B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
B25D 9/14 (2006.01)
Patent
CA 2068868
A hydraulically powered repetitive impact hammer (20) has internal features for ensuring continued automatic repetitive operation under adverse conditions, and fluid cushioning of internal parts to prevent damage from abrupt metal-to-metal contact. The hammer head (31) of the impact hammer (20) has an internal poppet (55) which automatically closes to enable the buildup of pres- sure in a compression chamber during reloading in preparation for the hammer head's next blow (31), and automatically opens to enable the pressure in the compression chamber (47) to drive the hammer head (31) to strike an impact tool (25). To prevent inadvertent stalling of the hammer dur- ing reloading if the impact tool (25) is pressed forcibly into contact with the working face (30) after striking a blow, the amplification ratio of the hammer head (31) is made greater than the amplifica- tion ratio of the poppet (55). Fluid cushioning of the hammer head (31) to prevent abrupt metal-to- metal contact with the frame (21) of the hammer (31) at the end of the driving stroke is provided by a temporary fluid restriction which operates only when the hammer head (31) is near the end of its driving stroke. Fluid cushioning of the poppet (55) to prevent abrupt contact with the hammer head (31) is provided by mating fluid cushioning surfaces (195, 197) formed on the hammer head (31) and poppet (55), respectively, for enclosing fluid in a confined space as the poppet (55) approaches one or the other extremity of its range of movement in the hammer head (31).
Esco Corporation
Oyen Wiggs Green & Mutala
LandOfFree
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