EP0269668B1 - Dispositif d'anti-blocage pour scies a chaine - Google Patents

Dispositif d'anti-blocage pour scies a chaine Download PDF

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Publication number
EP0269668B1
EP0269668B1 EP87903350A EP87903350A EP0269668B1 EP 0269668 B1 EP0269668 B1 EP 0269668B1 EP 87903350 A EP87903350 A EP 87903350A EP 87903350 A EP87903350 A EP 87903350A EP 0269668 B1 EP0269668 B1 EP 0269668B1
Authority
EP
European Patent Office
Prior art keywords
balls
chain
chain guide
orifices
plates
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP87903350A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0269668A1 (fr
Inventor
Gaétan Bruccheri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0269668A1 publication Critical patent/EP0269668A1/fr
Application granted granted Critical
Publication of EP0269668B1 publication Critical patent/EP0269668B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/02—Chain saws equipped with guide bar
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/08—Accessories for keeping open the saw kerf, e.g. riving knives or wedge plates

Definitions

  • the present invention relates to an anti-lock device for chain saws.
  • This safety device relates in particular to portable, thermal, electric chainsaws, etc. These tools, depending on the power of their engine and the length of their guide bars, are used to cut firewood (logs, small logs) , for pruning, felling, etc.
  • a blockage of the chain due to a side pinch following the bending of the piece of wood in the cutting plane, can damage the engine or cause an accident.
  • the guide bar receives very significant efforts from the logs, the sawn parts of which tend to approach and press the guide bar, which leads to overheating of the engine or the projection of the piece of wood, with the imbalance that this entails for the user. This imbalance is the cause of many accidents.
  • the present invention aims to remedy these drawbacks.
  • the invention as characterized in the claims, solves the problem of creating a device making it possible to permanently maintain the flanges of the guide bar at a distance from the sides of the cutting line corresponding to the offset of the teeth of the saw to eliminate any risk of blockage.
  • the anti-blocking device for chain saws according to the invention is mainly characterized in that the chain guide comprises a central core and two chain guide flanges and in that the bearings consist of ball bearings whose balls protrude on each side of the chain guide by a height corresponding to the external offset of the chain teeth relative to the external side of the chain guide flanges.
  • the balls are arranged in staggered rows, in two rows, on each side of the chain guide, alternately on either side.
  • the balls are retained laterally in orifices, with a diameter slightly greater than that of the balls, drilled in the central core, bear against the inside of one of the flanges and protrude outside the guide bar by holes drilled in the other flange.
  • the balls bear against the inner side of one of the flanges by means of semi-spherical cups hollowed out in said flange and are held captive by the edge of the holes drilled in the other flange.
  • the edge of the orifices allowing the balls to protrude outside the chain guide has a semi-spherical shape with a radius slightly greater than that of the balls.
  • the anti-blocking device makes it possible, during the pruning of tree branches, where cutting difficulties arise, not to tighten the chain each time cutting, since, during cutting, when the chain is going to open and when the edges of the cut come closer, the balls absorb the forces and retransmit them to the flanges, in a balanced way, avoiding blocking, while facilitating the movement of the saw in the cutting plane, since the central core, flanges and balls assembly behaves like a thrust bearing.
  • FIGS. 2 and 3 represent an anti-blocking device for chain saws comprising a central core 1, two chain guide flanges 2 and 3 and balls 4, projecting outside the flanges 2 and 3.
  • the balls 4 housed in orifices la arranged in the central core 1 are supported in semi-spherical cups 2a and 3a arranged on the internal side of the chain guide flanges and protrude outside by orifices 2b and 3b arranged in the opposite flange.
  • the protrusion of the balls 4 on the outside corresponds to the external offset of the teeth of the chain 5, taking account of the cut clearance.
  • the balls 4 projecting from a height X are alternated on either side of the flanges 2 and 3 so that, during cutting, the balls 4 absorb the clamping forces F transmitted by the sides 6a and 6b of the cutting line of the piece of wood 6 and directly transfer these to the flanges 2 and 3, in a balanced manner while allowing the slide ment of the assembly in the saw cut, since said balls 4 remain free to rotate despite their stress.
  • the balls 4 are staggered on each flange 2 and 3, along the longitudinal periphery of the central core 1.
  • the chain saw, equipped with this device is presented as a ball stop in which the sides 6a and 6b of the piece of wood behave like the plates of the stop, and the central core 1, as well as the chain guide flanges 2 and 3 as the bearing ball cage.
  • the anti-blocking device according to the invention is intended mainly to facilitate the use, by non-professionals, of portable chainsaws, by ensuring them the best safety conditions.
EP87903350A 1986-06-02 1987-06-01 Dispositif d'anti-blocage pour scies a chaine Expired - Lifetime EP0269668B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8608152A FR2599292B1 (fr) 1986-06-02 1986-06-02 Dispositif d'anti-blocage pour scies a chaine
FR8608152 1986-06-02

Publications (2)

Publication Number Publication Date
EP0269668A1 EP0269668A1 (fr) 1988-06-08
EP0269668B1 true EP0269668B1 (fr) 1990-05-09

Family

ID=9336059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87903350A Expired - Lifetime EP0269668B1 (fr) 1986-06-02 1987-06-01 Dispositif d'anti-blocage pour scies a chaine

Country Status (6)

Country Link
US (1) US4825553A (ja)
EP (1) EP0269668B1 (ja)
JP (1) JPS63503450A (ja)
AU (1) AU7510787A (ja)
FR (1) FR2599292B1 (ja)
WO (1) WO1987007556A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035058A (en) * 1990-07-09 1991-07-30 Suehiro Seiko Kabushiki Kaisha Chain saw guide bar
US7631430B2 (en) * 2007-01-29 2009-12-15 Li-Shua Chang Guide bar for a chain saw
EP1950015A1 (en) 2007-01-29 2008-07-30 Li-Chua Chang Guide bar for chain saws
US7818886B1 (en) 2007-04-25 2010-10-26 Matthew Wade Grindstaff Anti-pinch chainsaw bar assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740965C (de) * 1939-11-19 1943-11-01 Eduard Nowak Holzbearbeitungsmaschine mit umlaufend angetriebener Fraeskette
US4334112A (en) * 1978-10-05 1982-06-08 Union Carbide Corporation Process for producing 2,5-dichloro-p-xylene

Also Published As

Publication number Publication date
FR2599292B1 (fr) 1991-10-04
EP0269668A1 (fr) 1988-06-08
JPS63503450A (ja) 1988-12-15
AU7510787A (en) 1988-01-11
FR2599292A1 (fr) 1987-12-04
WO1987007556A1 (fr) 1987-12-17
US4825553A (en) 1989-05-02

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