Abstract: A mechanical advantage device includes a base, a beam pivotably connected to the base at a fulcrum between a first end of the beam and a second end of the beam, a seat at the first end of the beam, and a load at the second end of the beam. In some embodiments, the mechanical advantage device includes structure, such as a linkage, for effecting oscillation of the beam by shifting weight along the beam. The mechanical advantage device may be a single-person seesaw.

Abstract: An opposed jumping platform apparatus includes a fulcrum base; and an opposed platforms member having an opposed platforms member center pivotally mounted on the fulcrum base and dividing the opposed platforms member into a first jumping platform and an opposing second jumping platform, the first jumping platform having a first user support spaced from the opposed platforms member center extending at least one and one half feet above said first jumping platform, and the second jumping platform having a second user support spaced from the opposed platforms member center extending at least one and one half feet above said second jumping platform.

Abstract: A merry-go-round includes: a body where the body includes an upper tubular sleeve, an upper beam with a set of chair braces at each end on top of the body, a set of horizontal supports between the body and the set of chair braces; a base including a lower tubular sleeve, a plurality of legs and a plurality of feet; a base support bar connected to the plurality of legs beneath the base; a rotating bar with an upper portion and a lower portion. The merry-go-round also includes a set of chairs; a propelling mechanism; a propelling bar fastened to the rotating bar at an end and attached to the lower connection points at an opposing end, wherein the propelling mechanism enables the merry-go-round to turn when the rider pushes and pulls the handles and thrusts and relaxes against the foot bar.

Abstract: Play equipment that combines the movements of a teeter totter and a merry-go-round includes a support for suspending a riding assembly, a riding assembly upon which a rider is supported, such as upon which a rider sits or a rider hangs from, and a suspending means which suspends the riding assembly from the support for both rotational movement with respect to the support and up and down movement with respect to the support. The up and down movement may be achieved by pivotal movement or by swinging movement. The support of the invention may be adjustable to adjust the height of the riding assembly. When seats for the riders are provided, the seats may include restraining means, such as back and side rails to help keep the rider in the seat. The equipment can include a single beam providing a pair of oppositely extending arms as with a traditional teeter tooter, or can include additional beams or arms, such as four arms, to accommodate additional riders.

Abstract: A rotary and rocking toy device has four bottom seats, four roller wheels, four support frames, and four carriers. The support frames are connected together to form a cross shape. Each roller wheel is disposed on the respective bottom seat. Each support frame is connected to the respective roller wheel pivotally. Each carrier is connected to the respective support frame stably.

Abstract: A rotating riding toy for children has adjustability in the linkage which causes the riding toy to rotate. It has been found that such adjustability can affect the ease of pumping or driving the riding toy rotationally as well as the rotational speed obtained. In addition, the seats are positionally adjustable to accommodate smaller and larger children. Quick release pins are envisioned for removing stabilizing legs from a base member to afford breakdown of the mechanism and portability.