Braking pressure control device for automotive vehicles

A proportioning braking pressure control device for automotive vehicles said device comprising a housing, a fluid inlet, a fluid outlet, a regulating valve, means including a regulating piston and a valve closure member, a regulating spring acting on said regulating piston, said regulating piston subjected to fluid pressure at said outlet to be urged to seat on said valve closure member adjacent the force of said regulating spring, said regulating piston and said valve closure member thereby coacting with each other to modulate fluid communication between said inlet and said outlet, said valve closure member operatively associated with an inlet pressure responsive control means, including a control piston and a control spring, said control piston progressively displaced against the force of said control spring in response to increasingly control inlet fluid pressure, said valve closure member coupled to said control piston to be displaced away with said control piston to prevent said modulation of fluid communication between said inlet and said outlet;

• and, an inertia member, support means mounting said inertia member to be shiftable from a gravity biased position to an advanced position when said vehicle experiences a predetermined deceleration rate, latching engagement means operative to stop the displacement of said control piston in at least one axial direction in response to shifting of said inertia member to said advanced position, said latching engagement means includes a locking member progressively displaced with said control piston and a series of latching engagement features on said inertia member and said locking member moved into latching engagement at various displaced positions of said control piston and locking member upon shifting of said inertia member to said advanced position to stop further displacement of said control piston from said displaced position whereat said latching engagement occurs.