Abstract: The alternating pressure cushion is a cushion for prevention and treatment of decubitus ulcers in hemodialysis patients, patients who are wheelchair bound, and other persons confined in a seated or reclined position for a prolonged period. The alternating pressure cushion has a back cushion section, a seat cushion section including an inflatable lumbar support, and a leg cushion section, each section having a plurality of air bladder networks. The air bladder networks are arranged so that each provides support when inflated. When one air bladder network is inflated to support the patient, the other air bladder is deflated to relieve pressure from areas of the patient's body. Alternately inflating and deflating the air bladder networks supports the patient without prolonged pressure points.

Abstract: The alternating pressure cushion is a cushion for prevention and treatment of decubitus ulcers in hemodialysis patients, patients who are wheelchair bound, and other persons confined in a seated or reclined position for a prolonged period. The alternating pressure cushion has a back cushion section, a seat cushion section, and a leg cushion section, each section having a plurality of air bladder networks. The air bladder networks are arranged so that each provides support when inflated. When one air bladder network is inflated to support the patient, the other air bladder is deflated to relieve pressure from areas of the patient's body. Alternately inflating and deflating the air bladder networks supports the patient without prolonged pressure points.

Abstract: A coping device includes a circular blade, a template having an end with a coped profile, a stylus which traces the coped profile of the template and which preferably has substantially the same width and radius of curvature as the blade, and a base having a stationary portion and a movable portion movable in X and Y directions relative to the stationary portion. The blade and the stylus are both coupled to the movable portion and a table is coupled to the stationary portion. The blade and stylus are movable relative to the table so that the molding on the table can be coped with the blade as the stylus traverses the coped profile of the template on the table. The blade and the stylus have corresponding widths and contours. In addition, when coping a crown molding, the blade and the stylus are tiltable to the same angle.

Abstract: A drill screw includes a boring end having cutting edges adapted to cut when rotated in a counterclockwise direction, and a portion having threads adapted to enter a piece of molding when rotated in a clockwise direction. The drill screw is driven into a piece of molding in the counterclockwise direction to bore a hole therethrough and cause the threads to meet the face of the molding. The drill screw is then rotated in the clockwise direction to cause the threads to tap into the molding, bore through the wall behind the molding, and contact a jackpost behind the wall. Rotation of the drill screw thereafter causes the molding to ride outward from the wall and over the drill screw such that the molding contacts an adjoining piece of molding at an inside corner and thereby substantially eliminating any gap therebetween.

Abstract: A drill screw includes a boring end having cutting edges adapted to cut when rotated in a counterclockwise direction, and a portion having threads adapted to enter a piece of molding when rotated in a clockwise direction. The drill screw is driven into a piece of molding in the counterclockwise direction to bore a hole therethrough and cause the threads to meet the face of the molding. The drill screw is then rotated in the clockwise direction to cause the threads to tap into the molding, bore through the wall behind the molding, and contact a jackpost behind the wall. Rotation of the drill screw thereafter causes the molding to ride outward from the wall and over the drill screw such that the molding contacts an adjoining piece of molding at an inside corner and thereby substantially eliminating any gap therebetween.

Abstract: Protective liner for bicycle or motorcycle tires with a flexible, extruded U shaped length of PVC foam that conforms to the inner diameter of a conventional bicycle tire, a method of curving the U shaped extruded foam liner so that it takes on the diameter of a bicycle tire, and a method of inserting the U shaped extruded liner into a bicycle tire. A preferred embodiment includes the liner is made of PVC foam nitrile polymer type 3pns322 from Kirkhill Rubber.

Abstract: A coping device includes a circular blade, a template having an end provided with a coped profile, a stylus which traces the coped profile of the template and which preferably has substantially the same width and radius of curvature as the blade, clamps for respectively securing the molding and the template in a fixed position, and a base having a stationary portion and a movable portion movable in X and Y directions relative to the stationary portion. The clamps are coupled to the stationary portion, and the blade and the stylus are both coupled to the movable portion. The blade and the stylus are substantially simultaneously movable relative to the clamps so that the molding can be coped with the blade as the stylus traverses the coped profile of the template. The blade and the stylus have the same width, and the stylus is provided with a leading edge having a radiused contour matching the blade. In addition, when coping a crown molding, the blade and the stylus are tiltable to the same angle.

