Electrical hand operated tool driving device with an electropneumatic striking mechanism
AssigneeHilti Aktiengesellschaft
InventorsHans-Werner Bongers-Ambrosius, Martin Richter, Konrad Artmann
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Abstract
An electrical hand operated tool driving device (1), such as a hammer drill, a combination hammer or a chipping hammer, has an electropneumatic striking mechanism (2), for which a cooling medium (8), for cooling the striking mechanism (2), flows through a liquid-tight cooling medium duct (10, 11, 12, 13), which is disposed in a housing (7) of the tool driving device (1).
Claims8
An electrical hand operated tool driving device comprising a housing (7) having a tool driving axis (A) and a front end for receiving a tool and a rear end, an electropneumatic striking mechanism (2) within said housing (7) and including a driving piston (4) moving along said tool driving axis (A), a free piston (6) spaced ahead of said driving piston along said tool driving axis (A) and an air spring (5) located between said driving piston (4) and said free piston (6) along said tool driving axis (A), a liquid-tight cooling duct (10, 11, 12, 13) within said housing extending around said striking mechanism (2) for flowing a cooling medium (8) for cooling said striking mechanism.
Dependencies are inferred from the claim text.