CN1958242A - Power tool - Google Patents

Abstract

The invention relates to an electric power tool with a rechargeable battery (10) arranged in a receiving housing (11) and a plug-in tool driven in rotation and/or impact by a transmission (14) arranged in the housing The driver (13) in the body (12), and has a handle (15), which is connected to the housing (12). The invention proposes that at least the receiving housing (11) of the accumulator (10) is connected to the housing (12) via a vibration damper (16).

Description

electric machine tool

technical field

The invention relates to an electric power tool according to the preamble of claim 1 .

Background technique

In order to enable cable-free operation, some hand-held power tools are known to be powered by a battery or a so-called battery pack (Akku-Pack). Usually the accumulator or the accumulator block is attached to the electric power tool via a locking connection. The electrical contacting of the accumulator takes place via a contact holder. Usually the contact holder is mounted elastically in order to damp vibrations during operation of the electric power tool. Especially with battery-operated hammer drills, the hammer mechanism causes such strong vibrations of the machine tool that the elastic mounting of the contact holder alone is not sufficient to sufficiently decouple the vibrations. Due to the vibration behavior of the respective power tool, unpleasant vibrations still occur, especially in the region of the handle. This vibration will cause rapid operator fatigue and lead to a reduction in holding force. The health of the operator is at risk especially when working for long periods of time, for example when working on a grinding machine tool. Furthermore, in battery-operated electric power tools, vibrations can also have a negative effect on the contacting of the battery. In order to avoid burning of the contacts, the contacts according to the prior art are provided with a special coating. The problem in this case is that the coating wears down over time due to vibrations and loses its effect.

Contents of the invention

In a battery-operated electric power tool according to the invention having a rechargeable battery arranged in the housing and a driver arranged in the housing, at least the receptacle housing for the rechargeable battery is connected to the housing via a vibration damper . In this case, vibrations can advantageously be avoided and the overall vibration of the power tool reduced by an advantageous mass distribution between an impact mechanism on the one hand and a damper mass on the other hand, wherein the damper mass is at least composed of a battery, Handle, possibly electronics and/or a drive. It can also be provided that only the accumulator is decoupled from other masses in order to protect the accumulator against vibrations in particular. In a preferred variant it can also be provided that the accumulator and the handle are decoupled from other masses. An advantageous need-based setting can thus be achieved. By decoupling the battery from the handle, vibrations acting on the user's hands, arms and shoulder area can be reduced. Overall, the electric power tool according to the invention advantageously increases operating comfort, since the user is protected against vibrations when the user holds the power tool on the rechargeable battery and on the handle. Furthermore, the technical outlay for forming the battery and the battery compartments in a vibration-resistant manner can be expediently reduced. Furthermore, an advantageous guiding strength of the entire machine tool is achieved.

In an advantageous refinement, the vibration damper is arranged in such a way that a first mass part can be completely or at least partially decoupled from a second mass part, wherein the accumulator is assigned to one of the two mass parts one. Advantageously, variations can be made in the individual components assigned to the mass part in order to achieve a needs-dependent adaptation. In this case, in the first variant, the accumulator forms the first mass part, while at least the drive and transmission as well as the handle form the second mass part. In a further variant, the handle can also optionally be integrated into the first part mass, whereby the battery and the handle are decoupled as a unit from the second part mass. A particularly advantageous mass distribution is thus achieved. Considerable cost savings can be achieved through the combination of the battery and the vibration damper for the handle. Particularly preferably, the vibration damping element is formed in one piece.

Advantageously, the mass part is arranged in such a way as to support vibration damping. The accumulator and all components, such as a contact holder which contacts the accumulator, are thus protected against vibrations. In particular, a contact holder for contacting the battery can be integrated into the receiving housing.

