Knowra Jack-in-the-box Jack-in-the-box A toy in which turning a crank plays a tune and releases a spring-loaded figure through the lid. Its sudden appearance combines mechanical action with surprise.
Torsion spring : A spring that stores energy by twisting around its axis. Many jack-in-the-boxes use a coiled torsion spring to propel the hidden figure upward.
Automaton : A self-operating mechanical figure or device, often designed to imitate life. Jack-in-the-box belongs to a long tradition of mechanisms that animate figures.
Children's toy : An object designed primarily for play by children. The jack-in-the-box is chiefly made and understood as a children's toy.
Puppet : A figure manipulated to perform through direct handling, strings, rods, or other controls. Unlike most puppets, the jack-in-the-box animates its figure with a concealed spring.
Cam : A rotating machine element that converts rotation into a prescribed motion. A cam can coordinate the crank, music, and lid latch during a cycle.
European automata : Mechanical figures and devices made in Europe, especially from the Renaissance onward. Automata established the craft tradition behind concealed, mechanically animated figures.
Practical joke : A joke that surprises or temporarily deceives someone through an action or prop. The toy’s sudden pop-out has made its mechanism a model for surprise gags.
Pop-up book : A book whose pages contain folded structures that rise into three-dimensional forms. Both create a surprise emergence, but a pop-up book uses paper structures rather than a spring-driven toy.
Latch : A mechanical catch that holds a movable part in place until released. The latch keeps the spring-loaded figure inside until the release point.
Tin toy : A toy made wholly or partly from formed tinplate, often with a mechanical action. Tinplate manufacturing helped turn spring-driven toys into affordable commercial products.
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