| 摘要 |
PURPOSE:To enlarge a working range and as well to increase the load capacity by attaching an upper arm which is driven another drive source, rotatably to one side part of a base while preventing interference with a quardangle linkage. CONSTITUTION:With the tilting of a quardangle linkage L, an upper base 10 is translated. Further, an upper arm 11 is rotated by one side part of a the base 10. As a result, it can be moved not only in the forward direction but also both upward and rearward directions without being subjected to a limited actuating angle due to interference between drive link members for driving the upper arm 11. Further, even through a heavy weight is applied to a list part, a moment applied to the upper arm is prevented from being transmitted an angular moment for rotating lower arms 6, 7, and accordingly, it only acts as a gravitational load upon the front ends of the lower arms 6, 7. Thereby it is possible to remarkably reduce the moment applied upon the lower arm 6, 7. |
