| 摘要 |
PURPOSE:To prevent entirely play tone from being generated, by causing a telephone receiver to press downward gradually the hollow expansion and contraction part to position the telephone receiver in the prescribed position when the telephone receiver is put on the hollow expansion and contraction part provided correspondingly to the prescribed position of the telephone receiver. CONSTITUTION:Telephone receiver 20 is positioned on support face 6 and support arms 7, and compresses expansion and contraction part 3 by its weight to make switch pieces 22 off-state. When telephone receiver 20 which functions as the switching cover of air suction hole 4 is put off, expansion and contraction part 3 expands to suck from air suction hole 4 into air room 9, and switch pieces 22, 22 are turned on. When telephone receiver 20 is returned to support face 6 after use, air suction hole 4 is closed, and air in air room 9 is exhausted gradually from small-diameter air exhaustion hole 5 by the weight of telephone receiver 20, and expansion and contraction part 3 contracts gradually, and switch pieces 22, 22 sink very softly to break the service state. |
