EP0909615A1 - Hand-held power tool - Google Patents

Abstract

At least one handle (30) is fixed to a support (28) itself fixed by one end (63) to the housing (12). The second end (64) of the support has at least one holder (42) for fixing the first handle in a first position (61). The free end (29) of the first handle protrudes towards the housing. The support has at least one second holder (44) for fixing the first handle in a second position at an angle to the first position.

Description

The invention relates to a power-operated hand tool a housing in which a drive for a tool is accommodated is, with at least a first handle on a carrier is fixed, which is attached to the housing with a first end is and protrudes laterally from the housing with a second end.

Such a hand tool is known from DE 38 26 212 A1.

The known hand tool is a hammer drill, with a fixed one attached below the housing Handle handle and an additional handle handle (chisel handle), which is only applied when chiseling. The chisel handle is on the housing at a perpendicular to the handle of the handle provided crossbar attached and extends parallel to Handle handle, but in the opposite direction, namely towards above. In addition, the chisel handle can be moved by a certain amount be pivoted to better hold the hand tool to enable.

The known hand tool may be an improved one as a rotary hammer Allow grasping of the hand tool, however the additional assembly or disassembly of the second handle proven cumbersome and sometimes distracting. Further even with such an additional handle, an optimal, particularly ergonomic posture for the user of the Hand tool enables.

In the case of a drilling machine, it is also from EP 0 142 650 A2 basically known, in addition to a pistol-shaped Handle at the end of the drill an additional handle to be provided on the spindle neck of the drill below the gearbox is attached using a clamp. The additional handle is at both ends with a Connected bracket, which in the clamp for attachment to Spindle neck of the machine passes.

In this way, an improved, more ergonomic posture possible, but is often, especially in percussion drilling, stronger damping is desired.

In addition, there are various, partially adjustable handlebar arrangements become known for use with hand tools (see DE 25 59 132 C2, DE 39 21 752 A1, US 4 060 940). The use of handlebars of this type leads in part to one Enlargement and cumbersome handling of the hand tool. In addition, there is still insufficient cushioning against vibrations occurring during work.

Another problem with such hand tools occurs in particular when working with heavy angle grinders that are in usually have to be held with two handles, namely with a first handle on the front end of the housing in the Near the grinding wheel and with a second handle on rear end of the housing, usually with a switch is combined. With such an angle grinder as he is known from US Pat. No. 4,060,940, for example Handle facing the grinding wheel is bow-shaped and extends above the housing to an attachment point on the protective hood.

Such an arrangement can either be optimized for separation, working in the direction of the cutting disc, or optimize for roughing, being flat with the surface the grinding wheel is being worked. Optimal posture both for roughing as well as for cutting with a simultaneous Damping the handle is not possible here.

The invention is therefore based on the object, a power-driven Hand tool according to the type mentioned above to improve that improved handling especially at an execution as an angle grinder is achieved to a possible to enable fatigue-free working. Furthermore to improve damping for shocks from the tool, Vibrations, shaking movements, load reactions and the like to be able to work even under difficult conditions with heavy equipment fatigue for the user to keep it as low as possible.

This object is achieved according to the invention with a hand tool the type mentioned solved in that the carrier its second end at least a first shot of one Attaching the first handle in a first position has that the first handle with a free end in Protrudes towards the housing.

The object of the invention is completely achieved in this way.

According to the invention, namely, that the handle of one Carrier with a free end towards the housing protrudes, that the handle is closer to the center of gravity of the hand tool, which makes the hand tool considerably can be kept easier because lever arms are shortened are. In addition, the fact that the handle with a End is not recorded on a bracket or the like, but protrudes freely from the carrier, achieves an improved damping effect, so that vibrations and shocks occurring when working and the like. To a significantly reduced extent by the user of the Hand tools are perceived.

In a preferred development of the invention, the carrier has at least one second receptacle for attaching the first Handle in a second angled to the first position Position on.

