EP3040482A1 - Quick coupler for construction machine - Google Patents
Quick coupler for construction machine Download PDFInfo
- Publication number
- EP3040482A1 EP3040482A1 EP13892160.6A EP13892160A EP3040482A1 EP 3040482 A1 EP3040482 A1 EP 3040482A1 EP 13892160 A EP13892160 A EP 13892160A EP 3040482 A1 EP3040482 A1 EP 3040482A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wedge
- hydraulic cylinder
- rod
- quick coupler
- construction machine
- 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- Withdrawn
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Classifications
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- 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
- E02F3/364—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat using wedges
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- 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
- E02F3/3627—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 longitudinal locking element
Definitions
- the present invention relates to a quick coupler for a construction machine. More particularly, the present invention relates to such a quick coupler for a construction machine in which first and second wedges, a hydraulic cylinder, and a rod are moved within a preset range for the replacement or the installation and removal of an attachment such as a bucket or a breaker so that the coupling and decoupling operation between the wedges and fastening pins can be performed in a secure and safe manner.
- a construction machine such as an excavator is utilized to load and transport or crush earth and sand or wood on a construction site.
- the construction machine is advantageous to the digging or the loading and transport.
- the construction machine is suitable for crush the ground surface of a road or rocks and concrete.
- the construction machine is configured to replace or assemble an arm or a bucket of the construction machine with attachments including various work apparatuses and option apparatuses so as to fit the use of a work required using a quick coupler.
- the research and development on the quick coupler is in progress.
- a quick coupler for a heavy construction machine is disclosed in Korean Patent Laid-Open Publication No. 2012-0071839 (laid-opened on July 3, 2012).
- Fig. 1 is a schematic view showing a quick coupler for a heavy construction machine in accordance with the prior art.
- a cylinder 3 for driving wedges 1 and 2 fastened to the attachment 4 is installed in the quick coupler 10, and the wedges 1 and 2 are installed at both sides of the cylinder 3, respectively.
- the wedges 1 and 2 are moved by the drive of the cylinder 3 so as to be fastened to the attachment 4.
- the quick coupler 10 is typically mounted at a front end portion of an arm, and the wedges 1 and 2 are moved by the articular motion of link members (not shown) connected to the cylinder 3 for the coupling and fixing of the wedges to a pair of opposed fastening pins 5.
- the conventional quick coupler entails a problem in that it includes a plurality of link members, leading to complexity of a structure thereof.
- a single lock type quick coupler in which one sides of the wedges are fixed is also used on a construction site.
- a single lock type quick coupler encounters a problem in that one of two wedges is moved and coupled to one of the fastening pins in a state in which the other of two wedges is fixed to a main body of the quick coupler, and thus the coupling between the wedges and the fastening pins is performed incompletely.
- the single lock type quick coupler has a disadvantage in that when any one of the wedges is decoupled from the fastening pin or the coupling between the wedges and the fastening pins is performed incompletely, a safety accident may occur.
- the present invention has been made to solve the aforementioned problems occurring in the prior art, and it is an object of the present invention to provide a quick coupler for a construction machine in which the movement of first and second wedges and the movement of a hydraulic cylinder and a rod are effectively performed within a preset range for the replacement or the installation and removal of an attachment such as a bucket or a breaker so that the coupling and decoupling operation between the wedges and fastening pins can be performed in a secure and safe manner.
- Another object of the present invention is to provide a quick coupler for a construction machine in which the quick coupler is structurally assembled in a simple manner so that it can be installed and removed in a rapid and easy manner although various attachments are replaced depending on a specification of the machine on a construction site.
- a quick coupler for a construction machine including:
- the quick coupler for a construction machine in accordance with the present invention may further includes an elastic member installed inside the large chamber of the hydraulic cylinder, the elastic member being configured to elastically support a rear end portion of the wedge fixture at one side thereof and a front end portion of the rod at the other side thereof.
- the quick coupler for a construction machine in accordance with the present invention may further include a rod stopper configured to restrict a maximum extending range of the rod in the hydraulic cylinder so that the coupling state between the first wedge, the second wedge and the coupling fastening pins is securely maintained.
- the quick coupler for a construction machine in accordance with the present invention may further include a support block configured to restrict a maximum projecting range of the second wedge in a state where the left side wall of the main body is bought into close contact with the guide of the second wedge so that the coupling state between the second wedge and the other of the coupling fastening pins is securely maintained.
- the main body of the quick coupler may be fixedly installed on a base end portion of an arm so that various attachments required depending on a construction site or a work object can be easily replaced.
- the quick coupler for a construction machine in accordance with the present invention as constructed above has the following advantages.
