US4557409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical grounding rod driving device
Assignee: E and J Demark Inc
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Filing: 1984-03-19
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Granted: 1985-12-10
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Expires: 2004-03-19
Abstract
Abstract The present invention is a double-headed hammer slidingly encompassing a ground rod driving shaft having a single anvil affixed thereto which can be selectively engaged by either hammer. The driving shaft has a recess in each end to receive the grounding rod, depending upon whether the action is to initiate and continue the insertion of grounding rod into the ground or to complete the insertion of the rod in accordance with the provisions of the Code. The present invention does not require the operator to take a position above the ground or to use any other instrument to make the complete and proper insertion of the grounding rod into the ground.
Inventors
- 👤 J. Edwin Hecock
- 👤 James O. Mumper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:22
CPC Classifications
B; B25; B25D; B25D1/00; B25B; B25B27/00; B25B27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
An electrical grounding rod driving device comprising an elongated cylinder having a hammer secured within each end portion and encompassing a ground rod receiving and driving shaft having a single anvil affixed to one end thereof within said cylinder and having opposing striking surfaces for selective engagement by the striking face of either hammer, the driving shaft having a recess in each end for selective engagement of one end of said rod, and means to lock said cylinder and said shaft in non-operable position.
Claim 2
Dependent Claim
84 words
An electrical grounding rod driving device comprising an elongated cylinder having a hammer secured within each end portion and encompassing a ground rod receiving and driving shaft having a single anvil affixed to one end thereof within said cylinder and having opposing striking surfaces for selective engagement by the striking face of either hammer, the driving shaft having a recess in each end for selective engagement of one end of said rod, and means to lock said cylinder and said shaft in non-operable position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |