EP2447022B1 - Dispositif de frein de chaîne pour une scie à chaîne entraînée par air comprimé - Google Patents

Dispositif de frein de chaîne pour une scie à chaîne entraînée par air comprimé Download PDF

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Publication number
EP2447022B1
EP2447022B1 EP10189385A EP10189385A EP2447022B1 EP 2447022 B1 EP2447022 B1 EP 2447022B1 EP 10189385 A EP10189385 A EP 10189385A EP 10189385 A EP10189385 A EP 10189385A EP 2447022 B1 EP2447022 B1 EP 2447022B1
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EP
European Patent Office
Prior art keywords
chain
compressed air
saw
brake
braking
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.)
Active
Application number
EP10189385A
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German (de)
English (en)
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EP2447022A1 (fr
Inventor
Simon Witt
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.)
Spitznas Maschinenfabrik GmbH
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Spitznas Maschinenfabrik GmbH
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Publication date
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Priority to PL10189385T priority Critical patent/PL2447022T3/pl
Priority to EP10189385A priority patent/EP2447022B1/fr
Publication of EP2447022A1 publication Critical patent/EP2447022A1/fr
Application granted granted Critical
Publication of EP2447022B1 publication Critical patent/EP2447022B1/fr
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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
    • B27B17/08—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 method for braking a motorized chainsaw, with compressed air driven chain drive, through which the saw chain is driven.
  • chainsaws are used for the mentioned fields of application that do not require an electric drive or an internal combustion engine.
  • These chainsaws use a pneumatic drive. With compressed air, a pneumatic motor of the chain saw is driven.
  • the chain saws have a braking device that engages when a trigger mechanism is actuated.
  • the compressed air-driven drive is connected to a brake drum.
  • the brake drum is looped around by a brake band.
  • the trigger mechanism is activated, the brake band becomes The DE 3232775 A1 describes, for example, a braking device for braking the saw chain of a portable motor chain saw.
  • the motor chain saw has a sensor that responds when a dangerous condition occurs.
  • the senor is formed as in a spin movement of the saw with a hand of the saw guide on the housing of the chain saw rotatably held hand protection lever.
  • a friction brake is actuated which acts on a drum connected to the drive sprocket of the chain saw.
  • the friction brake is provided with a safety device which actuates the friction band brake even when an uncontrolled acceleration of the revolving saw chain occurs.
  • the DE 3316899 A1 discloses a chainsaw with a housing. On the case a handle is mounted. A motor is received in the housing, with a cutting chain having a housing extending from the extending bearing rail for supporting the cutting chain for endless movement. The chain saw further has a drive connection with the motor, which is provided with a rotation transmission device for driving the cutting chain. A safety brake device serves to stop the cutting chain. In this case, the safety brake device has a sensor arm pivotally mounted on the housing. A part of the feeler arm lies in front of the handle during operation of the chain saw. The feeler arm is movable from a first position to a second position.
  • a flexible brake band secured to the housing at a first end and coupled to the projection at a second end such that upon movement of the sensor arm from the first position to the second position, the flexible brake band is displaced from a position free of the rotational transmission device a friction-braking relationship is moved with the rotation transmission device.
  • the DE 3419152 A1 describes a Kettenbremsvornchtung for actuating a spring-loaded brake for devices with a drive motor, in particular motor chain saw.
  • the chain brake device in this case has a trigger, which is connected to a tensioning and braking member, wherein the braking member is disposed on a braking band surrounding a brake drum.
  • a latching device is held against the force of an attacking brake spring in a standby position, in the brake band is lifted from the brake drum, and in which the clamping member in the braking position of the brake member in the path of movement of a driver can be brought.
  • a safety brake system for a chain saw is disclosed.
  • a pivotable member which has a spaced apart from the lower end portion of a brake lever of a brake handle arm.
  • the handle is pivotally mounted on a front handle and is actuated by the brake lever when it is pivoted.
  • An arm of a fork of the pivotable member is connected to one end of a brake band, which is looped over the outer periphery of a clutch drum of a centrifugal clutch.
  • the chainsaw is driven, while the other arm of the fork is prevented by a locking lever on a pivoting movement.
