EP0297041B1 - Hand tool - Google Patents

Hand tool Download PDF

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Publication number
EP0297041B1
EP0297041B1 EP88810405A EP88810405A EP0297041B1 EP 0297041 B1 EP0297041 B1 EP 0297041B1 EP 88810405 A EP88810405 A EP 88810405A EP 88810405 A EP88810405 A EP 88810405A EP 0297041 B1 EP0297041 B1 EP 0297041B1
Authority
EP
European Patent Office
Prior art keywords
control element
tool
hand tool
pivot
tool according
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.)
Expired - Lifetime
Application number
EP88810405A
Other languages
German (de)
French (fr)
Other versions
EP0297041A3 (en
EP0297041A2 (en
Inventor
Anton Neumaier
Uto Plank
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to AT88810405T priority Critical patent/ATE63712T1/en
Publication of EP0297041A2 publication Critical patent/EP0297041A2/en
Publication of EP0297041A3 publication Critical patent/EP0297041A3/en
Application granted granted Critical
Publication of EP0297041B1 publication Critical patent/EP0297041B1/en
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
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0034—Details of shank profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0042—Ball-shaped locking members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B25D2217/0065—Use of dust covers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/16—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor
    • Y10T408/165—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor to control Tool rotation

Definitions

  • the invention relates to a hand-held device with a tool holder for tools and a sensing device serving to detect the contour of the tools and interacting with a device-side sensor for initiating a switching process, the sensing device at least one control element which can be inserted into a guide bore of the tool holder essentially transversely to the tool axis and a Has sensing element for the control.
  • an electrically operated hand-held device which automatically sets different operating modes.
  • the device has a push-button device for initiating the switching process, the contour of the insertion shaft being scanned for the tool used in a tool holder of the device and used for the switching process.
  • the feeler device consists of a slide that can be adjusted along the axis of the tool holder and one or more control elements, on which the slide _ is axially supported, depending on the contour on the tool side.
  • a device with a sensing device for detecting the contour of the tool to initiate a switching operation is e.g. known from DE-A-2106023.
  • the invention has for its object to provide a handheld device with a key device for tool-related initiation of switching operations, which allows a short length of the handheld device and is suitable for scanning even less pronounced contours.
  • the object is achieved by the Haud device according to claim 1.
  • the lever arm facing away from the control element performs a counter-pivoting movement with respect to the lever arm cooperating with the control element.
  • a corresponding choice of the length of the lever arms enables a translation of the radial engagement or disengagement path of the control element with respect to the lever arm facing away.
  • the contours to be scanned can be carried out with such a small design that the strength of the insert shaft is not impaired.
  • the swivel levers rotate together with the tool holder about the axis of the tool holder, the lever arms facing away from the control elements similarly causing their swivel position in the sensor, for example inductively, to trigger switching signals.
  • the switching signals can be used to carry out switching operations.
  • the contour of an inserted tool to be scanned can be used to set a specific speed in connection with a specific number of impacts acting on the tool.
  • a plurality of swivel levers which are offset in the circumferential direction of the tool holder, are preferably provided.
  • the offset of the pivot levers and the control elements assigned to them is, for example, 90 °, ie there are two pairs of diametrically opposed pivot levers and control elements in the same axial position relative to the tool holder.
  • the spring levers act on the pivot levers with the one lever arm against the control elements.
  • the spring means are, for example, compression springs acting on each swivel lever.
  • the swivel levers on the lever arms facing away from the control elements have mutually different effective areas entering the detection area of the sensor.
  • one pair expediently has the lever arms with larger active surfaces.
  • the lever arm facing away from the control element is of magnetic design. It is possible to design only this lever arm magnetically, preferably permanently magnetically, or to design the pivot lever as a whole as a magnet.
  • a Hall element is suitable as a sensor, which has the advantage of low production costs. The Hall element recognizes a magnetic field according to the positions of the swivel levers.
  • the pivot levers are preferably guided in an actuating sleeve which can be rotated to a limited extent with respect to the tool holder.
  • the actuating sleeve expediently interacts with the locking bodies serving for holding the tools in the tool holder, so that by turning the actuating sleeve into a defined rotational position, the pivoting levers reach the functionally effective position for the control elements and the locking bodies move into the locking position.
  • a defined mutual positional dependency of the mounting of the tools for supporting the swivel levers on the control elements is achieved. This has easy handling advantages with regard to the control of the switching processes, in particular in connection with lever arms which have different effective areas.
  • control elements are preferably designed as balls. Their geometric shape is advantageous in terms of assembly and function.
  • At least one recess for the control element of the feeler device is provided on the tool for the handheld device on the insertion shaft.
  • the depressions expediently designed as longitudinal grooves form the contour to be scanned.
  • the depth of the longitudinal grooves can be small, since the pivoting lever of different lengths has the above-mentioned adequate translation, that is to say enlargement of the radial engagement and disengagement path of the control elements.
  • the insertion shaft is provided with more than one longitudinal groove, the longitudinal grooves are distributed over the circumference of the insertion shaft. This offers the possibility of placing the longitudinal grooves at the same or a different angular distance from one another. Different angular distances can be used as influencing factors that can be used in the generation of switching signals.
