A brake assembly for roller skates. The brake assembly operates on two inline wheels which have a brake drum extending outwardly from them. The brake member is pivotally held so that it contacts the brake drums on the two inline wheels. The brake may be activated by a mechanical link attached to a pivoted horseshoe shaped device surrounding the ankle portion of the skate. Alternatively, it may be electrically activated by a potentiometer which may either be moved by the rearward movement of the ...

A process for the preparation of optically pure diastereoisomers of tetrahydrofolate compounds is described, comprising the conversion, for example, of only the 5,6S,7,8-tetrahydrofolic acid component of a racemic mixture of 5,6,7,8-tetrahydrofolic acid to 10-formyl-5,6S,7,8-tetrahydrofolic acid in the presence of a formyl tetrahydrofolate synthetase, followed by cyclizing, hydrolyzing and derivatizing. The process is also useful to make a desired substantially pure (6R or 6S) enantiomer of a de...

An in-line skate and wheel particularly useful on a skating surface made of ice are provided. The in-line skate of the present invention includes a series of wheels aligned in a single row. The wheel of the present invention includes a circular body with a concave contact surface formed around the outer circumference of the circular body such that the concave contact surface and the wheel body form a pair of skating edges which engage the ice surface during skating. The wheels can be removed fro...

A sled is provided which includes a composition configured for use in the sled. The composition includes a polypropylene copolymer having an IZOD impact resistance from about 0.1 ft lb/in to about 30.0 ft lb/in.

A skateboard includes a deck with two trucks connected to an underside of the deck and each truck has a case with two axles so that two rollers are rotatably connected to the two axles. Two protection members are connected to the two cases respectively and at least one cushion member is connected between respective one of the protection members and respective one of the cases. A rolling shaft is connected each of the two protection members and includes a mediate section which extends out from an...

An off road sports board provides a rider with the experience of snowboarding on dirt, gravel or other particulate materials when and where snow is not present, the sports board having an overall elongated oval configured deck having an upper surface having front and rear bindings within which the rider stands and a lower surface attaching a lower mounting plate from which extends a front fixed wheel assembly having a first lateral contoured wheel, an adjustable middle wheel assembly having a se...

A skateboard for use on pavement, ice or snow using a single narrow-footprint wheel, ice-blade or ski-runner attached to each foot, thus requiring the rider to dynamically balance the board. The skateboard is capable of self-propulsion at considerable speed on the flat or uphill by using an undulating motion. It can also lean up to 30 degrees and has a steering circle of only two feet. The board's construction comprises a front footboard, a rear footboard, and a strut which connects the two foot...

A lean-induced steerable wheel assembly has a pair of parallel wheel hub carriers arranged on either side of a leanable chassis spine. A linkage connects the wheel hub carriers to the chassis spine so that the wheels lean in unison with the chassis spine. A steering mechanism couples the wheel hub carriers to the chassis spine so that an induced lean on the chassis spine steers the wheel hub carriers through a steering angle dependent on the angle of induced lean.

A process for removing sulfone from a liquid hydrocarbon containing a concentration of sulfone by mixing a liquid acid therewith and thereafter separating the resulting admixture into an acid phase and a hydrocarbon phase. The hydrocarbon phase has a concentration of sulfone less than such concentration in the liquid hydrocarbon.

A sliding exercise apparatus used as a recreational device. The device includes a sport board housed within a carrying case. The carrying case has at least a low friction and board protective bottom surface to facilitate sliding the apparatus upon a suitable contact area. The top of the carrying case is provided with removable portions that would enable the user to access the sports board while the board is housed within its carrying case. A user can be supported by the board while in its case a...