EP1232839A1 - Cutting tool with a linear oscillating drive - Google Patents

Abstract

A cutting tool with a linear oscillating drive has a handle body (1) and a knife (3, 4) which is guided therein and is displaceable in an oscillating manner in the longitudinal direction, the knife (3, 4), by means of a knife holder (4), being detachably connected via a clamping member to a transmission element, arranged in the handle body (1), of the linear oscillating drive. Since the knife holder (4) is cohesively connected, in particular sealed, together with a knife shaft (31), the cutting tool complies with the hygiene regulations for use in the foodstuffs sector.

Description

The invention relates to a cutting or sawing tool with a Linear vibratory drive according to the preamble of patent claim 1.

Hand tools with a pneumatic linear vibratory drive are known for example from DE-A-197'46'447, these for filing, Sawing, polishing or cutting can be used. The Vibratory drive has a slidably mounted in a handle body Piston with a piston rod on its free end a tool holder is attached. The piston is generally driven by a flap valve.

In DE-A-2'939'896 the tool holder for such a Hand tool disclosed in more detail. It essentially consists of one Base body with a T-shaped cross section, on the front and rear end clamping pins are formed. The tool holder has a through hole in which of one side a tool shank and the other side the Piston rod of the linear vibratory drive are introduced. shaft and piston rod are in the clamping pin by means of clamps fixable. The tool holder is in a C-shaped, on the handle body arranged bearing piece stored. The bearing piece takes forces acting transversely to the direction of movement of the tool, so that the bearings of the piston rod inside the housing are relieved become.

Such hand tools are used as cutting tools, in particular Knives or saws, insufficient for the food sector suitable because the tool holder gets dirty quickly and is difficult to clean. Hygiene regulations are thus not fulfilled. Also impair in the tool or knife holder fixed cut remains the functionality of the Tool.

Furthermore, when using knives, especially large ones Butcher knives or saws, due to the longer lever arm and laterally due to the larger surface of the knife Forces that are insufficient from a C-shaped bearing piece can be included. The knife "flutters" high stress.

It is therefore an object of the invention to provide a cutting tool to create with a linear vibratory drive, which also in Food sector can be used.

This object is achieved by a cutting tool with the features of the claim 1.

It is another object of the invention to provide a cutting tool to create which can withstand high lateral loads.

This object is achieved by a cutting tool with the features of the patent claim 7th

According to the invention, the knife holder and knife shaft are integral connected to each other, especially shed. knife blade and knife holder can thus be removed together for cleaning remove their grip body.

It is advantageous that there are knife blades from series production let use. This is particularly advantageous because because the knives have to be replaced frequently.

The knife holder preferably has a substantially cuboid shape Base body, which in a rectangular Knife guide of the handle body is slidably mounted. Thereby can also occur with large and long knives Take up lateral forces from the knife guide in order to Relieve the transmission element of the linear vibratory drive.

A knife guide, which is in one piece and a receiving opening with rounded corners for the base body, allows an inexpensive manufacture.

Are the outer corners of the body and the inner corners the knife guide rounded with different radii of curvature, so when the knife is tilted or twisted prevent large destructive forces in the corner areas of the camp.

Further advantageous embodiments can be found in the dependent ones Claims.

Figur 1

eine perspektivische Darstellung eines Schneidwerkzeugs gemäss der Erfindung;

Figur 2

eine Messerführung gemäss Figur 1;

Figur 3

ein Messer mit einer Messerklinge und einem Messerhalter gemäss Figur 1;

Figur 4 und 6

ein Messerhalter gemäss Figur 3 und

Figur 5

einen Querschnitt durch den Messerhalter und die Messerführung gemäss Figur 1 in vergrösserter Darstellung.

The subject matter of the invention is explained in more detail below on the basis of an exemplary embodiment which is illustrated in the accompanying drawings. Show it

Figure 1

a perspective view of a cutting tool according to the invention;

Figure 2

a knife guide according to Figure 1;

Figure 3

a knife with a knife blade and a knife holder according to Figure 1;

Figures 4 and 6

a knife holder according to Figure 3 and

Figure 5

a cross section through the knife holder and the knife guide according to Figure 1 in an enlarged view.

In Figure 1 is a cutting tool according to the invention with a Linear vibratory drive shown. It essentially exists of a handle body 1 and a guided therein, in the longitudinal direction of the handle body 1 oscillating knife, by which in FIG. 1 is the knife blade 3 with its cutting edge 30 is visible. The linear vibratory drive arranged in the handle body 1 is like in the prior art mentioned at the beginning built up and is therefore not described again here.

The knife is in a knife guide fixed in the handle body 1 2 stored. The knife guide 2 according to Figure 2 consists of a hollow body with an essentially cake-shaped cross section. It is preferably made of aluminum with a hard-coated Coating as this repels protein and therefore is particularly suitable for use in the food sector. One surface of the knife guide 2 is from a threaded hole 20 penetrates, which allows the knife guide 2 by means of a screw on the handle body 1. Furthermore, in figure 2 a groove 21 is made on this surface. This is optional. The knife guide 2 is preferably made in one piece. It has an essentially rectangular receiving opening 22 and one running in the longitudinal direction up to the Receiving opening 22 protruding slot 23. The slot 23 is arranged on the threaded bore 20 opposite side.