  • Chainsaws with pneumatic drive are already marketed under the product designations Chainsaw 510210020, 510220020 and 510230020 by the applicant.
  • the field of application varies from underwater use, plastic cutting to mining.
  • These chainsaws have a braking system, such as described above.
  • Disadvantage of the known brake systems for pneumatic chain saws is that the braking behavior is relatively slow. This jeopardizes the safety of the legendary leader in unfortunate circumstances.
  • the EP 0018603 discloses machines, in particular a chainsaw, which are operated with compressed air.
  • the saw chain is driven by a pneumatic chain drive.
  • Compressed air control means support the braking process for the saw chain.
  • the disadvantage with this braking device is that it does not react fast enough
  • the object is also achieved by a method of the type mentioned above for braking a motor-driven chainsaw, in which the compressed air supply is controlled for braking, wherein the compressed air supply is reversed.
  • the braking effect is caused solely by the friction brake.
  • the friction brake acts at the moment of triggering directly against the compressed air drive. This increases the wear of the brake. It always has to work against the drive.
  • the compressed air supply is controlled when triggered. For example, the compressed air supply can be reduced. The appropriate control of the compressed air flow both in quantity, as well as flow direction can greatly assist the braking effect of a pneumatic chain saw.
  • the compressed air control means are designed as a breaker valve. Often it is sufficient for the compressed air-driven chainsaws to prevent the driving compressed air with a stroke. Between the compressed air drive and the compressed air supply, an interrupter valve is arranged. By triggering the breaker valve, the further inflow of compressed air is prevented. Thus, the friction brake is no longer working against the compressed air drive. The temporal braking behavior of the chainsaw is considerably shortened.
  • the embodiment of the invention is that the compressed air control means cause a reversal of the direction of the compressed air.
  • the direction of the compressed air is changed, so that the compressed air-driven drive experiences a kind of thrust reversal.
  • This ensures that the friction brake not only works against the compressed air, but is considerably supported by the compressed air.
  • the control means must thus be designed so that the drive can change direction. Both direction reversal and interruption of compressed air can be used in combination. Because it may be necessary that initially the direction of the compressed air for the drive is reversed. Finally, in order to prevent the chain from also moving in the opposite direction, it is necessary to interrupt the supply of compressed air by means of the interrupting valve. The direction reversal of the compressed air can or should therefore be limited in time.
  • a preferred embodiment of the invention is also that the compressed air control means are actuated by a triggering device.
  • a triggering device Especially in emergencies, it is necessary that the chain saw chain stops immediately to avoid major accidents.
  • a system must be present, which actuates the brake means directly.
  • the triggering device may for example contain a sensor, such as an acceleration sensor, which registers extraordinary changes in direction and directly actuates the brake device of the chain saw.
  • the triggering device is therefore coupled to a triggering mechanism for triggering the braking means.
  • the triggering mechanism is preferably formed mechanically, so as not to cause any danger.
  • the triggering mechanism then includes a mechanical brake lever, wherein the brake lever is provided as a hand guard. In an emergency, the saw driver can brake the saw by hand by activating the hand guard to release the brake.
  • the braking means are biased. Due to the bias, which is generated for example by springs, the friction brake is applied extremely quickly to the brake drum.
  • the brake means comprise a brake band, which wraps around the brake drum.
  • Brake bands are not only easy to implement in assembly and production, they are also extremely lightweight, insensitive and easy to maintain.
  • the compressed air control means are designed as a breaker valve. Again, the interruption of the supply for the compressed air prevents the braking effect of the friction brake works against the compressed air.
  • the embodiment of the motorized chainsaw according to the invention is that the compressed air control means cause a reversal of direction of the compressed air direction.
  • the direction of the compressed air is changed in order to pressurize the compressed air-driven drive with a force against the previous direction. This causes a braking effect on the direction reversal.
  • a friction brake is supported if necessary considerably by this measure.
