KR20160017853A - Locking device for quick coupler - Google Patents

Abstract

The present invention relates to a safety locking device for a quick coupler to safely couple a working apparatus to a quick coupler coupled to a front end of an arm of an excavator. The safety locking device for a quick coupler comprises a safety locking means having a fixing hook, an operating hook, an operating side hitch, and a fixing side hitch. Moreover, provided is the safety locking device for a quick coupler, which enables a length of an operating bar which is in contact with an external side surface of the operating hook to be interlocked and operated to be adjusted, thereby preventing malfunction and operation inability of the safety locking means.

Description

{Locking device for quick coupler}

The present invention relates to a safety lock device for a quick coupler, and more particularly, to a safety lock device for a quick coupler that can secure safety by preventing a lock state from being arbitrarily released when a work mechanism such as a bucket is mounted and fixed to a quick coupler To a safety lock device.

In general, a quick coupler is a work mechanism that can be mounted or dismounted by a hydraulic pressure from a driver's seat, such as a bucket, a tongs and a breaker mounted on the tip of a work vehicle such as an excavator, and a work mechanism such as a bucket is mounted on the quick coupler It is necessary to ensure safety that the lock state is not arbitrarily released due to damage or malfunction of the cylinder or the like.

 A connecting device for a working device for an excavator having safety of the quick coupler is disclosed in the registered utility model No. 20-0307650, and is connected to the tip of the arm, The connecting device is characterized in that the connecting device comprises a bracket having a fixing pin insertion hole fixed to the tip of the arm on an upper side thereof and a fixing groove and a guide portion for inserting a supporting pin of the attachment mechanism on the lower side, A pin locking member coupled to the hinge pin so as to be rotatable and selectively fixed to the support pin in the guide portion and a cylinder having a rod for pivoting the pin locking member to fix or release the support pin in the guide portion .

However, in such a conventional technique, when a driver of an excavator manipulates a pin lock member of a cylinder in a driver's seat to couple a working mechanism such as a bucket, and then locks the lock pin It is very troublesome and time-consuming to insert and separate the lock pin because the driver must come down from the excavator or a separate operator inserts the lock pin directly into the insertion hole and detaches it.

Therefore, in order to solve the above-mentioned problems, a heavy-duty attachment coupler has been proposed in Japanese Patent No. 10-1093218, but it has a coupler body coupled to an arm of a heavy equipment, a fixed body coupled to the coupler body, A moving hook which is rotatably coupled to the coupler body by a hinge shaft and is coupled to another coupling pin of the attachment, an inflow cylinder which rotates the engaging hook to engage or disengage the moving hook, A link member which is coupled to a tip end of the lock hook and is hinged to the hinge shaft on the other side of the body; And the hook is brought into contact with the outside of the hook, And locking and unlocking of the locking hook is performed by interlocking operation.

However, in such an apparatus, when the link member is supported by the hinge pin, the apparatus is in an inoperable state in which it can not operate in conjunction with the movement hook, and when the rotation hook is provided with the rotation body, the distance between the rotation body and the movement hook is short The size of the moving hook is increased more than necessary and the operation of the locking hook is not smooth. In addition, when an error is generated in the distance between the rotating body and the moving hook, malfunction or inoperability occurs.

In order to solve these problems, a safety lock device for a quick coupler filed by the present applicant with a patent application No. 10-2013-129935 has been proposed, which is in contact with the outer surface of a movable hook rotating according to the operation of the cylinder Side hitch is provided with an operation bar for releasing the locked state of the fixed-side hitch on the opposite side. The operation bar is configured to slide in the guide block fixed to the body plate, However, if the distance between the operation bar and the outer surface of the movable hook is not matched due to abrasion after assembly or after use, the operation is not smooth and causes a malfunction. In this case, And the need to rebuild the bar.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide a safety hook, And to provide a safety lock device for a quick coupler which can prevent the occurrence of an inability.

Another object of the present invention is to provide a safety lock device for a quick coupler which is easy to assemble and can be operated reliably to further enhance safety.

A safety lock device for a quick coupler according to the present invention comprises a fixed hook formed at one side of an inner side of a body plate for inserting one of engagement pins of a work mechanism and a fixed hook formed on an opposite side of the fixed hook, A movable hook which locks the other engagement pins of the work mechanism and a movable hook which interlocks with the operation of the movable hook at the opposite sides of the fixed hook and the movable hook to prevent the engagement state of the engagement pin of the work mechanism from being arbitrarily released, And a safety locking means provided with a fixed-side hitch, wherein the safety locking means comprises a safety locking means for locking the operation hook, which is engaged with the contact portion formed on the outer surface of the movable hook, And a link member is coupled to the other side of the fixed-side hitch so that its tip is connected to the tip of the movable-side hitch, Characterized in that the length of the adjusting screw shaft at a front end coupled to function.

