Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
  • B27L7/00—Arrangements for splitting wood
  • B27L7/02—Arrangements for splitting wood using rotating members, e.g. rotating screws
  • B27L7/04—Conical screws

Definitions

• the present invention relates to a device of a new type, intended to be used for splitting logs or similar pieces of wood.
• a tree When a tree is felled, it is known to cut it with a chainsaw, to obtain logs of firewood.
• these logs are generally too large to be able to be arranged as such in the hearth of a fireplace. We are therefore led to split them and this operation generally constitutes hard work.
• the known means (use of a mass, of metal corners, or of an ax) oblige to carry out this operation in the open air, in any case far from the chimney of use. In particular, this practically prohibits carrying out these operations in the city or in an apartment.
• the present invention relates to a device of a new type, capable of being used on site by an individual, the force work being transformed into a simple operation which can be carried out in an apartment.
• a device is in the form of a light portable device, controlled by an electric motor, and characterized in that it comprises:
• the lower edge of the corner forms with the geometric axis of the threaded cone, an acute angle which widens downwards, while the end of the edge of the corner which is closest to the rotating cone, ends in close proximity to the threaded surface of the latter.
• the lower end of the edge of the fixed corner extends downward, further than the lower point of the threaded cone, the distances being appreciated parallel to the direction of the geometric axis of the cone.
• the base is surmounted by a cover and a handle, if the entire device is presented in the manner of a portable device of electric tools.
• the casing of the device contains an electric gear motor driving the threaded cone in rotation.
• the fixed base comprises, under its lower part a fixed push shoe placed next to the periphery of the rotary cone, in the zone where the tangential speed of the latter is oriented in the direction which moves away from the fixed corner. In other words, if the threaded cone turns "to the right", the fixed push shoe is located on its left, when for the user looking at the device from top to bottom, the corner is located towards the rear.
• Figure 1 is a side view with partial section of a device according to the invention.
• Figure 2 is a schematic perspective view.
• Figure 3 shows the fixed corner, considered in isolation.
• Figure 4 shows the lateral push shoe, considered in isolation.
• Figures 5 to 7 are side views illustrating the operation of the apparatus for starting to split a log.
• Figures 8 and 9 are views of its rear part illustrating the end of the operation, when the lateral thrust shoe really separates the pieces of the log, even if it is a very fibrous wood.
• the device illustrated in the drawings comprises a base 1, surmounted by a cover 2, provided with a handling handle 3. At the front, this handle is preferably equipped with a push button 4, actuating in the ma known, an electric switch not shown.
• an electric geared motor 5 which, by means of an endless screw 6, and a toothed ring 7, drives in rotation around its vertical geometric axis 8, a cone of revolution 9, provided on its periphery, a large module thread.
• the tip 10 of the rotating cone 9 is directed downwards.
• a metal wedge 11 is also fixed, provided at its lower part with a tapered rectilinear edge 12, oriented from bottom to top, in the direction of the cone 9.
• the edge 12 ends in a heel 13, preferably rounded.
• a spout 14 located in the immediate vicinity of the periphery of the cone 9, for example at the lower third of its length.
• the lower heel 13 of the edge 12 of the corner 11 is located at a level 15, placed below the tip 10 of the cone 9.
• the corner 11 has approximately the general shape of a tetrahedron whose rear face 15 has the shape of a curvilinear triangle which, at its upper part, is more flared than the rotating cone 9 , while at its lower part, its tapered shape corresponds to an angle at the top less than that of the tip 10 of the rotary cone 9.
• the rotary cone 9 turns "to the right", that is to say clockwise as shown diagrammatically in FIG. 2, by arrow 16.
• a fixed push shoe 17 is fixed on its left under the base 1. This shoe has the shape illustrated in Figures 1 and
• the operation is as follows: The problem is to split a log 21
• the fixed corner 11 has a blade, comprising, as previously, the oblique upper edge 12, but this extends downwards through the cutting edge 17 slightly inclined towards the rear and downwards, ending in a cutting edge 29 with a convex profile towards the front.
• this edge 29 bears against the end cut 30 of the log 21, which allows the device to be lowered pra without tipping, as the cone 9 sinks into the log 21.
• the entire wedge 11 then constitutes a sharp knife of length greater than that of the rotary cone 9.
• This last variant facilitates the splitting of a log of great length (for example more than one meter).

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Debarking, Splitting, And Disintegration Of Timber (AREA)
• Milling, Drilling, And Turning Of Wood (AREA)

Priority Applications (7)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9285555

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (1)

Citations (4)

• 1983
  • 1983-01-28 FR FR8301662A patent/FR2540031B1/fr not_active Expired
• 1984
  • 1984-01-30 JP JP59500700A patent/JPS60500330A/ja active Pending
  • 1984-01-30 WO PCT/FR1984/000020 patent/WO1984002870A1/fr active IP Right Grant
  • 1984-01-30 EP EP84900621A patent/EP0134802B1/fr not_active Expired
  • 1984-01-30 DE DE8484900621T patent/DE3463739D1/de not_active Expired
  • 1984-09-18 FI FI843633A patent/FI843633L/fi not_active Application Discontinuation
  • 1984-09-27 NO NO843874A patent/NO843874L/no unknown
  • 1984-09-27 DK DK463584A patent/DK463584D0/da not_active Application Discontinuation

Patent Citations (4)

Also Published As

Similar Documents

Legal Events