  • the tool can also be assigned to hand tools of different types by corresponding length of the longitudinal grooves or by longitudinal grooves arranged one behind the other.
  • the hand-held devices of different designs differ from one another, for example in terms of the switchable functions or the power, and also have tactile devices of different dimensions. This can ensure that a specific tool can only be used in handheld devices suitable for this and can control different operating modes here. If such a tool is used in a handheld device not intended for this purpose, no switching signals are generated.
  • the hand-held device shown in the drawing with the front area is a hammer drill which is able to convey clamped tools rotational movement and impacts.
  • the impact energy given off to the tools is passed on to a workpiece, which requires a limited axial displacement of the tools in the hammer drill.
  • the 1 to 3 has an essentially sleeve-shaped tool holder 1, to which a guide cylinder 2 is connected in one piece with the same axis.
  • the guide cylinder 2 is penetrated by a bearing bore 2a, into which a guide bore 1a of smaller diameter protruding through the tool holder 1 opens.
  • an anvil 3 and a striking piston 4 of a percussion mechanism known per se, which acts upon it and is indicated by an indication are displaceably arranged.
  • the striker 3 transmits the impacts imparted by the percussion piston 4 to a tool 5 which is inserted into the guide bore 1 a with a cylindrical insertion shaft 5 a and projects with the free end into the effective area of the striker 3.
  • the countershaft 8 also carries a bevel gear 9 which is in engagement with a driving bevel gear 11.
  • the latter is driven by a shaft 12 and a gear 13, which meshes with a motor pinion 14 which is indicated by an indication.
  • the insert 5a has two diametrically opposed driving grooves 5b, 5c for holding and rotatingly driving the tool 5.
  • Spherical locking bodies 15, 16 engage in these, which are mounted in the tool holder 1 so as to be radially displaceable and are brought into the engagement position shown by an actuating sleeve 17.
  • the actuating sleeve 17 has an inner contour 17a, which is known per se and changes in the circumferential direction, on which the locking bodies 15, 16 are supported radially.
  • the actuating sleeve 17 is used to rotate the actuating sleeve 17.
  • An actuating sleeve 18 that is firmly seated on the front of the tool holder 1 tight protective ring 19 prevents the penetration of cuttings and the like into the interior of the device.
  • control elements in the form of balls 21, 22, 23, 24 are also radially displaceable in the tool holder 1 and, as can be seen in FIG. 2, are offset from one another at a uniform angular distance.
  • the balls 21, 22, 23, 24 can have up to four depressions in the form of longitudinal grooves 5d, 5e, 5f, 5g (FIGS 8) can be assigned.
  • an equal number of pivot levers 25, 26, 27, 28 is guided in slot-shaped recesses 17b, 17c, 17d, 17e of the actuating sleeve 17.
  • a spring ring 29, which is supported radially on the actuating sleeve 17 and holds all the pivot levers 25, 26, 27, 28, serves as the pivot bearing.
  • a lever arm 25a, 26a, 27a, 28a of the pivot levers 25, 26, 27, 28 is supported in each case on a ball 21, 22, 23, 24 from.
  • the balls 21, 23 are opposite two longitudinal grooves 5d, 5f on the tool side, so that these balls are inserted into these longitudinal grooves.
  • Compression springs 31, 32, 33, 34 serve to engage, and act on a second lever arm 25b, 26b, 27b, 28b facing away from the balls 21, 22, 23, 24.
  • This lever arm 25b, 26b, 27b, 28b in each case executes an opposite pivotal movement to the associated other lever arm 25a, 26a, 27a, 28a.
  • slot-shaped passage openings 17g, 17h, 17i, 17j are provided on an annular extension 17f of the actuating sleeve 17. 1 and 3 show, the pivoted lever arms 25b and 27b enter the passage openings 17g and 17i. As can also be seen in FIG. 3, the lever arms 25b, 26b, 27b, 28b facing away from the balls 21, 22, 23, 24 have different widths in pairs, which also applies analogously to the passage openings 17g, 17h, 17i, 17j.
  • a sensor 35 is arranged at a small radial distance from the extension 17f in the axial region of the passage openings 17g, 17h, 17i, 17j.
  • the actuating sleeve 17 is rotated to a limited extent via the actuating sleeve 18.
  • the locking bodies 15, 16 can emerge radially in known alternative niches of the inner contour 17a;
  • the pivot levers 25, 26, 27, 28 reach the balls 21, 22, 23, 24 from the radial projection, as a result of which they move from the region of the recesses 17b, 17c, 17d, 17e into the region of recesses 17k, 17l, 17m , 17n (Fig. 2) can escape radially.
  • FIG. 4 the tool 5 is shown in an embodiment which differs from FIGS. 1 and 2 with regard to the longitudinal grooves. Only the longitudinal groove 5e is present here, as is also illustrated in FIG. 5.
  • 6 are two diametrically opposed longitudinal grooves 5d, 5e, in FIG. 7 three longitudinal grooves 5d, 5e, 5f at an unequal angular distance and in FIG. 8 four longitudinal grooves 5d, 5e, 5f, 5g at the same angular distance from one another arranged. Further arrangements of longitudinal grooves are also possible and can be used to achieve different switching signals.

Abstract

A hand-held device with a holder for a working tool has a sensing mechanism for automatically initiating different operating modes. Different configurations of working tools inserted into the holder can be sensed by sensing elements in the form of balls. The balls cooperate with pivotal levers and a sensor for producing switching signals for initiating a switching operation.

Description

Die Erfindung betrifft ein Handgerät mit einer Werkzeugaufnahme für Werkzeuge und einer dem Erfassen der Kontur der Werkzeuge dienenden, mit einem geräteseitigen Sensor zusammenwirkenden Tastvorrichtung zum Einleiten eines Schaltvorganges, wobei die Tastvorrichtung zumindest ein im wesentlichen quer zur Werkzeugachse in eine Führungsbohrung der Werkzeugaufnahme einrückbares Steuerelement und ein Tastorgan für das Steuerelement aufweist.The invention relates to a hand-held device with a tool holder for tools and a sensing device serving to detect the contour of the tools and interacting with a device-side sensor for initiating a switching process, the sensing device at least one control element which can be inserted into a guide bore of the tool holder essentially transversely to the tool axis and a Has sensing element for the control.

