EP3643465B1 - Hand-held cutting planer - Google Patents

Description

The invention relates to a hand tool cutter according to the preamble of claim 1.

The invention hereby relates to a hand tool which is particularly suitable for cutting paper, cardboard or even plastic and which is in relation to known hand tools with an adjustable and replaceable cutting blade, which have also found widespread use in the market as carpet or cutter knives, for example. These are cutting devices which have a handle, which also contains a holder for an exchangeable, usually trapezoidal cutting blade, which is held rigidly or so that it can be sunk in the handle.

Examples of such devices can be found, for example, in the publications EP 0 196 437 A2 and EP 0 451 544 A2

In addition to these known, simple hand tools, more complex cutting devices are known in the prior art which, as a rule, allow precise cutting of straight cuts, guided by rails. Such more complex devices usually include, on the one hand, the rail-like guides that are placed or also fastened on a flat object to be cut or on a base and a rail connector attached to a device which engages in this rail guide and a corresponding cutting device which then moves along this rail cutting underground is performed cutting.

Examples of such devices can be found in the publications DE 36 24 429 C1 and WO 2012/020330 A1 .

Another example is that from the publication DE 10 2015 110 311 A1 Known device for cutting a plasterboard with a carriage with a cutting blade, which can be brought from a first rest position into a working position for cutting through a layer of cardboard so that the plasterboard can be broken around a broken edge, and with a second blade, which can be brought into a second working position to cut through the other cardboard layer along the break edge. A guide rail for the device is provided on the surface of the workpiece.

The disadvantage of the present state of the art is that there are only on the one hand complex system solutions such as the above-mentioned disclosures on the market, which mean relatively inflexible work, since the combination of guide rails and cutting device is an expensive and complex one and flexible use of these tools, for example not possible even on an uneven and / or soft surface.

On the other hand, these elaborate solutions are only opposed to very simple hand-held devices, which are particularly problematic in that they allow only insufficient guidance of the blade in the case of documents to be cut that have to be cut with a certain pressure force over a longer distance. In addition, there is usually the problem that these cutting tools, such as carpet knives, can only be guided with one hand, which leads to on the one hand worsens the possibility of applying force and on the other hand it also has the effect that the free hand is usually used as a guide hand and injuries can occur here when working inappropriately.

A further disadvantage of known hand tools for cutting is that the cut with a carpet knife, for example, is always made towards the user. This means that a pulling cut is made to the body of the person using the carpet knife, which is problematic on the one hand because the blade points towards the user, and on the other hand it also involves the problem that when a cut is made over a longer distance, the user is at the same time Cutting must move backwards at the same time, which also carries the risk of injury.

A cutting movement along an industrial paper roll is mentioned as an exemplary application to illustrate these deficiencies. Here it is necessary to remove paper residues that are still on a carrier roll by cutting over the entire width of this paper roll and thus to expose this carrier roll again. This results in the problematic state described above that the person cutting has to move on this uneven and possibly flexible surface with one hand and a carpet knife, while at the same time moving backwards in order to make a cut across the entire width of the roll to be able to perform. This requires both skill and strength and can easily lead to accidents at work that must be prevented.

In order to avoid a fixed free blade in this field of application, it is also known to construct carpet knives in such a way that the cutting blade is only extended when a lever on the carpet knife is pressed and only then can a cutting movement be performed. This is to prevent the stationary blade that has moved out of the carpet knife from causing injuries, for example when reaching for the knife with the blade still extended.

However, this blade, which can be extended via a mechanism, only makes the handling of this carpet knife even more difficult, since the cutting process can only be carried out if the corresponding lever-like element on the handle of the carpet knife is simultaneously actuated to extend the blade, forming a fist. The cutting pressure must then in turn be carried out against this leverage, which is why it is necessary to grip the knife very firmly, which on the one hand means a greater expenditure of force and on the other hand also makes it difficult to handle these knives. This, in turn, can lead to accidents at work.

The object of the present cutting planer hand tool is therefore to create an alternative, in particular to simple cutter or carpet knives, which enables safe working with a sharp cutting blade even over an uneven or flexible surface. At the same time, the aim is to ensure that there is no fixed blade, but rather the blade is only guided out of the hand tool during the work process and is automatically inserted into the hand tool when not in use. Finally, the aim is to create a device which, on the one hand, offers the possibility of working in front of the body, that is, to carry out a cutting movement away from the user and, on the other hand, allows this to be done with very good manageability and a good application of force on this hand tool.

