Patent ID: 9126647
Filing Date: 2015-09-08
Classification: B62J,F16F

Abstract:
1. A bicycle seat post structure, comprising: an outer tube having a bottom end inserted into an inner tube arranged within the outer tube, and a hydraulic actuator configured in said outer tube and said inner tube; wherein said hydraulic actuator includes an upper cylinder barrel having two ends respectively disposed with a sealing plug, a lower cylinder barrel having two ends respectively disposed with a sealing plug, an intermediate cylinder barrel arranged between said upper cylinder barrel and said lower cylinder barrel and having two ends respectively inserted into said upper cylinder barrel and said lower cylinder barrel, and a pin arranged in said intermediate cylinder barrel; wherein a floating piston is configured between said upper cylinder barrel and said intermediate cylinder barrel, and wherein an air compartment is arranged above said floating piston and an upper oil compartment is arranged under said floating piston and between said upper cylinder barrel and said intermediate cylinder barrel; wherein the interspace between said pin and said intermediate cylinder barrel is provided with an oil passage, wherein the wall of said intermediate cylinder barrel relative to the upper oil compartment is configured with an oil hole so as to allow the oil passage to communicate with the upper oil compartment, and wherein the outer wall of the pin relative to the portion above said oil hole is arranged with an oil ring so as to allow the oil ring to touch the inner wall of the intermediate cylinder barrel; wherein said pin has a top end passing through the top end of the upper cylinder barrel and a bottom end passing through the bottom end of the intermediate cylinder barrel; wherein the top end of said intermediate cylinder barrel is secured to the bottom end of a bearer fixed inside the upper cylinder barrel, wherein said bearer is provided with a receiving space at the middle thereof, wherein the interior of said receiving space is arranged with an upper spring disposed to the outer side of the pin, and wherein said upper spring has a top end fastened to a shoulder of the pin, so that said upper spring may exert a force on the pin so as to allow the pin to be pulled up; wherein the bottom end of said intermediate cylinder barrel inside the lower cylinder barrel is disposed with a hollow valve, and wherein the outer wall of said hollow valve is arranged with an oil ring so as to allow the oil ring to touch the inner wall of the lower cylinder barrel; wherein the bottom end of said pin is fastened with a lower valve, and said lower valve is pulled up by the force from the upper spring to touch and kiss the hollow opening of the bottom of said hollow valve so as to form a lower oil compartment positioned at the interior of the lower cylinder barrel under said lower valve; wherein the interspace between said lower cylinder barrel and said intermediate cylinder barrel and also above the hollow valve is configured with an intermediate oil compartment, and wherein the wall of said hollow valve is disposed with a valve aperture which enables the intermediate oil compartment to communicate with the interior of the hollow valve; wherein the oil passages among said intermediate oil compartment, the aforementioned pin and the intermediate cylinder barrel may communicate with one another; characterized in that the outer side of the pin between the upper oil compartment and the lower oil compartment is fastened with an upper valve inside the hollow valve, and said upper valve may move simultaneously with the pin so that said upper valve may close the oil passage above the valve aperture to disconnect said upper oil compartment from said intermediate oil compartment when the pin is in a state of locking.