Abstract: A machine powered by forces exerted by the machine user on machine driving members, such as pedals, which drive a rotary driven member through a unique variable ratio drive system. The machine may be constructed and arranged for use as either a vehicular conveyance for the machine, user or a stationary exercise machine both of which operate in a manner that provides an effective therapeutic exercise for certain orthopedic problems, particularly spine and leg problems. A drive system for the machine and other uses.

Abstract: A driving tool having a tiltable head lockable into a plurality of positions for imparting rotating motion to an output device as the result of squeezing two handle members.

Abstract: A cab for a medium-sized farm tractor includes a body portion that is pivotally attached to the chassis of the tractor for pivotal motion between a raised and lowered position. Preferably, the cab is a monocoque structure and is pivotally attached to the tractor at a forward end of the cab so that it pivots about its forward end. The cab and mounting brackets mounting the cab to the tractor are integrated to form a cantilever requiring no other support. The weight of the cab is used to keep the cab in the lowered position and the attachment between the cab and the chassis includes a counterbalance spring that relieves some of the weight of the cab to assist in raising the cab to its raised position. The cab includes a ventilation system that draws air from outside the cab into the interior of the cab. A filter is interposed in the path of the air as it enters the cab to filter out any toxic chemicals and particulate matter from the air.

Abstract: A spinal implant prosthetic insert for implantation into a void in the spinal column in place of a diseased or injured vertebra that has been removed. The insert maintains the height of the anterior spinal column, thus preventing deformity from occurring. The prosthesis insert is implanted into the spinal column after the anterior vertebral body has been removed. The insert is rigidly fixed in place with bone screws that will screw into the adjacent upper and lower vertebrae after the insert has been positioned in place, through the operation of a drive that is accessible after the insert has been implanted into place. The insert is contoured so that no substantial part of it protrudes outside of the margins of the anterior vertebral column, making it usable as an implant even in the lumbar region where protrusions from the spinal column cannot be tolerated.