This is achieved with the cutting planer hand tool according to claim 1.

The further claims relate to advantageous designs of this hand tool.

According to the invention, this object is achieved in that the cutting planer hand tool has a base body which, in an advantageous embodiment, as a housing is trained. At the same time, this base body forms a sliding surface with which the hand tool can be safely and stably guided over the substrate to be cut. This already makes a difference to the usual hand tools in the form of carpet or cutter knives, which have to be guided over a surface without any guidance. However, it is also a difference from the complex solutions described above, since these must necessarily be guided on rails, which in the present case are not absolutely necessary due to the safe handling, which is to be discussed in the following.

Two handles are arranged on the base body, a front first handle that is only firmly connected to the base body, and another rear holding and guide handle spaced apart from the front handle, whereby this hand tool is basically guided with two hands in front of the body. This basic structure already ensures that a hand tool has been created which can be guided very safely and with force by the user in front of the body.

The question of how the actual cutting process occurs is particularly relevant to the invention. This is achieved in that a cutting arm is articulated on the base body or alternatively in the housing forming the base body, which cutting arm can assume an upper protective position and a lower cutting position. According to the invention, this articulated cutting arm is articulated in the front area on the base body or in the housing and can therefore be transferred from the protective position to the cutting position with the free movable end located at the rear end of the hand tool.

For this reason, a vertically extending cutting blade is arranged in the rear area of the cutting planer hand tool, which protrudes from the cutting arm pointing downwards. In the upper protective position, the cutting arm is located with its free end on the upper edge of the housing or of the base body and thus also the cutting blade on the underside is raised to such an extent that it is arranged above the sliding surface on the base body or in the housing.

The cutting process is now achieved in that the already mentioned holding and guide handle is pressed down on the base body or guided into the housing during the actual cutting process, since this second holding and guide handle is arranged directly on the top of the cutting arm and thus this free end of the cutting arm emotional. As a result of vertical pressure on this holding and guide arm, this free end of the cutting arm is transferred into a lower cutting position in which the cutting blade protrudes from the underside of the housing or from the lower edge of the base body. Only now can a cutting process take place.

That is, by engaging the holding and guide handle at the rear end of the cutting plane and pressing it against the material to be cut, the cutting arm with the cutting blade is lowered and this blade penetrates, for example, into the paper to be cut. Thus, the rear holding and guide arm achieves the secure grip of the entire cutting planer hand tool, but at the same time also provides firm pressure on the base and can be pushed together with the front handle in front of the user's body.

This means that the cutting edge of the blade arranged on the cutting arm is oriented towards the front handle of the user, which is why the user can push the cutting plane in front of him and guide it across the ground while applying strong pressure via the rear holding and guide handle and with the second hand makes the thrust via the front handle, whereby the hand tool can be guided safely and stably over the ground due to the design with a lower sliding surface. In this way, the disadvantages mentioned are better known according to the invention Cutting devices in the manner of box knives were bypassed and a hand tool was newly created that is advantageous both in terms of occupational safety and in terms of efficiency.

In the following, an embodiment of the invention is explained in more detail with reference to drawings.

Figur 1

eine seitliche Ansicht des Schneidhobels mit dem Schneidarm in Schutzstellung,

Figur 2

eine seitliche Ansicht des Schneidhobels in Schneidstellung in der Anwendung sowie

Figur 3

eine ausschnitthafte seitliche Ansicht des hinteren Bereichs des Schneidhobels rückseitig.

Figur 4

eine seitliche Ansicht des Schneidhobels mit dem Schneidarm in Schutzstellung sowie einem Arretierungskörper zur Sicherung des Schneidarms sowie

Figur 5

eine ausschnitthafte seitliche Ansicht des hinteren Bereichs des Schneidhobels mit einer speziellen Haltearretierungsvorrichtung mit Flügelmutter.

Show it:

Figure 1

a side view of the cutting plane with the cutting arm in the protective position,

Figure 2

a side view of the cutter in the cutting position in use as well

Figure 3

a partial side view of the rear area of the cutting plane from the rear.

Figure 4

a side view of the cutting plane with the cutting arm in the protective position and a locking body for securing the cutting arm as well

Figure 5

a partial side view of the rear area of the cutting plane with a special retaining device with wing nut.

the Figures 1 and 2 When viewed together, they illustrate how the function of the cutting plane is designed in such a way that, on the one hand, the actual function of cutting is solved in an ideal way, since the plane is very easy to grip and guide. On the other hand, however, also how the protective position of the cutting blade, which is relevant to the invention, is achieved in such a way that the cutting blade only emerges from the underside of the sliding surface of the planer when the cutting plane is actually used.

