Hoist pickup bar

1. A device, comprising:

a plate having first and second ends, and a top surface, and a bottom surface, said bottom surface having a first curved portion located at said first end, and having a second curved portion located at said second end, where first and second curved portions are concave portions on said bottom surface;

said plate having a connection part;

a clamp portion, coupled to said connection part, having a first movable part with a first movable curved portion located to face to said first curved portion, which is movable both toward and away from said bottom plate and also toward and away from said first end and said first curved portion on said plate, including being movable in a first direction that causes said first movable curved portion to move vertically relative to said first curved portion, a movable in a second direction that causes said first movable curved portion to move horizontally relative to said first curved portion, and said clamp portion having a second movable part with a second movable curved portion located to face to said second curved portion, which is movable both toward and away from said bottom plate and also toward and away from said second end first end and said second curved portion on said plate, including being movable in said first direction that causes said second movable curved portion to move vertically relative to said second curved portion, a movable in said second direction that causes said second movable curved portion to move horizontally relative to said second curved portion, closer to one another, and to move towards and away from said first curved portion in a second direction that causes said first curved portion and said clamp first curved portion to be horizontally closer to one another, and the second clamp portion,

where in an unclamped position, said first and second moveable parts are in a location that is inwardly spaced from said first and second curved portions in a way such that said first and second curved portions can be lowered on to respective trusses, and where in a clamped position, said first and second movable parts clamp and hold bottom surfaces of said respective trusses.

2. The device as in claim 1 , wherein said first and second clamp portions, slide along a slot defined relative to said plate to move in said second direction.

3. The device as in claim 1 , wherein said first and second curved portions and said first and second movable curved portions are sized to hold against a support bar of a truss.

4. The device as in claim 1 , wherein said clamp portions are moved in said first direction by loosening and tightening a bolt that is connected between said plate and said clamp portions.

5. The device as in claim 1 , further comprising a second plate, where said plate, herein being called a first plate, and said first plate and said second plate collectively form a plate assembly, with a space defined between said first and second plates.

6. The device as in claim 1 , further comprising a load holding portion on said plate.

7. The device as in claim 1 , wherein said load holding portion holds a chain hoist.

8. The device as in claim 1 , wherein said curved portions each define less than 120° of an arc of a circle.

9. The device as in claim 1 , wherein the plate is sized to connect to two different supports of a truss without extending beyond the horizontal extent of the truss.

10. A truss and device, comprising:

a truss having first and second supports;

a plate having first and second ends, and a top surface, and a bottom surface, said bottom surface having a first curved portion located at said first end, and having a second curved portion located at said second end, where first and second curved portions are concave portions on said bottom surface that are spaced to press against said first and second supports of said truss;

a clamp portion, coupled to said plate, having a first movable part with a first movable curved portion located to face to said first curved portion, which is movable in two orthogonal directions relative to said first curved portion on said plate, including being movable in a first direction that causes said first movable curved portion to move vertically relative to said first curved portion, a movable in a second direction that causes said first movable curved portion to move horizontally relative to said first curved portion, and said clamp portion having a second movable part with a second movable curved portion located to face to said second curved portion, which is movable in said two orthogonal directions relative to said second curved portion on said plate, including being movable in said first direction that causes said second movable curved portion to move vertically relative to said second curved portion, a movable in said second direction that causes said second movable curved portion to move horizontally relative to said second curved portion, closer to one another, and to move towards and away from said first curved portion in a second direction that causes said first curved portion and said clamp first curved portion to be horizontally closer to one another, and the second clamp portion,

where both said first movable part and said second movable part of said clamp portion, when moved to innermost horizontal positions, do not interfere with said plate being lowered onto said truss portion, and where in a clamped position, said first and second movable parts clamp and hold bottom surfaces of said respective trusses.

11. The device as in claim 10 , wherein said first and second clamp portions slide along a slot defined relative to said plate to move in said second direction.

12. The device as in claim 10 , wherein said clamp portions are moved in said first direction by loosening and tightening a bolt that is connected between said plate and said clamp portions.

13. The device as in claim 10 , further comprising a second plate, where said plate, herein being called a first plate, and said first plate and said second plate collectively form a plate assembly, with a space defined between said first and second plates.

14. The device as in claim 10 , further comprising a load holding portion on said plate, and a load on said load holding portion.

15. The device as in claim 14 , wherein said load is held completely within an outer extent defined by outer supports of said truss.

16. The device as in claim 10 , wherein said load is a chain hoist.

17. The device as in claim 10 , wherein said curved portions each define less than 120° of an arc of a circle.