Abstract: A write protect mechanism includes an indicator element configured for movement within a channel to indicate a write condition and a write protect condition of a data storage diskette. The indicator element can be integrally molded with the diskette housing. The indicator element is disengaged from the housing, rotated approximately ninety degrees, and reinserted in the channel prior to closing the diskette. The diskette permanently retains the indicator element within the channel. The indicator element may include spring members for exerting a bias against structures formed along side walls of the channel during movement. The spring members may include indentations for engaging the structures formed on the side walls. The structures are aligned with positions indicating either the write condition or write protect condition of the diskette.

Abstract: A press fit assembly boss for aligning and assembling the case walls of a diskette includes a circular cylindrical post formed on the upper case wall and a cylindrical socket formed on the lower case wall. The inner surface of the socket includes two opposing planar sections separated by a distance less than the outer diameter of the post. Insertion of the post in the socket deforms the post to secure the post within the socket without creating any debris during assembly or disassembly. The cylindrical post has thin walls.

Abstract: A disk cartridge includes a rotatable disk, a cartridge case for housing the disk, and a U-shaped shutter slidably disposed on the front wall of the cartridge case. The cartridge case includes a head access opening formed adjacent the front wall. The access opening is opened and closed by the shutter which is biased closed by a spring. A projection mounted on the shutter contacts and locates the spring between one of the cartridge case side walls and the projection.

Abstract: A disk cartridge includes a rotatable disk, a cartridge case for housing the disk, and a U-shaped shutter slidably disposed on the front wall of the cartridge case. The cartridge case includes upper and lower walls, and a head access opening formed in both walls adjacent the front wall to access the disk. The access opening is opened and closed by the shutter which is biased closed by a spring. A projection mounted on the shutter contacts and locates the spring between one of the cartridge case side walls and the projection. A tab is mounted on the cartridge case and contacts the projection to stop movement of the shutter when the shutter is biased in the closed position.

Abstract: A method for making packaged gel refrigerant. Polyethylene tubing having a gusset fold along each side edge is cut off in desired lengths and one end of each is heat-sealed. A metered amount of dry, powdered gel base is inserted, and the other end of the bag is then heat-sealed to provide a closed and sealed bag containing the gel base. The bags may then be shipped to a remote location. There a hollow needle is moved to pierce the bag contents through the gusset fold and next to an upper sealed end, the cut leaving a small plastic flap still attached to the bag. A jet of a metered amount of water under high pressure is then sent through the needle to combine with the powder in the lower part of the bag, and then the needle is removed, the cut flap closing most of the needle-entry opening. The water and powder are then mixed together away from that opening, the freshly formed and still forming flexible gel being thereafter distributed substantially evenly throughout the bag.