- the movement of the hydraulic cylinder and the wedges is restricted by the stopper in an initial wedge decoupling position for the removal of the attachment, and the movement of the wedges and the movement of the hydraulic cylinder and the rod are restricted by the guide and the rod stopper in a wedge coupling position for the installation of the attachment so that the removal and installation operation of the attachment is effectively performed.
- the quick coupler for a construction machine in accordance with the present invention has an advantage in that the coupling and decoupling operation between the wedges and the coupling fastening pins can be performed in a secure and safe manner within a preset range during the installation or removal of the attachment.
- the quick coupler for a construction machine in accordance with the present invention has another advantage in that it is driven by the hydraulic pressure and the mechanical coupling between the stopper and the guide so that the replacement operation of the attachment can be easily performed in a construction site.
- Fig. 2 is a schematic cross-sectional view showing a quick coupler for a construction machine in accordance with one embodiment of the present invention
- Fig. 3 is a schematic cross-sectional view showing the coupling state of the wedges in a quick coupler as shown in Fig. 2
- Fig. 4 is a schematic cross-sectional view showing a quick coupler for a construction machine in accordance with another embodiment of the present invention.
- a reference numeral 21 denotes a main body of a quick coupler in accordance with the present invention
- a reference numeral 28 denotes a first wedge
- a reference numeral 29 denotes a second wedge
- a reference numeral 30 denotes a hydraulic cylinder
- a reference numeral 31 denotes a stopper
- a reference numeral 32 denotes a large chamber
- a reference numeral 33 denotes a small chamber
- a reference numeral 35 denotes a rod
- a reference numeral 36 denotes a rod stopper
- a reference numeral 39 denotes a support block
- a reference numeral 40 denotes a guide.
- the quick coupler for a construction machine in accordance with the present invention can easily perform the installation and removal operation of an attachment 4 for the replacement of the attachment 4 while the movement of the first wedge 28 and the second wedge 29 and the movement of the hydraulic cylinder 30 and the rod 35 in left and right directions are performed.
- the quick coupler for a construction machine in accordance with the present invention includes the main body 21 having hook parts 24 formed protrudingly outwardly from a left side wall 22 and a right side wall 23 thereof, respectively, to support a pair of opposed coupling fastening pins 25.
- the main body 21 and the hook parts 24 may have an external appearance of the same structure as that of typical known elements, and openings 26 for the withdrawal of the wedges may be formed on the main body 21 or the left side wall 22 and the right side wall 23.
- the hook parts 24 may be formed as a pair of curved structures having the same shapes, which are protruded toward the left and right side of the main body, and contact faces 24a of the hook parts 24 may have a structure in which the contact faces surround the outer circumferences of the coupling fastening pins 25
- the quick coupler for a construction machine in accordance with the present invention includes a hydraulic cylinder 30, a first wedge 28, a second wedge 29, and a stopper that restricts the movement of the hydraulic cylinder 30 an the second wedge 29.
- the hydraulic cylinder 30 includes a large chamber 32, a small chamber 33, a wedge fixture 37 fixed to an inlet of the large chamber 32, and a rod 35 driven to be extended or retracted in the hydraulic cylinder 30 by hydraulic pressure.
- the rod 35 is moved in a direction opposite to the wedge fixture 37 when the rod 35 is driven to be extended, and the hydraulic cylinder 30 includes through-holes 34a and 34b formed therein in such a manner as to fluidically communicate with the large chamber 32 and the small chamber 33 to perform the action of the hydraulic pressure.
- the hydraulic cylinder 30 can be supplied with hydraulic fluid from a hydraulic tank (not shown).
- a hydraulic tank not shown
- the first wedge 28 in accordance with the present invention is fixed to an outer end portion of the wedge fixture 37 and is coupled to or decoupled from one of the coupling fastening pins 25 through the movement of the hydraulic cylinder 30.
- the second wedge29 includes a guide 40 formed protrudingly downwardly from the main body 21 and is fixed to an outer end portion of the rod 35.
- the wedge fixture 37 and the first wedge 28 are fixedly fastened in a fastening manner by a pin 41 or a bolt fastening manner during the assembly thereof, and the rod and the second wedge 29 may also be fixedly fastened in a fastening manner by a pin 41 or a bolt fastening manner during the assembly thereof.
- the second wedge 29 is moved in a direction opposite to the first wedge 28 when the rod 35 is extended or retracted so that the second wedge is coupled to or decoupled from the other of the coupling fastening pins 25.
- the first wedge 28 and the second wedge 29 are moved in a direction far away from each other when the rod 35 is extended so that the first wedge 28 and the second wedge 29 can be coupled to the coupling fastening pins 25.
- the first wedge 28 and the second wedge 29 are moved in a direction close to each other when the rod 35 is retracted so that the first wedge 28 and the second wedge 29 can be decoupled from the coupling fastening pins 25.
