PROBLEM TO BE SOLVED: To make the fitting and removing works easier by setting four rigid frame sides constituting a fixed frame on recessed channels by a right angle L-shaped corner fastening tool, fixing by screws and fixing a canvas removably on a canvas fixing frame provided with screw-holes and the like bored at the given intervals by using auxiliary fixing tools. ;SOLUTION: Both ends of four rigid frame sides 1a-1d are fitted on recessed channels 8 on the backs of frame sides by using a right angle L-shaped corner fastening tool 3, and fastened by screws 4 to retain the right angle and form a rectangle hard to be deformed. A recessed section 9 is formed on the surface outer periphery on the side of setting the canvas, while a columnar protruded section 5 is formed on the back outer periphery of the fixed frame and a serrated channel 6 is formed on its neck. The canvas is wrapped into the columnar protruded section 5, and while the canvas is stretched along the circumference of a column by auxiliary fixing tools, the canvas is inserted into the serrated channel 6 by the auxiliary fixing tools and fixed by a fixing clip. The canvas setting or removing work can be carried out simply even by a non-professional person, an old man, a woman or a girl.;COPYRIGHT: (C)1998,JPO
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