EP1963585A1 - Dispositif de sécurité pour ensemble d'attelage hydraulique - Google Patents

Dispositif de sécurité pour ensemble d'attelage hydraulique

Info

Publication number
EP1963585A1
EP1963585A1 EP06840375A EP06840375A EP1963585A1 EP 1963585 A1 EP1963585 A1 EP 1963585A1 EP 06840375 A EP06840375 A EP 06840375A EP 06840375 A EP06840375 A EP 06840375A EP 1963585 A1 EP1963585 A1 EP 1963585A1
Authority
EP
European Patent Office
Prior art keywords
safety device
hydraulic
hitch assembly
disengaged position
body portion
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.)
Withdrawn
Application number
EP06840375A
Other languages
German (de)
English (en)
Inventor
Stuart Alexander Essex
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.)
Positti Nicole Elizabeth
Original Assignee
Positti Nicole Elizabeth
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
Priority claimed from AU2005906979A external-priority patent/AU2005906979A0/en
Application filed by Positti Nicole Elizabeth filed Critical Positti Nicole Elizabeth
Publication of EP1963585A1 publication Critical patent/EP1963585A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E02F3/3618—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with two separating hooks
    • 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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • 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
    • 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
    • E02F3/365—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with redundant latching means, e.g. for safety purposes
    • 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
    • E02F3/3663—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat hydraulically-operated

