DE19807282B4 - Electric tool with a bearing surface arranged on a housing - Google Patents

Abstract

Power tool in particular electrically operated hand drill (1) or the like, at on a housing (7) a bearing surface (2) is arranged, which at an adjustable angle to the working direction of the tool (4) is alignable, so that the angle between the tool (4) and the support surface (2) during actuation of the Tool (4) does not change, the bearing surface (2) displaceable along the working direction and on the housing (7) is hinged, characterized in that the housing (7) at least one Scherenparallelogramm (12) bears, which on the one hand on the housing (7) is articulated and on the opposite corner on the other hand the bearing surface (2) is articulated, whereby the support surface (2) to the housing (7) is displaceable in parallel.

Description

The The invention relates to a power tool, in particular an electric operated hand drill, with a arranged on a housing Supporting surface.

State of the art

Known Power tools, in particular electrically operated, free-running power tools, For example, you can drill holes in different materials used. It is the skill of the user to decide whether the set holes are guided perpendicularly or at right angles. The use of drill stands for the precise Drilling is known, but not for drilling, for example Dowel holes in Walls and Ceilings suitable. For this purpose will be attachments provided, which cumbersome to handle and often likewise not too precise Result in work results.

From "Tools for highest demands ", catalog of the company FESTO, 1996/1997, page 88, shows a carpentry circular saw, which has a rip fence, the as a leadership when sawing, milling or Planing can be used.

In Framework of the invention are under power tools in particular Drills, impact drills, hammer drill and the like understood. The electric drive can both over a connection to a supply network as well as via rechargeable Accumulators be supplied with a voltage.

Advantages of the invention

The Power tool according to the invention, in particular electrically operated hand drill and the like, offers the Advantage that in easy way of a safe and precise guidance, which is the desired or elected Working direction of the power tool receives is possible. The fact that the housing a level bearing surface arranged which is at a fixed, adjustable angle to the working direction of the power tool is alignable, the tool by the bearing surface passed through or past it, being the angle between tool and bearing surface while the operation the tool does not change, ensures a secure support of the power tool during the entire work process, whereby in particular a precise bore or the like can be carried out in a simple manner.

The bearing surface is displaceable along the working direction and hinged to the housing and guided.

For this is the case associated with at least one shear parallelogram according to the toggle lever principle, which on the one hand on the housing is articulated and hinged to the opposite corner of the support surface is. This is the workspace to the housing parallel sliding, so that a exact guidance of the power tool is possible.

Prefers is it that the the tool-carrying head or the tool itself, if necessary along with the tool holding and driving means, along the working direction is displaceable.

A Another preferred embodiment of Invention is characterized in that the tool carrying the Head is rotatable transversely to the working direction. Preference is here, that the Angle between bearing surface and tool is adjustable by the head carrying the tool or on the case hinged support surface are designed pivotally. This also makes it possible to drill holes exactly perform, which do not run perpendicular to the workpiece.

advantageously, the support surface has stop aids, Alignment aids, fixing means, centering devices and / or guides on, which are fixed next to, on and / or on the support surface or set can be. It is particularly preferred if the support surface carries, for example, Velcro fasteners on which Documents can be attached which are hard, soft, smooth and / or slip resistant. Suitable materials are known to the person skilled in the art.

hereby the power tool is fixed on the workpiece. By means of guide pins can be precise, for example Create Bohrmuster, so that at the use of suitable stencils on stationary drills or horizontal stand omitted can be without the precision the drilling suffers. This is especially true for large and already partially assembled workpieces advantageous. Also at Repair work on workpieces, in which a disassembly into smaller units, which, for example on a horizontal stand could be edited, not possible is, the workpieces can be with the power tool according to the invention precise to edit.

Further advantageous embodiments of the invention will become apparent from the others, in the subclaims mentioned features.

drawings

The Invention will be described below in embodiments with reference to FIG associated Drawings closer explained. Show it:

1 a schematic partial longitudinal section of a hand drill;

2 a schematic partial longitudinal section of a hand drill according to the invention;

Description of the embodiments

Of the Structure and function of hand drills or the like are well known.

1 shows in a partial longitudinal section of a hand drill 1 , A base plate of a housing 7 is designed as a flat surface and provides a bearing surface 2 dar. A drive motor is transverse in the housing 7 arranged and drives in a known manner a drill 4 or possibly another tool.

A head 3 the hand drill 1 is designed such that the drill 4 can be moved along its working direction during the drilling process while still driving the drill 4 is ensured. A drill spindle 9 thus moves transversely to the fixed drive motor. The other end of the drill spindle 9 has a pressure plate 6 on, over which a mechanical pressure on the drilling spindle 9 can be exercised during the work process. Here is the force of a return spring 8th to overcome. To protect the drill spindle 9 from pollution, especially dust, is between the head 3 and the printing plate 6 a cuff 5 intended.

The head 3 is rotatably arranged to the drive motor - in the direction of rotation of a drive shaft of the drive motor. The entire head 3 can thus be rotated at a predetermined angle. By appropriately provided, not shown detents between the housing 7 and the housing of the head 3 on the opposite surfaces, a precise adjustment of the desired drilling angle is possible.

