| 主权项 |
1. A load-supporting apparatus including:
a four-bar linkage including:
a first lever including first and second ends;a second lever including first and second ends, wherein the first end of the second lever is connected to the second end of the first lever;a third lever including first and second ends, wherein the first end of the third lever is connected to the second end of the second lever; anda fourth lever including first and second ends, wherein the first end of the fourth lever is connected to the second end of the third lever, wherein the second end of the fourth lever is connected to the first end of the first lever; a pushing element including first and second ends, wherein the first end of the pushing element is connected to a portion of the first lever between the first and second ends; a hanging element including an end connected to the second end of the pushing element; an extending device including first and second end, wherein the first end of the extending device is connected to the end of the hanging element, wherein the second end of the extending device is placed against a portion of the second lever between the first and second ends; a first rivet for connecting the first lever to the second lever; a second rivet for connecting the second lever to the third lever; a third rivet for connecting the third lever to the fourth lever; a fourth rivet for connecting the fourth lever to the first lever; a fifth rivet for connecting the pushing element to the first lever; a sixth pin for connecting the pushing element, the hanging element and the extending device to one another; and a seventh rivet for connecting the hanging element to the second lever. |
