Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A front fork suitable for a motorcycle comprising: an inner cylinder mechanism which includes a main cylinder and a main piston disposed at the lower end thereof; an outer cylinder slidably fitted to said inner cylinder mechanism; a sheet pipe anchored at the bottom portion of said outer cylinder and slidably fitted to said inner cylinder mechanism, said sheet pipe including an auxiliary piston disposed at the upper end thereof and having an oil port formed in the side of the lower portion thereof; and orifice means for allowing the oil between said main piston and said auxiliary piston to flow into one of said inner cylinder mechanism and said sheet pipe at the extension stroke of said front fork to thereby stepwise reduce an attenuating force; said orifice means including an oil port formed at the side of the lower portion of said inner cylinder mechanism, at least one orifice formed in the axial direction in the upper portion of said inner cylinder mechanism, and an orifice formed at the side of the upper portion of said sheet pipe.
Claim 2
Dependent Claim
180 words
A front fork suitable for a motorcycle comprising: an inner cylinder mechanism which includes a main cylinder and a main piston disposed at the lower end thereof; an outer cylinder slidably fitted to said inner cylinder mechanism; a sheet pipe anchored at the bottom portion of said outer cylinder and slidably fitted to said inner cylinder mechanism, said sheet pipe including an auxiliary piston disposed at the upper end thereof and having an oil port formed in the side of the lower portion thereof; and orifice means for allowing the oil between said main piston and said auxiliary piston to flow into one of said inner cylinder mechanism and said sheet pipe at the extension stroke of said front fork to thereby stepwise reduce an attenuating force; said orifice means including an oil port formed at the side of the lower portion of said inner cylinder mechanism, at least one orifice formed in the axial direction in the upper portion of said inner cylinder mechanism, and an orifice formed at the side of the upper portion of said sheet pipe.
Claim 3
Dependent Claim
27 words
A front fork according to claim 1, further comprising a rebound spring sandwiched between said main piston and said auxiliary piston for preventing a collision there between.
Claim 4
Dependent Claim
28 words
A front fork according to claim 1, wherein said main piston has a check valve adapted to be opened only at the compression stroke of said front fork.
Claim 5
Dependent Claim
70 words
A front fork according to claim 1, wherein said inner cylinder mechanism further includes an auxiliary cylinder fitted between said sheet pipe and said main inner cylinder, and wherein said orifice means includes a plurality of orifices formed in said auxiliary cylinder at a predetermined spacing from each other, and an oil port formed in said auxiliary cylinder spaced from said plural orifices in the direction of said main piston.
Claim 6
Dependent Claim
32 words
A front fork according to claim 4, wherein the uppermost orifice of said auxiliary cylinder is positioned above said auxiliary piston when the pressure in said inner cylinder is at its maximum.
Claim 7
Dependent Claim
31 words
A front fork according to claim 4, wherein the oil port of said auxiliary cylinder has a larger effective area than the sum of the effective areas of said plural orifices.
Claim 8
Dependent Claim
28 words
A front fork according to claim 4, wherein said main piston has a check valve adapted to be opened only at the compression stroke of said front fork.