EP3944938A1 - Sicherheitsvorrichtung für handschneidmaschinen - Google Patents

Sicherheitsvorrichtung für handschneidmaschinen Download PDF

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Publication number
EP3944938A1
EP3944938A1 EP20382687.0A EP20382687A EP3944938A1 EP 3944938 A1 EP3944938 A1 EP 3944938A1 EP 20382687 A EP20382687 A EP 20382687A EP 3944938 A1 EP3944938 A1 EP 3944938A1
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EP
European Patent Office
Prior art keywords
throttle trigger
locking device
safety
safety mechanism
cutting element
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.)
Pending
Application number
EP20382687.0A
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English (en)
French (fr)
Inventor
Pedro Luis Velázquez Montiel
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
Priority to EP20382687.0A priority Critical patent/EP3944938A1/de
Publication of EP3944938A1 publication Critical patent/EP3944938A1/de
Pending legal-status Critical Current

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    • 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
    • B27G19/003—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for chain saws
    • 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
    • B27B17/0008—Means for carrying the chain saw, e.g. handles
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/02—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by hand, foot, or like operator controlled initiation means

Definitions

  • the present invention relates to a safety mechanism for manual cutting machines, such as chainsaws or mechanical saws, circular saws, jigsaws, grinders, motor grinders, etc., especially designed to act in the event of an accident from an involuntary reaction of the user.
  • manual cutting machines such as chainsaws or mechanical saws, circular saws, jigsaws, grinders, motor grinders, etc.
  • Manual cutting machines of the indicated type usually consist of a cutting element (toothed chain, disc, saw blade, etc.) actuated by a motor that makes it move (turn, rotate, advance, retreat, etc.) at a high speed.
  • Said motors are usually petrol or electric motors, in the latter case being able to be powered by means of cables or batteries.
  • a throttle trigger connected to the motor enables the user or operator to accelerate or decelerate the motion of the cutting element in order to increase or decrease the speed thereof respectively.
  • a chainsaw having a safety mechanism which comprises a centrifugal clutch, a brake drum and a strap arranged around said brake drum.
  • the centrifugal clutch is configured to intermesh with and rotate the brake drum in order to enable the advancement of the cutting chain.
  • the strap is configured to contract on the brake drum, in order to immobilise it, instantaneously locking the motion of the chain.
  • the activation of said safety mechanism occurs in two different ways. The first one by means of a safety lever which, actuated by the user themself in a risky situation, enables the strap to be contracted on the brake drum. The second one occurs when the user releases the throttle trigger.
  • the present invention solves the aforementioned problem, thanks to a safety mechanism for manual cutting machines, specially designed to lock the cutting element when a user unconsciously reacts to a risky situation by pressing the throttle trigger to the maximum.
  • Said safety mechanism results in an additional and/or complementary safety measure to those usually present in current cutting machines.
  • the safety mechanism of the present invention is especially applicable in manual cutting machines, such as chainsaws or mechanical saws, circular saws, jigsaws, grinders, motor grinders, etc., either as a serial mechanism integrated in newly manufactured machines, or for it to be assembled in existing machines.
  • These cutting machines are of the type that comprise at least one cutting element and a motor configured to move said cutting element.
  • Said cutting element can be a toothed chain, a saw blade, a grinding disc, a hacksaw blade, etc. the motion of which can be movement that is rotary or rotational, translational forwards or backwards, etc., depending on the case.
  • the motor may be a petrol or diesel combustion motor, an electric motor powered by means of cable and/or battery, etc.
  • These types of cutting machines usually have a portable nature, usually having a handle for the handling and transport thereof by the user.
  • the safety mechanism comprises:
  • the throttle trigger has a double path, wherein the first path performs the function of accelerating the motor, while the second path enables the locking device to be actuated in order to instantaneously brake the chain when the throttle trigger is pulled to the maximum by an involuntary reaction of the user as a consequence of a risky and/or accidental situation.
  • a connection occurs between the position of the throttle trigger and the motor, from a rest position with the throttle trigger released, in other words, without receiving any pressure from the user, to a safety position wherein the motion of the cutting element is at the maximum, said motion accelerating from the rest position to the safety position as the pressure exerted by the user on the throttle trigger increases.
  • a connection occurs between the position of the throttle trigger and the locking device wherein, once the safety position has been exceeded, the activation of the locking device occurs to instantaneously stop the motion of the cutting element when the user continues to pull the throttle trigger once the safety position has been reached.
  • the first path and the second path occur sequentially as the pressure exerted by the user on the throttle trigger increases, wherein the first path starts from a rest position with the throttle trigger released, while the second path ends in a final position with the throttle trigger pulled to the maximum or fully pulled.
