KR101338036B1 - Automatic safety device for quick coupler - Google Patents

Abstract

The present invention relates to an automatic safety device for quick couplers used for connecting attachments to an arm of heavy equipment such as excavators. The present invention is capable of user convenience and stability by performing a safety device formed in a new typed latch combination automatically locked/unlocked while a cylinder for operating a driving hook of a quick coupler to connect/separate the attachments such as buckets or breakers is interlocked. The present invention provides the automatic safety device for the quick couplers, capable of maintaining a stable connection state of attachment pins and preventing safety accidents even if external force is frequently applied in a work.

Description

Automatic safety device for quick coupler

The present invention relates to an automatic safety device for a quick coupler, and more particularly, to an automatic safety device for a quick coupler used when coupling the attachment to the arm of heavy equipment such as an excavator.

In general, heavy equipment such as excavators used in construction sites or civil engineering sites are widely used construction equipment such as road works, water and sewage works, building foundation works, and earth and sand collecting works, and various attachments are selected according to the purpose of the work. Can be mounted to work.

For example, digging using buckets, crushing and reinforcing concrete buildings using crushers, breaking rocks and concrete using breakers, and scrap and rock transportation using grabs Depending on the application, such as vertical shaft and water supply and sewage building foundation work using clamshell bucket, various kinds of attachments can be replaced while various kinds of attachments can be performed.

The attachment is coupled to the structure of the excavator arm and detachable structure, and can be replaced according to the purpose of the work, and recently, a quick coupler that can easily connect the attachment has been developed and widely used.

That is, the operator of the excavator can easily handle and use the attachment in such a way that the quick coupler mounted on the tip of the arm is coupled to or separated from the bucket or breaker by operating the lever.

In addition, the quick coupler is equipped with a safety device such as a safety pin, and prevents the risk of detachment of the attachment due to breakdown of the hydraulic cylinder or damage of the hydraulic hose in the quick coupler during work, and to prepare for various safety accidents. have.

For example, a quick coupler with a safety pin is disclosed in "Excavator Coupler" of Korean Utility Model No. 20-0225763, "Safety device of clamp for mounting an excavator bucket" of Korean Patent No. 10-0397586.

However, in the case of using the safety pin, the excavator driver or the assistant operator directly inserts or pulls the safety pin into the safety pin hole of the quick coupler, which is not only troublesome and difficult, but also takes a long time.

As such, in the case of the conventional quick coupler, the work is not only cumbersome due to the fastening of the safety pin manually, but there is a high risk of a safety accident, such that the operator often uses the safety pin without fastening the safety pin.

In order to solve this problem, Korean Patent No. 10-1096085 proposes "Quick coupler of excavator" including an automatic safety device made of a combination of an automatic locking cylinder and a locking projection.

However, since the safety device proposed by the quick coupler of the excavator should have a separate hydraulic cylinder, etc., it is not only structurally disadvantageous, but also a safety device such as a problem due to a failure of the hydraulic cylinder or damage to the hydraulic hose still exists. There is a disadvantage of low reliability.

In consideration of this point, "Automatic loading device of quick coupler" of Korean Patent No. 10-1210833 proposes a hitch that is automatically locked and released while interlocked with a movable hook operated by a hydraulic cylinder.

That is, the safety device of the structure that supports the hitch elastically by using a spring in the form of a coil that is installed on the top of the front end of the hitch installed in the body is proposed.

However, in the case of concrete destruction work using an attachment such as a breaker, the external force is frequently generated in the direction of lifting the hitch, and when the external force acts on the hitch with a force greater than the elastic force of the spring, the spring is compressed. There is a problem that the attachment pin is missing.

Meanwhile, International Patent Publication No. WO2008 / 051095 (published May 02, 2008) also proposes a "coupler" including an automatic safety device made of a combination of an automatic locking cylinder and a locking projection.

However, the coupler proposed in the publication is to slide back and forth by the hydraulic cylinder to walk the first connecting pin and the second connecting pin connecting the attachment to the coupler to the first dock and the second dock provided on both sides of the coupler, respectively. The second element is in a first position (with the first dock open, FIG. 9A), the second position (with the second element retracted and the first dock is closed by the first connecting pin retaining means, FIG. 9C) and Each position is moved to three positions (state in which the second connecting pin is caught in the second dock while the second element is advanced).

