Patent ID: 8251182

Claim:
An automatic lubricant dispenser comprising: a housing for receiving lubricant inside the housing, the housing including a closed first end and a second end having a through hole; a piston received reciprocally in the housing and having a central opening formed there-through; a spring installed at the second end side of the housing, for compressing the piston in a first direction; a flow pipe installed in a longitudinal direction of the housing, the flow pipe having a first end portion affixed to the first end of the housing and a second end portion extending through the central opening of the piston with the flow pipe slidably engaging in the central opening of the piston, the second end portion further extending through the through hole of the housing; and a locking pin protruding from the piston in the longitudinal direction of the housing, and a locking hole formed at the second end of the lubricant housing to allow the locking pin to be locked thereto; wherein the flow pipe includes an inflow hole formed adjacent to the first end portion thereof and an inside hollow channel so that the lubricant compressed by the piston in the first direction by operation of the spring flows into the flow pipe in a second direction opposite to the first direction and is then discharged from the housing through the flow pipe.