Coupling means for horizontal vibrator with tooth-like projections

In a transducer for inducing shear waves in an elastic medium including the horizontally movable support means adapted to couple the energy of said transducer into said medium the improvement comprising a plurality of cleat means on said support structure for engaging the surface of said medium each of said plurality of cleat means comprising

• (a) a pair of like quadrangular lateral plates downwardly convergent from said support means to form a cleat edge adapted to extend horizontally and transversely to the direction of horizontal transducer motion, and
• (b) a pair of triangular opposed end plates respectively interconnected between the adjacent convergent edges of said lateral plates, and
• (c) a plurality of "V" shaped projections affixed to the outer surfaces of said lateral plates and extending downwardly therefrom, said projections being configured such that they present a total vertical bearing surface very small in relation to that of said cleat means.

In a transducer for inducing shear waves in an elastic medium including the horizontally movable support means adapted to couple the energy of said transducer into said medium the improvement comprising a plurality of cleat means on said support structure for engaging the surface of said medium, each of said plurality of cleat means comprising

• (a) a pair of like quadrangular lateral plates downwardly convergent from said support means to form a cleat edge adapted to extend horizontally and traversely to the direction of horizontal transducer motion, and
• (b) a pair of triangular opposed end plates respectively interconnected between the adjacent convergent edges of said lateral plates,
• (c) tooth-bearing means interfitted detachably within said cleat means, said teeth being adapted to extend beneath said cleat means in earth-engaging position, the edges of said teeth being aligned with said cleat edge.