Injection needle removing apparatus for dental cartridge syringe

Abstract

There is provided an injection needle removing apparatus for dental cartridge syringe comprising a chuck device ( 22 ) mounted within a housing ( 11 ) and including chuck jaws ( 26 ) for gripping a needle hub ( 25′ ), means for opening and closing the chuck jaws, a needle receptacle ( 14 ) adapted to rotatably support the housing ( 11 ), and means ( 50, 55, 56 ) for rotating the housing relative to the receptacle, the rotation of the housing causing the chuck device, together with the housing, to be rotated relative to the injection needle, thereby removing the injection needle from the syringe. In this arrangement, any rotative power transmission mechanism is not required to rotate the chuck device itself relative to the syringe.

1 . An injection needle removing apparatus for dental cartridge syringe comprising a housing including a cover with an circular opening for insertion of an injection needle attached to a syringe and a support having a passage in alignment with the circular opening, a chuck device including chuck jaws mounted on the support of the housing and arranged to grip the needle hub from three ways, means for opening and closing the chuck jaws when the injection needle is inserted in the circular opening, a needle receptacle adapted to rotatably support the housing, and means for rotating the housing relative to the receptacle, the rotation of the housing causing the chuck device, together with the housing, to be rotated relative to the injection needle, thereby removing the injection needle from the syringe so that the removed injection needle can fall through the passage into the receptacle.  
   
   
       2 . The injection needle removing apparatus for dental cartridge syringe according to  claim 1  wherein each of the chuck jaws is rotatably mounted on a support pin secured to the support of the housing, and the chuck device includes a turning support plate mounted on support pins through slots for turning the chuck jaws around the support pins to open and close the chuck jaws, and a solenoid device actuated to turn the turning support plate a predetermined angle.  
   
   
       3 . The injection needle removing apparatus for dental cartridge syringe according to  claim 1  wherein the means for rotating the housing relative to the receptacle includes a reduction geared motor fixed to the housing, a spur gear fixed to an output shaft of the motor, and a ring gear on the receptacle, the spur gear meshing with the ring gear to rotate the housing relative to the receptacle when the housing is connected to the receptacle.