If you first look at the representation in Figure 1 , it is the cutter that is in the protective position because the cutter is unused. It is clear that here the cutting arm 3 and the cutting blade 14 are raised and are located above the sliding surface 12 forming the lower edge of the cutting plane. The present design shows the cutting plane according to the invention in a design in which the cutting arm 3 is arranged completely in a housing 13.

As shown in this exemplary illustration, this can be made of a transparent polycarbonate such as Makrolon, so that the functional elements of the cutting plane are always visible. This is particularly advantageous when changing the blade, since the structural components are always visible to the user. The polycarbonate has proven to be particularly suitable because of its material properties, since it is easy to shape, which is advantageous for the front rounding of the housing. In addition, it is easy to process and durable, which extends the life of the hand tool.

In terms of handling, it is noticeable that the planer has an elongated shape typical of a plane, with handles for both hands so that the plane can be safely guided. The front side has a rounding starting from the sliding surface 12 which, particularly when cutting softer materials such as paper, prevents the hand tool from canting due to the required pressure or from penetrating the substrate to be cut. The sliding surface 12 is thus extended from the horizontal to the vertical.

One can see the handle 17 firmly connected to the plane in the front area and thus at the front end of the base body 13 as well as the guide handle 7 arranged at the rear end of the cutting plane, which is directly connected to the cutting arm 3 and through a corresponding opening on the top 18 'is guided into the housing 13.

The central technical element is the pivotable cutting arm 3 guided in the housing 13, which is fastened at a fastening point 9 transversely to the longitudinal direction of the cutting planer housing 13. It will be in the Figures 1 and 2 the two operating states of the cutting planer clearly, namely in Figure 1 the protective position in which the cutting arm 3 is raised to an upper position by a return spring 4, so that a cutting blade 14 arranged at the free end of the cutting arm 3 is raised into the housing 13 and does not exit the housing 13 on the underside. In this protective position, injury to this hand tool is therefore not possible.

The restoring spring 4 is supported on the one hand on the housing 13 and on the other hand in a receptacle 5 on the cutting arm 3, from which a holding body 6 protrudes, so that the restoring spring 4 is firmly supported between the housing 13 and this holding body 6 on the cutting arm 3 and so the Spring force can act on the cutting arm 3.

If you look now Figure 2 and the operating state shown here, the cutting arm 3 is now manually operated in a lowered cutting position, which is characterized in that a cutting edge 15 of the cutting blade 14 emerges from an opening in the housing 13 on the underside and thus engages in the area of the sliding surface 12. If the cutting plane is guided over a paper web, for example, the cutting edge 15 engages in the material to be cut and performs a cut that is defined according to the cutting depth.

The cutting depth itself is adjustable through a bore 19 in the cutting arm which leads into the receptacle 20 of the cutting blade 14. In this bore 19 there is an adjustment body 2 which engages the cutting blade 14, which is particularly evident in FIG Figure 3 can be seen in more detail. By screwing this adjusting body 2 further into the bore 19, the cutting blade 14 can, for example, be extended further and thus the cutting depth of the cutting edge 15 can be increased.

In the Figures 1 and 2 a disk-shaped magnet 8 which is arranged in the cutting arm 3 and which serves to releasably fix the cutting blade 14 inserted in the receptacle 20 in this position can also be seen. This has particular advantages when changing the blade, since the cutting blade 14 used is held directly by the magnet 8 before it is rigidly fixed by an additional fastening means 10.

This leads to the consideration of the Figure 3 9, which is a rear view of the rear of the cutter plane. We are particularly looking at the mounting of the cutting blade 14 in relation to it Figure 1 and 2 rear view. Here it becomes clear that at the position in Figure 1 and 2 the disk-shaped magnet 8 is arranged on the opposite side of the cutting blade 14, a fastening means 10, in this exemplary design of a retaining screw, is provided.

Figure 3 In particular, this illustrates a special function that is intended to facilitate blade replacement or blade adjustment. It is shown here that a locking body 18 engages in a corresponding receptacle 1 in the cutting arm 3, for which purpose it is guided through a corresponding opening in the housing. In this way, the locking body 18, which in this case is screw-like, can engage in a thread in the receptacle 1 in the cutting arm 3 and fix it in the lowered cutting position against the restoring force of the restoring spring 4, which is compressed in this position. The locking body 18 and the fixing of the cutting arm 3 in its lower position make it easy to access the cutting blade 14, which is particularly advantageous when changing blades.

A lateral opening 11 is also shown in the housing 13, which enables access to the fastening screw 10 with which the cutting blade 14 is fixed in its receptacle 20. This means that after the cutting arm 3 has been locked in a lower cutting position, the fastening means 10 can be accessed through the opening 11 , this can be opened and the cutting blade 14 removed from its receptacle and replaced, for example, with a new blade. After the new blade has again been locked with the fastening means 10, the locking body 18 can be released again, the return spring 4 is decompressed and the cutting arm 3 swings back into its upper protective position.

In the Figures 1 and 2 an expedient arrangement of this locking body 18 is also shown on the front of the cutting plane. A holding receptacle 22 is provided here, into which the locking body 18 is detachably inserted so that it can only be removed when required and used to fix the cutting arm 3 as described above.

These constructive means ensure that in practice it is ensured that, on the one hand, injury to the cutting blade 14 when the cutting plane is not used is excluded because the internal cutting arm 3 is always in the protective position and therefore no cutting blade 14 is off exits the housing.

On the other hand, however, the special constructive means of locking the cutting arm 3 in its lower cutting position mean that when a cutting blade 14 needs to be changed, this is simplified by these constructive measures and the risk of injury is thus also minimized here.

An alternative structural solution for locking the cutting arm 3 both in an upper protective position and in the lower cutting position is the Figure 4 refer to. Figure 4 shows an additional structural arrangement on the housing of the cutting plane, namely a spring body 24, for example designed as a spring steel strip, at the free end of which a handle 25 is arranged, here exemplarily designed as a button.

Below the handle 25 in a position not shown in the drawing there is a rod-like mandrel, the can engage in an upper opening 26 and a lower opening, the lower opening in the solution shown in the drawing Figure 4 is covered by the spring body 24 itself, since the rod-like mandrel engages in this in the position shown. The spring body 24 is hinged to the housing with a fastening screw arranged at its rear end in such a way that it can be pivoted around this fastening point between the upper position with engagement in the opening 26 and the lower position, for which the handle 25 and the rod-like mandrel are gripped can be seen from the lower or upper opening 26.

Due to the spring steel-like construction, when the opening 26 is reached, the rod-like mandrel is automatically pressed into it, inserted into the housing in the transverse direction and releasably fixed there. In the representation after Figure 4 it can be seen that the position of the rod-like mandrel, which engages through the lower opening in the housing in a section below the pivotable cutting arm 3, prevents the cutting arm 3 from being lowered into its lower cutting position. Conversely, when the rod-like mandrel is inserted into the upper opening 26 when the cutting arm 3 is lowered, it cannot be swiveled back into the upper protective position. This position can therefore be used to change blades, for example.

Another variation found in Figure 4 As can be seen, there is a special form of the cutting blade 14 in which the tip of the cutting blade 14 is beveled. In this way, a blade is built in which is reduced in cutting depth compared to a complete cutting blade 14, so that this device can be used even more gently and in a more controlled manner for the material to be cut.

Finally shows Figure 5 another constructive solution to fix the cutting arm 3 in a certain position. For this purpose, the locking body 10 is arranged on the cutting arm 3 and designed as a combination of one on the Screw attacking the cutting arm, for example with a wing nut head and a knurled nut 23 guided on the same screw thread.

The knurled nut 23 can be brought to the housing on the screw connected to the cutting arm and serving as a locking body 10 for the cutting blade 14 and, when this knurled nut is tightened firmly, causes the cutting arm 3 to be fixed in a certain position relative to the housing. This enables stepless adjustment, which can also be used, for example, to determine the cutting depth.

In addition, it is possible in this way to fix the cutting arm 3 in a lowered position for changing the blade. The solution here has the advantage that it serves both to attach the cutting blade 14 to the cutting arm 3 and enables the mentioned function of fixing the cutting arm 3 in an upper or lower position.

