US PATENT SUBCLASS 104 / 172.2
.~.~ Tow pin or mast
Current as of: June, 1999
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DEFINITION
Classification: 104/172.2
Tow pin or mast:
(under subclass 172.1) Car-propelling means in which the car carries a movably attached car-propelling pin or member wwhich is movable through a guide slot into engagement with a traction chain moving within a channel disposed behind the guide slot; the weight of the car and its load, if any, is supported on a floor surface while the car is propelled and guided along the floor surface by the moving traction chain.
(1) Note. Although the drive chain usually moves along a level below that of the surface which supports the car (i.e., below floor level), also included herein is a drive chain moving along a level above the car, in which case the car carries a rather long upwardly extending mast-like member in order to engage the overhead drive chain.