Aus der EP-A-272209 (offenlegungstag 22.06.88, Stand der Technik gemäß Artikel 54(3)) ist ein elektrisch betriebenes Handgerät bekannt, welches unterschiedliche Betriebsarten automatisch einstellt. Hierzu verfügt das Gerät über eine Tastvorrichtung zum Einleiten des Schaltvorganges, wobei dem jeweils in eine Werkzeugaufnahme des Gerätes eingesetzten Werkzeug die Kontur des Einsteckschaftes abgetastet und für den Schaltvorgang verwertet wird. Die Tastvorrichtung besteht aus einem entlang der Achse der Werkzeugaufnahme verstellbaren Schieber und einem oder mehreren Steuerelementen, an denen sich der Schieber _ je nach werkzeugseitiger Kontur _ axial abstützt.From EP-A-272209 (day of disclosure 22.06.88, prior art according to Article 54 (3)) an electrically operated hand-held device is known which automatically sets different operating modes. For this purpose, the device has a push-button device for initiating the switching process, the contour of the insertion shaft being scanned for the tool used in a tool holder of the device and used for the switching process. The feeler device consists of a slide that can be adjusted along the axis of the tool holder and one or more control elements, on which the slide _ is axially supported, depending on the contour on the tool side.

Ein Gerät mit einer dem Erfassen der Kontur der Werkzenge dienenden Tastvorrichtung zum Einleiten eines Schaltvorganges ist z.B. durch die DE-A-2106023 bekannt.A device with a sensing device for detecting the contour of the tool to initiate a switching operation is e.g. known from DE-A-2106023.

Der Erfindung liegt die Aufgabe zugrunde, ein Handgerät mit einer Tastvorrichtung zur werkzeugbezogenen Einleitung von Schaltvorgängen zu schaffen, welche eine kurze Baulänge des Handgerätes erlaubt und sich zum Abtasten auch wenig ausgeprägter Konturen eignet.The invention has for its object to provide a handheld device with a key device for tool-related initiation of switching operations, which allows a short length of the handheld device and is suitable for scanning even less pronounced contours.

Erfindungsgemäss wird die Aufgabe durch das Haudgerät gemäß Anspruch 1 gelöst.According to the invention, the object is achieved by the Haud device according to claim 1.

Der vom Steuerelement abgewandte Hebelarm führt gegenüber dem mit dem Steuerelement zusammenwirkenden Hebelarm eine gegensinnige Schwenkbewegung aus. Durch entsprechende Wahl der Länge der Hebelarme lässt sich eine Uebersetzung des radialen Ein- bzw Ausrückweges des Steuerelementes bezüglich des abgewandten Hebelarmes erzielen. Die abzutastenden Konturen können so mit derart geringer Ausprägung ausgeführt werden, dass die Festigkeit des Einsteckschaftes nicht beeinträchtigt wird.The lever arm facing away from the control element performs a counter-pivoting movement with respect to the lever arm cooperating with the control element. A corresponding choice of the length of the lever arms enables a translation of the radial engagement or disengagement path of the control element with respect to the lever arm facing away. The contours to be scanned can be carried out with such a small design that the strength of the insert shaft is not impaired.

Je nach Ausbildung der abzutastenden Kontur am Werkzeug können mehrere Steuerelemente und dieselbe Anzahl Schwenkhebel mit den von den Steuerelementen abgewandten Hebelarmen in den Erkennungsbereich des Sensors geschwenkt werden. Beim Einschalten des Handgerätes drehen die Schwenkhebel zusammen mit der Werkzeugaufnahme um die Achse der Werkzeugaufnahme, wobei die von den Steuerelementen abgewandten Hebelarme analog deren Schwenkstellung im Sensor, beispielsweise induktiv, Schaltsignale hervorrufen. Die Schaltsignale können zur Ausführung von Schaltvorgängen verwertet werden. So lässt sich beispielsweise durch die abzutastende Kontur eines eingesetzten Werkzeugs eine bestimmte Drehzahl in Verbindung mit einer bestimmten, auf das Werkzeug einwirkenden Schlagzahl einstellen.Depending on the design of the contour to be scanned on the tool, several control elements and the same number of pivot levers can be pivoted into the detection range of the sensor with the lever arms facing away from the control elements. When the handheld device is switched on, the swivel levers rotate together with the tool holder about the axis of the tool holder, the lever arms facing away from the control elements similarly causing their swivel position in the sensor, for example inductively, to trigger switching signals. The switching signals can be used to carry out switching operations. For example, the contour of an inserted tool to be scanned can be used to set a specific speed in connection with a specific number of impacts acting on the tool.

Vorzugsweise sind mehrere, in Umfangsrichtung der Werkzeugaufnahme versetzt angeordnete Schwenkhebel vorgesehen. Die Versetzung der Schwenkhebel und der diesen zugeordneten Steuerelemente beträgt beispielsweise 90°, dh es sind in gleicher axialer Lage zum Werkzeughalter kreuzweise versetzt zwei Paare einander diametral gegenüberliegender Schwenkhebel und Steuerelemente vorhanden. Diese Anordnung ermöglicht in Verbindung mit kurzer Baulänge des Handgerätes das Einleiten einer Mehrzahl Schaltvorgänge.A plurality of swivel levers, which are offset in the circumferential direction of the tool holder, are preferably provided. The offset of the pivot levers and the control elements assigned to them is, for example, 90 °, ie there are two pairs of diametrically opposed pivot levers and control elements in the same axial position relative to the tool holder. This arrangement, in conjunction with the short length of the hand-held device, enables a plurality of switching operations to be initiated.

