EP1068937B1 - Cutter blade for severing adhesive beads on window panes - Google Patents

Description

The invention relates to a cutting knife for a cutting tool for cutting adhesive beads on window panes from Vehicles with a U-shaped angled cross section a first leg designed as a fastening part with a fastening opening for fastening to an oscillation drive, and a second leg, which acts as a cutting part is formed and via an intermediate web with the fastening part is connected, the fastening part being flat is and from the mounting opening to Cutting part tapered.

Such U-shaped angled cutting knives are, for example known from DE 86 17 670 U1 or EP 0 141 035 B1.

Such cutting knives are known to be used in particular for cutting out of windshields used on motor vehicles, provided that one due to damage or leakage must be expanded.

If it is only a disk that has become leaky, so it must be ensured during the expansion that this due to the high frequency oscillating cutting knife is damaged. Likewise, when cutting the adhesive bead Please note that in particular the paint on the body flange, in which the disc is installed, when removing is not damaged, as this would lead to a later risk of rust could lead.

After all, the special geometry of the pane is what is involved in the removal to be observed, which depends on the respective installation conditions at a certain car type.

It has been shown that in the known cutting knives type described above still a considerable skill of the worker who cuts the adhesive bead is necessary. This requires considerable effort. Also there is still a significant risk of breakage when working with such an oscillating cutting knife.

The invention is therefore based on the object of an improved Cutting knife to create the optimized results when Removal of windows from motor vehicles allows.

This task is performed with a cutting knife according to the above mentioned type according to the invention solved in that the fastening part has an offset.

The position becomes by such an offset or angling the cutting edge in relation to the adhesive bead to be cut optimized when removing a windshield. As a result, lets the adhesive bead with considerably less effort cut. The cutting edge is also immersed in the adhesive bead avoided.

In a preferred development of the invention, the bend is formed at the end of the fastening part facing the intermediate web.

According to a further development of this embodiment, the bend is on a side facing away from the cutting part by a reference on the mounting opening convexly curved section Formed side edge of the fastening part.

According to a further embodiment of the invention, the bend is on a side facing the cutting part by a in with respect to the fastening opening concavely curved section a side edge of the fastening part is formed.

Through these measures, the geometry of the cutting part in with regard to the fastening part further improved and a cheap Guiding the cutting knife when pulling the preferably Crescent-shaped cutting part made possible by the adhesive bead. Furthermore, an improved utilization of the stroke of the Oscillation drive for actually cutting through the adhesive bead allows.

According to a further embodiment of the invention, the Cutting part at least on its attachment opening Side up with a serrated or saw cut.

This measure makes it easier to cut through the adhesive bead, especially if it's a very tough material, such as polyurethane.

According to a further embodiment of the invention, the Cutting part on its side facing away from the fastening opening a cutting edge on its cutting edge with a point angle of at least 30 °.

Through the formation of a cutting edge also at that of the fastening opening opposite side of the cutting part will lead back relieved by the already cut adhesive bead, if this is necessary depending on the course of work. Thereby, that the cutting edge facing away from the fastening opening However, the side has a large tip angle, this So the cutting edge is relatively "blunt", the cross section the cutting part thereby weakened only a little, what overall contributes to the stability of the cutting part and thus the risk of breakage is reduced.

According to an alternative embodiment of the invention, the Cutting part on its side facing away from the fastening opening just a blunt edge.

This has the advantage that the cross-sectional area of the cutting part is further enlarged and thus the susceptibility to breakage is additionally reduced.

According to a further embodiment of the invention, the object in a cutting knife according to the type mentioned solved that the cutting part has a cross section with a Has a central section with mutually parallel outer surfaces, at least on the of the mounting opening facing side an acute-angled cutting edge followed.

This also ensures an optimized workflow. In particular, there is a significantly reduced risk of breakage due to the enlarged cross section of the cutting part. Likewise, the cutting knife is immersed in the adhesive bead counteracted.

According to a further variant of the invention, the object solved the invention in that according to a cutting knife of the type mentioned at the cutting edge a section with parallel outer surfaces connected by one towards the other end slightly convex or tapered section followed.

In this way too, significantly improved cutting results can be achieved achieve. The risk of breakage is also reduced.

In these versions, too, the cutting part can at least its side facing the mounting opening one with a Have corrugated or saw cut cutting edge.

It goes without saying that these remarks also apply additionally with a bent version of the fastening part can be combined and that a serrated edge too can be provided on both sides of the cutting part.

It is further understood that the above and the Features to be explained below not only in each case specified combination, but also alone or can be used in other combinations without the frame to leave the invention.

Fig. 1

eine geschnittene Darstellung eines erfindungsgemäßen Schneidmessers im Einsatz mit einem Oszillationsantrieb,

Fig. 2

eine Seitenansicht einer ersten Ausführung eines erfindungsgemäßen Schneidmessers in einer gegenüber Fig. 1 etwas vergrößerten Darstellung;

Fig. 3

eine Ansicht des Schneidmessers gemäß Fig. 2 von vorn;

Fig. 4

eine sogenannte Abwicklung des Schneidmessers gemäß Fig. 2, d.h. einen ebenen Rohling, aus dem das Schneidmesser durch Biegen herstellbar ist;

Fig. 5

eine Seitenansicht eines leicht gegenüber der Ausführung gemäß Fig. 2 abgewandelten Schneidmessers;

Fig. 6

eine Ansicht des Schneidmessers gemäß Fig. 5 von vorn;

Fig. 7

einen Querschnitt durch das Schneidteil gemäß Fig. 5 in stark vergrößerter Darstellung;

Fig. 8

eine abgewandelte Querschnittsform des Schneidteils gemäß Fig. 7;

Fig. 9

eine weitere abgewandelte Querschnittsform des Schneidteils gemäß Fig. 7, die aus dem Stand der Technik bekannt ist und

Fig. 10

eine weitere Abwandlung der Querschnittsform des Schneidteils, die gleichfalls aus dem Stand der Technik bekannt ist.

Further features and advantages of the invention result from the following description of preferred exemplary embodiments with reference to the drawing. Show it:

Fig. 1

2 shows a sectional illustration of a cutting knife according to the invention in use with an oscillation drive,

Fig. 2

a side view of a first embodiment of a cutting knife according to the invention in a somewhat enlarged representation compared to FIG. 1;

Fig. 3

a view of the cutting knife of FIG 2 from the front.

Fig. 4

a so-called settlement of the cutting knife according to FIG 2, ie a flat blank from which the cutting knife can be produced by bending.

Fig. 5

a side view of a slightly modified cutting knife compared to the embodiment of FIG. 2;

Fig. 6

a view of the cutting knife of FIG 5 from the front.

Fig. 7

a cross section through the cutting part of FIG 5 in a greatly enlarged view.

Fig. 8

a modified cross-sectional shape of the cutting part according to FIG. 7;

Fig. 9

another modified cross-sectional shape of the cutting part according to FIG. 7, which is known from the prior art and

Fig. 10

a further modification of the cross-sectional shape of the cutting part, which is also known from the prior art.

1 shows a cutting tool according to the invention as a whole designated with the number 10.

The cutting tool 10 comprises an oscillation drive 12, whose drive shaft 14 with a high frequency in the range between around 5,000 and 28,000 vibrations per minute with a small swivel angle oscillating between about 0.5 ° and 5 ° is drivable. On the drive shaft 14 is a total the number 16 designated cutting knife with a mounting opening 18 on a polygon 20 of the drive shaft 14 positively received and by a screw 22 with a flat head 24 on a thread of the drive shaft, not shown 14 of the cutting tool 10 attached.