  • the throttle trigger is configured to activate the locking device during the second path by means of electrical, mechanical, electromechanical or hydraulic means, and/or possible combinations thereof.
  • the deactivation of the locking device can be carried out by means of various electrical, mechanical, electromechanical or hydraulic means, and/or possible combinations thereof, starting from a manual action exerted by the user himself once the situation of risk and/or danger has been controlled.
  • the locking device comprises a deactivation element configured to unlock the cutting element when manually actuated by the user once said locking device has been activated.
  • Said deactivation element may adopt the form of a lever, handle, button, push button, etc.
  • it can be an element and/or component incorporated in the very locking device of the machine, and/or a complementary and/or additional element thereto.
  • the locking device may adopt various embodiments to the extent that they enable the cutting element to be instantaneously locked after the activation of said locking device.
  • the locking device comprises:
  • the locking device comprises:
  • the lever of the very locking device acts directly as a deactivation element of the safety mechanism of the present invention, regardless of whether other complementary and/or additional deactivation elements are incorporated.
  • this comprises an actuating rod having:
  • said actuating rod is configured to activate the locking device when the throttle trigger pushes the first end once the safety position has been exceeded.
  • the second end is joined to a free end of the strap, while said actuating rod is configured to contract the strap on the brake drum when pushed by the throttle trigger during the second path.
  • the actuating rod comprises a helical spring on the first end.
  • the function of said helical spring is mainly to keep the actuating rod in the rest state thereof when the locking device is deactivated, in other words, in the suitable place to be able to be pushed by the throttle trigger. In the event of an accident, and as an involuntary response from the operator, the latter exerts sufficient force to overcome the spring and actuate the locking device.
  • the throttle trigger comprises an actuating pin configured to push the first end of the actuating rod during the second path.
  • Said actuating pin makes it possible to overcome the force of the helical spring and move the actuating rod linearly, making the strap contract in order to stop the clutch and thus causing the cutting element of the machine to brake immediately.
  • this comprises:
  • the electromagnetic actuator is a linear motion electromagnet, which has a shaft or bolt configured to extend linearly when receiving an electrical current.
  • the electromagnetic actuator is configured to contract the strap on the brake drum and immobilise same in order to lock the cutting element. This is carried out by means of the shaft or bolt that, joined to the free end of the strap, enables same to be pulled when it moves linearly when receiving the electrical current.
  • the throttle trigger comprises:
  • the first one is the objective of preventing the operator from having an accident and, the second one, that the cutting unit or element of the cutting machine is locked whenever the operator is not using it.
  • the legs are configured not to press the push buttons during the first path, in order to keep the locking device deactivated between the rest position and the safety position. Therefore, enabling the acceleration of the cutting element during said first path.
  • the safety mechanism comprises:
  • the second spring is configured to keep the throttle trigger in the rest position when it is released, in other words, when it is not being pulled by the user.
  • this comprises:
  • the hydraulic actuators are linear motion hydraulic cylinders, of the type that have a hydraulic piston configured to extend linearly when receiving the pressure of a hydraulic fluid.
  • the first hydraulic actuator is configured to contract the strap on the brake drum and immobilise same in order to lock the cutting chain. This is carried out by means of the hydraulic piston that, joined to the free end of the strap, enables the same to be pulled when it moves linearly when receiving the pressure of a hydraulic fluid.
  • the throttle trigger comprises an actuating pin configured to press the second hydraulic actuator once the safety position has been exceeded, enabling the pressure of the hydraulic fluid to be supplied to the first hydraulic actuator through the hydraulic pipe in order to keep the locking device activated once said safety position has been exceeded.
  • the safety mechanism comprises a helical spring arranged between the hydraulic piston and the throttle trigger.
  • the function of said helical spring is mainly to keep the hydraulic piston in the rest state thereof when the locking device is deactivated, in other words, in the suitable place to be able to be pressed by the actuating pin of the throttle trigger. In the event of an accident, and as an involuntary response from the operator, the latter exerts sufficient force to overcome the spring and actuate the locking device.
  • the safety mechanism of the present invention comprises two switches and/or push buttons of the limit switch type connected to the rest, work and safety positions of the throttle trigger.
