Door closing door checks

Claim 1

IN A DOOR CHECK OF THE TYPE INCLUDING A CYLINDER HAVING A HEAD AT EACH END THEREOF, A PISTON RECIPROCABLE IN SAID CYLINDER HAVING A PISTON ROD EXTENDING THROUGH THE CYLINDER HEAD, SPRING MEANS IN SAID CYLINDER CONSTANTLY URGING SAID PISTON TOWARD THE OTHER CYLINDER HEAD, THE SAID CYLINDER AND PISTON ROD BEING CONNECTABLE TO THE DOOR FRAME AND DOOR IN A MANNER TO CAUSE SAID PISTON TO MOVE IN ONE DIRECTION AND COMPRESS SAID SPRING CAUSING SAID MANUALLY OPENING THE SAID DOOR, SAID SPRING CAUSING SAID PISTON TO MOVE IN THE OPPOSITE DIRECTION AFTER SAID DOOR HAS BEEN OPENED TO CLOSE THE SAME, SAID CYLINDER HAVING A BLEED IN THE OTHER OF SAID HEADS ADAPTED TO REGULATE THE RATE OF SPRING CLOSING OF SAID DOOR, A MANUALLY SET AND READILY RELEASABLE DOOR HOLD-OPEN MEANS COMPRISING HOLD-OPEN LEVER LATCH DISPOSED DIAMETRICALLY ACROSS AND IN SPACED RELATIONSHIP TO THE END OF SAID CYLINDER HEAD HAVING AN APERTURE THERETHROUGH SLIGHTLY LARGER THAN SAID PISTON ROD AND TELESCOPED FREELY THEREOVER, PIVOT MEANS MOUNTING ONE END OF SAID LEVER-LATCH ON SAID ONE CYLINDER HEAD ADJACENT ONE SIDE SAID PISTON ROD AND EXTENDING OUTWARDLY FROM THE OTHER SIDE THEREOF, STOP MEANS ON SAID LEVER-LATCH LOCATED TO CONTACT SAID CYLINDER HEAD CAUSING SAID LEVER-LATCH TO BE DISPOSED NORMAL TO SAID PISTON ROD WHEN PIVOTED IN ONE DIRECTION ABOUT SAID PIVOT MEANS, SPRING MEANS CONSTANTLY URGING SAID LEVER-LATCH TO PIVOT TO IS SAID NORMAL POSITION WHEREIN SAID PISTON ROD MAY RECIPROCATE FREELY THERETHROUGH, SAID LEVER-LATCH PIVOTING INTO CONTACT WITH SAID PISTON ROD RESPONSIVE END MANUAL PRESSURE APPLIED TO THE OUTWARDLY EXTENDING END THEREOF AFTER SAID DOOR IS MANUALLY OPENED HOLDING SAID PISTON ROD AGAINST AXIAL MOVEMENT TO CLOSE SAID DOOR UPON RELEASE OF THE MANUAL FORCE EMPLOYED TO OPEN SAID DOOR, SAID LEVER-LATCH BEING RELEASED BY SAID LAST MENTIONED SPRING MEANS TO ITS NORMAL POSITION UPON SUBSEQUENTLY MANUALLY OPENING SAID DOOR SLIGHTLY FROM THE OPEN POSITION TO WHICH IT IS HELD BY SAID HOLD-OPEN LEVERLATCH.