JP5108185B2 - Hand-held power tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a hand-held control-type electric tool, particularly an end face cutting tool or an electric planer, which includes a base having a reference surface and a cutter head that is driven to rotate by at least one cutter. The engaging surface of this type relates to a type in which the cutting depth is defined in relation to the reference surface.
[0002]
[Prior art]
Eccentric grinders, vibration grinders and belt grinders are used to process flat wood surfaces, in particular to remove paint and similar coatings mechanically. These tools work with geometrically indeterminate cutting edges, such as agglomerated abrasive grains. Processing with these tools is time consuming and requires a large amount of abrasive. Furthermore, it is impossible to send out the material thickness that has been cut off in a limited manner. Only belt grinders with an additional grinding frame offer such a possibility. Grinding waste generated during grinding is inhaled by the tool operator and is fine enough to settle in the stomach, which is detrimental to health. It is therefore necessary to wear a respiratory protection device or to provide the tool with a dust suction device, which is very expensive.
[0003]
Tools with geometrically defined cutting edges are also used for removing the surface coating. Such a tool is known from German Offenlegungsschrift 19 543 392. In this known specification, a motor-driven hand-held tool in the form of an end-face cutting tool is described, and this hand-held tool is provided with a cutter as cutting means on the end face of a rotating cutter head. This clearly reduces the machining time and wear of the grinding means for the tool. Since most of the chips are removed, there is very little generation of fine dust. When machining a surface with such an end face cutting tool, the cutting tool directly engages the surface as soon as the tool is placed on the surface. Such tools have the disadvantage that often the wrong surface treatment is often performed, similar to damage. This is the case, for example, when the driving machine is removed. Moreover, if the machine is suddenly placed unintentionally, the cutting cutter may be damaged by an impact load. Furthermore, these tools can only be operated in a plane open in the lateral direction. In this case, the guide surface of the end face cutting tool must first be placed on the edge and then guided onto the surface to be machined. Only then is the cutting tool engaged with the surface to be machined. When a tool is placed on the surface from above, a tool that rotates at high speed often damages the surface at the moment of loading.
[0004]
The same problem exists in hand-held electric planes that work with adjustable cutter feed. This hand-held electric plane also has a geometrically defined cutting edge. When a hand-held electric planer is placed on the surface and additionally moved in the feed direction, the normal stop aid is folded and the surface to be processed is accidentally damaged.
[0005]
[Problems to be solved by the invention]
The object of the present invention is to eliminate the drawbacks of the prior art.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has an approach control unit, and the depth of cut is minimum and maximum equal to zero using the approach control unit against the force, particularly the force of the spring. It was made possible to change between values.
[0007]
【Effect of the invention】
The electric power tool of the hand-held control type according to the present invention having the configuration according to claim 1 has the advantage of preventing the workpiece surface from being damaged by unintended or uncontrolled removal of the electric tool. . Furthermore, it facilitates entry into the surface of the tool.
[0008]
If no force is applied to the entry control, the cutting depth is equal to zero because the tool does not protrude beyond the reference plane. Even if the cutter head rotates, the cutter does not contact the surface to be processed. Only when a force is consciously applied to the access control by the operator, the tool projects beyond the reference plane until the depth of cut reaches the maximum value. The slow protrusion of the cutter causes the tool to slowly enter the surface to be machined. At the same time that the work vehicle stops applying force to the entry control unit, the cutter returns to the original position, and the cutting depth returns to the zero value. In this state, the cutter no longer engages the surface of the workpiece to be machined.
[0009]
It is advantageous if the approach control moves the cutter head rotating about the vertical axis along this vertical axis. Thereby, an approach control part is formed in the end face cutting tool.
[0010]
Furthermore, it is advantageous if the cutter head is coupled with a grip protruding beyond the base, the grip being fixed with respect to the cutter head, slidable with respect to the mechanical base and on the vertical axis. is there. As a result, the entrance control part is formed very easily and the operator can operate it very easily.
[0011]
It is particularly advantageous that the depth of cut can be defined by a stopper between the grip and the substrate. The maximum depth of cut at which the entry controller is pressed by the user is determined by the sliding of the stopper and the connection and fixing of the stopper. Such a configuration is very simple and inexpensive to produce, yet nevertheless provides very great mechanical stability and safety.
[0012]
In another advantageous configuration of the invention, the cutter head rotates about a horizontal axis, the reference surface is slidable relative to the substrate, and the substrate has a guide surface. Thus, it is possible to form an entry control unit in a hand-held electric plane. When the movement of the electric plane and the pressing to the approach control unit are performed at the same time, the reference plane moves in relation to the cutting circle of the cutter head, so that the minimum value when the cutting depth is not loaded, that is, zero To the maximum value. At the same time as the pressing force to the approach control unit is lost, the reference surface moves again to the starting position, and the reference surface is located outside the cutting circle of the cutter head. This ensures that the surface is processed only by deliberate pressing on the entry control.
[0013]
It is particularly advantageous that the reference surface is formed on the slide shoe and that the slide shoe is movable along the inclined surface of the substrate. As a result, the force applied to the approach control unit can be used for moving the electric plane at the same time. Thus, the user can move the electric plane much more easily and with less power consumption. This is useful for tool operability.
[0014]
It is particularly advantageous that the depth of cut can be defined by a movable and fixable stop in the substrate. Such a stopper can be formed into a tool very simply and inexpensively and nevertheless provides excellent mechanical safety.
[0015]
It is particularly advantageous if the substrate has a protective casing, which is arranged around the cutter head. This ensures adequate lateral protection and reduces the risk of injury to the tool operator to almost zero.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0017]
FIG. 1 shows a hand-held power tool 1 in the form of an end face cutting tool with a rotating cutter head 7. The cutter head 7 is fixedly coupled to the drive shaft 5. The drive shaft 5 is driven via means known per se. For example, it is driven by a schematically shown drive motor 11 and a belt drive unit 12 having a belt wheel 6. However, these are not the essence of the present invention and will not be described in further detail. The drive shaft 5 rotates about the vertical axis 9. The end face cutting tool has a base body 10 which surrounds the cutter head 7 in the radial direction in the form of a protective casing 13. The cutter 2 is disposed on the cutter head 7 on the side opposite to the base body 10 in the axial direction. The cutter 2 protrudes from the cutter head 7 both in the axial direction and in the radial direction. During the rotation of the cutter head 7, the cutter 2 defines a cutting circle. The drive shaft 5 is supported via a needle bearing 8 in the machine casing 10. The drive shaft 5 is supported at its free end via a ball bearing 17 in the bowl-shaped portion 18. The pot-shaped portion 18 is fixedly coupled to the end portion of the grip 3. The grip 3 has a head 19 protruding from the mechanical casing 10. A stopper 15 is fixedly coupled to the machine casing 10 between the machine casing 10 and the head 19 of the grip 3. Between the machine casing 10 and the head 19 of the grip 3, a spring 4 surrounding the lower part of the grip 3 is arranged. The spring 4 presses the grip 3 in a direction away from the mechanical casing 10. The strength of the spring 4 is such that the cutter 2 is completely received in the protective casing 13 in the axial direction when no force is applied to the grip 3. In this case, a very simple entry control part is formed by the grip 3, the spring 4 and the bowl-shaped part 18.
[0018]
FIG. 2 shows the hand-held power tool 1 with the cutter 2 protruding. The configuration of the electric power tool 1 is the same as that of the electric power tool shown in FIG. The state shown in FIG. 2 is achieved by applying a force F to the approach control unit 16 in the axial direction via the grip 3. As a result, the grip 3 moves downward against the spring force of the spring 4. Thereby, the bowl-shaped part 18 fixedly coupled to the end of the grip 3 is pressed downward. At the same time, this causes the drive shaft 5 supported via the ball bearings 17 in the bowl-shaped portion 18 to move downward. This is possible because the needle bearing 8 is movable along the opening 25 of the mechanical casing 10 on which the needle bearing 8 is supported. In addition, the cutter head 7 fixedly coupled to the drive shaft 5 is thereby pressed downward in the axial direction. As a result, the cutter 2 on the rotating cutter head 7 protrudes beyond the reference plane 14 and at the same time engages with the surface to be processed. This engagement, represented by the depth of cut A, slowly expands until the depth of cut A reaches the maximum value A1. When the head 19 of the grip 3 comes into contact with the stopper 15, the cutting depth A reaches this maximum value A1. Therefore, by providing various spacers between the stopper 15 and the head 19, the maximum value A1 of the cutting depth A can be adjusted. In another possibility, the stopper 15 is rotatable and is arranged on the machine casing 10 so that it can be rotated into and out of the machine casing 10 in the form of a screw.