- the stopper 31 in accordance with the present invention is installed between the hydraulic cylinder 30 and the second wedge 29 and is configured to restrict the movement of the hydraulic cylinder 30 which is moved to allow the second wedge to be decoupled from the fastening pin 25 and the movement of the second wedge 29.
- the stopper 31 may be configured as a rectangular block unit made of a steel material to support a force acting on the hydraulic cylinder 30 and the second wedge 29, and the force may act on the hydraulic cylinder 30 and the second wedge 29 simultaneously or separately from both sides of the stopper 31.
- the stopper 31 may be formed as a rectangular structure having a left side surface and a right side surface, which are protruded outwardly from a bottom of the main body 21, and various geometric modifications of the stopper 31 are possible in consideration of a stress or an external force required for the first wedge 28 and the second wedge 29.
- the quick coupler includes an elastic member 42 installed inside the large chamber 32 of the hydraulic cylinder 30.
- the elastic member elastically supports a rear end portion of the wedge fixture 37 at one side thereof and a front end portion of the rod 35 at the other side thereof.
- the quick coupler for a construction machine in accordance with the present invention includes a rod stopper 36 installed in the hydraulic cylinder 30 so that a maximum extending range of the rod 35 is restricted by the rod stopper 36.
- a rod stopper 36 installed in the hydraulic cylinder 30 so that a maximum extending range of the rod 35 is restricted by the rod stopper 36.
- the quick coupler may include a support block 39 configured to restrict a maximum projecting range of the second wedge 29 in a state where the left side wall 22 of the main body 21 is bought into close contact with the guide 40 of the second wedge 29.
- the support block 39 may be integrally formed with the left side wall 22 of the bottom surface of the main body 21.
- the main body 21 of the quick coupler is fixedly installed on a base end portion of an arm.
- an operator may replace a bucket with various attachments including a breaker and the like.
- the hydraulic cylinder 30 and the first and second wedges 28 and 29 are driven from an initial position for the decoupling of the wedges to a mounting position for the coupling of the wedges.
- the hydraulic cylinder 30 and the first and second wedges 28 and 29 are positioned in an initial position for the decoupling of the wedges from the coupling fastening pins 25.
- the hydraulic cylinder 30 connected to the first wedge 28 is positioned in proximity to the right side of the stopper 31
- the second wedge 29 connected to the hydraulic cylinder 30 through the rod 35 is positioned in proximity to the left side of the stopper 31.
- the guide 40 of the second wedge 29 connected to the hydraulic cylinder 30 through the rod 35 is installed in proximity to the left side of the stopper 31.
- the hydraulic cylinder 30 maintains a balanced state or a stationary state where there is no movement of the rod to the left or right on the drawing sheet by means of the hydraulic pressure formed in the large chamber 32 and the small chamber 33 thereof.
- first wedge 28 and the second wedge 29 are maintained in a state of being decoupled from the coupling fastening pins 25, respectively.
- FIG. 3 the mounting state for the coupling of the wedges to the coupling fastening pins 25 is shown in Fig. 3 .
- the hydraulic cylinder 30, the rod 35, the first wedge 28, and the second wedge 29, which are moved in the main body 21, are positioned in the mounting position for the coupling of the wedges to the coupling fastening pins 25.
- the rod 35 is extended from the hydraulic cylinder 30 by the hydraulic pressure formed in the large chamber 32 and the first wedge 28 connected to the hydraulic cylinder 30 through the wedge fixture 37 is moved to the right on the drawing sheet by its reaction force.
- the movement of the first wedge 28 is restricted by the contact support between the wedge fixture 37 and the right side wall 23 of the main body 21, and an inclined face of the first wedge 28 supports the outer circumference of one of the coupling fastening pins 25.
- the second wedge 29 is moved to the maximum extending range of the rod 35.
- the second wedge 29 is moved to a position where an inclined face of the second wedge 29 sufficiently supports the outer circumference of the other of the coupling fastening pins 25, the movement of the second wedge 29 is restricted by the contact support between the guide 40 and the left side wall 22 of the main body 21 or the support block 39.
- the hydraulic cylinder 30, the rod 35, the first wedge 28 and the second wedge 29 in the main body 21 are moved to a direction opposite to the mounting position of the wedges so that the hydraulic cylinder 30, the rod 35, the first wedge 28 and the second wedge 29 return to the initial position for the decoupling of the wedges from the coupling fastening pins 25.
- the coupling and decoupling position of the wedges for the replacement or installation/removal of the attachment is set accurately, and thus an operator can perform the assembly and replacement operation of the attachment in an easy and safe manner on a construction site.