  • said limit switches when said limit switches are activated in any of said positions, they act by opening or closing an electrical circuit which, in turn, powers other elements connected to the safety mechanism, the locking mechanism and/or the motor that transmits the motion to the cutting element. This enables the motion of the cutting element until the safety position is reached, or instantaneously locking same by continuing to pull the throttle trigger once the safety position has been exceeded.
  • the safety mechanism of the present invention may be part of a newly manufactured manual cutting machine, as a serial element integrated therein, or it can be assembled in existing machines by performing the necessary adjustments and/or adaptations, both structural (housing, grip, etc.) and functional (throttle trigger, mechanisms, motor, etc.).
  • the present invention also relates to a manual cutting machine, such as a chainsaw or mechanical saw of the type used to cut trees and wood, a circular saw, a jigsaw, a grinder, a motor grinder, etc., comprising the previously described safety mechanism.
  • said manual cutting machine comprises at least one cutting element (toothed chain, disc, saw blade, etc.) actuated by a motor that makes it move (turn, rotate, advance, retreat, etc.) at a high speed.
  • said motor may be a petrol or electric motor, in the latter case being able to be powered by means of cables and/or one or more batteries.
  • said cutting machine further has a throttle trigger connected to the motor which enables the user or operator to accelerate or decelerate the motion of the cutting element in order to increase or reduce the speed thereof respectively.
  • FIGS 1, 2 and 3 show various schematic views of the safety mechanism (1) of the present invention in a manual cutting machine, in this case a chainsaw, according to a first embodiment of mechanical operation of said safety mechanism (1).
  • said chainsaw comprises a cutting element (2) of the toothed chain type, and a motor (3) configured to move said cutting element (2).
  • the safety mechanism (1) comprises:
  • the throttle trigger (4) is connected to an additional safety element in the form of an unlocking push button (44), such that in order to enable the actuation of the very throttle trigger (4), the user has to necessarily keep the unlocking push button (44) pressed at the same time. Said action is performed with the same hand with which the throttle trigger (4) is pulled, for which reason both elements (4, 44) are arranged in the handle within reach of said same hand. If the unlocking push button (44) is released, or if it is not pulled sufficiently, the throttle trigger (4) stays locked, the motion of the cutting element (2) not being able to be accelerated.
  • an unlocking push button (44) is connected to an additional safety element in the form of an unlocking push button (44), such that in order to enable the actuation of the very throttle trigger (4), the user has to necessarily keep the unlocking push button (44) pressed at the same time. Said action is performed with the same hand with which the throttle trigger (4) is pulled, for which reason both elements (4, 44) are arranged in the handle within reach of said same hand
  • the locking device (5) comprises:
  • the locking device (5) comprises:
  • the lever (51) of the very locking device (5) acts directly as a deactivation element (51) of the safety mechanism (1) of the present invention, regardless of whether other complementary and/or additional deactivation elements (51) are incorporated.
  • the throttle trigger (4) has:
  • the throttle trigger (4) has a double path (Ra, Rs), wherein the first path (Ra) performs the function of accelerating the motor (3), while the second path (Rs) enables the locking device (5) to be actuated in order to instantaneously brake the chain when the throttle trigger (4) is pulled to the maximum by an involuntary reaction of the user as a consequence of a risky and/or accidental situation.
  • a connection occurs between the position of the throttle trigger (4) and the motor (3), from a rest position (P 0 ) with the throttle trigger (4) released, in other words, without receiving any pressure from the user, to a safety position (Ps) wherein the motion of the cutting element (2) is at the maximum, said motion accelerating from the rest position (P 0 ) to the safety position (Ps) as the pressure exerted by the user on the throttle trigger (4) increases.
  • a connection occurs between the position of the throttle trigger (4) and the locking device (5) wherein, once the safety position (Ps) has been exceeded, the activation of the locking device (5) occurs to instantaneously stop the motion of the cutting element (2) when the user continues to pull the throttle trigger (4) once the safety position (Ps) has been reached.
  • the first path (Ra) and the second path (Rs) occur sequentially as the pressure exerted by the user on the throttle trigger (4) increases, wherein the first path (Ra) starts from a rest position (Po) with the throttle trigger (4) released, while the second path (Rs) ends in a final position with the throttle trigger (4) pulled to the maximum or fully pulled.
  • this comprises an actuating rod (8) having:
  • Said actuating rod (8) is configured to activate the locking device (5) when the throttle trigger (4) pushes the first end (81) once the safety position (Ps) has been exceeded.
  • the second end (82) is joined to a free end (71) of the strap (7), while said actuating rod (8) is configured to contract the strap (7) on the brake drum (62) when pushed by the throttle trigger (4) during the second path (Rs).
  • the actuating rod (8) comprises a helical spring (83) on the first end (81).
  • the throttle trigger (4) comprises an actuating pin (41) configured to push the first end (81) of the actuating rod (8) during the second path (Rs). Said actuating pin (41) makes it possible to overcome the force of the helical spring (83) and move the actuating rod (8) linearly, making the strap (7) contract in order to stop the clutch (6) and thus causing the cutting element (2) of the machine to brake immediately.
