An adjustable diameter mechanism includes a plurality of cylinder portions, each of the cylinder portions comprising an arcuate portion of a cylinder and extending along an arc of less than or about 120 degrees of a 360 degree circle and having an inner side and an outer side. The inner side of the cylinder portions are coupled to first ends of a scissors mechanism at a pivot point and a slot of the cylinder portions, the scissors mechanism having a first and a second piece pivotally coupled at a pivot coupling, respective second ends of the scissors mechanism coupled to a respective pair of threaded bolts engaged with a screw having opposing threads meeting at a central point thereof.

A distal end side link hub is coupled to a proximal end side link hub via three or more link mechanisms. Each link mechanism has a proximal side end link member, a distal side end link member, and an intermediate link member. The proximal side end link member has a bent portion and rotation shaft mounting portions. A rotation shaft is mounted to the rotation shaft mounting portion. A bevel gear, forming a part of a gear mechanism for transmitting rotary motion of a posture control actuator to the proximal side end link member, is mounted on the rotation shaft mounting portion and disposed in a space between two virtual planes obtained by extending a radially inner edge and a radially outer edge of one end of the bent portion in a longitudinal direction of the rotation shaft mounting portion.

A distal end side link hub is coupled to a proximal end side link hub via three or more link mechanisms. Each link mechanism has a proximal side end link member, a distal side end link member, and an intermediate link member. The proximal side end link member has a bent portion and rotation shaft mounting portions. A rotation shaft is mounted to the rotation shaft mounting portion. A bevel gear, forming a part of a gear mechanism for transmitting rotary motion of a posture control actuator to the proximal side end link member, is mounted on the rotation shaft mounting portion and disposed in a space between two virtual planes obtained by extending a radially inner edge and a radially outer edge of one end of the bent portion in a longitudinal direction of the rotation shaft mounting portion.

A device which converts two dimensional or three dimensional oscillations into rotary shaft power by way of compressible linkage modules equipped with a one way clutch at one node of each linkage. A drive shaft attached to each linkage which in turn is attached to a main drive shaft rotates when the linkage module experiences oscillations causing the drive shaft attached to each linkage to rotate which causes the main drive shaft to rotate resulting in rotary shaft power.

The present disclosure is concerned with a motion converter structured for converting a rotational motion provided by a motor shaft into a linear reciprocating motion of a drive shaft. The motion converter has a deformable unit, a mounting unit connected with the deformable unit, a coupling unit connected with the deformable unit, the coupling unit being structured to receive the drive shaft or the coupling unit comprising the drive shaft, a connector unit connected with the deformable unit, the connector unit comprising at least a first essentially U-shaped receiver being structured for receiving a first eccentric shaft element of the motor shaft and having a U-base and two U-legs together defining a first elongated hole having a length, a width and a height, and a first bracing element that connects the two U-legs of the first essentially U-shaped receiver on their free ends such that access into the first elongated hole across the width and the height of the first elongated hole is provided, preferably where the first bracing element is bar-shaped or U-shaped or O-shaped, and where the length is measured from an inner surface of the U-base to the free ends of the U-legs.

A drive apparatus of a chair assembly for a 4D theater according to the present disclosure includes: a lower plate which is in contact with the ground; an upper plate which is positioned above the lower plate so as to be spaced apart from the lower plate; a first actuator which is positioned at a left portion between the lower plate and the upper plate; a second actuator which is positioned at a right portion between the lower plate and the upper plate; and a spline device, in which the spline device is installed to be positioned on a vertical centerline of the lower plate, and the first actuator is installed to have a predetermined first angle with respect to a horizontal centerline of the lower plate.

A drive apparatus of a chair assembly for a 4D theater according to the present disclosure includes: a lower plate which is in contact with the ground; an upper plate which is positioned above the lower plate so as to be spaced apart from the lower plate; a first actuator which is positioned at a left portion between the lower plate and the upper plate; a second actuator which is positioned at a right portion between the lower plate and the upper plate; and a spline device, in which the spline device is installed to be positioned on a vertical centerline of the lower plate, and the first actuator is installed to have a predetermined first angle with respect to a horizontal centerline of the lower plate.

An electrically powered drive system for a medical device includes a motor, a gear box driven by the motor, a driving member for moving a part of the device, a crank mechanism, and a push-pull mechanism. The crank mechanism includes first and second crank arms each having a connection end and a distal end. The first crank arm's distal end is pivotally connected to the driving member. The second crank arm's connection end is pivotally connected to the first crank arm's connection end. The second crank arm's distal end is pivotally connected to a stationary member. The push-pull mechanism is connected to and driven by an output member of the gear box to drive the crank mechanism to move the driving member between a retracted position and an extended position.

An electrically powered drive system for a medical device includes a motor, a gear box driven by the motor, a driving member for moving a part of the device, a crank mechanism, and a push-pull mechanism. The crank mechanism includes first and second crank arms each having a connection end and a distal end. The first crank arm's distal end is pivotally connected to the driving member. The second crank arm's connection end is pivotally connected to the first crank arm's connection end. The second crank arm's distal end is pivotally connected to a stationary member. The push-pull mechanism is connected to and driven by an output member of the gear box to drive the crank mechanism to move the driving member between a retracted position and an extended position.

A decoy collapsible base and frame that floats just below the surface of a body of water. A plurality of fowl shaped bodies defining duck decoys that float are detachably connected to the frame by tether lines. The tether lines are connected to a cam and a tether anchor moveably mounted on the frame. Rotation of the pitman connecting to the tether lines pivots opposing duck decoys resulting in a dunking motion of selectively positioned duck decoys