[0019]
Therefore, unless the force F acts on the entry control unit 16, the surface of the mechanical casing 10 on which the reference surface 14 is mounted is not processed even in the rotating cut head 7. Furthermore, any reciprocal sliding of the power tool 1 on the surface does not cause any engagement with the surface of the cutter 2. Only when the user intentionally applies the force F to the entry control unit 16 is the engagement of the cutter 2 with the surface. Since these occur continuously, in the rotating cutter head 7, the cutter 2 moves slowly from the minimum cutting depth A0 to the maximum cutting depth A1. As a result, the cutter 2 gradually enters the surface, so that the operation of the power tool 1 is facilitated. At the same time as the operator stops applying pressure to the head 19, the cutter head 7 and the cutter 2 fixed to the cutter head 7 also move to the starting position again and reach the minimum cutting depth A0 again. As a result, the cutter 2 is no longer engaged with the surface. Thus, unintended surface damage is largely avoided.
[0020]
3 and 4 show a second embodiment of the hand-held power tool 1 according to the invention, this time in the form of an electric planer. Parts that act in the same way as in FIGS. 1 and 2 are numbered the same. The electric planer in FIG. 3 is shown in a state comparable to FIG. 1, while the electric planer in FIG. 4 is shown in a state comparable to FIG. In the electric plane, the cutter head 7 moves around a horizontal axis 20 that is fixedly supported in the machine casing 10. At that time, the cutter head 7 is rotated by known driving means not described in detail. The cutter 2 protrudes in the radial direction via the cutter head 7, and therefore the cutter 2 forms a circular orbit. The engagement surface 24 is defined by the deepest position of the circular orbit. A guide surface 22 is formed on the lower surface of the machine casing 10, and the electric tool slides on the surface to be processed on the guide surface 22. The circular orbit of the cutter 2 does not protrude from the guide surface 22 at that time. Similarly, a slide shoe 30 is disposed on the lower surface of the machine casing 10, and the slide shoe 30 is movable along an inclined surface 23 formed in the machine casing 10 and slides with respect to the machine casing 10. Is possible. Guide of the slide shoe 30 along the inclined surface 23 is performed by known guide means not shown. A stopper 15 is formed on the inclined surface 23. A spring 4 is disposed between the stopper 15 and the slide shoe 30, and the spring 4 presses the slide shoe 30 in a direction away from the stopper 15. A grip 21 is provided on the upper surface of the mechanical casing 10 opposite to the slide shoe 30. Here, the approach control unit 16 includes a slide shoe 30, a spring 4, and an inclined surface 23.
[0021]
In FIG. 3, no force acts on the slide shoe 30 along the inclined surface 23. At that time, the spring 4 presses the slide shoe 30 downward along the inclined surface 23 until the reference surface 14 formed on the lower surface of the slide shoe 30 becomes deeper than the engagement surface 24 of the cutter 2. This means that even if the electric plane moves on the surface of the workpiece to be machined along the movement direction B, the cutter 2 does not engage the surface.
[0022]
In FIG. 4, a force F applied to the grip 21 is applied to the electric plane parallel to the inclined surface 23. Furthermore, the electric plane is additionally guided in the movement direction B on the surface. The slide shoe 30 moves to the stopper 15 against the force of the spring 4 along the inclined surface 23 by the force F. At the same time as the reference surface 14 becomes higher than the engagement surface 24 of the cutter 2, the rotating cutter head 7 starts to remove material from the surface. These are performed continuously. This is because the cut depth A defined by the difference between the reference surface 14 and the engagement surface 24 continuously increases. Simultaneously with the contact of the slide shoe 30 with the stopper 15, the maximum depth of cut A1 is reached. When the electric plane is guided in the direction of movement B with a constant force F on the surface, a constant removal of material from the surface is guaranteed.
[0023]
At the same time as the operator reduces the force F to the grip 21, the slide shoe 30 receives the force of the spring 4 and moves downward. This continues until the force F is zero and therefore the operator no longer presses the power planer. At that time, the state is returned to the state shown in FIG.
