Electricity: motive power systems – Motor-reversing
Reexamination Certificate
2000-03-02
2001-11-13
Masih, Karen (Department: 2837)
Electricity: motive power systems
Motor-reversing
C388S937000, C310S050000, C173S205000
Reexamination Certificate
active
06316890
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hand-controlled, motor-driven oscillating device as described in the as used in particular as a hand-held grinding device, to the output shaft of which the required tool, such as an abrasive disk, a cutting wheel, saw blades, scraping blades and the like, can be attached as required.
2. Discussion of the Prior Art
Various designs of such oscillating devices are known (cf., for example, U.S. Pat. Nos. 2,350,098, 4,920,702 and DE German reference 94 10 754.8 U1). However, such a device always comprises an elongate casing in which an electric motor and an oscillating unit are arranged in axial succession. An output shaft projects out of the casing of the oscillating unit, to which tools can be attached. A corresponding tool is in this case attached rigidly to the output shaft and, if the output shaft is arranged perpendicular to the longitudinal axis of the device, is always aligned substantially parallel to the longitudinal axis of oscillation, in particular if an abrasive disk or a cutting wheel is being used. The tool cannot adopt any other position with respect to the device, so that the tool attached to the oscillating device is difficult to use in restricted working areas, and indeed this is often impossible, in particular because the grip section of the casing, which is parallel to the working surface, is in the way.
Grinding devices in which the abrasive tool is pivotably connected, via an articulated joint, to a handle or to a linkage leading to an oscillating device, are also known from U.S. Pat. Nos. 4,516,361 and 4,829,719. This makes working inefficient, on the one hand, and uncomfortable and inexact, on the other hand.
SUMMARY OF THE INVENTION
Therefore, the object of the invention is to provide an oscillating device of the above-mentioned generic type which allows comfortable, accurate, and fatigue-free working which is optimum even in restricted working areas.
Consequently, the grip casing section is arranged so that it can pivot, in terms of its angular position, with respect to the oscillating head section together with the device output shaft. As a result, it is possible to adjust the working angle, i.e. the tool attached to the output shaft, for example the abrasive disk, can adopt a different angular position with respect to the grip section and therefore with respect to the hand of the operator, thus allowing easier working which is also less encumbered by obstacles.
In a first, highly advantageous design, the oscillating device, in the zone between the motor and the oscillating unit, i.e. between the grip section containing the motor and the oscillating head section, can be bent away about a transverse pivot axis which is substantially parallel to the machining surface and preferably intersects the longitudinal axis of the device. Consequently, the oscillating head, to which the particular tool, depending on the embodiment, is attached more or less closely via the oscillating device output shaft projecting out of the head, can be pivoted or adjusted in terms of its angle, about a transverse axis, with respect to the remaining grip section. As a result, the position of the grip section, which in this case is at the same time the motor section of the device, with respect to the oscillating head part bearing the tool, can be changed in such a way that it can be moved, for example, into a position of 45° or 90° with respect to the working surface. The tool/oscillating device combination thus takes up significantly less space when working and can be used even in restricted areas and relatively inaccessible locations. The fact that the working angle, i.e. the angle between the grinding surface and the grip section of the device, can thus be optimally adjusted makes it possible to work more comfortably, more accurately and therefore with less fatigue.
According to a refinement of the inventive concept, an element which transmits the rotary movement at an angle, e.g. a universal joint, is provided on the motor output shaft in the area of the pivot axis. Furthermore, it is advantageous if the shaft which leads from the universal joint is a telescopic shaft, so that the rotating drive movement of the electric motor can be transmitted virtually unchanged to the oscillating unit provided in the head section, unaffected by the corresponding angular setting of the oscillating head section.
In order to allow an optimum unimpeded pivoting or adjustment movement between the two sections of the device, the two sections are interrupted and, if appropriate, spaced apart, in terms of their casing, in the pivot axis zone, the two sections being connected to one another by means of at least one pair of pivot arms. These pairs of pivot arms may be lateral lugs on the respective casing sections, i.e. may be formed integrally with the sections, in which case only a partial interruption is present. However, the respective casing sections may also end smoothly at their end sides, from each of which a pivot arm which is embedded in the casing wall material or is fixedly connected thereto projects. This ensures robust, fault-free pivoting.
It is advantageous if the pivoting movement of the two device or casing sections with respect to one another can, if appropriate, take place freely or if this can be effected at predetermined angular positions, e.g. at 10° intervals. The corresponding angular position can be fixed, so that it is possible to work safely, in a known way, for example by means of spring latching fixtures or other latching features, which are released by the application of a suitable pivot force or by means of a latching button which can be actuated from the outside. Consequently, the adjustment can be effected very quickly and without problems in a simple manner according to the required angular position of the oscillating head section with respect to the grip section.
It is advantageous if the two casing sections, namely the oscillating head section and the casing of the grip section, at their end sides, are at a distance from one another and a flexible casing section, e.g. a bellows, is arranged between the two end sides. This allows an unimpeded pivoting movement combined with simultaneous correct functioning of the moving parts, in particular the rotating parts, such as the motor shaft and universal joint, while at the same time providing a pleasant appearance.
According to a further highly advantageous fundamental embodiment of the invention, a separate grip section is provided, which is pivotably attached to the drive casing which contains the drive motor and the oscillating unit. In this case, the power can be supplied via the grip section, and a corresponding switch may be provided on the latter. Since the drive casing and the grip section are in practice two separate parts which are simply pivotably connected to one another by means of an articulated joint, it is possible to make the drive casing smaller and more sturdy. In this case, the motor, the oscillating unit and the output shaft are arranged axially in succession and in an axial alignment in this drive casing, specifically in such a way that the common axis is perpendicular to the machining surface, particularly in the case of grinding using the end side of an abrasive disk.
The grip section may be connected to the drive casing in two advantageous arrangements. However, the pivot bearing, comprising, for example, a bearing block which is attached to or formed integrally on the drive casing and a grip-section bearing fork, or vice versa, is always designed in such a way that pivoting through at least 90° is possible, i.e., as seen in the working position, for example out of a position in which the grip section is parallel to the working surface into a position which is perpendicular to the first position.
For example, the grip-section pivoting attachment may be provided at the drive casing perimeter, i.e. in a radial alignment. However, it may also be provided at the top end side of the casing, axially opposite to the device
Cohen & Pontani, Lieberman & Pavane
Masih Karen
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