 That is, the second element moved forward and backward by the hydraulic cylinder to move to the three different positions for the engagement and release of the first and second connecting pins connecting the attachment to the first and second dock of the coupler Since there is a need for the attachment or disassembly of the attachment takes a long time.

Accordingly, the present invention has been made in view of the above, a new type of automatic locking and unlocking while interlocking with the cylinder side for operating the movable hook of the quick coupler for fastening and detaching attachments such as buckets and breakers. By implementing a safety device consisting of a latch combination, it is possible to ensure the convenience and safety of the operator, and to maintain a stable engagement state of the attachment pins even when external force is frequently applied during work. It is an object of the present invention to provide an automatic safety device of a quick coupler that can prevent and quickly perform the attachment or disassembly of attachments.

In order to achieve the above object, the automatic safety device of the quick coupler provided in the present invention has the following features.

The automatic safety device of the quick coupler is connected to the arm and the link device of the excavator by using the front and rear pin holes, the fixed hook formed on the rear lower portion of the body, and the rear end of the inner bottom of the body A cylinder supported by a cylinder pin, and a slide type movable hook which is positioned at the lower part of the front of the body and connected to the rod of the cylinder by a hook pin and linearly moves along the front and rear of the body to hold or release the attachment pin; Holds the attachment pin together with the fixed hook, which consists of two latch combinations which are located directly on the lower part of the rear of the body facing the fixed hook and are in contact with the movable hook side while being in contact with the movable hook side. It consists of a structure including a latch assembly to release.

Therefore, the automatic safety device of the quick coupler can secure the binding state of the stable attachment pin using the latch assembly, so that the attachment pin can be eliminated even when the external force generated during the concrete destruction work is frequently applied. In the end, it has features that can prevent the risk of safety accidents.

The latch assembly is supported by a latch structure of the rear end and is supported by a first latch that hangs the upper side of the attachment pin, and is supported by a rotatable structure by an intermediate cylinder pin and is in contact with the movable hook side through the lower end. A second latch that presses the first latch downward while being in contact with the first latch side, and a round that is movable back and forth while receiving elastic support by a spring at the rear end and that pushes the second latch while contacting the second latch side through the tip portion; The structure may include a bar.

Here, the first latch, the second latch, the round bar, the spring, etc. of the latch assembly is installed in a structure that is supported on the body portion side of the cylinder, it is preferable to form an assembly form with the cylinder side.

In addition, in the case of the second latch in the latch assembly, the bottom surface of the lower portion contacting the rear end of the movable hook is made of an inclined surface, and the bottom surface of the upper portion of the second latch contacting the front end of the round bar is made of a round surface. It is desirable to make the associated operation smooth.

In addition, in the case of a movable hook made of a slide type, it is desirable to be able to hold or release the attachment pin while receiving a linear movement guide along the slide grooves on both sides formed on the body by using the slide protrusions on both sides.

The automatic safety device of the quick coupler provided in the present invention has the following advantages.

First, by applying a safety device of the type that is automatically locked and released while interlocking with the movable hook operated by the cylinder for fastening and detaching the attachment, it is convenient to use and prevents the risk of mechanical damage or safety accident due to the fastening and detachment. It can prevent.

Second, by applying a safety device consisting of a combination of the first latch and the second latch, and the spring installed horizontally on the cylinder side in connection with each other, even when frequent external force is applied during work, the attachment pins firmly and stably The safety can be further improved.

Third, by combining the components of the safety device, such as two latches, springs and round bars in the form of one assembly on the cylinder side, there is a structurally simple and advantageous in terms of handling and maintenance.

Fourth, the movable hook moving forward and backward by the cylinder has two positions, namely, the first position (the movable hook is open) and the second position (the movable hook is moved forward, and the fixed hook is closed by the hitch pin. The attachment pin can be coupled or disassembled by moving one of the attachment pins to the movable hook), so that the attachment or disassembly of the attachment to the coupler can be quickly performed.

