DE7725999U1 - DEVICE FOR CREATING A RIGHT-ANGLED JOINT OF TWO WOODEN PANELS OR BOARDS - Google Patents

Description

EIKENBERG 8c BRÜMMERSTEDT PATENT LAWYERS IN HANOVER

Alois Gr-aen 473/1

Device for creating a right-angled connection between two wooden panels or boards ·. . * ^left

The invention relates to a milling device for milling of circular segment-shaped grooves for receiving a correspondingly shaped flat dowel in the end faces of two at right angles to be connected wooden panels or boards, the milling device with a rotating, parallel to the support surface the machine arranged and against the action of a spring from a slot in a perpendicular to the support surface Front side slidable milling cutter is provided.

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When attaching a board to another at a right-angled connection, for example, when doing carpentry work for interior work, almost elliptical Some flat dowels compared to the cylindrical ones that were used in the past Dowels enforced. The flat dowels are made of pressed, provided with a surface structure to create glue spaces Wood, each with its narrow sides in a milled groove of the shape of a segment of a circle of the two together connecting wooden parts is immersed.

The improvement in working conditions compared to cylindrical wooden dowels is essentially that in the longitudinal direction the flat dowels or the milled grooves, there is little possibility of shifting the two wooden parts to be connected against each other is possible, which is completely excluded when using cylindrical wooden dowels. If there are several dowels next to each other for one and the same connection is prevented that even the slightest misalignment of the corresponding Holes the dowels are subjected to shear stress. In addition, the flat dowel is at least in the longitudinal direction after joining the two wooden parts a slight shift is possible, which is often very desirable for the last, most precise adjustment.

The ones used to create the circular segment-shaped grooves "Hand-held milling machines have a cuboid base body with a flat support surface on its underside and a slot on its one end face. In the base body there is a tool that carries the milling tool together with the drive Slide mounted so that it can be moved parallel to the support surface, a spring fixing the slide in a position of rest relative to the base body. After the main body with the slot having Front side is placed on the connection point of the wooden part to be milled - protrude as a safeguard against slipping two fixed points protrude from this face - that will

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rotating milling tool with the slide together against the! j force of the return spring in the direction of the ί moved face, with the · milling tool through the Slit emerges on the front side and penetrates into the wooden part adjacent to it (see also Fig. 2).

The preparations for -a flat dowel connection in the Fig. 1 A shown connection of two wooden boards 1 and 2 are illustrated with reference to FIG. 1B. First of all, it will be with the side Grooves 4 to be provided wooden board 1 flat on a flat Laid underground and at a distance from its upper edge that corresponds to the thickness of the horizontally arranged wooden board 2, provided with a scratch or a marking line. Then the horizontally arranged wooden board 2 with its front edge placed on the scribe or on the marking line. Before the grooves 4 are milled into the respective wooden boards 1 and 2 markings must be made on the corresponding sides to ensure the exact alignment of the groove <in 4 -in ensure their longitudinal direction. Finally, with the one shown in Fig.

2 milled the grooves 4, the grooves 4 in the vertically arranged wooden board 1 taking into account the markings 6 and under the contact surface of the milling machine arise on the front side of the wooden board 2, while the grooves 4 in the front side of the horizontally arranged wooden board 2 also taking into account the markings 6 and below. Rest of the support surface of the machine on the protruding end of the wooden board 1 arise.

It is obvious that the preparations for attaching the grooves are quite extensive and very easily flawed

f can be afflicted, which will later result in a bad fit of the

result in both wooden parts. Because every marking includes the possibility that reading errors will be made

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and that because of the material thickness of the scribing tool or the
unwanted shifting of the markings occur with the pen used. In addition, the contact surfaces are

end of the actual milling process, due to the thin J

Board thickness, much too short, so that the machine |

is tilted back and forth very easily, making a J

a groove that is too wide is created, which afterwards only results in an inadequate connection

bond causes. In addition, the milling machine can L

not at right angles to the respective end-face contact surface j

be held, so that a not exactly right-angled position of the I wood connection or a squeezing of the flat dowels in the grooves

The result is.

The existing ones based on the principle of the flat dowel, initially I

The advantages described over the cylindrical dowel are there- § .through often excited and come only with extremely conscientious | Carrying out all of the tasks necessary for carrying. It j is therefore the object of the invention to provide a device for Her- jj to create end-to-end wood connections which, in conjunction with the usual hand-held milling machines, make the previous j Preparations are limited to a minimum, compliance with the specified slot position is guaranteed and also used by the joinery.

being very easy to use for untrained people. ■: · {

The invention consists in that a table is provided for guiding the milling device, on the right-hand side of the table
Angle a plate is arranged, and that in the table top
and parallel to each other in the two plate sides
Alignment strips are embedded, which serve not only to guide the milling machine but also to position the wooden parts, with the
Alignment strips on both sides of the plate and the alignment strips
on the top of the table in the same level.

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With the help of the device according to the invention are as preparatory Work on milling out the grooves for the flat dowels no longer requires scribing or marking work, but the Wooden parts are clamped either on the table surface or vertically on one of the plate sides as the only preparatory work.

With a few exceptions, which are described below, the hand-held milling machine is always on the top of the table placed with its entire contact surface of the base body and arbitrarily with the help of the alignment strips embedded therein positioned in a reproducible manner.

The use of the device according to the invention and its further advantages are explained in more detail below using an exemplary embodiment that is shown in the drawing; it mean:

Fig. 1A is a view of a corner connection between two wooden boards

FIG. 1B shows an isometric view of two wooden boards to be connected according to FIG. 1A the usual procedure up to now

Fig. 2 is an isometric view of a handheld used in connection with the invention Milling machine

3 shows an isometric view of the device according to the invention and

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Fig. 4 is a plan view of the inventive

Contraption.

Those embedded in the tabletop sides and in the table surface Alignment strips can be replaced by simple grid lines applied to the respective surface, the same To serve a purpose. The exemplary embodiment described below has such raster lines.

1 A and B have already been explained with reference to the description of the prior art, so that here to avoid Repetitions, no further treatment is required.

In Fig. 2, the hand-held milling machine 7 used in connection with the invention is shown schematically. It consists in essentially of a base body 8, which at its one end face 10 which is at right angles to its lower support surface Has slot 12. Within the base body 8, a carriage 14 is guided, in which a surface parallel to the lower support arranged milling tool 16 including drive 18, which is also designed as a handle for touching the machine (not shown) is stored. The carriage 14 is with the help a non-visible spring held in a retracted rest position.

To mill out a groove 4 (Fig. 1 B), the milling machine is pressed with its end face 10 against that surface of a wooden part, in which a groove is to be milled. Two tips 20 protruding from the end face 10 penetrate the wood surface a and thus prevent the displacement of the base body 8 relative to the corresponding wooden surface. The actual milling process is now by pushing the carriage 14 within the Base body 8 from the rest position causes against the action of the spring in the direction of the wood surface, the milling cutter 16 emerges from the slot 12 and in the wooden surface a circular

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. segment-shaped groove for insertion of a flat plug 21 back ■ j can. . ''

In Fig. 3, the device according to the invention is in an isometric View shown. It consists essentially of a table 22, which with the help of trestles or not shown the like is kept at a normal working height. Approximately in the middle of the table 22 is a vertical to the table surface arranged plate 24 attached, which ends with its lower edge at a predetermined distance in front of the table surface, so that Wooden parts of all thicknesses between the table surface and the lower edge of the plate 24 can be pushed through. The side edges of the table 22 and the plate 24 are provided with the respective surfaces projecting profiles 26, which as Stop strips27 'are used and also the table 22 or the Wear plate 24.

In Fig. 3, the milling of grooves 4 for a corner connection according to FIG. 1 A is shown schematically, the hand-held Milling machine 7 is shown only as a cuboid for the sake of simplicity. On the right half of the picture the dashed line is in the corner connection horizontally arranged wooden board 2 can be seen in the already processed state, that is, on the front side Grooves 4 are already milled. It has not been processed in this position relative to the table 22 - during processing was the front side of the wooden board 2 approximately in the middle of the table but it is from the processing position exclusively in the longitudinal direction has been pushed onto the table 22 in the position shown.

