Bolt locks for freight car, trailer truck and air cargo doors
First Claim
1. In a freight vehicle having a doorway, a door movably mounted on the vehicle for opening and closing said doorway, said door having a portion movable adjacent a portion of the doorway when the door is closed, co-operating bolt and detent means respectively mounted on said portions for at times locking the door in closed position, said bolt means including an air pressure cylinder and a movable bolt member mounted on one of said portions, said cylinder having a movable piston therein, bolt-restraining means coupled to said piston, said detent means comprising a detent element mounted on the other portion and being lockingly engagable by said bolt means, means to at times admit pressure air into said cylinder, wherein said bolt means comprises a bolt slidably mounted on said door portion, and wherein said detent means comprises a socket element on said doorway portion located to receive said bolt, an air chamber on said door, conduit means communicatively connecting said chamber to said cylinder for admitting pressure air to said cylinder, a normally sealed pressure air container in said chamber, means for changing the position of said container in said chamber, and means to unseal said container responsive to a change of position of said container in said chamber.
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Accused Products
Abstract
Anti-tampering bolt locking devices for hinged or sliding railway freight car or for other freight vehicle doors. The bolt locking devices may consist of air pressure or electromagnetically controlled bolt detents which may be either locally or remotely operated. The bolts may be directly operated by air pressure cylinders. Compressed air cartridges may be employed as the compressed air source. The cartridges may contain small quantities of lubricant such as graphite, or the like.
19 Citations
7 Claims
- 1. In a freight vehicle having a doorway, a door movably mounted on the vehicle for opening and closing said doorway, said door having a portion movable adjacent a portion of the doorway when the door is closed, co-operating bolt and detent means respectively mounted on said portions for at times locking the door in closed position, said bolt means including an air pressure cylinder and a movable bolt member mounted on one of said portions, said cylinder having a movable piston therein, bolt-restraining means coupled to said piston, said detent means comprising a detent element mounted on the other portion and being lockingly engagable by said bolt means, means to at times admit pressure air into said cylinder, wherein said bolt means comprises a bolt slidably mounted on said door portion, and wherein said detent means comprises a socket element on said doorway portion located to receive said bolt, an air chamber on said door, conduit means communicatively connecting said chamber to said cylinder for admitting pressure air to said cylinder, a normally sealed pressure air container in said chamber, means for changing the position of said container in said chamber, and means to unseal said container responsive to a change of position of said container in said chamber.
Specification