Mit Vorteil greifen an den Schwenkhebeln diese mit dem einen Hebelarm gegen die Steuerelemente treibende Federmittel an. Bei den Federmitteln handelt es sich beispielsweise um auf jeden Schwenkhebel einwirkende Druckfedern. Durch die Federmittel werden bei vorhandener, dem jeweiligen Steuerelementzugeordneter Kontur am Einsteckschaft des Werkzeugs die Steuerelemente beim Verriegeln des Einsteckschaftes in der Werkzeugaufnahme gegen das Werkzeug gerückt. Der vom Steuerelement entfernte Hebelarm des jeweiligen Schwenkhebels nimmt so die konturbezogene Schwenkstellung ein.Advantageously, the spring levers act on the pivot levers with the one lever arm against the control elements. The spring means are, for example, compression springs acting on each swivel lever. By the spring means If there is an existing contour assigned to the respective control element on the insert shaft of the tool, the control elements are moved against the tool when the insert shaft is locked in the tool holder. The lever arm of the respective pivot lever, which is removed from the control element, thus assumes the contour-related pivot position.

Zur Erzeugung unterschiedlich langer Schaltsignale und damit zur Erzielung einer Differenzierung der Schaltvorgänge weisen die Schwenkhebel an den von den Steuerelementen abgewandten Hebelarmen untereinander unterschiedlich grosse, in den Erkennungsbereich des Sensors eintretende Wirkflächen auf.In order to generate switching signals of different lengths and thus to achieve a differentiation of the switching processes, the swivel levers on the lever arms facing away from the control elements have mutually different effective areas entering the detection area of the sensor.

Beim Vorhandensein von zwei Paaren von Schwenkhebeln weist zweckmässig das eine Paar die Hebelarme mit grösseren Wirkflächen auf.In the presence of two pairs of pivot levers, one pair expediently has the lever arms with larger active surfaces.

Nach einer Weiterbildung der Erfindung ist der vom Steuerelement abgewandte Hebelarm der Schwenkhebel magnetisch ausgebildet. Dabei ist es möglich, nur diesen Hebelarm magnetisch, vorzugsweise dauermagnetisch, auszubilden oder den Schwenkhebel gesamthaft als Magnet zu gestalten. Bei magnetischen Hebelarmen eignet sich als Sensor ein Hallelement, das den Vorteil günstiger Gestehungskosten hat. Das Hallelement erkennt entsprechend den Stellungen der Schwenkhebel ein Magnetfeld.According to a development of the invention, the lever arm facing away from the control element is of magnetic design. It is possible to design only this lever arm magnetically, preferably permanently magnetically, or to design the pivot lever as a whole as a magnet. With magnetic lever arms, a Hall element is suitable as a sensor, which has the advantage of low production costs. The Hall element recognizes a magnetic field according to the positions of the swivel levers.

Die Schwenkhebel sind vorzugsweise in einer gegenüber dem Werkzeughalter begrenzt verdrehbaren Betätigungshülse geführt. Zweckmässig wirkt die Betätigungshülse mit der Halterung der Werkzeuge im Werkzeughalter dienenden Verriegelungskörpern zusammen, so dass durch Verdrehen der Betätigungshülse in eine definierte Drehstellung die Schwenkhebel in die funktionswirksame Lage zu den Steuerelementen und die Verriegelungskörper in Verriegelungsposition gelangen. So wird eine definierte gegenseitige lagemässige Abhängigkeit der Halterung der Werkzeuge zur Abstützung der Schwenkhebel an den Steuerelementen erreicht. Dies hat nebst einfacher Handhabung hinsichtlich der Steuerung der Schaltvorgänge Vorteile, insbesondere in Verbindung mit Hebelarmen, die unterschiedlich grosse Wirkflächen aufweisen.The pivot levers are preferably guided in an actuating sleeve which can be rotated to a limited extent with respect to the tool holder. The actuating sleeve expediently interacts with the locking bodies serving for holding the tools in the tool holder, so that by turning the actuating sleeve into a defined rotational position, the pivoting levers reach the functionally effective position for the control elements and the locking bodies move into the locking position. A defined mutual positional dependency of the mounting of the tools for supporting the swivel levers on the control elements is achieved. This has easy handling advantages with regard to the control of the switching processes, in particular in connection with lever arms which have different effective areas.

Die Steuerelemente sind vorzugsweise als Kugeln ausgebildet. Deren geometrische Form ist montagemässig und funktionell vorteilhaft.The control elements are preferably designed as balls. Their geometric shape is advantageous in terms of assembly and function.

Nach einem weiteren Vorschlag der Erfindung ist an dem Werkzeug für das Handgerät am Einsteckschaft wenigstens eine Vertiefung für das Steuerelement der Tastvorrichtung vorgesehen. Die zweckmässig als Längsnuten gestalteten Vertiefungen bilden die abzutastende Kontur. Die Tiefe der Längsnuten kann klein bemessen sein, da durch unterschiedlich lange Hebelarme der Schwenkhebel die voran erwähnte ausreichende Uebersetzung, dh Vergrösserung des radialen Ein- und Ausrückweges der Steuerelemente erfolgt. Ist der Einsteckschaft mit mehr als einer Längsnut versehen, so sind die Längsnuten über den Umfang des Einsteckschaftes verteilt angeordnet. Dabei bietet sich die Möglichkeit, die Längsnuten in gleichem oder in unterschiedlichem Winkelabstand zueinander zu plazieren. Unterschiedliche Winkelabstände können als bei der Erzeugung von Schaltsignalen nutzbare Einflussfaktoren verwertet werden.According to a further proposal of the invention, at least one recess for the control element of the feeler device is provided on the tool for the handheld device on the insertion shaft. The depressions expediently designed as longitudinal grooves form the contour to be scanned. The depth of the longitudinal grooves can be small, since the pivoting lever of different lengths has the above-mentioned adequate translation, that is to say enlargement of the radial engagement and disengagement path of the control elements. If the insertion shaft is provided with more than one longitudinal groove, the longitudinal grooves are distributed over the circumference of the insertion shaft. This offers the possibility of placing the longitudinal grooves at the same or a different angular distance from one another. Different angular distances can be used as influencing factors that can be used in the generation of switching signals.

