JP2000319943A - Lock device of excavating claw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix an excavating claw to an adapter by preventing the occurrence of looseness between the adapter and the excavating claw. SOLUTION: A lock pin 11 is inserted over a through hole 5 bored in an adapter 2 fixed to the excavator body 1 side and a through hole 9 bored in an excavating claw 6 installed on the adapter 2, and the excavating claw 6 is fixed to the adapter 2. In this lock device of the excavating claw, a part of at least one through hole of the excavating claw 6 or the adapter 2 is plastically deformed so that a deformed place is brought into pressure contact with the lock pin 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating claw lock device for fixing an excavating claw used in a civil engineering construction machine to an excavator body such as an excavating bucket.

[0002]

2. Description of the Related Art Excavators used in civil engineering and construction equipment include:
There is an excavator such as an excavating bucket in which an excavating claw is detachably fixed to a tip of an excavating body so that the excavating claw can be replaced when the excavating claw is worn.

FIG. 9 is a plan view showing a front portion of an excavator bucket 1 as an example of an excavator body.
An adapter 2 is fixed to the front edge of the excavator 1 by welding at an interval, and the distal end of the adapter 2 is a projection 3 projecting forward from the front edge of the excavating bucket 1. The upper surface, the lower surface, and both side surfaces are provided with a taper 4 in a direction tapering toward the tip of the projection 3, and a portion near the base of the projection 3 is provided with a laterally extending adapter through hole 5.
Are drilled.

Reference numeral 6 denotes an excavating claw fixed to the adapter 2. A recess 7 is provided at the rear of the excavating claw 6 so as to be fitted with the projection 3 of the adapter 2 described above. Is provided with a taper 8 adapted to the taper 4 of the projection 3, and excavation claw through holes 9, 9 are formed in both side walls of the recess 7. The excavation claw 6 is attached to the projection 3 of the adapter 2.
When the concave portion 7 is deeply fitted, the adapter through-hole 5 and the excavation claw through-holes 9, 9 are arranged in a straight line in the horizontal direction.

When fixing the excavating claw 6 to the adapter 2,
A ring-shaped spring 10 is fitted in advance in a recess formed near the end of the adapter through-hole 5, and the concave portion 7 of the excavation claw 6 is fitted into the projection 3 of the adapter 2, and the tapered portions 4, 8 are joined together. When the recess 7 of the excavation claw 6 is fitted into the projection 3 of the adapter 2 while contacting the
And the excavation claw through holes 9, 9 are aligned on a straight line in the horizontal direction.

In this state, when the lock pin 11 is pushed into the excavation claw through hole 9 from one side surface of the excavation claw 6, the tip of the lock pin 11 has a ring-shaped spring 10 contracted to a smaller diameter than the adapter through hole 5. Is inserted into the adapter through hole 5 while spreading, and further penetrates through the excavation claw through hole 9 on the other side of the excavation claw 6, and the excavation claw 6
1 and is fixed to the adapter 2.

[0007]

Since the outer diameter of the lock pin 11 must be made slightly smaller than the inner diameter of the adapter through-hole 5 and the excavation claw through-hole 9, the distance between the adapter 2 and the excavation claw 6 must be reduced. Generally causes backlash.

SUMMARY OF THE INVENTION An object of the present invention is to provide a locking device for a drilling claw which can firmly fix the drilling claw to the adapter without rattling between the adapter and the drilling claw.

[0009]

According to the first aspect of the present invention, a through hole formed in an adapter fixed to an excavator body side;
In a locking device for a drilling claw for inserting a lock pin through a through hole formed in a drilling claw attached to the adapter and fixing the drilling claw to the adapter, at least one of the drilling claw or the adapter has a through hole. Plastically deform a portion of the excavation claw lock device, characterized in that the deformed portion is pressed against the lock pin,
By pressing the deformed portion of the through hole against the lock pin, play is eliminated between the excavation claw and the adapter and the lock pin, and the excavation claw is firmly fixed to the adapter.

[0010] According to a second aspect of the present invention, a lock pin is inserted through a through hole formed in an adapter fixed to the excavator body and a through hole formed in a drill claw attached to the adapter. In the excavating claw locking device for fixing the excavating claw to an adapter, a projecting portion is formed in a part of at least one of the through holes of the excavating claw or the adapter, and the projecting portion is pressed against the lock pin. The present invention relates to a locking device for a drilling claw, in which a protrusion of a through hole presses against a lock pin, thereby eliminating play between the drilling claw and the adapter and the lock pin, and the drilling claw is firmly fixed to the adapter. Become like

