Keyhole Guards TRIZ Cases

A tool operated channel latch uses an over center toggle mechanism to retain a bolt in a locked position.

A plug assembly with a movably mounted sidebar and rack pins featuring true gates that allow radial inward movement.

A pivoting cover shields the operating lever of double-leaf window fittings, blocking unauthorized access while allowing easy manual operation.

A sliding locking element enables padlocking on a box closure without disassembly.

Segmented locks and mutual identification keys prevent unauthorized access while ensuring correct repositioning for customers with reduced mobility.

A supplemental lock mechanism blocks handle rotation via a secondary axis actuator, preventing toddlers from opening the door unsupervised.

Segmented spindles resolve the complexity trade-off by isolating outside actuation, ensuring secure residential privacy without added components.

A rotatory emergency stop cover integrates a plug-in unit with a cam mechanism to actuate the stop button synchronously.

Interchangeable bolt modules in a standardized lock case reduce inventory costs by enabling versatile function expansion without structural complexity.

A pivotally mounted ventilation flap connects to a window locking mechanism via a hinge lock, preventing forced opening from the exterior.

A removable handle return cartridge uses a torsion spring to bias the hub toward a home position.

Segmentation and intermediary principles prevent unauthorized manipulation by using a locking element to constrain the stop element's mobility.

A lock clutch mechanism uses resilient members to push clutch components against linkage parts for rapid engagement.

Segmenting the latch into a sliding bolt and turning-back bar creates multi-point locking, resolving the trade-off between security and structural complexity.

A contoured shell accommodates a handle pivot and positions a cylinder lock above the mechanism to prevent interference with rotation.

Rotating blocking discs selectively engage connecting levers to transmit rotation, eliminating the need to remove securing elements for mode switching.

Radial projections on a door lever lock independently to prevent child access while allowing adult operation.

A fire door lock lever moves horizontally to deactivate the latch bolt withdrawal mechanism.

A cylindrical lock assembly reconfigures between clutching and non-clutching orientations via a rotating outer housing.

Segmented hub locker assemblies allow manual override of the lock bolt, resolving security gaps during power failures.

An escapement assembly stores energy in a spring during torque attacks, forcing the lock into position once handle orientation returns.

An integrated fixing element maintains axial positioning and compensates for door thickness tolerances, eliminating complex spacer selection during assembly.

Flexible wipers on a padlock cover apply friction to retain keys against spring ejection forces while blocking debris entry.

A locking mechanism holds a movable body to a supporting body using a manipulating member and holding member.

A magnetic gate latch uses a keeper safety catch to retain the lower latch pin in its recessed position.

Segmented interior and exterior actuation mechanisms allow emergency egress without unlocking, resolving the security versus access contradiction.

A cylinder lock uses a torsion spring to store energy from a brief motor pulse for reliable blocking.

A door lock employs a thumb turn switch to activate a lighting element, transmitting light through a translucent lid to resolve ambiguity in locking status.

Hinged locking members capture pistol grip handles to prevent accidental operation and hazardous energy release during maintenance.

A door lock clutch mechanism transmits torque to open the door during normal operation.

Segmented aircraft door handle uses sector gears to actively equalize pressure before latching, preventing uncontrolled opening from differential forces.

A dismountable key separates into a shank and replaceable blade via an intermediary grab mechanism.

Conjugate linear guides and radial orifices simplify the mechanism while maintaining locking reliability.

A concentric handle coupling mechanism uses an axially displacing activating member to drive a radially moving engaging member.

An internal trigger button and silicon sleeve seal the housing, resolving liquid ingress risks while enabling two-sided access.

Segmented dust valve prevents key insertion interference while blocking dust entry.

Offset spindles enable a single rosette, avoiding thicker designs that disrupt visual uniformity.

Integrating the locking mechanism into the handle neck eliminates separate components, simplifying assembly while maintaining one-sided lock functionality.

A motor-driven clutch assembly connects door handle shafts using a movable member with uneven portions and a coil spring.

A privacy lock cam mechanism converts linear slider motion into rotational force to engage a locking lug.

A compressible carbon conductor bridges a spaced data port and contact to absorb mechanical loads and prevent moisture damage in electronic locks.

Radial slots in actuator plates balance off-axis loads from linkage bars, reducing moving parts and improving operational smoothness.

Spring-loaded latching members automatically return to a locked position via cam rotation, preventing animal access without requiring manual re-engagement.

Shear pin bends upon keeper misalignment, moving latch to intermediate position and preventing interference.

An inner follower and toggle lever assembly eliminates extra spindles for hand swapping, reducing device complexity while maintaining reliability.

Segmented coding tools separate blanks into disks for keys and locks, resolving the trade-off between manufacturing precision and production efficiency.

A cam lock uses a spring and bush ring to shift the cam part axially when opened.

A lock cylinder plug deforms under force, triggering a sensor assembly to detect structural changes.