Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G23/00—Forestry
  • A01G23/02—Transplanting, uprooting, felling or delimbing trees
  • A01G23/06—Uprooting or pulling up trees; Extracting or eliminating stumps
  • A01G23/067—Uprooting or pulling up trees; Extracting or eliminating stumps by comminuting the tree stumps

Definitions

• This invention relates to a device for extracting and/or disintegrating piece materials, the device comprisin a -base with two or three arms, one or two of which are movable, one movable arm cooperating with one fixed or one movable arm and at least one of the cooperating arms being arcuate with its concave portion facing the other coopera ⁇ ting arm-
• Such piece ' materials which can be treated by means of the device of the invention include materials which can be recovered, such as big objects on refuse or scrap dumps, e.g. refrigerators and the like,, but specifically wood waste, and above all stumps. At stump extracting on a large scale for utilization of stump wood it is of a great im ⁇ portance that the stumps are .
• the gripping and splitting device consists of a hydrpulically operated, very thick and relatively blunt steel plate . , which is pressed in between two counter supports to carry out splitting.
• the steel plate is very thick to resist the lateral breaking effects normally occuring when splitting stumps. •
• the most essential disadvantages if this known devic 3 is, - except that it is very heavy and works too slowly - that the splitting device requires very- great forces when splitting stump wood and that the bluntness of the splitting device also causes considerable wood losses in the form of splintered and crushed wood which is lost in a following wood cleaning process. Now it has been found possible to reduce wood losses to a considerable extent and to reduce the force required for the splitting.
• the device of the invention which is characterized in that two cooperating arms are provided w ⁇ ith fixed or replaceable knives cooper- ating with each other and fixed during the disintegration in a plane of motion in such a way that at least one of them is provided with a groove adapted to receive a por ⁇ tion of the other cooperating arm intended for this in order to guide the arms and the knives, respectively. relative to each other.
• the device can be suspended on the front of a forest engine running on wheels nr bands or in a crane jib(b om) of such a wood engine. ⁇ .Then carrying " ut splitting Cdisint.e- gration)it is of a great importance that the splitting means (knives) are as sharp as possible so that smooth section surfaces are obtained and wood losses are mini ⁇ mized in this way.
• splitting stumps it is suitable to cam- out the cut through the central ⁇ ortion nf the stump parallelly to the direction of the fibers; thanks to thi- ⁇ essentially less force is required for cleaving (splitting) the stump wood.
• the arms are usually hydraulically operated and one arm is preferably shaped as a hook with an extended and reinforced outer portion (lower portion) on the very hook to achieve a contact surface to the ground intended for use in stump extraction.
• the hook end can be shaped as a fork but is preferably made in the form of a tip which can be removed or replaced. It is suitable that either, or above all., both these tips are made in the fcrm of a wedge (axe) so that these tips can be used in cleaving (breaking) .
• this device can comprise a base, on which a hydrauli- cally operated knife is movably attached, which knife works against another knife (counter knife) .
• the extension of the movable knife slides into a guide at the movement of the knife, the edge of the knife being retained after the knife nose has entered the guide, in a plane of motion common to the counter knife independently of the fact if the material to be split lies perpendicularly to the knives or not.
• the knife nose is thus preferably formed like a wedge penetrating the stump before the knives are brought into engagement.
• a hook-shaped arm (the lower leg) is projected as a tip to facilitate penetration of the arm under a stump
• this tip is also preferably formed like a wedge, both wed ⁇ ges penetrating into the stump from each their direction, which facilitates breaking (cleaving) of the stump.
• both arms_ar.e movable i.e. also the counter knife is movable.
• the knives are preferably straight, their grinding (sharpening) being easier.
• the knives can be. divided into .two or more straight lengths which form angles between themselves. They are preferably arranged so that the knife edges-form a concave line against the knife edges of a cooperating arm. In principle . , there is ho ever nothing that prevents the knives from being curved, and also in this case ' the curvature is arranged so that the indicated concavity is provided.
• the invention provides for a device for extracting and disintegrating a piece material; particularly stumps, compri ⁇ -i-ng a base with two cooperating pivotable arms, movable substantially in the same, common plane of motion, the end of each arm being provided with ah wedge-shaped tip adapted to cleave the stump.
• the device shown in Figs. 3 and 4 for extracting and/or disintegration especially stumps comprises a base 1 j hydraulically operated (4., 12) arms 5, 11 ncvably attached to the base 1 , one arm 5 being somewhat curved and carrying knives 9 ⁇ vorking against counter knives 7
• the device When used at extracting and/or splitting stumps the device can either be operated in a direction away from th ⁇ * supporting device (wood engine or the-like) against the stump or towards the supporting device and the stump.
• th ⁇ * supporting device wood engine or the-like
• the tip 10 of the arm 11 is first pressed in under the stump, which can be facilitated by the pressure plate S being alternatively pressed against the ground so that a leverage is obtained.
• the introduction of the device under the stump is also facilitated hy the nose 5 of the am 3 being pressed against the stu ⁇ p by the hydraulic means 4.
• the device can then be operated by the hydraulic means so that the tip 10 is entered almost horizontally to the stump from one of its sides, after w r hich the stump is split by means of the wedge of the nose tip 13 and the knives 9. Finally the stump parts are broken up from the ground in the manner described- After extracting the stump portions or the whole stump the extracted parts can be further split by the aid of the knives 9 and 7.
• the essential parts of the device illustrated in Figs. 6 and 7 are the base 1 with the pivotically movable arms 5, 11 having wedge shaped tips 10, 13 which can be replaceable.
• the tips are provided with sharp edges to cleave the stumps.
• the tip are preferably made of steel. It is possible to dispense with the guiding groove 6 and the knives on the concave portion of the arms.

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• Life Sciences & Earth Sciences (AREA)
• Biodiversity & Conservation Biology (AREA)
• Ecology (AREA)
• Forests & Forestry (AREA)
• Environmental Sciences (AREA)
• Shovels (AREA)

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• 1981
  • 1981-06-26 EP EP19810902003 patent/EP0082140A1/de not_active Withdrawn
  • 1981-06-26 WO PCT/SE1981/000189 patent/WO1983000079A1/en unknown

Non-Patent Citations (1)

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