Patent ID: 8480017
Filing Date: 2013-07-09
Classification: A47J

Abstract:
1. A grinder, comprising: a transmission shaft; a base, having a grinding chamber for accommodating said transmission shaft, the bottom side of said grinding chamber is formed with open spaces; a grinding unit, including a grinding wheel and a grinding base, said grinding wheel being detachably installed and linked with said transmission shaft, said grinding base being fastened at the bottom side of a receptacle, wherein said grinding wheel penetrating said grinding base thereby forming a gap therebetween; the receptacle, being hollow and installed on said base having its bottom opening detachably installed at the bottom side of said receptacle through an annular coupling flange; and an automatic open/close control device, including: a follower member, installed at the bottom side of said base, an axle holder formed at the center of said follower member allowing said transmission shaft to be connected, said axel holder being adjacent to the circular outer bottom wall and staggeringly installed with at least a stop block and at least a guide slot, the bottom side of said axel holder is formed with a bottom spring hole allowing a torsion spring to be received and positioned, a fasten cover being provided for sealing the opening of said bottom spring hole, two ends of said torsion spring being respectively fixed in said bottom spring hole and said fasten cover, the central bottom of said fasten cover being protrudingly installed with an inserting rod and longitudinally extended with a combination part; a housing, serving to house said base, said follower member and the lower portion of said receptacle, a limit mechanism being installed between the inner bottom wall of said housing and said follower member, and additionally formed with a flange allowing said follower member to be provided; and a bottom cover, respectively formed with an inserting hole and outlets corresponding to said inserting rod and said guide slots, an engaging button being combined with said combination part, thereby enabling said bottom cover to be detachably installed at the bottom opening of said housing; wherein, when rotating said housing, said bottom cover, said follower member, said transmission shaft and said grinding wheel being driven to synchronously rotate; the friction generated when said grinding wheel and said grinding base grinding the loaded material being greater than the torque of said torsion spring, through the limit function provided by said limit mechanism, said follower member, relative to said housing, enabling said limit mechanism to move from a first end to a second end, so said torsion spring being in an energy storing state, and said outlets being automatically opened relative to said guide slots due to the displacement of said stop blocks.