1 is an exploded perspective view showing a quick coupler having an automatic safety device according to an embodiment of the present invention;
Figure 2 is a perspective view showing a coupling coupled quick coupler is installed according to an embodiment of the present invention
3 is a perspective view showing an automatic safety device of the quick coupler according to an embodiment of the present invention
Figure 4 is a cross-sectional perspective view showing an automatic safety device of a quick coupler according to an embodiment of the present invention
5 is a cross-sectional view showing an automatic safety device of a quick coupler according to an embodiment of the present invention.
6 and 7 are cross-sectional views showing the operating state of the automatic safety device of the quick coupler according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view showing a quick coupler is provided with an automatic safety device according to an embodiment of the present invention, Figures 3 to 5 shows an automatic safety device of a quick coupler according to an embodiment of the present invention Perspective and sectional views.

As shown in Figures 1 to 5, the automatic safety device of the quick coupler is a combination of a movable hook and a latch assembly operating in conjunction with the slide type operating automatically, when the quick coupler is fastened and used automatically It is composed of the structure with convenience at the time of fastening and safety at the time of operation.

To this end, pin holes 10a and 10b for fastening with the female side of the excavator and the linkage device side and the pins on the front and the rear of the upper part, respectively, and a fixing hook 12 for fastening the attachment pins to the rear of the lower part are integrated. The formed body 11 is provided.

A predetermined space is formed inside the body 11, and the cylinder 14 and the slide type movable hook 16, which will be described later, may be installed therein.

In addition, the inner wall surface of the body 11 is provided with two slide grooves (27 and 7 in Fig. 6 and 7) formed side by side in the longitudinal direction of the body, the movable groove (27) in the slide groove (27) Slide protrusions 26 formed on both side portions of the 16 are inserted to receive the slide guide.

That is, the movable hook 16 can be guided by the slide protrusion 26 moving along the slide groove 27 during linear movement for fastening and detachment with the attachment pin.

In addition, the front upper portion of the body 11 is provided with a traction ring 30 is installed on the plate across the body space in the width direction, the traction ring 30 is a quick coupler is mounted on the excavator and the attachment is It can be used for useful purposes, such as transporting the workpiece in the unattached state.

In addition, a cylinder 14, for example, a hydraulic cylinder that operates hydraulically, is provided as an actuator means for operating the movable hook 16, and the cylinder 14 is formed at the inner bottom of the body 11 at this time. Side by side in the space is installed in a structure that is supported by the rod forward and the rear end.

For example, the cylinder 14 is positioned in a horizontal posture with the rods facing forward in the inner space of the body 11, and in this state the rear end of the cylinder body is formed by the cylinder pin 13. 11, it is installed in a structure supported by the cylinder pin 13 of the rear end.

In addition, the movable hook 16 is provided as a means for fastening the attachment pin by mating with the fixed hook 12, the movable hook 16 at this time is located in the lower front of the body 11, the cylinder 14 It is installed in a structure that is connected to the rod of the operation.

In particular, the movable hook 16 is made of a slide type that moves in a straight line along the front and rear direction of the body, unlike the movable hook of the rotary structure provided in the existing quick coupler, through these operating characteristics, the distance between the attachment pin is different Has an advantage that can be applied to the attachment.

To this end, both sides of the movable hook 16 is formed with a slide protrusion 26 protruding in parallel with the hook longitudinal direction, the slide protrusion 26 at this time is a slide groove ( 27).

Accordingly, the movable hook 16 can be moved while receiving a linear guide by using the slide protrusion 26 is inserted into the slide groove 27 and slides.

In addition, a pair of pin fastening portions 31a are formed above the distal end of the movable hook 16, and the pin fastening portions 31b in the rod of the cylinder 15 are formed between the pin fastening portions 31a at this time. These are fastened together by the hook pin 15 while being positioned so that the movable pin 16 can be hung or released while the movable hook 16 slides back and forth by the forward or backward operation of the cylinder 14.
In addition, a pair of extension portions 16a extending parallel to each other at a predetermined length from the rear side of both sides of the movable hook 16 toward the rear of the body 11 are provided, and the extension portion 16a at this time is According to the slide operation of the movable hook 16, the second latch 21 is rotated through contact with the second latch 21.

In addition, the movable hook 16 is provided with an oil supply device 32 as a means for lubricating oil on the hook slide portion, that is, the friction portion between the slide protrusion 26 and the slide groove portion 27.

