Movable support for dental chairs

Claim 1

A SUPPORT FOR DENTIAL CHAIRS COMPRISING A FLAT PLATE ADAPTED TO SUPPORT THE BASE OF A DENTAL CHAIR THEREON, A PLURALITY OF ROLLERS MOUNTED ON THE UNDERSIDE OF SAID PLATE AND SUPPORTING SAID PLATE FOR MOVEMENT OVER A FLOOR SURFACE, TRACK MEANS ADAPTED TO BE SECURED UPON A FLOOR SURFACE FOR GUIDING MOVEMENT OF SAID PLATE THEREALONG, SAID TRACK MEANS INCLUDING A RAIL HAVING AN UPSTANDING LONGITUDINAL RIB PROVIDING PARALLEL LATERAL SURFACES ALONG OPPOSITE LONGITUDINAL LSIDES THEREOF, A HORIZONTAL CLAMPING MEMBER DISPOSED BENEATH SAID PLATE AND EQUIPPED WITH A PAIR OF CLAMPING JAWS POSITIONED ON OPPOSITE SIDES OF SAID RIB, SAID CLAMPING MEMBER BEING PIVOTALLY MOUNTED TO SAID PLATE FOR HORIZONTAL PIVOTAL MOVEMENT ABOUT A VERTICAL PIVOT AXIS DISPOSED BETWEEN SAID JAWS AND PASSING THROUGH SAID RIB, THE HORIZONTAL DISTANCE BETWEEN SAID JAWS BEING SLIGHTLY GREATER THAN THE WIDTH OF SAID RIB FOR UNRESTRAINED HORIZONTAL MOVEMENT OF SAID PLATE ALONG SAID RAIL WHEN SAID MEMBER IS PIVOTED INTO AN UNLOCKING POSITION, SAID JAWS BEING ENGAGEABLE WITH THE LATERAL SURFACES ALONG OPPOSITE SIDES OF SAID RIB WHEN SAID MEMBER IS PIVOTED INTO A LOCKING POSITION, AND PEDAL MEAN PROVIDED BY SAID PLATE AND OPERATIVELY ASSOCIATED WITH SAID MEMBER FOR PIVOTING SAID MEMBER HORIZONTALLY BETWEEN LOCKING AND UNLOCKING POSITIONS.