Dental paralleling handpiece

Claim 1

FOR USE WHEN DRILLING PARALLEL HOLES IN TEETH FOR INSERTION OF PIN-LEDGE ATTACHMENTS FOR FIXING BRIDGEWORK OR DRILLING PARALLEL GROOVES FOR INSERTION OF OTHER FIXED BRIDGEWORK ABUTMENTS INCLUDING THREE-QUARTER CROWNS; A PARALLELING HANDPIECE COMPRISING: IN COMBINATION, AN ELONGATED HOUSING HAVING A LEADING END TERMINATING IN A DRILL HEAD RIGIDLY SUPPORTED FROM SAID HOUSING AND EQUIPPED WITH A POWER DRIVEN DRILL OPERATING AT RIGHT ANGLES TO THE LENGTHWISE DIMENSION OF SAID HEAD, A COMPLEMENTAL ELONGATED PARALLELING GUAGE HAVING A TERMINAL END PORTION CONSTITUTING A GUIDE AND WHOSE LONGITUDINAL AXIS IS PARALLEL TO THE CORRESPONDING AXIS OF SAID DRILL, A PAIR OF GUIDES RIGIDLY SUPPORTED ON DIAMETRICALLY OPPOSITE SIDES OF SAID HEAD, AN ELONGATED EXTENSIBLE AND RETRACTIBLE CARRIER INCLUDING RIGID PARALLEL LONGITUDINAL LIMBS HAVING FREE REARWARDLY PROJECTING END PORTIONS STRADDLING SAID HEAD AND LONGITUDINALLY SLIDINGLY, GUIDINGLY, ADJUSTABLY AND RETENTIVELY SUPPORTED FROM SAID GUIDES AGAINST ANGULAR DISPLACEMENT AND FOR LONGITUDINAL ADJUSTMENT OF SAID CARRIER RELATIVE TO SAID HEAD, THE FORWARD ENDS OF SAID LIMBS BEING RIDIGLY INTERCONNECTED BY A BIGHT PORTION EXTENDING THEREBETWEEN FORWARD OF THE LEADING END OF SAID HEAD AND FROM WHICH SAID PARALLELING GAUGE IS SUPPORTED.