| 摘要 |
A safety lock device of an instrument switch is provided to prevent a safety lock bar from being damaged by a pressure applied to a switch knob by repositioning the switch knob to be switched off so that the contact point of a switch main body is switched off. A spring fixing pin(120) and a safety lock bar holder(110) are protrudedly formed on a lower part of an instrument switch knob(100). A safety knob(200) pressurizes a spring(500) of which a part is connected to the spring fixing pin(120) of the switch knob(100). The safety knob(200) is movably installed along the other direction by a self-elastic force of the spring(500). A rectangular saw-toothed wheel(600) is fixedly connected to a lower part of the safety knob(200). A circular shape saw-toothed wheel(320) is geared with the rectangular saw-toothed wheel(600). A safety lock bar(300) rotates along the same direction with the rotation direction of the circular saw-toothed wheel(600) about the safety lock bar holder(110). A fixed protrusion(410) enables the safety lock bar(300) to maintain a rotation state. The fixed protrusion(410) enables the switch knob(100) to maintain an on/off state.
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