Grease gun for a motor drive

US6675992B2 · kind B2 · utility

Inventor

• Axel Schumann · Bornheim, DE

Key dates

• Filing date: Apr 1, 2002
• Grant date: Jan 13, 2004
• Expiry date: Jul 6, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16N11/08
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A grease gun for lubricating machines, includes a housing having an inlet opening for receiving grease therethrough into the housing and an extrusion opening through which the grease is pushed out to a machine to be lubricated; a drive shaft rotatably mounted in the housing and having an outer surface with external threads thereon; a conveying piston mounted in the housing and partially surrounding the drive shaft, the conveying piston having internal threads for engaging with the threads on the drive shaft; a reversible drive motor rotating the drive shaft so as to cause the piston to move toward and away from the extrusion opening; and a seal associated with the conveying piston for sealing the inlet opening when the piston is moved toward the extrusion opening.