WO2005099981A1 - Tronçonneuse a chaine - Google Patents

Tronçonneuse a chaine Download PDF

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Publication number
WO2005099981A1
WO2005099981A1 PCT/EP2005/003870 EP2005003870W WO2005099981A1 WO 2005099981 A1 WO2005099981 A1 WO 2005099981A1 EP 2005003870 W EP2005003870 W EP 2005003870W WO 2005099981 A1 WO2005099981 A1 WO 2005099981A1
Authority
WO
WIPO (PCT)
Prior art keywords
saw
chain
protective
brake
motor
Prior art date
Application number
PCT/EP2005/003870
Other languages
German (de)
English (en)
Inventor
Werner Harrer
Karl Neumann
Original Assignee
Werner Harrer
Karl Neumann
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 Werner Harrer, Karl Neumann filed Critical Werner Harrer
Publication of WO2005099981A1 publication Critical patent/WO2005099981A1/fr

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
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/083—Devices for arresting movement of the saw chain

Definitions

  • the invention relates to a hand-held motor chain saw which has a housing which is provided with a rear handle and an upper retaining bracket, carries a pivotable safety bracket and contains a drive motor and which carries a saw blade projecting forward with an all-round saw chain which is connected to an over the safety bracket operable chain brake is coupled.
  • a hand-held motor chain saw which has a housing which is provided with a rear handle and an upper retaining bracket, carries a pivotable safety bracket and contains a drive motor and which carries a saw blade projecting forward with an all-round saw chain which is connected to an over the safety bracket operable chain brake is coupled.
  • cut protection clothing the pants of which cover the front leg area and narrow strips of the side leg area. Plastic inserts are incorporated into this cut-resistant clothing, which are broken down into long fibers when they come into contact with the high-speed saw chain and which should block the saw chain in a split second or at least significantly delay the cutting through of the clothing.
  • the object of the invention is to provide a motor chain saw with an additional protective device, which protects an operator against serious injuries even with insufficient protective clothing.
  • a motor chain saw of the type mentioned which has a cut contact monitor which triggers the chain brake when the operator comes into contact with the saw chain or the saw bar.
  • the cut contact monitor comprises a protective circuit fed by a protective extra-low voltage current source, which contains an evaluation circuit which monitors its electrical resistance and, if the resistance falls below a predetermined threshold, an evaluation circuit which is coupled to the chain brake and which preferably actuates the electromechanical triggering device
  • Motor chainsaw can be electrically connected to each other through contact with the operator.
  • the front protective section is electrically conductively connected to the saw chain or saw blade.
  • the rear protective section is connected in an electrically conductive manner to the regions of the rear handle and the upper retaining bracket that are electrically insulated from the housing by the operator.
  • the rotating saw chain is stopped via the cut contact monitor as soon as the operator comes into contact with the saw chain or the saw blade. This prevents the circular saw chain from penetrating deeper into the operator's body. This protection of the operator is independent of whether the operator wears cut protection clothing or not. Even if she only wears electrically insulating shoes and detects the motor chain saw on the rear handle and on the upper bracket with bare hands, the cut contact monitor according to the invention is fully functional. , The training according to the invention reduces the risk of serious and fatal injuries when working with the motor chain saw.
  • a measuring section connected to an optical and / or acoustic display can be provided in the rear protective section for measuring the electrical resistance present between the rear handle and the upper retaining bracket.
  • the cut contact monitor can comprise a test section which is electrically connected to both protective sections and can be closed by a test button and has an electrical test resistor which simulates unwanted physical contact. With this training, the functionality of the cut contact monitor can be checked before using the motor chain saw. When the test button is pressed, the cut contact monitor must trigger the chain brake.
  • the protective circuit is operated with a protective extra-low voltage in which touching the live parts of the protective circuit is harmless to the operator.
  • FIG. 1 shows a motor chain saw with cut contact monitor
  • FIG. 2 shows an evaluation circuit for the cut contact monitor
  • FIG. 3 shows a further embodiment of a motor chain saw with cut contact monitor.
  • Fig. 1 shows schematically a motor chain saw with housing 1, rear handle 2, upper bracket 3, upper hand guard 4 and saw blade 5 protruding towards the front with rotating saw chain 6.
  • the drive motor housed in the housing 1 is actuated via the gas lever 7 attached to the rear handle 2 ,
  • the drive motor drives the saw chain 6 via its drive pinion 8.
  • the hand protection 4 for the upper bracket 3 is formed by the upper end of a pivotable safety bracket 9, with which the band brake 10 coupled to the drive pinion 8 can be triggered, which then stops the saw chain 6 in a split second.
  • the band brake 10 sees a brake bell 11 rigidly connected to the drive pinion 8 before, which is wrapped by a steel band 12 which is tightened by the brake spring 13 acting on its movable end on the brake bell 11 to stop it.
  • the steel strip 12 is held in its state lifted from the brake bell 11 by the release device 14 engaging at its movable end, and the release device 14 absorbs the tensioning force transmitted from the brake spring 13 to the steel strip 12.