[0024]
Also in this embodiment, since the engagement of the cutter 2 with the surface of the cutter 2 is performed only by deliberate pressing on the grip 21, unintended damage to the surface is avoided.
[Brief description of the drawings]
FIG. 1 is a simplified cross-sectional view of an end face cutting tool according to the present invention with an entry control portion in a stationary state.
FIG. 2 is a cross-sectional view similar to FIG. 1 with the entry control unit in the working position.
FIG. 3 is a simplified cross-sectional view of an electric planer according to the present invention with an approach control unit in a stationary state.
4 is a cross-sectional view similar to FIG. 4, with the entry control unit in the working position.
[Explanation of symbols]
1 hand-held power tool, 2 cutters, 3 grips, 4 springs, 5 drive shafts, 6 belt wheels, 7 cutter heads, 8 needle bearings, 9 vertical shafts, 10 machine casings, 11 drive motors, 12 belt drive units, 13 Protective casing, 14 reference surface, 15 stopper, 16 entry control unit, 17 ball bearing, 18 bowl-shaped unit, 19 head, 20 horizontal axis, 21 grip, 22 guide surface, 23 inclined surface, 24 engagement surface, 25 opening Part, 30 slide shoe, A depth of cut, A0 minimum depth of cut, A1 maximum depth of cut, B direction of motion, F force

Claims (13)

A hand-held power tool (1) having a base (10) having a reference surface (14) and a rotationally driven cutter head (7) having at least one cutter (2). And the engagement surface (24) of the cutter (2) defines the depth of cut (A) relative to the reference surface (14),
It has an entry control unit (16), and the entry control unit (16) causes the cutter (2) to have a reference surface (14) for processing the surface on the surface to be processed. Then, based on the force of the spring (4) of the entry control section (16), the position where the cutter (2) does not engage the surface to be machined and another force (F) that opposes the force of the spring (4). ) Is movable between another position where the cutter (2) engages the surface to be machined according to the adjusted depth of cut (A), and the depth of cut (A) Is changeable between a minimum value (A0) equal to zero and a maximum value (A1).   The power tool according to claim 1, wherein the approach control unit (16) moves the cutter head (7) rotatable about the vertical axis (9) along the vertical axis (9).   The cutter head (7) is coupled to a grip (3) protruding beyond the base (10), and the grip (3) is fixed to the cutter head (7). The power tool according to claim 2, wherein the power tool is slidable with respect to the vertical axis (9). The power tool according to claim 2 or 3, wherein the cutting depth (A) can be defined by a stopper (15) between the grip (3) and the base body ( 10 ).   The cutter head (7) rotates about a horizontal axis (20), the reference surface (14) is slidable relative to the base (10), and the base (10) is one guide surface (22). The electric tool according to claim 1, comprising:   The power tool according to claim 5, wherein the reference surface (14) is formed on the slide shoe (30), and the slide shoe (30) is movable along the inclined surface (23) of the base (10).   The power tool according to claim 5 or 6, wherein the cutting depth (A) can be defined by a stopper (15) movable and fixed in the base body (10).   The electric tool according to any one of claims 1 to 7, wherein the base body (10) comprises a protective casing (13), and the protective casing (13) is arranged surrounding the cutter head (7). .   The stopper (15) is slidably supported, and the cutter (2) is processed based on the force of the spring (4) of the entry control section (16) by sliding and fixing the stopper (15). The power tool according to claim 4, wherein the depth of cut is adjustable within a range in which the cutter (2) is movable by the entry control unit (16) starting from a position where it does not engage the power surface. The electric motor according to claim 8, wherein a spring (4) is provided so that the cutter (2) is completely held in the protective housing (13) in the axial direction when the entry control (16) is inactive. tool.   A drive shaft (5) for driving the cutter head (7) is provided, and the drive shaft (5) is supported on the bowl-shaped part (18) via a ball bearing (17). Item 11. The electric tool according to any one of Items 1 to 10.   The power tool according to claim 11, wherein the drive shaft (5) is supported on the base body (10) so as to be axially movable by a needle bearing (8).   The bowl-shaped part (18) is fixedly coupled to the end of the grip (3), and the spring (4) is provided to press the grip (3) with a force acting in a direction away from the base (10). The power tool according to claim 11 or 12, wherein the power tool is provided.

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