B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 47/26 (2006.01)
Patent
CA 2136786
A longitudinal and rotary vibration dampener or shock absorber for rotary and percussion drill bits has a resilient element to absorb axial compression loads; a resilient element to absorb axial tension loads, resilient elements to absorb torque loads; radial guide surfaces for long wear between the driver and the driven members and preferably spaced apart axially to resist bending couple loads applied across the two members during operation; and a sealing means and surface to allow passage of air or other fluid through the unit during operation. A preferred embodiment has a drive shaft and a driven shaft interconnected by separate longitudinal and torque load absorbing members, one shaft having internal drive plates or splines fitting inside cavities on the other and separate elastomeric shock absorbing members absorbing rotary torque and extension shock loads. Radial slots aligned with the splines permit longitudinal overtravel movement when operated in compression. An elastomeric shock absorbing member positioned in a cavity between the shafts absorbs longitudinal compressive shock loads.
Finlayson & Singlehurst
Wohlfeld William I.
LandOfFree
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