Hammer device

Details Hammer device Hammer device

2000-10-10

2002-04-16

Schoeppel, Roger (Department: 3672)

Boring or penetrating the earth

With above-ground means to impact an earth-penetrating means

C175S189000, C175S296000, C173S136000, C173S138000, C173S200000

Reexamination Certificate

active

06371222

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a hammer device, preferably for use in a rock drilling machine.
In a previously known hammer device of the above mentioned kind, see U.S. Pat. No. 5,372,196, a substantially higher impact frequency is obtained than in earlier known hammer devices. This solution has worked well regarding the impact frequency. One problem has been cavitation problems on the hammer piston at the drive surface for the return stroke of the hammer piston.
SUMMARY OF THE INVENTION
The present invention, which is defined in the subsequent claim, aims at achieving a hammer device where the high impact frquency is substantially maintained at the same time as the cavitation problems of the previously known hammer device are avoided.


REFERENCES:
patent: 5207280 (1993-05-01), Rodert et al.
patent: 5320189 (1994-06-01), Rodert et al.
patent: 5372196 (1994-12-01), Andersson
patent: 5375670 (1994-12-01), Ekwall et al.

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