| 摘要 |
A floor maintenance machine has a base, an electric motor on the base for moving a floor treating element and a handle connected to the base. Carried by the handle are an electric switch for connecting electric power to the motor, a pair of manually movable hand levers for controlling actuation of the switch, and a safety latch and an interlock mechanism for preventing and enabling movement of the hand levers to actuate the switch. The safety latch normally blocks movement of the hand levers from off to on positions to actuate the switch, but may be manually moved to a release position out of blocking relationship with the hand levers. When the safety latch is in its release position, movement of the hand levers from their off to their on positions is then controlled by the interlock mechanism, which enables both hand levers to be simultaneously moved from their off to their on positions to actuate the switch and energize the motor, but prevents only one hand lever from being moved from its off to its on position while the other hand lever is in its off position. Once both hand levers have been simultaneously moved to their on positions, only one hand lever then needs to be held in its on position to continue to energize the motor. By virtue of the interlock mechanism, both hands of an operator must be on the machine to start it.
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