EP0445084A2 - Werkzeug zum Anbringen von hohlen Einsätzen mit Innengewinde - Google Patents

Werkzeug zum Anbringen von hohlen Einsätzen mit Innengewinde Download PDF

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Publication number
EP0445084A2
EP0445084A2 EP91830054A EP91830054A EP0445084A2 EP 0445084 A2 EP0445084 A2 EP 0445084A2 EP 91830054 A EP91830054 A EP 91830054A EP 91830054 A EP91830054 A EP 91830054A EP 0445084 A2 EP0445084 A2 EP 0445084A2
Authority
EP
European Patent Office
Prior art keywords
insert
drill
screwdriver
motor
spindle
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.)
Withdrawn
Application number
EP91830054A
Other languages
English (en)
French (fr)
Other versions
EP0445084A3 (en
Inventor
Vincenzo Cariati
Roberto Lambardi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Far Srl
Original Assignee
Far Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Far Srl filed Critical Far Srl
Publication of EP0445084A2 publication Critical patent/EP0445084A2/de
Publication of EP0445084A3 publication Critical patent/EP0445084A3/en
Withdrawn legal-status Critical Current

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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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0007—Tools for fixing internally screw-threaded tubular fasteners
    • B25B27/0014—Tools for fixing internally screw-threaded tubular fasteners motor-driven
    • 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 present invention falls within the art field of hand-held power tools and relates to an electric screwdriver-drill intended in particular for the application of internally threaded hollow inserts.
  • Such inserts are applied, for instance, to sheet metal or similar flat material of limited thickness in order to provide anchorages for fasteners such as screws, etc..
  • the insert comprises a cylindrical element with a hollow cylindrical bore, of which one end affords a flange and the remaining end is internally threaded and merges with a central part of reduced thickness designed to deform radially by upsetting when force is applied to draw the threaded end back toward the flange.
  • the prior art embraces pneumatic drivers provided with a dual control by which a bolt, threaded at one end to match the internal thread of the insert, is screwed into and unscrewed from the cylindrical element in two distinct steps. More exactly, the bolt is inserted into the bore from the flanged end and screwed tight so as to draw the threaded end of the cylindrical element forcibly toward the flange, which remains sandwiched between a locating surface afforded by the tool and the flat surface of the material to which the insert is fixed; thereafter, the bolt is unscrewed and removed to vacate the bore and leave the insert ready for use.
  • this type of tool requires a system for verifying and controlling the degree of torque transmitted to the upsetting bolt that is somewhat complex in mechanical terms.
  • the object of the present invention is to provide a hand-held screwdriver-drill in which the direction of rotation can be reversed automatically to remove the upsetting bolt once the screwing operation is complete and the insert is secured in position.
  • a screwdriver-drill according to the present invention, denoted 1 in its entirety, is intended in particular for fitting inserts 50 of the type shown in fig 1, consisting in a hollow cylindrical element 51 that affords a flange 52 at one end, and an internally threaded stretch 53 at the other end.
  • the flange 52 and the threaded end 53 are interconnected by a central section 54 of reduced thickness which is designed to upset, spreading in the radial direction, when a contracting force is applied the insert 50 in such a way as to draw the threaded end 53 toward the flanged end 52.
  • this contracting force has the effect of tightening the cylindrical element 51 against the panel 33 on the side opposite from the flange 52.
  • the drill 1 is conventional in basic embodiment, comprising a case 4 that houses and supports a power mechanism including an electric motor 2 and a prismatic shank or spindle 3 for the connection of attachments or chucking devices (not illustrated).
  • the case 4 affords an integrally moulded hand grip enabling an operator to lay hold on the tool, and an on-off switch 5 controlling the electrical power supply line 6 to the electric motor 2.
  • the drill 1 according to the invention comprises an interchangeable upsetting bolt 7 of which one end 8 is threaded to match the internally threaded end 53 of the insert 50 and the opposite end 9 is embodied as a shank coupled positively and coaxially to the prismatic spindle 3.
  • 11 denotes retaining and support means associated with and removable from the case 4, which serve both as a depth gauge designed to locate against the flange 52 of the insert 50, and as a means of disallowing axial movement of the bolt 7 relative to the flange 52 when the bolt 7 is introduced into the insert 50 from the flanged end, engaged with the internally threaded end 53 of the cylindrical element 51 and set in rotation by the prismatic spindle 3 to apply the upsetting force.
  • the drill 1 further comprises an electronic unit 10 for monitoring and controlling the operation of the electric motor 2, connected to the electrical power supply line 6 between the on-off switch 5 and the motor 2; the unit 10 in question comprises at least one voltage regulator 12 wired on the input side to the switch 5, hence to the power supply 6, and able to generate output voltage of a predetermined value that is a function of the maximum rated torque of the motor 2.
