Heavy capacity arm support systems

1. A system for supporting an arm of a user while using tool, comprising:

a harness configured to be worn on a body of a user, the harness comprising a shoulder harness configured to be worn over or around one or both shoulders of the user including a first pivot point above the shoulder of a user when the harness is worn by the user;

an arm support comprising a first arm support segment pivotally coupled to the first pivot point, a second arm support segment pivotally coupled to the first arm support segment for supporting an upper arm of the user, and a third arm support segment pivotally coupled to the second arm support segment for supporting a lower arm of the user;

a linkage coupled between the first arm support segment and the third arm support segment such that a vertical angle of the third arm support segment is not affected by rotation of the second arm segment;

a tool mount coupled to the third arm support segment; and

a first set of compensation elements coupled to the second arm support segment for at least partially offsetting a gravitational force acting on the upper arm, and a second set of compensation elements coupled to the third arm support segment for at least partially offsetting a gravitational force acting on the lower arm.

2. The system of claim 1 , wherein the first set of compensation elements are mounted at least partially on the second arm support segment.

3. The system of claim 2 , wherein the second set of compensation elements are mounted at least partially on the third arm support segment.

4. The system of claim 1 , wherein the first and second sets of compensation elements are mounted on the harness, and wherein a plurality of cables couple the first and second sets of compensation elements to the second and third arm support segments, respectively.

5. The system of claim 1 , wherein the first arm support segment is configured to rotate about a first vertical axis to follow horizontal rotation of the user's arm.

6. The system of claim 5 , wherein the second arm support segment is configured to rotate about a second horizontal axis to follow vertical rotation of the user's upper arm.

7. The system of claim 6 , wherein the third arm support segment is configured to rotate about a third axis to follow rotation of the user's lower arm relative to the user's upper arm.

8. The system of claim 1 , wherein a second end of the first arm support segment is pivotally coupled to a first end of the second arm support segment at a first horizontal pivot point, and a second end of the second arm support segment is disposed adjacent a first end of the third arm support segment, wherein the linkage comprises a first link pivotally coupled to the second end of the second arm support segment and a second link pivotally coupled between the second end of the first arm support segment and the first link such that the second link extends substantially parallel to the second arm support segment and the first link remains substantially vertical when the second arm support segment is rotated, and wherein a first end of the third arm support segment is pivotally coupled to the first link.

9. The system of claim 8 , wherein the first and second sets of compensation elements comprise first and second spring-pulley-cable assemblies, respectively, wherein an offset force of the first spring-pulley-cable assembly is variable based on a rotation angle of the second arm support segment independent of a rotation angle of the third arm support segment, and wherein an offset force of the second spring-pulley-cable assembly is variable based on the rotation angle of the third arm support segment independent of the rotation angle of the second arm support segment.

10. The system of claim 8 , wherein the linkage further comprises an elbow bracket pivotally coupled to the first link about a vertical pivot point, and wherein the first end of the third arm support segment is pivotally coupled to the elbow bracket about a horizontal pivot point, wherein the vertical pivot point accommodates bending of the forearm of the user within a substantially horizontal plane.

11. The system of claim 10 , wherein the elbow bracket nests at least partially in the first link when the second and third arm support segments are substantially straight.

12. A system for supporting an arm of a user while using a tool, comprising:

a harness configured to be worn on a body of a user, the harness comprising a shoulder harness configured to be worn over or around one or both shoulders of the user including a first pivot point above the shoulder of a user when the harness is worn by the user;

an arm support comprising a first arm support segment pivotally coupled to the first pivot point, a second arm support segment pivotally coupled to the first arm support segment for supporting an upper arm of the user, and a third arm support segment pivotally coupled to the second arm support segment for supporting a lower arm of the user;

a tool mount coupled to the third arm support segment; and

a first set of compensation elements coupled to the second arm support segment for at least partially offsetting a gravitational force acting on the upper arm, and a second set of compensation elements coupled to the third arm support segment for at least partially offsetting a gravitational force acting on the lower arm,

wherein the tool mount comprises a pivot frame pivotally coupled to the third arm support segment.

13. The system of claim 12 , wherein the tool mount further comprises a gimbal device pivotally coupled to the pivot frame to provide multiple degrees of freedom for a tool secured to the tool mount.

14. The system of claim 13 , wherein the tool mount further comprises a socket coupled to the gimbal device for receiving a portion of the tool.

15. A system for supporting an arm of a user while using a tool, comprising:

a harness configured to be worn on a body of a user;

an arm support pivotally coupled to the harness for supporting a user's arm;

a tool mount on a free end of the arm support for receiving a tool such that the tool is manipulatable by a hand of the user's arm supported by the arm support; and

one or more compensation elements coupled to the arm support for at least partially offsetting a gravitational force acting on the user's arm and the tool received on the tool mount.

16. The system of claim 15 , wherein the arm support comprises a first arm support segment for supporting an upper arm of the user, and a second arm support segment for supporting a lower arm of the user, the tool mount coupled to the second arm support segment.

17. The system of claim 16 , wherein the one or more compensation elements comprise a first set of compensation elements coupled to the first arm support segment for at least partially offsetting a gravitational force acting on the user's upper arm.

18. The system of claim 17 , wherein the one or more compensation elements further comprise a second set of compensation elements coupled to the second arm support segment for at least partially offsetting a gravitational force acting on the user's lower arm and the tool receiving on the tool mount.

19. A system for supporting an arm of a user while using a tool, comprising:

a harness configured to be worn on a body of a user, the harness comprising a shoulder harness configured to be worn over or around one or both shoulders of the user including a first pivot point above the shoulder of a user when the harness is worn by the user;

an arm support comprising a first arm support segment pivotally coupled to the first pivot point, a second arm support segment pivotally coupled to the first arm support segment for supporting an upper arm of the user, and a third arm support segment pivotally coupled to the second arm support segment for supporting a lower arm of the user;

a linkage coupled between the first arm support segment and the third arm support segment such that a vertical angle of the third arm support segment is not affected by rotation of the second arm support segment; and

a first set of compensation elements coupled to the second arm support segment for at least partially offsetting a gravitational force acting on the upper arm, and a second set of compensation elements coupled to the third arm support segment for at least partially offsetting a gravitational force acting on the lower arm.

20. The system of claim 19 , further comprising an arm rest on the second arm support segment for supporting the user's upper arm.

21. The system of claim 19 , further comprising an arm rest on the third arm support segment for supporting the user's lower arm.