Pull up system and bar locking fastener therefor

A pull up system comprising:

• a bar member having a first end and a second end opposite the first end, the bar member having an outer surface;
• and
• a support assembly attachable to an outside surface, the support assembly including:
• a first arm member and a second arm member each comprising a tube member having a peripheral wall defining an elongated cavity, the first and second arm members spaced apart from each other, and each having a proximal end and a distal end opposite the proximal end with the distal end spaced apart from the outside surface and having a length defined between the proximal and distal ends, wherein the first arm member comprises:
• a first transverse opening and a second transverse opening extending through the wall and into the cavity of the first arm member, wherein the first transverse opening is spaced from the second transverse opening along the length of the first arm member, each of the first and second transverse openings structurally configured to receive the bar member slidably therethrough;
• a first locking opening and a second locking opening extending through the wall and into the cavity of the first arm member, the first locking opening being aligned with and proximate to the first transverse opening, and the second locking opening being aligned with and proximate to the second transverse opening, such that the first locking opening is spaced from the second locking opening along the length of the first arm member;
• a first bar locking fastener and a second bar locking fastener each comprising a flange nut with an upper portion and a lower flange, the upper portion of the first bar locking fastener being received in the first locking opening and having a first perimeter which shape matingly engages the first locking opening so as to preclude substantial rotation therebetween, with the lower flange of the first bar locking fastener positioned within the cavity of the first arm member and engaging an inner surface of the wall of the first arm member adjacent to the first locking opening, such that passage of the lower flange through the first locking opening is precluded, and the upper portion of the second bar locking fastener being received in the second locking opening and having a second perimeter which shape matingly engages the second locking opening so as to preclude substantial rotation therebetween, with the lower flange of the second bar locking fastener positioned within the cavity of the first arm member and engaging the inner surface of the wall of the first arm member adjacent to the second locking opening, such that passage of the lower flange through the second locking opening is precluded, and
• wherein the second arm member comprises:
• a third transverse opening and a fourth transverse opening extending through the wall and into the cavity of the second arm member, wherein the third transverse opening is spaced from the fourth transverse opening along the length of the second arm member, each of the third and fourth transverse openings structurally configured to receive the bar member slidably therethrough;
• a third locking opening and a fourth locking opening extending through the wall and into the cavity of the second arm member, the third locking opening being aligned with and proximate to the third transverse opening, and the fourth locking opening being aligned with and proximate to the fourth transverse opening, such that the third locking opening is spaced from the fourth locking opening along the length of the second arm member;
• a third bar locking fastener and a fourth bar locking fastener each comprising a flange nut with an upper portion and a lower flange, the upper portion of the third bar locking fastener being received in the third locking opening and having a third perimeter which shape matingly engages the third locking opening so as to preclude substantial rotation therebetween, with the lower flange of the third bar locking fastener positioned within the cavity of the second arm member and engaging an inner surface of the wall of the second arm member adjacent to the third locking opening, such that passage of the lower flange through the third locking opening is precluded, and the upper portion of the fourth bar locking fastener being received in the fourth locking opening and having a fourth perimeter which shape matingly engages the fourth locking opening so as to preclude substantial rotation therebetween, with the lower flange of the fourth bar locking fastener positioned within the cavity of the second arm member and engaging the inner surface of the wall of the second arm member adjacent to the fourth locking opening, such that passage of the lower flange through the fourth locking opening is precluded;
• and
• a plurality of bolts each being threadedly engageable with the flange nuts and each configured to be axially advanced through the respective flange nut to advance a lower end surface thereof into the cavity of the first arm member or the second arm member,
• wherein the bar member is configured to be positioned in at least a first position, where the bar member is received in the first transverse opening of the first arm member and the third transverse opening of the second arm member and extends into the cavities of the first and second arm members, and where two of the plurality of bolts are engaged with the flange nuts of the first bar locking fastener and the third bar locking fastener and engage the bar member within the cavities of the first and second arm members to clamp the bar member within the first transverse opening and the third transverse opening, and a second position spaced from the first position along the lengths of the first and second arm members, where the bar member is received in the second transverse opening of the first arm member and the fourth transverse opening of the second arm member and extends into the cavities of the first and second arm members, and where two of the plurality of bolts are engaged with the flange nuts of the second bar locking fastener and the fourth bar locking fastener and engage the bar member within the cavities of the first and second arm members to clamp the bar member within the second transverse opening and the fourth transverse opening.