On the side of the plate 24 facing the viewer, the wooden board 1 arranged vertically at the corner connection is with the aid attached by clamping elements not shown. It stands with its lower edge on the surface of the table 22 and

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• rests with its one side edge on the one stop bar 27

of the one profile 26. It can be seen that one groove 4 -

* has already been milled - it is assumed that a fastening with a total of two flat dowels 21 is sufficient for this connection while the other groove 4 still has to be milled.

During the milling of the first, illustrated groove 4, the cutting machine 7 with its right edge in the feed direction of the base body 8 to the stop bar 27 of the viewer facing profile 26 created. In addition, of course, the end face 10 of the base body 8 was in contact with the wooden board 1. For milling out of the second groove, the right edge of the base body 8 in the feed direction also lies on the grid line d of the evenly grid lines a - g distributed over the table surface. The sharp contour of the cuboid base body 8 in connection Positioning is possible with precise, thin grid lines of the milling machine 7 accurate to within half a millimeter Table surface. It should be noted that the height of the grooves x 4 above the table surface and thus the distance of the grooves from the Lower edge of the wooden board 1, which forms the upper edge in the assembled corner connection according to FIG. 1A, by the distance of the milling tool depends on the support surface of the base body 8.

These last-mentioned relationships are essential for the application of the in the corner joint horizontally 1 laying board 2 on the surface of the table 22 is important. Because also the one in the front The grooves 4 milled into the wooden board 2 have also been milled with the milling machine 7 lying on the table surface, so that the height of the grooves 4 above the table surface in turn depends on the distance of the milling tool 16 from the support surface of the Base body 8 depends. As can be seen from the marking V 28, the one arranged horizontally in the corner connection is located

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Wooden board 2 when milling with its top on the table surface, so that the distance between the grooves 4 in the two Wooden boards 1 and 2, measured from the respectively flush top edge, is the same size, namely the distance of the Milling tool 16 corresponds to the support surface of the base body 8. The lateral correspondence of the grooves 4 on the two wooden boards 1 and 2 is ensured by the fact that the milling machine 7 was guided in the milling of the grooves 4 in the wooden board 2 that the right edge of the base body 8 once the grid line g (identical to the stop bar 27 of the profile 26) and on the other hand on the grid line d.

This results in an extremely neat corner connection which, with the appropriate precision of the milling machine 7, is as good as can never have a step or a jump. Despite the high quality of this connection, there is not a single crack or none Only marking line was required, and at no time was the thickness of the wooden boards 1 and 2 measured and utilized in the course of processing. Even if the thickness of the horizontally arranged wooden board, for example 2 fluctuates as a result of manufacturing tolerances, a smooth transition between the two wooden parts that are joined is always guaranteed, if the principle is observed that always the good side, i.e. the one for the step-free formation of the connection the relevant side of each wooden part comes to rest on the table surface during the milling process.

If a particularly resilient connection has been created is to be, in addition to the two grooves 4 provided here, for example, further grooves can be milled in between, wherein the grid lines e and f can be used, and the milling machine 7 viewed in the conveying direction both with its right as well as rest with their left edge of the base body 8 on the respective grid line during the individual milling processes

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ι In Fig. 4 is a further development of the invention in connection . shown with a special purpose. On the table 22 of the device shown in plan view is a wooden

board 30, which acts as a boundary board of a so-called grid ceiling can serve, in the finished state then protrude from the wooden board from vertically up further boards in connection with Further wooden boards arranged parallel to the wooden board 30 shown are the later compartments within such a grid ceiling form. When processing the wooden board 30, it is important that further boards are vertically, vertically spaced at regular intervals can be attached to it, so flat dowels can be used in grooves 4.

For this purpose, the grooves of a row I required at one end of the wooden board 30 are first milled in the same way as the grooves in the wooden board 1 according to FIG. 3. Then the wooden board 30 pivoted out of the vertical position into the horizontal position and placed on the table 22, with the contact side at the stop bar 27 is retained. In order to maintain the same distance between the grooves 4 of the row I and those of the neighboring ones Rows II, III, etc., a stop 32 is used, which is steplessly along the one profile 26 on the longitudinal edge of the table is adjustable.

