Holder and concrete anchor assemblies

1. A concrete anchor assembly, comprising:

a) a housing including an opening and a side wall, the side wall including an upper end portion; b) a flange portion extending outwardly from the upper end portion of the side wall;

c) a ramp surface extending upwardly around the lower opening;

d) a split body disposed over the opening, the split body including a surface engaging the ramp surface, the split body including a threaded opening;

e) the housing including a gap between the split body and the side wall; and

f) a spring to force the split body toward a bottom of the ramp surface.

2. A concrete anchor assembly as in claim 1 , wherein the housing is cylindrical.

3. A concrete anchor assembly as in claim 1 , and further comprising a plug inside the opening.

4. A concrete anchor assembly as in claim 1 , wherein the threaded opening has multiple diameters.

5. A concrete anchor assembly as in claim 1 , wherein the split body is a split nut.

6. A concrete anchor assembly as in claim 1 , wherein the housing includes an upper opening covered with a tape.

7. A concrete anchor assembly as in claim 1 , wherein the housing includes an upper opening with a threaded cover.

8. A concrete anchor assembly as in claim 1 , and further comprising:

a) a first washer disposed on the split body inside the housing; and

b) the spring is disposed above the first washer.

9. A concrete anchor assembly as in claim 8 , and further comprising:

a) a second washer operably attached to an upper portion of the housing; and

b) the spring is disposed between the first washer and the second washer.

10. A concrete anchor assembly as in claim 9 , and further comprising:

a) a spring clip operably attached to the side wall inside housing;

b) the spring clip is disposed above the second washer to hold the second washer against the spring.

11. A concrete anchor assembly as in claim 10 , wherein:

a) the side wall includes a circumferential groove in the side wall inside the housing; and

b) the spring clip is disposed inside the circumferential groove.

12. A concrete anchor assembly as in claim 1 , wherein the flange portion is circumferential around the housing.

13. A concrete anchor assembly as in claim 3 , wherein:

a) the plug includes a base portion; and

b) the housing is disposed on the base portion.

14. A concrete anchor assembly as in claim 13 , and further comprising a nail extending through the base portion.

15. A concrete anchor as in claim 1 , and further comprising a holder for the housing.

16. A concrete anchor assembly as in claim 15 , wherein:

a) the housing includes outside threads; and

b) the holder includes an opening with inside threads mated to the outside threads.

17. A concrete anchor assembly, comprising:

a) a plug having a plug portion and a base portion attached to the plug portion, the base portion for attachment to a form board prior to pouring of concrete;

b) a hollow anchor body operably attached to the plug portion, the hollow anchor body including an opening and a side wall, the hollow anchor body including a ramp surface extending upwardly around the opening, the hollow anchor body including a flange portion extending from an upper end portion of the side wall;

c) a split body disposed over the opening, the split body including a surface engaging the ramp surface, the split body including a threaded opening;

d) the hollow anchor body including a gap between the split body and the side wall; and

e) a spring to force the split body toward a bottom of the ramp surface.

18. A concrete anchor assembly as in claim 17 , wherein:

a) the base includes a peripheral edge; and

b) openings disposed along the peripheral edge to receive screws or nails for attaching the base to the form board.

19. A concrete anchor assembly as in claim 17 , wherein the split body includes multiple threaded bores of differing diameters.

20. A concrete anchor assembly as in claim 17 , wherein the split body is a split nut.