In the case where the outer side of the movable hook does not fit with the length of the actuating bar during assembly, or the length of the end of the actuating bar is reduced due to abrasion or the like during use, Since the length can be adjusted, operation is smoothly performed by adjustment of the operation bar even during assembly or use, and reliable operation is performed. In case of abrasion, only the tip portion can be replaced without replacing the entire operation bar, And the safety is further increased.

1 is a partially exploded perspective view showing a safety lock device for a quick coupler according to the present invention,
FIG. 2 is a front view of the safety lock device for a quick coupler according to the present invention, in which the body plate is removed in FIG. 1,
Fig. 3 is a view showing a safety lock device for a quick coupler according to the present invention, which is a perspective view seen from a direction different from that of Fig. 1,
4 is a perspective exploded perspective view of the safety lock device for a quick coupler according to the present invention,
FIG. 5 is a cross-sectional view of a main portion of a safety lock device for a quick coupler according to the present invention,
6 is an exploded perspective view of a link member in a safety lock device for a quick coupler according to the present invention.

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

Fig. 1 is a partially exploded perspective view showing a safety lock device for a quick coupler according to the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a perspective view seen from a direction different from Fig. 1, A pair of body plates 11 and 12 are opposed to each other and a movable hook 14 which is pivoted according to the operation of the cylinder 13 is coupled to one side of the body plate 11 and a fixed hook 15 is provided on the other side. And the movable hook 14 is rotatably coupled to the movable hinge pin 16 on one side.

The engaging pins A1 and A2 of the working mechanism such as a bucket, a breaker and the like are positioned inside the movable hook 14 and the fixed hook 15 to maintain the engaged state.

On the other hand, a safety locking means 20 is provided inside the body plates 11 and 12 to prevent the locking state of the movable hook 14 and the fixing hook 15 from being arbitrarily released.

The safety lock means 20 includes a movable side hitch 21 coupled to the movable hinge pin 16 and rotating on the opposite side of the movable hook 14, And a side hitch (22).

The fixed side hitch 22 is rotatably coupled to a fixed hinge pin 23 coupled to one side of the fixed hook 15 in the transverse direction and the fixed side hitch 22 is urged by a spring 24 It is combined so that its tip is downward.

That is, the movable-side hitch 21 and the fixed-side hitch 22 are configured such that the engagement pins A1 and A2 of the work mechanism do not arbitrarily detach from the openings of the movable hook 14 and the fixed hook 15 .

One end of the operating bar 30 which rotates the fixed-side hitch 22 in conjunction with the movable hook 14 is coupled to one side of the fixed-side hitch 22 by a connecting pin 31.

The operation bar 30 is slidably engaged in a guide member 32 fixed to the inner surface of the body plate 12. [

4 and 5, one end of the length adjusting screw shaft 33 is coupled to the distal end of the operating bar 30, and the other end of the operating bar 30 is connected to an opening A cap nut 35 having a cap nut 35a is fastened to the cap nut 35 and a ball 36 is embedded in the cap nut 35. A portion of the ball 36 protrudes from the tip of the cap nut 35 Consists of.

The distal end of the operating bar 30 is configured to contact the contact portion 14a formed on the outer circumferential surface of the movable hook 14 to rotate the fixed-side hitch 22 by a turning operation.

Therefore, by adjusting the length of the length adjusting screw shaft 33 coupled to the operating bar 30, it is possible to adjust the position of the cap nut 35 and the ball 36 coupled to the front end thereof, It is possible to adjust the distance according to the operation of the vehicle.

On the other hand, a link member 40 connected to the fixed-side hitch 22 and the movable-side hitch 21 for interlocking operation is coupled to the opposite side of the operation bar 30.

6, the link member 40 includes connecting shafts 41 and 42 hinged to the movable side hitch 21 and the fixed side hitch 22, (43) and a fixing nut (44) which are coupled to the tip of the guide shaft (42).

Therefore, the length of the link member 40 can be adjusted by the connection nut 43 coupled to the connection shaft 41 (42).

In the safety lock device for a quick coupler according to the present invention, the fastening hook 15 is first inserted into the coupling pin A2 of the working mechanism in a state where the quick coupler 10 is mounted on the end of the arm of the excavator At this time, the movable hook 14 is retracted as shown by the one-dot chain line in Fig. 2, and the tip of the operating bar 30 contacts the contact portion 14a in accordance with the backward movement of the movable hook 14, The fixed side hitch 22 is in the open state, and it becomes possible to position the engaging pin A2 in the fixed hook 15. [

The movable side hitch 21 is also turned by the interlocking operation of the link member 40 coupled with the opening of the fixed side hitch 22 to be in an open state.

At this time, the driver of the excavator operates the quick coupler 10 to position the engagement pin A2 of the work mechanism in the proper position, then actuates the cylinder 13 to rotate the movable hook 14, Lt; / RTI >

At the same time, when the engaging pin A1 is engaged in the movable hook 14, the abutting portion 14a is spaced from the tip of the actuating bar 30, whereby the force applied to the actuating bar 30 is released, (22) is pivoted downward by the elastic force of the spring (24) to hold the engagement pin (A2) on the opposite side of the fixed hook (15) and to maintain the locked state.

When the fixed-side hitch 22 is lowered and locked, the link member 40 interlocked with the fixed-side hitch 22 is moved counterclockwise as shown in FIG. 2 to rotate the movable-side hitch 21, As shown in FIG.

Therefore, the engagement pins A1 and A2 of the working mechanism are engaged with the movable hook 14 and the fixed hook 15 by the operation of the safety lock means 20 so that the movable hitch 21 and the fixed hitch 15 The movable hitch 21 and the fixed hitch 22 are not disengaged arbitrarily even when a sudden impact or a breakage of the cylinder 13 is caused by the rotation of the movable hitches 22 and 22 so that the safety is further enhanced.

When the locked state of the safety lock means 20 is canceled, when the lock state of the movable hook 14 is released by operating the cylinder 13 backward, the movable side hitch 21 and the fixed side hitch 21, The lock state of the lock lever 22 is released.

That is, when the movable hook 14 is rotated in the counterclockwise direction as indicated by the dot-dash line in FIG. 2 in response to the backward movement of the cylinder 13, the engagement state of the engagement pin A1 is released, The contact portion 14a of the movable hook 14 comes into tight contact with the ball 36 at the tip end of the operating bar 30 and slides rightward in the figure so that the fixed side hitch 22 rotates counterclockwise The engagement state of the pin A1 is released, and at the same time, the linkage member 40 is interlocked and the movable side hitch 21 rotates clockwise to release the lock state.

The length of the actuating bar 30 is changed by abrasion of the ball 36 coupled to the tip of the actuating bar 30 during use and the dimensional error at the time of assembly and contact with the abutting portion 14a of the movable hook 14 It is possible to adjust the length by withdrawing or inserting the length adjusting screw shaft 33 from the operating bar 30 if it is not correct.

When the length of the link member 40 on the opposite side is to be adjusted according to the adjustment of the length of the operating bar 30, the connecting nut 43 and the fixing nut 43 interposed between the connecting shafts 41 and 42, It is possible to adjust the length thereof by adjusting the screw 44.

10: Quick coupler 11, 12: Body plate
13: cylinder 14: movable hook
15: fixed hook 20: safety locking means
21: movable side hitch 22: fixed side hitch
30: actuating bar 32: guide member
33: Length adjusting screw shaft 34: Position adjusting nut
35: Cap nut 35a:
36: ball 40: link member
41, 42: connecting shaft 43: connecting nut

Claims (4)

A movable hook formed on an inner side of the body plate for inserting one of the engaging pins of the working mechanism; a movable hook formed on the opposite side of the fixed hook and rotating according to the operation of the cylinder to lock the other engaging pins of the working mechanism; And a safety lock means provided on the opposite side of the fixed hook and the movable hook, the safety hitch including a movable side hitch and a fixed side hitch for interlocking with the operation of the movable hook to prevent the engagement state of the engagement pin of the work mechanism from being arbitrarily released A safety lock device for a quick coupler,
The safety lock means includes an operation bar 30 whose tip is in contact with a contact portion 14a formed on the outer side surface of the movable hook 14 and is slidably engaged with the tip of the fixed side hitch 22, 22 is coupled to a link member 40 whose tip is coupled to the tip of the movable hitch 21,
Wherein a length adjusting screw shaft (33) is coupled to a tip of the operating bar (30) so that the length of the operating bar (30) can be adjusted. The method according to claim 1,
Wherein a cap nut (35) having an opening (35a) at its tip is coupled through a ball (36) to the tip end of the length adjusting screw shaft (33). The method according to claim 1,
Wherein a position adjusting screw shaft (33) coupled to a front end of the operating bar (30) is positioned by a position adjusting nut (34). The method according to claim 1,
The link member 40 includes connecting shafts 41 and 42 hinged to the movable hitch 21 and the fixed hitch 22 and a connecting shaft 41 and 42 connected to the ends of the connecting shafts 41 and 42, A safety lock for a quick coupler comprising a nut (43).

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