Das Werkzeug kann ferner durch entsprechende Länge der Längsnuten oder durch hintereinander angeordnete Längsnuten, Handgeräten unterschiedlicher Bauart zugeordnet sein. Die Handgeräte unterschiedlicher Bauart unterscheiden sich beispielsweise hinsichtlich der schaltbaren Funktionen oder der Leistung voneinander und weisen auch masslich unterschiedlich ausgebildete Tastvorrichtungen auf. Dadurch kann sichergestellt werden, dass ein bestimmtes Werkzeug nur in für dieses geeigneten Handgeräten einsetzbar ist und hier unterschiedliche Betriebsarten zu steuern vermag. Wird ein solches Werkzeug in ein dafür nicht vorgesehenes Handgerät eingesetzt, so werden keine Schaltsignale erzeugt.The tool can also be assigned to hand tools of different types by corresponding length of the longitudinal grooves or by longitudinal grooves arranged one behind the other. The hand-held devices of different designs differ from one another, for example in terms of the switchable functions or the power, and also have tactile devices of different dimensions. This can ensure that a specific tool can only be used in handheld devices suitable for this and can control different operating modes here. If such a tool is used in a handheld device not intended for this purpose, no switching signals are generated.

Die Erfindung wird nachstehend anhand einer Zeichnung, die ein Ausführungsbeispiel wiedergibt, näher erläutert. Es zeigen:

  • Fig. 1 den Vorderbereich eines Handgerätes mit Tastvorrichtung und eingesetztem Werkzeug, im Längsschnitt;
  • Fig. 2 einen Schnitt durch die Anordnung nach Fig. 1 gemäss Schnittverlauf II-II;
  • Fig. 3 einen Schnitt durch die Anordnung nach Fig. 1 gemäss Schnittverlauf III-III;
  • Fig. 4 ein verkürzt dargestelltes Werkzeug;
  • Fig. 5 einen Schnitt V-V durch das Werkzeug nach Fig. 4; in vergrösserter Darstellung;
  • Fig. 6 bis 8 Schnitte analog Fig. 5, betreffend weitere Ausbildungsformen.
The invention is explained below with reference to a drawing which shows an embodiment. Show it:
  • 1 shows the front area of a hand-held device with a touch device and inserted tool, in longitudinal section;
  • FIG. 2 shows a section through the arrangement according to FIG. 1 according to section line II-II;
  • 3 shows a section through the arrangement according to FIG. 1 according to section III-III;
  • 4 shows a shortened tool;
  • 5 shows a section VV through the tool according to FIG. 4; in an enlarged view;
  • Fig. 6 to 8 sections analogous to FIG. 5, regarding other forms of training.

Bei dem in der Zeichnung mit dem Vorderbereich dargestellten Handgerät handelt es sich um einen Bohrhammer, welcher eingespannten Werkzeugen Drehbewegung und Schläge zu vermitteln vermag. Die an die Werkzeuge abgegebene Schlagenergie geben diese an ein Bearbeitungsgut weiter, wozu eine begrenzte axiale Verschiebbarkeit der Werkzeuge im Bohrhammer erforderlich ist.The hand-held device shown in the drawing with the front area is a hammer drill which is able to convey clamped tools rotational movement and impacts. The impact energy given off to the tools is passed on to a workpiece, which requires a limited axial displacement of the tools in the hammer drill.

Der Bohrhammer gemäss Fig. 1 bis 3 verfügt über eine im wesentlichen hülsenförmige Werkzeugaufnahme 1, an die sich einstückig achsgleich ein Führungszylinder 2 anschliesst. Der Führungszylinder 2 ist von einer Lagerbohrung 2a durchsetzt, in die eine die Werkzeugaufnahme 1 durchragende Führungsbohrung 1a kleineren Durchmessers einmündet. In der Lagerbohrung 2a ist ein Döpper 3 sowie ein diesen beaufschlagender, andeutungsweise erkennbarer Schlagkolben 4 eines an sich bekannten Schlagwerkes verschiebbar angeordnet. Der Döpper 3 überträgt die vom Schlagkolben 4 vermittelten Schläge an ein Werkzeug 5, das mit einem zylindrischen Einsteckschaft 5a in die Führungsbohrung 1a eingesetzt ist und mit dem freien Ende in den Wirkbereich des Döppers 3 ragt.1 to 3 has an essentially sleeve-shaped tool holder 1, to which a guide cylinder 2 is connected in one piece with the same axis. The guide cylinder 2 is penetrated by a bearing bore 2a, into which a guide bore 1a of smaller diameter protruding through the tool holder 1 opens. In the bearing bore 2a, an anvil 3 and a striking piston 4 of a percussion mechanism known per se, which acts upon it and is indicated by an indication, are displaceably arranged. The striker 3 transmits the impacts imparted by the percussion piston 4 to a tool 5 which is inserted into the guide bore 1 a with a cylindrical insertion shaft 5 a and projects with the free end into the effective area of the striker 3.

