Apparatus for generating P waves and S waves

Claim 1

An apparatus for generating P waves and S waves in a ground formation having a mechanism for imparting a force to a bore hole wall of the ground formation through bore hole water, comprising: a housing; a rigid body movably mounted in said housing, said rigid body having a cylindrical magnetic plunger and protection members for protecting said cylindrical magnetic plunger, said protection members being cup shaped and fixed to ends of said cylindrical magnetic plunger; percussive means for abruptly increasing a water pressure within said bore hole, said percussive means having planar members of rigid materials, said planar members being outwardly projectably mounted to opposite portions of said housing with spaces being formed between each of said planar members and opposite ends of said rigid body, said planar members being covered with resilient layers and projectable outwardly against the resilient force of said resilient layers, said planar members each having an aperture at the central portion thereof to form a space at least between each of said protection members and each of said resilient layers; an electrically insulating and anticorrosive liquid filled in said space formed between said protection members and said resilient layers, and a driving means for selectively driving said rigid body into a collision with said planar members of the percussive means to thereby generate P waves when said rigid body collides with said planar members of said percussive means and to thereby generate S waves when said rigid body is driven so as to not collide with said planar members of said percussive means.

Claim 2

An apparatus for generating P waves and S waves in a ground formation having a mechanism for imparting a force to a bore hole wall of the ground formation through bore hole water, comprising: a housing; a rigid body movably mounted in said housing, said rigid body having a cylindrical magnetic plunger and protection members for protecting said cylindrical magnetic plunger, said protection members being cup shaped and fixed to ends of said cylindrical magnetic plunger; percussive means for abruptly increasing a water pressure within said bore hole, said percussive means having planar members of rigid materials, said planar members being outwardly projectably mounted to opposite portions of said housing with spaces being formed between each of said planar members and opposite ends of said rigid body, said planar members being covered with resilient layers and projectable outwardly against the resilient force of said resilient layers, said planar members each having an aperture at the central portion thereof to form a space at least between each of said protection members and each of said resilient layers; an electrically insulating and anticorrosive liquid filled in said space formed between said protection members and said resilient layers, and a driving means for selectively driving said rigid body into a collision with said planar members of the percussive means to thereby generate P waves when said rigid body collides with said planar members of said percussive means and to thereby generate S waves when said rigid body is driven so as to not collide with said planar members of said percussive means.

Claim 3

An apparatus for generating P waves and S waves in a ground formation having a mechanism for imparting a force to a bore hole wall of the ground formation through bore hole water, comprising: a housing having an outer casing mounted therein; a rigid body of hollow structure having an inner casing and plungers, said rigid body being movably supported within said outer casing by means of a spring device, and said plungers being engaged with opposite ends of said inner casing; a percussive means for abruptly increasing a water pressure within said bore hole; and a driving means for driving said rigid body into a collision with said percussive means, said driving means being movably mounted in said rigid body and movably supported within said inner casing by means of a spring device, said rigid body and said driving means being movable in a direction perpendicular to the axis of said bore hole, and driven in a relatively opposite direction, thereby minimizing an obstruction force due to a reaction of said rigid body.

Claim 4

An apparatus for generating P waves and S waves in a ground formation having a mechanism for imparting a force to a bore hole wall of the ground formation through bore hole water, comprising: a housing having an outer casing mounted therein; a rigid body of hollow structure having an inner casing and plungers, said rigid body being movably supported within said outer casing by means of a spring device, and said plungers being engaged with opposite ends of said inner casing; a percussive means for abruptly increasing a water pressure within said bore hole; and a driving means for driving said rigid body into a collision with said percussive means, said driving means being movably mounted in said rigid body and movably supported within said inner casing by means of a spring device, said rigid body and said driving means being movable in a direction perpendicular to the axis of said bore hole, and driven in a relatively opposite direction, thereby minimizing an obstruction force due to a reaction of said rigid body.

Claim 5

An apparatus for generating P waves and S waves in a ground formation comprising a mechanism for imparting a force to a bore hole wall of the ground formation through bore hole water, wherein said apparatus comprises: a housing; a hollow body movably mounted in said housing; a percussive means for abruptly increasing a water pressure within said bore hole, said percussive means being attached to opposite ends of said hollow body; and a driving means for selectively driving said hollow body into collision with said percussive means, said driving means having a rigid portion collidable with said percussive means and being movably supported within said hollow body by means of a spring device, thereby selectively generating P waves when said driving means is driven so as to collide with said percussive means and S waves when said driving means is driven so as to not collide with said percussive means.

Claim 6

An apparatus for generating P waves and S waves in a ground formation comprising a mechanism for imparting a force to a bore hole wall of the ground formation through bore hole water, wherein said apparatus comprises: a housing; a hollow body movably mounted in said housing; a percussive means for abruptly increasing a water pressure within said bore hole, said percussive means being attached to opposite ends of said hollow body; and a driving means for selectively driving said hollow body into collision with said percussive means, said driving means having a rigid portion collidable with said percussive means and being movably supported within said hollow body by means of a spring device, thereby selectively generating P waves when said driving means is driven so as to collide with said percussive means and S waves when said driving means is driven so as to not collide with said percussive means.