Abstract:
An electrical tool for planning and/or milling has a motor shaft, a working shaft connected with the motor shaft, wherein the working shaft is positioned perpendicular to the motor shaft.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     The present invention relates to an electrical tool, in particular planning or milling.  
         [0002]     Electrical hand-held planers are already known in the art. With all of these planers, the motor shaft and planer shaft are located parallel to one other, and the main guiding handle is positioned at a 90° angle above these shafts. Due to this arrangement of motor shaft, planer shaft and handle, these known planing devices are poorly suited for machining grooves. Machining edges and lateral surfaces, in particular, is a complicated procedure using planers of this type.  
         [0003]     In addition, routers are known, with which the milling shaft and the motor shaft are located one behind the other in one direction. These devices are guided using one or both hands, and the handles are located parallel to the motor shaft. A considerable amount of effort is also required with these milling machines to machine lateral surfaces and edges.  
       SUMMARY OF THE INVENTION  
       [0004]     Accordingly, it is an object of the present invention to provide an electrical tool for planning or milling, which eliminates the disadvantages of the prior art.  
         [0005]     In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated in an electrical tool for planning and/or milling, comprising a motor shaft; a working shaft connected with said motor shaft, said working shaft being positioned perpendicular to said motor shaft.  
         [0006]     When the electrical tool is designed in accordance with the present invention it has the advantage that a user can very easily machine edges and lateral surfaces, e.g., of doors or windows, using this electrical tool. The user also intuitively handles the tool properly due to the perpendicular arrangement of the working shaft relative to the motor shaft and the resultant shape of the tool. Edges can therefore be easily machined vertically or horizontally.  
         [0007]     The term “motor shaft” refers to the shaft of the electric motor of the electrical tool, via which the electric motor transfers its torque to the working shaft. Depending on the application, the working shaft can also be referred to as a planer shaft, knife shaft, or milling machine shaft. The tool head, e.g., a knife head or milling head, is attached to the working shaft. The working shaft transfers the torque of the electric motor to the tool head. The working shaft is therefore the connecting member between the motor shaft and the tool head.  
         [0008]     The working shaft is positioned perpendicular, e.g., at a right angle, to the motor shaft. The motor shaft and the working shaft therefore form a 90° angle with each other. The motor shaft and the working shaft are preferably interconnected via a gearbox.  
         [0009]     The electrical tool according to the present invention advantageously has a motor housing designed as a handle. This means the user grips and holds the motor housing directly, and guides the electrical tool via the motor housing. As a result, the electrical tool according to the present invention is made smaller and easier to handle. If the motor housing is also oriented in the direction of the feed motion of the electrical tool, the shape of the electrical tool ensures that the user holds and handles the tool correctly, thereby preventing misuse. The direction of the feed motion is the direction in which the electrical tool is propelled when a work piece is being machined.  
         [0010]     The working shaft is preferably supported on one side, thereby resulting in an endless groove depth, e.g., when the tool is used to machine grooves. In this case, the working shaft is supported on the end at which it is interconnected with the motor shaft. The other end of the working shaft is free and can accommodate an appropriate tool head.  
         [0011]     In a further embodiment of the present invention, the electrical tool has a base and a lateral guide surface. The base is a flat section that enables the electrical tool to be placed on the work piece to be machined. The same function is also performed by the lateral guide surface. The surface of the fixed base and the lateral guide surface form a certain angle with each other, thereby enabling both surfaces to be placed—in a form-fit manner—on the corresponding surfaces of an edge of a work piece having a matching shape. The angle between the base and the lateral guide surface can be adjustable, thereby enabling the electrical tool to be adapted for use on different edges of different work pieces. The angle between the base and the lateral guide surface can also be fixed, however. In this case, the angle is preferably 90°, and is therefore a right angle.  
         [0012]     If the angle between the base and the lateral guide surface is fixed at 90°, the lateral guide surface can also have a bezel, and the base can have a V-groove. As a result, despite a fixed angle between the base and the lateral guide surface, a slant can still be bevelled without using any further auxiliary devices, such as adjustable angled stops.  
         [0013]     Preferably, the height of the lateral guide surface is adjustable, thereby allowing the planing or milling width to be equal to the groove width when the tool is used to machine grooves.  
         [0014]     The base can also include a first, fixed base and a second, adjustable base. The second base is therefore movable, thereby enabling adjustment of the depth of penetration of the electrical tool in the work piece to be machined. The second base is preferably adjustable using a rotary knob provided for this purpose.  
         [0015]     It is advantageous if the electrical tool according to the present invention also includes a collecting container for collecting chips. The chips produced during machining of the work piece are then conveyed directly into the collecting container. The chips which are produced are prevented from contaminating the work area and are easily discarded by emptying the collecting container.  
         [0016]     The electrical tool according to the present invention can also have a lateral contact-prevention device. This device serves to cover one end of the tool head, thereby ensuring that a user does not accidentally touch the end of the tool head during operation of the electrical tool, and injure himself. The lateral contact-prevention device is preferably movable—pivotable, in particular—thereby enabling the covered end of the tool head to be accessed as needed.  
         [0017]     In a preferred embodiment of the present invention, the electrical tool is an electrical hand-guided planer. It can also be a milling tool, however.  
