Line marking device and method for marking a line
A line marking device ( 1 ) comprising a cart ( 2 ) with at least one steerable wheel ( 3 ) and at least two moving elements ( 4, 5 ). The steerable wheel ( 3 ) is rotatable around its axle ( 13 ) and pivotable such that the cart ( 2 ) is steered in a desired direction. The line marking device ( 1 ) comprises a GNSS receiver ( 7 ) or a robotic total station mounted on the cart ( 2 ). The line marking device ( 1 ) also comprises at least one spray nozzle ( 8 ), for marking a line, which is mounted on the cart and directed towards the ground below the line marking device ( 1 ). The device ( 1 ) comprises an interface mounted on the cart for a comparator to compare a detected location by the GNSS receiver ( 7 ) to a predetermined pattern. The cart ( 2 ) may comprise a motor ( 14 ) which is adapted to pivot the steerable wheel ( 3 ) towards an intended movement.
1. A line marking device comprising:
a cart with at least one steerable wheel and at least two moving elements, wherein the steerable wheel is rotatable around its axle such that the cart is rollable over a surface and pivotable such that the cart is steered in a direction;
a GNSS receiver or a reflector for a robotic total station mounted on the cart; and
at least one marking unit for depositing a material to mark a line mounted on the cart,
wherein a nozzle is directed towards a ground below the line marking device; and
an interface mounted on the cart for a comparator adapted to compare a detected location by the GNSS receiver to a predetermined pattern; and
the cart comprises a steering unit for autonomously pivoting the at least one steerable wheel, wherein the device comprises only one steerable wheel.
2. The line marking device according to claim 1 , wherein the steering unit comprises a motor ( 14 ), preferably an electric motor, adapted to pivot the steerable wheel towards an intended direction of movement.
3. The line marking device according to claim 2 , wherein the steering unit comprises a clutch, and the clutch forms a separable operative connection between the motor and the steerable wheel.
4. The line marking device according to claim 3 , wherein the clutch is an overload clutch.
5. The line marking device according to claim 1 , wherein the device comprises a handle for manually pushing the line marking device.
6. The line marking device according to claim 1 , wherein the spray nozzle is mounted on an arm, the arm extends from the cart and the arm comprises a hinge for folding the arm to the cart.
7. The line marking device according to claim 1 , wherein the device comprises a paint tank, and the paint tank is arranged at least partially below the axle of the steerable wheel.
8. The line marking device according to claim 1 , wherein the steerable wheel in front of the at least two moving elements along an intended direction of movement.
9. The line marking device according to claim 1 , wherein the steering unit comprises a centering device for biasing the steerable wheel towards a center position.
10. The line marking device according to claim 9 , wherein the centering device comprises a disk with a V or U-shaped cut-out on a circumference, and a steering rod, and a biasing element biases the steering rod towards the center position.
11. The line marking device according to claim 10 , wherein the steering rod is connected to the frame.
12. The line marking device according to claim 1 , wherein the device comprises exactly two moving elements.
13. The line marking device according to claim 1 , wherein the device comprises a comparator, which is mounted to the cart and connected to the interface, the comparator is adapted to compare a detected location by the GNSS receiver to a predetermined pattern and the motor is controlled by the comparator.
14. The line marking device according to claim 13 , wherein the comparator is adapted to determine the direction of intended movement.
15. The line marking device according to claim 1 , wherein the marking unit is a spray nozzle.