초록 ▼

A diesel hammer (20) is adapted to produce uplift blows by connecting its casing (30) via a pulling connection (52) to a case (24) to be pulled, removing vent plugs (76) from the top of the casing, sealing all other openings (78), (82), (94), in the casing, applying compressed air from an external s

A diesel hammer (20) is adapted to produce uplift blows by connecting its casing (30) via a pulling connection (52) to a case (24) to be pulled, removing vent plugs (76) from the top of the casing, sealing all other openings (78), (82), (94), in the casing, applying compressed air from an external source (106) under the hammer ram (32) to drive it upwardly and thereafter allowing controlled flow of air out of the casing via a bleed line (118) and an adjustable orifice (238) to cushion the subsequent fall of the ram.

대표청구항 ▼

In a diesel hammer which comprises a cylindrical casing, a ram fitted to move up and down in said casing, an anvil at the lower end of said casing to receive blows from said ram, inlet and exhaust ports formed in said casing to admit air to be compressed by the downward movement of said ram and to a

In a diesel hammer which comprises a cylindrical casing, a ram fitted to move up and down in said casing, an anvil at the lower end of said casing to receive blows from said ram, inlet and exhaust ports formed in said casing to admit air to be compressed by the downward movement of said ram and to allow combustion gases to be expelled when said ram is raised and a fuel injection mechanism for admitting diesel fuel into the region under said ram when said ram compresses air thereunder and impacts said anvil, said inlet and exhaust ports and said fuel injection mechanism being arranged to cooperate with each other to provide diesel operation in the delivery of downward blows against said anvil, the improvement which comprises structural means to cause said hammer to operate in a non-diesel manner for delivery of uplift blows to said casing to extract an element from the ground, said structural means comprising, an upper anvil in the upper end of said casing above the height to which said ram is thrown during diesel operation, a vent valve connected to the upper end of said casing to vent same and permit unrestricted upward movement of said ram during non-diesel operation, ram drive means connected to said casing and arranged to throw said ram upwardly in said casing, independently of said diesel operation, to a height sufficient to impact against said upper anvil, closures arranged to close said inlet and exhaust ports, valve means connected to the lower part of said casing to permit limited escape of gas therefrom, said closures and valve means cooperating when said hammer operates in a non-diesel manner to entrap and slowly release gases under said ram and cushion against heavy impacts against said lower anvil and a pulling connection attached to said casing for connecting said casing to a member which is to receive uplift blows.