Tooth connection

FIELD: machine building.

SUBSTANCE: tooth connection contains at least one pin. Additionally required forms of pins are processed with a mill by means of a cutting tool, such as a milling cursor for both connected parts. Height of at least one additional pair of pins varies along length of blocking pair of pins.

EFFECT: increased strength of connection.

8 cl, 14 dwg

 

The present invention relates to a toothed coupling according to the preamble of claim 1 and the method according to the preamble of claim 7.

Gear connections in the joints of the wooden beams is well known. However, some problems associated with such gear connections.

One problem is that the fingers remain visible on all sides, but usually they are visible, at least on two sides. Visible fingers cause many different problems. They violate the aesthetic appearance. Usually, they cannot be painted without rough machining, such as grinding and priming. Because of visible finger water and dirt can penetrate into the wood and cause damage.

Another disadvantage associated with the timing connections, is that the finger grip reach the outer side of the connection. This gear connection is described, for example, in the publication US 3452502. From the coupling parts of the material removed on the outer side of the connecting section, which reduces the strength. The fingers on the outer side of the connection look bad, and, in addition, water and dirt can collect in them, causing their damage. In addition, this problem is related to timing connections, when during Assembly of the connection difficult to place. Finger grip do not place the fitting technoatomenergo each other.

Existing gear connections are not optimally robust, because they have structural breaks, which cause large local strain.

The present invention is the creation of such a gear connection, which eliminates these problems. A new connection is improved compared with the previous connection, which is confirmed by more clearly in the variants of its implementation, it is visually corresponds to a qualitatively higher level and is more durable, especially the gear connection, the fingers of which are invisible, and from the coupling parts is not removed material on the outer side of the connecting section. Connection in accordance with the present invention is characterized by what is defined in the preamble of claim 1 and the method is characterized in that they are defined in the preamble of claim 7.

The present invention uses some of the known methods.

Connection is made by cutting more fingers between the parts, usually, mostly, fingers, tapering towards the end.

- Glue is applied to the fingers, and they are compressed together. In special cases, the connection is also used nails, screws and other connecting means intended for hardening compounds or ease of manufacture. In d the natives particular case, when the strength of the connection is a secondary, or when the connection is made in circumstances in which the use of glue is not possible, as, for example, outside the factory conditions, when there is no adhesive or other connecting means, so that the connection is only through contact connecting surfaces.

Fingers in the parts to be joined may be similar, as both parts to be joined, can be processed using the same cutter, only changing the position of the cutter relative to the connecting parts. However, usually the fingers in the connecting parts may be different, resulting in the need to have two different cutter is covered by the cutter and covering the cutter.

The present invention uses some of the new solutions.

- The height of the finger is changed. The fingers have the smallest height at the ends of the connection or, at least, at the other end. Change the height of the fingers is such that the cutter is moved farther from the connecting part, which is necessary to make the cut. Usually, this means that in addition to the cutting direction of the cutter is directed in the transverse direction. Alternatively, the connecting portion relative to the cutter to move into place, or they both can move the change. Usually, the connection many fingers are there, and often the height of these parallel fingers is changed equally in the cutting direction, but it is also possible that the height of the parallel fingers were changed otherwise. Usually, it is preferable that the fingers on the edges connecting section were short, for example, the fingers were short at the beginning and end of the cut, and so far fingers were short.

Usually, the height of the fingers at the ends of the cut is equal to zero. On the basis of such decisions, provided many advantages: the fingers are invisible, and the connection visually corresponds to a high quality. In accordance with these decisions, the finger grip partially outside of the connecting section, resulting in these recesses are slots for dirt and water. A new connection is robust, because the wood is not cut on the outside of the connecting section. Also achieved great strength, because the height of the fingers gradually, so that at the end of the connection do not experience a lot of stress peaks.

During cutting, the cutter is directed along the line of cut, at least at the ends of the neckline, in addition, often in the middle.

The cutter has a small diameter. The smaller the cutter, the more universal connections can be made. In some cases, n is the sample, when one connecting part is thicker than the other, mainly, to perform cutting one piece using a small cutter, and the other part by using a larger cutter. The small cutter is usually chosen as small as possible.

Usually, the surface of the joint is subjected to roughing before clipping finger in a curved form, which corresponds to the ends that need to be cut. This can be done so that the fingers are cut out when the cursor is moved in the direction to separate the cylindrical cutter or the same pointer finger through the axis.