The cutting knife is angled approximately U-shaped in cross section and has a first, designed as a fastening part 32 Leg in which the mounting opening 18 in the form of a Twelve edges is formed, as can be seen from Fig. 2. The Fastening part 32 is connected to an intermediate web 36 second, outer leg connected as the cutting part 34 is trained.

The cutting tool 10 is used to cut through an adhesive bead 30 of a window pane 26 on a motor vehicle a body flange 28 is glued. It can be this e.g. to act as a windshield by means of a rotating Adhesive bead 30 completely sealing onto the A-pillar the body is glued on. This adhesive bead 30 consists of usually made of a special polyurethane, the one possible high UV resistance and high mechanical and long-term resistance having. By gluing the windshield with the A-pillar, the windshield is essential to the stability of the body. It is therefore understood that the adhesive bead is made of a very tough and stable material, its complete severing to remove the windshield for example after a rockfall damage noticeable effort, even if the advantageous effect of the oscillation drive 12 is taken into account becomes. For this reason, numerous cutting knife variants have already been made developed that are known in the art are.

Because of the special toughness of the adhesive bead and the special however, geometric relationships also result small modifications of the geometry of the cutting knife used to considerable effects on the separation process.

The cutting knife 16 according to the invention shown in FIG. 2 is distinguished from the prior art in that his just formed mounting part 32 no straight side edges as in the prior art, but via a Bend 42 passes into the intermediate web 36.

The two side edges 38 and 40 of the fastening part 32 run starting from the fastening opening 18 in the direction of the intermediate web 36 so that the fastening part 32 to Intermediate web 36 tapers.

The offset 42 is now formed on the one hand by the fact that the side edge 38 of the fastening part 32 facing the cutting part 34 is slightly concavely curved in the region directly opposite the cutting part 34 with respect to the fastening opening 18, and on the other hand by the fact that on the cutting part 34 facing away from the side edge 40 shortly before the transition to the intermediate web 36 there is a greater curvature with a radius r ₁ that is smaller than the radius of curvature of the other side edge 38.

The cutting part 34 is curved in a sickle shape, the sickle curvature with respect to the mounting opening 18 in this Embodiment is concave.

The cutting part 34 has the fastening opening 18 on it facing side a cutting edge 44 and at its the fastening opening 18 facing away from another cutting edge 46, both sharpened from time to time while working can be.

The cutting edge 44 of the cutting part 34 facing the fastening opening 18 has a radius of curvature r ₂ which is significantly larger than the radius of curvature r _{1 of} the side edge 40 of the bend 42 on the fastening part 32.

These geometrical relationships are from a so-called settlement, which is designated as a whole by the number 47, and 4 is shown in more detail.

The development 47 is a flat blank (usually a stamped part), from which by double bending the U-shaped angled cutting knife around bending edges 48 and 50 16 is produced. The grinding of the cutting part 34 its two cutting edges 44, 46 is usually only after the bending process.

Due to the significantly smaller radius of curvature r ₁ on the side edge 40 in the region of the bend or bend 42 in relation to the radius of curvature r _{2 of} the cutting edge 44 of the cutting part 34, a particularly favorable geometry results, so that the fastening part 32 in the region opposite the cutting part 34, the 1 when working in the edge region of the disc 26 to be separated, is particularly slim. This simplifies work, in particular when guiding around corner regions of the pane 26 and supports the use of the oscillation stroke to cut through the adhesive bead 30.

In addition, the relative position of the cutting part 34 is related on the fastening opening 18 through the angular position of the bending lines 48, 50 influenced according to FIG. 4.

These can also be optimized with regard to the geometry.

An alternative embodiment of a cutting knife according to the invention is shown in FIGS. 5 and 6 and overall with number 16a.

The cutting knife 16a is again angled in a U-shaped cross section, 6, and has a fastening part 32a with a fastening opening 18a, an intermediate web 36a and a cutting part 34a.

