EP0539382A1 - Machine-outil manuelle electrique, notamment meuleuse angulaire. - Google Patents

Machine-outil manuelle electrique, notamment meuleuse angulaire.

Info

Publication number
EP0539382A1
EP0539382A1 EP91909786A EP91909786A EP0539382A1 EP 0539382 A1 EP0539382 A1 EP 0539382A1 EP 91909786 A EP91909786 A EP 91909786A EP 91909786 A EP91909786 A EP 91909786A EP 0539382 A1 EP0539382 A1 EP 0539382A1
Authority
EP
European Patent Office
Prior art keywords
coupling
locking
machine according
housing
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
EP91909786A
Other languages
German (de)
English (en)
Other versions
EP0539382B1 (fr
Inventor
Erich Borst
Bernhard Eicher
Fritz Kuettner
Anton Reiter
Dieter Schaefer
Willi Sproesser
Manfred-Wilhelm Staebler
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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0539382A1 publication Critical patent/EP0539382A1/fr
Application granted granted Critical
Publication of EP0539382B1 publication Critical patent/EP0539382B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • 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
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the invention is based on an electric hand tool, in particular an angle grinder, of the type defined in the preamble of claim 1.
  • Hand tools in particular angle grinders, of the type mentioned at the beginning are exclusively equipped with an on and off switch which is actuated via the switch strip.
  • the switch strip is located on the underside of the handle and is actuated by at least one finger when the handle is grasped and kept actuated while working with the machine.
  • the ergonomic design of the handle such as cross-sectional shape and angle of inclination to the device axis, is optimized for a single working position of the machine.
  • the same applies to the arrangement of the switch strip which is often equipped with a switch-on lock and switch-on lock, which can be operated quickly and safely in this working position.
  • Some hand machine tools are used in more than one working position for different operations.
  • An angle grinder e.g. is used in addition to grinding or scrubbing for cutting work, e.g. Cutting stone slabs, used.
  • the optimal working position mentioned above is usually given for the working position scrubbing, in which the
  • the grinding wheel points downwards, that is, it is approximately parallel to the switch strip.
  • the angle grinder is rotated 90 ° around its longitudinal axis to the left or right so that the cutting disc is approximately perpendicular to the workpiece. This rotation puts the handle and the switch bar in an unfavorable position for the comprehensive hand. If the machine is turned to the left and the handle is gripped with the right hand, the switch bar comes to rest in the ball of the hand. If the machine is turned to the right and held with the right hand, the switch bar can only be held and operated with the thumb. In 'both cases a safe and fatigue-Reies holding the button bar is not possible. In addition, in the event of danger, the position of the switch-on lock and switch-on interlock cannot be reacted to and switched off quickly enough.
  • the gear head with tool holder for the grinding and cutting disc is detachably arranged on the motor housing.
  • the gear head on the motor housing centering can be turned 90 ° to the right or left. After that they are Reinstall the screws and screw the gear head onto the motor housing.
  • the disassembly and reassembly of the gear head on the motor housing is relatively complex, so that this known angle grinder is not suitable for applications in which adjustments often have to be made.
  • the electric hand machine tool according to the invention in particular an angle grinder, with the characterizing features of claim 1 has the advantage of simple and quick handling.
  • the handle or gear head on the motor housing can be turned until the tool holder and switch strip are assigned to the new working position of the machine.
  • the locking device is activated again and the clamping device is actuated.
  • Locking and clamping devices ensure optimal safety for the operator, since on the one hand a relative rotation of the handle or gear head to the motor housing is reliably excluded and on the other hand there is a firm connection between the parts that can move with respect to one another. Both devices are designed for easy and realize space-saving and resistant to dirt "and dust.
