Concrete anchor

1. An anchor for supporting a load, comprising:

a) an anchor rod having a lower threaded portion for being embedded in a concrete structure and an upper portion for attachment to a load;

b) a metallic tubular body operably attached to said lower threaded portion;

c) said tubular body including a sidewall, a top opening and a bottom opening, said sidewall including inside and outside surfaces;

d) at least one shoulder extending outwardly from said outside surface;

e) a shoulder extending inwardly from said inside surface; and

f) said lower threaded portion is disposed within said tubular body, said lower threaded portion is spaced apart from any portion of said tubular body.

2. An anchor as in claim 1 , wherein said outside surface above said at least one shoulder is conical.

3. An anchor as in claim 1 , wherein:

a) said outside surface is a recessed profile defined by a downwardly and inwardly projecting surface and an outwardly projecting surface defining said at least one shoulder; and

b) said inwardly and downwardly projecting surface terminates into said outwardly projecting surface on said outside surface.

4. An anchor as in claim 1 , wherein said inside surface is a recessed profile defined by a downwardly and inwardly projecting surface and an inwardly projecting surface defining said shoulder of said inside surface.

5. An anchor as in claim 4 , wherein said shoulder of said inside surface is disposed above said inwardly and downwardly projecting surface on said inside surface.

6. An anchor as in claim 1 , and further comprising:

a) upper and lower spacers disposed on said top and bottom openings, respectively; and

b) said upper and lower spacers including a respective central opening through which said lower threaded portion extends.

7. An anchor as in claim 6 , wherein:

a) said top and bottom openings include respective peripheries; and

b) said upper and lower spacers include projecting members that engage respective said peripheries.

8. An anchor as in claim 7 , wherein:

a) said upper and lower spacers each includes an outer ring and an inner ring; and

b) radiating arms joined to said outer ring and said inner ring.

9. An anchor as in claim 8 , and further comprising a support attached to said tubular body.

10. An anchor as in claim 9 , wherein:

a) said support is formed from sheet metal bent into an inverted U-shape having a base wall and side walls extending downwardly from said base wall; and

b) said tubular body is attached to said base wall.

11. An anchor as in claim 10 , wherein said base wall includes openings communicating with the interior of said tubular body.

12. An anchor as in claim 1 , wherein:

a) said tubular body is a cylindrical sleeve;

b) said outside surface includes at least one circumferential groove;

c) a split ring partly disposed in said at least one circumferential groove such that a portion of said ring extends outside said groove beyond said outside surface; and

d) said portion of said ring comprises said at least one shoulder.

13. An anchor as in claim 1 , wherein:

a) said inside surface includes a circumferential groove;

b) a split ring partly disposed in said groove such that a portion of said ring extends outside said groove beyond said inside surface; and

c) said portion of said ring comprises said shoulder of said inside surface.

14. An anchor for supporting a load, comprising:

a) an anchor rod having a lower threaded portion for being embedded in a concrete structure and an upper portion for attachment to a load;

b) a metallic tubular body operably attached to said lower threaded portion;

c) said tubular body including a sidewall, a top opening and a bottom opening, said sidewall including inside and outside surfaces;

d) at least one shoulder extending outwardly from said outside surface;

e) a shoulder extending inwardly from said inside surface; and

f) said lower threaded portion extending through said openings past said tubular body.

15. An anchor for supporting a load, comprising:

a) an anchor rod having a lower threaded portion for being embedded in a concrete structure and an upper portion for attachment to a load;

b) a metallic tubular body operably attached to said lower threaded portion;

c) said tubular body including a sidewall, a top opening and a bottom opening, said sidewall including inside and outside surfaces;

d) at least one shoulder extending outwardly from said outside surface;

e) a shoulder extending inwardly from said inside surface;

f) upper and lower spacers disposed on said top and bottom openings, respectively; and

g) said upper and lower spacers including a respective central opening through which said lower threaded portion extends.