• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Provided is a tree shear head of a type including a main frame to which a pair of blade support arms are attached for pivotal movement about an axis orientated so as to extend generally perpendicular to a tree being cut. A pair of arcuate platelike blades are respectively fixed to the arms, the respective curvatures of the blades being such that the blades lie along the respective paths that they trace about the pivot axis of the arms during operation. The blades have respective cutting edges extending parallel to the pivot axis of the arms and are movable with the arms between an open position, wherein the cutting edges are spaced apart for receiving a tree to be sheared therebetween and a closed position, wherein the blades are slightly overlapped. Relative to the pivot axis of the blade support arms, the cutting edge of each of the blades is formed by inner and outer converging planar surfaces which respectively extend outwardly and inwardly from inner and outer parallel arcuate surfaces of the blade. The inner and outer plananr surfaces of each blade are dimensioned such that the area of the inner planar surface is less than the area of the outer planar surface, the planar surfaces being so angled relative to a radius line emanating from the center of curvature of the blades that as the cutting edge advances to a position between the open and closed positions thereof during shearing of a standing tree, the vertical reacting forces exerted on the blade will be balanced.
    公开号:SU961545A3
    申请号:SU752123701
    申请日:1975-04-10
    公开日:1982-09-23
    发明作者:Клинтон Джонсон Эрл
    申请人:Диир Энд Компани (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the forest industry and can be used in forest machines. The purpose of the invention is to reduce the cutting effort. FIG. 1 shows a tree cutting device, front view; in fig. 2 is a diagram of vertical forces acting on four types of knives when they are inserted into a tree trunk, calculated on a computer; in fig. 37 - knife designs; in fig. 8 is a diagram of the vertical forces acting on a knife when cutting a trunk 14 inches (355 mm). The tree cutting device includes arcuate knives 1, each of which has a cutting edge formed by intersecting the upper 2 and lower 3 faces. The preferred ratio of the areas of the top and bottom faces is 0.3; face 2 forms an angle 67 AOR with the radius emanating from the axis of rotation of the knives, and face 3 forms an angle of 112 ° 30 with the same radius. Knives can be made with different angles of inclination of the faces and their relative position. . Curves 4-7 diagrams correspond to knives 8-11. The knife 8 has the angles of inclination of the faces, as in a knife, but the ratio of the areas of the faces is: 1.0. Curve 4 shows that the forces acting on the upper edge are not compensated by the force acting. on the lower edge to reach the cutter with the edge of the middle of the barrel. The maximum unbalanced force reaches a value of more than 34,000 pounds (15.4 tons) after inserting a knife into the body by about 3.5 inches (about 87 mm). At knife 9, the area-to-top ratio of the bottom area is 0.5. Corresponding to it, curve 5 shows that the vertical downward force exerted on the knife exceeds 29,000 pounds (13 tons), arises when cutting knives into the tree trunk 1.5 inches (38 mm). Inversion of force occurs when the cutting edge reaches 1.5 inches from the center of the barrel. In the knife 10, the ratio of the areas of the vertex of the face to the lower is taken to be 0.67, and the angle of inclination of the lower face to the plane parallel to the radial one is 120 °. Curve 6 shows that the maximum vertical force is 20,000 pounds (9 tonnes) when inserting a knife into the barrel by 2 inches (51 mm). In this case, the force inversion occurs when the cutting edge is located 2.5-3 inches (64-76 mm) from the center of the tree. The knife 11 is made with an aspect ratio equal to 0.43 and the slope of the edges is the same as that of the knife 10. Curve 7 shows that the maximum downward force for this knife is 14,000 pounds (6.3 tonnes) and occurs when the knives pierce 1.5 inches deep (29 mm). The maximum upward force is 27,000 pounds (12.2 tons) and occurs at a point 0.5 inches (12.7 mm) from the center of the barrel. Inversion force occurs at a point remote from the center of the barrel by 4.5 inches (114 mm). Practice shows that the average diameter of trees to be cut is 12-14 inches (305-356 mm), while the device is designed to cut trees with a diameter of 18 inches (457 mm). Based on the conditions of the trunk diameter of 14 inches (356 mm), the equal angles of inclination of curve 7 at points 7 inches (178 mm) from the center of the trunk, curve 12 was obtained for the knife. Curve 12 shows that The blade for the knife is 11,000 pounds (0.45 tonnes) and occurs at a point 3.5 inches (89 mm) from the center of the tree. Immediately before reaching the cutting edge of the center of the tree, the knife perceives the maximum upward force of 3000 pounds (, 36 tons), and the inversion of force occurs at a point remote from the center of the trunk by 1 inch (25.4 mm). The cutting edges of the knife 1 are similar to the cutting edges of the knife P. Since the knives are attached to the levers by welding, their ends are slightly directed upwards. When cutting a tree, the curve 12 shown is unbalanced or squeezed the knives in a straight direction. Therefore, the knives are shaped in such a way that, for any character, the swaths are subjected to minimal bending.