In this way, an optimal adjustment of the position of the Handle various working methods with the hand tool enables.

The hand tool is a preferred further development of this embodiment designed as an angle grinder with an elongated housing, the gearbox at its tool end with one arranged at an angle to the longitudinal axis of the housing Has drive spindle for a disk-shaped tool, the first and second receptacles of the carrier being arranged in this way are that the first handle in the first position positioned for roughing and in the second position for cutting is.

In this way, with a handle that is optionally in the in the first or in the second position on the carrier, an improved posture for the user both when disconnecting and roughing can be achieved in both operating modes to ensure fatigue-free work.

In an additional development of this version, this is second recording arranged so that the in the second position attached first handle runs such that a through the focus of the hand tool is about the level The middle of the first handle runs.

This will keep you tired when in use of the hand tool for abrasive cutting above the protective hood of the angle grinder. Tilting moments that with conventional Angle grinders with handles have so far occurred so largely avoided. At the same time, the with a free end protruding from the carrier first handle good damping guaranteed.

In a further development of this version is the first shot arranged so that the first handle in the first position on the side of the gear housing facing away from the tool runs near the axis of rotation of the drive spindle.

In this way, the fatigue-free posture of the Hand tool reached in roughing operation since the first Handle above the tool designed as a grinding wheel is near the center of gravity, which is approximately runs through the axis of rotation of the drive spindle.

When these two features are combined, an optimized one can be obtained fatigue-free posture both when separating and reach when roughing. At the same time, the tool can both during cutting and roughing.

In an additional development of the invention is a second Handle on the end of the housing facing away from the tool essentially arranged in the longitudinal direction of the housing and around its Longitudinal axis adjustable at least in two angular positions.

Thus, in particular when executing the hand tool achieved better guidance and posture as an angle grinder be because the angle grinder with the second hand on End can be held, with the handle at the same time the switch for switching the angle grinder on and off can be. Both for the separator and for the The second handle can be comfortably gripped from above as it is depending on the working method in the desired Position can be adjusted about its longitudinal axis. Here is an adjustment possibility by a total of 2 x 90 ° preferred to both a cut-off from the right as well as from the left as well to allow rough grinding.

In an advantageous development of the invention, the carrier is included its first end on the housing in different angular positions noticeable.

This way it is possible to make the first move ever depending on the tool used and the operating mode of the hand tool adapt optimally to the geometric conditions, to work as effortlessly as possible and also work to allow in hard to reach places.

In an expedient development of this embodiment, the housing and cooperating with each other at the first end of the carrier Locking elements for form-fitting fixing of the carrier provided in different angular positions.

In this way, a quick and easy adjustment can be made reach the desired position of the first handle, where, for example, a spring for securing the carrier in the locked position can be provided.

In an additional development of this version is a stop provided to limit the angular position of the carrier.

In this way, unsuitable positions of the first Handle excluded and possible injuries by too much adjustment, for example in the direction of the tool or a protective hood when running as an angle grinder be avoided.

As previously mentioned, the free end protrudes of the first handle achieved an improved damping effect.

In addition, the carrier can be used as a damping element be designed for vibration damping.

For this it is possible to use the carrier as a rubber-metal composite part, as a plastic part with damping inserts or similar to train.

According to a further embodiment of the invention, the Carrier a surface designed as a protective shield to protect against Touching the tool.

In this way, especially when used as an angle grinder an additional protection against flying sparks regardless of the use and position of those concerned Protective hood guaranteed.

According to a further embodiment of the invention, there are two opposite sides of the housing attachment points intended for the wearer.

This way the first handle can be used by both right-handed people as well as for left-handers.

According to a further embodiment of the invention, the hand tool as a drill with a second pistol-shaped Handle formed on the end of the housing facing away from the tool and the first handle in the first position opposite one perpendicular to the axis of rotation of a chuck Plane at an acute angle towards the second pistol-shaped Handle inclined backwards.