The oil supply device 32 is mounted to the front end of the movable hook 15, and the oil injected through the oil hole (not shown) is formed on the side of the slide protrusion 26 through the movable hook inner flow path (not shown). It is possible to be supplied to the slide contact portion out of the), and the linear movement of the slide of the movable hook 16 can be made more smoothly by the oil supplied in this way.

In addition, the upper portion of the body 11 is closed by a cover 28, the cover 28 at this time may serve to protect the cylinder 14, etc. located inside thereof from external impact or foreign matter. Will be.

The latch assembly 18 is provided as a means for substantially performing the function of the safety device.

The latch assembly 18 is formed by holding or releasing the attachment pin together with the fixing hook 12 using two latch combinations that operate in conjunction with each other. Even in the case of operation, it is possible to exhibit the function of maintaining the stable attachment pin attachment state.

To this end, a first latch 20 having a rotatable structure supported by the latch pin 19 fastened to the rear end is provided, and the first latch 20 at this time is provided with a latch pin. It consists of a rectangular plate shape having a boss portion 20a of the rear end portion for fastening (19) and a hook portion 20b of the tip portion which can be held while partially wrapping the attachment pin.

The first latch 20 is positioned directly above the fixing hook 12 at the lower rear side of the body 11 and is positioned directly above the cylinder by the latch pin 19 fastened to the boss portion 20a of the rear end thereof. 14) is installed in a structure rotatably supported on the body portion 23 side.

That is, a bar member extending vertically is formed in the body portion 23 of the cylinder 14, and the bar member thus formed is inserted into a cutout in the boss portion 20a of the first latch 20. Since the boss portion 20a side of the first latch 20 and the bar member side of the body portion 23 are fastened together by the latch pin 19, the first latch 20 is coupled to the latch pin 19. While rotating toward the center, the attachment pin can be hooked through the hook portion 20b of the tip portion.
In addition, the first latch 20 can maintain the release state of the attachment pin (open state of the fixed hook) as the hook portion 20b of the tip is lifted up while being rotated by the contact with the movable hook 16. Will be.
That is, when the rear end is pressed by the movable hook 16 in a state in which the restraint by the second latch 21 described later is released, the first latch 20 at this time will have the hook portion 20b of the front end lifted up. It becomes possible, and eventually the fixing hook 12 is opened to be able to pull out the attachment pin.

Here, in the structure where the movable hook 16 is difficult to contact with the first latch 20 according to the structure of the quick coupler, the first latch 20 is used as a means for restoring the posture of the first latch 20. As a means to ensure that the hook portion (20b) of the always lifted up, the return pin (not shown) may be mounted to the latch pin fastening portion of the first latch 20, accordingly is pressed by the second latch 21 In the absence of the state, the hook portion 20b of the first latch 20 is lifted up by the return spring.

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A second latch 21 serving to press the first latch 20 downward while being supported by the rotatable structure by the cylinder pin 13 fastened in the middle is provided.

The second latch 21 is formed of a member having a substantially "C" shape, and is fastened together by the cylinder pin 13 in a state of being bound to the rear end of the body portion 23 of the cylinder 14, whereby It is installed in a structure that can be rotated around the cylinder pin (13).

The second latch 21 serves to press down the hook portion 20b of the first latch 20 while contacting the upper surface of the first latch 20, that is, the upper portion of the hook portion 20b through the lower portion. , The posture tilted obliquely by the contact with the extension portion 16a of the movable hook 16 through the lower end portion thereof, respectively, to maintain the posture vertically established by the contact with the round bar 22 described later through the upper end portion thereof. It becomes possible.

That is, in the upright position of the second latch 21 through the contact with the movable hook 16 and the round bar 22, the first latch 20 can be pressed downwards, The force applied to the one latch 20 side can be released.

For example, when the upper end of the second latch 21 is pushed by the forward movement of the round bar 22 and the second latch 21 has a vertical posture, the first latch 20 moves downward. When the lower end of the second latch 21 is pushed by the backward movement of the movable hook 16 and the second latch 21 is inclined, the first latch 20 is itself Lifted up by resilience.

In addition, the bottom surface of the lower end of the second latch 21 is formed of the inclined surface 24, so that it is possible to maintain a smooth contact relationship with the extension portion 16a of the movable hook 16, which is also made of the corresponding inclined surface. Since the rear surface of the upper end of the second latch 21 is also made of the rounded surface 25, it is possible to maintain a smooth contact relationship with the front end side of the round bar 22.