The cutting part 34a is also curved in a crescent shape, wherein the sickle curvature with respect to the attachment opening 18a is concavely curved. At its mounting opening 18a facing On the side, the cutting part 34a has a cutting edge 44a with a serrated edge. On the of the Fastening opening 18a facing away from the cutting part 34a has a further cutting edge 46a, which however has a relative large tip angle α of at least about 30 °, preferably from about 40 ° to 50 °, as from the enlarged section can be seen by the cutting part 34a according to FIG. 7.

The serrated edge on the cutting edge 44a may preferably produced automatically using an NC-controlled grinding wheel become. Likewise, the cutting edges 44a with a Be ground.

Due to the serrated or saw cut, the cutting knife 16a a significantly improved cutting ability for cutting especially with a very tough material. Despite the serrated edge is a multiple manual regrinding during of use using the oscillating drive and Use of a grindstone possible.

The fastening part 32a in turn has an offset 42a on. However, in contrast to the previously based on the Fig. 2 to 4 described embodiment on both side edges 38a and 40a continuous curvatures in the area of Fastening opening 18a run around them or into one another pass. The side edge facing the cutting part 34a 38a of the fastening part 32a is in relation to the fastening opening 18a curved concavely. The side edge 40a on the Side of the fastening part 32a facing away from the cutting part 34a is convexly curved with respect to the fastening opening 18a, shows the same direction of curvature as that on the other Side edge 38a extending side of the fastening opening on.

In the lower half of FIG. 5, the part of the cutting part 34a belonging to the development 47a is shown by dash-dotted lines. Again, the cutting part 34a has on its cutting edge 44a facing the fastening opening 18a a considerably larger radius of curvature r ₂ than the radius of curvature r ₁ in the region of the offset 42a of the fastening part 32a.

The following are various possible cross-sectional shapes of the Cutting part explained with reference to FIGS. 7 to 10, in which a Cross section through the cutting part in a greatly enlarged representation is shown.

9 and 10 is a Cross-sectional shape, which is known per se in the prior art is.

9, the cutting part 34c is ground spherically on both sides and points at its two cutting edges 44c and 46c each with a serrated edge.

10, the cutting part 34d is on one side with a flat outer surface and crowned on the other side ground. This is only on the fastening part facing side a serrated edge on the cutting edge 44d formed while the other cutting edge 46d is being ground is.

7 and 8 are particularly preferred according to the invention Cross-sectional shapes of the cutting part shown by which has a significantly improved mechanical stability and lower susceptibility to breakage and on the other hand can achieve a significantly improved way of working, in particular a reduced susceptibility to immersion in the Adhesive bead.

In the embodiment according to FIG. 8, the cutting part 34b has one middle section 52b, which by parallel to each other Outer surfaces 54b, 56b is limited. To the two cutting edges 44b and 46b, this middle section 52b runs on both sides pointed and is on both cutting edges 44b and 46b with a Provide serrated edge.

The serrated edge is attached from both sides, so that the serrated edge is symmetrical.

7 follows a first Area 52a with mutually parallel outer surfaces 54a, 56a slightly tapering towards the end on both outer surfaces Section 58a so that the cutting part 34a at its the fastening opening 18a opposite side on both sides with a Relief grinding is provided. At its the mounting hole 18a facing away from this section 58a with an Provide cutting edge 46a which, as previously explained, is formed with a relatively large tip angle α.

Since the cutting part 34a is substantially at its attachment opening 18a facing cutting edge 44a and the other cutting edge 46a merely returns the cutting knife in an already severed part of the adhesive bead is supposed to enable an increased level in this area as well mechanical stability and thus reduced susceptibility to breakage of the cutting knife guaranteed.

Furthermore, the cutting edge 44a is different from the embodiment 8 only with a serrated edge on one side 44a.

7 is an alternative embodiment of the cutting part 34a at its end facing away from the fastening opening 18a with a dashed line 46 'indicated that the Cutting part 34a on this side only with a blunt Edge is provided. Provided that the repatriation is supported the cutting part in an already cut adhesive bead be dispensed with by at least a short cutting edge this version offers advantages because of a further improved stability of the cutting part.