    9 6
    6 5 S
    1 o
    FIG. 2
    Phie, 7,
    ovtf
    Fmg.6
    权利要求:
    Claims (2)
    [1]
    1. DEVICE FOR CUTTING TREES, including two rotary arcuate knives with formed intersection of the upper and lower faces with cutting edges located towards each other, characterized in that, in order to reduce cutting forces by stabilizing the knife when it moves along a given curved path, the area ratio the upper face to the area of the lower face is from 0.15 to 0.5, the angle formed by the upper face of the knife with a plane passing through the apex of the angle between the faces and a parallel radial plane passes giving through the axis of rotation of the knives is equal to 67 ° 30, and the angle formed by the lower face with the specified plane is 112 ° 3θ'-120 °.
    [2]
    2. The device according to π. 1, cast in that the ratio of the area of the upper face to the area of the lower face is 0.3.
    SRIE. 1 ζ ©
    Joint venture
    4·*
    Joint venture
    类似技术:
    公开号 | 公开日 | 专利标题
    KR860008822A|1986-12-18|Positive Slowaway Tip
    SU961545A3|1982-09-23|Device for cutting trees
    ES277020U|1984-07-01|Cutting apparatus.
    SU448619A1|1974-10-30|Tree cutter
    GB1477942A|1977-06-29|Rocking action plate shear
    US2090228A|1937-08-17|Pruner or like tool
    US3721245A|1973-03-20|Pair of surgical scissors
    US4689884A|1987-09-01|V-snip scissors
    US4399726A|1983-08-23|Cutting device
    US2250638A|1941-07-29|Metal shears
    US3951188A|1976-04-20|Tree de-limber
    US2914851A|1959-12-01|Shingle cutter
    US4913203A|1990-04-03|Tree harvester
    US547264A|1895-10-01|Scissors or shears
    KR860000130A|1986-01-25|All-around offset type cutting shears with full width pre-cutter
    SU1500201A1|1989-08-15|Garden pruner
    SU1380672A1|1988-03-15|Pruner
    US4131145A|1978-12-26|Tree cutting device
    US4644652A|1987-02-24|Lopper with bypassing blades
    SU1752171A3|1992-07-30|Pruner
    US224148A|1880-02-03|Lamp-wick trimmer
    US34042A|1861-12-24|Improvement in saw-gummers
    US4069848A|1978-01-24|Tree shearing device
    SU1444097A1|1988-12-15|Hand shears
    CA1045362A|1979-01-02|Tree harvesting blade
    同族专利:
    公开号 | 公开日
    NO137256C|1978-02-01|
    FR2267184A1|1975-11-07|
    FI53770B|1978-05-02|
    SE419395B|1981-08-03|
    FI53770C|1978-08-10|
    FI751046A|1975-10-11|
    CA1004959A|1977-02-08|
    DE2513274A1|1975-10-23|
    AU7133674A|1976-01-22|
    DE2513274B2|1976-03-18|
    SE7503719L|1975-10-13|
    US3888287A|1975-06-10|
    FR2267184B1|1977-04-15|
    NO137256B|1977-10-24|
    NO751215L|1975-10-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3461929A|1967-07-25|1969-08-19|Beloit Corp|Deep snow butt shear apparatus|
    US3540501A|1969-06-23|1970-11-17|Brundell & Jonsson Ab|Means for cutting trees|
    FI46670C|1972-01-13|1975-01-27|Tyoetehoseura R Y|Tree cutting device in particular for felling growing trees.|
    US3808909A|1973-04-04|1974-05-07|Deere & Co|Collapsible link for a tree shear|
    US3826295A|1973-04-26|1974-07-30|Deere & Co|Felling head structure|CA980664A|1974-03-26|1975-12-30|Her Majesty In Right Of Canada As Represented By The Minister Of The Dep Artment Of The Environment|Tree cross-cutting blade|
    CA1054491A|1976-04-26|1979-05-15|Joseph Coatta|Tree shearing device|
    EP0339261B1|1988-04-27|1992-12-23|Diaber Ag|Device for uncovering the reinforcement rods in concrete piles|
    US5044409A|1989-12-08|1991-09-03|Hamilton Douglas D|Force matching tree shear|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US459538A|US3888287A|1974-04-10|1974-04-10|Blade for tree shear having vertically swingable blade support arms|
    [返回顶部]