  • the safety bar 9 is pivotally mounted at its lower end in the housing 1. It is mechanically coupled to the release device 14 via a toggle lever mechanism. This engages with the lower member 15a of its toggle lever on a piston 16 rigidly connected to the movable end of the steel strip 12.
  • the upper link 15b of the toggle lever is articulated on the safety bracket 9 above its lower pivot bearing.
  • the piston 16 is arranged axially displaceably in a guide link 17 rigidly connected to the housing 1 and is acted upon on the rear side by the brake spring 13 arranged in the guide link 17.
  • the motor chain saw is equipped with a cut contact monitor.
  • This comprises a protective circuit powered by a protective extra-low voltage power source, which is subdivided within the motor chain saw into a front protective section and a rear protective section which is electrically separated therefrom.
  • the saw chain 6 and the saw blade 5 are electrically conductively connected to the front protective section.
  • the areas of the rear handle 2 and the upper bracket 3 which are to be grasped by hand by the user of the motor chain saw are electrically insulated from the housing 1 and are connected in an electrically conductive manner to the rear protective section.
  • the two protective sections are connected to an evaluation circuit which measures the electrical resistance and, when falling below a defined resistance threshold, triggers the release device 14 of the chain brake via a triggering device 23 coupled to the safety bracket 9.
  • the user holds the chain saw with his hands on the rear handle 2 and on the upper bracket 3. As a result, it is permanently connected to the rear protective section in an electrically conductive manner. If he slips with the saw blade 5 and his body comes into contact with the rotating saw chain 6, he short-circuits the two protective sections with his body. Due to the electrical conductivity of the human body, the electrical resistance drops below a defined resistance threshold and the evaluation circuit actuates the release device 14 of the band brake 10 via the trigger device 23.
  • FIG. 2 shows an embodiment of an evaluation circuit for the cut contact monitor.
  • the circuit is designed so that it can be supplied with a unipolar DC voltage source.
  • the structure of the circuit prevents false tripping immediately after the supply voltage is applied.
  • the clamp 20 is electrically connected to the rear protection section and the clamp 21 is electrically connected to the front protection section.
  • a protective extra-low voltage is provided as the supply voltage between points 21 and 22 of the circuit. This is supplied by a generator, the voltage of which is rectified and smoothed accordingly.
  • the generator is driven by the engine of the motor chain saw designed as an internal combustion engine.
  • the generator output voltage is rectified and smoothed.
  • the protective extra-low voltage can be provided from the electrical voltage source of the electric motor via a power supply unit.
  • the capacitor V is used to suppress false trips caused by electrostatic discharges caused by touching the rear handle 2 and the upper bracket 3.
  • the resistor 2 ' represents a high-resistance connection to the positive pole 22 (+ U) of the supply voltage (“pull-up” resistor). In normal operation, the terminal 20 is therefore at potential + U.
  • the electrical resistance of his body creates a low-resistance connection to terminal 21 compared to resistor 2 'and the potential of terminal 20 drops. If the potential of terminal 20 falls below the potential of the "-" connection of comparator 5', the latter jumps Output voltage from + U to 0V.
  • the potential of the "-" connection of the comparator 5 ' which determines the sensitivity or response threshold of the error detection, is determined by the ohmic voltage divider 3' and 4 '.
  • This voltage divider can be designed as a potentiometer, which sets the sensitivity of the protection If the output voltage of comparator 5 'jumps from + U to 0V, capacitor 8' charges via resistor 7 'and diode 6' charges to + U. Charging capacitor 8 'reduces the potential of the "- "Connection from the comparator 12 '. If this potential falls below the potential of the "+" connection of comparator 12 ', the output voltage of comparator 12' jumps from 0V to + U Switching element 13 ', e.g. B.
  • 3 shows a motor chain saw according to the invention, in which a test section 26 is provided which is electrically connected to both protective sections and which contains an electrical test resistor 27 which simulates body contact and can be closed by a test button 28. By pressing the test button 28, the two protective sections of the protective circuit are electrically connected to one another via the test resistor 27, so that the evaluation circuit triggers the band brake 10 via the electromechanical release device 23.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne une tronçonneuse à chaîne qui comprend un carter (1) qui est équipé d'une poignée arrière (2) et d'un étrier de maintien supérieur (3), qui porte un étrier de sécurité pivotant (9), qui contient un moteur d'entraînement et qui porte une lame de scie (5) faisant saillie vers l'avant et comprenant une chaîne de sciage rotative (6) qui est accouplée à un frein de chaîne (10) actionnable au moyen de l'étrier de sécurité (9). Un dispositif de contrôle de contact coupant électronique, alimenté par une basse tension de sécurité, comprend un circuit d'évaluation et un dispositif de déclenchement (23), de préférence électromécanique, actionnable par le circuit d'évaluation et couplé au frein de chaîne (10). Ce dispositif de contrôle comprend deux segments de protection séparés, reliés de manière électroconductrice à la chaîne de sciage (6) et à la lame de scie (5) ou à la poignée arrière (2) et à l'étrier de maintien supérieur (3). Lorsque l'utilisateur touche avec son corps les deux segments de protection, le circuit d'évaluation et le dispositif de déclenchement (23) mettent en action le frein de chaîne (10).
PCT/EP2005/003870 2004-04-14 2005-04-13 Tronçonneuse a chaine WO2005099981A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6442004 2004-04-14
ATA644/2004 2004-04-14

