-07 | 株式会社エスティック | Method and apparatus for controlling impact type screw fastening device |
DE102006017193A1 (en) * | 2006-04-12 | 2007-10-25 | Robert Bosch Gmbh | Method for tightening a screw connection and screwing tool |
DE102007019409B3 (en) * | 2007-04-23 | 2008-11-13 | Lösomat Schraubtechnik Neef Gmbh | power wrench |
JP4412377B2 (en) * | 2007-09-28 | 2010-02-10 | パナソニック電工株式会社 | Impact rotary tool |
JP2010247289A (en) | 2009-04-17 | 2010-11-04 | Dual Denshi Kogyo:Kk | Screw fastening method |
JP2012045665A (en) * | 2010-08-26 | 2012-03-08 | Toyota Motor Corp | Impact tightening tool |
DE102010062014B3 (en) | 2010-11-26 | 2012-05-10 | Hilti Aktiengesellschaft | Hand tool |
DE102011005079A1 (en) | 2011-03-04 | 2012-09-06 | Hilti Aktiengesellschaft | Setting method for an expansion anchor and impact wrench for setting a spreading anchor |
JP2013188812A (en) * | 2012-03-13 | 2013-09-26 | Hitachi Koki Co Ltd | Impact tool |
JP2014020120A (en) | 2012-07-19 | 2014-02-03 | Maeda Corp | Anchor bar, and slab joining structure employing the same |
-
2014
- 2014-08-12 EP EP14180636.4A patent/EP2985118A1/en not_active Withdrawn
-
2015
- 2015-08-11 WO PCT/EP2015/068420 patent/WO2016023886A1/en active Application Filing
- 2015-08-11 EP EP15757151.4A patent/EP3180166B1/en active Active
- 2015-08-11 JP JP2017507399A patent/JP6552602B2/en active Active
- 2015-08-11 CN CN201580026570.0A patent/CN106457533B/en active Active
- 2015-08-11 US US15/503,254 patent/US10589407B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3180166B1 (en) | 2018-06-20 |
CN106457533B (en) | 2018-11-23 |
US10589407B2 (en) | 2020-03-17 |
US20170232597A1 (en) | 2017-08-17 |
JP6552602B2 (en) | 2019-07-31 |
WO2016023886A1 (en) | 2016-02-18 |
EP2985118A1 (en) | 2016-02-17 |
JP2017526541A (en) | 2017-09-14 |
CN106457533A (en) | 2017-02-22 |
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