  • the actuating pin (41) may have different configurations, dimensions and/or possible positions in the very throttle trigger (4), depending on the shape/design of the housing and/or the handle of the cutting machine, as well as on the position of the first end (81) of the actuating rod (8), in order to be able to come into contact with said first end (81) in order to push same during the second path (Rs).
  • FIGS 4 and 5 show various schematic views of the safety mechanism (1) of the present invention in a manual cutting machine, in this case a chainsaw, according to a second embodiment of electromagnetic operation of said safety mechanism (1).
  • Said chainsaw comprises a cutting element (2) of the toothed chain type, and a motor (3) configured to move said cutting element (2).
  • the safety mechanism (1) comprises:
  • the throttle trigger (4) is connected to an additional safety element in the form of an unlocking push button (44), such that in order to enable the actuation of the very throttle trigger (4), the user has to necessarily keep the unlocking push button (44) pressed at the same time. Said action is performed with the same hand with which the throttle trigger (4) is pulled, for which reason both elements (4, 44) are arranged in the handle within reach of said same hand. If the unlocking push button (44) is released, or if it is not pulled sufficiently, the throttle trigger (4) stays locked, the motion of the cutting element (2) not being able to be accelerated.
  • an unlocking push button (44) is connected to an additional safety element in the form of an unlocking push button (44), such that in order to enable the actuation of the very throttle trigger (4), the user has to necessarily keep the unlocking push button (44) pressed at the same time. Said action is performed with the same hand with which the throttle trigger (4) is pulled, for which reason both elements (4, 44) are arranged in the handle within reach of said same hand
  • the locking device (5) comprises:
  • the locking device (5) comprises:
  • the lever (51) of the very locking device (5) acts directly as a deactivation element (51) of the safety mechanism (1) of the present invention, regardless of whether other complementary and/or additional deactivation elements (51) are incorporated.
  • the throttle trigger (4) has:
  • the throttle trigger (4) has a double path (Ra, Rs), wherein the first path (Ra) performs the function of accelerating the motor (3), while the second path (Rs) enables the locking device (5) to be actuated in order to instantaneously brake the chain when the throttle trigger (4) is pulled to the maximum by an involuntary reaction of the user as a consequence of a risky and/or accidental situation.
  • a connection occurs between the position of the throttle trigger (4) and the motor (3), from a rest position (P 0 ) with the throttle trigger (4) released, in other words, without receiving any pressure from the user, to a safety position (Ps) wherein the motion of the cutting element (2) is at the maximum, said motion accelerating from the rest position (P 0 ) to the safety position (Ps) as the pressure exerted by the user on the throttle trigger (4) increases.
  • a connection occurs between the position of the throttle trigger (4) and the locking device (5) wherein, once the safety position (Ps) has been exceeded, the activation of the locking device (5) occurs to instantaneously stop the motion of the cutting element (2) when the user continues to pull the throttle trigger (4) once the safety position (Ps) has been reached.
  • the first path (Ra) and the second path (Rs) occur sequentially as the pressure exerted by the user on the throttle trigger (4) increases, wherein the first path (Ra) starts from a rest position (Po) with the throttle trigger (4) released, while the second path (Rs) ends in a final position with the throttle trigger (4) pulled to the maximum or fully pulled.
  • the safety mechanism (1) of the present invention comprises:
  • the electromagnetic actuator (9) is a linear motion electromagnet, which has a shaft or bolt (91) configured to extend linearly when receiving the electrical current (I).
  • the electromagnetic actuator (9) is configured to contract the strap (7) on the brake drum (62) and immobilise same in order to lock the cutting element (2). This is carried out by means of the shaft or bolt (91) that, joined to the free end (71) of the strap (7), enables same to be pulled when it moves linearly when receiving the electrical current (I), Figure 5 .
  • the throttle trigger (4) comprises:
  • the first one is the objective of preventing the operator from having an accident and, the second one, that the cutting unit or element (2) of the cutting machine is locked whenever the operator is not using it.
  • the legs (42, 43) are configured not to press the push buttons (11, 12) during the first path (Ra), in order to keep the locking device (5) deactivated between the rest position (Po) and the safety position (Ps). Therefore, enabling the acceleration of the cutting element (2) during said first path (Ra).
  • the legs (42, 43) may have different possible configurations, dimensions and/or positions in the very throttle trigger (4), depending on the shape/design of the housing and/or the handle of the cutting machine, as well as on the position of the push buttons (11, 12) in order to carry out the actions described.
  • the safety mechanism (1) comprises:
  • the second spring (22) is configured to keep the throttle trigger (4) in the rest position (Po) when it is released, in other words, when it is not being pulled by the user.
