Patent ID: 6009771
Filing Date: 2000-01-04
Classification: B62M,Y10T

Abstract:
A device for switching a chain on different sprockets of a pedal bearing mounted to a seat tube of bicycle frames having a chain brace, said device being mountable on different bicycle frames wherein the seat tube is disposed relative to said chain brace at one of a first angular area and a second angular area with a difference between said first angular area and said second angular area of up to 6.degree., said device comprising:a parallel guide device having a base;a cage swivelably mounted to said parallel guide device about a fastening axis for guiding and switching the chain, said cage being formed from a single sheet metal blank having a center and said cage having a cage construction selected from the group consisting of a first cage construction and a second cage construction, wherein said first cage construction is disposed at a first adjusting angle relative to the fastening axis for the first angular area and said second cage construction is disposed at a second adjusting angle relative to the fastening axis for the second angular area, said cage including a first bracket having a first joint bore hole defined therein and a second bracket having a second joint bore hole and a guide bore hole defined therein, wherein said first and second cage constructions respectively optimize positioning of said cage relative to a traction portion of the chain over the first and second angular areas;wherein each of said first and second brackets comprises one of first and second bending edges, said first bending edges being used for said first cage construction and said second bending edges being used for said second cage construction; andwherein a difference between said first adjusting angle of said first cage construction and said second adjusting angle of said second cage construction is equal to the difference between the first angular area and the second angular area.