Due to the vibration-protected contact holder, the risk of burning of the contacts, which occurs according to the prior art when their coating is worn, is advantageously reduced. Advantageously, the battery and its components, in particular the battery compartment and the compartment connection as well as the contact holder, can be implemented in a simple and cost-effective manner by means of the vibration damping according to the invention. Furthermore, the invention brings about time and cost savings in the new development of batteries and contact holders. Overall, this avoids the multiple preliminary tests that have hitherto been necessary to ensure the suitability of the battery and the contact holder for hammering.

One of the two mass parts can be arranged significantly larger than the other. In a preferred embodiment, the first mass part can optionally be made as large as possible. In particular, the first mass part can be enlarged by machine-tool-specific, combinable components. For example, the first mass part can be enlarged by installing a charger and its components in the handle or by electronic devices for controlling commutatorless drives. In drives with a commutator, the commutator can also be protected against vibrations, which has a favorable influence on the speed behavior and achieves a longer service life of the carbon brushes/slip rings. As an alternative to this, provision can also be made for the second mass part to be as large as possible, for example by combining machine-tool-specific, combinable components, whereby a high mass can be achieved and vibration possibilities are provided if required.

The shock absorbing member may consist of a rubber member. However, other materials or known spring dampers are also conceivable, such as spring suspensions and structural dampers, which result in vibration damping. An active damper can also be provided as vibration damper. Furthermore, it is also possible to combine individual cushioning elements within one power tool.

Optionally, an unlocking device, for example an unlocking key for a battery, can be damped and/or decoupled via the vibration damper, provided that the unlocking device is arranged on the power tool side. In this case, the unlocking device can advantageously be integrated into the damping part.

It can also be provided that the unlocking device is integrated into the receiving housing of the battery.

Overall, a simple, efficient and cost-effective vibration damping can be achieved with the electric power tool according to the invention, which is especially suitable for a hammer drill with a battery or a battery charger or an electronic system connected to an EC motor.

Description of drawings

Further embodiments, aspects and advantages of the invention can be obtained independently of their generalizations in the claims and without limitation in generality from the exemplary embodiments of the invention described below with reference to the drawings.

The following figures represent:

FIG. 1 shows a preferred embodiment of a battery-powered electric power tool according to the invention,

Fig. 2 is an alternative embodiment, the individual components have a particularly preferred mass distribution, and

Fig. 3 is another alternative embodiment.

Detailed ways

In the drawings, the same components are denoted by the same symbols.

FIG. 1 schematically shows a battery powered electric machine tool. The housing 12 is divided into a housing part 12a and a housing part 12b, wherein a drive 13 is arranged in the housing part 12a and a transmission 14 is arranged in the housing part 12b. An insert tool (not shown) is driven rotationally and/or impactally via the transmission. All components of drive 13 and transmission 14 are arranged in a known manner and are not described again for the sake of clarity. Their mode of operation is well known to the skilled person and will therefore not be described in detail.

A receiving housing 11 is provided for receiving the accumulator 10 . A contact holder 20 is provided for electrical contacting of the battery 10 . A handle 15 is connected to the housing part 12a. According to the invention, the receiving housing 11 of the accumulator 10 is connected to the housing 12 via a vibration damper 16 . The vibration damper 16 is designed as a rubber part, which leads to a damping of the battery 10 . An unlocking device 19 for battery 10 is provided on the power tool side, wherein unlocking device 19 is damped and/or decoupled by vibration damper 16 and thus integrated into the damping part.

FIG. 2 shows an alternative embodiment of an electric power tool according to the invention in the form of a battery-powered hammer drill with a percussion mechanism 21 . At least one drive 13 and one transmission 14 are arranged in a housing 12 . The drive 13 and the transmission 14 are components of the first mass part 17 . A handle 15 is connected to the housing 12 . A storage battery 10 is arranged in a receiving housing 11 connected to a housing 12 . A contact holder 20 is also provided for contacting the battery 10 . An unlocking device 19 for battery 10 is provided on the power tool side, which unlocking device is integrated into receiving housing 11 for battery 10 . The accumulator 10 and the handle 15 are components of the second mass part 18 .

The handle 15 and the receiving housing 11 are connected to the housing 12 through a shock absorber 16 . In this case, the vibration damper 16 is in particular arranged such that the first mass part 17 and the second mass part 18 can be decoupled. In this case, the mass parts 17 , 18 are arranged in such a way that vibration damping is supported. Due to the resulting favorable mass distribution, an optimal vibration damping can be achieved, so that the user is protected as far as possible from vibrations when he holds the hammer drill on the accumulator 10 and on the handle 15 .

In this case, the first mass part 17 is selectively designed to be as large as possible and can be enlarged by combining other machine-tool-specific combinable components, for example a charger (not shown) or the like.

The shock absorber 16 is integrally formed by a rubber part, which leads to a damping of the battery 10, the handle 15 and other electronic components. Furthermore, other components arranged on the power tool side, such as for example the unlocking device 19 , can also be protected against vibrations.

FIG. 3 shows another alternative embodiment of a battery-operated electric power tool according to the invention, the structure of which essentially corresponds to that of FIG. 2 . Reference is therefore made to the above-described exemplary embodiments in order to avoid repetition. In contrast to FIG. 2 , in FIG. 3 the accumulator 10 and the handle 15 are formed as a common component, for example also as a one-piece component. As a result, although there is no decoupling between the battery 10 and the handle 15 , the battery 10 and the handle 15 can be decoupled as a unit from other components. This provides a further possibility of conversion in order to achieve a needs-dependent adaptation.

Claims (15)

1. Electric power tool, with a storage battery (10) arranged in a receiving housing (11) and a plug-in tool driven rotationally and/or impactally by a transmission (14) arranged in a housing (12) in the driver (13), and has a handle (15), the handle is connected with the housing (12), it is characterized in that: at least the containing housing (11) of the accumulator (10) passes through a vibration The buffer (16) is connected with the housing (12). 2. The electric power tool according to claim 1, characterized in that the vibration damper (16) is arranged such that a first mass part (17) can be decoupled from a second mass part (18), wherein The accumulator (10) is assigned to one of the two mass parts (17, 18). 3. The electric power tool as claimed in claim 2, characterized in that the handle (15) is decoupled from the second mass part as part of the first mass part (17). 4. The electric power tool as claimed in claim 2, characterized in that the handle (15) is decoupled from the first mass part (17) as part of the second mass part (18). 5. The electric power tool as claimed in claim 1, characterized in that the mass part (17, 18) is arranged in such a way that it supports vibration damping. 6. The electric power tool as claimed in one of the preceding claims 2 to 5, characterized in that the first mass part (17) is selectively designed to be as large as possible. 7. The electric power tool as claimed in one of the preceding claims 2 to 5, characterized in that the second mass part (18) is selectively designed to be as large as possible. 8. The electric power tool according to one of the preceding claims 2 to 4, characterized in that the first mass part (17) or the second mass part (18) and/or the accumulator (10) are supplied by a machine-specific, Combinable parts to grow. 9. The electric power tool as recited in one of the preceding claims, characterized in that the vibration damping element (16) is embodied in one piece. 10. The electric power tool as recited in one of the preceding claims, characterized in that the vibration-damping element (16) is formed by a rubber element. 11. The electric power tool as recited in one of the preceding claims, characterized in that the vibration-damping element (16) is formed by a spring element. 12. The electric power tool as recited in one of the preceding claims, characterized in that an active damping element is provided as the vibration damping element (16). 13. The electric power tool as recited in one of the preceding claims, characterized in that an unlocking device (19) for the battery (10) is provided on the power tool side. 14. The electric power tool according to claim 10, characterized in that the unlocking device (19) is damped and/or decoupled by the vibration damper (16). 15. The electric power tool as recited in claim 10 or 11, characterized in that the unlocking device (19) is integrated into the receiving housing (11) of the battery (10).

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