VERROUILLAGE A CAME POUR PLOMBAGE

摘要

A cam activated mechanism which permits a railroad car door to be sealed only when the door is in a fully closed position. The mechanism is activated by the final rotation of a car door operating lever or handle. An aperture is provided in the handle to allow the insertion of a car seal when the handle is rotated to the proper final position between spaced opposed arms of a sealing fork. Turning the handle imparts rotational movement to a shaft which drives a pinion in meshed engagement with a segmental gear rotatably mounted between the base and cover plates on the car door. The rotational movement of the pinion thus turns the segmental gear. A cam slot is located in the segmental gear and is adapted to admit one end of a cam crank pivotally mounted on the base plate to provide a rocking motion such that the other end of the cam crank which is attached to a bar provides rectilinear motion to the bar. The cam slot is so situtated on the segmental gear that it will accept the one end of the cam crank only when the door is closed. Spaced below the segmental gear adjacent the handle is a sealing fork, the housing for which is essentially a U-shaped bracket having two legs and an intermediate portion therebetween by which it is secured to the base plate. The bracket lies within the periphery of the circumference projected by the handle. A rod having a locking surface thereon is journalled in the legs of the U-shaped bracket and the handle interfering sealing fork arms are fixedly mounted on said rod. The arms are apertured to allow the insertion of a car seal therethrough when said apertues are aligned with the corresonding aperture in the handle. The rectilinearily moving bar has a lateral projection adapted to contact the rod having the locking surface when the one end of the cam crank is dislodged from the cam slot in the segmental gear. The cam crank is in a dislodged position whenever the door is not closed and the sealing apertures are thus prevented from being aligned since the arms are prevented from being positioned on either side of the handle to lock it in place. When contact is effected between the bar and rod, the sealing fork arms are positively held in a position out of the path of the handle so that the handle may be rotated. A seal may be passed through the apertures in the handle and the arms of the sealing fork to seal the railroad car only when the cam crank end is in the cam slot and the door is fully closed.