EP0754528A1 - Drehmoment-Schraubendreher mit akustischem und/oder visuellem Alarm - Google Patents

Drehmoment-Schraubendreher mit akustischem und/oder visuellem Alarm Download PDF

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Publication number
EP0754528A1
EP0754528A1 EP96420207A EP96420207A EP0754528A1 EP 0754528 A1 EP0754528 A1 EP 0754528A1 EP 96420207 A EP96420207 A EP 96420207A EP 96420207 A EP96420207 A EP 96420207A EP 0754528 A1 EP0754528 A1 EP 0754528A1
Authority
EP
European Patent Office
Prior art keywords
torque screwdriver
screwdriver according
torque
gutter
handle
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
Application number
EP96420207A
Other languages
English (en)
French (fr)
Other versions
EP0754528B1 (de
Inventor
Georges Heyraud
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.)
SAM Outillage SAS
Original Assignee
SAM Outillage SAS
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 SAM Outillage SAS filed Critical SAM Outillage SAS
Publication of EP0754528A1 publication Critical patent/EP0754528A1/de
Application granted granted Critical
Publication of EP0754528B1 publication Critical patent/EP0754528B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means
    • 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
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means

Definitions

  • the invention relates to an electromechanical torque screwdriver with audible and / or visual alarm.
  • Torque screwdrivers are already known in which an elastic return means, such as Belleville washers or helical spring, with adjustable calibration by a micrometric screw, determines the triggering threshold of a torque limiter interposed between the handle and the tip of the screwdriver, and comprising rollers, balls or complementary ramps.
  • an elastic return means such as Belleville washers or helical spring
  • adjustable calibration by a micrometric screw determines the triggering threshold of a torque limiter interposed between the handle and the tip of the screwdriver, and comprising rollers, balls or complementary ramps.
  • This triggering technique generates a very noticeable shock and a drop in torque in the screwdriver, but has two drawbacks.
  • the first results from the permanent compression of the elastic return means which, over time, can cause fatigue of the material constituting this means, and cause measurement inaccuracies.
  • the second drawback comes from the adjustment by micrometric screw which is long and difficult for an untrained operator.
  • Direct reading torque screwdrivers are also known in which, as in US-A-3678744, the torsion of an axial bar interposed between the handle and the end of a drive tube, mounted to rotate freely in the handle, causes the angular displacement of a mark relative to a graduated disc or sector, amplifying the reading scale.
  • the diameter of the graduated sector must be large, which leads to excessive bulk of the screwdriver. Furthermore, this type of screwdriver does not have means alerting the operator that the desired torque is reached, and therefore requires a permanent reading of the graduated sector.
  • the object of the present invention is to remedy the drawbacks of these two types of screwdrivers, while combining their advantages.
  • torque screwdrivers comprising, on the one hand, a driving tube mounted free in rotation in a tubular handle body, and having, at its free end, a nozzle for receiving a removable rotating drive member , on the other hand, a torsion rod arranged essentially inside the driving tube and one end of which is linked to this tube while its other end, arranged in the handle body, is linked to this body, and, in addition, means which, linked to the handle body, cooperate with means linked to the driving tube to indicate that the tightening torque is reached.
  • the end of the torsion rod, disposed in the handle body is linked to the latter with the interposition of electrical insulation means, so as to constitute with the driving tube the one of the branches of an electrical circuit leading to a battery disposed inside the handle body, while the other branch of the electrical circuit, powered by the same battery, comprises the handle body carrying an internal stud, of electrical contact and of adjustable position, this stud being able to cooperate with at least one of the faces of a groove substantially longitudinal, formed in a conductive sleeve integral with the drive tube and electrically isolated from the body, to trigger alarm means arranged on one of the branches of the circuit.
  • the triggering threshold is defined by the contact of the stud with one of the faces of the groove of the sleeve linked to the driving tube. This contact closes the electrical circuit which then supplies the alarm means, audible or light.
  • the value of the detected torque is adjusted by modifying the angular travel between the stud at rest and the face opposite the groove.
  • the contact pad is carried by an external pusher which, movable in a lumen of the tubular body, is provided with a mark cooperating with graduations formed on the external face of the body, at minus one of the faces, respectively of contact of the groove and the light, being longitudinal, while the other is constituted by a fragment of helix with large pitch to increase the resolution of the scale of reading of the graduation .
  • This arrangement allows, in a tool having a reduced diametrical size, and while the maximum torsion angle is small, and for example less than 30 ° to limit the fatigue rate of the torsion blade, to obtain an amplification of the interval between the graduations of the reading scale and, consequently, to increase the precision of the positioning of the pad and the precision of the measurement.
  • the torque screwdriver is composed of a metal tubular body 2, covered locally by a comfort handle 3 and by the end of a hollow plug 4, and a driving tube 6, of polygonal or cylindrical section.
  • the free end of this tube is provided with a housing 7 whose internal profile is adapted to receive hexagon nuts or any other form of impression.
  • This drive tube is metallic and is integral, at its other end, with a metallic sleeve 8 which is mounted to rotate freely inside the front end of the body 2, with the interposition of insulating washers 9.
  • This assembly tolerates longitudinal sliding of the sleeve 8 and of the tube 6 to absorb the slight reduction in length of the torsion bar, when it is twisted.
  • This torque screwdriver is therefore equipped with a torsion bar constituted by a spring leaf 10, almost the entire length of which is disposed inside the driving tube 6.
  • This blade of square, rectangular or cylindrical section, is provided with its front end of an enlarged head 10a linked in rotation, and in translation, for example, by welding or crimping to the front end of the tube 6.
  • the rear end of the blade is also provided with an enlarged head 10b, of larger dimensions than that 10a, which is housed in the extreme slot 12 of a socket 13 made of insulating material, and in particular synthetic material.
  • a transverse pin 14 ensures the connection in rotation and translation of the head 10b with the tubular body 2. This pin passes through the sleeve 13 right through and engages, by its ends, in the appropriate bores of the body 2. In its crossing of the head 10b, it is isolated from this head by a ring 15 made of insulating material, visible in FIGS. 1 and 2.
  • the ring 15 is composed of two elements each secured to one of the parts of the socket 13.
  • the socket 13 serves as a housing for a stick battery 16, one of the terminals of which, in this case the positive terminal, defines the first branch of an electrical circuit comprising the torsion blade 10, the driving tube 6, the sleeve 8 , while the negative terminal of the battery comes into contact with another branch composed of a conductive strip 17 supplying an audible warning device 18, of a conductive strip 19 going from the audible warning device 18 to the rear end of the metal body 2.
  • the closing means of the two branches of this electrical circuit are constituted by means which make it possible to determine the tightening torque from which the horn 18 must come into operation. These means are in the embodiment shown, constituted by a contact pad 20 made of conductive metal and electrically connected to the body 2, and by one of the faces 21, 22 of a gutter 11 disposed substantially longitudinally in the sleeve. 8.
  • the contact pad 20 is slidably mounted in a longitudinal slot 23 formed at the anterior end of the body 2, and is secured by a radial screw 24, a pusher 25 made of synthetic material.
  • This pusher comprises two elastic wings 26 (FIG. 5) which make it possible to make up for the functional clearances and slide, with gentle friction, against the external face of the body.
  • the actuation of the screw 24 makes it possible to adjust the tightening of the elastic wings 26 and the clearance of the pusher, and possibly to block the pusher in a position to temporarily fix the torque at a determined value.
  • the pusher 25 is provided with at least one mark 27 cooperating with a graduation 28.
  • it comprises two marks cooperating with two graduations made one in Newton meters, the another in foot-pound.
  • the tightening torque is transmitted from the body to the torsion blade 10, and from the torsion blade to the driver tube 6.
  • the body pivots relative to the driver tube 6, which causes the contact pad 20 to approach the face 21 of the gutter 11, then the contact between these two elements.
  • the electric circuit being closed, the energy of the battery supplies the horn 18 whose sound output is oriented along the arrows 31 in a cavity 4a of the hollow plug 4, closed by a grid 4b.
  • At least one of the faces of the gutter 11, and in this case the face 21, is constituted by a propeller fragment with large pitch to increase the resolution of the scale of reading the graduation.
  • This propeller makes it possible to distribute, over the greater part of the length of the sleeve 8, the reading scale. Therefore, it has much more intervals between graduations spaced apart if this graduation were distributed circularly over a graduated sector extending over an arc ⁇ corresponding to the maximum angle of twist, and shown in FIG. 4, having a value less than 30 °.
  • Another advantage of this construction is that it is compact and improves the reliability of the measurement accuracy.
  • Figure 3 shows that the light 23 for the sliding of the pad 20 locally has a buttonhole 23a allowing the vertical introduction of the contact pad 20. As shown in Figure 1, this light is obscured by the comfort handle 3, when that -This is placed on the tubular body 2, also preventing untimely disassembly of the pusher.
  • the plug 4 partially covering the rear end of the body 2, it is linked to this body by at least one radial screw 30, so as to allow it to be dismantled to replace the battery 16.
  • the gutter 11 of the sleeve 8 is only equipped with a single helical face 21 allowing control only tightening torques of screws to the right and not allowing determine an unlocking torque.
  • the rotation in the unlocking direction quickly brings the pad 20 into contact with the face 22 of the gutter 11 and, whatever the torque, triggers the alarm to encourage to stop the rotation , and avoid destroying the contact means, in the event of an error in the direction of rotation.
  • the sleeve 8 To allow the measurement of the locking and unlocking torques, the sleeve 8 must be equipped, as shown in FIG. 6, with a gutter 11 comprising two opposite helical faces, respectively 21a and 22a whose propellers are opposite and have no not necessarily the same step, therefore not the same reading scale.