- When high strength of the connection fingers strongly narrowed towards the end. In this connection the cutter on the cutting ends is directed perpendicular to the cutting direction, i.e. in the direction of the cutting tool. Alternatively, the part that needs to be cut, moved, and the cutter remains stationary, or both are moved. In addition, the cutting tool can also be moved. This method is especially practical if you at one time is cut only one finger. The shape of the finger on the end of the connection is different from the shape of the fingers in the middle, they are short, the lower part of the fingers is wider, and the ends already, for example, by using a single cutter cutting tool, you can get a lot of the finger according to CNAME forms, ie, the cutter of the cutting tool to cut the recess for fingers or wide as the cutter, or wider, with the possibility of change, and a finger formed in this way is shorter.

- Connecting joints in accordance with the connection of the present invention vary more than the usual connections among other things, due to inaccurate cutting. Therefore, it is advisable to use adhesive connection. It is used in fairly large coupling gaps, even in large connecting the gaps with a size of 0.6 mm

The invention is illustrated in the drawings, where

in figure 1, 2, 3, 4 shows the connection of two wooden parts, section a-a, b-b, c-c;

in figure 2, 5, 6, and 7 depict various types of fingers;

on Fig shows the connection with a curved cut out notch;

figure 9, 10 shows a corner connection;

on 11, 12 shows a corner connection parts having a thickness;

on Fig, 14 depicts the connection of the wooden pieces and Board.

1 shows a gear connection between two wooden parts 1 and 2, figure 2 and 3 shows cross-section a-a and b-b, and figure 4 shows an alternative cross section c-c. In this case, the connection is made so that the line 3 seam visible on the outer surface is straight, but in some cases, mainly suture line is curved. Obedinenie performed, mostly, in such a way that part 1 is cut along the line 3, preferably using a conventional saw. The end of the line part 2 is formed in accordance with the line 4, for example, using a cylindrical cursor or usually, mainly, by using the cursor to the finger by moving it in the direction of the axis. The connection in the middle is the usual toothed connection, as shown in figure 2, where the finger tapers towards the end. In the case of figure 3, the fingers on the ends of the cut portion 2 becomes shorter, which is achieved by moving the cutter in the direction of the axis. During processing part 2, the cutting tool does not move in the axis direction. This solution is practical in many ways. Processing of the fingers is simple. The durability is high, whereas that of the wider fingers mounted on the critical side. In some cases, the cutter can't quite move in the direction of the axis. Alternatively, the fingers of parts 1 and 2, as shown in figure 4, thus, the cut wider. Such a solution is optimal during Assembly of the connection fingers hard damaged, and parts are easily and accurately placed relative to each other. If someone will need to get the edges cut high-quality in the direction of rotation of the cutting tool, the cutting into the pot the Ah cut is set in the direction of the cutting tool, i.e. the so-called reverse flow, i.e. the direction of rotation of the cutting tool is different at different ends of the cutout recess.

Figure 5 shows a conventional tapering extra pair of fingers between the coupling parts 1 and 2, which are formed from the covered finger part 1 and covers the finger part 2. This finger optimally fits to the points that require high strength. In the compounds of glued wood height h of the finger usually is h≈3-50 mm, the end of the finger t≈0.5-2 mm, the groove g to glue depending on glue is usually equal to ≈0.1 to 1 mm, the lower part of the finger is usually chosen so that h/p≈3-6. The number of fingers is usually set as large as possible, i.e. the distribution of the fingers is p+t. Typically deleted region different from the others, because through these fingers, the edge connection is formed aesthetic high quality using known methods.

Figure 6 shows a straight or slightly tapered finger towards the end. The surface of the parts 1 and 2 are adjusted thanks to its forms so that during Assembly there is ample clearance in the gear connection, and the wooden parts are not compressed, or only slightly, so slightly that the Assembly is quite tight connection through a small SG is occupying an effort without damaging the fittings. By making this connection fingers of different sizes can be performed without movement of the cursor.

Figure 7 shows a connection in which the finger part 1 is straightforward, and the finger part 2 slightly tapering towards the end. Such fingers are suitable for connection of laminated wood, when in the lower parts of the fingers is set a small gap d, which is typically less than 0.6 mm and, in addition, is less than the largest gap for the glue provided for the use of glue. Connections are blocked in the Assembly, when the profiles of the fingers correspond to these profiles that the fingers are compressed at the ends or compressed to some small degree e.

