Latchbolt Damper Module Using Dual Slowing Mechanisms for Noise Control

A damper module is introduced as an intermediary component between the latchbolt mechanism and the external environment. The damper includes a piston moving within a cylinder filled with viscous fluid, creating resistance that slows the latchbolt's extension speed without adding complex mechanical linkages. This intermediary system reduces impact forces and grinding noises while maintaining operational simplicity.

The patent changes the velocity parameter of the latchbolt by introducing a controllable resistance force. The damper module adjusts the extension speed of the latchbolt from its original high-speed free return to a controlled, slower movement. By modifying the speed parameter through fluid resistance, the system reduces kinetic energy at the point of contact, thereby minimizing impact noise and component grinding.

The damper module applies resistance selectively during specific phases of latchbolt operation. The viscous fluid resistance is not uniformly applied throughout the entire movement range but is concentrated during the critical extension phase where noise generation occurs. This localized application of damping force reduces noise during the harmful impact phase while minimizing impact on overall operation time.

The damper provides sufficient resistance during the latchbolt extension phase to achieve noise reduction, but does not overly restrict the movement. The viscous fluid allows controlled passage of the piston during normal operation, providing just enough damping to reduce impact noise without creating excessive friction that would significantly delay the latching operation.