- the quick coupler for a construction machine of the present invention as constructed above is useful for safe and efficient replacement and assembly of various attachments including a breaker or other option apparatus required depending on construction site or a work object.
Abstract
Description
- The present invention relates to a quick coupler for a construction machine. More particularly, the present invention relates to such a quick coupler for a construction machine in which first and second wedges, a hydraulic cylinder, and a rod are moved within a preset range for the replacement or the installation and removal of an attachment such as a bucket or a breaker so that the coupling and decoupling operation between the wedges and fastening pins can be performed in a secure and safe manner.
- In general, a construction machine such as an excavator is utilized to load and transport or crush earth and sand or wood on a construction site. For example, in the case where a bucket as a work apparatus or an attachment of the excavator is assembles, the construction machine is advantageous to the digging or the loading and transport. In the case where the bucket is replaced with a breaker or a crusher assembled to the construction machine as an option apparatus, the construction machine is suitable for crush the ground surface of a road or rocks and concrete.
- As such, the construction machine is configured to replace or assemble an arm or a bucket of the construction machine with attachments including various work apparatuses and option apparatuses so as to fit the use of a work required using a quick coupler. The research and development on the quick coupler is in progress.
- As one of the prior arts related to the above-mentioned quick coupler, a quick coupler for a heavy construction machine is disclosed in Korean Patent Laid-Open Publication No.
2012-0071839 Fig. 1 is a schematic view showing a quick coupler for a heavy construction machine in accordance with the prior art. - Referring to
Fig. 1 , in the conventional quick coupler used to mount an attachment such as a bucket to the heavy construction machine, acylinder 3 for drivingwedges 1 and 2 fastened to theattachment 4 is installed in thequick coupler 10, and thewedges 1 and 2 are installed at both sides of thecylinder 3, respectively. Thewedges 1 and 2 are moved by the drive of thecylinder 3 so as to be fastened to theattachment 4. Thequick coupler 10 is typically mounted at a front end portion of an arm, and thewedges 1 and 2 are moved by the articular motion of link members (not shown) connected to thecylinder 3 for the coupling and fixing of the wedges to a pair ofopposed fastening pins 5. - However, the conventional quick coupler entails a problem in that it includes a plurality of link members, leading to complexity of a structure thereof.
- Besides, the above-mentioned link type quick coupler, a single lock type quick coupler in which one sides of the wedges are fixed is also used on a construction site. However, such a single lock type quick coupler encounters a problem in that one of two wedges is moved and coupled to one of the fastening pins in a state in which the other of two wedges is fixed to a main body of the quick coupler, and thus the coupling between the wedges and the fastening pins is performed incompletely. In addition, the single lock type quick coupler has a disadvantage in that when any one of the wedges is decoupled from the fastening pin or the coupling between the wedges and the fastening pins is performed incompletely, a safety accident may occur.
- Accordingly, the present invention has been made to solve the aforementioned problems occurring in the prior art, and it is an object of the present invention to provide a quick coupler for a construction machine in which the movement of first and second wedges and the movement of a hydraulic cylinder and a rod are effectively performed within a preset range for the replacement or the installation and removal of an attachment such as a bucket or a breaker so that the coupling and decoupling operation between the wedges and fastening pins can be performed in a secure and safe manner.
- Another object of the present invention is to provide a quick coupler for a construction machine in which the quick coupler is structurally assembled in a simple manner so that it can be installed and removed in a rapid and easy manner although various attachments are replaced depending on a specification of the machine on a construction site.
- To achieve the above object, in accordance with an embodiment of the present invention, there is provided a quick coupler for a construction machine, including:
- a main body having a pair of opposed hook parts formed protrudingly outwardly from a left side wall and a right side wall thereof, respectively, to support a pair of opposed coupling fastening pins;
- a hydraulic cylinder including a large chamber, a small chamber, a wedge fixture fixed to an inlet of the large chamber, and a rod driven to be extended or retracted by hydraulic pressure and moved in a direction opposite to the wedge fixture when the rod is driven to be extended;
- a first wedge fixed to an outer end portion of the wedge fixture and coupled to or decoupled from one of the coupling fastening pins through the movement of the hydraulic cylinder;
- a second wedge including a guide formed protrudingly downwardly from the main body, the second wedge being fixed to an outer end portion of the rod and moved in a direction opposite to the first wedge when the rod is extended or retracted so that the second wedge is coupled to or decoupled from the other of the coupling fastening pins; and
- a stopper installed between the hydraulic cylinder and the second wedge and configured to restrict the movement of the hydraulic cylinder which is moved to allow the second wedge to be decoupled from the fastening pin and the movement of the second wedge.