According to a third aspect of the present invention, a lock pin is inserted through a through hole formed in an adapter fixed to the excavator body and a through hole formed in a drill claw attached to the adapter. In the locking device for a drilling claw that fixes the drilling claw to an adapter, a projection is formed in a part of a through hole formed in the drilling claw, and an annular recess is provided on an inner periphery near one end of the through hole. A tapered portion is formed at the tip of the lock pin, an annular recess is provided on the outer periphery of the lock pin, and a ring-shaped spring fitted in the annular recess on the inner periphery of the through hole is fitted into the annular recess on the outer periphery of the lock pin. The present invention relates to an excavating claw locking device characterized in that a tapered tapered portion is formed at the tip of the lock pin, so that a drilling hole is formed in the adapter and a drilling claw is formed in the excavating claw. Through holes It is easy to insert the lock pin over the ring pin, and the ring-shaped spring is fitted into the annular recess of the lock pin by fitting the ring-shaped spring into the annular recess of the through hole formed in the excavation claw. In this case, the protruding portion and the ring-shaped spring are pressed against the lock pin, so that the lock pin is prevented from falling off, and the excavation claw is securely fixed to the adapter.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a side view showing an example of the embodiment of the excavation claw 6 of the present invention, and FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. Signs are attached. In the excavation claw 6 of the present invention shown in FIGS. 3 and 4, a part of the excavation claw through holes 9, 9 formed on both side walls of the recess 7 is deformed, and The protruding part 12 is formed in a close place.

The protruding portion 12 can be formed by partially removing a core used when casting the excavation claw 6, or by welding and welding after the excavation claw 6 is cast. When the diameter of the excavation claw through-hole 9 is 20 mm, the protrusion 12 has a height of 3 mm and a root thickness of 1.
It has a shape of 5 mm gradually thinner toward the tip, and is formed so as to protrude over approximately one-half to two-thirds of the inner circumference of the excavation claw through hole 9. The protruding portions 12 may not be formed in the excavation claw through holes 9 on both side walls of the recess 7 but may be formed only in one excavation claw through hole 9.

FIG. 5 is a side view showing an example of the embodiment of the adapter 2 of the present invention. FIG. 6 is a sectional view taken along the line VI-VI of FIG. Are denoted by the same reference numerals. In the adapter 2 of the present invention shown in FIGS. 5 and 6, a part of the adapter through-hole 5 formed in the projection 3 is deformed to form the projection 13 at a position near both ends of the adapter through-hole 5. are doing.

The projecting portion 13 can also be formed by partially cutting or welding the core. When the diameter of the adapter through hole 5 is 20 mm, the projecting portion 13 has a height of 3 mm, It has a root thickness of 1.5 mm and gradually becomes thinner toward the tip, and is formed so as to protrude over approximately one-half to two-thirds of the inner periphery of the adapter through hole 5. . The protrusions 13 may be formed only at one end of the adapter through-hole 5 without being formed at both ends of the adapter through-hole 5.

FIG. 2 is a sectional view of the excavating claw 6 shown in FIGS.
5 is a side view showing a state of being fixed to the adapter 2 shown in FIGS. 5 and 6. FIG. 1 is a sectional view taken along line II of FIG. The outer diameter is slightly smaller than the inner diameter of the drilling claw through hole 9 and
The lock pin 11 having a higher hardness than the material No. 3 is used. Then, the concave portion 7 of the excavation claw 6 is fitted deeply into the projection 3 of the adapter 2, and the lock pin 11 is driven into the excavation claw through hole 9 from one side of the excavation claw 6. , 13 penetrate to a predetermined position while causing plastic deformation at a part of the tip.

As described above, the adapter 2 and the excavation claw 6 fixed via the lock pin 11 are deformed by the protrusions 12 and 13 being pressed against the lock pin 11 as shown in FIG. Therefore, there is no backlash between the adapter 2 and the excavation claw 6 and the firmly fixed state is maintained.

In the above-described embodiment, the shapes of the adapter through-hole 5 and the excavating claw through-hole 9 and the lock pin 11 are circular in cross section.
These shapes may be elliptical or polygonal. Further, only one of the protruding portions 12 and 13 may be provided, and the lock pin 11 may be an excavating claw that is inserted vertically. .

Next, FIG. 7 is a sectional view of a portion similar to FIG. 4 of another embodiment of the excavation claw 6 of the present invention,
An annular recess 15 for fitting a ring-shaped spring to be described later is provided on the inner periphery on the inner end side of the excavation claw through hole 14 formed in the upper side wall in FIG. Also, the drilling claw through hole 16 formed in the lower side wall of the recess 7 in FIG. 7 has a diameter slightly larger than the diameter of the drilling claw through hole 14 formed in the upper side. A burr-like projection 12 is formed in a part of both excavation claw through holes 14 and 16.

FIG. 8 is a cross-sectional view similar to FIG. 1 showing a state in which the excavating claw 6 of FIG. 7 is fixed to the adapter 2, and an upper end of the lock pin 11 used in this case in FIG. A tapered portion 17 is formed at the end on the side, and an annular concave portion 18 having an arc-shaped cross section is provided on the outer periphery of the lock pin 11 close to the tapered portion 17. The lower end side of the lock pin 11 in FIG. 8 is formed with a head 19 that can be fitted into the excavation claw through hole 16 having a large size.

