ANGLE OF DEPRESSION AND ANGLE OF ELEVATION ADJUSTING MECHANISM

摘要

PURPOSE:To change no angle of depression and angle of elevation even when a load is applied downward from the upper face of a cabinet by providing a lock device capable or incapable of shifting from an arbitrary holding step to a next holding step by a holder according to the downward pressing operation of the cabinet. CONSTITUTION:The lock device 6 is provided with a plate form base body 35 made of metal disposed substantially in parallel to the step part 2a' of the bottom face of the cabinet and a lock lever 38 made of metal of an L shape substantially and having one side provided with a lock pin 37 selectively engaged and inserted to one of the plural engaging holes 5a, 5b, 5c of a back leg 5 and the other side of the lock lever 38 is disposed in the notch 40 of a rotation regulating piece 39 formed by bending a part of the base of the base body 35 and erecting. When the lock pin 37 is inserted into the engaging hole 5b, even if a back cover 2 is pressed downward, the back leg 5 is not inserted into the back cover 2, consequently, the angle of depression and the angle of elevation are fixed.