  • FIGS 6 , 7 and 8 show various schematic views of the safety mechanism (1) of the present invention in a manual cutting machine, in this case a chainsaw, according to a second embodiment of hydraulic operation of said safety mechanism (1).
  • said chainsaw comprises a cutting element (2) of the toothed chain type, and a motor (3) configured to move said cutting element (2).
  • the safety mechanism (1) comprises:
  • the throttle trigger (4) is connected to an additional safety element in the form of an unlocking push button (44), such that in order to enable the actuation of the very throttle trigger (4), the user has to necessarily keep the unlocking push button (44) pressed at the same time. Said action is performed with the same hand with which the throttle trigger (4) is pulled, for which reason both elements (4, 44) are arranged in the handle within reach of said same hand. If the unlocking push button (44) is released, or if it is not pulled sufficiently, the throttle trigger (4) stays locked, the motion of the cutting element (2) not being able to be accelerated.
  • an unlocking push button (44) is connected to an additional safety element in the form of an unlocking push button (44), such that in order to enable the actuation of the very throttle trigger (4), the user has to necessarily keep the unlocking push button (44) pressed at the same time. Said action is performed with the same hand with which the throttle trigger (4) is pulled, for which reason both elements (4, 44) are arranged in the handle within reach of said same hand
  • the locking device (5) comprises:
  • the locking device (5) comprises:
  • the lever (51) of the very locking device (5) acts directly as a deactivation element (51) of the safety mechanism (1) of the present invention, regardless of whether other complementary and/or additional deactivation elements (51) are incorporated.
  • the throttle trigger (4) has:
  • the throttle trigger (4) has a double path (Ra, Rs), wherein the first path (Ra) performs the function of accelerating the motor (3), while the second path (Rs) enables the locking device (5) to be actuated in order to instantaneously brake the chain when the throttle trigger (4) is pulled to the maximum by an involuntary reaction of the user as a consequence of a risky and/or accidental situation.
  • a connection occurs between the position of the throttle trigger (4) and the motor (3), from a rest position (P 0 ) with the throttle trigger (4) released, in other words, without receiving any pressure from the user, to a safety position (Ps) wherein the motion of the cutting element (2) is at the maximum, said motion accelerating from the rest position (P 0 ) to the safety position (Ps) as the pressure exerted by the user on the throttle trigger (4) increases.
  • a connection occurs between the position of the throttle trigger (4) and the locking device (5) wherein, once the safety position (Ps) has been exceeded, the activation of the locking device (5) occurs to instantaneously stop the motion of the cutting element (2) when the user continues to pull the throttle trigger (4) once the safety position (Ps) has been reached.
  • the first path (Ra) and the second path (Rs) occur sequentially as the pressure exerted by the user on the throttle trigger (4) increases, wherein the first path (Ra) starts from a rest position (Po) with the throttle trigger (4) released, while the second path (Rs) ends in a final position with the throttle trigger (4) pulled to the maximum or fully pulled.
  • the safety mechanism (1) of the present invention comprises:
  • the hydraulic actuators (100, 102) are linear motion hydraulic cylinders, of the type that have a hydraulic piston (104, 105) configured to extend linearly when receiving the pressure of a hydraulic fluid (F).
  • Two fittings (103) enable the hydraulic connection between the hydraulic pipe (101) and the hydraulic actuators (100, 102).
  • the first hydraulic actuator (100) is configured to contract the strap (7) on the brake drum (62) and immobilise same in order to lock the cutting chain (2). This is carried out by means of the hydraulic piston (104) which, joined to the free end (71) of the strap (7), enables said free end (71) to be pulled when it moves linearly when receiving the pressure of a hydraulic fluid (F).
  • the throttle trigger (4) comprises an actuating pin (41) configured to press the hydraulic piston (105) of the second hydraulic actuator (102) once the safety position (Ps) has been exceeded, enabling the pressure of the hydraulic fluid (F) to be supplied to the first hydraulic actuator (100) through the hydraulic pipe (101) in order to keep the locking device (5) activated once said safety position (Ps) has been exceeded.
  • the actuating pin (41) may have different configurations, dimensions and/or possible positions on the throttle trigger (4) itself, depending on the shape/design of the housing and/or the handle of the cutting machine, as well as on the second hydraulic actuator (102), in order to be able to press the hydraulic piston (105) of said second hydraulic actuator (102) during the second path (Rs).
  • the safety mechanism (1) comprises a helical spring (83) arranged between the hydraulic piston (102) and the throttle trigger (4).
  • the throttle trigger (4) performs the double function of acceleration and safety.
  • Newly manufactured cutting machines can be designed to directly have a single throttle trigger (4) configured to perform both functions.
  • the throttle trigger of same can be adapted to perform both functions, without needing to add an additional trigger with a safety function.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Sawing (AREA)
EP20382687.0A 2020-07-29 2020-07-29 Sicherheitsvorrichtung für handschneidmaschinen Pending EP3944938A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20382687.0A EP3944938A1 (de) 2020-07-29 2020-07-29 Sicherheitsvorrichtung für handschneidmaschinen

