Principles, Standards and Implementation

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Protective Measures and Complementary Equipment

Introduction Preventing Access Detection Devices Safety Switches Guard Locking Switches
Non-Contact Interlock Switches Hinge Switches Position (Limit Switch) Interlocks Trapped Key Interlocks Operator Interface Devices
Logic Devices Integrated Safety Controllers Safety Networks Output Devices Connection Systems
Hinge Switches

The device is mounted over the hinge-pin of a hinged guard as shown in Figure 72. The opening of the guard is transmitted via a positive mode operating mechanism to the control circuit contacts.

Click to enlarge - Fig 4.52 Hinge Interlock
 
Figure 72: Hinge Switch Installation

When properly installed these types of switches are ideal for most hinged guard doors where there is access to the hinge center line. They can isolate the control circuit within 3° of guard movement and they are virtually impossible to defeat without dismantling the guard.

Care must be taken since an opening movement of only 3° can still result in a significant gap at the opening edge on very wide guard doors. It is also important to ensure that a heavy guard does not put excessive stress on the switch actuator shaft.