DE373324C - Crust and weed cutter with height-adjustable knives - Google Patents

Description

August Matulle in Bad Schmiedeberg, 'Bez. Hall a. S.

Crust and weed cutter with height-adjustable knives.

Patented in the German Empire on May 11, 1921.

They are agricultural implements known for loosening the soil and removing the weeds at the same time, to loosen the top layer of a field; this is how you work with cultivators, Cultivators, scrapers, etc. However, all of these devices have the disadvantage that they are loosening of the ground only in certain stripes, while in other places one

ίο There is no loosening at all and, moreover, the weeds still remain. If these instruments do not go too deep, then they have no effect · If they are placed deep, they cause excessive drying of the soil, from which too much moisture is then withdrawn. The object of the invention relates to a crust cutter or weed cutter, the knives of which are provided with movable cutting edges, the previously set depth never being exceeded, so that the underlying soil remains untouched and retains its moisture. The top layer of the soil ^r w ill be loosened by one-time processing, and freed from weeds, which is collected and allowed to dry.

The invention is shown in the drawing in a practical embodiment. Fig. Ι shows a side view, Fig. 2 is a plan view.

The cutter consists of a three- or four-wheeled frame h, under which two long knives b are mounted in a wedge shape, which end in a common share point α at the front.

The knives can each be rotated in joints c in order to be able to form an acute or obtuse angle with them, depending on the incrustation or weeds of the field; according to the invention, they are provided with a movable cutting edge and can be exchanged in order to be able to use freshly sharpened cutting edges.

The knives b , which always work precisely horizontally, can be adjusted to different cutting depths in order to allow them to penetrate more or less deeply into the ground. This setting is carried out by means of the adjusting lever e and adjusting angle g, which are rotatably fastened on the axis i and which are connected to one another by the rods f . This is only shown in Fig. 1. An extreme position of the lever e is shown in dotted lines in Fig. 1, and the various possible positions of the wheels of the frame h in Fig. 1 are indicated in dotted lines; the middle position is fully extended.

The adjustment device ensures that the front and rear wheels move together Raise and lower simultaneously "and evenly in a vertical direction. This remains the cutting plane of the knife is always parallel to the ground.

You can also make the knife b in two parts and use interchangeable wedge inserts to produce different angles of attack for the knife; the cutting edge can also be adjusted for different angles by a small turn in the longitudinal axis of the knife.

On the back of the knife or on the upward-facing surface there are collecting rods d , which hold up the weeds like a sieve and let the earth fall through. The weeds deposited on rods d, d dries and can easily be removed. Depending on the type of weed, the rods d get corresponding distances that can be changed by removing or adding individual rods if you do not want to use different knives with narrow and wide rods d , in which the entire knife is replaced.

Claims (2)

Patent Claims: 1. Crust or weed cutter with adjustable height knives, characterized in that the knife (b) equipped with a common share point (σ) are provided with movable cutting edges in order to obtain different angles of attack for the cutting edge. 2. Execution according to claim 1, characterized in that the different Attack angle for the knife (δ) made by replaceable wedge inserts will. 1 sheet of drawings.