Applications Claiming Priority (1)

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EP20382687.0A EP3944938A1 (de) 2020-07-29 2020-07-29 Sicherheitsvorrichtung für handschneidmaschinen

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EP3944938A1 true EP3944938A1 (de) 2022-02-02

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043916A1 (en) * 2005-10-07 2007-04-19 Husqvarna Ab Carburettor choke mechanism
US20100218388A1 (en) 2006-11-10 2010-09-02 Kent Myers Chainsaw throttle and brake mechanisms
EP2422611A2 (de) * 2010-08-24 2012-02-29 Makita Corporation Tragbare angetriebene Arbeitsmaschine
US8661951B2 (en) * 2008-02-06 2014-03-04 Andreas Stihl Ag & Co. Kg Hand-guided power tool
EP2746008A1 (de) * 2012-12-22 2014-06-25 Andreas Stihl AG & Co. KG Handgeführtes Arbeitsgerät mit einem Antriebsmotor zum Antrieb mindestens eines Werkzeugs und Verfahren zu dessen Betrieb

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043916A1 (en) * 2005-10-07 2007-04-19 Husqvarna Ab Carburettor choke mechanism
US20100218388A1 (en) 2006-11-10 2010-09-02 Kent Myers Chainsaw throttle and brake mechanisms
US8661951B2 (en) * 2008-02-06 2014-03-04 Andreas Stihl Ag & Co. Kg Hand-guided power tool
EP2422611A2 (de) * 2010-08-24 2012-02-29 Makita Corporation Tragbare angetriebene Arbeitsmaschine
EP2746008A1 (de) * 2012-12-22 2014-06-25 Andreas Stihl AG & Co. KG Handgeführtes Arbeitsgerät mit einem Antriebsmotor zum Antrieb mindestens eines Werkzeugs und Verfahren zu dessen Betrieb

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