WO1995021715A1 - Chain saw file angle guide - Google Patents

Chain saw file angle guide Download PDF

Info

Publication number
WO1995021715A1
WO1995021715A1 PCT/SE1995/000122 SE9500122W WO9521715A1 WO 1995021715 A1 WO1995021715 A1 WO 1995021715A1 SE 9500122 W SE9500122 W SE 9500122W WO 9521715 A1 WO9521715 A1 WO 9521715A1
Authority
WO
WIPO (PCT)
Prior art keywords
file
chain saw
collet
tang
chain
Prior art date
Application number
PCT/SE1995/000122
Other languages
French (fr)
Inventor
Hans Himbert
Original Assignee
Sandvik Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sandvik Ab filed Critical Sandvik Ab
Priority to EP95909187A priority Critical patent/EP0743886A1/en
Publication of WO1995021715A1 publication Critical patent/WO1995021715A1/en
Priority to FI963113A priority patent/FI963113A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
    • B23D63/08—Sharpening the cutting edges of saw teeth
    • B23D63/16—Sharpening the cutting edges of saw teeth of chain saws
    • B23D63/162—Sharpening the cutting edges of saw teeth of chain saws by a reciprocating or rotating rod-like sharpening tool, e.g. file, grinding cylinder

Definitions

  • Saw chains with chipper or chisel cutting links are sharpened by filing with a round file.
  • the file is held at a certain angle to the transverse direction of the saw chain and the guide bar. This angle varies between different chain types and different tree species, but is commonly between 25 and 40 degrees.
  • file handles which include means to indicate a proper angle of filing. Since saw chains are made from hard and often chrome plated material, a chain saw file wears rapidly, and usually the handle is not discarded with the file but used to hold the next chain saw file. It is thus made with tightenable jaws and not adjustable to different angles.
  • the chain saw file is held with a unitary file handle such as used for larger mill files with tapering rectangular tangs by means of a plastic collet which also indicates the proper filing angle.
  • figure 1 showing the collet from above
  • figure 2 showing the collet from the side
  • figure 3 showing the collet from the rear.
  • the collet has a rear tang part (10) shaped like the tang of a mill file, of equal thickness seen from the side and tapering seem from above, and a front part with two wings
  • the front end has a thickened portion (16) between the wings
  • the collet tang (10) may be made with one or more lengthwise slits to make it more compressible when pushed into the file handle (15) .
  • the front edges of the wings (11,12) forms such an angle with the hole (13) that the intended filing angle is achieved when the front edge of a wing is parallel to the chain being filed.
  • Each wing can be made with a different angle, and in such case the wings should carry identification marks (17) telling either the angle or the type of chain requiring that angle.
  • the collet is preferably made from a flexible plastic material to get the desired wedging action when pushed into the handle (15) , but it could also be made from thin spring steel, pressed into corresponding shape.
  • the collet is so small that it is possible to carry several collets along with the files, and exchanging the collet to choose another angle of filing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Knives (AREA)

Abstract

Collet for attaching a cylindrical chain saw file to a file handle made to fit a tapering rectangular file tang and for indicating a desired angle between the chain saw file and a saw chain being filed, comprising a rear tang part (10) with an outline like a tapering rectangular file tang, a lengthwise hole (13) with a cross section corresponding to the chain saw file and at least one wing (11, 12) with a front edge forming the desired angle with the hole.

