Abstract: A retrievable toggle bolt for mounting an object on a drywall or other hollow wall structure includes a headless bolt having a threaded shaft with a terminal portion for insertion through a hole in the drywall. A toggle is engaged by a pivot-and-slide engagement configuration with the terminal portion of the headless bolt so that the toggle is free to pivot relative to the headless bolt about a pivot axis substantially perpendicular to the direction of elongation and the pivot axis is slidingly displaceable along part of the toggle roughly parallel to the length. The pivot-and-slide engagement configuration links the toggle to as to rotate together with the headless bolt about an axis parallel to the direction of extension. The result is a toggle bolt which can be switched between an insertion/removal state and a locked state by simply turning the headless bolt through a half-turn about its axis.

Abstract: A fluid distributor system is described comprising a circular distributor plate formed with a central opening connected at one side of the plate to a fluid inlet pipe, and a plurality of outlet openings arranged in a circular array around the outer periphery of the distributor plate and each connected at said one side of the plate to one of a plurality of outlet pipes. A rotary distributor arm is rotatably mounted on an axis passing through the center of the distributor plate and in spaced relationship with respect to its opposite side. The distributor arm is formed with a passageway having an inlet at its center aligned with the inlet opening, and an outlet at its end selectively alignable with one of the peripheral outlet openings according to the selected rotary position of the distributor arm.