Percussion device with a transmission element compressing an elastic energy storing material
AssigneeSandvik Mining and Construction Oy
InventorsMarkku Keskiniva, Erkki Ahola, Ari Kotala
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Abstract
A percussion device for a rock drilling machine or the like, which includes providing an impact, i.e. a stress pulse, to a tool connected to the percussion device. The the stress pulse is provided by way of a stress element of liquid, which is supported to a body of the percussion device. The stress element is subjected to pressure and correspondingly the stress element is released abruptly, whereby the stress energy is discharged as a stress pulse to the tool in direct or indirect contact with the stress element.
Claims9
A percussion device having means for providing a stress pulse in a tool connected to the percussion device, wherein the means for providing a stress pulse include:
- an energy storing space, which is located in the body of the percussion device and limited by the body of the percussion device and a separate transmission element located movably in the axial direction of the tool with respect to the body of the percussion device, the energy storing space being filled with elastic and reversible, compressible energy storing material, the energy storing material being liquid,
- means for bringing the energy storing material to stress state by increasing its pressure so that when the energy storing material is in a desired state of stress, the transmission element is in a position with respect to the body of the percussion device, from which position the transmission element can move with respect to the body of the percussion device towards the tool, and means for releasing the transmission element abruptly to move towards the tool, whereby the energy stored in the energy storing material is discharged as a stress pulse via the transmission element to the tool that is directly or indirectly in contact therewith, and wherein the transmission element is a membrane that limits the energy storing space.
Dependencies are inferred from the claim text.