Description

CHAIN SAW FILE ANGLE GUIDE Background
Saw chains with chipper or chisel cutting links are sharpened by filing with a round file. In order to get best cutting properties, it is required that the file is held at a certain angle to the transverse direction of the saw chain and the guide bar. This angle varies between different chain types and different tree species, but is commonly between 25 and 40 degrees.
To help the operator hold the file at the desired angle, there are several filing guides available, such as described in the patents US 4,177,697, US 4,404,871 and 4,228,702 but must of those are too complicated or too fragile to be used in the woods, and they are not readily adjustable to other angles.
There are also known designs of file handles which include means to indicate a proper angle of filing. Since saw chains are made from hard and often chrome plated material, a chain saw file wears rapidly, and usually the handle is not discarded with the file but used to hold the next chain saw file. It is thus made with tightenable jaws and not adjustable to different angles.
According to the invention the chain saw file is held with a unitary file handle such as used for larger mill files with tapering rectangular tangs by means of a plastic collet which also indicates the proper filing angle.
Description
The invention is described with reference to figure 1 showing the collet from above, figure 2 showing the collet from the side, and figure 3 showing the collet from the rear.
CONFIRMATION The collet has a rear tang part (10) shaped like the tang of a mill file, of equal thickness seen from the side and tapering seem from above, and a front part with two wings
(11,12) . Through the length of the collet is a hole (13) with a cross-section corresponding to that of a chain saw file (14) , which can be pushed into the hole. When the collet is then pushed into a file handle (15) designed to fit mill files, the collet tang (10) is compressed to hold the chain saw file (14) firmly.
The front end has a thickened portion (16) between the wings
(11,12) to hold the file properly, forming a step (18) to the rear to aid in prying the collet loose from the handle
(15) when the file is worn out. The collet tang (10) may be made with one or more lengthwise slits to make it more compressible when pushed into the file handle (15) .
The front edges of the wings (11,12) forms such an angle with the hole (13) that the intended filing angle is achieved when the front edge of a wing is parallel to the chain being filed. Each wing can be made with a different angle, and in such case the wings should carry identification marks (17) telling either the angle or the type of chain requiring that angle.
The collet is preferably made from a flexible plastic material to get the desired wedging action when pushed into the handle (15) , but it could also be made from thin spring steel, pressed into corresponding shape. The collet is so small that it is possible to carry several collets along with the files, and exchanging the collet to choose another angle of filing.

Claims

1. Collet for attaching a cylindrical chain saw file to a file handle made to fit a tapering rectangular file tang, and for indicating a desired angle between the chain saw file and a saw chain being filed, c h a r a c t e r i z e d in comprising a rear tang part (10) with an outline like a tapering rectangular file tang, a lengthwise hole (13) with a cross section corresponding to the chain saw file and at least one wing (11,12) with a front edge forming the desired angle with the hole (13) .
2. Collet according to claim 1, c h a r a c t e r i z e d in having two wings (11,12) with front edges forming different angles with the hole (13) .
3. Collet according to claim 2, c h a r a c t e r i z e d in having a rearward facing step (17) between the wings to aid in prying the collet loose from the handle (15) .
PCT/SE1995/000122 1994-02-09 1995-02-08 Chain saw file angle guide WO1995021715A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95909187A EP0743886A1 (en) 1994-02-09 1995-02-08 Chain saw file angle guide
FI963113A FI963113A (en) 1994-02-09 1996-08-07 Controls for a file saw's file angle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9400420-7 1994-02-09
SE9400420A SE502436C2 (en) 1994-02-09 1994-02-09 File control with fixed angles for saw chains

Publications (1)

Publication Number Publication Date
WO1995021715A1 true WO1995021715A1 (en) 1995-08-17

Family

ID=20392859

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/000122 WO1995021715A1 (en) 1994-02-09 1995-02-08 Chain saw file angle guide

Country Status (4)

Country Link
EP (1) EP0743886A1 (en)
FI (1) FI963113A (en)
SE (1) SE502436C2 (en)
WO (1) WO1995021715A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR851759A (en) * 1939-03-17 1940-01-15 Handle for files, screwdrivers and similar tools
DE720809C (en) * 1940-10-29 1942-05-16 Otto Leisten File handle
US2795034A (en) * 1956-08-23 1957-06-11 Joseph O Forgette File handle
US3407466A (en) * 1966-08-29 1968-10-29 Granberg Elof File guide handle
US4633552A (en) * 1985-03-26 1987-01-06 Eriksson Karl E S Tool handle with eccentric tool gripping assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR851759A (en) * 1939-03-17 1940-01-15 Handle for files, screwdrivers and similar tools
DE720809C (en) * 1940-10-29 1942-05-16 Otto Leisten File handle
US2795034A (en) * 1956-08-23 1957-06-11 Joseph O Forgette File handle
US3407466A (en) * 1966-08-29 1968-10-29 Granberg Elof File guide handle
US4633552A (en) * 1985-03-26 1987-01-06 Eriksson Karl E S Tool handle with eccentric tool gripping assembly

Also Published As

Publication number Publication date
FI963113A0 (en) 1996-08-07
SE502436C2 (en) 1995-10-16
SE9400420D0 (en) 1994-02-09
SE9400420L (en) 1995-08-10
FI963113A (en) 1996-08-07
EP0743886A1 (en) 1996-11-27

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