Abstract: The system is adapted for use with a portable dental delivery system and provides a selector for activating one of two handpieces. When one of the handpieces is to be activated, the supporting base is lifted from its wheels by a pneumatic support assembly that is controlled by the same valve system.

Abstract: The present invention provides a brake that allows an object to rotate continually through its full range of movement, but allows the object to be reliably secured at any position within this range. The object is carried by a brake that includes a deformable cylindrical collar and a lever. Normally, a spring exerts force against the lever, which in turn exerts pressure on the collar, causing the interior diameter of the collar to become smaller. The collar then grasps the rod and prevents the rotation of the brake relative to the rod. A pneumatically controlled piston counters the force of the spring to allow the brake to rotate freely.

Abstract: Control system for multiple handpieces and associated devices includes a plurality of module control blocks secured in an assembly with a manifold that receives and distributes fluids to the blocks. Blocks contain cartridge valves, each removable through a single face of the control blocks for ease of access. The control blocks are adapted for attachment of auxiliary control devices. Flow control devices in the blocks are controlled by lifting of handpieces from hangers and/or by foot operated controls.

Abstract: A dental apparatus is provided which includes a handle having a hollow interior and an end portion which is slightly curved to facilitate insertion in the oral cavity of a dental patient. Within the hollow interior, an air heater system is provided consisting of an air vortex tube. Air is delivered to one end of the vortex tube in a direction perpendicular to the longitudinal axis of the tube causing the air to rapidly spin within the tube. The spinning air impinges upon an air flow control member at the opposite end of the tube which causes a portion of the air to deflect rearward toward its point of entry. This air is cool in temperature, and expelled from the rear of the tube. The non-deflected air is warm and directed out of the curved end portion of the handle. The invention further includes an adjustment system to control the temperature of air leaving the vortex tube.