Tool driving or impacting – Impacting devices – Hammer head driven by spring
Reexamination Certificate
2005-11-22
2005-11-22
Sipos, John (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head driven by spring
C173S115000, C173S118000, C173S090000
Reexamination Certificate
active
06966390
ABSTRACT:
A power tool (1) has a percussive driving implement for driving an impact tool (8). The driving implement, which may be hydraulic or pneumatic, retracts the impact tool (8) on its return stroke, against the force developed by heavy-duty elastic ropes (24). During the impact stroke the impact tool (8) is urged downwardly by the elastic ropes and, if the tool is upright, by gravity. At the start of the impact stroke the ram (10) is uncoupled by a ball clutch. At the beginning of the return stroke the ball clutch acts to couple the ram once again to the weight (20) and impact tool (8), in order to lift these to the retracted position. The uncoupling of the ram for the impact stroke reduces the loss arising from the resistance of the ram.
REFERENCES:
patent: 2455270 (1948-11-01), Valentine
patent: 2559478 (1951-07-01), Stone
patent: 2787123 (1957-04-01), Delvaux
patent: 3039546 (1962-06-01), Janson et al.
patent: 3385380 (1968-05-01), Waller
patent: 3762484 (1973-10-01), Speicher
patent: 4247149 (1981-01-01), Livesay
patent: 4359890 (1982-11-01), Coelus
patent: 4506744 (1985-03-01), Dawson
patent: 4533077 (1985-08-01), Jochum
patent: 4844661 (1989-07-01), Martin et al.
patent: 4850437 (1989-07-01), Sudnishnikov et al.
patent: 5445227 (1995-08-01), Heppner
patent: 6000477 (1999-12-01), Campling et al.
patent: 0 389 956 (1990-10-01), None
patent: 0 708 864 (1999-09-01), None
Baca Limited
Jenkins & Wilson & Taylor, P.A.
Lopez Michelle
Sipos John
LandOfFree
Pile hammer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pile hammer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pile hammer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3518970