DE29722232U1 - Indexable knife for shredding devices - Google Patents

Description

1. Wissing, Johannes, Zwillbrockweg 2, 48691 Vreden

2. Wissing, Heinrich, Zwillbrockweg 2, 48691 Vreden

"Reversible blade knives for shredding devices" 5

The innovation concerns a reversible blade for shredding devices.

Shredding devices are already known in practice that have a rotating drum on which knives are arranged, and these knives mounted on the drum are assigned fixed knives or cutting edges at the desired distance. With such shredding devices, many different materials are shredded, for example wood waste, plastic waste, carpet remnants, etc.

The knives mounted on the drum are detachably connected to the drum and can be turned or replaced with new knives after the knives have become blunt. Therefore, these knives are called "reversible knives".

plate knives". In order to connect these indexable plate knives to the drum, it is known to equip these indexable plate knives with a hole that is provided with a thread and through this hole the indexable plate knives can be connected to the drum with a screw.

become.

Particularly under high loads, it can happen that the indexable insert blades in the area of the bore break and are therefore destroyed, whereby the loose

The loss of a defective knife can lead to further damage to the rest of the shredding system. In addition, the loss of a defective knife is undesirable and leads to an unsatisfactory working result of the shredding machine and to increased work effort for the replacement

of the defective knife.

The innovation is based on the task of developing an indexable insert knife that works reliably even when large forces are applied to the indexable insert knife and is less susceptible to defects than the indexable inserts known to date.

knife.

This problem underlying the innovation is solved by the teaching of the characterizing part of the main claim.

In other words, the well-known reversible blade knife is reinforced in the area where it is attached to the drum, so that this knife offers increased resistance to the forces that occur.

Advantageous embodiments of the innovation are explained in the subclaims.

An example of the innovation is shown in the drawing

, whereby a reversible blade 1 consists of a blade block 2, which advantageously consists of hardened tool steel. The reversible blade 1 has a square outline in this embodiment, but it can also have other rectangular or other geometric

have metric floor plans, e.g. a round floor plan.

In order to attach the indexable insert knife 1 to a rotating drum, it has a through opening 3 which is

its inside is provided with a thread 4 to guide a screw bolt through the indexable insert knife 1 and then fasten it to the drum.

In the area of borehole 3, the previously known

Indexable blade 1 may sometimes crack if particularly

high forces were present during the cutting process of the indexable insert knife. Now a bead-like elevation 5 is formed around the bore 3, which also has a thread on its inside, namely an extension of the thread 4, so that the thread 4 becomes longer overall and therefore the

can better absorb and distribute occurring forces.

The outer flanks 6 of the elevation 5 are not designed to run vertically downwards, but run at a flat angle downwards until they reach the bottom surface 7 of the upper

side of the indexable insert knife 1. From this slightly lower base surface 7, at least the four outer corner points 8 to 11 of the indexable insert knife 1 are raised and the height of the elevation 5 is in this embodiment such that it is less than the

height of the corner points 8 to 11 in order to prevent damage to the elevation 5 during the working process of the indexable insert knife 1.

Claims (1)

"Reversible blade knives for shredding devices" Protection claims: Indexable insert knife with a bore equipped with an internal thread for fastening the indexable insert knife on a rotating drum of a comminution device, characterized by a raised portion (5) arranged at least on one surface, which surrounds the bore (3) and in which the thread (4) of the bore (3) is formed in an extended manner. Indexable insert knife according to claim 1, characterized by the corner points (8-11) of at least one upper side of the indexable insert knife (1) which are opposite a bottom surface of the upper side side of the indexable insert knife (1) are raised. 3. Indexable insert knife according to claim 2, characterized by the elevation (5) which is lower than the corner regions (8-11) of the indexable insert knife (1). 4. Indexable insert knife according to one of the preceding claims, characterized by the elevation (5) whose side flanks (6) are designed to slope outwards at a shallow angle. 5. Indexable insert knife according to one of the preceding claims, characterized by a rectangular plan.