Plate nut assembly

1. A plate nut assembly comprising:

a nut in a shape of a plate having long sides and short sides, and including, at a central portion of the nut, a threaded hole extending through the nut in a thickness direction of the nut; and

a tab located on one surface of the nut, the tab including:

a bifurcated portion disposed at a central portion of the tab, and having distal ends on two sides of the bifurcated portion; and

a fixed portion integrally connected to the distal ends of the bifurcated portion,

and fixed to portions of the nut on two opposite sides of the threaded hole in a transverse width direction of the nut,

wherein the plate nut assembly is configured such that, by (i) inserting the nut through a nut insertion hole formed in a hollow member, the nut insertion hole having a diameter smaller than a length of the nut and larger than a transverse width of the nut;

and (ii) bending the tab, the nut can be located inside of an inner surface of the hollow member with the threaded hole opposed to the nut insertion hole,

wherein a transverse width of the bifurcated portion of the tab is larger than the transverse width of the nut,

wherein the plate nut assembly is configured such that, when the nut is inserted through the nut insertion hole of the hollow member until the nut is located inside of the inner surface of the hollow member, two side edges of the bifurcated portion in a transverse width direction of the bifurcated portion come into contact with an inner periphery of the nut insertion hole,

wherein the bifurcated portion includes protruding portions including the two side edges of the bifurcated portion, each of the protruding portions protruding outwardly beyond a respective side edge of the nut by a protruding amount α, the protruding amount α being equal to half a difference between the transverse width of the bifurcated portion and the transverse width of the nut,

wherein the plate nut assembly is configured such that, with the tab attached to the nut insertion hole, the respective side edge of the nut intersects with the inner periphery of the nut insertion hole at a predetermined point where the tab is fixed to the nut.

2. The plate nut assembly according to claim 1 ,

wherein the protruding amount a satisfies a relation 1.5α<β, where β is a distance, in plan view seen from a thickness direction of the hollow member, between the predetermined point and a corresponding one of two positions of the tab at which the tab is folded.

3. The plate nut assembly according to claim 2 , wherein the protruding amount α satisfies a relation 2α≤Γ, where Γ is a linear distance, in plan view seen from a thickness direction of the hollow member, between the predetermined point and a position at which a corresponding one of the two side edges of the bifurcated portion comes into contact with the inner periphery of the nut insertion hole.

4. The plate nut assembly according to claim 1 ,

wherein the protruding amount α satisfies a relation 2α<Γ, where Γ is a linear distance, in plan view seen from a thickness direction of the hollow member, between the predetermined point and a position at which a corresponding one of the two side edges of the bifurcated portion comes into contact with the inner periphery of the nut insertion hole.