Patent ID: 9624952
Date: 2017-04-18
CPC Classifications: E04B,F16B,Y10T

Claim:
1. An insertion frame structure comprising: a pair of primary members whose cross-sectional shapes possess an L shaped portion, each of the primary members comprising a bottom surface side and an inner surface side extending from the bottom surface side to form the L-shaped portion, and the pair of primary members being separated by a predetermined distance such that the inner surface sides of the each of the primary members face each other symmetrically with respect to a center line passing the midpoint of the predetermined distance; and a plurality of auxiliary members whose cross-sectional shapes are groove-shaped so that each of the auxiliary members comprises a bottom portion, a first side portion extending from the bottom portion, and a second side portion extending from the bottom portion to form the groove-shape with an open top portion, and each of the auxiliary members being placed between the primary members, wherein the primary members and the auxiliary members are joined with each other at latch portions, the latch portions of the primary members each have a latch hole, the latch portions of the auxiliary members each have a convex portion to be inserted into the latch hole, and each of the latch holes has a first clearance area and a second clearance area extending continuously from the first clearance area, the first clearance area being larger than a plate thickness of each of the auxiliary members, and the second clearance area being equal to or smaller than the plate thickness of each of the auxiliary members.