Zum Drehantrieb der Werkzeugaufnahme 1 sitzt auf dem Führungszylinder 2 drehfest ein Zahnrad 6, das mit einem weiteren Zahnrad 7 einer Vorgelegewelle 8 kämmt. Die Vorgelegewelle 8 trägt ferner ein Kegelrad 9, das mit einem antreibenden Kegelrad 11 in Eingriff steht. Letzteres wird über eine Welle 12 und ein Zahnrad 13, das mit einem andeutungsweise erkennbaren Motorritzel 14 kämmt, angetrieben.A gear 6, which meshes with another gear 7 of a countershaft 8, sits on the guide cylinder 2 so as to rotate the tool holder 1. The countershaft 8 also carries a bevel gear 9 which is in engagement with a driving bevel gear 11. The latter is driven by a shaft 12 and a gear 13, which meshes with a motor pinion 14 which is indicated by an indication.

Zur begrenzt verschiebbaren Halterung und Drehmitnahme des Werkzeugs 5 verfügt der Einsteckschaft 5a über zwei einander diametral gegenüberliegende Mitnahmenuten 5b, 5c. In diese greifen kugelförmige Verriegelungskörper 15, 16 ein, die in der Werkzeugaufnahme 1 radial verschiebbar gelagert sind und von einer Betätigungshülse 17 in die gezeigte Eingriffstellung gebracht werden. Die Betätigungshülse 17 weist hierzu eine an sich bekannte, in Umfangsrichtung sich ändernde Innenkontur 17a auf, an welcher sich die Verriegelungskörper 15, 16 radial abstützen. Durch begrenztes Verdrehen der Betätigungshülse 17 gegenüber der Werkzeugaufnahme 1 kommt es so zum Ein- bzw Ausrücken der Verriegelungskörper 15, 16. Dem Verdrehen der Betätigungshülse 17 dient eine fest auf dieser sitzende Betätigungsmanschette 18. Ein aus vorzugsweise elastischem Material bestehender, frontseitig auf der Werkzeugaufnahme 1 festsitzender Schutzring 19 verhindert das Eindringen von Bohrklein und dergleichen in das Innere des Gerätes.The insert 5a has two diametrically opposed driving grooves 5b, 5c for holding and rotatingly driving the tool 5. Spherical locking bodies 15, 16 engage in these, which are mounted in the tool holder 1 so as to be radially displaceable and are brought into the engagement position shown by an actuating sleeve 17. For this purpose, the actuating sleeve 17 has an inner contour 17a, which is known per se and changes in the circumferential direction, on which the locking bodies 15, 16 are supported radially. By limited rotation of the actuating sleeve 17 relative to the tool holder 1, the locking bodies 15, 16 are engaged or disengaged. The actuating sleeve 17 is used to rotate the actuating sleeve 17. An actuating sleeve 18 that is firmly seated on the front of the tool holder 1 tight protective ring 19 prevents the penetration of cuttings and the like into the interior of the device.

In definierter Drehlage zur Anordnung der Verrieglungskörper 15, 16 sind in der Werkzeugaufnahme 1 ferner Steuerelemente in Form von Kugeln 21, 22, 23, 24 radial verschiebbar und, wie der Fig. 2 entnehmbar, zueinander in gleichmässigem Winkelabstand versetzt gelagert. Den Kugeln 21, 22, 23, 24 können zum Codierungszwecke am Einsteckschaft 5a bis zu vier Vertiefungen in Form von Längsnuten 5d, 5e, 5f, 5g (Fig. 4 bis 8) zugeordnet sein. Entsprechend der Anzahl Kugeln 21, 22, 23, 24 ist eine gleiche Anzahl Schwenkhebel 25, 26, 27, 28 in schlitzförmigen Ausnehmungen 17b, 17c, 17d, 17e der Betätigungshülse 17 geführt. Als Schwenklager dient ein an der Betätigungshülse 17 radial abgestützter, alle Schwenkhebel 25, 26, 27, 28 fassender Federring 29. Ein Hebelarm 25a, 26a, 27a, 28a der Schwenkhebel 25, 26, 27, 28 stützt sich jeweils an einer Kugel 21, 22, 23, 24 ab. Den Kugeln 21, 23 stehen gemäss Ausführung nach Fig. 1 bis 3 zwei werkzeugseitige Längsnuten 5d, 5f gegenüber, so dass diese Kugeln in diese Längsnuten eingerückt werden. Dem Einrücken dienen Druckfedern 31, 32, 33, 34 die auf einen zweiten, von den Kugeln 21, 22, 23, 24 abgewandten Hebelarm 25b, 26b, 27b, 28b einwirken. Dieser Hebelarm 25b, 26b, 27b, 28b führt jeweils eine gegensinnige Schwenkbewegung zum zugehörigen anderen Hebelarm 25a, 26a, 27a, 28a aus. Ein Einrücken der Kugeln 21, 23 in die Längsnuten 5d, 5f hat demnach ein Ausschwenken der von den Kugeln 21, 23 abgewandten Hebelarme 25b, 27b zur Folge.In a defined rotational position for the arrangement of the locking bodies 15, 16, control elements in the form of balls 21, 22, 23, 24 are also radially displaceable in the tool holder 1 and, as can be seen in FIG. 2, are offset from one another at a uniform angular distance. For coding purposes, the balls 21, 22, 23, 24 can have up to four depressions in the form of longitudinal grooves 5d, 5e, 5f, 5g (FIGS 8) can be assigned. Corresponding to the number of balls 21, 22, 23, 24, an equal number of pivot levers 25, 26, 27, 28 is guided in slot-shaped recesses 17b, 17c, 17d, 17e of the actuating sleeve 17. A spring ring 29, which is supported radially on the actuating sleeve 17 and holds all the pivot levers 25, 26, 27, 28, serves as the pivot bearing. A lever arm 25a, 26a, 27a, 28a of the pivot levers 25, 26, 27, 28 is supported in each case on a ball 21, 22, 23, 24 from. According to the embodiment according to FIGS. 1 to 3, the balls 21, 23 are opposite two longitudinal grooves 5d, 5f on the tool side, so that these balls are inserted into these longitudinal grooves. Compression springs 31, 32, 33, 34 serve to engage, and act on a second lever arm 25b, 26b, 27b, 28b facing away from the balls 21, 22, 23, 24. This lever arm 25b, 26b, 27b, 28b in each case executes an opposite pivotal movement to the associated other lever arm 25a, 26a, 27a, 28a. An insertion of the balls 21, 23 into the longitudinal grooves 5d, 5f accordingly results in the lever arms 25b, 27b facing away from the balls 21, 23.

