Patent US3874432A successfully refreshed from Google Patents.
US3874432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tree harvesting apparatus
Assignee: AL ALBRIGHT Inc
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Filing: 1973-06-12
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Granted: 1975-04-01
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Expires: 1993-06-12
Abstract
Abstract A rectangular saw bar is pivotally mounted in a hollow anvil having a rectangular base and a forward projection in extension of a side of said base. The saw bar is adapted to pivot from wholly within said base to partially into said projection which receives therewith a cutting run of a chain saw mounted for rotation around the saw bar. A wedge is mounted on the saw bar for tilting large trees, said wedge extending oppositely but parallel to the cutting run side. A pusher is pivoted to a bracket fixed at the intersection of the base and projection and adapted to pivot from a horizontal position covering an open end of said base to an upright position normal to said projection. A pusher bar is rigidly fixed on the pusher at its free end to extend normal thereto and parallel to said projection. A plurality of gripper rings with sharpened and tapering peripheries are mounted concentrically on the pusher bar, which in combination engage engage a standing tree when the pusher is pivoted upward, thereby uncovering the open end of said base for the pivoting of the saw bar and chain saw to cut the tree. The pusher bar pushes the tree, as it is cut, in the same direction as the wedge as it enters the cut being made, thus felling the tree when severed clear of the machine and operator.
Inventors
- 👤 Alva Z Albright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:50
CPC Classifications
A; A01; A01G; A01G23/00; A01G23/02; A01G23/08; A01G23/091; Y; Y10; Y10S; Y10S83/00; Y10S83/928; Y10T; Y10T83/00; Y10T83/707; Y10T83/7101; Y10T83/7108
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
325 words
Improved tree harvesting apparatus for use with a power train having an auxiliary power supply, said apparatus having a hollow anvil with a rectangular base and a projection adjacent a side thereof which extends normal to said base in a common horizontal plane, the Angle therebetween being defined by open sides, and said apparatus comprising: a modified rectangular saw bar, having oppositely disposed leading and back edges and opposite ends, pivotally mounted in said base by a pivot defined adjacent said leading edge and one of said opposite ends, for pivoting in said common horizontal plane from wholly within said base to partially into said projection through said open sides and the right angle therebetween, said saw bar defining at the other of said opposite ends a stop and lock extending normal to said leading edge and conformed in shape to a free end of the projection for limiting movement of said saw bar therein, said saw bar also having a wedge fixed on the back edge thereof and parallel to said leading edge for providing a wedging action therewith; a chain saw mounted for rotation around said saw bar with a cutting run on the leading edge thereof as it pivots from said base into said projection; pusher means pivotally mounted on said base adjacent intersection with said projection for pivoting from a parallel position therewith to an upright positionadjacent said projection to thereby bias a tree positioned between said base and projection toward said projection; actuating means operatively connected to said auxiliary power supply and mounted respectively adjacent said saw bar, pusher means and chain saw for respectively pivoting said saw bar, pusher means and rotating said chain saw aroind the saw bar; and power control means mounted in said power train and on said hollow anvil and connected between said auxiliary power supply and the actuating means for the coordinated application of the power supply to said actuating means to fell trees.
Claim 2
Dependent Claim
325 words
Improved tree harvesting apparatus for use with a power train having an auxiliary power supply, said apparatus having a hollow anvil with a rectangular base and a projection adjacent a side thereof which extends normal to said base in a common horizontal plane, the Angle therebetween being defined by open sides, and said apparatus comprising: a modified rectangular saw bar, having oppositely disposed leading and back edges and opposite ends, pivotally mounted in said base by a pivot defined adjacent said leading edge and one of said opposite ends, for pivoting in said common horizontal plane from wholly within said base to partially into said projection through said open sides and the right angle therebetween, said saw bar defining at the other of said opposite ends a stop and lock extending normal to said leading edge and conformed in shape to a free end of the projection for limiting movement of said saw bar therein, said saw bar also having a wedge fixed on the back edge thereof and parallel to said leading edge for providing a wedging action therewith; a chain saw mounted for rotation around said saw bar with a cutting run on the leading edge thereof as it pivots from said base into said projection; pusher means pivotally mounted on said base adjacent intersection with said projection for pivoting from a parallel position therewith to an upright positionadjacent said projection to thereby bias a tree positioned between said base and projection toward said projection; actuating means operatively connected to said auxiliary power supply and mounted respectively adjacent said saw bar, pusher means and chain saw for respectively pivoting said saw bar, pusher means and rotating said chain saw aroind the saw bar; and power control means mounted in said power train and on said hollow anvil and connected between said auxiliary power supply and the actuating means for the coordinated application of the power supply to said actuating means to fell trees.
Claim 3
Dependent Claim
105 words
Improved harvesting apparatus as described in claim 1 wherein said pusher means comprises: an elongated structure, angular in cross-section, pivoted to said base with a depending side adapted to cover said open side of said base when said pusher means is in horizontal position; a pusher bar mounted on the free end of said pusher means and normal thereto for engaging a tree positioned in the right angle between said base and projection as the pusher means rise to an upright position; and gripper rings mounted in spaced concenticity on said pusher bar for engaging tree against falling in the direction of its unsupported side.
Claim 4
Dependent Claim
102 words
Improved harvesting apparatus as described in claim 1 wherein said rectangular saw bar comprises: reinforcing plates mounted on edges adjoining said leading edge of said rectangular saw bar for strengthening said saw bar and in combination with said wedge mounted on another edge strengthens said saw bar for supporting a cut tree; and a lock in combination with said stop and mounted therewith normal to said leading edge of the rectangular saw bar and adapted to enter the free end of the projection with said stop for tieing said harvesting apparatus together against piecemeal damage during the falling of a cut tree.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |