EP0463416B1 - Electrical hammerdrill - Google Patents

Electrical hammerdrill Download PDF

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Publication number
EP0463416B1
EP0463416B1 EP91109155A EP91109155A EP0463416B1 EP 0463416 B1 EP0463416 B1 EP 0463416B1 EP 91109155 A EP91109155 A EP 91109155A EP 91109155 A EP91109155 A EP 91109155A EP 0463416 B1 EP0463416 B1 EP 0463416B1
Authority
EP
European Patent Office
Prior art keywords
drilling machine
machine according
shift lever
spindle
impact drilling
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
EP91109155A
Other languages
German (de)
French (fr)
Other versions
EP0463416A1 (en
Inventor
Joerg Faelchle
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0463416A1 publication Critical patent/EP0463416A1/en
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Publication of EP0463416B1 publication Critical patent/EP0463416B1/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
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0038—Tools having a rotation-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/005—Adjustable tool components; Adjustable parameters
    • B25D2250/011—Bits, e.g. adjusting bits by setting in the desired angular position

Definitions

  • the impact drill according to the invention with the characterizing features of claim 1 has the advantage that it can be switched over to the operating modes rotary drilling, impact drilling and chiseling with and without spindle lock by user-friendly and easy-to-use switching elements.
  • a locking pin for the spindle lock that works together with the shift lever for switching the operating mode is particularly advantageous. This is under spring force and automatically returns to its rest position before switching on the rotary drive. Resilient switching elements enable the speed to be switched even during operation.
  • the rotatable arrangement of gearwheels on the spindle which can be switched by means of an axially displaceable coupling ring, enables the switching elements for the operating mode switchover and the spindle lock to be coupled in a particularly simple manner.
  • Figure 1 shows a longitudinal section through an impact drill
  • Figure 2 shows a cross section through the switching elements.
  • An impact drill with an electric drive motor (not shown further) has a housing 2, from which a tool holder 3 protrudes at the front.
  • the tool holder 3 is connected to a rotationally driven spindle 4, within which a pneumatic hammer mechanism 5 is accommodated. Impacts of the striking mechanism 5 generated in the axial direction of the spindle 4 are transmitted to a tool, not shown, which is inserted into the tool holder 3.
  • the striking mechanism 5 is driven by a wobble mechanism 6 known per se from rotary hammers, which has a rotary drive element 7 and a piston 8 driven to and fro.
  • the rotary drive member 7 carries part of a clutch 10, the other part of which is arranged on a switching sleeve 11.
  • the shift sleeve 11 is rotatably driven by an intermediate shaft 12 driven by a motor pinion 9 and is axially displaceable thereon.
  • the switching sleeve 11 carries a collar 13 on which an annular thrust bearing 14, which is pushed over the spindle 4, bears.
  • the intermediate shaft 12 carries two spaced-apart, firmly connected gears 16 and 17 of different diameters.
  • the gears 16 and 17 are in constant engagement with two rotatably but axially fixed gears 18 and 19 on the spindle 4.
  • the spindle 4 rotatably but axially displaceably carries a coupling ring 20, which has a coupling toothing 21 facing each of the gears.
  • the clutch teeth 21 engage in counter teeth 22 and 23 on the gears 18 and 19.
  • the coupling ring 20 has a locking toothing 24, into which a locking pin 25 which is seated in a rotationally fixed manner in the housing 2 can be latched.
  • a two-legged shift fork 27 acts on the clutch ring 20 and is pressed by a compression spring 28 against a first annularly closed control cam 30 of a shift lever 31.
  • One leg 32 of the shift fork 27 is slidably mounted relative to the other and is urged against the coupling ring 20 by a spring 33.
  • the shift lever 31 has a handle 35 protruding from the housing 2 and can be rotated about an axis 36 running perpendicular to the housing plane.
  • the shift lever 31 has, as the first control cam 30, an annular groove, the bottom of which describes approximately a semicircular line.
  • the bottom of the groove has a large distance measured on two of four sides from the axis 36, so that the coupling ring 20 couples into the gear 19 for slow gear, on one side a medium-sized distance, so that neither of the two gears 18, 19 with the spindle 4 are coupled and on the fourth side a small distance from the axis 36, so that the gear 18 is coupled to the coupling ring 20.
  • the control curve 30 is designed such that when turning from the chisel position shown in FIG. 1 without a rotary drive, the shift fork 27 initially does not move, so that a holding extension 39 attached laterally to the locking pin 25 and held down by a nose 38 on the shift lever 31 is released.
  • the control curve 30 has a flattened curve section 40.
  • the shift lever 31 has a second closed control cam, which is designed as a protruding plate 42 with two narrow and two long sides.
  • the control cam or plate 32 works together with the thrust bearing 14.
  • the long sides of the plate 42 lie parallel to the thrust bearing 14, so that the clutch 10 is engaged. If the narrow sides of the plate 42 are parallel to the thrust bearing 14, the clutch 10 disengages due to the force of a clutch spring 43 and the rotary drive member 7 stands still.
  • the shift lever 31 and the locking pin 25 can be selected from five different modes of operation of the impact drill.
  • Figure 1 and 2 pure hitting with spindle lock is shown. If the locking pin 25 is not pressed in, then with the same position of the shift lever 31, a striking operation takes place with a freely rotatable spindle 4.
  • the shift lever 31 By turning the shift lever 31 clockwise by 90 degrees, the locking pin 25 jumps out from under the nose 38, then the shift fork is opened in the direction the tool holder 3 moved so that the coupling teeth 21 engages in the counter teeth 23 of the gear 19.
  • the thrust bearing 14 is displaced in the direction of the tool holder 3 via the control cam 42, so that the striking mechanism 5 disengages. In this position, rotary drilling is possible at a slow speed.
  • a further rotation of the shift lever 31 by 90 degrees in a clockwise direction results in the hammer mechanism 5 being switched on, which means that hammer drilling is now possible at slow speed.
  • the striking mechanism 5 is switched off again and the shift fork is pushed to the left by the force of the compression spring 28 away from the tool holder 3, so that the coupling toothing 21 in the counter toothing 22 of the gearwheel 18 snaps into place.
  • rotary drilling is possible at a fast turning speed.
  • hammer drilling with a fast rotation speed cannot be selected, as this could overload the motor.
  • the shift lever 31 is not firmly coupled to the shift fork 27.
  • the springs 28 and 33 ensure when the gears 18 and 19 are switched on that the shift lever 31 can also be turned into its desired position when the toothings 21/22 and 21/23 are tooth-to-tooth.
  • the sprung leg 32 or the sprung shift fork 27 itself only push the clutch ring 20 sideways when the clutch teeth 21 can engage in the respective counter teeth 22 or 23.
  • the shift lever 31 and the control cams 30, 42 are designed so that the shift lever can be rotated as far as desired in both directions of rotation, that is to say the desired mode of operation can be selected in the shortest possible way.
  • the invention is not limited to the exemplary embodiment shown.
  • other two-speed transmission types can also be used, which can also be shifted by a longitudinal displacement of a shift element controlled by the control cam of a shift lever.
  • the invention is particularly applicable to pneumatic rotary hammers.