An einem ringförmigen Fortsatz 17f der Betätigungshülse 17 sind in Verlängerung der Ausnehmungen 17b, 17c, 17d, 17e schlitzförmige Durchtrittsöffnungen 17g, 17h, 17i, 17j vorgesehen. Wie die Fig. 1 und 3 zeigen, treten die ausgeschwenkten Hebelarme 25b und 27b in die Durchtrittsoeffnungen 17g und 17i ein. Wie der Fig. 3 ferner zu entnehmen ist, besitzen die von den Kugeln 21, 22, 23, 24 abgewandten Hebelarme 25b, 26b, 27b, 28b paarweise unterschiedliche Breiten, was analog auch für die Durchtrittsöffnungen 17g, 17h, 17i, 17j zutrifft.In an extension of the recesses 17b, 17c, 17d, 17e, slot-shaped passage openings 17g, 17h, 17i, 17j are provided on an annular extension 17f of the actuating sleeve 17. 1 and 3 show, the pivoted lever arms 25b and 27b enter the passage openings 17g and 17i. As can also be seen in FIG. 3, the lever arms 25b, 26b, 27b, 28b facing away from the balls 21, 22, 23, 24 have different widths in pairs, which also applies analogously to the passage openings 17g, 17h, 17i, 17j.

In einem den Fortsatz 17f umschliessenden Teil eines Gehäuses 3b ist im axialen Bereich der Durchtrittsöffnungen 17g, 17h, 17i, 17j ein Sensor 35 in kleinem radialem Abstand zum Fortsatz 17f angeordnet. Unter Drehen der Werkzeugaufnahme 1 samt der Betätigungshülse 17 und den Schwenkhebeln 25, 26, 27, 28 erkennt der Sensor 35 induktiv, ob und wieviel Durchtrittsoeffnungen 17g, 17h, 17i, 17j entsprechend der jeweiligen Schwenkstellung der Schwenkhebel 25, 26, 27, 28 freiliegen und ob es sich bei den in die Durchtrittsöffnungen 17g, 17h, 17i, 17j eingeschwenkten Hebelarmen 25b, 26b, 27b, 28b _ je nach Breite _ um solche mit grosser oder kleiner, dem Sensor 35 zugewandter Wirkfläche handelt. Der Sensor 35 gibt diese Information in Form von Schaltsignalen zur elektrischen Verwertung für einen Schaltvorgang weiter. Es stellt sich sohin automatisch die durch die werkzeugseitige Codierung vorgegebene Betriebsart ein.In a part of a housing 3b which surrounds the extension 17f, a sensor 35 is arranged at a small radial distance from the extension 17f in the axial region of the passage openings 17g, 17h, 17i, 17j. By turning the tool holder 1 together with the actuating sleeve 17 and the pivot levers 25, 26, 27, 28, the sensor 35 inductively recognizes whether and how many passage openings 17g, 17h, 17i, 17j corresponding to the respective pivot position of the pivot levers 25, 26, 27, 28 are exposed and whether the lever arms 25b, 26b, 27b, 28b pivoted into the passage openings 17g, 17h, 17i, 17j _ depending on the width _ are those with a large or small active surface facing the sensor 35. The sensor 35 transmits this information in the form of switching signals for electrical utilization for a switching process. The operating mode specified by the tool-side coding is thus set automatically.

Zum Entfernen des Werkzeugs 5 aus der Werkzeugaufnahme 1 wird über die Betätigungsmanschette 18 die Betätigungshülse 17 begrenzt verdreht. Dadurch können einerseits die Verriegelungskörper 15, 16 in an sich bekannte Ausweichnischen der Innenkontur 17a radial austreten; andererseits gelangen die Schwenkhebel 25, 26, 27, 28 aus der radialen Projektion zu den Kugeln 21, 22, 23, 24, wodurch diese aus dem Bereich der Ausnehmungen 17b, 17c, 17d, 17e in den Bereich von Vertiefungen 17k, 17l, 17m, 17n (Fig. 2) radial entweichen können.To remove the tool 5 from the tool holder 1, the actuating sleeve 17 is rotated to a limited extent via the actuating sleeve 18. As a result, on the one hand the locking bodies 15, 16 can emerge radially in known alternative niches of the inner contour 17a; on the other hand, the pivot levers 25, 26, 27, 28 reach the balls 21, 22, 23, 24 from the radial projection, as a result of which they move from the region of the recesses 17b, 17c, 17d, 17e into the region of recesses 17k, 17l, 17m , 17n (Fig. 2) can escape radially.

