Pin joint for eccentric worm pumps
AssigneeNetzsch-Mohnopumpen GmbH
InventorGunther Hantschk
Life of this patent
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Abstract
Two pin joints, each mounted at a respective end of a coupling rod, each comprise an outer joint head including a cavity which is open at least in one axial direction as well as a diametral bore and an inner joint head disposed in the cavity and likewise including a diametral bore. A pin extends through both bores and is locked at the outer joint head by a pin retaining device. To accomplish that, the pin has two ends projecting radially out of the outer joint head and each formed with a notch transversely of the longitudinal direction of the pin. The pin retaining device is embodied by a helical spring supported at its one end in the two notches of the pin and at its other end on a shoulder. The shoulder preferably is formed at a sliding ring seal which seals the outer joint head against a housing member.
Claims4
An eccentric worm pump, comprising
- a drive shaft having an axis or rotation;
- a rotor arranged for rotation about an axis of rotation common to said axis of rotation for said drive shaft;
- a pin joint for connecting said rotor to said drive shaft;
- said pin joint including
- an outer joint head including a cavity which is open at least in one axial direction as well as a first diametral bore,
- an innter joint head disposed in the cavity and including a second diametral bore,
- a pin extending through both first and second diametral bores,
- pin retaining means for locking the pin at the outer joint head,
- a shoulder fixed with respect to said outer joint head,
- the pin having two ends projecting radially out of the outer joint head and each end formed with a notch transversely of the longitudinal direction of the pin, and
- the pin retaining means comprising a helical spring having two spring ends supported at one spring end in the two notches formed in the pin and at the other spring end on the shoulder which is not displaceable in axial direction with respect to the outer joint head.
Dependencies are inferred from the claim text.