Patent ID: 8668051

Claim:
A lubricating device mounted on a linear transmission mechanism comprising a guide member and a movable member, said guide member being magnetically conductive and comprising at least one mounting hole for mounting, said movable member being movable along said guide member, the lubricating device comprising: a housing connected to said movable member of said linear transmission mechanism and movable with said movable member, said housing defining an axial direction and a radial direction, said housing comprising an accommodation chamber and an opening extending along said axial direction and respectively formed on the inside and periphery thereof in equal cross section, and a lubricant dispensing hole disposed in communication with said accommodation chamber; a screw rod mounted in said accommodation chamber along said axial direction, said screw rod comprising a first end piece located on one end thereof and pivotally coupled to said housing, a second end piece located on an opposite end thereof, and a first transmission portion formed of a part of the periphery of said second end piece; a pressure member fitting said opening in shape and mounted in said accommodation chamber and movable along said axial direction, said pressure member comprising a through hole for the passing of said second end piece of said screw rod, said pressure member defining with said housing a lubricant storage chamber in said accommodation chamber, said lubricant storage chamber being kept in communication with said lubricant dispensing hole, the volume of said lubricant storage chamber being relatively changed subject to movement of said pressure member in said accommodation chamber; a screw nut threaded onto said screw rod and driven by said screw rod to stop against said pressure member outside said lubricant storage chamber; a transmission member is located in said accommodation chamber outside said lubricant storage chamber and movable back and forth along said radial direction, said transmission member comprising a transmission slot, a second transmission portion disposed in said transmission slot at one lateral side and a third transmission portion disposed in said transmission slot at the opposite lateral side, said second transmission portion and said third transmission portion being respectively disposed at two opposing sides relative to said first transmission portion of said screw rod and alternatively driven to rotate said first transmission portion in forcing said screw nut against said pressure member; and a driving device connected to said transmission member and adapted for reciprocating said transmission member.