Electrical ground rod installation device

• US 4,688,969 A
• Filed: 04/02/1986
• Issued: 08/25/1987
• Est. Priority Date: 04/02/1986
• Status: Expired due to Fees

• Current Assignee: Puget Sound Power & Light Company
• Original Assignee: Puget Sound Power & Light Company
• Inventors: Swap, Alfred G., Bruser, Lewis
• Primary Examiner(s): Taylor, Dennis L.
• Application Number:
  US06/847,540
• Time in Patent Office: 510 Days
• Field of Search: 405/239, 405/240, 405/241, 405/242, 405/243, 405/303, 405/258, 405/232, 52/165, 52/157, 174/7, 174/6
• US Class Current: 405/303
• CPC Class Codes: H01R 4/66 Connections with the terrestrial mass, e.g. earth plate, earth pin

Abstract

A ground rod installation device having an auger fixedly mounted on the lower end of an elongated drive shaft. A pilot drill projects downwardly from the lower end of the auger. The shaft, auger, and pilot drill have aligned axial passages into which the ground rod is inserted. A releasable fastener then secures the ground rod in place inside the shaft. The shaft is rotated in one direction, thereby causing the auger to draw the shaft into the ground. After the releasable fastener has released the ground rod from the shaft, the shaft is rotated in the opposite direction, thereby withdrawing the shaft from the ground while allowing the ground rod to fall through the passages in the auger and pilot drill and remain in the ground.

Claims

1. An improved device for installing electrical ground rods, comprising:

a rigid elongated shaft having a central passage through its longitudinal axis adapted to slidably receive said ground rod;

a screw auger fixedly mounted at the lower end of said shaft, said auger having a central passage through its longitudinal axis that is aligned with the central passage of said shaft so that said ground rod may project from the central passage of said shaft through the central passage of said auger; and

fastening means for releasably securing said ground rod within at least one of said central passages, whereby rotating of said shaft in one direction causes said installation device to be drawn into the ground, while rotation of said shaft in the opposite direction, after said ground rod has been released by said fastening means, causes said installation device to be drawn out of the ground, leaving only said ground rod in the ground.

2. The improved ground rod installation device of claim 1 wherein the cross section of the rigid elongated shaft is square.

3. The improved ground rod installation device of claim 1 wherein a pilot drill projects downwardly from the lower end of said auger, said pilot drill having a through-bore aligned with the central passage of said auger to allow said ground rod to pass through said pilot drill when said ground rod is released by said fastening means.

4. The improved ground rod installation device of claim 1 wherein said fastening means includes a nut mounted on said shaft and a bolt threaded through said nut and extending into the central passage of said shaft to force said ground rod against the sides of said central passage.

5. An improved system for installing electrical ground rods, comprising:

a hollow elongated shaft;

a rotary drive unit engaging said shaft and selectively rotating said shaft in either direction; and

a screw auger fixedly mounted on one end of said shaft for insertion into and removal from the ground with the shaft, said auger having a through-bore that is aligned with the hollow axis of said shaft, whereby a ground rod inserted in the hollow axis of said shaft may be installed in the ground by selectively causing said rotary drive unit to rotate said shaft in one direction in order to drive said auger into the ground and then selectively causing said rotary drive unit to rotate said shaft in the opposite direction in order to withdraw said auger from the ground and allow said ground rod to fall through said through-bore of said housing and remain in the ground.

6. The system of claim 5, further including a releasable fastener releasably securing said ground rod-in the hollow axis of said shaft in order to prevent said ground rod from falling through the through-bore of said auger until said fastener has released said ground rod.

7. The system of claim 6 wherein said releasable fastener includes a nut mounted on said shaft and a bolt threaded through said nut and extending into the hollow axis of said shaft to force said ground rod against the inside walls of said shaft.

8. The system of claim 5 wherein said rotary drive unit comprises a bar and a hydraulic motor selectively rotating said bar in opposite directions.

9. The system of claim 8, further including a collar connecting the lower end of said bar to the upper end of said shaft, said collar having a cylindrical configuration with two opposed axial recesses receiving the ends of said bar and shaft, respectively.

10. The system of claim 9 wherein said bar, shaft and recesses all have a cross-sectional polygon configuration, with the configuration of the recess receiving said bar matching the configuration of said bar and the configuration of the recess receiving said shaft matching the configuration of said shaft in order to couple torque from said bar to said shaft.

11. The system of claim 5, further including a pilot drill projecting downwardly from the lower end of said auger, said pilot drill having a through-bore aligned with the through-bore of said auger to allow said ground rod to pass through said pilot drill when said ground rod is released by said fastener.

12. A method of installing ground rods, comprising:

placing said ground rod in a central bore in an elongated rigid shaft and in an auger fixedly secured to one end of said shaft;

placing said auger against the ground and rotating said shaft in one direction, thereby causing said auger to draw said shaft into the ground; and

rotating said shaft in the opposite direction while allowing said ground rod to fall downwardly through the central bore in said auger, whereby said shaft and auger are withdrawn from the ground, leaving only said ground rod embedded in the ground.

13. The method of claim 12, further including the step of securing said ground rod to said shaft until said auger has been rotated to substantially its maximum depth.