As can be seen from the enlarged illustration in FIG. 4, it is provided with a pivot arm 34 at its front end a stop body 3 T formed in the width of the grooves 4 in the form of a pin or, as shown here, in the form of a segment of a circle is arranged. As soon as the wooden board 30 rests against the stop bar 27, that is to say against the grid line a and the Swivel arm 34 with its stop body 31 dips into a groove 4, the position of the wooden board 30 on the table 22 is clearly defined.

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So after the grooves 4 of row I have been milled, the stop 32 is attached at a predetermined distance from the board 24, so that when the base body contact surface of the milling machine 7 is in contact with one of the two sides of the board (in the illustration in Fig. 4 on the left side of the board) and the following in vertical Direction executed Eräsvorgang the so resulting Grooves 4 of row II from row I have the specified ceiling grid spacing. The lateral orientation of the in the three milling layers, shown in dashed lines, milling machine 7 on the plate 24 is done with the aid of the grid line a - g on the Plate, wherein in the example shown, the right edge of the base body 8 of the milling machine 7 on the grid line a and d and the »left edge lies against grid line c.

After completion of the row of grooves II, the swivel arm 34 of the stop 32 is swiveled up, the clamping elements for fixing of the wooden board 30 released on the table 22, and the wooden board 30 advanced so far that the stop body 31 of the pivot arm 34 dips into the outermost groove of row II, as shown in FIG. 4. In this position the row of grooves III can be milled, whereupon the entire process already described is repeated.

In this way, a grid ceiling can be prepared for fastening with the help of flat dowels in an extremely short time, because again no tears or markings are required. The quality of the connections is extremely satisfactory despite the high working speed, as the milling machine 7 always with its contact surface on a sufficiently large one Surface, namely the plate 24, rests. Of course, the stop 32 can also be used in other ways, e.g. in making a series of the same T-shaped wooden connections to position the 'N & cen on the board above

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it is sufficient to place the board in contact with the stop at the front
to bring the grooves required in the middle of the board for each
To place part of the series consistently precisely. There is no need
then the formation of the stop to a stop body
31, which can dip into the grooves 4, although of course one
such training is not harmful.

In any case, it is advantageous to use the grid lines a - g
highlighted in color, whereby it is particularly expedient to design mirror-symmetrically identical grid lines, that is, for example, grid lines b and f or c and e in the same color, which facilitates orientation on table 22 even more
will.

-Claims for protection- |

Claims (6)

• ■ * »ft Protection claims: 1. Milling device for milling in circular segment-shaped grooves for receiving a correspondingly shaped flat dowel in the end faces? One at right angles. wooden panels or boards to be connected, the milling device being provided with a rotating milling cutter which is arranged parallel to its support surface and can be displaced against the action of a spring from a slot in an end face adjoining the support surface at a right angle, characterized in that for guiding the milling device ( 7) a table (22) is provided, to the surface of which a plate (24) is arranged at right angles, and that in the table top and in the two plate sides parallel alignment strips (a to g) are embedded, which apart from the guide the milling device also serve to position the wooden parts, with the alignment strips on the two sides of the plate and the alignment strips on the top of the table each in the same planes. 2. Apparatus according to claim 1, characterized in that the plate (24) is arranged with its lower edge at a distance from the table surface. 3. Apparatus according to claim 1 or 2, characterized in that two parallel to the straightening strips (a to g) extending Arischlagträger (27) are provided as the side table delimitation and plate delimitation. 7725999 01/05/78 4. Apparatus according to claim 3, characterized in that a releasably attached stop (32) is provided at least on one stop bar (27) of the table (22). 5. Apparatus according to claim 4, characterized in that the stop (32) is provided with a Schwenxarm (34) to which a stop body (31) is attached, ^ the width of which corresponds to the width of a milled groove (4) 6. Device according to one of the preceding claims, characterized in that brackets for öchnellspannelemente are attached over the table top and on the two plate sides. Wr / dm / 725999 O5.01.78