Working machine

A working machine in the form of a dumper vehicle, comprising:

• a frame;
• a ground engaging propulsion system connected to the frame for propelling the dumper vehicle;
• a drive arrangement for providing motive power to the ground engaging propulsion system;
• an operator platform pivotally connected to the frame and moveable between a deployed position for supporting an operator thereon and a stowed position;
• and
• a sensor arrangement configured to sense when an external force is applied to the operator platform when said operator platform is in the deployed position,
• wherein the dumper vehicle is configured to prevent movement of the ground engaging propulsion system when the sensor arrangement does not sense an external force applied to the operator platform when said operator platform is in the deployed position,
• wherein the dumper vehicle comprises an open topped container mounted to the frame for carrying a load therein, wherein the container is moveable between a transport position for transporting a load and a discharge position for discharging a load;
• and
• wherein the sensor arrangement comprises a biasing element configured to urge the operator platform away from the deployed position, and a limit switch arranged to engage a cam surface associated with the operator platform, such that the limit switch is configured to determine when an external force is applied to the operator platform and the biasing element has been overcome;
• wherein the limit switch and the cam surface are arranged such that the limit switch is in a first position when the operator platform is in the stowed position and when the operator platform is in the deployed position and the biasing element has been overcome, and wherein when the limit switch is in the first position, movement of the ground engaging structure is enabled;
• and
• wherein the limit switch and the cam surface are arranged such that the limit switch is in a second position when the operator platform is intermediate the stowed position and the deployed position, and wherein when the limit switch is in the second position, movement of the ground engaging structure is prevented.

A working machine in the form of a loader, comprising:

• a frame;
• a loading shovel mounted to the frame;
• a ground engaging propulsion system connected to the frame for propelling the loader;
• a drive arrangement for providing motive power to the ground engaging propulsion system;
• an operator platform pivotally connected to the frame and moveable between a deployed position for supporting an operator thereon and a stowed position;
• and
• a sensor arrangement configured to sense when an external force is applied to the operator platform when said operator platform is in the deployed position;
• wherein the loader is configured to prevent movement of the ground engaging propulsion system when the sensor arrangement does not sense an external force applied to the operator platform when said operator platform is in the deployed position;
• wherein the sensor arrangement including a biasing element configured to urge the operator platform away from the deployed position, and a limit switch arranged to engage a cam surface associated with the operator platform, such that the limit switch is configured to determine when an external force is applied to the operator platform and the biasing element has been overcome;
• wherein the limit switch and the cam surface are arranged such that the limit switch is in a first position when the operator platform is in the stowed position and when the operator platform is in the deployed position and the biasing element has been overcome, and wherein when the limit switch is in the first position, movement of the ground engaging structure is enabled;
• and
• wherein the limit switch and the cam surface are arranged such that the limit switch is in a second position when the operator platform is intermediate the stowed position and the deployed position, and wherein when the limit switch is in the second position, movement of the ground engaging structure is prevented.