Abstract: Improved mechanical fasteners, such as improved bolts and screws, are disclosed. The mechanical fasteners include a shaft portion configured to be disposed into a substrate; a head portion located at a top side of the shaft portion; and a means for securing the head portion to a substrate (and/or surrounding surfaces). The means for securing the head portion to the substrate is configured to operate independent of the shaft portion and independent of a nut used in connection with the fastener. The means for securing the head portion to the substrate may include restraining caps, channel and pin combinations, spring-loaded wedges, malleable staples, nestable wedges, and other components that are configured to secure the head portion of the fastener to the substrate (and to prevent unwanted rotation and loosening of the fastener from the substrate).

Abstract: Door hinges are disclosed that are configured to allow operators to hold a door in an open position at specific and desired angles (and for such specific and desired angles to be easily and quickly modulated by an operator). In addition, the door hinges are configured to allow an operator to easily and quickly establish a maximum angle by which the hinge—and its attached door—are allowed to be opened, i.e., how wide the hinge and door are allowed to open (which also may be easily and quickly modulated by an operator).

Abstract: Door hinges are disclosed that are configured to allow operators to hold a door in an open position at specific and desired angles (and for such specific and desired angles to be easily and quickly modulated by an operator). In addition, the door hinges are configured to allow an operator to easily and quickly establish a maximum angle by which the hinge—and its attached door—are allowed to be opened, i.e., how wide the hinge and door are allowed to open (which also may be easily and quickly modulated by an operator).

Abstract: A male fastener, female fastener, and a plunger that is adapted to secure the female fastener to the male fastener, and to prevent unwanted loosening of the female fastener from the male fastener. The male fastener includes a shaft that may optionally include a plurality of protruding elements that extend outwardly from an external surface of the shaft. The protruding elements may be radially positioned in rows around a circumference of the shaft, to create a channel between the rows of protruding elements. The channel is adapted to receive a corresponding thread located within an aperture of the female fastener. The plunger is adapted to be inserted into a trench located between a set of protruding elements (or into multiple trenches located between multiple protruding elements). The plunger prevents the female fastener from rotating around the shaft in a direction towards the bottom portion of the male fastener.

Abstract: A male fastener, female fastener, and a plunger that is adapted to secure the female fastener to the male fastener, and to prevent unwanted loosening of the female fastener from the male fastener. The male fastener includes a shaft that may optionally include a plurality of protruding elements that extend outwardly from an external surface of the shaft. The protruding elements may be radially positioned in rows around a circumference of the shaft, to create a channel between the rows of protruding elements. The channel is adapted to receive a corresponding thread located within an aperture of the female fastener. The plunger is adapted to be inserted into a trench located between a set of protruding elements (or into multiple trenches located between multiple protruding elements). The plunger prevents the female fastener from rotating around the shaft in a direction towards the bottom portion of the male fastener.

Abstract: A male fastener, female fastener, and a wedge that is adapted to secure the female fastener to the male fastener, and to prevent unwanted loosening of the female fastener from the male fastener. The male fastener includes a shaft that may optionally include a plurality of protruding elements that extend outwardly from an external surface of the shaft. The protruding elements may be radially positioned in rows around a circumference of the shaft, to create a channel between the rows of protruding elements. The channel is adapted to receive a corresponding thread located within an aperture of the female fastener. The wedge is adapted to be inserted into a space located between a set of protruding elements (or into multiple spaces located between multiple protruding elements). The wedge prevents the female fastener from rotating around the shaft in a direction towards the bottom portion of the male fastener.