Keyhole Guards TRIZ Cases

An offset toggle translates via camming motion to disengage the locking piece, resolving the security versus emergency exit contradiction.

A lock mechanism retracts both latch and deadbolts via a transmission plate and guide slot assembly.

Segmented fasteners require simultaneous two-handed operation to disengage, preventing unauthorized opening during lockdown events.

A hinged locking element rotates to block interaction elements, preventing unauthorized latch movement from external vibrations.

A molded plastic latch mechanism uses rollers and diagonal ribs to convert vertical handle motion into horizontal locking movement.

A lock device uses an adjustable latch mechanism to block unauthorized exit while maintaining easy internal access.

Reversible unlocking means on a fire door switch between passive and active states via an actuator, eliminating manual resetting after false alarms.

A magnetic latch device uses aligned blocks to drive a sliding plate through a housing opening, enabling automatic door closure.

A lock housing integrates a latch and blocking member to secure doors without separate components.

Segmented locking mechanism uses offset toggle and compression springs to maintain handle orientation while enabling emergency exit access.

A roller deadbolt lock uses a slide mechanism to retract the bolt for safe door operation.

A clamp device handle with a spur enables single-handed operation while a spring-actuated catch element provides automatic locking.