Hydraulic impact tool

Details Hydraulic impact tool Hydraulic impact tool

1985-12-20

1988-02-16

Bell, Paul A.

Tool driving or impacting

Impacting devices

With means to cause or control advance of hammer head

173134, 91238, B25D 900

Patent

active

047249110

ABSTRACT:
A hydraulic impact tool having a housing, a working tool, a ram, an energy storage device, and a valve slide. The tool also has a high pressure hydraulic fluid inlet port, an intermediate pressure hydraulic fluid inlet port, and one or two return lines. If there are two return lines, one of the return lines is for exhausting fluid from an upper annular chamber, and the other return line is for exhausting fluid from an intermediate annular chamber. The tool also has an optional delatch outlet, which can be opened and closed externally by the operator of the tool. The tool may also have a piston portion on the ram to restrict fluid flow between the ram and the valve slide as the ram is accelerated toward the working tool.

REFERENCES:
patent: 3866690 (1975-02-01), Lance et al.
patent: 3995700 (1976-12-01), Mayer et al.
patent: 4062411 (1977-12-01), Adkins et al.
patent: 4181183 (1980-01-01), Okada
patent: 4231434 (1980-11-01), Justus
patent: 4413687 (1983-11-01), Eklof
patent: 4474248 (1984-10-01), Musso

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