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A crankset device has a chain ring, a tube connected to the chain ring, the tube having a hollow interior, and a crank arm passing through the chain ring, the hollow interior, an elastic washer, an annular retainer, and an annular cover. The crank arm has two protrusions. A first collar set surround

A crankset device has a chain ring, a tube connected to the chain ring, the tube having a hollow interior, and a crank arm passing through the chain ring, the hollow interior, an elastic washer, an annular retainer, and an annular cover. The crank arm has two protrusions. A first collar set surrounds the crank arm. A second collar set surrounds the crank arm. The first collar set is disposed in a first end portion of the tube. The second collar set is disposed in a second end portion of the tube. The annular cover covers the second end portion of the tube. The annular retainer is inserted in the annular cover. The elastic washer is disposed between the second collar set and the annular retainer.

대표청구항 ▼

[ I claim:] [1.] A crankset device comprising, in combination:a chain ring,a tube having a hollow interior,a crank arm passing through a center of the chain ring, the hollow interior of the tube, an elastic washer, and an annular retainer,the crank arm having a distal end, a middle portion, and at l

[ I claim:] [1.] A crankset device comprising, in combination:a chain ring,a tube having a hollow interior,a crank arm passing through a center of the chain ring, the hollow interior of the tube, an elastic washer, and an annular retainer,the crank arm having a distal end, a middle portion, and at least a protrusion disposed on the middle portion,a first semicircular collar coupling with a second semicircular collar,the first semicircular collar and the second semicircular collar surrounding the crank arm,a third semicircular collar coupling with a fourth semicircular collar,the third semicircular collar and the fourth semicircular collar surrounding the crank arm,the first semicircular collar and the second semicircular collar disposed in a first end portion of the tube,the third semicircular collar and the fourth semicircular collar disposed in a second end portion of the tube,the annular retainer comprises a center hole, at least a bevel disposed in an inner periphery of the annular retainer, and at least a positioning groove communicating with the center hole for engaging with the protrusion of the crank arm,the elastic washer disposed between the annular retainer, and the third semicircular collar and the fourth semicircular collar, andan annular cover for covering the second end portion of the tube, wherein the annular retainer further comprises, in combination: at least a protruded block; and wherein the annular cover includes an inner flange engaged with the protruded block.