Importance

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Abstract

A vibration dampener for use on top-drive rotary drills. The apparatus of the present invention comprises a generally cylindrical housing having a cylindrical side, a top, a bottom, and a central divider plate. The top of the housing has an externally threaded bore therethrough which may be connected to the rotary drive of the drill. A central, coaxial tube is slidably received within the housing. The downward end of this tube may be connected to the drill pipe, and the tube thus provides a conduit through which air may be forced. A generally circular compression plate is connected within the housing to the central tube so as to be adjacent and substantially parallel to the bottom of the housing. A resilient pad is positioned between the compression plate and the central divider plate such that an upward force on the central tube causes the compression plate to be lifted and the resilient pad to be compressed between the compression plate and the divider plate. A plurality of radial paddle members are connected within the housing to the central tube so as to lie just above the central divider plate. A resilient pad is positioned between each pair of paddles, and each pad is secured in some suitable manner so as to prevent rotational movement of the pad with respect to both the central divider plate and the top of the housing.

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First Claim