Apparatus and methods for lifting a load and shifting it laterally by an elevating means applied through a support from which a load engager is suspended and including one of the following:
A load engager freely suspended by a flexible member.
A bridge* or a boom* on which a load-supporting trolley* is adapted to move to shift the load laterally.
A trolley,* per se.
A vertically swinging boom* claimed without regard to a self-loading or unloading feature (e.g., a bucket, fork, or grab type load engager).
(1) Note. This class is the residual locus for boom sluing or luffing apparatus and subcombinations thereof which are otherwise unprovided for. (2) Note. Subclasses 71 through 345, inclusive, were not screened during reclassification of the remaining subclasses. Accordingly, those subclasses preceding subclass 71 will be found to contain all relevant patents except those claiming linear hoists.
Lines with other classes and within this class
In the Class Definition above, regarding vertically swinging booms, apparatus having a vertically swinging boom comprised of relatively movable segments and disclosed as having a self-loading load engager (e.g., a backhoe or steam shovel) are self-loading apparatus and should be considered for Class 414, Material or Article Handling. (Note, however, that in accordance with the other part of the Class Definition, regarding load engagers, if the load engager is suspended by a flexible member, the apparatus is proper for Class 212).
The "lateral shifting" criterion specified in the class definition requires more than merely supporting a hoist on a wheeled vehicle to render the hoist ambulant. See search notes to Class 254 below.
As indicated in the general search notes below, many classes provide for traversing hoists of specific application, which generally include but are not limited to those patents which claim load engager structure peculiar to the specified application.