Patent ID: 9169891
Filing Date: 2015-10-27
Classification: F16F

Abstract:
1. A shock absorbing device comprising: a cylinder; a partition wall member that is inserted into the cylinder to be free to slide and partitions an interior of the cylinder into two operating chambers; a passage that connects the two operating chambers; a pressure chamber; a one side flow passage; an other side flow passage; a free piston that is inserted into the pressure chamber to be free to slide and partitions the pressure chamber into a one chamber that communicates with one operating chamber of the operating chambers via the one side flow passage, and an other chamber that communicates with the other operating chamber of the operating chambers via the other side flow passage; a spring element that generates a biasing force for suppressing displacement of the free piston relative to the pressure chamber; a first bypass flow passage that connects the other chamber and the one operating chamber; a second bypass flow passage that connects the one chamber and the other operating chamber, wherein an opening area of an end, which opens onto the pressure chamber, of the first bypass flow passage is unobstructed by the free piston when the free piston slides, wherein an opening area of an end, which opens onto the pressure chamber, of the second bypass flow passage is unobstructed by the free piston when the free piston slides, further wherein both the first bypass flow passage and the second bypass flow passage are unobstructed by the free piston; and a relief valve in the first and second bypass flow passages.