In this way, an ergonomically optimized posture is Work done with the drill.

It is understood that the above and those below Features of the invention to be explained not only in the specified combination, but also in others Combinations or alone can be used without the To leave the scope of the present invention.

Fig. 1

eine erste Ausführung der Erfindung am Beispiel eines Winkelschleifers, wobei sich der erste Handgriff in einer zum Schruppen geeigneten Position befindet;

Fig. 2

eine Ansicht einer gegenüber der Ausführung gemäß Fig. 1 leicht abgewandelten Ausführung, in einer um 90° verdrehten Position, wobei sich der erste Handgriff nunmehr in einer zweiten, zum Trennen geeigneten Position befindet;

Fig. 3

eine perspektivische Ansicht einer weiteren Ausführung des erfindungsgemäßen Handwerkzeuges als Winkelschleifer im Bereich des Getriebegehäuses, wobei der Träger zur Aufnahme des ersten Handgriffes zusätzlich eine als Schutzschild ausgebildete Fläche zum Schutz gegen Funkenflug umfaßt;

Fig. 4

eine weitere Abwandlung der Erfindung in perspektivischer Darstellung, wiederum als Winkelschleifer in einer zum Trennen geeigneten Position;

Fig. 5

eine weitere Abwandlung der Ausführung gemäß Fig. 3 in perspektivischer Darstellung, wiederum in einer zum Schruppen geeigneten Position, wobei ein zusätzlicher Schutzschild am Träger befestigt ist;

Fig. 6

eine weitere Abwandlung der Ausführung gemäß Fig. 4 in einer zum Trennen geeigneten Position, in perspektivischer Darstellung, wobei wiederum am Träger ein zusätzlicher Schutzschild befestigt ist;

Fig. 7

eine Ansicht eines weiteren erfindungsgemäßen Handwerkzeuges, das als Bohrmaschine ausgeführt ist und

Fig. 8

eine Ansicht eines weiteren erfindungsgemäßen Handwerkzeuges, das als Schwingschleifer ausgebildet ist.

Further features and advantages of the invention result from the following description of preferred exemplary embodiments with reference to the drawing. Show it:

Fig. 1

a first embodiment of the invention using the example of an angle grinder, wherein the first handle is in a position suitable for roughing;

Fig. 2

a view of an embodiment slightly modified from the embodiment according to FIG. 1, in a position rotated by 90 °, the first handle now being in a second position suitable for separation;

Fig. 3

a perspective view of a further embodiment of the hand tool according to the invention as an angle grinder in the area of the transmission housing, the carrier for receiving the first handle additionally comprising a surface designed as a protective shield for protection against flying sparks;

Fig. 4

a further modification of the invention in perspective, again as an angle grinder in a position suitable for cutting;

Fig. 5

a further modification of the embodiment of Figure 3 in perspective, again in a position suitable for roughing, with an additional protective shield attached to the carrier.

Fig. 6

a further modification of the embodiment of Figure 4 in a position suitable for separation, in perspective, again an additional protective shield is attached to the carrier.

Fig. 7

a view of another hand tool according to the invention, which is designed as a drill and

Fig. 8

a view of another hand tool according to the invention, which is designed as an orbital sander.

1 shows a hand tool according to the invention as a whole number 10.

The hand tool 10 is a version as Two-hand angle grinder with a first handle 30 on the front End of the housing 12 and a second handle 38 on rear end of the housing, which is designed as a switch handle is.

The angle grinder is in a known manner with a Quick release lever 48 provided for clamping a grinding wheel and has a protective hood in a likewise known manner 20 for the grinding wheel, which can be adjusted in angle if necessary can be arranged.

In the housing 12 is a drive 14 not shown in Formed an electric motor, whose rotary motion over an angular gear in the gear housing 16 at the front end of the Housing 12 in a drive movement for a drive spindle is implemented with the tool in the form of a roughing or Cutting disc is driven.