  • the gutter 11 of the sleeve 8 is provided, at least on one side, with a stepped ramp 32.
  • This ramp is associated with a reading scale 28 of the body 2 comprising zones corresponding to the stages of the ramp and advancing, by successive jumps, the value of the torque.
  • Such a stepped ramp can also be used with a device of the type shown in FIGS. 9 and 10 in which the contact pad 20 is secured to a positioning finger 33 and to a push-button 34 with spring return 35.
  • This positioning finger 33 is intended to penetrate, under the action of the return spring 35, into bores 36 distributed along the lumen 23 of the tubular body 2.
  • the setting of the triggering threshold is carried out by successive jumps by pressing the pusher 34 to make the positioning finger 33 escape from the corresponding bore 36, and allow the pusher 34 and the stud 20 to slide.
  • This pusher special can also be fitted with elastic lips which, of the type shown in Figure 5, combine with the spring or replace the spring.
  • the gutter 11 is provided with two lateral and longitudinal faces 21b, 22b, while it is the lumen 23c of the body 2 which is in a helix to obtain better reading scale resolution.
  • This embodiment makes it possible to obtain the same advantages and results as that described with reference to FIGS. 1 to 5.
  • the sleeve 8 has a gutter 11 with lateral and longitudinal faces 21b, 22b, as shown in Figure 8, and the contact pad 20a is cylindrical and wedged eccentrically on a screw 40 screwed radially in the body 2, and associated with a locking nut 42. It is easily conceivable that by pivoting the screw, the position of the face of the stud coming into contact is modified with the lateral face of the groove opposite, and, consequently, the idle stroke of the handle relative to the sleeve.
  • the adjustment nut is capped by a cap 41 ensuring the inviolability of the adjustment.
  • the torque screwdriver differs from the previous one in that, in addition to the horn 18, it is provided with at least one light alarm 43, and for example of three leds arranged at 120 °. Furthermore, the sounder 18 and the lighters 43 are arranged in the central part of the body 2, and more precisely, in a cavity 44 formed in the rear part 13a of the insulating sleeve also comprising a front part 13b. As shown in FIG. 15, the latter comprises the slot 12 receiving an enlarged head 10b of the torsion blade and, opposite this slot, a sound reflection cone 51.
  • the part 13a is slidably mounted in the body 2 and is separated from part 13b by a space.
  • the battery is in contact with a blade 46, integral with the horn 18, and a conductive plug 47, attached and fixed in the end of the body 2, either by threading, or by bayonet lugs.
  • the horn 18 is connected by an electrical circuit 48 to the warning lights 43, and from there to the enlarged head 10b of the bending blade. This connection is provided by a conductor 59 which passes through a groove 60 communicating with the slot 12 ( Figure 15).
  • this screwdriver can indifferently be equipped with an audible alarm or a visual alarm, without going beyond the ambit of the invention.
  • the drive tube 6 has an internal and external hexagonal section, so that the housing 7 formed at its end is also hexagonal and is capable of receiving removable end pieces 55 having a groove 56 able to cooperate with the two pins 57, passing radially through the tube 6, with a retaining ring 58.
  • the embodiment shown in Figures 16 to 18 differs from the previous ones by the shape of the gutter 11.
  • it is made in a metal part which has, in cross section, the shape of a "U" , whose flared wings 64, 65 delimit the contact faces 21, 22 and whose core 66 is fixed, for example by spot welding 67, on one of the facets of the hexagonal profile constituting the tube 6.
  • the wings 64, 65 are each secured to an external bent return, respectively 64a and 65a, the purpose of which is to facilitate the positioning of the part 63 on the tube 6 during welding at 67, and which are therefore not linked to this tube.
  • the wings of the gutter thus formed have an elastic deformation faculty allowing them to avoid deterioration of the contact means, in the event of errors of handling the screwdriver.
  • FIG. 16 shows that the tube 6 is carried by a ring 68 which is mounted to rotate freely at the free end of the body 2.
  • This ring is made of synthetic material, electrically insulating, and covers the front end of the body 2 for during the measurement, avoid closing the electrical circuit between the body 2 and the tube 6 by external conductive elements.
  • the outer face of the body 2 is covered at its anterior end with an adhesive film 71 of insulating material, carrying the graduations of the reading scales.
  • the rear end of the tube 6 is provided with a cylindrical part 69, mounted to rotate freely in a bearing 70 of the insulating sleeve 13c. Except for these constructive differences, this screwdriver is similar to the previous embodiments and works in the same way.
  • the torque screwdriver according to the invention allows, regardless of its small size, its reliability and its simplicity of construction, to produce a whole range of screwdrivers that can meet all needs, both for measurement of tightening torques, than loosening torques.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Measurement Of Current Or Voltage (AREA)
EP19960420207 1995-07-18 1996-06-20 Drehmoment-Schraubendreher mit akustischem und/oder visuellem Alarm Expired - Lifetime EP0754528B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509048A FR2736858B1 (fr) 1995-07-18 1995-07-18 Tournevis dynamometrique electromecanique a alarme sonore et/ou visuelle
FR9509048 1995-07-18