Definitions

  • the present invention relates to a safety device for a hydraulic hitch assembly and in particular to a safety device that may be operated remotely from the hitch assembly.
  • hydraulic hitch assemblies are required to be fitted with a safety restraining device that would prevent the hitch assembly from disengaging from the attachment.
  • These safety restraining devices are typically mechanical arrangements that require the operator of the machinery to engage and disengage the safety device at the site of the hitch assembly. As such, this means that each time the attachment is changed, the operator must descend from the cabin operating the machine to disengage the safety device. Thereafter, the operator is required to remount the cabin to operate the hydraulics driving the hitch assembly to replace the attachment of the hitch assembly, after which he must then once again descend from the cabin to re-engage the safety restraining device. Accordingly, the present invention seeks to provide a safety device for use in hydraulic hitch assemblies and in particular seeks to provide a safety device that may be operated from the operating cabin of the machinery including the hitch assembly.
  • the present invention provides a safety device for a hydraulic hitch assembly operable between an engaged and a disengaged position, the safety device including: a main body portion moveable between an engaged position and a disengaged position, whereby when the main body portion is in the engaged position the safety device prevents the hydraulic hitch assembly from moving to a disengaged position; a biasing means to bias the main body portion towards an engaged position; and, a hydraulic piston which when operated acts against the biasing means and moves the main body portion to a disengaged position.
  • the main body portion moves between an engaged position and a disengaged position about a pivot point.
  • the biasing means is provided by a mechanical arrangement such as for example a spring.
  • the hydraulic hitch assembly may be operable between a disengaged position and an engaged position by means of a hydraulic ram or piston.
  • the hydraulic ram or piston is operated by a hydraulic circuit, wherein to move the hitch assembly into the engaged position hydraulic fluid is pumped under pressure into one side of the ram or piston to effect the movement.
  • a valve assembly included in the hydraulic circuit.
  • this valve assembly is in the form of a check valve. The valve assembly prevents movement of the ram or piston until a positive hydraulic pressure is applied to the valve assembly whereby the hydraulic ram or piston is released allowing the hitch assembly to return to the disengaged position.
  • the hydraulic piston of the safety device is also connected to the hydraulic circuit of the hitch assembly. More preferably, the positive pressure, applied to the valve assembly to release the hydraulic piston and/or ram to allow the hitch assembly to return to the disengaged position, is initially applied to the hydraulic piston of the safety device thereby moving the main body portion of the safety device to the disengaged position prior to the hitch assembly returning to a disengaged position.
  • the present invention provides a method of disengaging a hydraulic hitch assembly from an engaged position, the hydraulic hitch assembly including a safety device and wherein the method includes the following steps:
  • FIG. 1 is a schematic view of a safety device in accordance with one aspect of the present invention.
  • Figure 2 is a schematic view of a hydraulic hitch assembly
  • Figure 3 is a schematic view of a hydraulic hitch assembly fitted with the safety device in the engaged position in accordance with one aspect of the present invention
  • Figure 4 is a schematic view of a hydraulic hitch assembly fitted with the safety device in the disengaged position in accordance with one aspect of the present invention.
  • hydraulic hitch assembly as used throughout the specification is intended to include quick couplers as well as any type of hydraulic assembly for attaching and detaching various attachments to large machinery.
  • the safety device 10 which may be attached to a hydraulic hitch assembly.
  • the safety device 10 includes a main body portion 12 which is substantially elongate and includes an engagement tip 85 and pivoting point 15.
  • the safety device 10 also includes a spring 20 which in the instant diagram is biased against retaining block 45 which is fixed relative to the main body portion of a hydraulic hitch assembly
  • the safety device 10 also includes a hydraulic piston 35 with hydraulic fluid space 25 to receive hydraulic fluid under pressure in order to operate the hydraulic piston 35.
  • the hydraulic piston is shown resting against retaining block 40 which would also be attached and fixed relative to the main body portion of the hitch assembly and not attached to the main body portion 12 of safety device 10.
  • the retaining block may be attached to the body portion of the hydraulic ram 70 associated with the hydraulic hitch assembly.
  • FIG. 2 there is shown generally a hydraulic hitch assembly indicated by 51 used for attaching an attachment such as a bucket or rock hammer to heavy machinery such as for example an excavator.
  • the hitch assembly 51 includes two remotely operable oppositely directed jaws 60, 65 which are able to move between an engaged position (as depicted in Figure 2) and a disengaged position. In the disengaged position, the opposing jaws 60 and 65 are able to fit between the transverse hinge pins 50 and 55 of a particular attachment thereby releasing the attachment.
  • the jaws 60 and 65 are pushed apart by means of a hydraulic ram 70 operable from the cabin of the machinery, which pushes apart jaws 60 and 65 until the attachment is securely fastened to the hitch assembly 51.
  • the hydraulic ram 70 is operated via a hydraulic circuit through which operation pumps hydraulic fluid into the hydraulic ram 70 which in turn pushes jaw 65 away from 60 to engage with the attachment, at which point the hydraulic fluid is shut off from a main hydraulic circuit by means of check valve, thereby maintaining jaws 65 and 60 in an engaged state.
  • a positive pressure must be applied to the check valve in order to release the hydraulic ram 70 thus allowing jaw 65 to return to the disengaged state.
  • FIG. 3 there is shown a safety device 10 fitted in conjunction with a hydraulic hitch assembly.
  • the safety device 10 as well as the hydraulic hitch assembly are shown in the engaged position, whereby an attachment is securely fastened to the hitch assembly.
  • the hydraulic ram 70 would release thereby allowing jaw 65 to contract towards jaw 60.
  • the engagement point 85 of the safety device would engage with engagement crevasse 80 of the hitch assembly 51 thereby preventing jaws 60 and 65 from moving together beyond a distance that would allow the attachment to disengage from the hitch assembly.
  • the safety device 10 is hinged at a fixed point 15 relative to the hitch assembly 51 where it may rotate about point 15 between an engaged and disengaged position. Whilst the hydraulic hitch assembly 51 is in the engaged position, the spring 20 of the safety device 10 is biasing the safety device into the engaged position by pushing against retaining block 45 attached and fixed relative to the hitch assembly 51.
  • FIG 4 there is shown the safety device 10 in the disengaged position whereby the hydraulic piston 35 of the safety device 10 has pushed against retaining block 40 attached to the hitch assembly thereby moving the safety device 10 to the disengaged position.
  • the engagement point 85 of the safety device 10 is no longer aligned with the corresponding engagement crevasse 80 of the hitch assembly thereby allowing jaws 60 and 65 to retract once the hydraulic ram of the hitch assembly is allowed to release and move the hydraulic hitch assembly 51 into the disengaged position.
  • a clear advantage of the safety device 10, is that in order to release the device and allow the jaws 60 and 65 of the hitch assembly 51 to retract to the disengaged position, the hydraulic piston 35 of the safety device 10 may be operated from a point that is remote from the hitch assembly such as for example from the cabin of the heavy machinery.
  • the hydraulic fluid operating the hydraulic piston 35 may be part of the hydraulic circuit associated with the hydraulic hitch assembly
  • the reverse pressure applied to the checking valve to release the hydraulic ram 70 of the hitch assembly 51 is initially directed to the hydraulic piston of the safety device 10 thereby moving the safety device to the disengaged position just prior to releasing the hydraulic ram 70 of the hitch assembly 51.
  • the safety device 10 can be manipulated from the cabin of an excavator or the like and thereby not requiring the operator to descend from the cabin in order to disengage the safety device to remove and attach various attachments to the hydraulic hitch assembly 51.
  • this arrangement also provides the additional safety advantage that if there is indeed a hydraulic failure causing the hydraulic hitch assembly to retract, the safety device cannot be moved to the disengaged position as it would require hydraulic pressure to do so. Thus, the safety device would always be in the engaged position in the event of a hydraulic failure.
  • the safety device may also be fitted with display means (not shown in the figures).
  • the display means may be in the form of two flanges, one extending from the engagement end of the safety device 10 and the other extending from the end adjacent the pivoting point 15.
  • the flanges are arranged so as to be in a particular configuration when viewed from the cabin of the excavator such that the operator can be assured the safety device is in the engaged position.
  • a display means may be located in the actual cabin of the excavator or the like and be in the form of a light for example which when operated provides the operator with an indication of whether the safety device is in the engaged or disengaged state.
  • a check valve associated with a hydraulic ram of a typical hydraulic hitch assembly operates at a 3:1 ratio, that is the check valve can provide a captive pressure of 3000 PSI, which will maintain the hydraulic hitch assembly in an engaged position.
  • the check valve operates at a 3:1 ratio, it requires a reverse pressure of 1000 PSI to release after which the hydraulic hitch assembly will retract into the disengaged position.
  • the 1000 PSI of reverse pressure is provided to the hydraulic piston of the safety device before being applied to the check valve and this pressure is sufficient to operate the hydraulic piston to overcome the force of the biasing means thereby moving the safety device into the disengaged state and allowing the hitch assembly to move into the disengaged position.
  • the captive pressure holding the hydraulic ram of the hitch assembly may drop due to a number of reasons such as for example, there is a bypass of hydraulic pressure, the seals of the hydraulic ram are damaged, or there is contamination in the hydraulic fluid.
  • the required pressure to release the check valve will also fall according to the 3:1 ratio whereby the pressure required to release the check valve will not be sufficient to for the hydraulic piston of the safety device to overcome the force of the biasing means (eg a spring). This means that the safety device cannot be moved into the disengaged position, and thereby constantly monitors the safe working condition of the hydraulic hitch assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Shovels (AREA)
  • Transmission Devices (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