- The quick coupler for a construction machine in accordance with the present invention may further includes an elastic member installed inside the large chamber of the hydraulic cylinder, the elastic member being configured to elastically support a rear end portion of the wedge fixture at one side thereof and a front end portion of the rod at the other side thereof.
- Also, the quick coupler for a construction machine in accordance with the present invention may further include a rod stopper configured to restrict a maximum extending range of the rod in the hydraulic cylinder so that the coupling state between the first wedge, the second wedge and the coupling fastening pins is securely maintained.
- In addition, the quick coupler for a construction machine in accordance with the present invention may further include a support block configured to restrict a maximum projecting range of the second wedge in a state where the left side wall of the main body is bought into close contact with the guide of the second wedge so that the coupling state between the second wedge and the other of the coupling fastening pins is securely maintained.
- In the quick coupler for a construction machine in accordance with a preferred embodiment of the present invention, the main body of the quick coupler may be fixedly installed on a base end portion of an arm so that various attachments required depending on a construction site or a work object can be easily replaced.
- The quick coupler for a construction machine in accordance with the present invention as constructed above has the following advantages.
- The movement of the hydraulic cylinder and the wedges is restricted by the stopper in an initial wedge decoupling position for the removal of the attachment, and the movement of the wedges and the movement of the hydraulic cylinder and the rod are restricted by the guide and the rod stopper in a wedge coupling position for the installation of the attachment so that the removal and installation operation of the attachment is effectively performed.
- In addition, the quick coupler for a construction machine in accordance with the present invention has an advantage in that the coupling and decoupling operation between the wedges and the coupling fastening pins can be performed in a secure and safe manner within a preset range during the installation or removal of the attachment.
- Further, the quick coupler for a construction machine in accordance with the present invention has another advantage in that it is driven by the hydraulic pressure and the mechanical coupling between the stopper and the guide so that the replacement operation of the attachment can be easily performed in a construction site.
- The above objects, other features and advantages of the present invention will become more apparent by describing the preferred embodiments thereof with reference to the accompanying drawings, in which:
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Fig. 1 is a schematic view showing a quick coupler for a heavy construction machine in accordance with the prior art; and -
Fig. 2 is a schematic cross-sectional view showing a quick coupler for a construction machine in accordance with one embodiment of the present invention; -
Fig. 3 is a schematic cross-sectional view showing the coupling state of the wedges in a quick coupler as shown inFig. 2 ; and -
Fig. 4 is a schematic cross-sectional view showing a quick coupler for a construction machine in accordance with another embodiment of the present invention. - Now, a quick coupler for a construction machine in accordance with preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The matters defined in the description, such as the detailed construction and elements, are nothing but specific details provided to assist those of ordinary skill in the art in a comprehensive understanding of the invention, and the present invention is not limited to the embodiments disclosed hereinafter.
- In order to definitely describe the present invention, a portion having no relevant to the description will be omitted, and through the specification, like elements are designated by like reference numerals.
- In the specification and the claims, when a portion includes an element, it is meant to include other elements, but not exclude the other elements unless otherwise specifically stated herein.
- The terms or words used in the specification and the claims of the present invention should not be construed as being typical or dictionary meanings, but should be construed as meanings and concepts conforming to the technical spirit of the present invention on the basis of the principle that an inventor can properly define the concepts of the terms in order to describe his or her invention in the best way.
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Fig. 2 is a schematic cross-sectional view showing a quick coupler for a construction machine in accordance with one embodiment of the present invention,Fig. 3 is a schematic cross-sectional view showing the coupling state of the wedges in a quick coupler as shown inFig. 2 , andFig. 4 is a schematic cross-sectional view showing a quick coupler for a construction machine in accordance with another embodiment of the present invention. - In the drawings, a
reference numeral 21 denotes a main body of a quick coupler in accordance with the present invention, areference numeral 28 denotes a first wedge, areference numeral 29 denotes a second wedge, areference numeral 30 denotes a hydraulic cylinder, areference numeral 31 denotes a stopper, areference numeral 32 denotes a large chamber, areference numeral 33 denotes a small chamber, areference numeral 35 denotes a rod, areference numeral 36 denotes a rod stopper, areference numeral 39 denotes a support block, and areference numeral 40 denotes a guide. - The quick coupler for a construction machine in accordance with the present invention can easily perform the installation and removal operation of an
attachment 4 for the replacement of theattachment 4 while the movement of thefirst wedge 28 and thesecond wedge 29 and the movement of thehydraulic cylinder 30 and therod 35 in left and right directions are performed. - Referring to