When the excavating claw 6 of FIG. 7 is fixed to the adapter 2 as shown in FIG. 8, a ring-shaped spring 20 is fitted in advance in the annular concave portion 15 of the excavating claw 6, and Is fitted deeply into the projection 3 of the adapter 2, the ring-shaped spring 20 is sandwiched between the annular recess 15 and the projection 3, and does not fall off from the annular recess 15. Subsequently, the tip of the lock pin 11 is fitted into the excavation claw through hole 16.
Since the diameter of the lock pin 11 is slightly larger than the diameter of the lock pin 11 and the tapered tapered portion 17 is formed at the tip of the lock pin 11, the tip of the lock pin 11 can be fitted into the excavation claw through hole 16 very easily. You can do it.

After the tip of the lock pin 11 is fitted into the drill claw through hole 16 and the head 19 of the lock pin 11 is hit with a hammer or the like, the tip of the lock pin 11 is inserted into the protrusion 12 on the drill claw through hole 16 side. While causing plastic deformation, it enters into the through-hole 5 of the adapter 2, further expands the ring-shaped spring 20 and enters into the through-hole 14, and the through-hole 1
The projecting portion 12 on the fourth side is plastically deformed and fits deeply into the excavating claw through hole 14 as shown in FIG. 8, and the head 19 of the lock pin 11 abuts on the peripheral edge of the end of the through hole 5 of the adapter 2. . At this time, the annular concave portion 18 of the lock pin 11 reaches the position of the ring-shaped spring 20, and the ring-shaped spring 20 is fitted into the annular concave portion 18 by its elastic force.

As a result, the lock pin 11 is firmly fixed by the holding by the ring-shaped spring 20 and the pressing of the protruding portion 12, so that there is no play between the adapter 2 and the excavation claw 6, and the lock pin 11 does not come off. Will be held.

[0024]

According to the first aspect of the present invention, a part of at least one of the through hole of the excavation claw or the adapter is deformed and the deformed portion is pressed against the lock pin, so that the excavation claw, the adapter and the lock pin are connected to each other. There is no backlash between them, and there is an effect that the excavation claw is firmly fixed to the adapter.

According to a second aspect of the present invention, a projecting portion is formed in at least a part of the through hole of the excavating claw or the adapter, and the protruding portion is pressed against the lock pin so that the excavating claw or the adapter and the lock pin are connected to each other. There is no play in the middle, and there is an effect that the excavation claw is firmly fixed to the adapter.

According to the third aspect of the present invention, since the tapered portion is formed at the tip of the lock pin, the lock pin extends over the through hole formed in the adapter and the through hole formed in the excavation claw. The ring-shaped spring is fitted in the annular concave portion of the through-hole formed in the excavation claw, so that the ring-shaped spring fits in the annular concave portion of the lock pin, and the lock is locked. When the protruding portion and the ring-shaped spring are pressed against the pin, the lock pin is prevented from falling off, and there is an effect that the fixing of the excavation claw to the adapter is ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG.

FIG. 2 is a side view showing an example of the embodiment of the present invention.

FIG. 3 is a side view showing an example of the embodiment of the excavation claw of the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a side view showing an example of the embodiment of the adapter of the present invention.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a cross-sectional view of a portion similar to FIG. 4 of another example of the embodiment of the excavation claw of the present invention.

FIG. 8 is a sectional view similar to FIG. 1 of another example of the embodiment of the present invention.

FIG. 9 is a plan view showing an example of a front portion of a digging bucket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator main body (digging bucket) 2 Adapter 5 Through hole (adapter through hole) 6 Drilling claw 9 Through hole (digging claw through hole) 11 Lock pin 12, 13 Projection part 14, 16 Through hole (digging claw through hole) 15 annular recess 17 tapered portion 18 annular recess 20 ring-shaped spring

Claims (3)

[Claims] 1. A lock pin is inserted through a through hole formed in an adapter fixed to an excavator body and a through hole formed in a drill claw attached to the adapter. In the lock device of the excavation claw that fixes the to the adapter, at least one of the through hole of the excavation claw or the adapter is plastically deformed, and the deformed portion is pressed against the lock pin and stopped. Drilling claw locking device. 2. A lock pin is inserted through a through hole formed in an adapter fixed to the excavator body and a through hole formed in a drill claw attached to the adapter, and A locking device for fixing an excavating claw to an adapter, wherein a protruding portion is formed in at least one of the through holes of the excavating claw or the adapter, and the protruding portion is pressed against the lock pin. Locking device. 3. A lock pin is inserted through a through-hole formed in an adapter fixed to an excavator body and a through-hole formed in a drill claw attached to the adapter, and the drill claw is provided. The excavating claw locking device for fixing the locking pin to the adapter, a protruding portion is formed in a part of a through hole formed in the excavating claw, and an annular concave portion is provided on an inner periphery near one end of the through hole, and a tip of the lock pin is provided. The lock pin is formed with a tapered portion, and an annular recess is provided on the outer periphery of the lock pin, so that a ring-shaped spring fitted in the annular recess on the inner periphery of the through hole can be fitted into the annular recess on the outer periphery of the lock pin. A locking device for a drilling claw, characterized in that: