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An improved transition coupling for a helical soil pile assembly transfers a compression load between two coupled shaft segments with little or no compression loading on the bolts that fasten the parts together. The coupling body has a shaft-receiving socket that extends axially into the body from o

An improved transition coupling for a helical soil pile assembly transfers a compression load between two coupled shaft segments with little or no compression loading on the bolts that fasten the parts together. The coupling body has a shaft-receiving socket that extends axially into the body from one end to a socket bottom that axially abuts the end of one of the shafts. The body also has at least one shoulder between its ends that extends laterally outward and faces toward the end remote from the socket. A cylindrical portion of the body, which fits closely within the hollow end of the other shaft, extends axially toward the socket end up to the shoulder, which is adapted to abut the end of that shaft. At least one pair of aligned transverse holes in the body is adapted to receive a fastener.

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1. A pile coupling for connecting a hollow end portion of a rotatable cylindrical first pile shaft to an end portion of a second pile shaft, the pile coupling comprising: a metallic body formed as one piece having a first end, a second end opposite said first end, and a longitudinal axis extending b

1. A pile coupling for connecting a hollow end portion of a rotatable cylindrical first pile shaft to an end portion of a second pile shaft, the pile coupling comprising: a metallic body formed as one piece having a first end, a second end opposite said first end, and a longitudinal axis extending between said first end and said second end, said body comprising a socket having a side wall adapted to closely receive the end portion of the second pile shaft, said socket extending axially into said body from said second end to a socket bottom which faces toward said second end and confronts the second pile shaft, when assembled;a shoulder between said first end and said second end extending laterally outward from said body and facing toward said first end;a cylindrical portion adapted to fit closely within the hollow end portion of the first pile shaft, said cylindrical portion extending axially from said first end toward said second end, beyond said socket bottom and up to said shoulder, which confronts the first pile shaft when assembled; anda first pair of aligned transverse fastener holes in said cylindrical portion between said shoulder and said socket bottom and extending through said side wall of said socket. 2. The pile coupling of claim 1, wherein said body is inwardly tapered near and toward said second end. 3. The pile coupling of claim 2, wherein said body is inwardly tapered from said shoulder toward said second end. 4. The pile coupling of claim 1, further comprising a second pair of aligned transverse fastener holes in said cylindrical portion. 5. The pile coupling of claim 1, wherein said shoulder comprises a substantially continuous annular shoulder. 6. The pile coupling of claim 1, wherein said socket is substantially square. 7. The pile coupling of claim 1, wherein said socket is cylindrical. 8. A helical soil pile assembly, comprising: a rotatable cylindrical first pile shaft having a hollow end portion with a first pair of aligned transverse holes extending therethrough;a second pile shaft having an end portion with a transverse hole therethrough and having, or operatively connected to a pile shaft having at least one laterally extending helical plate embedded in soil; anda coupling connecting said hollow end portion of said first pile shaft to said end portion of said second pile shaft, said coupling comprising a metallic body formed as one piece having a first end, a second end opposite said first end and a longitudinal axis extending between said first end and said second end, said body comprising a socket having a side wall closely receiving said end portion of said second pile shaft, said socket extending axially into said body from said second end to a socket bottom which faces toward said second end and confronts said end portion of said second pile shaft;a shoulder between said first end and said second end extending laterally outward from said body and facing toward said first end;a cylindrical portion fitting closely within said hollow end of said first pile shaft, said cylindrical portion extending axially from said first end toward said second end, beyond said socket bottom and up to said shoulder, which confronts said hollow end of said first pile shaft; anda first pair of aligned transverse holes in said cylindrical portion between said shoulder and said socket bottom extending through said side wall of said socket in alignment with said transverse hole in said second pile shaft and aligned with said first pair of holes in said first pile shaft, anda first fastener in all of said aligned holes securing said first pile shaft, said second pile shaft and said coupling together. 9. The helical soil pile assembly of claim 8, further comprising a second pair of aligned transverse holes in said first pile shaft, a second pair of aligned transverse holes in said cylindrical portion of said body aligned with said second pair of transverse holes in said first pile shaft, and a second fastener extending through said aligned second pairs of transverse holes. 10. The helical soil pile assembly of claim 8, wherein said shoulder comprises a substantially continuous annular shoulder. 11. The helical soil pile assembly of claim 8, wherein said socket is substantially square, and said second pile shaft has a substantially square cross-section. 12. The helical soil pile assembly of claim 8, wherein said socket is cylindrical, and said second pile shaft has a round cross-section. 