Figs. 2 and 3 , the quick coupler for a construction machine in accordance with the present invention includes themain body 21 havinghook parts 24 formed protrudingly outwardly from aleft side wall 22 and aright side wall 23 thereof, respectively, to support a pair of opposedcoupling fastening pins 25. Themain body 21 and thehook parts 24 may have an external appearance of the same structure as that of typical known elements, andopenings 26 for the withdrawal of the wedges may be formed on themain body 21 or theleft side wall 22 and theright side wall 23. - In addition, the
hook parts 24 may be formed as a pair of curved structures having the same shapes, which are protruded toward the left and right side of the main body, and contact faces 24a of thehook parts 24 may have a structure in which the contact faces surround the outer circumferences of the coupling fasteningpins 25 - Preferably, the quick coupler for a construction machine in accordance with the present invention includes a
hydraulic cylinder 30, afirst wedge 28, asecond wedge 29, and a stopper that restricts the movement of thehydraulic cylinder 30 an thesecond wedge 29. - More specifically, the
hydraulic cylinder 30 includes alarge chamber 32, asmall chamber 33, awedge fixture 37 fixed to an inlet of thelarge chamber 32, and arod 35 driven to be extended or retracted in thehydraulic cylinder 30 by hydraulic pressure. - The
rod 35 is moved in a direction opposite to thewedge fixture 37 when therod 35 is driven to be extended, and thehydraulic cylinder 30 includes through-holes large chamber 32 and thesmall chamber 33 to perform the action of the hydraulic pressure. Thehydraulic cylinder 30 can be supplied with hydraulic fluid from a hydraulic tank (not shown). In addition, it will be easily understood by a person of ordinary skill in the art that when the hydraulic pressure is supplied to thehydraulic cylinder 30 through the through-hole 34a of thelarge chamber 32, it can be returned to the hydraulic tank (not shown). - The
first wedge 28 in accordance with the present invention is fixed to an outer end portion of thewedge fixture 37 and is coupled to or decoupled from one of the coupling fasteningpins 25 through the movement of thehydraulic cylinder 30. The second wedge29 includes aguide 40 formed protrudingly downwardly from themain body 21 and is fixed to an outer end portion of therod 35. Thewedge fixture 37 and thefirst wedge 28 are fixedly fastened in a fastening manner by apin 41 or a bolt fastening manner during the assembly thereof, and the rod and thesecond wedge 29 may also be fixedly fastened in a fastening manner by apin 41 or a bolt fastening manner during the assembly thereof. - The
second wedge 29 is moved in a direction opposite to thefirst wedge 28 when therod 35 is extended or retracted so that the second wedge is coupled to or decoupled from the other of thecoupling fastening pins 25. For example, thefirst wedge 28 and thesecond wedge 29 are moved in a direction far away from each other when therod 35 is extended so that thefirst wedge 28 and thesecond wedge 29 can be coupled to thecoupling fastening pins 25. On the other hand, thefirst wedge 28 and thesecond wedge 29 are moved in a direction close to each other when therod 35 is retracted so that thefirst wedge 28 and thesecond wedge 29 can be decoupled from the coupling fastening pins 25. - The
stopper 31 in accordance with the present invention is installed between thehydraulic cylinder 30 and thesecond wedge 29 and is configured to restrict the movement of thehydraulic cylinder 30 which is moved to allow the second wedge to be decoupled from thefastening pin 25 and the movement of thesecond wedge 29. - The
stopper 31 may be configured as a rectangular block unit made of a steel material to support a force acting on thehydraulic cylinder 30 and thesecond wedge 29, and the force may act on thehydraulic cylinder 30 and thesecond wedge 29 simultaneously or separately from both sides of thestopper 31. - In accordance with this embodiment, the
stopper 31 may be formed as a rectangular structure having a left side surface and a right side surface, which are protruded outwardly from a bottom of themain body 21, and various geometric modifications of thestopper 31 are possible in consideration of a stress or an external force required for thefirst wedge 28 and thesecond wedge 29. - In accordance with another embodiment, as shown in
Fig. 4 , the quick coupler includes anelastic member 42 installed inside thelarge chamber 32 of thehydraulic cylinder 30. The elastic member elastically supports a rear end portion of thewedge fixture 37 at one side thereof and a front end portion of therod 35 at the other side thereof. - The quick coupler for a construction machine in accordance with the present invention includes a
rod stopper 36 installed in thehydraulic cylinder 30 so that a maximum extending range of therod 35 is restricted by therod stopper 36. When therod 35 is extended to the outside of thehydraulic cylinder 30 in a maximum extending range, the coupling state between thefirst wedge 28/thesecond wedge 29 and the coupling fastening pins 25 is securely maintained by the hydraulic pressure formed in thehydraulic cylinder 30. - Meanwhile, in accordance with one embodiment of the present invention, the quick coupler may include a
support block 39 configured to restrict a maximum projecting range of thesecond wedge 29 in a state where theleft side wall 22 of themain body 21 is bought into close contact with theguide 40 of thesecond wedge 29. Thesupport block 39 may be integrally formed with theleft side wall 22 of the bottom surface of themain body 21. - In the quick coupler for a construction machine in accordance with a preferred embodiment of the present invention, the
main body 21 of the quick coupler is fixedly installed on a base end portion of an arm. In this case, an operator may replace a bucket with various attachments including a breaker and the like. - The embodiment and operating principle of the quick coupler for a construction machine in accordance with the present invention will be described hereinafter with reference to the accompanying drawing.
