Tree harvesting method and device
First Claim
1. A tree harvesting method for limbing and bucking a standing tree by means of a harvesting device moved by a skidder or a corresponding carrier comprising:
- severing an upper part of a tree from a lower butt portion thereof;
limbing and bucking the thus-severed upper part of the tree while maintaining said upper part of the tree in an upright attitude and before the tree is severed at the lower butt portion thereof; and
securing the harvesting device tightly to the lower butt portion of the tree during the said limbing and bucking procedure so that at least a part of the pressure against the harvesting device is transferred to the lower butt portion of the tree during limbing and bucking of the severed upper part of the tree.
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Abstract
In a tree harvesting method particularly suitable for selective logging, the upper part of a tree will be limbed and bucked into logs by means of a harvesting device before the tree is severed at the butt. During the limbing and bucking procedure, the harvesting device will be secured tightly to the lower part of the tree so that the pressure against the device is transferred to this lower part and thus no massive support carrier is needed for the harvesting device. The upper part of the tree can be bucked, after it has been severed from the lower part, by lowering it in upright position the length of a log at a time to the side of the lower part and by severing each log thereof at the height of the upper end of the lower part. The convenient height of the lower part of the tree corresponds approximately to the length of a log.
27 Citations
10 Claims
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1. A tree harvesting method for limbing and bucking a standing tree by means of a harvesting device moved by a skidder or a corresponding carrier comprising:
- severing an upper part of a tree from a lower butt portion thereof;
limbing and bucking the thus-severed upper part of the tree while maintaining said upper part of the tree in an upright attitude and before the tree is severed at the lower butt portion thereof; and
securing the harvesting device tightly to the lower butt portion of the tree during the said limbing and bucking procedure so that at least a part of the pressure against the harvesting device is transferred to the lower butt portion of the tree during limbing and bucking of the severed upper part of the tree.
- severing an upper part of a tree from a lower butt portion thereof;
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2. A tree harvesting method for limbing and bucking a standing tree by means of a harvesting device moved by a skidder or a corresponding carrier comprising:
- limbing and bucking the upper part of the tree before the tree is severed at the butt; and
securing the harvesting device tightly to the lower part of the tree during said limbing and bucking procedure so that at least a part of the pressure against the harvesting device is transferred to the lower part of the tree, the upper part of the tree being bucked into logs, after it has been severed from the lower part of the tree, by lowering it in upright position the length of a log at a time to the side of the lower part of the tree and by severing each log thereof at the height of the upper end of the lower part of the tree. - View Dependent Claims (3)
- limbing and bucking the upper part of the tree before the tree is severed at the butt; and
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4. A tree harvesting device moved by a skidder or a corresponding carrier and adapted to limb a standing tree and to buck it into logs, comprising a body;
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support and clamp means for securing the body of the device tightly to a lower part of the standing tree; a severing device connected to an upper end of the body of the harvesting device and mounted at a height that corresponds approximately to the length of a log; clamp and limbing means to support and limb the upper part of the tree and an arm on which said clamp and limbing means is located and which can rotate about a vertical axis and move upwards and downwards in relation to the body of the harvesting device; and a severing device connected to said support and clamp means. - View Dependent Claims (5)
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6. In a tree harvesting device which is adapted to be moved by a skidder or a corresponding carrier to a tree which is to be worked on for limbing and bucking a standing tree, in combination:
- a body;
limbing and bucking means carried by said body for severing an upper part of a tree from a lower part thereof, for then guiding the severed upper part of the tree for downward movement, and for limbing and bucking the upper part of the tree before the tree is severed at the butt thereof and while said upper part remains in an upright attitude; and
means for securing said body tightly to the lower part of the tree during operation of said limbing and bucking means at the severed, upright upper part of the tree, so that at least part of the pressure against said body is transferred to the lower part of the tree. - View Dependent Claims (7, 8, 9, 10)
- a body;
Specification