DE8436421U1 - Electric hand machine, in particular for drilling, as a starter for an implement, in particular a motor-driven mower - Google Patents

Description

Registration number. 200 134 b

Ingrid and Werner GIRRBACH
in Ötisheim (Baden-Württemberg)

Electric tape machine, especially for drilling,

as a starter for a work device, in particular a motor-driven mower

The invention relates to an implement, in particular a lawnmower, with a tool such as a rotating knife, that from an internal combustion engine built into or attached to the device can optionally be driven with a built-in or built-in mechanical starter, as well as an electrical one Hand machine, in particular a drill or a screwdriver, with an exchangeable rotating tool like a drill, as a starter for the working device. While starting an internal combustion engine by means of an electric starter or a hand-windable spring motor generally poses no problems prepared, the often unsuccessful efforts to start the internal combustion engine are known, if this is with a mechanical one Starter is provided, which has a pull cord that must be pulled off as quickly as possible, to cause the engine to ignite.

The egg finding is therefore based on the task of tempering of internal combustion engines in work equipment. To solve this problem soU from the thought of a use Existing almost everywhere in workshops and households electric hand machines are assumed.

The object set is achieved according to the invention by that in a working device of the type mentioned, the shaft of the motor or starter, or a with this shaft possibly non-rotatably connected rotating part of the device, at a free end accessible from outside the device

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is provided with one part of a rigid shaft coupling, the other part of which is removed and axially attachable to the production of the coupling is; and that in the case of an electric hand machine of the type mentioned at the outset, instead of the tool, a freewheel or Overrunning clutch or a disengaging centrifugal clutch as a clutch of a first shaft stub clamped in the machine and a second stub shaft is provided which | is provided with the other part of the rigid shaft coupling. This advantageously ensures that the work ο starting the internal combustion engine, for example, by a ordinary electric hand drill can be taken over, which is temporarily converted almost as easily how the working device is permanent, so that the electric hand machine is not constantly withdrawn from its normal working purpose but can be used for the intended purposes.

A particular advantage of the implement according to the invention is seen in the fact that his internal combustion engine does not necessarily have to be provided with its own starter in order to get started to be able to, since for this purpose the electric hand machine of the usual type equipped according to the invention is available stands.

The working device according to the invention is preferably designed so that the device-side coupling part has a non-circular or frontally profiled driver. In the illustrated embodiment the device-side coupling part aiTv a slotted driver that fits into the complementary shaped coupling part on the machine side. The rigid shaft coupling but could also consist of two parts, the complementary drivers each in the form of two identical half helical surfaces have, which can each be converted into one another by rotating through 180 ° around the coupling axis. Of course there are others too Configurations of the rigid shaft coupling are conceivable, to which only the condition is linked that the two coupling parts can be easily joined together axially and easily separated axially

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as well as a non-rotatable connection of the electric hand machine with the working device, the torsional strength only needing to exist in one direction of rotation and even should / so that the two coupling parts can execute a rotary movement relative to one another, in which they are preferably separated from one another by automatic axial forces, as they for example, the pairing of the above-mentioned coiled carriers is generated.
In the implement according to the invention, the device-side part of the rigid coupling can be provided on a rotating part which is temporarily non-rotatably connected to the shaft rotating the tool by means of a freewheeling or overrunning clutch or a disengaging centrifugal clutch. In the exemplary embodiment, the rotating part is an extension of the starter shaft which, as is known, is temporarily non-rotatably connected to the motor shaft via one of the aforementioned clutches until the clutch separates the two shafts rotating at different speeds after starting the internal combustion engine.

The electric hand machine according to the invention can, if they has a drill chuck, for example, be designed to match the implement according to the invention in that the Drill chuck takes the prefabricated unit from the two stub shafts with an interposed coupling as an attachment.

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In the following the invention is based on an embodiment of the invention illustrated by way of example in the drawing Tool, namely a lawn mower, in connection with the electric hand machine according to the invention, for example a drill, essentially explained.

The only figure in the schematic drawing shows a horizontal one Side view of the lawnmower with the drill attached.

The lawnmower initially shows "one" from the bottom to Dben rotating knife 10 on all sides shielding bell 12 on which a housed internal combustion engine 14 sits, whose vertical shaft 16 at its lower end the knife and at its upper end the lower part 18.1 of a freewheel or Overtaking or disengaging centrifugal clutch 18 carries, over which a mechanical starter 20 sits with a pull cord 22, whose vertical shaft 24 at its lower end the upper part 18.2 of the coupling 18 and at its upper end a slotted driver 26 carries, which is arranged outside of the starter housing. The part protruding upwards from the starter housing 24.1 of the starter shaft can subsequently be connected non-rotatably to its lower part 24.2 if the lawnmower does not was equipped with it from the start.

The drill 28 has a motor shaft 30 to which a drill chuck 32 is attached, which normally receives a drill shaft. An upper shaft stub is now in the drill chuck 32 j 34 plugged, the with a lower shaft stub 36 by means

j a freewheeling or overtaking or disengaging centrifugal

f coupling 38 is connected, the upper part 38.1 and the

lower part 38.2 fixed, in particular non-rotatable, with the stub shaft 34 and 36 are connected. At its lower end is the lower stub shaft 36 with two plane-parallel driver surfaces 40 provided, which are adapted to the driver 26 of the lawn mower and both an axial joining of the drill and of the lawnmower as well as convey a non-rotatable connection between the two, i.e. represent a rigid shaft coupling.

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To start the lawnmower by means of the drill 28, the pull cord 22 is not pulled off the mechanical starter 20, but the driver surfaces 40 are inserted into the driver 26. During the subsequent commissioning of the drilling machine
28, the clutches 18 and 38 are effective, so that the drill sets the shaft 16 of the combustion engine 14 in rotation while the starter shaft 24 rotates, until the combustion engine
has started and the first either the device-side
Coupling 18 odsir ui5 luäSCitinsnseitiye coupling 3u «is from XnT
The rotary connection that has been made loosens / so that the drill cannot be damaged under any circumstances. So in principle one is sufficient
the two clutches 18 and 38; that in the embodiment
Both are present, is due to the assumption that a lawnmower should be started, which can also be started on conventional Weije, and that the start-up according to the innovation by means of a drill with an attachment
should be carried out, which has its own clutch (38) for the
Has the case that a novel lawnmower without its own starter 20 and clutch 18, which is possible as a result of the invention
is to be started.

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Claims (1)

Electric hand machine, in particular a drill (28) or screwdriver, with an exchangeable rotating tool such as a drill, as a starter for a working device, in particular a lawn mower, with a tool such as a rotating knife (10) that is inserted in or on the device - or attached internal combustion engine (14) can be driven, if necessary with attached mechanical starter (20), the shaft (16 or 24) of the motor C! 4) or starter (20), or a rotating part that may be connected to this shaft in a rotationally fixed manner ( 24.1) of the device, -at a free end accessible from outside the device is provided with a part (26) of a rigid shaft coupling (26,40), the other part (40) of which is removed and axially attachable to produce the coupling, characterized that instead of the tool an overrunning or overrunning clutch (38) or a disengaging centrifugal clutch (38) as a clutch of a first shaft stub clamped in the machine ( 34) and a second shaft stub (36) is provided, which is provided with the other part (4o) of the rigid shaft coupling (26, 4o). Parking garage at the building: entrance at the corner of Tuttlingef Strasse Bank code 600 90 100, account no. 4 553 950, Stuttgart Bank Oral information and requests need / en.sijhriftiiohqr jkstäligurtf;