- In the quick coupler for a construction machine in accordance with the present invention, the
hydraulic cylinder 30 and the first andsecond wedges - For example, as shown in
Fig. 2 , thehydraulic cylinder 30 and the first andsecond wedges Fig. 2 , thehydraulic cylinder 30 connected to thefirst wedge 28 is positioned in proximity to the right side of thestopper 31, and thesecond wedge 29 connected to thehydraulic cylinder 30 through therod 35 is positioned in proximity to the left side of thestopper 31. - Preferably, the
guide 40 of thesecond wedge 29 connected to thehydraulic cylinder 30 through therod 35 is installed in proximity to the left side of thestopper 31. - In this process, the
hydraulic cylinder 30 maintains a balanced state or a stationary state where there is no movement of the rod to the left or right on the drawing sheet by means of the hydraulic pressure formed in thelarge chamber 32 and thesmall chamber 33 thereof. - Thus, the
first wedge 28 and thesecond wedge 29 are maintained in a state of being decoupled from the coupling fastening pins 25, respectively. - On the contrary, the mounting state for the coupling of the wedges to the coupling fastening pins 25 is shown in
Fig. 3 . In other words, thehydraulic cylinder 30, therod 35, thefirst wedge 28, and thesecond wedge 29, which are moved in themain body 21, are positioned in the mounting position for the coupling of the wedges to the coupling fastening pins 25. - For example, when the hydraulic fluid is injected into the
large chamber 32 of thehydraulic cylinder 30 through the through-hole 34a and simultaneously the hydraulic fluid in thesmall chamber 33 is discharged to the outside through the through-hole 34a, therod 35 is extended from thehydraulic cylinder 30 by the hydraulic pressure formed in thelarge chamber 32 and thefirst wedge 28 connected to thehydraulic cylinder 30 through thewedge fixture 37 is moved to the right on the drawing sheet by its reaction force. - In this case, the movement of the
first wedge 28 is restricted by the contact support between thewedge fixture 37 and theright side wall 23 of themain body 21, and an inclined face of thefirst wedge 28 supports the outer circumference of one of the coupling fastening pins 25. - In addition, the
second wedge 29 is moved to the maximum extending range of therod 35. In this case, when thesecond wedge 29 is moved to a position where an inclined face of thesecond wedge 29 sufficiently supports the outer circumference of the other of the coupling fastening pins 25, the movement of thesecond wedge 29 is restricted by the contact support between theguide 40 and theleft side wall 22 of themain body 21 or thesupport block 39. - In the meantime, in accordance with another embodiment of the present invention, as shown in
Fig. 4 , in the case where theelastic member 42 such as a spring is assembled in the large chamber, the hydraulic pressure and an elastic force are simultaneously exerted to therod 35 in the mounting position of the wedges, and thus the mounting position of the wedges is maintained in a more secure and safe manner. - If the hydraulic pressure is supplied to the small chamber of the hydraulic cylinder for the replacement of the
attachment 4 and simultaneously the hydraulic pressure is discharged from the large chamber of the hydraulic cylinder to the outside, thehydraulic cylinder 30, therod 35, thefirst wedge 28 and thesecond wedge 29 in themain body 21 are moved to a direction opposite to the mounting position of the wedges so that thehydraulic cylinder 30, therod 35, thefirst wedge 28 and thesecond wedge 29 return to the initial position for the decoupling of the wedges from the coupling fastening pins 25. - As such, in accordance with the quick coupler for a construction machine in accordance with the present invention, the coupling and decoupling position of the wedges for the replacement or installation/removal of the attachment is set accurately, and thus an operator can perform the assembly and replacement operation of the attachment in an easy and safe manner on a construction site.
- The quick coupler for a construction machine of the present invention as constructed above is useful for safe and efficient replacement and assembly of various attachments including a breaker or other option apparatus required depending on construction site or a work object.
- While the present invention has been described in connection with the specific embodiments illustrated in the drawings, they are merely illustrative, and the invention is not limited to these embodiments. It is to be understood that various equivalent modifications and variations of the embodiments can be made by a person having an ordinary skill in the art without departing from the spirit and scope of the present invention. Therefore, the true technical scope of the present invention should not be defined by the above-mentioned embodiments but should be defined by the appended claims and equivalents thereof.
