Door lock

Claim 1

AN EMERGENCY-EXIT LOCK INCLUDING AN ACTIVE CASE COMPRISING A BASE SECTION, A LATCHBOLT PIVOTALLY MOUNTED ON SAID BASE SECTION AND NORMALLY BIASED TOWARDS LATCHING POSITION OUTWARDLY OF SAID SECTION, SAID LATCHBOLT HAVING A TAIL THEREON, A SUPPORTING COVER ON SAID BASE SECTION, AN OPERATING LEVER PIVOTALLY MOUNTED ON A SHAFT ON SAID COVER A PANIC-BAR SECURED TO SAID OPERATING LEVER, AN OPERATING FINGER PIVOTALLY MOUNTED ON SAID SHAFT AND ENGAGEABLE WITH SAID TAIL ON THE LATCHBOLT, AN ABUTMENT BETWEEN SAID OPERATING LEVER AND SAID OPERATING FINGER FOR ROCKING SAID FINGER ABOUT SAID SHAFT TO RETRACT THE LATCHBOLT UPON OPERATION OF SAID PANIC-BAR, THE SAID OPERATING FINGER HAVING AN ABUTMENT THEREON, A SLIDABLE MEMBER ON SAID BASE, A ROCKER MEMBER CARRIED BY SAID SLIDABLE MEMBER AND HAVING A HOOK PORTION THEREON, SAID ROCKET MEMBER BEING ADJUSTABLE TO LOCATE THE HOOK PORTION THEREON IN OR OUT OF REGISTER WITH THE ABUTMENT ON SAID OPERATING FINGER, MANUALLY OPERABLE MEANS FOR FOR OPERATING SAID SLIDABLE MEMBER TO ENGAGE THE HOOK PORTION ON THE ROCKER MEMBER WITH THE ABUTMENT ON THE OPERATING FINGER AND THEREBY ROCK SAID OPERATING FINGER TO CAUSE RETRACTION OF THE LATCHBOLT INDEPENDENTLY OF THE PANIC-BAR, AND SEPARATE MEANS FOR ADJUSTING SAID ROCKER MEMBER TO RENDER SAID MANUALLY OPERABLE MEANS INOPERABLE.