Claims (15)

1. Hand-held cutting planer comprising a main body with a first holding handle (17) and a sliding face (12) on the underside,
   characterized by

   - a cutting arm (3) arranged in an articulated manner on or in the main body,

   - a cutting blade (14) being arranged for the one part at the free end of said cutting arm (3), and

   - a second holding and guiding handle (7) that guides the cutting arm (3) acting for the other part on said cutting blade (14),

   - wherein the cutting arm (3) has an upper protective position with the cutting blade (14) above the sliding surface (12) and a lowered cutting position with a cutting edge (15) of the cutting blade (14) beneath the sliding surface (12).
2. Hand-held cutting planer according to Claim 1,
   characterized in that

   - the cutting arm (3) is supported on or in the main body by means of a restoring spring (4) in the upper protective position,

   - and this restoring spring (4) is in a compressed state in the lowered cutting position.
3. Hand-held cutting planer according to Claim 1 or 2,
   characterized in that

   - the main body is in the form of a housing (13) in which the cutting arm (3) extends in a manner articulated at a fastening point (9) and is guided into the upper protective position in the housing (13) by the restoring spring (4),

   - wherein, in the lowered cutting position, the cutting arm (3) is in a state lowered to the housing underside having the sliding face (12) and a cutting edge (15) of the cutting blade (14) emerges from an opening (16) in the underside of the housing (13).
4. Hand-held cutting planer according to Claim 3,

   characterized in that

   the holding and guiding handle (7) extends through an opening (18') in the top side of the housing (13) of the main body and is in a state lowered into this housing (13) in the cutting position.
5. Hand-held cutting planer according to one of the preceding claims,

   characterized in that

   the cutting arm (3) has a receptacle (1) in which a locking body (18) for fixing the cutting arm (3) in the upper protective position or in the lower cutting position engages.
6. Hand-held cutting planer according to one of the preceding claims,
   characterized in that

   - the cutting arm (3) has a receptacle (20) for the cutting blade (14)

   - and a threaded bore (19) extends into this receptacle, in which an adjusting body (2) that acts on the cutting blade (14) is guided,

   - wherein the cutting blade (14) is held in a displaceable manner in the receptacle (20) for setting the cutting depth.
7. Hand-held cutting planer according to Claim 6,

   characterized in that

   an aperture (21) in the top side of the housing (13) is arranged such that the adjusting body (2) is accessible for a tool.
8. Hand-held cutting planer according to Claim 6 or 7,

   characterized in that

   a magnetic retaining body (8) for releasably fastening the cutting blade (14) in the receptacle (20) is arranged in the receptacle (20).
9. Hand-held cutting planer according to one of the preceding Claims 3 to 8,
   characterized in that

   - a fixing body (10) for locking the cutting blade (14) is arranged in the cutting arm (3),

   - and, with the cutting arm (3) lowered, is accessible via an aperture (11) arranged in the side of the housing (13).
10. Hand-held cutting planer according to Claim 9,
    characterized in that

    - the fixing body (10) is in the form of a screw that passes out of the side of the housing (13) and extends, in a manner following the pivoting movement of the cutting arm (3), in the aperture (11) in the form of a cutout (28),

    - wherein a knurled nut (23) is guided on the thread of the fixing body (10), the diameter of said nut (23) being greater than the width of the cutout (28), with the result that the knurled nut, in a lowered position, bears on the housing (13) in a manner fixing the fixing body (10) and the cutting arm (3).
11. Hand-held cutting planer according to one of the preceding claims,

    characterized in that

    the locking body (18) is fixed in a releasable manner in a retaining receptacle (22) in the main body.
12. Hand-held cutting planer according to one of the preceding claims,

    characterized in that

    the sliding face (12) is formed in a rounded manner rising towards the upper edge at its front end, beneath the holding handle (17).
13. Hand-held cutting planer according to one of the preceding claims,

    characterized in that

    the main body (13) is made of polycarbonate.
14. Hand-held cutting planer according to one of the preceding claims,

    characterized in that

    the cutting blade (14) has a bevelled front tip for reducing the cutting depth.
15. Hand-held cutting planer according to one of the preceding claims,
    characterized in that

    - a spring body (24) is articulated in a pivotable manner on the side of the housing (13),

    - with, for the one part, a handle (25) and, for the other part, a rod-like peg oriented towards the housing (13) being arranged at the free pivotable end of said spring body (24),

    - wherein an upper aperture (26) and a lower aperture in the housing (13) are arranged such that the rod-like peg can engage therein transversely to the cutting arm (3),

    - with the result that the cutting arm (3) is fixed in the upper protective position when the rod-like peg engages in the lower aperture or in the lower cutting position when the rod-like peg engages in the upper aperture (26).

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