Door check

Claim 1

A DOOR CHECK OF THE CLASS DESCRIBED, COMPRISING A U-SHAPED BRACKET ADAPTED FOR MOUNTING ON A STATIONARY BODY AND HAVING A PAIR OF SPACED APART UPPER AND LOWER LEGS; A PIN PROJECTED THROUGH SAID LEGS AND ROTATABLE RELATIVELY THERETO; A SLEEVE EMBRACING SAID PIN ADJACENT ONE END; A COLLAR MOUNTED ON ONE END OF SAID SLEEVE; A SECOND SLEEVE EMBRACING SAID PIN ADJACENT THE OPPOSITE END; A COLLAR MOUNTED ON SAID SECOND SLEEVE; A SCREW MEANS FOR ADJUSTING SAID POSITION OF SAID SECOND NAMED COLLAR RELATIVE TO THE LOWER LEG OF SAID BRACKET AND MOVING SAID SECOND NAMED COLLAR TOWARD AND AWAY FROM SAID FIRST NAMED COLLAR; A SPRING EMBRACING SAID PIN AND EXTENDING FROM COLLAR TO COLLAR AND HAVING AN ANGULARLY TURNED END PROJECTING INTO EACH OF SAID COLLARS; SAID FIRST NAMED SLEEVE HAVING A PAIR OF DIAMETRICALLY OPPOSITE INCLINED SLOTS; A STUD PROJECTING THROUGH SAID PIN AND ENGAGING IN SAID SLOTS; AN ARM FIXEDLY CONNECTED ON SAID PIN AND PROJECTING OUTWARDLY THEREFROM; A TUBE MOUNTED ON SAID ARM AND PROJECTING OUTWARDLY THEREFROM; A ROD PIVOTALLY CONNECTED TO ONE END OF A SWINGABLE DOOR AND PROJECTED AT ITS OPPOSITE END INTO SAID TUBE; AND A PISTON MOUNTED ON SAID OPPOSITE END OF SAID ROD AND SNUGLY ENGAGING SAID TUBE, THE SWINGING OF SAID DOOR EFFECTING A ROTATION OF SAID PIN.