La présente invention concerne un dispositif de sécurité pour un ensemble d’attelage hydraulique pouvant être actionné entre une position engagée et dégagée. Le dispositif de sécurité ci-décrit comprend : une partie principale de corps qui peut être déplacée entre une position engagée et une position dégagée faisant que, quand la partie de corps principal se trouve en position engagée, le dispositif de sécurité empêche l’ensemble d’attelage hydraulique de passer à une position dégagée ; un moyen de contrainte servant à contraindre la partie de corps principal vers une position engagée ; et un piston hydraulique qui, quand on l’actionne, agit contre le moyen de contrainte et déplace la partie de corps principal vers une position dégagée.
EP06840375A 2005-12-12 2006-12-12 Dispositif de sécurité pour ensemble d'attelage hydraulique Withdrawn EP1963585A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005906979A AU2005906979A0 (en) 2005-12-12 Safety device for hydraulic hitch assembly
PCT/AU2006/001884 WO2007068043A1 (fr) 2005-12-12 2006-12-12 Dispositif de sécurité pour ensemble d’attelage hydraulique

Publications (1)

Publication Number Publication Date
EP1963585A1 true EP1963585A1 (fr) 2008-09-03

Family

ID=38162472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06840375A Withdrawn EP1963585A1 (fr) 2005-12-12 2006-12-12 Dispositif de sécurité pour ensemble d'attelage hydraulique

Country Status (9)

Country Link
US (1) US20090220326A1 (fr)
EP (1) EP1963585A1 (fr)
JP (1) JP5266060B2 (fr)
KR (1) KR100988203B1 (fr)
CN (1) CN101331278B (fr)
AU (1) AU2006324379B2 (fr)
CA (1) CA2631107C (fr)
NZ (1) NZ569184A (fr)
WO (1) WO2007068043A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL1852555T3 (pl) * 2006-05-02 2013-01-31 Kinshofer Gmbh Zabezpieczające urządzenie blokujące szybkozłącza
AT507598B1 (de) * 2008-12-05 2012-03-15 Wacker Neuson Linz Gmbh Vorrichtung zum auswechselbaren aufnehmen von werkzeugen
FR2944534B1 (fr) * 2009-04-20 2016-09-23 Morin Module de blocage pour un ensemble d'attache rapide d'un outil sur un engin de travaux publics.
AT510095B1 (de) * 2010-07-06 2012-06-15 Erna Kronberger Insektenschutzvorrichtung
NZ611044A (en) * 2010-11-12 2014-09-26 Stuart Alexander Essex A hydraulic hitch assembly
US20140294497A1 (en) * 2013-04-02 2014-10-02 Caterpillar Inc. Locking system for quick coupler

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AU4412285A (en) * 1984-12-07 1986-06-12 Jones, P.O. Quick-release hitch
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Also Published As

Publication number Publication date
CA2631107C (fr) 2014-08-05
NZ569184A (en) 2011-12-22
US20090220326A1 (en) 2009-09-03
JP2009518588A (ja) 2009-05-07
WO2007068043A1 (fr) 2007-06-21
CN101331278A (zh) 2008-12-24
JP5266060B2 (ja) 2013-08-21
AU2006324379A1 (en) 2007-06-21
CA2631107A1 (fr) 2007-06-21
CN101331278B (zh) 2011-06-29
KR20080091431A (ko) 2008-10-13
KR100988203B1 (ko) 2010-10-18
AU2006324379B2 (en) 2012-09-27

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