Earth drilling reamer with replaceable blades

1. An earth drilling reamer, comprising:

an elongated body having an outer surface;

a plurality of blade mounting supports extending radially outwardly from the outer surface of the body, each blade mounting support having a primary blade engagement positioned parallel to the outer surface;

a removable primary blade detachably secured to the primary blade engagement; and

a leading blade engagement angled from the outer surface of the body to the primary blade engagement; and

a leading blade detachably secured to the leading blade engagement.

2. The earth drilling reamer of claim 1 , wherein the leading blade engagement is comprised of a track that terminates at the primary blade engagement, the leading blade has an engagement that engages the track and the engagement of the primary blade with the primary blade engagement prevents the leading blade from being removed from the track.

3. The earth drilling reamer of claim 1 , wherein the primary blade engagement is comprised of a female receptacle and the primary blade has a male member which is received in the female receptacle, with a locking assembly being provided to prevent the male member from being withdrawn from the female receptacle.

4. An earth drilling reamer comprising:

an elongated body having an outer surface;

a plurality of blade mounting supports extending radially outwardly from the outer surface of the body, each blade mounting support having a primary blade engagement positioned parallel to the outer surface and a leading blade angled from the outer surface to the primary blade engagement;

a removable primary blade detachably secured to the primary blade engagement, the primary blade engagement comprising a female receptacle and the primary blade having a male member which is received in the female receptacle; and

a locking assembly that prevents the male member from being withdrawn from the female receptacle.

5. The earth drilling reamer of claim 4 , wherein a leading blade engagement is angled from the outer surface of the body to the primary blade engagement and the leading blade is detachably secured to the leading blade engagement.

6. The earth drilling reamer of claim 4 , wherein a leading blade engagement is comprised of a track that terminates at the primary blade engagement, the leading blade has an engagement that engages the track and the engagement of the primary blade with the primary blade engagement prevents the leading blade from being removed from the track.