EP1894680B1 - Electric hand tool - Google Patents

Abstract

The device has a drive housing connected with a motor housing (10), where the motor housing is formed into two half shells (12), which run in longitudinal direction of the device. The half shells are connected with each other by a clamp (18) running in the longitudinal direction and fixed against each other by the clamp. A handle (30) is provided at a machine housing. The drive housing and the clamp are made of aluminum. The half shells of the motor housing and/or shells of the handle are made of plastic.

Description

The invention relates to an electric hand tool, in particular drill, screwdriver, hammer drill or percussion drill with at least optionally rotating drive a recordable in a tool holder tool with a motor housing and a separate thereof connected to the motor housing gear housing, wherein the motor housing is formed of two half-shells, in a running in the longitudinal direction of the electric power tool device, the electric hand tool device substantially lie in two symmetrical halves dividing plane with their side edges against each other, and wherein the machines, or. Motor housing is provided a handle. A corresponding structure has been known for many years in power hand tools, wherein the plane in which the half shells abut each other divides the machine substantially into right and left halves in the usual position of use.

The two half shells lie against each other along their side edges. In referring to the tool holder end of the gear housing connects to the motor housing and is connected thereto. It is customary here to fix the two housings together by means of a screw connection.

The two housing shells of the motor housing are usually also connected to each other via screw. A corresponding design shows the DE 1944660 A1 ,

The invention now has the task of providing an electric hand tool device with an alternative attachment of the half shells of the motor housing.

The object is achieved by a generic electric hand tool, wherein the two half-shells are fixed by a bracket extending in the longitudinal direction against each other. The bracket engages over the mutually abutting side edges of the half-shells and connects them in particular by means of a clamping, ie non-positively, with each other. In general, however, other, for example, latching, connection types are conceivable. However, in order to minimize the play between the housing halves, a frictional connection is preferred. These are on the bracket holding and locking means provided, which cooperate with corresponding holding or locking means on the side edges of the half-shells. In particular, ribs or beads may be provided in the region of the side edges of the half-shells, which are in clamping contact with ribs or beads or the side walls of the bracket and are preferably overlapped by the latter. As a bracket is understood to be a flat or curved, in particular cambered material having a longitudinal extent which is much larger than its width, the height may vary over the length. However, the bracket always has a band-like shape. In addition, the half shells of the housing and the handle can also be screwed together.

In addition, the motor housing can be fixed to the gear housing by means of the bracket. For this purpose, the bracket in the connecting region between the two housings connecting elements and allows a fixation on the transmission housing such that the motor housing is placed with its half shells firmly against the corresponding edge of the gear housing and it comes to a play-free contact of the two housing parts. For this purpose, it may be provided that the bracket is fixed to the transmission housing by means of a screw connection. This has the advantage that the attachment then does not have to be in one or both half shells, which are usually made of plastic, making these components are difficult to manufacture in the injection molding process, but in the manufacturing technology simply designed bracket, the more stable and preferably due to its clamping function Metal is formed.

It can be provided particularly advantageous that the bracket, the motor housing in the region of each other completely encloses adjacent side edges of the half-shells. In this way, a secure pressing is achieved over the entire length of the abutting side edges and at the same time by the both side edges enclosing bracket prevents penetration of dust, etc. in the motor housing. In addition, a particularly beautiful attractive appearance can be achieved by this arrangement. Furthermore, a seal can be made in the region of the overlap of the bracket on the side edges, so that the tightness can be further increased. The bracket can be pushed from the transmission housing end facing away from the motor housing in the longitudinal direction.

Furthermore, it can be provided that also the handle is formed double-shelled and in particular each shell of the handle is integrally connected to a half-shell of the motor housing. Such a production offers the advantage that the half-shells with the half-shells of the handle can be made together, for example by injection molding of a plastic material. The necessary number of parts in an electric hand tool for the housing can be reduced and in particular the assembly cost is reduced.

Furthermore, it can be provided that the bracket connects the handle to the motor housing, if no one-piece design is provided.

It may be provided in both cases that the shells of the handle are connected to each other by the bracket. In this case, the bracket encloses the side edges of the shells of the handle at least on one side of the handle and preferably presses them together. This can be on the hanger and on the shells of the handle in turn be provided clamping elements. Alternatively, a detent connection is possible.

It may further be provided that the bracket, which covers the handle on one side, is then continued visually in the direction of the gear housing by a handle protection, which is designed as a separate component, so that a bow-like handle of the optics results in the part of the bow is formed by the bracket on the handle, in the area of switches, etc. may be provided and the sheet then extends in the direction of the transmission housing, so that the hand, which surrounds the handle through this further Part of the arch is protected. The bow can be visually appealing to reach a pointing in the direction of a tool end of the gear housing. Preferably, the bracket and the handle protection are made of the same material and / or in the same color.

