CHAIN-SPROCKET MECHANISM, CHAIN AND SPROCKET
First Claim
1. A chain-sprocket mechanism comprising:
- a plurality of disc-shaped sprockets having a plurality of teeth disposed around the perimeter and rotatably mounted; and
a chain provided so as to mesh with the teeth of the sprockets and moving according to the rotation of the sprockets, the chain being structured by coupling a plurality of link plates that consist of a pair of outer plates provided so as to oppose each other, a pair of inner plates disposed inside the outer plates, a cylindrical bushing fitted to the inner plates and having contact with the teeth, and a pin inserted through the outer plates, the inner plates and the bushing, wherein the surface of at least either of the teeth or the bushing comprises a non-metallic material.
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Accused Products
Abstract
A chain-sprocket mechanism is disclosed which is highly resistant to corrosion caused by a potential difference arising when metallic materials of different types contact each other. A chain of the chain-sprocket mechanism is structured by coupling a plurality of chain links that consist of pairs of outer plates, pairs of inner plates, bushings fixed to the inner plates and pins inserted through the outer plates, the inner plates and the bushing, which meshes with teeth of a sprocket. The surface of either of the bushing or the teeth is formed of a non-metallic material; thereby, a potential difference does not arise through the contact between the bushing and the teeth. Accordingly, corrosion caused by a potential difference can be avoided, i.e., the corrosion resistance of the chain-sprocket mechanism can be improved.
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Citations
28 Claims
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1. A chain-sprocket mechanism comprising:
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a plurality of disc-shaped sprockets having a plurality of teeth disposed around the perimeter and rotatably mounted; and
a chain provided so as to mesh with the teeth of the sprockets and moving according to the rotation of the sprockets, the chain being structured by coupling a plurality of link plates that consist of a pair of outer plates provided so as to oppose each other, a pair of inner plates disposed inside the outer plates, a cylindrical bushing fitted to the inner plates and having contact with the teeth, and a pin inserted through the outer plates, the inner plates and the bushing, wherein the surface of at least either of the teeth or the bushing comprises a non-metallic material. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A chain-sprocket mechanism comprising:
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a plurality of disc-shaped sprockets having a plurality of teeth disposed around the perimeter and rotatably mounted; and
a chain provided so as to mesh with the teeth of the sprockets and moving according to the rotation of the sprockets, the chain being structured by coupling a plurality of link plates that consist of a pair of outer plates provided so as to oppose each other, a pair of inner plates disposed inside the outer plates, a cylindrical bushing fitted to the inner plates and having contact with the teeth, and a pin inserted through the outer plates, the inner plates and the bushing, wherein the surfaces of the teeth and the bushing comprise a metallic material common to both members. - View Dependent Claims (9, 10, 11)
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12. A chain comprising:
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pairs of stepped plates, wherein the outer plate portion has a pin insert hole at its end and the inner plate portion has a bushing fitting hole at its end;
bushings fitted in the bushing fitting holes; and
pins inserted through the pin insert holes and the bushing, wherein the bushing is formed of a plastic material, having a notch at both ends, and the bushing fitting holes have a shape corresponding to the shape of the bushing ends. - View Dependent Claims (13, 14, 15)
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16. A sprocket comprising:
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a disc-shaped body;
tooth members replaceably attached around the perimeter of the body; and
bolts for tightening the tooth members to the body, wherein the surfaces of at least two of the body, the tooth members and the bolts comprise a non-metallic material. - View Dependent Claims (17, 18, 19, 20)
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21. A sprocket comprising:
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a disc-shaped body;
tooth members replaceably attached around the perimeter of the body; and
bolts for tightening the tooth members to the body, wherein the surfaces of the body, the tooth members and the bolts comprise a metallic material common to all the members. - View Dependent Claims (22)
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23. A sprocket comprising:
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a disc-shaped body;
tooth members replaceably attached around the perimeter of the body; and
bolts for tightening the tooth members to the body, wherein the surfaces of any two of the body, the tooth members and the bolts comprise a metallic material common to the two members, and the surface of the remaining one comprises a non-metallic material. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification