| 摘要 |
Apparatus to break rock and concrete slabs in situ when inserted into predrilled holes in rock and concrete slabs comprises first and second members each having outer surfaces engaging walls of the predrilled holes; a third member having a driven end, a free end, a first surface parallel to the outer surfaces of the first and second members slidably engaging a flat bottom surface of a longitudinal groove in and coextensive with the first member and a second surface opposite the first surface having a first predetermined slope along a given length from a point adjacent the driven end to the free end, the third member reciprocating in the groove a predetermined number of times greater than one during each cycle of operation and with a predetermined stroke length; and an arrangement disposed between the second surface of the third member and an inner surface of the second member actuated by each inward stroke of the third member to apply a powerful breaking force directly to the second member resulting in lateral movement thereof, to apply a reaction force equal to the breaking force to the first member and to retain the second member in its achieved position due to the lateral movement at the end of each inward stroke of the third member during the cycle of operation while the third member is withdrawn prior to its next inward stroke.
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