Description

Die Erfindung geht aus von einer Schlagbohrmaschine nach der Gattung des Anspruchs 1. Aus dem DE-PS 19 57 235 (= US-PS 36 80 642) ist bereits eine solche Schlagbohrmaschine bekannt, die sich zum Schlagbohren und zum Drehbohren mit jeweils zwei Spindeldrehzahlen eignet. Der Drehantrieb ist bei dieser Maschine nicht abschaltbar, sodaß reines Schlagen bzw. Meißeln nicht möglich ist.The invention is based on an impact drill according to the preamble of claim 1. From DE-PS 19 57 235 (= US-PS 36 80 642) such an impact drill is already known which is suitable for impact drilling and for rotary drilling with two spindle speeds in each case . The rotary drive cannot be switched off on this machine, so that pure hitting or chiseling is not possible.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Schlagbohrmaschine mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß sie sich durch bedienungsfreundliche und einfach zu handhabende Schaltelemente in die Betriebsweisen Drehbohren, Schlagbohren sowie Meißeln mit und ohne Spindelarretierung umschalten läßt.The impact drill according to the invention with the characterizing features of claim 1 has the advantage that it can be switched over to the operating modes rotary drilling, impact drilling and chiseling with and without spindle lock by user-friendly and easy-to-use switching elements.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Schlagbohrmaschine möglich. Besonders vorteilhaft ist ein mit dem Schalthebel zum Schalten der Betriebsweise zusammenarbeitender Sperrstift für die Spindelarretierung. Dieser steht unter Federkraft und kehrt vor Zuschalten des Drehantriebs selbstätig in seine Ruhestellung zurück. Federnde Schaltglieder ermöglichen ein Umschalten der Drehzahl auch während des Betriebs.The measures listed in the dependent claims allow advantageous developments and improvements of the impact drill specified in claim 1. A locking pin for the spindle lock that works together with the shift lever for switching the operating mode is particularly advantageous. This is under spring force and automatically returns to its rest position before switching on the rotary drive. Resilient switching elements enable the speed to be switched even during operation.

