Abstract: A cabinet is disclosed which is generally rectangular and may have a plurality of drawers therein. A top section, however, may be lifted and rotated outwardly to form a drawing board which is angularly adjustable and includes sufficient knee room to permit an artist to comfortably sit at the drawing board. The drawing board is mounted on a U-shaped support disposed within the cabinet and is hingedly attached to the forward edge thereof. The support forms J-slots in opposed legs of the U. The cabinet frame supports outstanding walls received within the U which mount rollers adapted to ride in the J-slots. The drawing board portion of the top then with the attached U-shaped member is lifted upwardly and outwardly as the rollers travel along the J-slots to lock in an upright position for use. A slotted brace also is provided with a locknut connecting the rear portion of the board with the legs of the U so that the rear portion of the board may be elevated to provide the desired sloping surface.

Abstract: A portable, battery powered smoke detector in which the operative components are compactly and efficiently arranged in such a manner that they may be housed in a pocket-sized casing approximating the shape and size of a cigarette package. A further embodiment shows an efficiently organized arrangement of the smoke detector components in a telephone set.

Abstract: An adjustable straight edged device for use with a drafting board includes a straight edged blade which is adjustable to different angular orientations on the drafting board and is positively and precisely aligned in a horizontal orientation across the board. The device includes a platform slidably mounted for movement along one side of the drafting board on which the blade is mounted. The platform includes a pivot pin and preferably guide pins which are disposed to respectively, engage an elongated slot and pins about an end angle provided on the straight edged blade to slidably and pivotally attach the blade to the platform. In an alternative embodiment a single guide pin is used which engages a notch in the straight edged blade. This arrangement allows the straight edged blade to be repeatedly and accurately aligned in its horizontal orientation. A clamping knob is provided on the pivot pin for locking the blade in place on the platform.