In Fig. 4 ist das Werkzeug 5 in einer gegenüber den Fig. 1 und 2 hinsichtlich der Längsnuten abweichenden Ausbildungsform dargestellt. Hier ist lediglich die Längsnut 5e vorhanden, wie dies auch die Fig. 5 verdeutlicht. In der Ausbildungsform nach Fig. 6 sind zwei einander diametral gegenüberliegende Längsnuten 5d, 5e, in der Fig. 7 drei Längsnuten 5d, 5e, 5f in ungleichem Winkelabstand und in Fig. 8 vier Längsnuten 5d, 5e, 5f, 5g in gleichem Winkelabstand zueinander angeordnet. Auch weitere Anordnungen von Längsnuten sind möglich und zur Erzielung unterschiedlicher Schaltsignale nutzbar.In FIG. 4 the tool 5 is shown in an embodiment which differs from FIGS. 1 and 2 with regard to the longitudinal grooves. Only the longitudinal groove 5e is present here, as is also illustrated in FIG. 5. 6 are two diametrically opposed longitudinal grooves 5d, 5e, in FIG. 7 three longitudinal grooves 5d, 5e, 5f at an unequal angular distance and in FIG. 8 four longitudinal grooves 5d, 5e, 5f, 5g at the same angular distance from one another arranged. Further arrangements of longitudinal grooves are also possible and can be used to achieve different switching signals.

Claims (8)

1. Hand tool comprising a tool holder (1) for tools (5) and a probing device for detecting the contours of the tools (5) which co-ats with a sensor (35) of the hand tool for the purpose of initialing a switching process, in which respect the probing device comprises at least one control element (21, 22, 23, 24) which is insertable substantially transversely to the tool axis into a guide bore (1a) of the tool holder (1), and one probing member for the control element (21, 22, 23, 24), whereby the probing member is arranged to be a two-armed pivot lever (25, 26, 27, 28) with its pivot axis running transversely to the tool axis, and whereby, with one of the lever arms (25a, 26a, 27a, 28a) supported against the control element (21, 22, 23, 24), the other lever arm (25b, 26b, 27b, 28b) facing away from the control element co-acts with the sensor (35), with the radial gap relative to the sensor (35) being smaller with the control element (21, 22, 23, 24) inserted into the guide bore (1a) than with the control element (21, 22, 23, 24) removed from the guide bore (1a).
2. Hand tool according to claim 1, characterised in the provision of several pivot levers (25, 26, 27, 28), which are offset in the peripheral direction of the tool holder (1).
3. Hand tool according to claim 1 or 2, characterised in that spring means (31, 32, 33, 34) engage the pivot levers (25, 26, 27, 28) which they drive by means of the one lever arm (25a, 26a, 27a, 28a) towards the control elements (21, 22, 23, 24).
4. Hand tool according to one of claims 1 to 3, characterised in that the pivot levers (25, 26, 27, 28) have at the lever arms (25b, 26b, 27b, 28b), which are facing away from the control elements (21, 22, 23, 24), effective surfaces of different sizes relative to each other which enter into the detection area of the sensor (35).
5. Hand tool according to one of claims 1 to 4, characterised in that the lever arm (25b, 26b, 27b, 28b), which faces away from the control element (21, 22, 23, 24), of the pivot lever (25, 26, 27, 28) is constructed to be magnetic.
6. Hand tool according to one of claims 1 to 5, characterised in that the pivot levers (25, 26, 27, 28) are guided in an operating sleeve (17) the rotation of which is limited relative to the tool holder (1).
7. Hand tool according to one of claims 1 to 6, characterised in that the control elements are constructed to be balls (21, 22, 23, 24).
8. Hand tool according to one of claims 1 to 7 with a tool, characterised in that at least one recess (5d, 5e, 5f, 5g) for the control element (21, 22, 23, 24) of the probing means is provided at the input shaft (5a) of the tool.
EP88810405A 1987-06-20 1988-06-14 Hand tool Expired - Lifetime EP0297041B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810405T ATE63712T1 (en) 1987-06-20 1988-06-14 HANDHELD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3720512 1987-06-20
DE19873720512 DE3720512A1 (en) 1987-06-20 1987-06-20 HAND DEVICE

Publications (3)

Publication Number Publication Date
EP0297041A2 EP0297041A2 (en) 1988-12-28
EP0297041A3 EP0297041A3 (en) 1989-05-03
EP0297041B1 true EP0297041B1 (en) 1991-05-22

Family

ID=6330025

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EP88810405A Expired - Lifetime EP0297041B1 (en) 1987-06-20 1988-06-14 Hand tool

Country Status (12)

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US (1) US4830549A (en)
EP (1) EP0297041B1 (en)
JP (1) JPS6416383A (en)
AT (1) ATE63712T1 (en)
AU (1) AU593449B2 (en)
CA (1) CA1285834C (en)
DE (2) DE3720512A1 (en)
DK (1) DK335088A (en)
ES (1) ES2022706B3 (en)
FI (1) FI882826A (en)
MX (1) MX168864B (en)
ZA (1) ZA884316B (en)

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DE102007056531A1 (en) 2007-11-23 2009-05-28 Hilti Aktiengesellschaft Hand tool machine with impact tool holder and associated tool
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ES2026199T3 (en) * 1986-12-17 1992-04-16 Hilti Aktiengesellschaft MANUAL DEVICE.

Also Published As

Publication number Publication date
ATE63712T1 (en) 1991-06-15
CA1285834C (en) 1991-07-09
DK335088A (en) 1988-12-21
ES2022706B3 (en) 1991-12-01
EP0297041A3 (en) 1989-05-03
FI882826A0 (en) 1988-06-14
FI882826A (en) 1988-12-21
DE3720512A1 (en) 1988-12-29
EP0297041A2 (en) 1988-12-28
JPS6416383A (en) 1989-01-19
ZA884316B (en) 1989-03-29
US4830549A (en) 1989-05-16
AU593449B2 (en) 1990-02-08
DE3862898D1 (en) 1991-06-27
DK335088D0 (en) 1988-06-17
AU1811288A (en) 1988-12-22
MX168864B (en) 1993-06-11

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