Die drehbare Anordnung von Getriebezahnrädern auf der Spindel, die mittels eines axial verschieblichen Kupplungsrings schaltbar sind, ermöglicht auf besonders einfache Weise eine zweckmäßige Koppelung der Schaltelemente für die Betriebsweisenumschaltung und die Spindelarretierung.The rotatable arrangement of gearwheels on the spindle, which can be switched by means of an axially displaceable coupling ring, enables the switching elements for the operating mode switchover and the spindle lock to be coupled in a particularly simple manner.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Figur 1 zeigt einen Längsschnitt durch eine Schlagbohrmaschine, Figur 2 zeigt einen Querschnitt durch die Schaltelemente.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. Figure 1 shows a longitudinal section through an impact drill, Figure 2 shows a cross section through the switching elements.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Eine Schlagbohrmaschine mit nicht weiter gezeigtem elektrischem Antriebsmotor weist ein Gehäuse 2 auf, aus dem vorne ein Werkzeughalter 3 herausragt. Der Werkzeughalter 3 ist mit einer drehend angetriebenen Spindel 4 verbunden, innerhalb derer ein pneumatisches Schlagwerk 5 untergebracht ist. In Axialrichtung der Spindel 4 erzeugte Schläge des Schlagwerks 5 werden auf ein in den Werkzeughalter 3 eingesetztes nicht weiter gezeigtes Werkzeug übertragen. Das Schlagwerk 5 ist durch ein an sich von Bohrhämmern her bekanntes Taumelgetriebe 6 angetrieben, das ein Drehantriebsglied 7 und einen hin- und hergehend angetriebenen Kolben 8 aufweist. Das Drehantriebsglied 7 trägt einen Teil einer Kupplung 10, deren anderer Teil an einer Schalthülse 11 angeordnet ist. Die Schalthülse 11 wird von einer von einem Motorritzel 9 angetriebenen Zwischenwelle 12 drehend angetrieben und ist auf dieser axial verschieblich. Die Schalthülse 11 trägt einen Bund 13, an dem ein über die Spindel 4 aufgeschobenes ringförmiges Drucklager 14 anliegt. Die Zwischenwelle 12 trägt zwei voneinander beabstandete, fest mit ihr verbundene Zahnräder 16 und 17 von unterschiedlichem Durchmesser. Die Zahnräder 16 und 17 stehen in ständigem Eingriff mit zwei drehbar aber axial fest auf der Spindel 4 gelagerten Zahnrädern 18 und 19. Zwischen den Zahnrädern 18 und 19 trägt die Spindel 4 drehfest aber axial verschieblich einen Kupplungsring 20, der jedem der Zahnräder zugewandt jeweils eine Kupplungsverzahnung 21 aufweist. Die Kupplungsverzahnungen 21 greifen in Gegenverzahnungen 22 und 23 an den Zahnrädern 18 und 19 ein. In seinem Mittelteil trägt der Kupplungsring 20 eine Arretierverzahnnung 24, in die ein drehfest im Gehäuse 2 sitzender Sperrstift 25 einrastbar ist.An impact drill with an electric drive motor (not shown further) has a housing 2, from which a tool holder 3 protrudes at the front. The tool holder 3 is connected to a rotationally driven spindle 4, within which a pneumatic hammer mechanism 5 is accommodated. Impacts of the striking mechanism 5 generated in the axial direction of the spindle 4 are transmitted to a tool, not shown, which is inserted into the tool holder 3. The striking mechanism 5 is driven by a wobble mechanism 6 known per se from rotary hammers, which has a rotary drive element 7 and a piston 8 driven to and fro. The rotary drive member 7 carries part of a clutch 10, the other part of which is arranged on a switching sleeve 11. The shift sleeve 11 is rotatably driven by an intermediate shaft 12 driven by a motor pinion 9 and is axially displaceable thereon. The switching sleeve 11 carries a collar 13 on which an annular thrust bearing 14, which is pushed over the spindle 4, bears. The intermediate shaft 12 carries two spaced-apart, firmly connected gears 16 and 17 of different diameters. The gears 16 and 17 are in constant engagement with two rotatably but axially fixed gears 18 and 19 on the spindle 4. Between the gears 18 and 19, the spindle 4 rotatably but axially displaceably carries a coupling ring 20, which has a coupling toothing 21 facing each of the gears. The clutch teeth 21 engage in counter teeth 22 and 23 on the gears 18 and 19. In its central part, the coupling ring 20 has a locking toothing 24, into which a locking pin 25 which is seated in a rotationally fixed manner in the housing 2 can be latched.