Publications (1)

Publication Number Publication Date
WO2005099981A1 true WO2005099981A1 (fr) 2005-10-27

Family

ID=34964808

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/003870 WO2005099981A1 (fr) 2004-04-14 2005-04-13 Tronçonneuse a chaine

Country Status (1)

Country Link
WO (1) WO2005099981A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105210690A (zh) * 2015-08-12 2016-01-06 宁波大叶园林设备有限公司 一种有对数螺线凸轮机控有刷电机刹停的锂电链锯

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556643A1 (fr) * 1983-12-20 1985-06-21 Stempniakowski Tonny Detecteur electronique de contact de securite
FR2570017A2 (fr) * 1983-12-20 1986-03-14 Tony Stempniakowski Detecteur electronique de contact de securite
DE9000157U1 (fr) * 1990-01-09 1990-09-27 Breidenbach, Bernd, 6342 Haiger, De
NL9301542A (nl) * 1993-09-06 1995-04-03 Nedap Nv Beveiliging voor handbediende electrische of electro-mechanische apparaten.
US6420974B1 (en) * 1998-09-18 2002-07-16 Honeywell Data Instruments Inc. Control system for pressure-sensitive protective devices
FR2831476A1 (fr) * 2001-10-26 2003-05-02 Jean Pierre Loubes Dispositif de securite pour outil de coupe manuel motorise

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556643A1 (fr) * 1983-12-20 1985-06-21 Stempniakowski Tonny Detecteur electronique de contact de securite
FR2570017A2 (fr) * 1983-12-20 1986-03-14 Tony Stempniakowski Detecteur electronique de contact de securite
DE9000157U1 (fr) * 1990-01-09 1990-09-27 Breidenbach, Bernd, 6342 Haiger, De
NL9301542A (nl) * 1993-09-06 1995-04-03 Nedap Nv Beveiliging voor handbediende electrische of electro-mechanische apparaten.
US6420974B1 (en) * 1998-09-18 2002-07-16 Honeywell Data Instruments Inc. Control system for pressure-sensitive protective devices
FR2831476A1 (fr) * 2001-10-26 2003-05-02 Jean Pierre Loubes Dispositif de securite pour outil de coupe manuel motorise

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105210690A (zh) * 2015-08-12 2016-01-06 宁波大叶园林设备有限公司 一种有对数螺线凸轮机控有刷电机刹停的锂电链锯

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