US 5,855,068 AGranted

Apparatus for cutting of plants

AssigneeRobert Bosch GmbH

InventorsGuenter Zilly, Wilhelm Hepperle, Beate Eger, Albert Ruess, Klaus-Peter Schnelle, Jan P. Houben, Bob Jung

Life of this patent

Estimating the term…

Loading patent…

Abstract

For a device for cutting plants with a cutting line (36, 38) which rotates around an axis of rotation and is wound on a reel (13), wherein a slide (16) releasably locks the reel (13) by means of a cam (26) with respect to elements which rotatingly take it along, wherein the length of the free end (37, 39) of the cutting line (36, 38) can be adjusted by unlocking the reel (13), wherein the slide (16) is displaced out of its locked position into its unlocked position by means of centrifugal force in the course of the shortening of the cutting line (36, 38), the cutting line adjustment is simplified and functionally improved in that the slide (16) is maintained in its locked position only by means of the force equilibrium of the mass support forces between its cam (26) and a detent (28) on the reel side, out of which it is displaceable by centrifugal force into its unlocked position, so that the reel (13) can rotate in respect to the cup (12), wherein the cam (26) is returned into the locked position by the mass support force on a guide surface (62) on the reel side and wherein the detent surface (250) of the detent (280) has an increasingly flattened contour with increasing distance from the reel center (12, 112).

Claims14

Dependent claims

A device for cutting plants with at least one cutting line (36, 38) which rotates around an axis of rotation (12;

112) and extends radially away from it, which is wound on a reel (13;
113) which is disposed in a rotatingly driven cup (10) and has at least one opening on its circumference, through which a free end (37, 39) of the cutting line (36, 38) extends to the outside, wherein a slide (16,116), which is secured against relative rotation and is guided radially displaceably with respect to the axis of rotation (12;
112), locks the reel (13;
113) secure against relative rotation or unlocks it with respect to the cup (10) by means of a cam (26;
126), so that the length of the free end (37, 39) of the cutting line (36, 38) can be adjusted by rotating the reel (13;
113) with respect to the cup (10), wherein the slide (16;
116) is displaced out of its locked position into its unlocked position by means of centrifugal force in the course of the shortening of the free end (37, 39) of the cutting line (36, 38), characterized in that a detent (28;128) is provided and arranged so that by means of the force equilibrium of the mass support forces between its cam (26;
126) and the detent (28;
128) on a reel side the slide (16;
116) is maintained in its locked position, out of which it is displaced by centrifugal force into its unlocked position and is, during the relative rotation of the reel (13;
113) with respect to the cup (10), released, and returned into the locked position by the mass support force between its cam (26;
126) and a guide surface (62;
162) of a guide body (130) formed on the reel (13;
113).

11 more elements

Dependencies are inferred from the claim text.