An dem Kupplungsring 20 greift eine zweischenkelige Schaltgabel 27 an, die von einer Druckfeder 28 gegen eine erste ringförmig geschlossene Steuerkurve 30 eines Schalthebels 31 angedrückt wird. Ein Schenkel 32 der Schaltgabel 27 ist gegenüber dem anderen verschieblich gelagert und wird von einer Feder 33 gegen den Kupplungsring 20 gedrängt. Der Schalthebel 31 hat eine aus dem Gehäuse 2 herausragende Handhabe 35 und ist um eine senkrecht zu der Gehäuseebene verlaufende Achse 36 drehbar. Innerhalb des Gehäuses hat der Schalthebel 31 als erste Steuerkurve 30 eine Ringnut, deren Grund etwa eine halbkreisförmige Linie beschreibt. Der Nutgrund hat nach zwei von vier Seiten von der Achse 36 her gemessen einen weiten Abstand, so daß der Kupplungsring 20 in das Zahnrad 19 für den langsamen Gang einkuppelt, nach einer Seite einen mittelgroßen Abstand, so daß keines der beiden Zahnräder 18, 19 mit der Spindel 4 gekoppelt sind und nach der vierten Seite einen geringen Abstand zur Achse 36, so daß das Zahnrad 18 mit dem Kupplungsring 20 gekuppelt ist. Die Steuerkurve 30 ist so ausgebildet, daß beim Drehen aus der in Figur 1 gezeigten Meißelstellung ohne Drehantrieb die Schaltgabel 27 zunächst keinen Verschiebeweg ausführt, so daß ein an dem Sperrstift 25 seitlich angebrachter, von einer Nase 38 am Schalthebel 31 niedergehaltener Haltefortsatz 39 freigegeben wird. Dazu weist die Steuerkurve 30 einen abgeflachten Kurvenabschnitt 40 auf. Axial weiter innen hat der Schalthebel 31 noch eine zweite geschlossene Steuerkurve, die als hervorstehende Platte 42 mit zwei schmalen und zwei langen Seiten ausgebildet ist. Die Steuerkurve beziehungsweise Platte 32 arbeitet zusammen mit dem Drucklager 14. In Figur 1 liegen die langen Seiten der Platte 42 parallel zum Drucklager 14, so daß die Kupplung 10 eingekuppelt ist. Stehen die schmalen Seiten der Platte 42 parallel zum Drucklager 14, so kuppelt die Kupplung 10 infolge der Kraft einer Kupplungsfeder 43 aus und das Drehantriebsglied 7 steht still.A two-legged shift fork 27 acts on the clutch ring 20 and is pressed by a compression spring 28 against a first annularly closed control cam 30 of a shift lever 31. One leg 32 of the shift fork 27 is slidably mounted relative to the other and is urged against the coupling ring 20 by a spring 33. The shift lever 31 has a handle 35 protruding from the housing 2 and can be rotated about an axis 36 running perpendicular to the housing plane. Within the housing, the shift lever 31 has, as the first control cam 30, an annular groove, the bottom of which describes approximately a semicircular line. The bottom of the groove has a large distance measured on two of four sides from the axis 36, so that the coupling ring 20 couples into the gear 19 for slow gear, on one side a medium-sized distance, so that neither of the two gears 18, 19 with the spindle 4 are coupled and on the fourth side a small distance from the axis 36, so that the gear 18 is coupled to the coupling ring 20. The control curve 30 is designed such that when turning from the chisel position shown in FIG. 1 without a rotary drive, the shift fork 27 initially does not move, so that a holding extension 39 attached laterally to the locking pin 25 and held down by a nose 38 on the shift lever 31 is released. For this purpose, the control curve 30 has a flattened curve section 40. Axial further inside, the shift lever 31 has a second closed control cam, which is designed as a protruding plate 42 with two narrow and two long sides. The control cam or plate 32 works together with the thrust bearing 14. In FIG. 1, the long sides of the plate 42 lie parallel to the thrust bearing 14, so that the clutch 10 is engaged. If the narrow sides of the plate 42 are parallel to the thrust bearing 14, the clutch 10 disengages due to the force of a clutch spring 43 and the rotary drive member 7 stands still.

Über den Schalthebel 31 und den Sperrstift 25 kann unter fünf verschiedenen Betriebsweisen der Schlagbohrmaschine gewählt werden. In Figur 1 und 2 ist reines Schlagen mit Spindelarretierung gezeigt. Wird der Sperrstift 25 nicht eingedrückt, so erfolgt bei gleicher Stellung des Schalthebels 31 ein Schlagbetrieb mit freidrehbarer Spindel 4. Durch Weiterdrehen des Schalthebels 31 im Uhrzeigersinn um 90 Grad springt zunächst der Sperrstift 25 unter der Nase 38 hervor, danach wird die Schaltgabel in Richtung auf den Werkzeughalter 3 verschoben, so daß die Kupplungsverzahnung 21 in die Gegenverzahnung 23 des Zahnrades 19 eingreift. Gleichzeitig wird über die Steuerkurve 42 das Drucklager 14 in Richtung Werkzeughalter 3 verschoben, so daß das Schlagwerk 5 auskuppelt. In dieser Stellung ist Drehbohren mit langsamer Drehgeschwindigkeit möglich. Ein weiteres Verdrehen des Schalthebels 31 um 90 Grad im Uhrzeigersinn führt zum Zuschalten des Schlagwerks 5 womit nun Schlagbohren mit langsamer Geschwindigkeit möglich ist. In der vierten Stellung, die durch weiteres Drehen um 90 Grad erreicht wird, wird das Schlagwerk 5 wiederum abgeschaltet und die Schaltgabel wird durch die Kraft der Druckfeder 28 vom Werkzeughalter 3 weg nach links gedrängt, so daß die Kupplungsverzahnung 21 in die Gegenverzahnung 22 des Zahnrades 18 einrastet. In dieser Stellung ist Drehbohren mit schneller Drehgeschwindigkeit möglich. Schlagbohren mit schneller Drehgeschwindigkeit ist vorsorglich nicht anwählbar, da hierbei eine Überlastung des Motors auftreten könnte.About the shift lever 31 and the locking pin 25 can be selected from five different modes of operation of the impact drill. In Figure 1 and 2 pure hitting with spindle lock is shown. If the locking pin 25 is not pressed in, then with the same position of the shift lever 31, a striking operation takes place with a freely rotatable spindle 4. By turning the shift lever 31 clockwise by 90 degrees, the locking pin 25 jumps out from under the nose 38, then the shift fork is opened in the direction the tool holder 3 moved so that the coupling teeth 21 engages in the counter teeth 23 of the gear 19. At the same time, the thrust bearing 14 is displaced in the direction of the tool holder 3 via the control cam 42, so that the striking mechanism 5 disengages. In this position, rotary drilling is possible at a slow speed. A further rotation of the shift lever 31 by 90 degrees in a clockwise direction results in the hammer mechanism 5 being switched on, which means that hammer drilling is now possible at slow speed. In the fourth position, which is achieved by further rotation by 90 degrees, the striking mechanism 5 is switched off again and the shift fork is pushed to the left by the force of the compression spring 28 away from the tool holder 3, so that the coupling toothing 21 in the counter toothing 22 of the gearwheel 18 snaps into place. In this position, rotary drilling is possible at a fast turning speed. As a precaution, hammer drilling with a fast rotation speed cannot be selected, as this could overload the motor.