13. A pile coupling for connecting a hollow end portion of a rotatable cylindrical first pile shaft to an end portion of a second pile shaft, the pile coupling comprising: a metallic body formed as one piece having a first end, a second end opposite said first end, and a longitudinal axis extending between said first end and said second end, said body comprising a socket having a side wall adapted to closely receive the end portion of the second pile shaft, said socket extending axially into said body from said second end to a socket bottom which faces toward said second end and confronts the second pile shaft, when assembled;at least one shoulder between said first end and said second end extending laterally outward from said body and facing toward said first end;a cylindrical portion adapted to fit closely within the hollow end portion of the first pile shaft, said cylindrical portion extending axially from said first end toward said second end and up to said at least one shoulder, which confronts the first pile shaft when assembled;a nose portion between said at least one shoulder and said second end, said nose portion tapering inwardly toward said second end and having a pair of diametrically opposed flats;a first pair of aligned transverse fastener holes in said nose portion extending through said flats and said side wall of said socket; andat least one pair of aligned transverse fastener holes in said cylindrical portion. 14. The pile coupling of claim 13, wherein said nose portion and said flats extend to said at least one shoulder, and said at least one shoulder comprises two shoulders separated by said flats. 15. The pile coupling of claim 14, further comprising at least one additional pair of aligned transverse fastener holes in said cylindrical portion. 16. The pile coupling of claim 13, further comprising at least one additional pair of aligned transverse fastener holes in said cylindrical portion. 17. The pile coupling of claim 13, wherein said flats extend beyond said nose portion toward said first end, further comprising a second pair of aligned transverse fastener holes extending through said flats and said side wall of said socket. 18. The pile coupling of claim 17, further comprising at least one additional pair of aligned transverse fastener holes in said cylindrical portion. 19. The pile coupling of claim 13, wherein said at least one shoulder comprises two shoulders separated by said flats. 20. The pile coupling of claim 19, wherein said flats are substantially parallel to said longitudinal axis. 21. The pile coupling of claim 13, wherein said socket is substantially square. 22. The pile coupling of claim 13, wherein said socket is cylindrical. 23. A helical soil pile assembly, comprising: a rotatable cylindrical first pile shaft having a hollow end portion with a first pair of aligned transverse holes extending therethrough;a second pile shaft having an end portion with at least one transverse hole therethrough and having, or operatively connected to a pile shaft having at least one laterally extending helical plate embedded in soil;a coupling connecting said hollow end portion of said first pile shaft to said end portion of said second pile shaft, said coupling comprising a metallic body formed as one piece having a first end, a second end opposite said first end and a longitudinal axis extending between said first end and said second end, said body comprising a socket having a side wall closely receiving said end portion of said second pile shaft, said socket extending axially into said body from said second end to a socket bottom which faces toward said second end and confronts said end portion of said second pile shaft,at least one shoulder between said first end and said second end extending laterally outward from said body and facing toward said first end,a cylindrical portion fitting closely within said hollow end of said first pile shaft, said cylindrical portion extending axially from said first end toward said second end and up to said at least one shoulder, which confronts said hollow end portion of said first pile shaft,a nose portion between said at least one shoulder and said second end, said nose portion tapering inwardly toward said second end and having a pair of diametrically opposed flats,a first pair of aligned transverse fastener holes in said nose portion extending through said flats and said side wall of said socket and aligned with said at least one transverse hole in said second pile shaft, andat least one pair of aligned transverse fastener holes in said cylindrical portion aligned with said first pair of transverse holes in said first pile shaft,a first fastener in said first pair of aligned transverse fastener holes of said nose portion and in said at least one transverse hole of said second pile shaft securing said coupling and second pile shaft together; anda second fastener in said at least one pair of aligned transverse fastener holes in said cylindrical portion and in said first pair of aligned transverse holes of said first pile shaft securing said coupling and said first pile shaft together. 24. The helical soil pile assembly of claim 23, wherein said nose portion and said flats extend to said at least one shoulder, and said at least one shoulder comprises two shoulders separated by said flats. 25. The helical soil pile assembly of claim 24, further comprising a second pair of aligned transverse fastener holes in said cylindrical portion of said coupling, a second pair of aligned transverse fastener holes in said first pile shaft, and a third fastener in said second pairs of aligned transverse fastener holes securing said coupling and said first pile shaft together. 26. The helical soil pile assembly of claim 23, wherein said flats extend beyond said nose portion toward said first end, further comprising a second pair of aligned transverse fastener holes extending through said flats and said side wall of said socket, at least one additional transverse hole in said second pile shaft, and an additional fastener in said second pair of transverse fastener holes in said flats and in said at least one additional transverse hole in said second pile shaft securing said coupling and said second pile shaft together. 27. The helical soil pile assembly of claim 26, further comprising a second pair of aligned transverse fastener holes in said cylindrical portion of said coupling, a second pair of aligned transverse fastener holes in said first pile shaft, and a third fastener in said second pairs of aligned transverse fastener holes securing said coupling and said first pile shaft together. 28. The helical soil pile assembly of claim 23, wherein said socket is substantially square, and said second pile shaft has a substantially square cross-section. 29. The helical soil pile assembly of claim 23, wherein said socket is cylindrical, and said second pile shaft has a round cross-section.