Claims (10)

1. Cutting knife for a cutting tool (10) for severing sealing strips on windows (26) in motor vehicles with a U-shaped, angled cross-section, comprising a first leg formed as a securement portion (32, 32a) with a securement opening (18, 18a) for securing to an oscillatory drive unit (12) as well as a second leg formed as a cutting portion (34; 34a, b, c, d) and connected to the securement portion (32, 32a) by an intermediate bridge portion (36, 36a), wherein the securement portion (32, 32a) is formed to be flat and tapers from the securement opening (18, 18a) toward the intermediate bridge portion (36, 36a), characterized in that the securement portion (32, 32a) includes a bent section (42, 42a).
2. Cutting knife of claim 1, characterized in that the bent section (42, 42a) is provided at the end of the securement portion (32, 32a) toward the bridge portion (36, 36a).
3. Cutting knife of claim 1 or 2, characterized in that the bent section is formed in a region of a side edge (40, 40a) of the securement portion (32, 32a), the region being at the edge opposing the cutting portion (34a-d) and having a convex curvature with respect to the securement opening (18, 18a).
4. Cutting knife according to claim 1, 2 or 3, characterized in that the bent section is formed in a region of a side edge (38, 38a) of the securement portion (32, 32a), the region being at the edge facing the cutting portion (34, 34a-d) and having a concave curvature with respect to the securement opening (18, 18a).
5. Cutting knife of any one of the preceding claims, characterized in that the cutting portion (34, 34a-d) comprises a serrated or saw-like cutting edge on at least its side facing the securement opening (18, 18a).
6. Cutting knife of any one of the preceding claims, characterized in that the cutting portion (34a) at its side opposing the securement opening (18, 18a) comprises a cutting edge (46a) with a peak angle (α) of at least 30°.
7. Cutting knife of any one of the claims 1 to 5, characterized in that the cutting portion comprises a blunt edge (46') on its side opposed to the securement opening (18, 18').
8. Cutting knife for a cutting tool (10) for severing sealing strips (30) on windows (26) in motor vehicles, in particular according to one of the previous claims, with a U-shaped, angled cross-section, comprising a first leg formed as a securement portion (32, 32a) with a securement opening (18, 18a) for securing an oscillatory drive unit (12) as well as a second leg formed as a cutting portion (34, 34a) and connected to the securement portion (32, 32a) by an intermediate bridge (36, 36a), wherein the securement portion (32, 32a) is formed to be flat and to taper from the securement opening (18, 18a) toward the intermediate bridge, characterized in that the cutting portion (34a, b) has a cross-section with a central section (52a, b) defined by two parallel surfaces (54, 54b, 56a, b), which join at least on the end facing the securement opening into a cutting edge (44a, b) ground into a sharp angle.
9. Cutting knife for a cutting tool for severing sealing strips (30) on windows (26) in motor vehicles, in particular according to one of the claims 1 to 7, with a U-shaped, angled cross-section, comprising a first leg formed as a securement portion (32, 32a) with a securement opening (18, 18a) for securing an oscillatory drive unit (12), as well as a second leg formed as a cutting portion (34a) and connected to the securement portion (32, 32a) by an intermediate bridge (36, 36a), wherein the securement portion (32, 32a) is formed to be flat and to taper from the securement opening (18, 18a) toward the intermediate bridge (36, 36a), wherein the cutting portion (34a) is provided with a cutting edge (44a) on its side facing the securement opening (18, 18a), characterized in that a section (52a) with parallel surfaces (54a, 56a) joins into the cutting edge (44a), the section joining at the other end into a slightly crowned or conical section (58a).
10. Cutting knife of claim 8 or 9, wherein the cutting portion (34a, b, c, d) comprises a cutting edge (46a, b, c, d) with a serrated or saw-like structure on at least its side opposing the securement opening (18, 18a).

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