Tool driving or impacting – Impacting devices – Hammer head driven by relatively moving motion transmitting...
Patent
1994-03-31
1995-08-29
Smith, Scott A.
Tool driving or impacting
Impacting devices
Hammer head driven by relatively moving motion transmitting...
173 84, 173 89, 173202, E02D 708
Patent
active
054452279
ABSTRACT:
A release mechanism for a hydraulic/pneumatic post driver is described. The post driver has a hammer and a guide for directing the hammer from a raised release position along a substantially vertical downward impact path. A hydraulically or pneumatically actuated fluid expandable cylinder is disposed above the hammer and has a telescopically extendible piston for lifting the hammer to the raised release position. The improvement includes one of the piston and the hammer having a female member with inwardly directed gripping dogs. The other of the piston and the hammer has a male member with outwardly directed gripping rollers. One of the inwardly directed gripping dogs and the outwardly directed gripping rollers is spring biased to maintain engagement between the dogs and rollers. A triggering mechanism is provided on the guide to overcome the biasing force of the spring to disengage the dogs and the rollers when the hammer reaches the raised release position.
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Lambert Anthony R.
Smith Scott A.
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