The first handle 30 is on an approximately rod-shaped Carrier 28 set, which is approximately at right angles from the gear housing 16 protrudes to the side and has a first end 63 in a receptacle 50 in the form of a threaded bore using a Fastener such as a screw 46 set is. The carrier 28 has one at its second, outer end 64 first receptacle 42 for receiving the first handle 30 and a second, only schematically indicated receptacle 44 for receiving of the first handle 30 in a different position.

In the first position 61 of the first shown in FIG. 1 Handle 30 is this in the first receptacle 42, which is a threaded blind hole is trained, screwed in and stands with his outer, free end 29 somewhat obliquely forward and in the direction to the longitudinal axis 18 of the housing 12. The first move 30 closes in this first position 61 with the carrier 28 about an angle of 30 to 70 °.

In the position shown in Fig. 1, the angle grinder used for roughing, being a workpiece surface is processed flat with the grinding wheel. This stops the operator holds the hand tool 10 with his left hand first handle 30 and with the right hand on the second handle 38.

For the best possible guidance and fatigue-free work the carrier 28 and the first receptacle 42 arranged such that the first handle 30 in the direction extends to the longitudinal axis 18 of the housing 12 and thus as far as possible is close to the center of gravity of the machine. Around To ensure an optimal position, the bracket 28 is angular adjustable on the receptacle 50 of the gear housing 16 fixed, as indicated by the double arrow 36.

The second handle 38 on the protective hood 20 opposite End of the angle grinder has a button 41 on it Top and a switch 40 only indicated by dashed lines its bottom on. For security reasons, the switch 40 can only be operated when the button 41 is depressed is.

The second handle 38 is about its longitudinal axis, which is approximately in Direction of the longitudinal axis 18 of the housing 12 extends in three different angular positions, each 90 ° to each other are offset, adjustable, as indicated by the double arrow 39 is. In the position shown for roughing the second handle in such a position that button 41 is on top and switch 40 is on the bottom lies, so that the button 41 is depressed with the thumb while working can be and the button 40 then by contracting the rest of the fingers on the underside of the handle 38 can be operated.

In that the first handle 30 at the second end 64 of the carrier 28 is fixed, the side of the gear housing 16 protrudes and the handle with only one end in the first holder 42 is screwed onto the second end 64 of the carrier 28 and the other end of the handle 30 is formed as a free end 29 is, the first handle 30 contributes significantly Damping vibrations, load change movements, vibrations and the like. When working from the tool to the handle be transmitted. In addition, the special arrangement of the first handle 30 and the second handle 38 one ergonomically particularly favorable posture achieved that additionally still optimized by angular adjustment of the carrier 28 can be. Because the first handle 30 is near the gearbox 16, just above the focus of the Machine is located, relatively low leverage occurs, so that fatigue-free work is made possible.

In the position shown, the first handle 30 is for Right-handed who normally uses the machine right hand on the second handle 38 and with the left hand on guide first handle 30.

For left-handed use is on the opposite side of the Angle head 16 a further receptacle 52 for attaching the Carrier 28 provided. When screwing the carrier 28 into the second receptacle 52 would be the free end 29 of the first handle 30, of course, in turn point towards the gear housing 16.

Fig. 2 shows a again designed as an angle grinder Hand tool 10a in a compared to the representation of FIG. 1 position rotated by 90 ° from the side. The angle grinder is largely identical to that previously described with reference to FIG. 1 Angle grinder trained, which is why for appropriate Parts corresponding reference numerals are used. In addition 2 is a tool 26 in the form of a cutting disc clamped on the drive spindle 22. Furthermore the carrier 28 is not screwed to the angle head 16, but via locking elements 31, 32 in different angular positions locked in place, as indicated by the double arrow 36 is. It is in a locked position additionally provided a spring element, not shown.

