Patent US3817303A successfully refreshed from Google Patents.
US3817303A
Expired / Lapsed
US
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Tree crosscutting device, in particular for felling growing trees
Assignee: Individual
•
Filing: 1973-01-10
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Granted: 1974-06-18
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Expires: 1993-01-10
Abstract
Abstract A tree crosscutting device, in particular for felling growing trees, for attachment to a tractor or equivalent, having two cutting bits which enter the wood from opposite directions, urged by attached action means. The bits are turnably mounted on the body structure of the device, and the invention is particularly characterized in that their turning axis is common to both and parallel with the principal straight line passing through the opposite extreme points of their cutting edges, and carried in a journalling pivot. Furthermore, the cutting bits are shaped to conform to part of a double cone, the central axis of which coincides with said turning axis. Thereby, the cutting edge presents a V-shaped ridge, which promotes the splitting of the tree stump and reduces the penetration resistance of the cutting bits. Additional, optional characteristics specify various details concerning the geometry of the cutting bits and their V-ridge. A wedge, additional to the cutting bits proper, is also specified and described in some detail, as well as details of the cutting bit holders and of the journalling arrangements associated with the common axis of the cutting bits.
Inventors
- 👤 P Saarinen
- 👤 M Kantola
- 👤 P Haataja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:49
CPC Classifications
A; A01; A01G; A01G23/00; A01G23/02; A01G23/08; A01G23/087; A01G23/089
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
Tree crosscutting device, in particular for felling growing trees, comprising a body structure which is attached to an articulated or telescopic jib of a tractor or universal machine, two cutting bits with cutting edges entering the wood from opposite directions, which cutting bits have been connected with said body structure to be turnable by means of power means about a turning axis, which is parallel with the principal straight line passing through the opposite extreme points of said cutting edges, characterized in that both cutting bits are turnable about one and the same turning axis, in a journalling pivot, and that the cutting bits have such shape that they are located on a part of the mantle of a double cone having its central axis coincident with said turning axis, whereby substantially at the centre of the cutting bits a V-shaped ridge transversal to the cutting edge is formed, which promotes the splitting of the stump when a growing tree is being felled, thus reducing the penetration resistance of the cutting bits.
Claim 2
Dependent Claim
172 words
Tree crosscutting device, in particular for felling growing trees, comprising a body structure which is attached to an articulated or telescopic jib of a tractor or universal machine, two cutting bits with cutting edges entering the wood from opposite directions, which cutting bits have been connected with said body structure to be turnable by means of power means about a turning axis, which is parallel with the principal straight line passing through the opposite extreme points of said cutting edges, characterized in that both cutting bits are turnable about one and the same turning axis, in a journalling pivot, and that the cutting bits have such shape that they are located on a part of the mantle of a double cone having its central axis coincident with said turning axis, whereby substantially at the centre of the cutting bits a V-shaped ridge transversal to the cutting edge is formed, which promotes the splitting of the stump when a growing tree is being felled, thus reducing the penetration resistance of the cutting bits.
Claim 3
Dependent Claim
29 words
Tree crosscutting device according to claim 1, characterized in that on the cutting bits the angle formed by said V-shaped ridge is in the range from 90* to 160*.
Claim 4
Dependent Claim
34 words
Tree crosscutting device according to claim 1, characterized in that said V-shaped ridge is perpendicular to the cutting edge of the cutting bits, and that said V-ridge meets the edge substantially at its centre.
Claim 5
Dependent Claim
40 words
Tree crosscutting device according to claim 1, characterized in that in connection with said V-ridge a wedge has been affixed, having the purpose of promoting the splitting of the stump and reducing the wood penetration resistance of the cutting bit.
Claim 6
Dependent Claim
26 words
Tree crosscutting device according to claim 4, characterized in that the wedge is pyramidally narrowing in the direction towards the cutting edge of the cutting bit.
Claim 7
Dependent Claim
38 words
Tree crosscutting device according to claim 1, characterized in that the cutting bits have been mounted in bit holders having cut-outs substantially shaped like a circular segment for the part of the cutting bits penetrating into the wood.
Claim 8
Dependent Claim
72 words
Tree crosscutting device according to claim 1, characterized in that the cutting bits have been affixed by mediation of bit holders to flanges, to one of which a shaft central to the turning axis has been affixed, upon which shaft there is a sleeve affixed to the other flange, upon which sleeve there is a sleeve forming a journal and which has been affixed to the body structure of the crosscutting device.
References Cited (Backward Citations)
US1509994A
Cited
US3294131A
Cited
US3461929A
Cited
US3540501A
Cited
US3690353A
Cited
US3720248A
Cited
US3720249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |