Door lock for a railroad car
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United States of America Patent
Stats
-
Mar 4, 2003
Grant Date -
N/A
app pub date -
Sep 12, 2001
filing date -
Sep 15, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention reveals a lubricant-free door lock for railroad cars and particularly auto rack railroad cars, which eliminates the need to use grease or other lubricants to lubricate the door locks. The lubricant-free door lock generally includes a stainless steel cylindrical tube or housing and a cylindrical replaceable plastic bushing mounted in the housing the prevent the steel-on-steel contact between a locking pin and the inner walls of the housing. A washer or plate connected to the bottom end of the housing maintains the bushing in the housing. The door lock also includes a spring mounted in the housing between the bushing and an end cap positioned over the locking pin. A stop extends transversely through the housing, end cap and locking pin to limit the movement of the locking pin. The bushing eliminates the need for a lubricant between the steel locking pin and the steel inner walls of the housing.
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