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Mechanical Door Locks for Access Control

Once power to a machine has been isolated and the ‘Isolation Key’ has been exchanged for the ‘Access Keys’, the final sequence of a trapped key interlocking system involves using the ‘Access Key’s, that were released from the key exchange unit, to unlock the mechanical door locks holding each of the machine's guard doors closed.  A mechanical door lock is unlocked by inserting and trapping the correctly coded ‘Access Key’, enabling the mechanical door locks actuator to be released to now permit access inside the hazardous area.

By using mechanical door locks to control access into hazardous machine areas, this completely eliminates the need to run copious amount of cabling to each of the guard doors that would be required for electrical interlocking devices such as safety gate switches. As there are no wiring requirements for safeguarding a machine's access points, trapped key interlocking systems can be installed in a much faster timeframe than any other form of safety interlocking devices.

For added protection and personnel security, it is recommended that a double door lock system is used which enables the removal of a ‘Safety Key’ after the mechanical door lock has been unlocked. This key should remain on the operators person while they work inside of the machine to prevent the risk of unexpected machine restart.

DM/DMS Mechanical Door Locks

The DM and DMS (stainless steel variant) are purely mechanical door interlocks that, when combined with a mechanical actuator, hold a machine's guard door locked closed until it is unlocked by inserting and trapping the correctly coded 'Access Key' into the units locking mechanism. 

Both the DM and the DMS units can be equipped with stainless steel dustcovers to protect against dust ingress. For added protection, DM & DMS units can be fitted with multiple locks allowing operators to carry a 'Safety Key' on their person while they work inside the danger zone. 

Check the Specs

For more information on these products, download the technical datasheets using the following link to view the products technical specification, safety related data, dimensional drawings and best practice in terms of installation and maintenance.  

DMS2E Mechanical Door Lock with Forced Safety Key Extraction

The DMS2E is a double mechanical door interlock that prevents the actuator from being disengaged until the top 'Safety Key' has been removed from its lock. This unit has been designed to force operators to retain the 'Safety Key' on their person while on the inside of the machine to mitigate the risk of unexpected machine restart. 

The unit is supplied in stainless steel as standard with dust covers to protect against dust ingress but each lock can be fitted with a padlockable variant for Lockout / Tagout procedures. 

Check the Specs

For more information on these products, download the technical datasheets using the following link to view the products technical specification, safety related data, dimensional drawings and best practice in terms of installation and maintenance.  

DMSK Hygienic Stainless Steel Mechanical Door Lock

The DMSK is a casted stainless steel door interlock that has been designed for use within hygienic applications such as the Food and Beverage industries whereby a build up of food in the units crevices could lead to potential contamination issues.

To avoid this, the unit is constructed with virtually no crevices to reduce the likelihood of dirt entrapment. These units are also fully suited to pressure washing or steam cleaning. For added protection, the unit is supplied with stainless steel dust covers as standard but can also be fitted with padlockable variants, 

Check the Specs

For more information on these products, download the technical datasheets using the following link to view the products technical specification, safety related data, dimensional drawings and best practice in terms of installation and maintenance. 

Still unsure on safety?

If you are currently working on a machiney safety project and are unsure of the best way of safeguarding your machine, we can help you to specify the appropriate safety device based upon your application. 

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