| 摘要 |
A grease gun device includes a cock body having a piston cylinder and a slot joint. The piston cylinder also includes a seal washer opening and an outlet opening spatially disposed from the seal washer opening. A piston is reciprocatingly engaged in the piston cylinder for moving grease from the slot joint to the outlet opening, wherein a valve mechanism selectively allows grease from the piston cylinder to pass through the outlet opening. A grease supply barrel having a grease opening is engaged with the cock body to supply grease to the piston cylinder, and a sealed piston closes the other end of the grease supply barrel. A jacket is mounted about the grease barrel and connected with the cock body, wherein the diameter of an outermost periphery of the grease barrel is less than an inside diameter of the jacket, such that the grease barrel does not overlap the jacket. A rear cover engages the far end of the jacket. In use, moving the piston in a first direction in the piston cylinder pushes grease through the outlet opening, and moving the piston in a second direction in the piston cylinder induces a vacuum pressure in the piston cylinder, which moves grease from the grease barrel, through the slot joint, and into the piston cylinder. A seal washer disposed in the seal washer opening sealingly engages the piston and helps maintain the vacuum pressure in the piston cylinder.
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