In order to reduce the rail height to proportions corresponding to those of original railways while maintaining enough ground clearance, for wheels provided with European wheel flanges (3), a groove (12) running parallel to the longitudinal axis of the rails andhaving a dove-tailed cross-section is formed in the sole surface of each rail foot (11) of both rail sections (1) mounted on sleepers (2). A projection (20) is formed on the upper side of each sleeper (2), corresponding to both rail secti...

A dental articulator includes a pair of attachment members, each adapted to engage a dental casting and a hinge unit including two pivotably interconnected retaining members, each adapted to engage one of the attachment members by means of a joint which may be selectively and reversibly immobilized. The two retaining members are interconnected by a hinge which provides a pair of spaced apart pivot axes for pivoting each of said members and which further provides for the ready and reversible sepa...

An apparatus for model follower control of a robot. The apparatus comprises a source for generating target position data representing a target position for the robot, and an operation pattern generator responsive to the target position data for calculating target angular position data representing target angular positions of the robot for respective control periods. A step input calculating unit calculates step input data based on the target angular position data and the existing robot condition...

A three-dimensional molecular model comprises plastic modules, each representing on atom connected to one another. Modules intended to represent atoms of cyclic compounds are polyhedrons set in the model so that adjacent polyhedrons touch faces and have a common apex. The sum total of the angles formed by the adjacent faces of polyhedrons of the modules is more than 360.degree..

A remotely powered and controlled aircraft is provided of the type wherein the propeller is driven from a remote drive unit by an elongated flexible cable confined within a flexible tube. The aircraft of the invention includes a secondary control knob slidably and rotatably mounted about the flexible tube for selectively controlling the effective length of the tube and cable to thereby control the radius of flight of the aircraft. In a preferred embodiment, the aircraft is a biplane with a uniqu...

A heart model provides a simulative environment for lead implantation and affixation. In one embodiment, removable silicone plugs are provided at appropriate locations so that an inserted lead can be affixed to the plugs with a helical tip. A simulative venous structure is provided that has increased lubricity to facilitate the insertion and manipulation of the lead.

A model track section for model vehicles, which is releasably interengageable in end-to-end connection with a like track section, wherein the section includes a generally flat bed having thereon a pair of longitudinal rails, one end of the bed being cut away in the space between the adjacent rail ends and having resilient backing portions on outer sides of the rail ends, the other bed end having a pair of laterally spaced cutouts or openings on outer sides of the associated rail ends, which latt...

A sectional track construction wherein each section constitutes a generally flat body having at least one longitudinally extending conductor exposed upwardly and provided with end portions each extending beyond the adjacent lateral body portion on one side of the conductor, and an oblique cam at each end of the section for engagement with a like cam of a like section to urge the exposed conductor end portions into side-by-side facing engagement with conductor end portions of a like track section...

A flying toy in the form of a large, lightweight glider and a launcher therefore. In one form, the glider is formed of a lightweight cellular plastic and contains a rigid plastic attachment or insert connected to its body and defining a hook or retainer for the end of a loop of rubber band which is connected to the launcher and is released upon the pulling of a trigger. In a particular form the launcher is composed of an elongated rod shaped guideway containing left and right hand grips located ...

A model track section for model vehicles releasably interengageable in end-to-end connection with a like track section, wherein an end formation is provided having one side facing generally laterally, and resilient means is located obliquely along the laterally facing side for resilient deflection laterally toward the formation upon end-to-end interengagement of like track sections.