Der Schalthebel 31 ist mit der Schaltgabel 27 nicht fest gekoppelt. Die Federn 28 und 33 sorgen beim Zuschalten der Zahnräder 18 bzw. 19 dafür, daß der Schalthebel 31 auch dann in seine gewünschte Stellung gedreht werden kann, wenn die Verzahnungen 21/22 bzw. 21/23 Zahn auf Zahn stehen. Der abgefederte Schenkel 32 bzw. die abgefederte Schaltgabel 27 selbst drängen den Kupplungsring 20 erst dann seitwärts, wenn die Kupplungsverzahnung 21 in die jeweilige Gegenverzahnung 22 bzw. 23 eingreifen kann. Der Schalthebel 31 und die Steuerkurven 30, 42 sind so gestaltet, daß sich der Schalthebel in beiden Drehrichtungen beliebig weit drehen läßt, also die gewünschte Betriebsweise jeweils auf dem kürzesten Weg angewählt werden kann.The shift lever 31 is not firmly coupled to the shift fork 27. The springs 28 and 33 ensure when the gears 18 and 19 are switched on that the shift lever 31 can also be turned into its desired position when the toothings 21/22 and 21/23 are tooth-to-tooth. The sprung leg 32 or the sprung shift fork 27 itself only push the clutch ring 20 sideways when the clutch teeth 21 can engage in the respective counter teeth 22 or 23. The shift lever 31 and the control cams 30, 42 are designed so that the shift lever can be rotated as far as desired in both directions of rotation, that is to say the desired mode of operation can be selected in the shortest possible way.

Die Erfindung beschränkt sich nicht auf das gezeigte Ausführungsbeispiel. Insbesondere können auch andere Zweiganggetriebe-Bauarten verwendet werden, die ebenfalls durch eine Längsverschiebung eines von der Steuerkurve eines Schalthebels gesteuerten Schaltgliedes schaltbar sind. Die Erfindung ist insbesondere auch auf pneumatische Bohrhämmer anwendbar.The invention is not limited to the exemplary embodiment shown. In particular, other two-speed transmission types can also be used, which can also be shifted by a longitudinal displacement of a shift element controlled by the control cam of a shift lever. The invention is particularly applicable to pneumatic rotary hammers.

Claims (9)

  1. Electric impact drilling machine or drilling hammer having a shift transmission which allows at least two different rotation speeds for the spindle (4) and having a disconnectable striking mechanism (5), both the shift transmission and the striking mechanism (5) being switched by a single shift lever (31) exhibiting two control cams (30, 42), characterised in that the rotary drive is connected and disconnected by means of one of the control cams (30), which acts upon a movable clutch ring (20) between the spindle (4) and the intermediate shaft (12) driven by the motor and in that the spindle (4) can be detained in a rotationally secure manner by the selective actuation of a locking pin (25) interacting with the clutch ring.
  2. Impact drilling machine according to Claim 1, characterised in that the locking pin (25) interacts with a boss (38) on the shift lever (31).
  3. Impact drilling machine according to Claim 1 or 2, characterised in that the locking pin (25), upon the connection of the rotary drive, returns automatically out of its locking position into its rest position releasing the spindle (4).
  4. Impact drilling machine according to one of the preceding claims, characterised in that the shift lever exhibits two gearwheels (18, 19), mounted rotatably on the spindle (4), and an intermediate clutch ring (20), which is connected in a rotationally secure but axially displaceable manner to the spindle (4).
  5. Impact drilling machine according to Claim 1 or 4, characterised in that the shift transmission contains resiliently mounted switching members (27, 32) between the shift lever (31) and the clutch ring (20) to be switched.
  6. Impact drilling machine according to one of the preceding claims, characterised in that the striking mechanism (5) is a pneumatic hammer striking mechanism.
  7. Impact drilling machine according to one of the preceding claims, characterised in that the shift lever (31) exhibits a first groove-like control cam (30) and a second plate-shaped control cam (42).
  8. Impact drilling machine according to Claim 7, characterised in that the first control cam (30), in order to switch over the rotation speed, interacts with a shift fork (27) and exhibits a curved section (40), which, upon rotation of the shift lever (31), gives rise to an axial idle path of the shift fork (27), whilst the locking pin (25) springs out of its locking position.
  9. Impact drilling machine according to Claim 7, characterised in that the second control cam (42) acts upon a clutch (10) on a rotary drive member (7) of the striking mechanism (5) and alternately connects and disconnects the latter upon the rotation of the shift lever (31).
EP91109155A 1990-06-26 1991-06-05 Electrical hammerdrill Expired - Lifetime EP0463416B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020269A DE4020269A1 (en) 1990-06-26 1990-06-26 ELECTRIC DRILLING MACHINE
DE4020269 1990-06-26

Publications (2)

Publication Number Publication Date
EP0463416A1 EP0463416A1 (en) 1992-01-02
EP0463416B1 true EP0463416B1 (en) 1993-09-29

