| 摘要 |
A double-acting hydraulic striking tool, wherein a hammer's (8) upper end (9 ) is rigidly connected to an upper piston (10), and wherein the hammer's (8) lower end (26) is rigidly co nnected to a lower piston (26). The pistons (10, 27), which can be displaced within a tubular housing (11), are adapted to open and close for a forced flow of liquid from the upper end (9) of the hammer (8) towards the lower en d (26). The hammer (8) is activated for downwardly directed blows by pressing against the hammer's (8) upper end (9) with a resilient force, causing the lower piston (27) to close the liquid flow, whereby the housing (11) is lifted hydraulically until the piston (27) opens for the liquid flow, and the forced spring force drives the housi ng (11) downwardly to impinge on the hammer's (8) lower end (26) through impact faces (34, 36). The hammer (8) i s activated for upwardly directed strokes by lifting the upper end (9) of the hammer (8) as well as the housi ng (11) with a resilient force. so that the upper piston (10) closes for liquid, whereby the piston (10) drives the ha mmer's (8) upper end (9) downwardly until the piston (10) opens for liquid, whereafter the upwardly acting resil ient force drives the hammer's (8) upper end (9) upwards to impinge on the housing (11) through impact faces (33, 35) .
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