Safety drive hammer for a dynamic cone penetrometer

Details Safety drive hammer for a dynamic cone penetrometer Safety drive hammer for a dynamic cone penetrometer

2005-12-13

2005-12-13

Williams, Hezron (Department: 2856)

Measuring and testing

Hardness

By penetrator or indentor

C073S084000

Reexamination Certificate

active

06973822

ABSTRACT:
Drive hammer assembly with a drive hammer and rod is used with dynamic cone penetrometer tests. A rod end is attached to a cone penetrometer used to measure strength and density of soil. The assembly has no exterior impact zones, eliminating any chance of user injury. A casing loosely fits around a rod. A casing upper end is fitted with a top plate and lower end is fitted with an end plate through which the rod passes. Upper end of the rod is flared with a shoulder which may be welded to the top of the rod. Lower end of the rod is threaded to connect the rod to standard rod and cone assemblies. The hammer is raised to the shoulder on the upper end of the rod. The hammer slides along the rod until the top plate impacts upon the shoulder and drives the DCP cone into the ground.

REFERENCES:
patent: 3080749 (1963-03-01), Hollander
patent: 3331240 (1967-07-01), Nilsson et al.
patent: 3625295 (1971-12-01), Gunning
patent: 4405020 (1983-09-01), Rassieur
patent: 5313825 (1994-05-01), Webster et al.
patent: 5616833 (1997-04-01), Andersson
patent: 5663649 (1997-09-01), Topp et al.
patent: 5886253 (1999-03-01), Joustra
patent: 6138501 (2000-10-01), Rastegar
patent: 1420747 (1976-01-01), None
patent: 207513 (1989-08-01), None

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