  • the clamping device is particularly expedient realized in that the handle or gear head has a shell-like housing which engages with a radially projecting collar in a circumferential groove on the motor housing and has a longitudinal slot in the collar area, and in that the clamping device has a clamping screw extending transversely to the longitudinal slot, which by means of a clamping lever in a thread can be screwed so that the housing areas formed on both sides of the slot can be moved towards one another while reducing the width of the longitudinal slot.
  • the collar is clamped radially in the circumferential groove of the motor housing.
  • the locking device is expediently realized in that a number of locking grooves corresponding to the number of required working positions of the machine are provided in the motor housing, which are offset by corresponding angles of rotation, and in that a locking cam is pivotally arranged in the shell housing, which is form-fitting can intervene in one of the locking grooves.
  • An inevitable coupling of the locking and clamping device is achieved according to a preferred embodiment of the invention in that the locking cam is rotatably seated on a coupling sleeve coaxially surrounding the clamping screw, which in turn also with one of the coupling parts of the tooth coupling is operatively connected via a claw coupling.
  • This combination of clamping and locking device into a single unit has the advantage that there is only a single actuating lever and thus - apart from the simpler handling - it is ensured that there is always tension and vice versa with the locking. In contrast to the separate version of the locking and clamping device, it is not necessary to check separately after each changeover whether both devices are activated.
  • a contact element of an interrupter contact is arranged in the locking grooves on the one hand and on the locking cam of the locking device on the other hand, which is located in the electrical connecting line between the on and off switch actuated by the switch strip and the electric drive motor and is designed in such a way that that it is only closed when the locking cam engages in the locking groove. This ensures that the circuit to the electric drive motor is interrupted when the handle or gear head is adjusted and is only restored after proper locking and tensioning.
  • 1 is a side view of an electric angle grinder, 01535 PCT / DE91 / 00455
  • Fig. 2 is a side view of the handle in
  • FIG. 5 shows the same representation as in FIG. 3 of an angle grinding machine according to a further exemplary embodiment
  • FIG. 7 is a side view of a handle and a housing section of an angle grinder according to a third embodiment, partially in section,
  • FIG. 8 shows a section along the line VIII-VIII in FIG. 7.
  • the electrical angle grinder shown in the side view in FIG. 1 as an exemplary embodiment of a general electrical hand-held power tool has a motor housing 10, which does not show an electrical drive motor, on which the front end of the housing protrudes and the other side of which is a gear head
  • a handle 12 continues on the front of the housing.
  • a tool holder 13 can be seen, in which here a grinding wheel 14 is held, which is used in the extended position for scrubbing and in a broken line position rotated by 90 ° for separation.
  • the handle 12 consists of a handle 15, which when working with the
  • Angle grinder is enclosed by the hand, and from a bracket 16 attached to it in one piece, which covers the handle 15 on the underside leaving an access opening 17 and, when working with the angle grinder, covers the fingers placed around the handle 15 in a protective manner downwards.
  • a switch strip 18 projects into the passage opening 17 and actuates an on and off switch for the electric drive motor.
  • the gear head 11 is fixedly connected to the motor housing 10, preferably in one piece, while the handle 12 is rotated relative to the motor housing 10 and can be fixed in certain rotational positions on the motor housing 10 by means of a locking and clamping device, both of which are actuated with a clamping lever 19 .
  • the handle 12 has a shell-like housing, hereinafter referred to as the shell housing 20, which engages with a radially projecting collar 21 in a circumferential groove 22 on the motor housing 10 to hold the handle 12 rotatably on the motor housing 10.
  • the shell housing 20 has a longitudinal slot 23 (FIG. 3), which enables the collar 21 to be clamped radially at the base of the circumferential groove 22 by means of the clamping device 24.
