Abstract A high-frequency vibrator for pushing pipe underground and plowing in underground cable is disclosed. An alternating electromagnetic field is established in a generally S-shaped magnetic core by connecting each of two opposing coils of the vibrator to a corresponding phase of a two phase AC electrical system, whereby one coil experiences zero current while the other coil generates a maximum magnetic field. The coils are wound on opposite ends of the S-shaped core and affect their respective ends of the core at complementary intervals. Air gaps are constructed in the core to interrupt the normal flow of flux within the core, the gaps being located on opposite sides of the core to provide the S shape. The alternate energization of the coils at complementary intervals causes first one coil and then the other to produce a magnetic flux which tends to close its corresponding airgap since these airgaps are on opposite sides of the core, first one side, then the other side of the core tends to shorten, creating a side-to-side bending motion.
Inventors
👤 Marlin D Lee
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 21:59
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A sonic vibrator comprising: an outer shell; at least one laminated core within said outer shell; a two-phase electrical source; at least two coils wound on each said core; and circuit means for connecting said two-phase electrical source to said coils.
Claim 2
Dependent Claim
41 words
A sonic vibrator comprising: an outer shell; at least one laminated core within said outer shell; a two-phase electrical source; at least two coils wound on each said core; and circuit means for connecting said two-phase electrical source to said coils.
Claim 3
Dependent Claim
33 words
The vibrator of claim 1, wherein said laminated core is S-shaped and has an airgap at each end of said core preventing either end of said core from forming a completely closed loop.
Claim 4
Dependent Claim
14 words
The vibrator of claim 1, wherein said outer shell has a conically shaped tip.
Claim 5
Dependent Claim
17 words
The vibrator of claim 1, wherein said outer shell has a section adapted to engage tubular objects.
Claim 6
Dependent Claim
24 words
The vibrator of claim 1, wherein said outer shell has a nonmagnetic spacer to prevent longitudinal movemEnt of said laminated core within said shell.
Claim 7
Dependent Claim
54 words
The vibrator of claim 2, wherein said circuit means includes a conductor connecting one phase of the output from said two-phase electrical source to one of said coils on each said core, the coil adjacent thereto being connected to the second phase of the output from said two-phase electrical source via a second conductor.
Claim 8
Dependent Claim
45 words
The vibrator of claim 6, wherein said coils are wound on opposite ends of said S-shaped core to produce separate flux paths in said core including said airgaps, said first and second phase outputs producing a maximum flux in their respective coils at complementary intervals.