Circuit breaker trip and release type control mechanism

In a trip and release type control mechanism comprising:

• two laterally spaced bed-plates,
• a main connecting rod,
• aligned elongated openings within flanges,
• an axle projecting through said openings and extending between said bed-plates and being articulated to one end of said main connecting rod,
• a trip knob articulated to said axle for movement therewith along with said main connecting rod,
• a secondary connecting rod,
• a retaining connecting rod,
• said secondary connecting rod being articulated on one end with the other end of said main connecting rod and being commonly articulated to one end of said retaining connecting rod,
• said elongated openings comprising at one end a notch into which said axle falls when the control mechanism is in trip position,
• a control cam, said control cam being articulated to the other end of said retaining connecting rod, said control cam comprising two cylindrical shoulders, a through hole drilled within said cylindrical shoulders for inserting a control shaft, said control cam being mounted for pivoting about said cylindrical shoulder,
• a pin mounted to said retaining connecting rod at a point remote from the articulation of said retaining connecting rod to said main connecting rod and said secondary connecting rod,
• a latch,
• a pivot pin spanning between said bed-plates for pivotably mounting said latch therebetween,
• a first spring coiled about said latch pin pivot and pressing said latch in release position against a first stop,
• a roller freely rotatable about said pin mounted to said retaining connecting rod on an edges of said latch,
• the improvement comprising:
• second elongated openings within said bed-plates for receiving respective ends of the pin to which said roller is mounted,
• a release lever pivotably mounted at one end of said bed-plates at a position intermediate of said bed-plates and having at an opposite end facing the side of said latch, a catch stop fixed to the end of said release lever facing the side of said latch, said release lever comprising at least one ramp intermediate of said catch stop and said release lever pivot axis, said release lever extending parallel to said bed-plates and normally contacting said latch at a position above said catch stop,
• a second spring for biasing said release lever into contact with the side of said latch,
• a release knob mounted adjacent said release lever for movement along the side of said release lever and comprising a finger for contact with said at least one ramp to force said release lever to pivot against the bias of said second spring means away from the side of said latch to release said latch, and
• a third spring for biasing said trip knob to raised position at the end of said first elongated opening remote from said notch;
• whereby, longitudinal movement of said release knob causes said finger in contacting said ramp to cause said release knob to release said latch whereby pivoting away from said latch, thereby permitting said latch to ride over the catch stop carried by said release lever.