Actuator features to improve function of a mobile robot
An exoskeleton system that includes at least one actuator unit having an upper arm and a lower arm that are rotatably coupled via a joint and a fluidic actuator that extends between the upper arm and the lower arm.
1 . An exoskeleton system comprising:
a left and right leg actuator unit configured to be respectively coupled to a left and right leg of a user, the left and right leg actuator units each including:
an upper arm and a lower arm that are rotatably coupled via a joint, the joint positioned at a knee of the user with the upper arm coupled about an upper leg portion of the user above the knee and with the lower arm coupled about a lower leg portion of the user below the knee,
a fluidic bellows actuator that extends between the upper arm and lower arm, wherein the fluidic bellows actuator comprises a mechanical spur directly in the structure of the fluidic bellows actuator, the mechanical spur controlled by an external lever or button configured to cause the mechanical spur to cut, tear or open a hole in the fluidic bellows actuator to cause a release of fluid held within the fluidic bellows actuator and preventing the fluidic bellows actuator from holding pressurized fluid and removing resistance in movement of the actuator unit generated by the fluidic bellows actuator when holding pressurized fluid, and
and one or more stops disposed at one or both of the upper arm and the lower arm, the one or more stops configured to constrain rotation of the upper and lower arms including generating a maximum range of motion stop for the upper arm and the lower arm based on physical contact of the one or more stops, the maximum range of motion stop generated at less than an angle where main axes of upper arm and the lower arm are disposed along a coincident axis at 180°;
an exoskeleton device that includes:
a fluidic system, and
a processor and memory, the memory storing instructions, that when executed by the processor, are configured to control the fluidic system to introduce fluid to the fluidic bellows actuators of the left and right leg actuator units; and
a plurality of unitary cables, comprising a first unitary cable extending from the exoskeleton device to the right leg actuator unit and a second unitary cable extending from the exoskeleton device to the left leg actuator unit.
2 . The exoskeleton system of claim 1 , wherein the one or more stops disposed at one or both of the upper arm and the lower arm includes an adjustable stop configured to be rotatably adjusted to change the maximum range of motion stop via a screw that allows a position of a stop end of the adjustable stop to be changed, to change the maximum range of motion stop.
3 . The exoskeleton system of claim 1 , wherein the one or more stops disposed at one or both of the upper arm and the lower arm includes a first removable stop of a first size that is interchangeable with a second removable stop of a second size that is different than the first size, wherein the first size of the first removable stop generates the maximum range of motion stop at a first angle, and the second size of the second removable stop generates the maximum range of motion stop at a second angle that is different than the first angle.
4 . The exoskeleton system of claim 1 , wherein the one or more stops disposed at one or both of the upper arm and the lower arm include integral physical features of both the upper arm and the lower arm that come into physical contact to generate the maximum range of motion stop.
5 . The exoskeleton system of claim 1 , wherein the fluidic bellows actuator that extends between the upper arm and the lower arm is removable and replaceable with a replacement fluidic bellows actuator assembly that comprises a plurality of fluidic bellows actuators arranged in series with one another about the joint.
6 . The exoskeleton system of claim 1 , wherein the left and right leg actuator units further include a brake configured to generate resistance to a rotational movement of the upper arm and the lower arm about the joint, the brake comprising:
one or more of an electromechanical brake, an electro-magnetic brake, and a magnetic brake; and
a clutch that allows a selectable amount of braking force that ranges between zero and a max braking force as selected at least by execution, by the processor, of the instructions stored in the memory.
7 . The exoskeleton system of claim 1 , wherein the left and right leg actuator units further include:
a further portion of the exoskeleton device, and
a valve assembly that is operably coupled to the further portion of the exoskeleton device via a control line that allows the further portion of the exoskeleton device to control the valve assembly to open and close one or more valves of the valve assembly, the further portion of the exoskeleton device causing the one or more valves to remain open for a fixed amount of time after the exoskeleton system is shut down to allow fluid trapped in the fluidic bellows actuator to leave the fluidic bellows actuator so when the user uses the exoskeleton system again, they can start use without pressurized fluid present in the fluidic bellows actuator that would otherwise cause resistance in the fluidic bellows actuator.
8 . The exoskeleton system of claim 1 , wherein the left and right leg actuator units further include:
an interface that allows the user to calibrate motion of the leg actuation unit by the user manually indicating when the actuator unit is in a calibration configuration at one or more of: a predetermined zero location, resting on a hard-stop, at the maximum range of motion stop, or at a minimum range of motion hard stop.
9 . An exoskeleton system comprising:
at least one actuator unit that includes:
an upper arm and a lower arm that are rotatably coupled via a joint, and
a fluidic actuator that extends between the upper arm and the lower arm, wherein the fluidic actuator comprises a spur configured to cut, tear or open a hole in the fluidic actuator to cause a release of fluid held within the fluidic actuator and prevent the fluidic actuator from holding pressurized fluid.
10 . The exoskeleton system of claim 9 , further comprising one or more stops disposed at one or both of the upper arm and the lower arm, the one or more stops configured to constrain rotation of the upper and lower arms including generating a maximum range of motion stop for the upper arm and the lower arm based on physical contact of the one or more stops.
11 . The exoskeleton system of claim 10 , wherein the one or more stops disposed at one or both of the upper arm and the lower arm includes an adjustable stop configured to be adjusted to change the maximum range of motion stop via adjusting a position of a stop end of the adjustable stop change the maximum range of motion stop.
12 . The exoskeleton system of claim 10 , wherein the one or more stops disposed at one or both of the upper arm and the lower arm includes a first removable stop of a first size that is interchangeable with a second removable stop of a second size that is different than the first size, wherein the first size of the first removable stop generates the maximum range of motion stop at a first angle, and the second size of the second removable stop generates the maximum range of motion stop at a second angle that is different than the first angle.
13 . The exoskeleton system of claim 10 , wherein the one or more stops disposed at one or both of the upper arm and the lower arm include integral physical features of both the upper arm and the lower arm that come into physical contact to generate the maximum range of motion stop.
14 . The exoskeleton system of claim 9 , wherein the fluidic actuator that extends between the upper arm and the lower arm is removable and replaceable with a replacement fluidic actuator assembly.
15 . The exoskeleton system of claim 9 , wherein the at least one actuator unit further includes a brake configured to generate resistance to a rotational movement of the upper arm and the lower arm about the joint.
16 . The exoskeleton system of claim 9 , wherein the at least one actuator unit further includes:
an exoskeleton device, and
a valve assembly that is operably coupled to the exoskeleton device, the exoskeleton device configured to control the valve assembly to open and close one or more valves of the valve assembly, the exoskeleton device causing the one or more valves to remain open for a fixed amount of time after the exoskeleton system is shut down to release fluid in the fluidic actuator.
17 . The exoskeleton system of claim 9 , wherein the at least one actuator unit further includes:
an interface for calibrating motion of the at least one leg actuator unit by an indication of when the actuator unit is in a calibration configuration at one or more of: a predetermined zero location, resting on a hard-stop, at a maximum range of motion stop, or at a minimum range of motion hard stop.
18 . The exoskeleton system of claim 9 , further comprising:
an exoskeleton device that includes:
a fluidic system, and
a processor and memory, the memory storing instructions, that when executed by the processor, are configured to control the fluidic system to introduce fluid to the fluidic actuator of the at least one actuator unit; and
a first cable extending from the exoskeleton device to the at least one actuator unit.