| 主权项 |
1. A hammer assembly comprising:
a hammer housing; a work tool movably supported in the hammer housing; a gas chamber defined in the hammer housing and containing a compressible gas; an accumulator assembly including an interior space, a barrier dividing the interior space into a first interior portion containing a compressible gas and a second interior portion configured to receive a pressurized fluid, the barrier being configured to be movable in response to changing the amount of pressurized fluid in the second interior portion and such that movement of the barrier varies the volume of the first interior portion, the first interior portion being in communication with the gas chamber; a control valve assembly configured for selectively placing the second interior portion of the accumulator assembly in communication with a pressurized fluid source; and a piston movably disposed in the housing and having a first fluid engagement surface configured for engagement with a pressurized fluid for moving the piston in a first direction away from the work tool and thereby compressing the compressible gas in the gas chamber and in the first interior portion of the accumulator assembly and producing a biasing force on the piston acting in a second direction towards the work tool, the piston having a second fluid engagement surface configured for engagement with a pressurized fluid for moving the piston in the second direction along with the biasing force. |