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EP91109155A Expired - Lifetime EP0463416B1 (en) 1990-06-26 1991-06-05 Electrical hammerdrill

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EP (1) EP0463416B1 (en)
DE (2) DE4020269A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003523835A (en) * 2000-02-19 2003-08-12 シンテイラ アクチエンゲゼルシヤフト Tool machinery
DE19528924B4 (en) * 1995-08-05 2005-01-27 Scintilla Ag Electric hammer drill
US7717191B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode hammer drill with shift lock
US7717192B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode drill with mode collar
US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
US7762349B2 (en) 2007-11-21 2010-07-27 Black & Decker Inc. Multi-speed drill and transmission with low gear only clutch
US7770660B2 (en) 2007-11-21 2010-08-10 Black & Decker Inc. Mid-handle drill construction and assembly process
US7798245B2 (en) 2007-11-21 2010-09-21 Black & Decker Inc. Multi-mode drill with an electronic switching arrangement
US7854274B2 (en) 2007-11-21 2010-12-21 Black & Decker Inc. Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing
CN102626913A (en) * 2011-02-01 2012-08-08 株式会社牧田 Power tool
CN102632481A (en) * 2011-02-13 2012-08-15 南京德朔实业有限公司 Electric hammer
CN102649266A (en) * 2012-04-16 2012-08-29 制尚电器(浙江)有限公司 Multifunctional double-speed electric hammer
CN102873669A (en) * 2012-10-15 2013-01-16 浙江恒友机电有限公司 One-button multifunctional switching structure

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DE19545260A1 (en) * 1995-11-24 1997-05-28 Black & Decker Inc Hammer drill
DE10240361A1 (en) * 2002-09-02 2004-03-11 Hilti Ag Rotating and striking electric hand machine tool
JP5055749B2 (en) * 2005-11-16 2012-10-24 マックス株式会社 Hammer drill
DE102011103104B4 (en) 2011-05-25 2019-03-28 Sew-Eurodrive Gmbh & Co Kg Clutch for a transmission, transmission with a clutch, trolley for a monorail with a gearbox
JP6325360B2 (en) * 2014-06-12 2018-05-16 株式会社マキタ Impact tool

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528924B4 (en) * 1995-08-05 2005-01-27 Scintilla Ag Electric hammer drill
JP2003523835A (en) * 2000-02-19 2003-08-12 シンテイラ アクチエンゲゼルシヤフト Tool machinery
JP4933713B2 (en) * 2000-02-19 2012-05-16 シンテイラ アクチエンゲゼルシヤフト Tool machine
US7854274B2 (en) 2007-11-21 2010-12-21 Black & Decker Inc. Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing
US8109343B2 (en) 2007-11-21 2012-02-07 Black & Decker Inc. Multi-mode drill with mode collar
US7762349B2 (en) 2007-11-21 2010-07-27 Black & Decker Inc. Multi-speed drill and transmission with low gear only clutch
US7770660B2 (en) 2007-11-21 2010-08-10 Black & Decker Inc. Mid-handle drill construction and assembly process
US7798245B2 (en) 2007-11-21 2010-09-21 Black & Decker Inc. Multi-mode drill with an electronic switching arrangement
US7717192B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode drill with mode collar
US7987920B2 (en) 2007-11-21 2011-08-02 Black & Decker Inc. Multi-mode drill with mode collar
US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
US7717191B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode hammer drill with shift lock
CN102626913A (en) * 2011-02-01 2012-08-08 株式会社牧田 Power tool
CN102632481A (en) * 2011-02-13 2012-08-15 南京德朔实业有限公司 Electric hammer
CN102632481B (en) * 2011-02-13 2014-12-10 南京德朔实业有限公司 Electric hammer
CN102649266A (en) * 2012-04-16 2012-08-29 制尚电器(浙江)有限公司 Multifunctional double-speed electric hammer
CN102649266B (en) * 2012-04-16 2015-04-08 制尚电器(浙江)有限公司 Multifunctional double-speed electric hammer
CN102873669A (en) * 2012-10-15 2013-01-16 浙江恒友机电有限公司 One-button multifunctional switching structure

Also Published As

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EP0463416A1 (en) 1992-01-02
DE59100422D1 (en) 1993-11-04
DE4020269A1 (en) 1992-01-02

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