Abstract: A projector having a rolling loop film transport mechanism is provided with a film decelerating cam unit that is located in advance of the aperture of the projector. Deceleration pins carried by a pair of vertically spaced arms that project from the cam unit engage in upper and lower marginal perforations in the film and travel with the film towards the aperture and decelerate the film as each frame is advanced. The cam unit includes two cams, one of which causes the decelerating motion of the pins, and a return motion in the reverse direction, while the other cam causes the pins to advance and retract into and from the film path respectively. By positively retracting the pins, their return movement against the direction of film travel can take place independent of the motion of the film. As compared with the prior art, acceleration forces and resultant stresses on the cam are reduced and the cam unit can operate at higher frame rates and/or with smaller rotor gaps.

Abstract: Projected image misalignment in a 3-D motion picture projector is corrected by shifting one of the projection lenses in accordance with a predetermined program during presentation of the motion picture. In one embodiment, manually initiated control signals for adjusting the lens shift are recorded in a memory and can be subsequently retrieved for automatically controlling lens shift. In another embodiment, lens shift is controlled by reading predetermined witness marks on the film.

Abstract: A camera for producing 3-D motion pictures has "left eye" and "right eye" camera lenses and two corresponding film transport mechanisms. Images to be recorded on films transported by the mechanisms are reflected by semitransparent mirrors and the mechanisms and the mechanisms are arranged so that the mirrors turn the images transversely of the films. Contact prints made from the films can then simply be turned face-for-face to correct for the image reversals due to the presence of the mirrors. The contact prints are then correctly oriented for projection.

Abstract: In an alternate eye 3-D motion picture projection apparatus of the rolling loop type, light projection is accomplished by the combination of focal plane shutters that are coupled to the rotor of the projector and a supplementary shutter arrranged to trim the projected light so that discrete "left eye" and "right eye" images are projected. Various embodiments are disclosed in which a rotary blade shutter is located at the stop of the projection lens. Where there are two projection lenses, a single blade or two counter-rotating blades trim the light projected through both lenses.

Abstract: A method of producing and displaying a 3-D motion picture is disclosed. Two master film negatives are prepared using a camera rig employing one camera that looks directly at the subject through a semi-transparent mirror and a second camera that looks at the same subject by way of the reflective surface of the mirror, to obtain left and right eye images. The cameras are oriented so that the mirror images recorded by the second camera are turned laterally of the film in being reflected by the mirror. Contact prints are made from the negatives. Before projecting the images, the contact print from the negative that was shot by way of the mirror is turned about its longitudinal axis so that images on that print are turned laterally. Images from the two prints are simultaneously projected onto the same screen to produce a coincident 3-D image. The left and right eye images are optically coded, for example by using optical filters that are polarized at right angles to one another.

Abstract: A film support element assembly is disclosed, primarily for supporting film in relation to a projection aperture in a motion picture projector having a rolling loop film transport mechanism. In a preferred embodiment the film support element is a so-called "field flattener" and has a cylindrically curved surface over which successive frames in the film are laid by the mechanism. Cleaning means are provided adjacent the film path and the lens element can be displaced to bring a fresh portion of the surface into the film path. At the same time, the cleaning means remove debris from the surface. In one embodiment the lens element is vibrated to discourage adhesion of debris.

Abstract: A projection screen assembly is disclosed. The assembly includes a screen which can be lifted into an extended position or lowered into a collapsed configuration for permitting a building in which the screen is installed to be used for other purposes. Lifting means is provided for raising the screen and tensioning it in the vertical direction. Lateral tensioning is effected simultaneously by tensioning elements disposed one adjacent each side edge of the screen. The tensioning elements are coupled to the screen by lateral tensioning members which are of progressively decreasing length in directions extending inwardly from the upper and lower margins of the screen so that the tensioning elements adopt the shape of caternary curves. When the screen is tensioned vertically, these curves are flattened so that the screen is tensioned laterally by the lateral tensioning members.

Abstract: A film support element assembly is disclosed, primarily for supporting film in relation to a projection aperture in a motion picture projector having a rolling loop film transport mechanism. In a preferred embodiment the film support element is a so-called "field flattener" and has a cylindrically curved surface over which successive frames in the film are laid by the mechanism. Wiper elements are provided above and below the film path and the lens element can be displaced to bring a fresh portion of the surface into the film path. At the same time, the wiper elements remove debris from the surface. The wiper elements are removable for disposal of collected debris.

Abstract: Inlet guide structure is provided having complementary outer and inner guides which are adapted to receive film from a drive sprocket of a rolling loop film transport mechanism and to guide the film inwardly towards a path defined between the stator and the rotor of such a mechanism. The outer and inner guides have respective pairs of co-operating side faces for guiding side portions of the film remote from a centre portion of the film. The side faces of the outer guide define a rounded nose portion intermediate ends of these side faces, and the side faces of the inner guide define a depression corresponding to the nose portion so that when in use the guides combine to form a passage which guides the film by contact between the side faces and the side portions of the film.