Claims (5)
- A quick coupler for a construction machine, comprising:a main body having a pair of opposed hook parts formed protrudingly outwardly from a left side wall and a right side wall thereof, respectively, to support a pair of opposed coupling fastening pins;a hydraulic cylinder including a large chamber, a small chamber, a wedge fixture fixed to an inlet of the large chamber, and a rod driven to be extended or retracted by hydraulic pressure and moved in a direction opposite to the wedge fixture when the rod is driven to be extended;a first wedge fixed to an outer end portion of the wedge fixture and coupled to or decoupled from one of the coupling fastening pins through the movement of the hydraulic cylinder;a second wedge including a guide formed protrudingly downwardly from the main body, the second wedge being fixed to an outer end portion of the rod and moved in a direction opposite to the first wedge when the rod is extended or retracted so that the second wedge is coupled to or decoupled from the other of the coupling fastening pins; anda stopper installed between the hydraulic cylinder and the second wedge and configured to restrict the movement of the hydraulic cylinder which is moved to allow the second wedge to be decoupled from the fastening pin and the movement of the second wedge.
- The quick coupler for a construction machine according to claim 1, further comprising an elastic member installed inside the large chamber of the hydraulic cylinder, the elastic member being configured to elastically support a rear end portion of the wedge fixture at one side thereof and a front end portion of the rod at the other side thereof.
- The quick coupler for a construction machine according to claim 2, further comprising a rod stopper configured to restrict a maximum extending range of the rod in the hydraulic cylinder.
- The quick coupler for a construction machine according to claim 3, further comprising a support block configured to restrict a maximum projecting range of the second wedge in a state where the left side wall of the main body is bought into close contact with the guide of the second wedge.
- The quick coupler for a construction machine according to claim 1 or 3, wherein the main body of the quick coupler is fixedly installed on a base end portion of an arm.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/KR2013/007851 WO2015030282A1 (en) | 2013-08-30 | 2013-08-30 | Quick coupler for construction machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3040482A1 true EP3040482A1 (en) | 2016-07-06 |
EP3040482A4 EP3040482A4 (en) | 2017-04-19 |
Family
ID=52586819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13892160.6A Withdrawn EP3040482A4 (en) | 2013-08-30 | 2013-08-30 | Quick coupler for construction machine |
Country Status (3)
Country | Link |
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EP (1) | EP3040482A4 (en) |
KR (1) | KR20160041944A (en) |
WO (1) | WO2015030282A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11421394B2 (en) | 2016-08-18 | 2022-08-23 | Daemo Engineering Co., Ltd. | Double safety device for quick coupler |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2016365527B2 (en) * | 2015-12-07 | 2022-04-21 | Wedgelock Equipment Limited | A locking device for a quick coupler |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9214255D0 (en) * | 1992-07-04 | 1992-08-19 | Massey Ferguson Mfg | Implement attachement coupler |
US6902346B2 (en) * | 2002-03-15 | 2005-06-07 | Hendrix Manufacturing, Ltd. | Hydraulic coupler |
NO20050638D0 (en) * | 2005-02-04 | 2005-02-04 | Gjerstad Mek Ind As | Reversible quick coupler |
JP5237561B2 (en) * | 2007-01-16 | 2013-07-17 | 株式会社室戸鉄工所 | Attachment coupler |
EP2362024A2 (en) * | 2010-02-26 | 2011-08-31 | Viby Attachment Worldwide A/S | Quick hitch for a digging or loading tool |
KR101727635B1 (en) | 2010-12-23 | 2017-04-17 | 볼보 컨스트럭션 이큅먼트 에이비 | Quick coupler for construction equipment |
GB201109675D0 (en) * | 2011-06-09 | 2011-07-27 | Monaghan Conor | Hitch coupler |
KR101210833B1 (en) * | 2012-07-26 | 2012-12-11 | 주식회사 필엔지니어링 | Automatic safety device for quick coupler |
-
2013
- 2013-08-30 KR KR1020167004767A patent/KR20160041944A/en not_active Application Discontinuation
- 2013-08-30 WO PCT/KR2013/007851 patent/WO2015030282A1/en active Application Filing
- 2013-08-30 EP EP13892160.6A patent/EP3040482A4/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2015030282A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11421394B2 (en) | 2016-08-18 | 2022-08-23 | Daemo Engineering Co., Ltd. | Double safety device for quick coupler |
Also Published As
Publication number | Publication date |
---|---|
KR20160041944A (en) | 2016-04-18 |
EP3040482A4 (en) | 2017-04-19 |
WO2015030282A1 (en) | 2015-03-05 |
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