Abstract: A mobile soil working device, comprising a machine frame, a drive for at least one piercing tool, a guiding element, moveably guided on the machine frame, for at least one piercing tool, a tool holder for the piercing tool, which holder is mounted around a first pivot axis in the guiding element is provided. It is provided that the overall center of gravity of the tool holder and the at least one piercing tool is arranged in relation to the first pivot axis in such a way that the moment of inertia of the tool holder and the piercing tool that counteracts the restoring moment is at least partially reduced or compensated or overcompensated in such a way that the moment of inertia acting around the first pivot axis forms at least part of the restoring moment.

Abstract: A device for sowing seed, fertilizer in an existing lawn, comprising: a chassis, a movement system, fitted to the chassis, to move the device across the ground in a certain direction, a bearing-mounted pin disk in the chassis around a horizontal axis, a seed dosing device which doses the seed to be sown accurately and according to an adjustable amount, a guiding plate which at the bottom pushes the existing grass forward in the direction of the movement and at the top distributes the dosed seed in rows and sends the seed to the pin disk, wherein the pin disk collects the dosed seed from the guiding plate and plants the seed in the soil underneath the lawn during rotation.

Abstract: A mobile soil working device, comprising a machine frame, a drive for at least one piercing tool, a guiding element, moveably guided on the machine frame, for at least one piercing tool, a tool holder for the piercing tool, which holder is mounted around a first pivot axis in the guiding element is provided. It is provided that the overall center of gravity of the tool holder and the at least one piercing tool is arranged in relation to the first pivot axis in such a way that the moment of inertia of the tool holder and the piercing tool that counteracts the restoring moment is at least partially reduced or compensated or overcompensated in such a way that the moment of inertia acting around the first pivot axis forms at least part of the restoring moment.

Abstract: The invention pertains to a device for sowing new grass seed, fertilizer or other products in an existing lawn. The device comprises a chassis (1) which includes a drive shaft (15) in the horizontal plane fitted with cams, around which bearing-mounted pin disk (12) combinations have been fitted. The device is also fitted with a seed dosing system, consisting of a seed tray (3) and a driven dosing roll (5), the dose of which can be changed. The dosed seed (4) falls onto a guiding plate (10) along its full width, where the seed (4) is distributed in rows by means of funnel plates (11) and is introduced to the pin disks (12). The pin disks collect the seed and plant it in the existing lawn. In order to improve results on hard soil, a vibrating action in the vertical plane can be added to the pin disks (12) by driving the central drive shaft (15). This vibrating movement pushes the seed into the soil, presses it against the side of the hole and improves penetration of the pins in hard soil.

Abstract: The invention relates to a device for maintaining grass fields, provided with a frame (1) movable along a ground surface, supporting on one or more support wheels (2), a gearbox with power take-offs (5), a steering handle (11), a drive motor (10), and with exchangeable working attachments which can be fixedly connected to the device and another support wheel (7) on one side adjacently of this working attachment which can be connected fixedly, pivotally or for active steering to the frame with a supporting arm (8) which is adjustable in position and lockable.

Abstract: The invention relates to a device for maintaining grass fields, provided with a frame (1) movable along a ground surface, supporting on one or more support wheels (2), a gearbox with power take-offs (5), a steering handle (11), a drive motor (10), and with exchangeable working attachments which can be fixedly connected to the device and another support wheel (7) on one side adjacently of this working attachment which can be connected fixedly, pivotally or for active steering to the frame with a supporting arm (8) which is adjustable in position and lockable.

Abstract: The invention relates to an apparatus for aerating a ground layer including a frame movable along a ground surface and a number of substantially vertically placed aerating pins movable in and out of the ground layer. Each pin is engaged by a pivot arm mounted on the frame for pivoting, and a guide arm is connected to the frame at a distance from the position where the pivot arm engages the frame. A drive element is provided for causing reciprocal pivoting of the pivot arm during the movement of the apparatus along the ground layer. The connections of the pivot arm to the frame and the aerating pin and the connections of the guide arm to the frame and the aerating pin substantially form corners of a parallelogram in the non-loaded state of the aerating pin. At least one of the sides of this parallelogram is changeable in length such that the bottom part of the pin is displaced relative to the top part of the pin in a direction opposed to the direction of movement of the frame.

Abstract: The invention relates to a soil treating device comprising at least one working element rotatably driven by a rotation shaft and a frame accommodating the working element and displaceable practically parallel to the ground, characterized in that the rotatable working element consists of a plurality of contact elements intended for ground working and fixed in a holder, wherein at least a part of the contact elements lies at different distances from the rotation shaft.

Abstract: A device for making sowing furrows in a lawn, provided with a mobile frame having a number of disc-like cutting members disposed adjacently of each other transversely of the direction of forward movement thereof and drivable round a horizontal shaft. According to the invention the cutting edge of each disc-like knife has a continually varying distance to the shaft of the knife, this such that the difference between the largest and smallest distance to the shaft of the knife lies in the order of magnitude of the cutting depth and the knife has one or more outward protruding lobes.

Abstract: The invention relates to a soil working device, comprising a substantially cylindrical soil working member, which is mounted between two main supporting arms for rotation about a substantially horizontal axis and is axially composed of a number of sections which are mutually connected and connected with two shaft end sections journalled in said main supporting arms respectively through couplings of the universal type, the coupling between each two sections being supported by an auxiliary supporting arm which extends into the travelling direction and pivotally engages a connecting bar extending between said main supporting arms parallel to and in front of said soil working member.

Abstract: Starting from a mark (G) provided on a wall of the room, plugs are cut from a plastic rod (11), which is adjustable within a tube (1) of the tool, which is supported through legs (3; 23) by the underground . The cutting takes place at the location of a quantity of adhesive provided on the ground, so that the plug adheres to the ground. The upper surfaces of the plugs then indicate the correct height of the floor of flowing mortar to be provided. The correct plug height is obtained at each location when a laser receiver (9; 35) connected to the tube is coincident with a stationary positioned laser beam (20).