Adjustable hanger bar for luminaires

A hanger bar assembly comprising:

• a first hanger bar member comprising:
• a first rail segment;
• a first channel segment including a first channel;
• a first transitional middle segment extending between the first rail segment and the first channel segment, wherein the first rail segment and the first channel segment are offset from each other with respect to a horizontal axis;
• and
• a first stoppage tab extending out from an edge of the first channel segment;
• and
• a second hanger bar member comprising:
• a second rail segment, wherein the second rail segment is designed to be positioned in the first channel of the first channel segment;
• a second channel segment including a second channel, wherein the first rail segment is designed to be positioned in the second channel;
• a second transitional middle segment extending between the second rail segment and the second channel segment, wherein the second rail segment and the second channel segment are offset from each other with respect to the horizontal axis;
• and
• a second stoppage tab extending out from the second channel segment toward the edge of the first channel segment, wherein, after the first hanger bar member and the second hanger bar member are interlocked with each other, the first stoppage tab and the second stoppage tab are designed to abut against each other to prevent unintended disengagement of the first hanger bar member from the second hanger bar member.

A luminaire mounting structure for mounting a recessed luminaire, the luminaire mounting structure comprising:

• a first hanger bar assembly;
• a second hanger bar assembly;
• and
• a plaster frame, wherein the first hanger bar assembly is attached to the plaster frame on a first side of the plaster frame, wherein the second hanger bar assembly is attached to the plaster frame on a second side of the plaster frame opposite the first side, wherein each of the first hanger bar assembly and the second hanger bar assembly comprises a first hanger bar member and a second hanger bar member, wherein the first hanger bar member comprises:
• a first rail segment;
• a first channel segment including a first channel;
• a first transitional middle segment extending between the first rail segment and the first channel segment, wherein the first rail segment and the first channel segment are offset from each other with respect to a horizontal axis;
• and
• a first stoppage tab extending out from an edge of the first channel segment;
• and
• wherein the second hanger bar member comprises:
• a second rail segment, wherein the second rail segment is positioned in the first channel of the first channel segment;
• a second channel segment including a second channel, wherein the first rail segment is positioned in the second channel;
• a second transitional middle segment extending between the second rail segment and the second channel segment, wherein the second rail segment and the second channel segment are offset from each other with respect to the horizontal axis;
• and
• a second stoppage tab extending out from the second channel segment toward the edge of the first channel segment, wherein the first stoppage tab and the second stoppage tab are designed to abut against each other to prevent unintended disengagement of the first hanger bar member from the second hanger bar member.