Patent US3697115A successfully refreshed from Google Patents.
US3697115A
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Log grapple
Assignee: Esco Corp
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Filing: 1971-01-25
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Granted: 1972-10-10
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Expires: 1991-01-25
Abstract
Abstract A log grapple of the fixed tong pin type wherein the tongs have a reverse curvature in their confronting surfaces.
Inventors
- 👤 Keith E La Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:06
CPC Classifications
B; B66; B66C; B66C3/00; B66C3/14; B66C3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A grapple for logs comprising a headpiece having means for securement to a lifting mechanism, a first pair of spaced-apart pivots on said headpiece, a second pair of spaced-apart pivots on said headpiece between the pivots of said first pair, a tong mounted on each of said second pivots and having an inwardly directed end remote from said second pivot, and a cylinder and piston rod unit mounted on each of said first pivots and operatively connected to a tong, each tong being generally vertically elongated and having a generally outwardly arcuate contour in the lower part of the surface confronting the other tong and a generally inwardly arcuate contour in the upper part of said surface, the mounting of said tongs on said second pivots being offset so as to overlap said tongs in closing whereby said generally inwardly arcuate contours develop a downward wedging action supplemental to the upward pinching-wedging action developed by the generally outwardly arcuate contours.
Claim 2
Dependent Claim
160 words
A grapple for logs comprising a headpiece having means for securement to a lifting mechanism, a first pair of spaced-apart pivots on said headpiece, a second pair of spaced-apart pivots on said headpiece between the pivots of said first pair, a tong mounted on each of said second pivots and having an inwardly directed end remote from said second pivot, and a cylinder and piston rod unit mounted on each of said first pivots and operatively connected to a tong, each tong being generally vertically elongated and having a generally outwardly arcuate contour in the lower part of the surface confronting the other tong and a generally inwardly arcuate contour in the upper part of said surface, the mounting of said tongs on said second pivots being offset so as to overlap said tongs in closing whereby said generally inwardly arcuate contours develop a downward wedging action supplemental to the upward pinching-wedging action developed by the generally outwardly arcuate contours.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |