Patent ID: 8151910

Claim:
A metering assembly for a drilling jar comprising a sliding assembly slideable within a barrel assembly, said barrel assembly having a restricted barrel segment defining an upper chamber and a lower chamber, a volume of fluid retained in said upper chamber, said lower chamber, and said restricted barrel segment; said metering assembly comprising: an upper flange; a lower flange; a meter valve slideable between said upper flange and said lower flange; said upper flange, said lower flange, and said meter valve constructed to slide through said restricted barrel segment; at least one upper opening provided in said upper flange, wherein at least one of said at least one upper opening is constructed to allow fluid to flow there through; at least one lower opening provided in said lower flange, wherein at least one of said at least one lower opening is constructed to allow fluid to flow there through; wherein said upper chamber is larger than said lower chamber; and wherein said fluid retained in said upper chamber, restricted barrel segment, and lower chamber is compressible fluid.