Other

William Loran

Merritt A Robinson

Apparatus for machining a human tooth includes a rotary cutter that is moved along a predetermined path dictated by motor energizing signals. The cutter is moved vertically by one drive, laterally by another drive and in or out by a third drive. The apparatus is clamped selectively to the patient's jaw or to a model thereof. The dentist's manual work is actually done on a model, with the apparatus being secured to the model in a fixed position. The vertical drive, the lateral drive, and the in or out drive are energized in response to the dentist's manipulation of a joy stick to move the cutter along paths necessary to achieve the desired tooth configuration. A second joy stick is manipulated to vary the attitude of the cutter, about roll and/or pitch axes. Signals proportionate to the extent of each drive operator are delivered to a computer in the sequence and for the period during which the drives are activated. When the machining is completed on the model, the restoration is prepared from the model, and the patient is then called back. The device is then secured to the patient's jaw so that it is in precisely the same relative position as on the model. Then, the computer delivers drive motors machine strokes in the proper sequence to duplicate the machining previously done on the model.

Apparatus for indirect dental machining

The disclosure is of a rotary internal combustion engine constructed in three sections, a compressor section, a combustion section and an expander section. Each of the compressor and expander sections includes male and female rotors with complementary, single turn lobe and groove in which gas, e.g. first an air-fuel mixture and then the combusted mixture, traverse the section. In a lubrication system, a shaft rotates in a cylindrical lubrication gallery. Oil is carried along a helical groove around and along the shaft to small passageways that carry the oil to the rotors of the compressor and expander sections.

Interengaging rotor device with lubrication means

The disclosure is of an axial flow rotary internal combustion engine constructed in three sections, a compressor section, a combustion section and an expander section. The compressor section includes male and female rotors with complementary, single turn lobe and groove in which an air-fuel mixture is compressed and discharged from a port at the end of the groove as the port overtakes and traverses an arcuate intake port in the cylindrical combustion block, which is rotating at a slower speed. After the intake port is traversed and sealed off, an ignition port in the combustion chamber exposes a spark plug and the mixture is ignited. Substantially complete combustion takes place while the combustion chamber is sealed off and isolated. Then an entry port into the helical groove of female expander rotor overtakes and traverses an arcuate combustion chamber exhaust port and the combusted gases are discharged and expanded into the expander section. The expander section comprises a pair of complementary male and female rotors with complementary helical groove and lobe and are of a larger volume than the compressor rotors to enable full expansion. Power is taken off a shaft of one of the expander rotors.

Growing community of inventors

San Rafael, CA, United States of America

William Loran