  • the shell housing 20 is made from two half-shells, which by three
  • FIG. 3 shows the two half-shells 201 and 202 and one of the screw connections 25.
  • the longitudinal slot 23 is on the top of the Schal ⁇ ng ⁇ phases 20 formed on the butt joint of the two half-shells 201, 202.
  • the clamping device 24 consists of a tension screw 26, which extends directly below the longitudinal slot 23 transversely to the housing axis and passes through a bore 27 in one half-shell 201 and can be screwed into a threaded hole 28 in the other half-shell 202.
  • the tensioning screw 26 is actuated by the tensioning lever 19, as will be explained in more detail below.
  • the first coupling part 31 has a gear rim with a radially protruding coupling teeth 34 on the section tapered in diameter, in which the first coupling part 31 engages coaxially and engaging in the coupling teeth 34 of a gear ring on the second.
  • the second coupling part 32 is formed in one piece with the clamping lever 19, which projects at right angles from the second coupling part 32 and extends laterally on the shell housing 20.
  • a bolt 35 is screwed in at the end, which carries 3 and 36.
  • the compression spring 38 is supported between the collar 36 and the ring web 37 in the interior of the hollow cylindrical coupling part 32.
  • the block length of the pressure threads 38 and the axial length of the clutch teeth 34 are matched to one another such that by pulling the tensioning lever 19 away from the shell housing 20, the second clutch part 32 can be axially displaced so far that the clutch teeth 34 apart from the second part 31, and 31 are.
  • the locking device 40 enables the handle 12 to be fixed in three different rotary positions on the motor housing 10, specifically in a basic position shown in FIGS. 1-3 and in rotary positions offset by 90 °, which are caused by rotating the handle 12 about the longitudinal axis of the housing from the basic position can be adjusted to the left or right.
  • the motor housing 10 carries three housing pins 41-43 which are offset by 90 ° from one another and which project radially into the interior and each carry a locking groove 44-46.
  • a circular arch-shaped web 52 connects the three locking pins 41-43 in one another, each of which attaches to the free end of the housing pins 41-43 and is integral therewith.
  • a locking cam 47 interacts with the locking grooves 44 - 46 and can be pivoted into the locking grooves 44 - 46 in a form-fitting manner to fix the handle 12 on the motor housing 10.
  • the bar-shaped locking cam 47 / whose shape can be seen in FIG. 2 is seated in a rotationally fixed manner on the coupling sleeve 29, which is a component of the locking device 40.
  • Coupling sleeve 29 is rotatably seated on the clamping screw 26 of the clamping device 24 and carries on it the first coupling part 31 of the toothed coupling 30, ring ring 39, claws 48 of a claw coupling 50, which with corresponding claws 48 on the end face of the second
  • Coupling part 32 of the tooth coupling 30 cooperate.
  • the claws 48 on the coupling sleeve 29 and on the second coupling part 32 are designed such that when the second coupling part 32 is axially displaced in order to release the tooth coupling 30, the claws 48 remain in engagement with one another, so that the claw coupling 50 is not released therefrom.
  • the handle 12 is to be turned so that the locking cam 47 is aligned with one of the locking grooves 44-46. Then the clamping lever 19 from the in Fig. 2nd
  • the tensioning lever 19 To adjust the clamping force of the tensioning screw 26, the tensioning lever 19 must be pulled out axially from the switching housing 20 until a stop is given on its block length by compressing the pressure springs 38. In this position, the teeth 34 of the tooth coupling 30 are disengaged, and the tensioning lever 19 is disengaged from the tensioning screw 26. Since the claw coupling 50 remains closed, the connection between the locking cams 47 and the clamping lever 19 is maintained. The tensioning lever 19 uncoupled from the tensioning screw 26 is now pivoted back a little in the direction of the arrow 49 because of the stop 51 and released again.
  • the tensioned compression spring 38 engages the coupling parts 31 and 32 of the tooth coupling 30 again, and the clamping lever 19 and clamping screw 26 are again connected to one another in a rotationally fixed manner.