A spring 17 and a round bar 22 are provided as a means for converting the second latch 21 into a vertical posture, and the round bar 22 receives elastic support by the spring 17 at the rear end. While moving back and forth, it serves to push the rear surface of the upper end of the second latch 21 through its tip.

The spring 17 and the round bar 22 is installed in a horizontal position in the slide hole 29 formed in the body portion 23 of the cylinder 14, the tip of the round bar 22 is installed In the exposed state of the slide hole 29, the second latch 21 may be constantly in contact with the second latch 21.

Here, the spring 17 and the round bar 22 is preferably provided with a pair of left and right to maintain a balanced contact relationship with the second latch 21 side.

On the other hand, each part constituting the latch assembly 18, that is, the first latch 20 and the second latch 21, and the spring 17 and the round bar 22 is the body portion 23 of the cylinder 14 It is possible to form one assembly form as it is installed on both sides.

For example, the first latch 20 is installed in a pin structure on the lower end side of the body portion 23, the second latch 21 is installed in a pin structure on the rear end side of the body portion 23, Since the spring 17 and the round bar 22 are installed in a structure accommodated inside the upper end of the body 23, the entire cylinder 14 including each part of the latch assembly 18 forms an assembly form. Thus, it provides an advantage that can facilitate the operation of assembly, inspection, maintenance and the like.

Therefore, the operation state of the automatic safety device of the quick coupler configured as described above is as follows.

6 and 7 are cross-sectional views showing a locking operation state and a release operation state in the automatic safety device of the quick coupler according to an embodiment of the present invention.

As shown in Figure 6 and 7, first look at the locking state that the movable hook 16, the fixed hook 12 and the latch assembly 18 of the quick coupler is fastened to both of the attachment pin (100a, 100b) Is the same as

As the movable hook 16 slides toward the front of the body 11 by the forward operation of the cylinder 14, one of the attachment pins 100a is engaged, and at the same time, the other of the attachment pins 100b of the other The second latch 21 is erected by the round bar 22 pushed down by the spring 17 while the fixing hook 12 supports the lower side, and the lower end of the first latch 20 is pressed. Therefore, the first latch 20 at this time is bent down, and the attachment pin 100b is hooked through the hook portion 20b of the tip portion thereof.

In this way, one pin 100a of the attachment is automatically fastened by the movable hook 16 and the other pin 100b is automatically fastened by the first latch 20 and the fixed hook 12 above and below, An attachment such as a bucket can be easily attached to the quick coupler side.

Here, the process of fastening both the pins (100a, 100b) in the attachment, first hook the bottom of the attachment pin (100b) with a fixed hook 12, then operate the cylinder 14 to close the movable hook (16) In addition to the fastening of the attachment pin (100a) it can be made in the process of fastening the upper side of the attachment pin (100b) to the first latch 20 is pressed down by the spring force.

As described above, in the case of the attachment pin 100b fastened by the latch assembly 18 and the fixing hook 12, a round bar pushed horizontally, a second latch capable of maintaining a vertical position by the round bar at this time, Thus, it is fastened by the binding structure of the first latch pressed by the second latch of the vertical posture, and thus stable even when the external force is frequently applied in the up and down direction, that is, the direction of lifting the first latch, such as during concrete destruction work. The fastening state of the attachment pin can be maintained.

Next, look at the unlocked state of the attachment pin, that is, the open state in which the movable hook 16, the fixed hook 12, and the latch assembly 18 of the quick coupler are released from both of the attachment pins 100a and 100b. .

By the reverse operation of the cylinder 14, the movable hook 16 slides toward the rear of the body 11 and is detached from the attachment pin 100a on one side (the attachment pin is unlocked), and thus moves backward. The second latch 21 is rotated counterclockwise while its lower end is pushed by the contact with the extension portion 16a of the movable hook 16.
At the same time, as the cylinder 14 returns (reverses), the movable hook 16 slides to the rear of the fixed hook 16, and thus the hook portion of the movable hook 16, i.e., attachment pin ( The back side of the hook portion which hangs 100a) comes into contact with the rear end of the first latch 20, and thus the first latch 20 is rotated counterclockwise while its rear end is pressed down.

