Patent ID: 6523645
Filing Date: 2003-02-25
Classification: B27B,F16N,Y10T

Abstract:
Pumping device (1) in connection with saw chain lubrication, in connection with a hand-held chain saw, said pumping device (1) including a pumping house (7), a piston (9) that is received in the pumping house (7) and means (3, 10, 11, 12) to bring the piston (9) to rotate and simultaneously perform a reciprocating motion in its longitudinal direction, said means including on one hand a worm pinion (3) having means (25) for driving cooperation with a prime mover (15, 19) and on the other hand a gear pinion (10) mounted on the piston (9), characterized in that said worm pinion (3) on one hand includes a spirally shaped element (28) that is prefabricated as a separate detail and intended to cooperate with the gear pinion (10), and on the other hand a sleeve shaped element (18) that supports the spirally shaped element (28), and that the spirally shaped element (28) is manufactured from a metal, and that the sleeve shaped element (18) and the teeth of the pinion (10) are manufactured from a polymer material, and that the sleeve shaped element constitutes a bearing sleeve (18) having a spirally shaped groove (26) on an outer side that receives the spirally shaped element (28).