  • the clamping lever 19 is again pivoted in the direction of arrow 49 up to the stop 51 and the toothed screw 26 is screwed further into the threaded hole 28.
  • clamping device 124 and the locking device 140 are designed separately from one another and must be operated separately. This makes handling somewhat cumbersome, but the design is more economical in terms of manufacturing costs.
  • the clamping device 124 is unchanged and coincides with the clamping device 24 in FIG. 3. Di ⁇ the clamping screw 26 surrounding coupling sleeve, the component of d ⁇ r
  • the locking device 140 is arranged diametrically to the clamping device 124 at the front transition of the bracket 16 into the handle 15 of the handle 12.
  • a bearing sleeve 56 arranged in one piece on the half-shell 201, a locking lever 57 with a bearing bolt 58 is pivotably mounted.
  • the ⁇ in ⁇ H ⁇ b ⁇ larm d ⁇ s V ⁇ rr Trentslungsh ⁇ b ⁇ ls 57 is designed as an actuation key 59, while the other lever arm forms the locking cam 147.
  • the locking lever 57 is arranged in a recess 61 in the bracket 16 and is loaded by its bending arm 60 such that the actuation button 59 protrudes from the recess 61 on the bracket 16 (FIG. 6).
  • the locking cam 147 grips in three of the locking grooves 144-146, which are arranged on the outside of the motor housing 10.
  • the locking grooves 144-146 are in turn offset by 90 ° so that the handle 12 can be turned in the same way and locked and clamped in the same rotary positions.
  • the locking cam 147 automatically falls into the respective locking groove 144-146 as a result of the action of the spiral spring 60, so that only the clamping lever 19 has to be actuated in the manner described. Only two different levers have to be actuated to release the clamping device 24 and the locking device 140.
  • the bracket 216 of the handle 12 also acts as a clamping lever for the synchronous actuation of the clamping device 224 and the locking device 240 , which each protrude inward on a half-shell 201 or 202 of the shell housing 20 and are flush with one another.
  • the other end of the bracket 216 is releasably attached to the handle handle 15 by means of a snap lock 64 (FIG. 7).
  • the clamping device 224 (FIG. 8) in turn comprises the clamping screw 26 which on the one hand passes through the bore 27 in the half-shell 201 and on the other hand can be screwed into the threaded hole 28 in the other half-shell 202.
  • the bore 27 in the bearing pin 62 and the thread hole 28 in the other bearing pin 63 are coaxially made.
  • a coupling sleeve 229 which is non-rotatably connected to the bracket 216, is rotatably seated on the clamping screw 26.
  • the coupling sleeve 229 is connected to one another via a tooth coupling 230 arranged at the end
  • Entkupplungsgli ⁇ d 65 in operative connection.
  • the hollow-cylindrical coupling coupling 65 carries a mushroom grip 66 in one piece at the free end and encloses a screw head-like section 67 of the clamping screw 26.
  • a bolt 35 is screwed in at the end, which carries a collar 36.
  • the pressure spring 38 is supported between the collar 36 and an annular web 37 inside the uncoupling member 65.
  • the axial length of the coupling teeth of the tooth coupling 230 and the block length of the compression spring 38 are matched to one another in such a way that by pulling out the decoupling member 65 against the force of the compression spring 38, the coupling teeth of the tooth coupling 230 disengage before the axial displacement of the " 65 " the compression spring 38 is blocked to block length
  • the decoupling member 65 is connected in a rotationally fixed manner to a section 67 of the clamping screw 26 via a claw coupling 250.
  • the claw coupling 250 is designed so that the rotationally fixed connection remains even when the tooth coupling 230 is released.
  • Locking device 240 and clamping device 224 are positively coupled and are actuated simultaneously via bracket 216.
  • the locking cam 247 (FIG. 7), which can be pivoted into three locking grooves 244-246 in the motor housing 10, is formed on the free end protruding beyond the pivot point 216.
  • the locking grooves 244-246 are in turn inserted into the housing journal 241-243 of the motor housing 10, which protrude into the interior of the housing offset by 90 ° to one another and are connected by the web 52 in the form of an arc of a circle. If the bracket 216 is fixed to the handle handle 15 by the snap lock 64, the locking cam 247 engages positively in one of the three locking grooves 244-246.