Subsequently, the second latch 21 rotating in the counterclockwise direction is flipped while pushing the round bar 22 forward through the upper end thereof, and the first latch released from the second latch 21 is restrained. 20, the hook portion 20b is lifted up and away from the attachment pin 100b on the other side (the attachment is unlocked), and eventually at the gap between the first latch 20 and the fixed hook 12. Since the attachment pin 100b can be pulled out, the attachment of the bucket or the like is removed from the quick coupler side to complete the work, or it can be replaced with another attachment.

As described above, in the present invention, both the hooks of the quick coupler are fastened to the attachment pin and the safety device, that is, the latch assembly is operated automatically, thereby solving the convenience and safety problems of the operator. By adopting a movable hook, it can be applied to attachments of various standards without having to modify the distance between the quick coupler hooks (the distance between the quick coupler hooks can be changed).

In particular, by applying a combination of horizontal springs and round bars, vertical second latches and first latches pressed by these second latches, frequent external forces act when concrete is broken using attachments such as breakers. In this case, it is possible to completely solve the problem of the attachment pins being removed, thereby increasing the safety and efficiency of the work.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Will be clear to those who have knowledge of.

10a, 10b: pinhole 11: body
12: fixed hook 13: cylinder pin
14 cylinder 15 hook pin
16: movable hook 17: spring
18 latch assembly 19 latch pin
20: first latch 21: second latch
22: round bar 23: body
24: inclined surface 25: round surface
26: slide protrusion 27: slide groove
28: cover 29: slide hole
30: traction ring 31a, 31b: pin fastening portion
32: oil supply device

Claims (5)

A body 11 connected and assembled to the arm and the linkage of the excavator by using the front and rear pin holes 10a and 10b;
A fixed hook (12) formed at a lower rear portion of the body (11);
A cylinder 14 supported on the inner bottom of the body 11 by using a cylinder pin 13 at a rear end thereof;
The slide-type movable is located in the lower front of the body 11 is connected to the rod of the cylinder 14 by the hook pin 15, and hold or release the attachment pin while moving linearly along the front and rear of the body 11 Hook 16;
Being located above the fixing hook 12 in the lower rear of the body 11, while being supported in a structure that can be rotated up and down about the latch pin 19 fastened to the rear end immediately above the fixing hook 12 It is supported by a vertically rotatable structure around the first latch 20 which hangs the upper side of the attachment pin and the cylinder pin 13 which is fastened in the middle from the upper side of the first latch 20, and through the lower part. The force which is to rotate by contacting the extension part 16a of the movable hook 16 in the downward direction of the cylinder pin 13 by adjusting the vertical rotation of the first latch while being in contact with the first latch 20. And a latch made of a combination of second latches 21 receiving a force to return in a direction opposite to the contact direction of the movable hook 16 while receiving elastic support by the spring 17 on the upper side of the cylinder pin 13. Assembly 18;
The extension portion 16a of the movable hook 16 is formed in a pair extending from the upper side of the rear end of the movable hook 16 to the rear side of the body 11 in a pair extending side by side with each other in a pair Automatic safety of the coupler.
The method according to claim 1,
The latch assembly 18 is movable back and forth while receiving elastic support by the spring 17 at the rear end and is in contact with the upper part of the second latch 21 in the upward direction of the cylinder pin 13 through the leading end thereof. Automatic safety device of the quick coupler characterized in that it further comprises a round bar (22) for pushing the latch (21).
The method according to claim 2,
The first latch 20, the second latch 21, and the round bar 22 of the latch assembly 18 are installed on the body 23 side of the cylinder 14 to support the cylinder 14. ) And the automatic safety device of the quick coupler, characterized in that to achieve a single assembly form.
The method according to claim 1,
As for the second latch 21 of the latch assembly 18, the lower surface of the lower end portion contacting the rear end of the movable hook 16 is formed of the inclined surface 24, and the rear surface of the upper end portion contacting the front end of the round bar 22 is rounded ( Automatic safety device of the quick coupler characterized in that consisting of 25).
The method according to claim 1,
The movable hook 16 is a slide type that can hold or release the attachment pin while linearly moving along the slide grooves 27 on both sides formed on the body 11 by using the slide protrusions 26 on both sides. Automatic safety device of the quick coupler characterized in that made.

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