  • the output of the voltage regulator 12 is connected to the input of an absorbed current transducer 13, the output of which is a continuous voltage proportional to the current absorbed by the motor 2; this is used to pilot a device 14 capable of inverting the polarity of the power supply to the electric motor 2, hence reversing its direction of rotation, whenever the current input to the transducer 13 becomes equal to or greater than a predetermined value corresponding, in practice, to the current absorbed by the motor 2 in developing a degree of power such as will torque the spindle 3 sufficiently to clinch the insert 50, drawing the threaded end 53 further toward the flange 52 at the moment in which the central section 54 has been fully upset by the action of the bolt 7 and thus securing it to best possible effect.
  • the voltage regulator 12 and the absorbed current transducer 13 are interlocked to means 15 by which to control the value of the input voltage to the inverter 14; these same means 15 also control the maximum absorbed current value, determined on the basis of the mechanical deformation properties of the insert 50, which triggers the activation of the inverter 14.
  • Such control means 15 might consist in a regulator calibrated in discrete steps, with a continuous regulator to give fine adjustment.
  • the output from the absorbed current transducer 13 to the inverter 14 is taken off additionally to an electronic monitoring and control loop 16 capable of limiting the threshold current values beyond which the inverter is triggered into operation.
  • the monitoring and control loop 16 comprises a filter 17 serving to eliminate mains interference and limit the peak voltage at the output of the absorbed current transducer 13 when the motor 2 is started up, a threshold circuit 18 of which the output signal is dependent on a predetermined input value, and a corrective delay network 19 serving both to effect an additional filtering action in respect of the voltage signal from the absorbed current transducer 13 by eliminating the residual peak value when the motor is started, and to delay the activation of the inverter 14 for a selectable interval sufficient, in practical terms, to ensure that the insert 50 is fully upset and clinched.
  • Such a delay is indispensable should it happen, as the insert 50 begins to deform, that greater power is required from the electric motor 2 in order to generate a torque capable of overcoming resistance offered by a particularly rigid or tough insert 50; higher power in turn dictates proportionally higher values of absorbed current, and earlier activation of the inverter device 14 by the transducer 13.
  • the corrective delay network 19 will retard the inversion signal for a duration sufficient to allow the motor 2 to clinch the insert 50 fully.
  • the corrective network 19 is adjustable, in that its delay time constant in respect of the input signal can be increased or decreased.
  • the output of the corrective network 19 is directed into a memory circuit 20 by which the correction signal is retained so as to avoid any unwarranted interruption of the inversion signal, and emission of a further inversion signal, in the event of a momentary break in the power supply 6 occasioned by accidental release of the switch 5, for example.
  • the inverter 14 is also wired direct to the power supply input 6 by way of an auxiliary circuit 6a and activated at the moment when this same circuit is activated.
  • the threshold circuit 18 is interlocked likewise to the control means 15, and its threshold value thus regulated according to the mechanical deformation properties of the insert 50.
  • the inverter 14 is connected further to means 14a for reversing the direction of rotation manually.
  • the memory circuit 20 is interlocked to a relative reset/reset-delay circuit 21 wired directly in its turn to the on-off switch 5, by means of which the memory reset can be retarded.
  • This is of particular importance in preventing parasitic oscillations or unwanted reverse manoeuvres; in effect, time must be allowed for the motor 2 to stand still before a further cycle can be commenced in order to avoid inversions of rotation with the motor still in movement, and the electrotechnical problems that would ensue from such an event.
  • the upsetting bolt 7 (fig 1) exhibits an intermediate boss, denoted 7g, whilst the shank end 9 coupled with the prismatic spindle 3 affords a socket 23 matched to and accommodating the profile of the spindle 3.
  • this end 9 of the bolt 7 is fashioned in two parts: a prismatic shank 9t integral with the bolt 7, and a sleeve 31 which positively ensheaths both the prismatic spindle 3 and the prismatic shank 9t of the bolt 7.
  • the retaining and support means 11 consist in an axially hollow shroud 24, an interchangeable stop collar 27, and a locking cap 28.
  • the stop collar 27 can be fastened to and removed from the shroud 24, and is designed to register with the flange 52 of the insert 50; when fitted, the collar is disallowed angular movement about the axis of rotation of the spindle 3.
  • a screw fit between the cap 28 and the shroud 24 permits of securing the collar 27 and allows its removal and replacement according to the external diameter of the insert 50, thereby achieving the interchangeability aforementioned.
  • the shroud 24 is embodied in two coaxial parts 29 and 30, the first 29 fastened permanently to the case 4 and the second 30 associated with the first by fitment of the locking cap 28; accordingly, the second part 30 can be made interchangeable to suit the external diameter of the insert 50.
  • the two parts 29 and 30 of the shroud 24 thus provide the seating 25 for the dynamic restraint means 26, which can take the form of conventional thrust bearings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Drilling Tools (AREA)
EP19910830054 1990-03-02 1991-02-18 Tool for the application of internally threaded hollow inserts Withdrawn EP0445084A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT00337190A IT1238264B (it) 1990-03-02 1990-03-02 Trapano avvitatore.
IT337190 1990-03-02

Publications (2)

Publication Number Publication Date
EP0445084A2 true EP0445084A2 (de) 1991-09-04
EP0445084A3 EP0445084A3 (en) 1992-03-11