  • the compressed air supply is interrupted. At the moment when the compressed air supply is interrupted, the chain saw powered by compressed air is no longer driven. Thus, the friction brakes are not stressed so much, because they no longer have to work against the compressed air flow.
  • the interruption of the compressed air supply is equal to a complete shutdown of the drive.
  • the erfindungsgenzeße method for braking a motor-driven chainsaw results from the fact that the compressed air supply is reversed. By this measure it is achieved that a friction brake is significantly supported by the braking power of the drive or even makes a friction brake unnecessary.
  • FIG. 1 shows a schematic diagram of a pneumatic chain saw 10 with a chain brake device 12 in section.
  • the pneumatic chain saw 10 has a housing 14. On the housing 14, a first handle and operating area 16 and a second 18 are provided. On the housing 14, a sword is mounted on an end face 20. The sword is not shown in the present figures. A saw chain, also not shown, runs around the sword in a known manner. For this purpose, suitable guide grooves are provided.
  • the chain drive 22 consists of a compressed air from a motor 24 (see Fig. 2 ), which is coupled with a likewise not shown Kettenantriebsrad.
  • the pneumatic motor 24 often consists of a vane motor.
  • the vane motor has a substantially cylindrical housing in which the rotor is rotatably mounted with a shaft. Slats are provided on the rotor.
  • the cylindrical housing has at least one inlet and one outlet opening.
  • On the shaft of the rotor is a gear, which drives the Kettenantriebsrad. If necessary, can be dispensed with a transmission. Then the Kettenantriebsrad is located directly on the shaft of the rotor.
  • the compressed air is generated by means of a compressor and passed through a compressed air hose to the chainsaw 10.
  • the inlet opening of the compressed air motor 24 is provided with a suitable nozzle 25 to which the compressed air hose can be connected. Due to the compressed air flow, the rotor is set in motion to drive.
  • a brake drum 28 is also connected to the drive.
  • the brake drum 28 is part of the chain brake device 12.
  • the brake drum 28 rotates according to the rotor of the chain drive 22.
  • a brake band 30 is looped.
  • Brake drum 28 and brake band 30 form a friction brake 31, which tries to decelerate the chain drive 22 by friction.
  • a mechanical release mechanism 32 is disposed on the chain saw 10.
  • the triggering mechanism 32 has a lever chain 34 and a brake lever 36, which is designed as a hand guard 38.
  • the lever chain 34 has a transmission member 39 and a brake band lever 41.
  • the brake lever 36 is biased by the lever chain 34 with a tension spring 45.
  • the tension spring 45 is attached to the brake band lever 41.
  • the brake band lever 41 can be pivoted about an axis of rotation 43. In a first position of the brake lever 36, the brake band 30 is loose, so that the Kettenantriebsrad and the brake drum 30 can rotate freely.
  • the brake band In a second and braking position of the brake lever 36, the brake band is contracted.
  • the brake drum 28 is braked by friction with the brake band 30.
  • the chain brake device 12 By releasing the trigger mechanism 32, the chain brake device 12 is transferred from the free running first position to a braking second position. This release of the braking operation is performed manually by operating the brake lever 36.
  • Fig. 3 the two adjustment positions of the friction brake are shown schematically.
  • the brake lever 36 When the brake lever 36 is pushed forward, the brake band 30 is contracted and the brake drum 28 is braked by friction.
  • the brake lever 36 When the brake lever 36 is pulled back, the brake band 30 is released.
  • the Brake drum 28 and thus coupled to the brake drum 28 chain drive 22 can run free.
  • the brake lever 36 is connected to a first compressed air valve 42.
  • the compressed air valve 42 is a control means 44, which in the present Aus spaihrungsbeispiel two states knows: "open” - for ongoing operation and "locked” during the braking process.
  • the first compressed air valve 42 shuts off the supply of compressed air as soon as the brake lever 36 is actuated from the first to the second braking position.
  • An adjusting lever 46 is connected to the compressed air valve 42 for manual release with the brake lever 36.
  • the brake lever 36 and the adjusting lever 46 form a triggering device 48.
  • the friction brake 31 not against the chain drive 22, which is otherwise driven by the compressed air flow.
  • the braking behavior is significantly reduced by the blocking of the first compressed air valve 42.
  • a second compressed air valve 50 is provided in addition to the first compressed air valve 42.
  • This second compressed air valve 50 is used in normal operation for starting and stopping the chain drive 22.
  • This compressed air valve 50 is not connected to the friction brake.
  • control means 44 are also designed so that they cause a temporary reversal of direction instead of the complete shut-off of the compressed air flow.
  • the braking process is additionally supported by the compressed air flow.

