Pivot joint in rotating an arm inward). When rotating the forearm, these movements are typically called pronation and supination. In the standard anatomical position, the forearms are supinated, which means that the palms are facing forward, and the thumbs are pointing away from the body. In contrast, a forearm in pronation would have the palm facing backward and the thumb would be closer to the body, pointing medially. Examples of a pivot joint include: In contrast, spherical joints (or ball and socket joints) such as the hip joint permit rotation and all other directional movement, while pivot joints only permit rotation. Pivot
Geared continuous hinge the door’s weight over the entire door length rather than concentrated on two or three spots as with butt or pivot hinges. The gears allowed fluid movement as the door opened and closed. Baer's patent expired in 1985. He sold his company to a national manufacturer in 1989. With the sale, and with other companies beginning to manufacture geared continuous hinges, the market soon went from regional to national. Later the hinges were tested to verify their endurance. In 2004, a geared continuous hinge earned 60 minute Ballistic Resistance and Forced Entry certification from the United States Department of State