For fixing the support surface 2 on the respective workpiece can in the area of the bearing surface 2 or on the support surface 2 Fixing, stop aids, alignment aids and / or guides may be provided. The bearing surface 2 For example, it can be provided with a Velcro closure, on which then various documents are fixed, which can be smooth, soft, hard and / or slip resistant. Depending on the field of application, suitable documents are known to the person skilled in the art.

It is also possible on the support surface 2 Set wedges so that holes can be made precisely and reproducibly at any angle with respect to the workpiece. Such wedges can be attached, for example by means of Velcro straps on the support surface. In addition, in the bearing surface 2 a so-called track-ball can be integrated, which is a simple alignment of the hand drill 1 allowed.

An intended depth stop 11 acts on reaching the set drilling depth against the pressure plate 6 and thus limits the spindle stroke. At the bottom of the head 3 may be another, here merely indicated dust sleeve 10 be provided, which the drill 4 encloses and serves for the extraction of dust and chips. The hand drill 1 can this one, not shown in detail, have integrated dust extraction.

The hand drill is used for drilling 1 with the support surface 2 placed on the workpiece or when drilling dowel holes on the wall. After checking the position of the drill 4 is by depressing the pressure plate 6 the drill spindle 9 with the drill 4 moved towards the workpiece. By fixing the hand drill 1 on the workpiece, a precise bore is achieved in the angle that has been previously set, with an axial and / or radial adjustment of the drilling angle is possible.

2 shows in a partial longitudinal section of a drill 1 in an embodiment according to the invention, wherein the same parts as in 1 provided with the same reference numerals and are not explained again. The bearing surface 2 is on the case 7 hinged. For this purpose, a shear parallelogram 12 intended. This arrangement ensures that the bearing surface 2 parallel to the housing 7 is movable, so that the angle and the relative direction of movement of the drill 4 with respect to the support surface 2 does not change. Instead of the illustrated toggle principle for parallel guidance of surfaces to each other, other, known in the art guides can be used, such as a scissors grille, a column guide or a drawer slide. Advantageously, the guide means are by dust cuffs 5 protected.

It is further provided, the angle between the housing 7 and the bearing surface 2 to make arbitrarily adjustable. For this purpose, by means of known devices, such as a spindle drive, the angle between the housing 7 and the bearing surface 2 set in such a way that the surfaces are no longer parallel to each other. This makes it possible to set holes at a predetermined angle precisely and reproducibly.

Furthermore, a depth stop 11 be provided, which is set for example by means of a spindle. Such devices are known in the art. This depth stop 11 then sets on reaching the preset drilling depth on top of the support surface 2 and thus stops the drive into the workpiece.

Alternatively or simultaneously, can be provided, the head 3 rotatable to make the drive axis of the transverse drive motor. This also makes it possible to set holes with predetermined angles to the workpiece surface.

The design of the support surface 2 can be analogous to the hand drill 1 according to 1 that is, additional funds to improve the liability, leadership or Winkelanstellung identify.

For drilling, the support surface 2 placed on the workpiece and optionally set the depth setting. When you turn on the drill drive then the entire hand drill 1 slowly depressed in the direction of the workpiece. This lowers the drill 4 and executes the intended hole. The drilling is carried out precisely and reproducibly at the pre-set angle with the depth also set.

Claims (6)

Electric tool, in particular electrically operated hand drill ( 1 ) or the like, in which on a housing ( 7 ) a support surface ( 2 ) arranged at an adjustable angle to the working direction of the tool ( 4 ) is alignable, so that the angle between the tool ( 4 ) and the bearing surface ( 2 ) during operation of the tool ( 4 ), the bearing surface ( 2 ) displaceable along the working direction and on the housing ( 7 ) is hinged by the fact that the housing ( 7 ) at least one shear parallelogram ( 12 ), which on the one hand on the housing ( 7 ) is articulated and on its opposite corner on the other hand, the support surface ( 2 ), whereby the contact surface ( 2 ) to the housing ( 7 ) is displaceable in parallel. Power tool according to claim 1, characterized in that a tool ( 4 ) wearing head ( 3 ) or the tool ( 4 ) itself, if necessary together with the tool ( 4 ) holding and driving means, along the working direction is displaceable. Power tool according to claim 1 or 2, characterized in that the tool ( 4 ) wearing head ( 3 ) is rotatable transversely to the working direction. Power tool according to one of claims 1 to 3, characterized in that the angle between support surface ( 2 ) and tools ( 4 ) is adjustable by the tool ( 4 ) wearing head ( 3 ) or on the housing ( 7 ) hinged support surface ( 2 ) are designed pivotally. Power tool according to one of claims 1 to 4, characterized in that the bearing surface ( 2 ) Stop aids, alignment aids, fixing means, centering devices and / or guides, which beside, on and / or on the support surface ( 2 ) or can be specified. Power tool according to one of claims 1 to 5, characterized in that the bearing surface ( 2 ) Velcro fasteners on which documents can be attached, which are hard, soft, smooth and / or slip resistant.