Abstract: A resilient and stretchable cover for a therapeutic support cushion comprises an opening formed by detaching overlapping end portions of its top and bottom walls provided with an adhesive fastener tape secured thereto. The cover also includes a transversely disposed vertical partition comprising two overlapping detachably adherent sections, thereby forming two separate chambers, each adapted for accomodation of a support cushion.

Abstract: A switch including a rotor within a housing with the housing including a circular array of phototransistors. The rotor includes light transmission means such as a fiber optic which transmits light from a centrally located diode to a selected phototransistor. Each phototransistor is in circuit with a power source and with an output lead. A detent retains the rotor against undesired movement.

Abstract: A face mask in which an air filter insert is confined in place between mask components with a mask main member being at least partially reversible to facilitate filter insert replacement. A filter element, also of a pliable nature, fits within and conforms to the main member. A modified form of mask includes a main member having a liner portion which, during mask use, folds over and confines the filter element in place and, upon temporary unfolding of the liner portion, facilitates filter removal and replacement. Provision is made for support of a countercurrent exchange medium, such as a metallic sponge, within the mask. A modified mask includes a mesh member and a shell secured to the main mask member in a manner permitting the main member to be turned inside out. A further modified mask is of molded construction having an inwardly folded liner portion.

Abstract: A face mask for use in hazardous environments and comprising an elastic sheet for securement about the lower face and head. The sheet is partially folded to define an open area located forwardly of the wearer's nose and mouth and within which area is removably attached a filter body which may also constitute a countercurrent exchange medium. Fabric closure material on the elastic sheet and filter body serves to removably attach the filter body in place. Additional fabric closure strips of the hook and loop type, when mated to one another, hold the elastic sheet in a partially folded shape to define the aforementioned open area. The filter body may be of a fibrous nature or a molded nose cup shape.

Abstract: A power transmission unit with a power input lever which oscillates about a first axis. A driven member of the transmission unit oscillates about a second axis, parallel to the first axis, embodied within a rockshaft. The range of arcuate travel imparted to the rockshaft is determined by the proximity of a drive pin coupling a lever carried drive member to a driven member carried by the rockshaft. An oscillating sector gear on the rockshaft drives a spur gear which, in turn, drives ratchet teeth equipped ring gear means. The gear means cooperate with pawl means on an output shaft to rotate the shaft in a unidirectional, incremental manner.

Abstract: A mask for use in severe arid climates which includes a countercurrent exchange medium, confined within a mask shell, which salvages heat and moisture given off during exhalation for subsequent transfer to inhalation air. A shaped mask member forms the mask to fit snugly over the lower face and nose. A normally closed opening in the mask shell permits access to the mask interior and to the countercurrent exchange medium. Tubular inserts provide supplemental quantities of the medium as well, in a modified form, provide an interface for additional respiratory gear.

Abstract: A back pack frame is comprised of tubular frame members which upon separation permit extraction of pairs of tent frame components stowed therein. The frame members and tent frame components are thereafter rejoinable to provide a geodesic tent frame. The tent frame components, upon extraction from a stowed position within the back pack frame members, are positioned in a divergent manner as permitted by a wire hinge component interconnecting the paired tent frame components. The back pack frame members are slotted at their ends to permit such divergent positioning of the associated tent frame components and include limit stops to prevent complete separation of the tent frame components from their frame member. The back pack frame members themselves are coupled to one another by flexible wire inserts and, in a modified form, by molded socket members. A back pack bag may be supported either externally on the back pack frame or, alternatively, over frame members.

Abstract: A back pack formed from a folded sheet of fabric with the sheet constituting the floor of a tent with a tent canopy being attached to the sheet perimeter. Sleeves formed in the sheet of fabric slidably receive a length of webbing which functions as a pack harness and also to apply compression loads to the loaded pack. Zipper halves sewn to the fabric sheet retain the pack in the general configuration of a back pack and define the lateral limits of a pack stowage area which area is additional to a tent canopy stowage area. Corner located zippers permit the forming of sleeve-like passageways through which webbing segments pass, which passageways constitute still another stowage area of the pack. Additional pack compression is accomplished by a line extending through the above mentioned sleeves and through an additional pair of sleeves integral with the fabric sheet.