  • an interrupter contact 69 is arranged between the on / off switch 68 (FIG. 7) actuated by the switch strip 18 (FIG. 7) for the electric drive motor and the electric drive motor, which is only closed when the bracket 216 is in the snap lock 64 snapped onto the handle 15 and thus the
  • Locking cam 247 is pivoted into one of the three locking grooves 244-246. If the locking cam 247 is pivoted out of the respective locking groove 244-246, the interruption contact 69 is automatically opened and any power supply to the electric drive motor is interrupted. In order to implement this interrupter contact 69, two contact springs 71, 72 are arranged in each locking groove 244-246
  • Locking cams 247 are connected to one another by means of a contact bridge 70 with two lateral contact surfaces 73 on the locking cam 247.
  • the one contact spring 71 in all three locking grooves 244-246 is connected to a first plug contact 74 and the other three contact springs 72 of the locking grooves 244-246 are connected to a second plug contact 75. While the first plug contact 74 is connected to an output of the bipolar on / off switch 68, a current brush of the electrical drive motor is connected to the second plug contact 75.
  • Locking device 240 and clamping device 224 is similar to that described in FIGS. 1-3. With swiveling of the 3shes 216 after releasing the snap lock 64 in
  • the direction of the arrow 249 is pivoted out of the locking cam 247 out of the locking groove 244 and at the same time the power supply to the electric drive motor is interrupted.
  • the bracket 216, the coupling sleeve 229, the tooth coupling 230, the decoupling member 65 and the Claw coupling 250 unscrews the clamping screw 26 more from the threaded hole 28, so that the clamping connection between the collar 22 on the shell housing 20 and the circumferential groove 22 in the motor housing 10 is released.
  • the handle 12 can now 90 ° to the left or right in the new
  • the invention is not limited to the exemplary embodiment described.
  • the handle can be fixed and the gear head rotatably connected to the motor housing his.
  • the clamping and locking device is then to be arranged between the gear head and the motor housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Machine-outil manuelle électrique, en particulier meuleuse angulaire, dans laquelle la poignée (12), avec le commutateur de déclenchement (18), est montée pivotante par rapport au logement de l'outil (13) sur la tête de transmission (11), afin d'assurer une manipulation ergonomique. Pour obtenir un changement rapide et facile de la position relative de la poignée (12) et du logement de l'outil (13), la poignée (12) est blocable en rotation, en au moins deux positions de rotation, au moyen d'un dispositif de verrouillage à commande manuelle (40), sur le boîtier (10) du moteur recevant la commande électrique, et peut être serrée sur ledit boîtier (10), au moyen d'un dispositif de serrage à commande manuelle (24). Selon une forme d'exécution préférée, le dispositif de verrouillage (40) et le dispositif de serrage (24) sont accouplés en force et sont actionnés simultanément au moyen d'un seul levier de serrage (19).
EP91909786A 1990-07-17 1991-05-28 Machine-outil manuelle electrique, notamment meuleuse angulaire Expired - Lifetime EP0539382B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4022668 1990-07-17
DE4022668A DE4022668A1 (de) 1990-07-17 1990-07-17 Elektrische handwerkzeugmaschine, insbesondere winkelschleifmaschine
PCT/DE1991/000455 WO1992001535A1 (fr) 1990-07-17 1991-05-28 Machine-outil manuelle electrique, notamment meuleuse angulaire

Publications (2)

Publication Number Publication Date
EP0539382A1 true EP0539382A1 (fr) 1993-05-05
EP0539382B1 EP0539382B1 (fr) 1994-10-19

Family

ID=6410426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909786A Expired - Lifetime EP0539382B1 (fr) 1990-07-17 1991-05-28 Machine-outil manuelle electrique, notamment meuleuse angulaire

Country Status (7)

Country Link
US (1) US5407381A (fr)
EP (1) EP0539382B1 (fr)
JP (1) JP3032006B2 (fr)
BR (1) BR9106644A (fr)
DE (2) DE4022668A1 (fr)
ES (1) ES2064106T3 (fr)
WO (1) WO1992001535A1 (fr)

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Also Published As

Publication number Publication date
JPH05508353A (ja) 1993-11-25
BR9106644A (pt) 1993-06-08
DE4022668A1 (de) 1992-01-23
DE59103294D1 (de) 1994-11-24
JP3032006B2 (ja) 2000-04-10
EP0539382B1 (fr) 1994-10-19
WO1992001535A1 (fr) 1992-02-06
US5407381A (en) 1995-04-18
ES2064106T3 (es) 1995-01-16

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