EP0269668A1 - Dispositif d'anti-blocage pour scies a chaine. - Google Patents
Dispositif d'anti-blocage pour scies a chaine.Info
- Publication number
- EP0269668A1 EP0269668A1 EP87903350A EP87903350A EP0269668A1 EP 0269668 A1 EP0269668 A1 EP 0269668A1 EP 87903350 A EP87903350 A EP 87903350A EP 87903350 A EP87903350 A EP 87903350A EP 0269668 A1 EP0269668 A1 EP 0269668A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- balls
- chain guide
- flanges
- chain
- orifices
- 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.)
- Granted
Links
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 a device 1 anti-lock for chain saws.
- This safety device relates in particular to portable, thermal, electric, etc. chainsaws. These tools, depending on the power of their engine and the length of their chain guide, 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 chain guide takes very great efforts from the logs, the sawn parts of which tend to approach and press the chain guide, which causes the engine to overheat or the projection of the piece of wood with the imbalance that this causes for the user. This imbalance is the cause of many accidents.
- the anti-blocking device aims to remedy these drawbacks.
- This device for chain saws as characterized in the claims, solves the problem of creating a simple and effective anti-blocking safety guide, easily adaptable to all types of chain saws having a central core and two flanges serving as a chain guide.
- the anti-blocking device for chain saws according to the invention is caradt_ériseprincipalement in that it consists of balls protruding outside the chain guide flanges of a height corresponding to the external offset of the chain teeth, taking into account the cutting clearance.
- the balls are similar to those used in ball bearings.
- the protruding balls are arranged alternately on either side of the flanges, are housed in orifices. Of diameter slightly greater than that of the balls, arranged in the central core, bear on the inside of a flange and protrude outside through an opening in the other flange.
- the balls are supported on the inside of a flange by means of semi-spherical cups hollowed out in the said flange, and are held captive by the edge of the orifices made in the chain guide flanges to allow them to protrude from the 'outside.
- the diameter of the balls is determined so that their projecting part is adjacent to the cutting plane established by the saw: that is to say, the height of this projecting part corresponds to the offset of the teeth of the saw towards the outside , taking into account the cutting clearance which allows the cutting chains to be used up to the maximum of their sharpening.
- the orifices arranged in the flanges to allow the protrusion of the balls on the outside, are staggered on each flange by marrying the inner periphery of the central core, and alternately, on either side.
- the orifices allowing the balls to project outside are of concave spherical shape with a radius slightly greater than that of the balls.
- the anti-blocking device makes it possible, during pruning of branches of trees, where cutting difficulties are manifested. Not to tighten the chain with each cut.
- FIG. 1 shows a cross-sectional view of the chain guide in operation, devoid of the anti-blocking device according to the invention.
- FIG. 2 shows a cross-sectional view of the chain guide in operation, equipped with the device according to the invention.
- FIG. 3 shows a partial side view of the anti ⁇ blocking device according to the invention.
- FIGS. 2 and 3 show an anti-blocking device for chain saws comprising a central core 1, two chain guide flanges 2 and 3 and balls 4 protruding outside the flanges 2 and 3.
- the balls 4 housed in the orifices arranged in the central core 1 are supported in spherical cups i 2a and 3a arranged on the internal side of the chain guide flanges 2 and 3 and protrude outside through orifices 2b and 3-b 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 al ⁇ tarnished on either side of the flanges 2 and 3 so that when the balls are cut 4 absorb the clamping forces F transmitted by the sides 6a and 6b of the cutting line of the piece of wood 6 and transfer these directly to the flanges 2 and 3 in a balanced manner while allowing the sliding of the 'together 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 thrust ball in which the sides 6a and 6b of the piece of wood behave like the plates of the thrust, and the central core 1, as well as the chain guide flas ⁇ 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.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
Description
Claims
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 true EP0269668A1 (fr) | 1988-06-08 |
EP0269668B1 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 (fr) |
EP (1) | EP0269668B1 (fr) |
JP (1) | JPS63503450A (fr) |
AU (1) | AU7510787A (fr) |
FR (1) | FR2599292B1 (fr) |
WO (1) | WO1987007556A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5035058A (en) * | 1990-07-09 | 1991-07-30 | Suehiro Seiko Kabushiki Kaisha | Chain saw guide bar |
EP1950015A1 (fr) | 2007-01-29 | 2008-07-30 | Li-Chua Chang | Guide-chaîne pour scies à chaînes |
US7631430B2 (en) * | 2007-01-29 | 2009-12-15 | Li-Shua Chang | Guide bar for a chain saw |
US7818886B1 (en) | 2007-04-25 | 2010-10-26 | Matthew Wade Grindstaff | Anti-pinch chainsaw bar assembly |
Family Cites Families (2)
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 |
-
1986
- 1986-06-02 FR FR8608152A patent/FR2599292B1/fr not_active Expired - Lifetime
-
1987
- 1987-06-01 AU AU75107/87A patent/AU7510787A/en not_active Abandoned
- 1987-06-01 JP JP62503377A patent/JPS63503450A/ja active Pending
- 1987-06-01 EP EP87903350A patent/EP0269668B1/fr not_active Expired - Lifetime
- 1987-06-01 US US07/162,319 patent/US4825553A/en not_active Expired - Fee Related
- 1987-06-01 WO PCT/FR1987/000189 patent/WO1987007556A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO8707556A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU7510787A (en) | 1988-01-11 |
US4825553A (en) | 1989-05-02 |
FR2599292A1 (fr) | 1987-12-04 |
FR2599292B1 (fr) | 1991-10-04 |
JPS63503450A (ja) | 1988-12-15 |
EP0269668B1 (fr) | 1990-05-09 |
WO1987007556A1 (fr) | 1987-12-17 |
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Legal Events
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