Patent ID: 9731431
Date: 2017-08-15
CPC Classifications: B27B

Claim:
1. A drive system for a supply pump of a motor chain saw, wherein the motor chain saw comprises a drive motor; a saw chain; a first sprocket wheel operatively connected to the drive motor; the first sprocket wheel comprising first teeth engaging the saw chain for driving the saw chain; wherein the supply pump supplies the saw chain with chain oil for lubricating the saw chain; a pump drive operatively connected to the supply pump and comprising a first drive wheel and a second drive wheel, wherein the first drive wheel is connected to the supply pump and the second drive wheel is connected to the first sprocket wheel, and wherein the first and second drive wheels are drivingly connected with each other; a rotatingly driven drive element comprising a coupling section, wherein the coupling section in at least one rotary direction of the drive element is drivingly connected with form fit to the first teeth of the first sprocket wheel; the second drive wheel formed on the drive element; the coupling section comprising first followers and the first teeth of the first sprocket wheel project in a radial direction between the first followers; the first sprocket wheel comprising first follower surfaces correlated with the first followers of the coupling section, respectively, wherein in a circumferential direction of the first sprocket wheel in the at least one rotary direction of the drive element a subset of the first follower surfaces of the first sprocket wheel are contacting a subset of the first followers of the coupling section; a second sprocket wheel exchangeable for the first sprocket wheel and having second teeth engaging the saw chain for driving the saw chain, wherein the first sprocket wheel with the first teeth has a first geometry and the second sprocket wheel with the second teeth has a second geometry different from the first geometry; the coupling section comprising second followers and, when the second sprocket wheel is used in place of the first sprocket wheel, the coupling section in the at least one rotary direction of the drive element is drivingly connected with form fit to the second teeth of the second sprocket wheel and the second teeth of the second sprocket wheel project in the radial direction between the second followers; the second sprocket wheel comprising second follower surfaces interacting with the second followers of the coupling section, respectively, wherein in a circumferential direction of the second sprocket wheel in the at least one rotary direction of the drive element a subset of the second follower surfaces of the second sprocket wheel are contacting a subset of the second followers of the coupling section when the second sprocket wheel is used in place of the first sprocket wheel; wherein the first followers are positioned at a first spacing relative to each other in the rotary direction of the drive element and the first spacing has a first length and the second followers are positioned at a second spacing relative to each other in the rotary direction of the drive element and the second spacing has a second length; wherein the first followers and the second followers are positioned at a third spacing relative to each other in the rotary direction of the drive element and the third spacing has a third length; wherein the first length is different from the second length; wherein the third length is different from the first length and different from the second length; wherein the coupling section contacts with the first followers the first follower surfaces of the first sprocket wheel or with the second followers the second follower surfaces of the second sprocket wheel when the second sprocket wheel is used in place of the first sprocket wheel.