Lawn mower driven by an internal-combustion motor

Abstract

Abstract 1. A lawnmower driven by an internal combustion engine the motor shaft of which is connected with the blade shaft (6a) which carries the blade beam (9) via a brake coupling which can be moved to the braking position by springs (10), with the brake coupling being capable of being coupled in against the force of the springs by a manually actuated positioning device, wherein the brake coupling comprises a coupling disc (3) carried by the motor shaft, a second coupling disc (4) frictionally cooperating with the first coupling disc and rotationally fixed and axially displaceable on the blade shaft (6a) carrying the blade beam (9), and a brake disc (6) which is secured beneath the second coupling disc (4) rotationally fixed and axially displaceable on the blade shaft (6a) and which cooperates with a brake disc (11) rotationally fixed to the housing, with the axial displacement of the second coupling disc (4) being brought about by an axially displaceable component (11) which is rotationally fixedly arranged relative to the housing, characterised by the following features : - The axially displaceable component which brings about the axial displacement of the second coupling disc (4) is a switching disc (11) which forms the brake disc rotationally fixedly connected to the housing, with the blade shaft (6a) passing vertically through the switching disc and the switching disc rotatably bracing the second coupling disc (4) with regard to vertical forces. - The switching disc (11) which is rotationally fixed to the housing is pressed by spring force (10) onto the brake disc (6) which is rotationally fixedly connected with the blade shaft (6a) and arranged beneath the switching disc. - The rotationally fixed connection of the switching disc (11) relative to the housing and the axial displaceability of the switching disc (11) relative to the blade shaft (6a) are brought about by the switching disc (11) being carried by pull rods (13) which extend axially parallel to the blade shaft (6a) and are axially displaceably guided through bores of a housing base plate (14) and, furthermore, by coil springs (10) drawn over the pull rods (13) with the coil springs being braced between the base plate (14) and the switching disc (11) and by the switching disc (11) being liftable via the pull rods (13) by a positioning device (20).

Inventors

• 👤 Walter Kolb
• 👤 Eberhard Schütz

Bibliographic Details