Family

ID=11105879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910830054 Withdrawn EP0445084A3 (en) 1990-03-02 1991-02-18 Tool for the application of internally threaded hollow inserts

Country Status (2)

Country Link
EP (1) EP0445084A3 (de)
IT (1) IT1238264B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572819A1 (de) * 1992-05-29 1993-12-08 ALFRED HONSEL NIETEN- UND METALLWARENFABRIK GMBH & CO. Verfahren zum Bestimmen der Abreisskraft des Zugdorns eines Blindniets und zugehöriges Blindnietsetzgerät
EP0653259A1 (de) * 1993-11-16 1995-05-17 GESIPA Blindniettechnik Gesellschaft mit beschränkter Haftung Verfahren zum Setzen von Blindnieten und Blindnietmuttern und Setzgerät für Blindniete und Blindnietmuttern
EP0922536A1 (de) * 1997-12-12 1999-06-16 Herbert Schruff Verfahren und Gerät zum Setzen von Blindnietmuttern
DE10106360C1 (de) * 2001-02-12 2002-07-11 Rothenberger Werkzeuge Ag Verfahren zum automatischen Steuern von elektro-hydraulischen Handwerkzeugen und Anordnung hierfür
US20100090639A1 (en) * 2004-01-13 2010-04-15 Cameron International Corporation Control System of an Actuator for the Actuation of Submarine Devices
CN104044106A (zh) * 2013-03-13 2014-09-17 松下电器产业株式会社 电动工具
DE102014108398A1 (de) * 2014-06-13 2015-12-17 Techway Industrial Co., Ltd. Elektrisches Nietmutterwerkzeug und ein Steuergerät dafür
DE102018216702A1 (de) * 2018-09-28 2020-04-02 Robert Bosch Gmbh Verfahren zur Steuerung oder Regelung einer Handwerkzeugmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008598A (en) * 1960-09-28 1961-11-14 Martin Alan Rivet nut tool
GB2098528A (en) * 1982-04-23 1982-11-24 Desoutter Ltd A power tool
US4858312A (en) * 1988-04-18 1989-08-22 Ideal Industries, Inc. Torque control for automatic connector assembly tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008598A (en) * 1960-09-28 1961-11-14 Martin Alan Rivet nut tool
GB2098528A (en) * 1982-04-23 1982-11-24 Desoutter Ltd A power tool
US4858312A (en) * 1988-04-18 1989-08-22 Ideal Industries, Inc. Torque control for automatic connector assembly tool

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572819A1 (de) * 1992-05-29 1993-12-08 ALFRED HONSEL NIETEN- UND METALLWARENFABRIK GMBH & CO. Verfahren zum Bestimmen der Abreisskraft des Zugdorns eines Blindniets und zugehöriges Blindnietsetzgerät
EP0653259A1 (de) * 1993-11-16 1995-05-17 GESIPA Blindniettechnik Gesellschaft mit beschränkter Haftung Verfahren zum Setzen von Blindnieten und Blindnietmuttern und Setzgerät für Blindniete und Blindnietmuttern
EP0922536A1 (de) * 1997-12-12 1999-06-16 Herbert Schruff Verfahren und Gerät zum Setzen von Blindnietmuttern
US6029332A (en) * 1997-12-12 2000-02-29 Schruff; Herbert Rivet setting tool
US6223409B1 (en) 1997-12-12 2001-05-01 Herbert Schruff Rivet setting tool
DE10106360C1 (de) * 2001-02-12 2002-07-11 Rothenberger Werkzeuge Ag Verfahren zum automatischen Steuern von elektro-hydraulischen Handwerkzeugen und Anordnung hierfür
US20100090639A1 (en) * 2004-01-13 2010-04-15 Cameron International Corporation Control System of an Actuator for the Actuation of Submarine Devices
US8810427B2 (en) * 2004-01-13 2014-08-19 Cameron International Corporation Control system of an actuator for the actuation of submarine devices
CN104044106A (zh) * 2013-03-13 2014-09-17 松下电器产业株式会社 电动工具
US9270211B2 (en) 2013-03-13 2016-02-23 Panasonic Intellectual Property Management Co., Ltd. Electric power tool
CN104044106B (zh) * 2013-03-13 2016-06-29 松下知识产权经营株式会社 电动工具
DE102014108398A1 (de) * 2014-06-13 2015-12-17 Techway Industrial Co., Ltd. Elektrisches Nietmutterwerkzeug und ein Steuergerät dafür
DE102014108398B4 (de) * 2014-06-13 2016-12-08 Techway Industrial Co., Ltd. Elektrisches Nietmutterwerkzeug
DE102018216702A1 (de) * 2018-09-28 2020-04-02 Robert Bosch Gmbh Verfahren zur Steuerung oder Regelung einer Handwerkzeugmaschine
US11697194B2 (en) 2018-09-28 2023-07-11 Robert Bosch Gmbh Method for controlling or regulating a hand-held power tool

Also Published As

Publication number Publication date
IT9003371A0 (it) 1990-03-02
EP0445084A3 (en) 1992-03-11
IT9003371A1 (it) 1991-09-03
IT1238264B (it) 1993-07-12

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