DE1062474B - Motor mower - Google Patents

Description

The invention relates to a motor mower with a cutting unit at the front, carried by a boom, its mowing knife via a two-armed swivel mounted on the boom, in the direction of travel extending rocker arm is driven by a rotating disk in which the rear rocker arm end is mounted eccentrically.

Proceeding from this, the invention is based on the object of avoiding the crank loop backlash that in a known mower blade drive in a fork of the rocker arm up and down sliding drive pin the rotating disc needs. The solution to this problem is characterized by that the rear arm of the one-piece rocker arm that is rigid in the direction of the knife movement is compliant and resilient in the vertical direction. The drive pin of the arm can thus in be stored in a bearing eye of the disc, which, owing to the lack of slots for stones, branches, or the like. is not accessible, so that annular seals, capsules and lids to close the sliding bearing gap can be provided. The subject matter of the invention thus works more reliably and quietly as slider crank engines.

In a further embodiment of the invention, the front arm of the rocker arm is also perpendicular Direction flexible and resilient, so that this arm also takes part in the elastic force transmission and contributes to noise reduction and to keeping harmful stresses small. The rocker arm can be a leaf spring extending from the mower blade to the drive pulley.

Appropriately, the bearing of the rocker arm detects this in its center, but is behind the Center mounted on the boom of the motor mower, so that the rear arm can be reached of the bending lever is as long as possible. It is also provided that the bearing of the Rocker arm with the interposition of rubber cushions on a bolt arranged in the boom is pivotably mounted and that the leaf spring and the bearing are arranged only by one on the bearing Terminal are connected to each other. This has the advantage that the rocker arm of the Washer initiated rotary movements of the rear drive pin largely shock-absorbing transfers the front, only to and fro swinging drive pin.

Exemplary embodiments are shown in the drawing.

Fig. 1 shows a boom with rocker arm in a perspective view,

Fig. 2 a spring leaf with driving pin and
Fig. 3 the individual parts of the bearing for a spring leaf; Motor mower

Applicant:

Walter Gutbrod,
Plochingen, Hindenburgstr. 94

Karl Fröhlich, Stuttgart-Zuffenhausen,
has been named as the inventor

Fig. 4 shows a longitudinal section of a rocker arm mounting in a schematic representation.

The screw-on plate 1 a of the boom 1 is used to screw the boom to the engine block of the motor mower, while the part 1 b carries the finger bar. The bearing 2 is clamped onto the boom with the aid of a bolt 3 and a nut 4. Rubber cushions 5 and 6 in the form of conical rings dampen shocks that are transmitted from the rotating disc 8 a via the rear drive pin 7 b, via the spring leaf 7 and the front drive pin 7 a to the mower knife; they also dampen vibrations that act back from the mower blade on the rocker arm. Since the mowing knife, not shown, with the driving pin 7 α can only execute movements in the direction of the arrows .4, while the disc 8 a forces the driving pin 7 b circular movements in the direction of the arrow B , the spring leaf 7 is rotated once with each revolution of the disc shaft 8 the amount of the disc eccentric stroke in the direction of the arrows £ (cf.

Fig. 4) bent back and forth and pivoted back and forth through the angle a around the axis D. The longer the spring leaf, the lower the stress on the spring material. For this reason, it is expedient if the spring leaf 7 extends from its front driver pin 7 a , which acts on the mower blade, to its rear driver pin 7 b , which acts on the disk 8 a of the engine.

The spring leaf holder 2 a of the bearing 2 can be designed as a clamp, the jaws 2 b of which grasp the spring leaf 7. The jaws 2 6 are pulled together by the screw 9, the head of which is sunk into the spring leaf holder 2 α, so that the spring leaf cannot slip. The driving pin 7 a and

909 579/37

Claims (6)

b are connected to the spring leaf 7 by a butt welding process (Fig. 1) or by a riveting process. . Claims-: . . 1. A motor mower with a cutting unit located in front, carried by a boom, the mower blade of which is driven by a rotating disc in which the rear rocker arm end is eccentrically mounted via a two-armed rocker arm which is pivotably mounted on the boom and which extends in the direction of travel that the rear arm of the one-piece rocker arm (7), which is rigid in the direction of the knife movement, is flexible and resilient in the vertical direction. 2. Motor mower according to claim 1, characterized in that the front arm of the rocker arm (7) is resilient and resilient in the vertical direction. ao 3. Motor mower according to claim 2, characterized in that the rocker arm (7) consists of a leaf spring extending from the mower blade to the drive pulley (8 a). 4. Motor mower according to claim 2 or 3, characterized in that the bearing (2) of the rocker arm detects this in its center, but is pivotably mounted behind the center on the boom (1) of the motor mower. 5. Motor mower according to claim 4, characterized in that the bearing (2) of the rocker arm (7 ) is pivotably mounted with the interposition of rubber cushions (5, 6) on a bolt (3) arranged in the boom (1). 6. Motor mower according to claim 4 or 5, characterized in that the leaf spring (7) and the bearing (2 ) are connected to one another only by a clamp (2 a, 2 b, 9) arranged on the bearing (2). Considered publications:
German Patent Nos. 385 800, 941 524;
German patent application ρ 23307 III / 45 c D (published on February 28, 1952). 1 sheet of drawings © 909 579/37 7.