As shown in FIG. 3, the knife consists of a metal Knife blade 3 with an integrally formed shaft 31 and a Knife holder 4 cohesively connected to the shaft 31 Knife blade 3 is a commercially available part, which for the desired Is suitable.

The knife holder 4 has, according to FIGS. 4 and 6, an im essentially cuboid base body 40 and an integrally formed thereon Clamping pin 41 on. The base body 40, here also the Clamping pin 41, preferably consists of a plastic good sliding behavior, especially made of carbon fiber reinforced polyamide 6th

The clamping pin 41 has a bore 45 for receiving one here Not shown transmission element of the linear vibratory drive on. The transmission element is preferred a piston rod. However, other types of transmission are also possible. The piston rod is in the clamping pin 41 by means of a also not shown clamp with clamping screws releasably fixed. To enable insertion and clamping, the clamping pin 41 has a lengthwise direction Slot 41 'on. So that the clamp is not in Moves in the longitudinal direction, the clamping pin 41 has on his end facing away from the base body via a circumferential bead 41 ". Furthermore, as can be seen in FIG. a knob 44 is formed, which serves as an anti-rotation device for the Clamp serves.

The base body 40 has a knife holder 42 for receiving of the knife shank 31. This knife holder 42 is preferably an elongated opening. In the manufacture of the The shaft 31 of the knife blade 3 is now inserted into the knife holder 42 introduced and the front with this material connected, preferably shed. This is advantageous a plastic with good sliding properties, in particular Polyurethane (PU) used.

For the operation of the cutting tool, the knife with its Knife holder 4 inserted into the knife guide 2 and on the piston rod fixed. The rear part of the cutting edge 30 of the Knife 3 protrudes from slot 23 of knife guide 2. In a preferred embodiment shown here has the receiving opening 22 of the knife guide 2 as well as the basic body 40 of the knife holder 4, which is mounted therein, is rounded Corners on. The corners of the base body 40 have a larger one Radius of curvature than the corners of the receiving opening 22. The difference is typically 10%, for example the radii of curvature at least approximately 5 mm or 5.5 mm. This makes it possible to achieve a twist angle α or a tilt of the knife of up to 0.5 ° Most of the forces on lateral sliding surfaces 40 'of the base body 40 transferred to the side sliding surfaces of the knife holder 2 and the curved areas do not become excessive Are exposed to forces. This rectangular storage with rounded Corners can also be fixed with a different tool attachment use. For example, in DE-A-2 ' 939'896 described bearing piece by the knife guide and Replace the tool holder with the knife holder, in which If the knife holder has a clamping pin on both sides is.

Thanks to the inventive connection of the knife blade with the Knife holder, an easy-to-clean tool is created, which in the fastening area of the knife in the handle body essentially closed surface exposed to the clippings having. In the above description an example with a knife blade explained. The knife blade can, however without structural changes from a saw blade or another Replace material cutting tool.

LIST OF REFERENCE NUMBERS

1

handle

2

knife guide

20

threaded hole

21

groove

22

receiving opening

23

slot

3

knife blade

30

cutting edge

31

diameter shaft

32

move

4

knife holder

40

body

40 '

sliding surface

41

clamping pins

41 '

slot

41 ''

bead

42

knife receiver

44

stop knobs

45

drilling

α

Twist angle

Claims (9)

Cutting tool with a linear oscillating drive, the cutting tool having a handle body (1) and a knife (3, 4) guided therein and oscillating in the longitudinal direction, the knife (3, 4) using a knife holder (4) with a knife in the handle body (1) arranged transmission element of the linear oscillating drive is releasably connected via a clamping member, characterized in that the knife holder (4) is integrally connected to a knife shaft (31) of the knife (3, 4). Cutting tool according to claim 1, characterized in that the knife holder (4) consists of an essentially cuboid base body (40) and a clamping pin (41) formed thereon. Cutting tool according to one of claims 1 or 2, characterized in that a base body (40) of the knife holder (4) has a knife holder (42) for inserting a blade (3) of the knife, the knife holder (42) being cast when the blade is inserted is. Cutting tool according to claim 3, characterized in that the knife holder (42) is cast with polyurethane (PU). Cutting tool according to claim 2, characterized in that the base body (40) consists of polyamide 6 reinforced with carbon fibers. Cutting tool according to claim 1, characterized in that a positionally stable knife guide (2) is arranged in the handle body (1) and has a substantially rectangular receiving opening (22) for receiving the knife holder (4). Cutting tool according to claims 2 and 6, characterized in that the base body (40) and the receiving opening (22) have rounded corners, the corners of the base body (40) having larger radii of curvature than the corners of the receiving opening (22). Cutting tool according to claim 2, characterized in that the knife guide (2) has a slot (23) through which a rear part of the knife blade (3) protrudes. Knife (3, 4) for a cutting tool according to one of claims 1 to 8 with a knife blade (3) with a knife shank (31) for detachable connection to a handle body (1) of the cutting tool, characterized in that the knife shank (31) with a knife holder (4) is integrally connected.

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