Abstract: An energy efficient tricycle has a frame, fork and handlebars connected to hold a front wheel and two rear wheels. A power and transmission assembly means is mounted on the frame to provide power to both rear wheels. A pair of pedals are independently operable and used to provide the torque needed to propel the tricycle. A motorized embodiment is also provided to provide additional power when needed or to completely motorize the tricycle. The pedals are mounted so that they travel in a vertical path. The handlebars, front wheel and both rear wheels are foldable to allow the tricycle to fit within a vehicle. The tricycle has a very low center of gravity. A seat is provided in one embodiment to allow a user to sit and operate using a motor.

Abstract: An energy efficient tricycle has a frame, fork and handlebars connected to hold a front wheel and two rear wheels. A power and transmission assembly means is mounted on the frame to provide power to both rear wheels. A pair of pedals are independently operable and used to provide the torque needed to propel the tricycle. A motorized embodiment is also provided to provide additional power when needed or to completely motorize the tricycle. The pedals are mounted so that they travel in a vertical path. The handlebars, front wheel and both rear wheels are foldable to allow the tricycle to fit within a vehicle. The tricycle has a very low center of gravity. A seat is provided in one embodiment to allow a user to sit and operate using a motor.

Abstract: An apparatus for abrading a workpiece comprises a first plate assembly having a first surface for supporting a workpiece and a second plate assembly having a second surface for engaging the workpiece to abrade a portion thereof. A displacement shaft is mounted for movement with respect to the upper and lower plate assemblies and has a first end configured to engage the upper plate assembly. A feedback assembly is coupled to the displacement shaft for moving the displacement shaft to substantially maintain a predetermined load exerted on the displacement shaft by the upper plate assembly.

Abstract: Methods and apparatus are provided for abrading a work piece. The apparatus has two support members to which a carriage member is slidably mounted. A vertical drive mechanism moves the carriage member in a vertical direction. A spindle is supported by the carriage member, has a longitudinal channel, and is configured to rotate about a central axis. The apparatus also has an upper abrading wheel having a first working surface and a lower abrading wheel having a second working surface. The second working surface is parallel to and in vertical opposition to the first working surface. The upper abrading wheel comprises a plurality of conduits, each having a first orifice and a second orifice. The first orifices of the conduits are disposed at the first working surface and the second orifices are in fluid communication with the longitudinal channel of the spindle.

Abstract: An apparatus for abrading a workpiece comprises a first plate assembly having a first surface for supporting a workpiece and a second plate assembly having a second surface for engaging the workpiece to abrade a portion thereof. A displacement shaft is mounted for movement with respect to the upper and lower plate assemblies and has a first end configured to engage the upper plate assembly. A feedback assembly is coupled to the displacement shaft for moving the displacement shaft to substantially maintain a predetermined load exerted on the displacement shaft by the upper plate assembly.