Holder and concrete anchor assemblies

1. A concrete anchor assembly, comprising:

a) a housing having a top opening, said housing including outside thread;

b) said housing including a bottom wall with a bottom opening;

c) said bottom wall including a ramp surface extending upwardly and away from said bottom opening;

d) a split nut disposed on said bottom wall and over said bottom opening;

e) a spring biased to force said split nut toward a bottom of said ramp surface; and

f) a holder including a first sleeve portion having an inside threaded surface for threaded attachment to said outside thread of said housing.

2. A concrete anchor assembly as in claim 1 , wherein:

a) said housing includes an annular groove below said top opening; and

b) a spring clip is disposed in said groove to hold said spring within said housing.

3. A concrete anchor assembly as in claim 1 , and further comprising a washer disposed between said split nut and said spring.

4. A concrete anchor assembly as in claim 2 , and further comprising a washer disposed between said spring clip and said spring.

5. A concrete anchor assembly as in claim 1 , wherein said housing is cylindrical.

6. A concrete anchor assembly as in claim 1 , wherein:

a) said housing includes a cylindrical wall; and

b) circumferential flange portion disposed around said top opening extending transversely outwardly from said cylindrical wall.

7. A concrete anchor assembly as in claim 1 , wherein:

a) said housing includes an upper portion; and

b) said outside thread is disposed on said upper portion.

8. A concrete anchor assembly as in claim 1 , wherein:

a) said housing includes an inside upper portion;

b) thread disposed on said inside upper portion; and

c) a cap threadedly secured to said inside upper portion to cover said top opening.

9. A concrete anchor assembly as in claim 1 , wherein said split nut includes multiple diameter threads.

10. A concrete anchor assembly as in claim 1 , wherein:

a) said split nut includes a bottom edge; and

b) said bottom edge is beveled to mate with said ramp surface.

11. A concrete anchor assembly as in claim 6 , wherein:

a) said holder includes a base portion; and

b) nails extend from an underside of said flange portion through said base portion.

12. A concrete anchor assembly for being embedded in concrete, said assembly comprising:

a) a holder including a sleeve portion having an inside threaded surface;

b) an anchor body held by said holder, said anchor body including an outside threaded portion and a flange portion, said outside threaded portion in threaded engagement with said inside threaded surface;

c) said holder including a base portion;

d) nail shafts extending through said base portion;

e) said flange portion of said anchor body extending laterally from said outside threaded portion, said flange portion including an underside operably in contact with said nail shaft;

f) said holder including a plug portion coaxial with said sleeve portion, said plug portion being spaced from said sleeve portion; and

g) said plug portion extending from a bottom of said holder and having an opening coaxial with a bottom opening of said anchor body.

13. A concrete anchor assembly as in claim 12 , wherein:

a) said sleeve portion is attached to said base portion, said sleeve portion is vertically disposed above said base portion;

b) said sleeve portion includes a top edge;

c) said nail shafts include respective head portions;

d) said head portions of said nail shafts extend over and engage said top edge; and

e) said head portions of said nail shafts are in direct contact with said underside of said head portion of said anchor body.

14. A concrete anchor assembly as in claim 12 , wherein:

a) said nail shafts include respective head portions; and

b) said head portions of said nail shafts are in direct contact with said underside of said flange portion of said anchor body.

15. A concrete anchor assembly as in claim 1 , wherein said inside threaded surface includes a single turn thread.

16. A concrete anchor assembly as in claim 15 , wherein said single turn thread is segmented.

17. A concrete anchor assembly as in claim 12 , wherein said anchor body includes a rod portion having a threaded bore.

18. A concrete anchor assembly as in claim 17 , wherein said rod portion includes multiple diameter threaded bores.

19. A concrete anchor assembly as in claim 12 , wherein said anchor body includes a head portion with a threaded bore.

20. A concrete anchor assembly, comprising:

a) a housing including a lower opening, an upper opening and a side wall, said upper opening including a threaded cover, wherein said cover is threaded to said upper opening;

b) a flange portion extending from said housing;

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

d) a split nut disposed over said lower opening, said split nut including a bottom surface engaging said ramp surface;

e) said housing including a gap between said split nut and said side wall; and

f) a compressed spring to force said split nut toward a bottom of said ramp surface.

21. A concrete anchor assembly as in claim 20 , wherein said housing is cylindrical.

22. A concrete anchor assembly as in claim 20 , and further comprising a plug inside said lower opening.

23. A concrete anchor assembly as in claim 20 , wherein said split nut includes multiple diameter threads.