Portable screen assembly and expanding and contracting column and handing tool used therefor

A portable screen assembly comprising:

• a casing having an opening extending in a longitudinal direction;
• a spring-biased roll rotatably mounted to the casing;
• a screen wound around the spring-biased roll when in storage and pulled out from the opening when in use;
• a top bar secured to one end of the screen and used also as a cover to close the opening when in storage;
• and
• an expandable column having one end supported at the casing and holding the pulled out screen in a stretched state, wherein
• the column is an expanding and contracting column having at least a first cylindrical body, a second cylindrical body, and a third cylindrical body, wherein the first cylindrical body slides within the second cylindrical body, the second cylindrical body slides within the third cylindrical body, and the cylindrical bodies are located in an order of the first cylindrical body, the second cylindrical body and the third cylindrical body from an upper stage side in an extended state, and
• the expanding and contracting column comprises:
• a first lock portion locking slide of the first cylindrical body;
• a second lock portion locking slide of the second cylindrical body;
• a lock release lever provided at an upper end portion of the first cylindrical body;
• a release bar having an upper end portion pivotally supported to the lock release lever so as to be movable vertically within the first cylindrical body;
• a first lock release portion provided at a lower end portion of the release bar and releasing the first lock portion;
• and
• a second lock release portion provided further below the first lock release portion at the lower end portion of the release bar and releasing the second lock portion.