On Fig shows a connection in which the line of cut is U-shaped curve. Using this solution, the surface of the joint is increased and at the same time also increases the strength as compared with the case where the surface of the cut is straight. In addition, achieved a large surface for the glue and less waste of material, if the neckline is shaped like the letter S, or cut passes at an angle relative to the connecting parts. This type of connection is used without glue and even without any other connection means, if the connection is only subjected to compressive stress. If the connection is subjected to a relative who entrusted a small tensile stress, the connecting means in the connection can only be nails or screws 5.

Figure 9 shows a corner connection, in which the fingers are shortened only in Bogota coal. This solution is particularly advantageous if the connection is deformed under the action of time, which causes compression in Bogota coal. Line cut is a curve, thus, the coupling length becomes larger, if the neck was straight. Line neckline can also take the form of a letter S or toothed shape. Using a cut shape you can adjust the strength of the connection or other specifications on request. Cut in accordance with the figure is the predominant, if part 1 is stronger or transverse incision more.

Figure 10 shows a corner connection between two wooden beams 1 and 2. It is necessary that the line of cut is not passed in the direction of either one of the beams, and deviated from the directions of the beams as far as possible, ie, the line neckline, mainly takes place approximately in the direction of the half-angle connection. The optimal result is achieved when the cut is made as small as possible in the direction of the beams, or as close as possible to half of the angle connection. If the adhesive connection is not used, and used, for example, screws, nails, etc., connecting the site you made the beat as much as possible, thanks mainly to make the cut so that the cut out notches were a direct continuation of the boundary line of another part.

On 11, 12 shows a corner connection of two parts of different thickness. The finger is tapered. The cutter may not move in the direction in the cutting fingers part 1, therefore, the fingers should be formed only straight in the cutting part 2. This example illustrates that the connection does not have to reach the full area of the fitting. Among other things, this solution is practical when you want the connection angle was high class, so he had no cracks, bias cut, etc. due to sharp. Accordingly, the connection can be more connected beams.

On Fig, 14 depicts the connection Board 2 and the wooden parts 1. The Board is thin, so the finger can not be continuous, as it would weaken too much the Board. When the finger is discontinuous, as shown in the figures, about half of the boards may not have the finger grip. In this case, part 1 can be made of wood, but usually, mainly in the form of farm toothed saw or cut LVL, plywood and so on, the Shape of the finger shown in Fig.7, is particularly effective when the finger part 1 is straightforward, especially predominantly, designed so that this part does not have individual finger, but the edge part 1 processed by a milling cutter or cut in the form of a finger covering part 2. Alternatively, part 1 finger tapers towards the end of the finger which is to simplify the manufacture of processed outside of the connecting section, resulting in no need to move the cutter in the direction of the axis.

The above describes some options for implementation. The idea of the present invention may also be applied in other aspects within the claims.

1. Gear connection, United, collected at least mainly of wooden parts (1, 2), such as wooden beams, laminated wooden beams, laminated plywood, particleboard, fibreboard, laminated timber, laminate, which contains at least one finger, both of these parts using a cutting tool, such as a cursor, cut the necessary additional form of finger, characterized in that the shape of the finger on the end of the connection is different from the shape of the fingers in the middle so that at least at one end of the connection height of the additional finger is smaller and the lower part of the finger is wider than in the middle.

2. The compound according to claim 1, characterized in that the height of the fingers on the ends of the connection is equal to zero so the finger in the corner of the connection is invisible.

3. The compound according to claim 1, characterized in that changing the width (t) of the end of the finger carried by the cutter in the direction of its axis.

4. The compound according to claim 3, characterized in that the angle of connection shortening of the fingers and thickening of the ends adapted for placement in another fitting, or shortening and extension of fingers adapted for placement in both connecting parts of approximately the same way.

5. The compound according to claim 4, characterized in that the difference between the bottom and the ends (p-t) is negligible, so that the pair of fingers has a small gap in the connection remains the biggest gap of about 0.6 mm

6. The compound according to any one of claims 1 to 4, characterized in that at least one of the connecting parts cut by the cutting tool, the diameter of which is small, less than 50 mm plus the height of the fingers, mostly less than 25 mm plus the height of the fingers.

7. A method of manufacturing additional gear pair of wooden parts (1, 2) by means of the cutting tool with rotation around its axis, as, for example, cursor, characterized in that the change in the height of finger exercise by direction of the cutting tool in the direction of the cut, as well as against this direction, i.e. perpendicular to the direction of its axis.

8. JV the property according to claim 7, characterized in that the cutting tool is directed to shortening and/or extension of an additional pair of fingers on the ends of the connection.



 

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