         [0018]     The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. the invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0019]      FIG. 1  shows the front view of a first electrical hand-guided planer according to the present invention;  
         [0020]      FIG. 2  shows the back side of the electrical hand-guided planer according to the present invention, per  FIG. 1 ;  
         [0021]      FIG. 3  shows the front view of a second electrical hand-guided planer according to the present invention;  
         [0022]      FIG. 4  shows the back side of the electrical hand-guided planer according to the present invention, per  FIG. 3 ;  
         [0023]      FIG. 5  shows a view of the internal components of the electrical hand-guided planer according to  FIG. 3 ;  
         [0024]      FIG. 6  shows a front view of the electrical hand-guided planer according to  FIG. 3 , on a work piece.  
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0025]      FIG. 1  shows a first electrical hand-guided planer  100 . Electrical hand-guided planer  100  has a motor housing  101 , which serves simultaneously as a gripping surface for the user&#39;s hand. Motor shaft  102  (not shown) is located in motor housing  101 . A front section  103  abuts motor housing  101 . The gearbox of hand-guided planer  100  is housed in this section,  103 . A bearing system for tool heads is also provided in the region of front section  103 . A lower section  105  abuts front section  103 . A working shaft  106  (not shown) is located in lower section  105 . Working shaft  106  is interconnected with motor shaft  102  in front section  103  via the gearbox. A knife head  107  is attached to the lower end of working shaft  106 .  
         [0026]     The lower region of electrical hand-guided planer  100  is composed of a base  108  and a lateral guide surface  104 . Base  108  and lateral guide surface  104  form an angle α with each other, the angle measuring 90°.  
         [0027]     Base  108  is composed of a first, fixed base  109  and a second, movable base  110 . Movable base  110  is adjustable perpendicularly to the plane of the figure, thereby enabling adjustment of the cutting depth of electrical hand-guided planer  100 .  
         [0028]      FIG. 2  shows the back side of electrical hand-guided planer  100 . Collecting container  111  of hand-guided planer  100  is shown in this view. The collecting container can also be referred to as a dust box. A rotary knob  112  is also shown; it enables adjustment of second base  110  and, therefore, the cutting depth.  
         [0029]     The mode of operation of electrical hand-guided planer  100  will be explained below.  
         [0030]     It is assumed that electrical hand-guided planer  100  will be used to plane a right-angled groove in a wood slat. The desired cutting depth of electrical hand-guided planer  100  is first set using rotary knob  112 . To do this, electrical hand-guided planer  100  is placed against the end of the edge of the wood slat in which the groove will be machined. Movable base  110  and the front part of lateral guide surface  104  enclose the edge of the wood slat to be machined in a form-fit manner. In this state, knife head  107  rests against the end of the edge. Electrical hand-guided planer  100  can now be switched on to start the planing process. Electrical hand-guided planer  100  is moved forward in the direction of arrow A (refer to  FIG. 1 ), whereby knife head  107  penetrates the end of the edge. The direction indicated by arrow A can also be referred to as the feed direction of the electrical hand-guided planer.  
         [0031]     Due to the form-fit guidance enabled by lateral guide surface  104  and base  108 , electrical hand-guided planer  100  can be guided securely and accurately along the edge of the work piece. Due to the fact that working shaft  106  is perpendicular to motor shaft  102 , and the fact that motor housing  102  serves simultaneously as a handle, electrical hand-guided planer  100  is easy to hold while it is used to machine edges.  
         [0032]     With electrical hand-guided planer  100 , edges can be easily machined vertically or horizontally.  
         [0033]      FIG. 3  shows a second electrical hand-guided planer  200 . The design of hand-guided planer  200  is basically the same as that of hand-guided planer  100 , although it has a few additional features. Components of hand-guided planer  200  which are identical to those of hand-guided planer  100  are labeled with the same reference numerals.  
         [0034]     Unlike hand-guided planer  100 , hand-guided planer  200  includes a height-adjustment  113  for lateral guide surface  104 . The height of lateral guide surface  104  is adjustable using two pivotable carriers  114 . The user of hand-guided planer  200  can adjust the desired height of lateral guide surface  104  using a rotary knob  115 .  
         [0035]     Hand-guided planer  200  also has a lateral contact-prevention device  116 , as shown in  FIG. 4 . Contact-prevention device  116 , in its position shown in  FIG. 4 , covers lower free end  117  of tool head  107  (refer also to  FIG. 5 ). The user is thereby prevented from accidentally touching lower end  117  of rotating tool head  107  while operating hand-guided planer  200 . Contact-prevention device  116  is pivotable, thereby enabling lower end  117  to be exposed. This allows tool head  107  to be replaced as necessary.  
         [0036]      FIG. 5  shows the internal components of electrical hand-guided planer  200 . Motor shaft  102  is arranged horizontally and is interconnected with vertical working shaft  106  via a gearbox  118 . Motor shaft  102  is part of an electric motor  119 .  
         [0037]      FIG. 6  shows the front of hand-guided planer  200 . In  FIG. 6 , hand-guided planer  200  rests against a slanted work piece  120 . Hand-guided planer  200  will be used to bevel edge  121  of work piece  120 . In this process, a good, secure seat of hand-guided planer  200  on slanted work piece  120  is achieved via a bevel  122  on lateral guide surface  104  and a V-groove  123  of second base  110 . Bevel  122  rests flush against the top surface of work piece  120 , and edge  121  is accommodated by V-groove  123  in a form-fit manner; this ensures simple, reliable bevelling of edge  121 . Thanks to bevel  122  and V-groove  123 , edge  121  can be bevelled without the use of any further auxiliary devices.  
         [0038]     It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.  
         [0039]     While the invention has been illustrated and described as embodied in an electrical tool for planning or milling, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.  
         [0040]     Without further analysis, the foregoing will reveal fully revel the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of the invention.