Systems and methods for chain joint cable routing
Cable routing approaches are described that allow cables to pass through a traditional chain joint without reducing the strength capacity or impairing the range of motion of the joint. The cable routing approaches permit the cables to be housed inside the structure of the robotic arm and pass through the chain joint in a manner that does not limit the width of the chain.
1. A mechanical joint mounted between an actuating arm and a moving arm, comprising:
a hub configured to receive one or more cables passing through the hub from the actuating arm to the moving arm, the hub including a body section including an outside surface, a flat top surface comprising one or more hub cable guide holes, a first and second side for attaching to the actuating arm and the moving arm, and a vertical slot extending through the body section configured to receive the one or more cables;
one or more linear actuators connected to a flexible mechanical drive system wherein the flexible mechanical drive system includes first and second flexible drive devices having first ends coupled to the one or more linear actuators and second ends configured to rotate the hub about its central axis resulting in a change of position between the actuating arm and the moving arm from a first position to a second position; and
a link connector extending from the flat top surface of the hub and attached on opposite sides to the second ends of the first and second flexible drive devices, the link connector including one or more connector cable guide holes aligned with the one or more hub cable guide holes and the one or more cables extend from the actuating arm through the one or more connector cable guide holes, the one or more hub cable guide holes, and through the vertical slot in between the second ends of the first and second flexible drive devices.
2. The mechanical joint of claim 1 , further comprising a processor configured to:
receive sensor data from a linear actuator sensor configured to determine the positions of the one or more linear actuators,
determine the first position of the moving arm with respect to the actuating arm,
generate a moving arm control signal to actuate the one or more linear actuators connected to the flexible mechanical drive system to rotate the hub to change the position between the actuating arm and the moving arm from the first position to the second position, and
receive sensor data from the linear actuator sensor to verify the moving arm is in the second position.
3. The mechanical joint of claim 2 , wherein the processor is located within the actuating arm.
4. The mechanical joint of claim 2 , wherein the one or more cables comprise at least one of power cable, hydraulic cable, pneumatic cable, or communications cable.
5. The mechanical joint of claim 2 , wherein the one or more linear actuators are at least one of hydraulic, electric over hydraulic, pneumatic, mechanical, electro-mechanical, piezoelectric, electric, and linear motor actuators.
6. The mechanical joint of claim 2 , wherein the linear actuator sensor is configured to identify a distance of movement of the moving arm and a position of the moving arm.
7. The mechanical joint of claim 2 , wherein the flexible mechanical drive system comprises at least one of cogs, links, chains, or belts.
8. The mechanical joint of claim 2 , including a wireless transmitter coupled to the processor configured to wirelessly transmit the sensor data to a controller outside of the actuating arm and the moving arm.
9. The mechanical joint of claim 2 , including a wireless transmitter coupled to the one or more linear actuators configured to wirelessly transmit the sensor data to the processor.
10. The mechanical joint of claim 1 , wherein the first and second flexible drive devices comprise two chains each coupled at the first ends to different ones of the one or more linear actuators and coupled at the second ends to the opposite sides of the link connector.
11. The mechanical joint of claim 10 , wherein widths of the second ends of the two chains extend substantially over an entire width of the outside surface of the hub.
12. The mechanical joint of claim 1 , wherein the vertical slot in the hub extends around an outside perimeter of the hub over 180 degrees to enable the moving arm to move in a 180 degree range perpendicular to a central axis of the actuating arm.
13. A mechanical joint mounted between an actuating arm and a moving arm, comprising:
a hub configured to receive one or more cables passing through the hub from the actuating arm to the moving arm, the hub including a body section including an outside surface, a flat top surface comprising one or more hub cable guide holes, a first and second side for attaching to the actuating arm and the moving arm, and a vertical slot extending through the body section configured to receive the one or more cables;
one or more actuators connected to a flexible mechanical drive system wherein the flexible mechanical drive system includes first and second flexible drive devices having first ends coupled to the one or more actuators and second ends configured to rotate the hub about its central axis resulting in a change of position between the actuating arm and the moving arm from a first position to a second position; and
a link connector extending from the flat top surface of the hub and attached on opposite sides to the second ends of the first and second flexible drive devices, the link connector including one or more connector cable guide holes aligned with the one or more hub cable guide holes and the one or more cables extend from the actuating arm through the one or more connector cable guide holes, the one or more hub cable guide holes, and through the vertical slot in between the second ends of the first and second flexible drive devices.
14. The mechanical joint of claim 13 , further comprising a processor configured to:
receive sensor data from an actuator sensor configured to determine the positions of the one or more actuators,
determine the first position of the moving arm with respect to the actuating arm,
generate a moving arm control signal to actuate the one or more actuators connected to the flexible mechanical drive system to rotate the hub to change the position between the actuating arm and the moving arm from the first position to the second position, and
receive sensor data from the actuator sensor to verify the moving arm is in the second position.
15. The mechanical joint of claim 14 , wherein the processor is located within the actuating arm.
16. The mechanical joint of claim 14 , wherein the actuator sensor is configured to identify a distance of movement of the moving arm and a position of the moving arm.
17. The mechanical joint of claim 14 , wherein the flexible mechanical drive system comprises at least one of cogs, links, chains, or belts.
18. The mechanical joint of claim 14 , including a wireless transmitter coupled to the one or more actuators configured to wirelessly transmit the sensor data to the processor.
19. The mechanical joint of claim 13 , wherein the first and second flexible drive devices comprise two chains each coupled at the first ends to different ones of the one or more actuators and coupled at the second ends to the opposite sides of the link connector.
20. The mechanical joint of claim 13 , wherein the vertical slot in the hub extends around an outside perimeter of the hub over 180 degrees to enable the moving arm to move in a 180 degree range perpendicular to a central axis of the actuating arm.