Landscapes

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

Claims (9)

  1. Dispositif de freinage de chaîne (12) pour tronçonneuse à moteur (10), comprenant
    (a) une chaîne coupante guidée de manière à se déplacer dans un guide-chaîne de la tronçonneuse,
    (b) un dispositif d'entraînement de chaîne pneumatique (22) permettant d'entraîner la chaîne coupante,
    (c) un tambour de frein (28) relié au dispositif d'entraînement de la chaîne (22) et
    (d) des moyens de freinage (30, 34, 36, 38) pouvant être déclenchés et prévus pour freiner le tambour de frein (28) par frottement,
    (e) des moyens de commande pneumatique (44) destinés à commander le courant pneumatique de la tronçonneuse (10) pneumatique, assistant le freinage de la tronçonneuse (10) par l'intermédiaire du dispositif d'entraînement de chaîne pneumatique (23),
    (f) un dispositif de déclenchement (48) destiné à actionner les moyens de commande pneumatique (44),
    (g) le dispositif de déclenchement (48) étant couplé à un mécanisme de déclenchement (32) destiné à déclencher les moyens de freinage (30, 34, 36, 38),
    caractérisé en ce que
    (h) les moyens de commande pneumatique (44) provoquent une inversion du sens du courant pneumatique et
    (i) le mécanisme de déclenchement (32) comprend un levier de freinage mécanique (36), le levier de freinage (36) étant prévu sous forme de bouclier (38).
  2. Dispositif de freinage de chaîne (12) pour tronçonneuse à moteur (10) selon la revendication 1, caractérisé en ce que les moyens de commande pneumatique (44) sont configurés sous forme de soupape de coupure (42).
  3. Dispositif de freinage de chaîne (12) pour tronçonneuse à moteur (10) selon l'une quelconque des revendications 1 à 2, caractérisé en ce que les moyens de freinage (30, 34, 36, 45) sont tarés.
  4. Dispositif de freinage de chaîne (12) pour tronçonneuse à moteur (10) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les moyens de freinage (30, 34, 36, 38) comprennent un ruban de frein (30) entourant le tambour de frein (28).
  5. Tronçonneuse à moteur (10), comprenant
    (a) une chaîne coupante guidée de manière à se déplacer dans un guide-chaîne de la tronçonneuse,
    (b) un dispositif d'entraînement de chaîne pneumatique (22) permettant d'entraîner la chaîne coupante,
    (c) un tambour de frein (28) relié au dispositif d'entraînement de la chaîne (22) et
    (d) des moyens de freinage (30, 34, 36, 38) pouvant être déclenchés et prévus pour freiner le tambour de frein (28) par frottement,
    (e) des moyens de commande pneumatique (44) destinés à commander le courant pneumatique de la tronçonneuse (10) pneumatique, assistant le freinage de la tronçonneuse (10) par l'intermédiaire du dispositif d'entraînement de chaîne pneumatique (22),
    caractérisée en ce que
    (f) les moyens de commande pneumatique (44) provoquent une inversion du sens du courant pneumatique.
  6. Tronçonneuse à moteur (10) selon la revendication 5, caractérisée en ce que les moyens de commande pneumatique (44) sont configurés sous forme de soupape de coupure (42).
  7. Procédé de freinage de tronçonneuse à moteur (10) munie d'un dispositif d'entraînement de chaîne pneumatique (22) entraînant la chaîne coupante, caractérisé en ce que l'amenée d'air comprimé destiné au freinage est commandée en étant inversée.
  8. Procédé de freinage de tronçonneuse à moteur (10) munie d'un dispositif d'entraînement de chaîne pneumatique (22) entraînant la chaîne coupante, selon la revendication 7, caractérisé en ce que l'amenée d'air comprimé est interrompue.
  9. Procédé de freinage de tronçonneuse à moteur (10) munie d'un dispositif d'entraînement de chaîne pneumatique (22) entraînant la chaîne coupante, selon la revendication 7, caractérisé en ce que l'amenée d'air comprimé destiné au freinage est limitée dans le temps.
EP10189385A 2010-10-29 2010-10-29 Dispositif de frein de chaîne pour une scie à chaîne entraînée par air comprimé Active EP2447022B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL10189385T PL2447022T3 (pl) 2010-10-29 2010-10-29 Łańcuchowy zespół hamulcowy pneumatycznej piły łańcuchowej
EP10189385A EP2447022B1 (fr) 2010-10-29 2010-10-29 Dispositif de frein de chaîne pour une scie à chaîne entraînée par air comprimé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10189385A EP2447022B1 (fr) 2010-10-29 2010-10-29 Dispositif de frein de chaîne pour une scie à chaîne entraînée par air comprimé

