(under subclass 354.1) A support wherein means is provided to lock said members against collapse in any of a plurality of predetermined selected positions of relative movement.
(1) Note. For a patent to be appropriate for this subclass and the one indented hereunder, as well as more specific subclass 354.5 above, the locking structure must be such as to lock the members together in a finite number of adjustable positions, subclass 354.1 is appropriate for a patent having an infinite number of adjustable positions, such as by use of friction or deformable clamp for a locking member, while 354.2, 354.3, or 354.4 are appropriate for patents having either a finite or infinite range of adjustment depending on whether such specific structure is included as defined in such latter subclasses.