Publications (2)

Publication Number Publication Date
EP0754528A1 true EP0754528A1 (de) 1997-01-22
EP0754528B1 EP0754528B1 (de) 1998-11-18

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ID=9481375

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Application Number Title Priority Date Filing Date
EP19960420207 Expired - Lifetime EP0754528B1 (de) 1995-07-18 1996-06-20 Drehmoment-Schraubendreher mit akustischem und/oder visuellem Alarm

Country Status (4)

Country Link
EP (1) EP0754528B1 (de)
DE (1) DE69600986D1 (de)
ES (1) ES2126372T3 (de)
FR (1) FR2736858B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017109117B4 (de) * 2017-04-27 2021-05-06 Wiha Werkzeuge Gmbh Schraubendreher und Verfahren zum Anziehen einer Schraube

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205510A (en) * 1938-04-07 1940-06-25 Wolfram Karl Change-over torque measuring tool for several measuring ranges
DE1603984A1 (de) * 1968-01-25 1971-09-09 Siemens Ag Drehmoment-Schraubenzieher
US3678744A (en) * 1969-11-14 1972-07-25 Dresser Ind Torque measuring hand screwdriver
EP0335809A1 (de) * 1988-04-01 1989-10-04 SAM OUTILLAGE Société Anonyme Elektromechanischer Drehmomentschlüssel
EP0393852A1 (de) * 1989-04-21 1990-10-24 Mhh Engineering Co Ltd Schraubendreher mit Drehmomentanzeige

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205510A (en) * 1938-04-07 1940-06-25 Wolfram Karl Change-over torque measuring tool for several measuring ranges
DE1603984A1 (de) * 1968-01-25 1971-09-09 Siemens Ag Drehmoment-Schraubenzieher
US3678744A (en) * 1969-11-14 1972-07-25 Dresser Ind Torque measuring hand screwdriver
EP0335809A1 (de) * 1988-04-01 1989-10-04 SAM OUTILLAGE Société Anonyme Elektromechanischer Drehmomentschlüssel
EP0393852A1 (de) * 1989-04-21 1990-10-24 Mhh Engineering Co Ltd Schraubendreher mit Drehmomentanzeige

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017109117B4 (de) * 2017-04-27 2021-05-06 Wiha Werkzeuge Gmbh Schraubendreher und Verfahren zum Anziehen einer Schraube

Also Published As

Publication number Publication date
DE69600986D1 (de) 1998-12-24
ES2126372T3 (es) 1999-03-16
FR2736858B1 (fr) 1997-10-10
FR2736858A1 (fr) 1997-01-24
EP0754528B1 (de) 1998-11-18

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