Publications (2)

Publication Number Publication Date
EP2447022A1 EP2447022A1 (fr) 2012-05-02
EP2447022B1 true EP2447022B1 (fr) 2013-03-13

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EP10189385A Active EP2447022B1 (fr) 2010-10-29 2010-10-29 Dispositif de frein de chaîne pour une scie à chaîne entraînée par air comprimé

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EP (1) EP2447022B1 (fr)
PL (1) PL2447022T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105210690B (zh) * 2015-08-12 2018-07-20 宁波大叶园林设备股份有限公司 一种有对数螺线凸轮机控有刷电机刹停的锂电链锯

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400633A (en) * 1966-08-16 1968-09-10 Chicago Pneumatic Tool Co Ultra-torque nut runner with motor brake
US4267914A (en) * 1979-04-26 1981-05-19 Black & Decker Inc. Anti-kickback power tool control
JPS5631385A (en) * 1979-08-22 1981-03-30 Hitachi Denshi Ltd Brake of dynamic pneumatic bearing type motor
DE3232775A1 (de) 1982-09-03 1984-03-08 Sachs-Dolmar GmbH, 2000 Hamburg Bremsvorrichtung zum abbremsen der saegekette einer tragbaren motorkettensaege
SE459240B (sv) 1982-05-10 1989-06-19 Mcculloch Corp Bromssystem foer kedjesaagar
SE436713B (sv) * 1983-05-20 1985-01-21 Electrolux Ab Givare for utlosning av automatiska skyddsstoppanordningar vid handmanovrerade, motordrivna verktyg
DE3419152A1 (de) 1984-05-23 1985-11-28 Fa. Andreas Stihl, 7050 Waiblingen Kettenbremsvorrichtung
JPS6032601A (ja) 1983-08-01 1985-02-19 株式会社共立 チエンソ−安全制動装置
DE9000157U1 (de) * 1990-01-09 1990-09-27 Breidenbach, Bernd, 35708 Haiger Schutzeinrichtung gegen Verletzungen durch laufende Kettensägen
US20040181951A1 (en) * 2003-03-17 2004-09-23 Wittke Edward R. Chain saw safety system

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Publication number Publication date
PL2447022T3 (pl) 2013-08-30
EP2447022A1 (fr) 2012-05-02

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