EP1288378A1 - Safety device for a front loader - Google Patents

Safety device for a front loader Download PDF

Info

Publication number
EP1288378A1
EP1288378A1 EP02017840A EP02017840A EP1288378A1 EP 1288378 A1 EP1288378 A1 EP 1288378A1 EP 02017840 A EP02017840 A EP 02017840A EP 02017840 A EP02017840 A EP 02017840A EP 1288378 A1 EP1288378 A1 EP 1288378A1
Authority
EP
European Patent Office
Prior art keywords
barrier
safety device
attachment
front loader
tool
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.)
Ceased
Application number
EP02017840A
Other languages
German (de)
English (en)
French (fr)
Inventor
Christer Byström
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.)
ALOE AB
Original Assignee
Alo-Maskiner AB
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 Alo-Maskiner AB filed Critical Alo-Maskiner AB
Publication of EP1288378A1 publication Critical patent/EP1288378A1/en
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3631—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with a hook and a transversal locking element

Definitions

  • the present invention relates to a safety device for a front loader and in particular to a safety device for a front loader of the type having an adjustable locking device for locking work tools to the front loader.
  • a variety of front loaders are currently available equipped with specially adapted attachment devices to assist a machine operator with the attachment of a tool onto the front loader.
  • a proportion of the tools for use with front loaders of this type are provided with two pairs of attachment members, one pair of attachment members located adjacent an upper end of the tool and the second pair of attachment members located adjacent the base of the tool.
  • the attachment device of the front loader is provided with correspondingly located components for mating with the attachment members of the tool.
  • the upper attachment members of the tool are provided by open hook members and the attachment device mounted on the arms of the front loader provide support bars which extend substantially perpendicular to the arms of the front loader. The support bars are formed for engagement with the hooks providing a simple and efficient method of attaching tools to the front loader.
  • a machine operator In order to attach a tool to the front loader, a machine operator must first position the support bars to engage with the hook members. The machine operator may then raise the arms of the front loader or actuate the arms of the front loader to rotate the attachment device so that the tool pivots about the support bars. The lower attachment members of the tool move towards the corresponding attachment components located on the attachment device of the front loader. The base of the tool abuts against a portion of the front loader attachment device to align the attachment members of the tool and the attachment components of the front loader attachment device. The adjustable locking device is then actuated when the attachment members and components are aligned and a locking element extends between the mating members of the tool and the front loader locking the tool securely in position ready for use.
  • attachment members provided on tools and front loaders and there are also many alternative types of actuation devices to operate the adjustable locking device, but the basic principles of the operation remain the same.
  • the adjustable locking device associated with these apparatuses has reduced the amount of manual work required in order to attach a tool to a machine and has therefore improved the overall efficiency of these machines.
  • problems associated with these adjustable locking devices which can cause accidents resulting in serious injuries to people working in the vicinity of these machines.
  • the main problem associated with these adjustable locking devices arises when the locking device has already adopted a locked position before the operator attempts to attach a tool and the machine operator is unaware of this. In this situation, the machine operator engages the hook members of the tool with the support bars in the normal manner and then raises the front loader. The tool pivots about the support bars under the force of its own weight.
  • the present invention provides a safety device for use with front loaders of the type having adjustable locking means for securing work tools in position, wherein the safety device is mountable on an attachment means of the front loader which has adjustable locking means, the safety device comprising a barrier and a biasing means wherein the barrier has a redundant position and an in use position and the barrier is normally biased into the in use position by the biasing means, the barrier preventing the adjustable locking means from adopting the locked position when it is in an in use position, the biasing force of the biasing means being overcome by a tool attachment means during attachment thereby moving the barrier from the in use position to the redundant position allowing the locking means to adopt the locked position.
  • the safety device of the present invention prevents accidental locking of the locking device unless a tool is properly connected to the front loader. If the locking device is actuated inadvertently by the machine operator or in some other way, the active component of the locking device will abut against the barrier of the safety device. If the machine operator subsequently attempts to attach a tool to the front loader the operation will be successful. The active component of the locking device will still close on the tool attachment members following alignment with the attachment components of the front loader as the barrier is moved from the in use position to the redundant position. This will greatly reduce the risk of injuries to other people as a result of tools separating from front loaders during transport of the vehicle or during work activities involving the incorrectly attached tool.
  • the biasing means is provided by a torsion spring.
  • the torsion spring provides a simple and inexpensive biasing member.
  • the biasing means is provided by a cylinder.
  • the cylinder may be mechanical, electrical, pneumatic or hydraulic.
  • the cylinder is actuated by a compression spring.
  • the barrier extends across the path of travel of an active component of the locking means when the barrier is in an in use position.
  • the barrier is pivotally mounted on the attachment member of the front loader.
  • the barrier is mounted on the free end of a piston rod housed in the cylinder.
  • an attachment device for a front loader indicated generally by the reference numeral 1.
  • the device 1 is mounted on the arms of the front loader (not shown) at pivotal mounting points 2 and 3 which allow the operator of the machine to manipulate a mounted tool (see Figure 2) remotely.
  • the attachment device 1 has a support bar 4 located adjacent the upper section of the attachment device 1 said bar 4 extending substantially perpendicular to the direction of travel of the machine.
  • the attachment device 1 also provides a locating bar 5 extending substantially parallel to the support bar 4 and the locating bar 5 is located at the opposite end of the attachment device 1 to which the support bar 4 is located.
  • a frame 6 is located on the support bar 4 having a retainer 7.
  • a handle (not shown) extending from and operating the adjustable locking device is held in an open position by the retainer 7 of the frame 6.
  • a barrier 8 provided by a block of steel material is mounted on the attachment device 1 by a pivot pin 9 and a torsion spring 10 is mounted for engagement with the barrier 8.
  • the barrier 8 extends across the path of travel of the locking element of the adjustable locking device.
  • the locking element is located to extend through lower attachment elements 11 of the attachment device 1 when it is activated.
  • FIG. 1 a side view of an attachment device for a front loader indicated generally by the reference numeral 1 which is identical to the attachment device 1 of Figure 1 described in detail above. Therefore the detailed description of Figure 1 relating to the attachment device 1 is applicable to the attachment device 1 of Figure 2 and identical parts have been designated identical reference numerals.
  • a tool 21 having upper attachment members 22 and lower attachment members 23 is shown properly mounted on the attachment device 1.
  • the upper attachment members 22 are mounted on the support bar 4 and the lower attachment members 23 are aligned with the lower attachment elements 11 of the attachment device 1. Alignment is facilitated by a contact surface 24 of the tool 21 abutting with the locating bar 5.
  • the barrier 8 has been rotated from the in use position as shown in Figure 1 to the redundant position as shown in Figure 2 by contact with the lower attachment members 23 of the tool 21. It will of course be appreciated that the face of the barrier 8 which prevents a released active element of the locking device from extending through the attachment elements 11 must be closer to the active element of the locking device than or at least aligned with the expected path of travel of the face of the attachment member 23 of the tool 21 which would engage with the released active element of the locking device.
  • a machine operator locates the support bar 4 of the attachment device 1 to engage with the upper attachment members 22 of the tool 21.
  • the operator raises the attachment device 1 and the tool 21 pivots about the support bar 4.
  • the machine operator may pivot the attachment device 1 relative to the tool 21 by adjusting the position of the pivotal mounting points 2 and 3 relative to one another.
  • the consequence of either action is that the lower attachment members 23 of the tool 21 and the lower attachment components 11 of the attachment device 1 align with one another.
  • the locating bar 5 is provided on the attachment device 1 for contacting the surface 24 of the tool 21 in order to align the attachment members 23 and the attachment components 11.
  • the handle extending from and actuating the locking device is positioned to engage a section of the front loader at the same time as the attachment components 11 and attachment components 23 align.
  • the handle is released from the retainer 7 and the locking member of the locking device is activated securely locking the tool 21 to the attachment device 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Shovels (AREA)
  • Operation Control Of Excavators (AREA)
EP02017840A 2001-08-31 2002-08-08 Safety device for a front loader Ceased EP1288378A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0102915 2001-08-31
SE0102915A SE519997C2 (sv) 2001-08-31 2001-08-31 Säkerhetsanordning vid arbetsredskap för fronlastare

