Instrument and case

The combination of an instrument and case comprising:

• an instrument having legs pivotally connected at one end with the opposite ends of said legs being selectively movable between a closed position adjacent each other and an open position spaced from each other;
• a relatively flat case having an upper surface defining an opening with a side wall conforming generally to the shape of the instrument such that the instrument may be placed therein and further including an aperture defined at one end of said opening adapted to receive an end of said instrument;
• one of the instrument and said side wall having protruding attaching means extending therefrom;
• and,
• the other of the instrument and said side wall having retention means for engaging said attaching means, whereby the instrument may be forcefully positioned in the case opening by manual action so that said attaching means embraces said retention means to releasably hold the instrument in the case.

The combination of a drafting or measuring instrument and a card for carrying the instrument comprising:

• an instrument having a pair of legs pivotally connected such that said legs may be relatively rotated between a closed position with said legs adjacent one another and an open position with said legs spaced from one another;
• a card defining an opening having lateral side walls conforming generally to the lateral edges of the instrument so that the instrument may be positioned therein, at least a portion of said opening extending through the entire thickness of the card between the upper and lower surfaces thereof;
• one of said instrument edges and said card side walls having protruding attaching means extending therefrom;
• and,
• the other of said instrument edges and said card side walls having recessed retention means for embracing said attaching means, whereby the instrument may be manually positioned in the card opening with the lateral edges of the instrument aligned with the side walls of said opening so that said attaching means engages said retention means to hold the instrument in the card and the instrument may be removed from the card opening by manual pressure applied against an exposed instrument part.

The combination of an instrument and case comprising:

• an instrument having elongate legs pivotally connected at one end and carrying working elements at the opposite ends selectively movable between a closed position adjacent one another and an open position spaced from one another, each of said legs having a lateral outer edge;
• a flat case of the same relative thickness as the instrument and having an upper surface and a lower surface, the case defining an opening extending between said upper and lower surfaces with lateral inner side walls conforming generally to the outer edges of the closed instrument and an aperture at one longitudinal end of said opening adapted to receive said working elements on the ends of said legs so that the instrument may be placed in said opening with its outer edges adjacent a corresponding inner side wall of said opening and said working elements in said aperture;
• one of each pair of corresponding leg edge and side wall having a longitudinal projection extending laterally therefrom;
• and,
• the other of each pair of corresponding leg edge and side wall having a longitudinal lateral groove for embracing its respective projection, whereby the instrument may be forcefully positioned within said case opening by manual action until said projections are located within and engage said grooves to releasably hold the instrument in the case.