Particularly preferably, however, it can be provided that the handle is arranged in the center of gravity of the electric hand tool device. Such a design already results from the DE 10 204 003 027 B3 , which describes an electric hand tool device, wherein the handle in the use position on the upwardly facing housing side is attachable and wherein the handle is inclined so that its free end points in the direction of the tool holder. In particular, if the handle is in the center of gravity of the machine tool, there is the advantage that z. B. the machine can be created with its pioneering from the tool holder part of its motor housing against the forearm of a user and can serve as a forearm support. In addition, such a design has the advantage that the arrangement of the handle in the center of gravity is a particularly good Balancing the tool is given, and so tilting of the tool while working can be largely prevented. The support and support work of the user is reduced.

In particular, if the handle is inclined in the direction of the male tool, in addition there is the advantage of an ergonomic hand position of the machine, in particular if operated with upwardly facing handle, this position should be referred to as a use position; in contrast to the pistol-like holding and use position in conventional electric hand tool devices of this type. Tilting of the tool can be avoided and force that would normally be needed to stabilize the electric hand tool, can now be applied directly to work or fatigue is much lower ,

In addition, an arrangement in the center of gravity, in particular with an upwardly inclined handle, makes it easier to pick up the machine, and in particular to pick up the machine with one hand, whereby the wrist is less stressed because no rotational movement has to be carried out.

According to a preferred embodiment it can be provided that the handle is at such an angle to the longitudinal axis of the electric hand tool device, which is in particular formed by the drive axis in extension of the tool holder and the tool, that between a longitudinal axis of the forearm of an operator and the tool longitudinal axis Angle between 5 ° and 30 ° and in particular between 10 ° and 20 °.

It can also be particularly preferred that the extension of the longitudinal axis of the electric hand tool device coincides with the extension of the longitudinal axis of the forearm of an operator in the region of the tool, in particular in the region of the free tool tip. D. h., The two lines of action preferably intersect in the area of the tool tip, whereby a particularly favorable application of force and at the same time a particularly accurate work can be achieved.

It can also be provided that one or more storage surfaces for depositing the electric hand tool device are provided on the underside of the electric hand tool device in the use position. In this way it can be achieved that in a stored electric hand tool this can be raised directly in the use position and not only a tilt of the lying electric hand tool, which rests in particular on one of the two half-shells of the motor housing, must be done before work can begin. In this way, the wrist of the user is further spared. In particular, a one-handed recording can take place and there is no second hand for correct positioning in the use position z. B. needed for a drilling operation. For this purpose, it can be provided, in particular, that a flattening is provided in the region of the bracket, on which the electric hand tool device can be set up.

It can also be provided that a second auxiliary handle for a two-hand operation can be attached. This second handle can be mounted in a conventional manner viewed from the tool side after the tool holder and, for example, via a clamp, which is a corresponding point behind the tool holder of a Tool is provided, set on the electric hand tool and fixed there.

In addition, it can be provided that the gear housing and / or the bracket is made of aluminum. This may in particular be a housing made of die-cast aluminum and a bracket made of the same material. By a corresponding metallic gear housing, the life of the machine can be increased. The machine is then on the one hand more robust and derives the other resulting heat in the gearbox better.

Furthermore, the provision of a bracket made of die-cast aluminum increases the value of the machine and in particular improves the visual appearance.

The half shells of the motor housing and / or the shells of the handle may be made of plastic. It can be provided that actuators, such as switches, etc., are provided in the region of the plastic housing of both the half-shells or the handle. To improve the appearance and the value of the machine may further be provided that carbon fiber applications are appropriate, which can cover in particular the visible areas of the half shells of the motor housing.

Overall, it can be provided that the bracket is provided as a flat only slightly over the half-shells uplifting bracket over approximately the entire circumference. However, areas may also be provided in which the bracket, inter alia, to further improve the design of the device is further apart from the half-shells.

In particular, it can be provided that the plastic housing or the lining made of carbon fiber, which may be provided in particular in the region of the transmission housing, stands out in terms of color in harmonious manner from the die-cast aluminum of the transmission housing and the bracket.

Figur 1

ein Motorgehäuse eines Elektrohandwerkzeuggeräts;

Figur 2

einen Schnitt entlang der Linie A-A und

Figur 3

einen Schnitt entlang der Linie B-B in Figur 1.

Further advantages and features of the invention will become apparent from the remaining application documents. The invention will be explained in more detail below with reference to a drawing. Showing:

FIG. 1

a motor housing of an electric hand tool device;

FIG. 2

a section along the line AA and

FIG. 3

a section along the line BB in FIG. 1 ,

FIG. 1 shows a motor housing, which is provided in its entirety by the reference numeral 10. The motor housing 10 is in this case formed of two half shells 12 and 14, which consist of a plastic material and were produced by injection molding. The two half-shells 12 and 14 are connected to each other via a tongue and groove connection 16. In order to prevent inadvertent release of the two half-shells 12 and 14 from each other, a bracket 18 is provided, which makes a clamping of the two half-shells 12 and 14 against each other, for which purpose on the half-shells 12 and 14 as clamping means ribs 19 and 20 are provided engage in recesses 21 and 22 of the bracket 18, wherein the side walls of the recesses form corresponding clamping means and are arranged so that the two ribs are loaded to each other and so it to a clamping of the half shells 12 and 14 in the upper region of a power hand tool comes. In the lower region of the motor housing, two ribs are also provided, which are designated by 23 and 24, which are not spaced apart, but in the area directly the tongue and groove guide is provided. Again, there is a pressing against each other of the two ribs 23 and 24 by clamping means on the bracket 18th

The bracket 18 is in this case completely circumferentially formed around the motor housing in the region of the mutually abutting side edges of the two half-shells 12 and 14th

Furthermore, a handle 30 is provided, by means of which the electric hand tool device can be guided by an operator.