Publications (1)

Publication Number Publication Date
EP1288378A1 true EP1288378A1 (en) 2003-03-05

Family

ID=20285205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017840A Ceased EP1288378A1 (en) 2001-08-31 2002-08-08 Safety device for a front loader

Country Status (2)

Country Link
EP (1) EP1288378A1 (sv)
SE (1) SE519997C2 (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3502358A1 (en) * 2017-12-22 2019-06-26 Kubota Corporation Front loader and working machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0402366L (sv) * 2004-09-29 2006-03-14 Aaloe Ab Anordning och förfarande för att fästa ett redskap till en lastare

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2307752A1 (fr) * 1975-04-14 1976-11-12 Int Harvester Co Systeme d'attache rapide de bennes et autres outils sur les fleches de chargeuses et engins analogues
US4187050A (en) * 1978-02-15 1980-02-05 Caterpillar Tractor Co. Quick-disconnect mechanical coupling
EP0578447A1 (en) * 1992-07-04 1994-01-12 Fermec Manufacturing Limited Implement attachment coupler
FR2703113A1 (fr) * 1993-03-24 1994-09-30 Soermatp Dispositif d'attache rapide de godet ou analogue sur le bras de manÓoeuvre d'une machine de travaux publics ou agricoles par exemple.
FR2785952A1 (fr) * 1998-11-12 2000-05-19 Alain Husson Attache rapide pour fixer un outil a l'extremite du bras d'un chargeur ou analogue

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2307752A1 (fr) * 1975-04-14 1976-11-12 Int Harvester Co Systeme d'attache rapide de bennes et autres outils sur les fleches de chargeuses et engins analogues
US4187050A (en) * 1978-02-15 1980-02-05 Caterpillar Tractor Co. Quick-disconnect mechanical coupling
EP0578447A1 (en) * 1992-07-04 1994-01-12 Fermec Manufacturing Limited Implement attachment coupler
FR2703113A1 (fr) * 1993-03-24 1994-09-30 Soermatp Dispositif d'attache rapide de godet ou analogue sur le bras de manÓoeuvre d'une machine de travaux publics ou agricoles par exemple.
FR2785952A1 (fr) * 1998-11-12 2000-05-19 Alain Husson Attache rapide pour fixer un outil a l'extremite du bras d'un chargeur ou analogue

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3502358A1 (en) * 2017-12-22 2019-06-26 Kubota Corporation Front loader and working machine
US10724205B2 (en) 2017-12-22 2020-07-28 Kubota Corporation Front loader and working machine

Also Published As

Publication number Publication date
SE0102915D0 (sv) 2001-08-31
SE519997C2 (sv) 2003-05-06
SE0102915L (sv) 2003-03-01

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