The angle grinder is in a position suitable for cutting shown, the first handle 30 now in the second receptacle 44 of the carrier 28 is screwed in and is thus in a second position 62 opposite the first position 61 is angled according to FIG. 1.

The first handle 30 is approximately parallel to the Axis of rotation 24 of the drive spindle 22 extending plane and can, if desired, as shown by the double arrow 36 is, also with its longitudinal axis parallel to the axis of rotation 24 of the drive spindle 22 are aligned.

By stops 33, 34 it is avoided that the first Handle 30 is moved into an unsuitable angular position, which could endanger the user.

The second handle 38 was compared to that shown in FIG. 1 Position rotated 90 ° counterclockwise, so that the button 41 is in turn on the top of the handle 38 and the switch 40 on the bottom of the Handle 38 is located.

In the illustrated position of the angle grinder suitable for cutting runs the first handle 30 such that a level set by the center of gravity of the hand tool 10a runs through the center of the first handle 30.

In this way, the hand tool is held without fatigue 10a by means of the first handle 30, since that Hand tool 10a simply hangs vertically downwards without a tilting moment must be exerted on the handle 30.

For an equally optimal position of the angle grinder to ensure both when cutting and when grinding, So only the first handle 30 must either in the first receptacle 42 or in the second receptacle 44 of the carrier 28 are screwed in and if necessary angularly with the help of Locking elements 31, 32 can be set in a suitable position. In addition, the second handle 38 is about its longitudinal axis twisted into the appropriate position.

It goes without saying that instead of the adjustment means Locking elements other adjustment options may be provided can, and that the carrier even without the aid of a tool e.g. a bayonet lock in combination with a Spring for pulling away and turning the housing can be fixed.

Some modifications of the previously explained with reference to FIGS. 1 and 2 Angle grinders are simplified in FIGS. 3 to 6 Shown in perspective and in total the numbers 10b, 10c, 10d and 10e. The same reference numbers are used used for corresponding parts.

In Fig. 3, the carrier 28 is additionally with a widened Provided area in the form of a protective shield 54 to thus improved protection of a user's hand against touch of the grinding tool to ensure that the hand tool 10b grips the first handle 30.

In Fig. 4 is again designed as an angle grinder Hand tool 10c shown, but now in one for separating suitable position, the first handle 30, as can be seen, approximately parallel to the axis of rotation of the grinding tool 26 runs. The carrier 28 corresponds to that previously based on the 1 and 2 explained embodiment without a protective shield.

Fig. 5 shows an overall designated by the number 10d Hand tool, which is essentially the embodiment according to FIG. 3 corresponds and an angle grinder in a suitable for roughing Position shows. Again there is a protective shield 54 provided on the carrier 28, but here in contrast 3 not the carrier 28 itself between its two ends is widened, but an additional one Protective shield 54 attached to the carrier 28 by means of eyelets or the like is.

6 again shows a hand tool 10e in the form of an angle grinder shown in a position suitable for separation, but here additionally on the carrier 28 Protective shield 54 is attached, which is not parallel to the carrier runs itself, but at a distance from the first handle 30 in its second position 62 suitable for separation runs parallel to the handle 30.

FIG. 7 shows a hand tool 10f which is used as a drilling machine, Screwdriver or the like is executed. The hand tool 10f has a drill chuck 56 and a pistol-shaped one second handle 38 of the other part of the housing 12 is angled downwards.

The support 28 for the first is on the spindle neck 57 of the housing 12 Handle 30 attached by means of a clamp or the like. The carrier 28 is designed as an approximately L-shaped angle, whose long leg is inclined slightly upwards, so that the first handle 30 from the short leg of the wearer 28 from obliquely upwards towards the housing 12 to one Angle α protrudes from about 10 to 20 ° inclined, whereby the free end 29 just below in the area of the gear housing 16 is located.

