Foundation support system shafts, assemblies and methods with asymmetric torque transmitting distal end edge teeth

A foundation support system comprising:

• a first hollow foundation support shaft sized and dimensioned to support a building foundation from a below ground location, the first hollow foundation shaft formed with a first longitudinal axis, a first axial length measured along the first longitudinal axis and a first torque transmitting distal end edge;
• wherein the first torque transmitting distal end edge includes a first asymmetric torque transmitting tooth and a second asymmetric torque transmitting tooth;
• and
• wherein each of the first asymmetric torque transmitting tooth and the second asymmetric torque transmitting tooth includes a forward torque transmitting edge portion extending parallel to the first longitudinal axis and a rearward force transmitting edge portion extending obliquely to the first longitudinal axis and adjacent to the forward torque transmitting edge portion;
• wherein the first torque transmitting distal end edge further includes a third asymmetric torque transmitting tooth;
• wherein the first, second and third asymmetric torque transmitting teeth includes an asymmetric torque transmitting tooth having a first size and an asymmetric torque transmitting teeth having a second size different from the first size.

A foundation support system comprising:

• a first hollow foundation support shaft sized and dimensioned to support a building foundation from a below ground location, the first hollow foundation shaft formed with a first longitudinal axis, a first axial length measured along the first longitudinal axis and a first torque transmitting distal end edge;
• a second hollow foundation support shaft sized and dimensioned to support the building foundation from a below ground location in combination with the first hollow support foundation shaft, the second hollow foundation shaft formed with a second longitudinal axis, a second axial length measured along the second longitudinal axis and a second torque transmitting distal end edge;
• and
• a sleeve for coupling the first hollow foundation support shaft and the second hollow foundation support shaft with respective first and second fasteners while the first and second torque transmitting distal ends are directly engaged to one another;
• wherein each of the first and second torque transmitting distal ends includes a plurality of asymmetric torque transmitting teeth each having a torque transmitting edge portion extending parallel to the first longitudinal axis or the second longitudinal axis and a torque transmitting edge portion that does not extend parallel to the first longitudinal axis or the second longitudinal axis;
• and
• wherein each of the plurality of asymmetric torque transmitting teeth are configured to respectively transmit a forward transmission of torque and a rearward transmission of torque between the directly engaged first and second torque transmitting distal ends;
• and
• wherein in one of the forward transmission of torque and the rearward transmission of torque the fasteners are mechanically isolated.

A foundation support system comprising:

• a first steel shaft dimensioned to support a building foundation from a below ground location, the first steel shaft formed with a first longitudinal axis, a first axial length measured along the first longitudinal axis and a first torque transmitting distal end edge;
• a second steel shaft sized and dimensioned to support the building foundation from a below ground location in combination with the first hollow support foundation shaft, the second steel shaft formed with a second longitudinal axis, a second axial length measured along the second longitudinal axis and a second torque transmitting distal end edge, wherein at least one of the first and second steel shaft includes a helical auger;
• and
• a sleeve for coupling the first hollow foundation support shaft and the second hollow foundation support shaft with respective first and second fasteners while the first and second torque transmitting distal ends are directly engaged to one another;
• wherein each of the first and second torque transmitting distal ends includes a plurality of asymmetric torque transmitting teeth each configured to be directly engaged to one another to transmit torque in a first direction along a first edge area and to transmit torque in a second direction along a second edge area, wherein the second edge area is greater than the first edge area.