Two-Hand Control Devices
The two-hand control requires constant, concurrent pressure by the operator to activate the machine as shown in figure 1 below.
Two-Hand Control Device
The control device requires a part-revolution clutch, brake, and a brake monitor if used on a power press.
With this type of device, the operator's hands are required to be at a safe location (on control buttons) and at a safe distance from the danger area while the machine completes its closing cycle.
| Safeguarding Action | Advantages | Limitations |
|
Concurrent use of both hands is required, preventing the operator from entering the danger area |
Operator's hands are at a pre-determined location Operator's hands are free to pick up a new part after first half of the cycle is completed |
Requires a partial cycle machine with a brake Some two-hand controls can be rendered unsafe by holding with arm or blocking, thereby permitting one-hand operation Protects only the operator |
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3-5. Which safeguard device requires constant, concurrent pressure by the operator to activate the machine?
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