Through this arrangement of the first handle 30 in connection with the second pistol-shaped handle 38 one can ergonomically particularly good posture when using the drill achieve what especially in rotary hammer operation, however is also an advantage in screwdriver operation.

The fact that the first handle 30 only at one end is fixed and with its free end 29 towards Projecting gear housing 16 is particularly good damping guaranteed.

Fig. 8 shows a further embodiment of an inventive Hand tool, the total designated with the number 10g is.

The hand tool 10g is designed as an orbital sander, the bracket 28 to which the first handle 30 is attached is from the approximately frustoconical gear housing 16 protrudes from the side and engages with its free End 29 again extends in the direction of the gear housing 16.

On the opposite side of the gear housing 16 is the second handle 38 is set, which here only as Handle knob is formed.

The connecting cord 60 is advantageously integrated on the carrier 28 out, so that it leads away to the side without disability.

Claims (13)

Power-driven hand tool with a housing (12), in which a drive (14) for a tool (26) is added is, with at least a first handle (30) on a Carrier (28) is fixed with a first end (63) is attached to the housing (12) and with a second End (64) protrudes laterally from the housing (12), characterized in that that the carrier (28) at its second end (64) at least one first receptacle (42) for one Attaching the first handle (30) in a first Position (61) has that the first handle (30) with a free end (29) towards the housing (12) protrudes. Hand tool according to claim 1, characterized in that the carrier (28) has at least one second receptacle (44) Fastening the first handle (30) in one to the first Position (61) angled second position (62) having. Hand tool according to claim 2, characterized in that the hand tool (10, 10a, 10b, 10c, 10d, 10e) as an angle grinder formed with an elongated housing (12) is that at its tool end a gear housing (16) with a longitudinal axis (18) of the housing (12) angularly arranged drive spindle (22) for a disk-shaped Tool (26) and that the first (42) and the second (44) receptacle of the carrier (28) is arranged in this way are that the first handle (30) in the first position (61) for roughing and in the second position (62) is positioned to separate. Hand tool according to claim 3, characterized in that the second receptacle (44) is arranged such that the first handle (30) in the second position (62) such that runs through the center of gravity of the hand tool (10a) placed approximately through the middle of the first Handle (30) runs. Hand tool according to claim 2, 3 or 4, characterized in that that the first receptacle 42 is arranged in such a way that the first handle (30) in the first position (61) on the side of the gear housing facing away from the tool (26) (16) near the axis of rotation (24) of the drive spindle (22) runs. Hand tool according to one of the preceding claims, characterized characterized in that a second handle (38) on End of the housing (12) facing away from the tool (26) arranged essentially in the longitudinal direction of the housing (12) and about its longitudinal axis in at least two angular positions is adjustable (39). Hand tool according to one of the preceding claims, characterized characterized in that the carrier (28) with its first End (63) on the housing (12) in different angular positions is noticeable. Hand tool according to claim 7, characterized in that on the housing (12) and on the first end (63) of the carrier (28) interacting locking elements (31, 32) for positive determination of the carrier (28) in different Angular positions are provided. Hand tool according to claim 8, characterized in that a stop (32, 34) to limit the angular position the carrier (28) is provided. Hand tool according to one of the preceding claims, characterized characterized in that the carrier (28) as a damping element is designed for vibration damping. Hand tool according to one of the preceding claims, characterized characterized in that the carrier (28) serves as a protective shield (54) formed area. Hand tool according to one of the preceding claims, characterized characterized in that on two opposite Sides of the housing (12) fastening points (50, 52) are provided for the wearer. Hand tool according to one of claims 1 to 5 or 7 to 12, characterized in that the hand tool (10f) as Drill with a second pistol-shaped handle (38) at the end of the housing (12) facing away from the tool is formed, and that the first handle (30) in the first position opposite one to the axis of rotation (58) Drill chuck (56) perpendicular to a plane acute angle (α) towards the second pistol-shaped Handle (38) is inclined backwards.

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