The handle 30 is in the normal operating and receiving position of the machine at the top thereof in the region of the motor housing, where this in the transmission housing (not shown) passes arranged. This point is essentially the center of gravity of the handheld power tool. In this way, a balanced energy-saving and fatigue-free working can be guaranteed. The handle 30 is slightly inclined in the direction of a tool holder, not shown, to improve the ergonomics. The bracket 18 also extends over one side of the handle 30 and clamps the two shells of the handle 30, which are marked with 31 and 32 and are also connected to each other via tongue and groove connections, by side members 34 and 35, which are the clamping elements of the bracket 30 in this area form, against each other. On the side facing away from the bracket 18 of the handle 30 switches 36 are provided for the operation of the electric power tool.

In this case, the bracket 18 is essentially a flat circumferential band, only in the region of the rear edge of the motor housing, a widening 37 is provided to increase a footprint of the electric hand tool device and lead an electric cable.Dabei can be provided that the Hanger has a base 40 on its underside. For this purpose, the bracket 18 may be flattened in this area. Incidentally, the bracket may be cambered, so that an attractive appearance is achieved. On the stand 40, the electric hand tool device can be placed so that no dropping on the side surfaces of the half-shells 12 and 14 is necessary. A first pivotal movement and access with a second hand to bring the machine in a use position are then not required.

In addition, it can be provided that ventilation openings 42 are provided in the motor housing.

According to a particularly preferred embodiment, the visible areas of the motor housing are covered by carbon fiber applications 43 and 44, which give the machine or the electric hand tool device a high-quality appearance.

The connection to the transmission housing can be effected in a conventional manner, wherein the connecting elements are provided in the bracket 18 and the transmission housing.

Furthermore, it can be provided that the bracket 18 on the handle 30 at its free end with a corresponding further bracket member (not shown) cooperates, which serves as a handle guard and the other end is fixed to the gear housing.

Claims (11)

1. Electric hand tool appliance, in particular a drill, screwdriver, hammer drill or impact drilling machine, with at least optionally rotating driving of a tool which can be received in a tool holder, and with a motor housing (10) and a transmission housing which is separate from, but connected to, the latter, wherein said motor housing (10) is formed from two half-shells (12, 14) which abut against one another by their lateral edges in a plane which extends in the longitudinal direction of the electric hand tool appliance and essentially divides said appliance into two symmetrical halves (12, 14), and wherein a handle (30) is provided on the motor housing (10), characterised in that the two half-shells (12, 14) are connected to one another by a clip (18) that extends in the longitudinal direction and are secured in position against one another by said clip (18).
2. Electric hand tool appliance according to claim 1, characterised in that the clip (18) completely encloses the motor housing (10) in the region of those lateral edges of the half-shells (12, 14) which abut against one another.
3. Electric hand tool appliance according to claim 1 or 2, characterised in that the handle (30) is of two-shell construction and, in particular, each shell (31, 32) of said handle (30) is connected, in one piece, to a half-shell (12, 14) of the motor housing (10) and the clip (18) connects the shells (31, 32) of the handle (30) to one another.
4. Electric hand tool appliance according to one of claims 1 to 3, characterised in that the clip (18) connects the handle (30) to the motor housing (10).
5. Electric hand tool appliance according to one of the preceding claims, characterised in that the handle (30) is arranged in the centre of gravity of the electric hand tool appliance.
6. Electric hand tool appliance according to one of the preceding claims, characterised in that the handle (30) is secured in position on the motor housing (10) in the region of the connection to the transmission housing.
7. Electric hand tool appliance according to one of the preceding claims, characterised in that the handle (30) is inclined in the direction of the tool which is to be received.
8. Electric hand tool appliance according to one of the preceding claims, characterised in that, in the position of use, the handle (30) is arranged on the upper side of the electric hand tool appliance.
9. Electric hand tool appliance according to one of the preceding claims, characterised in that it is possible to attach a further additional handle for a two-handed operation.
10. Electric hand tool appliance according to one of the preceding claims, characterised in that the transmission housing and/or the clip (18) are made of aluminium.
11. Electric hand tool appliance according to one of the preceding claims, characterised in that the half-shells (12, 14) of the motor housing (10) and/or the shells (31, 32) of the handle (30) are made of plastic.

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