JPS5815570B2 - Clamp type bucket mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp-type bucket attachment device that uses a pair of clamps to grasp and release excavated objects, construction materials, and the like.

FIG. 1 shows a hydraulic excavator, that is, an excavator A, equipped with a general excavating bucket.

In the figure, 7 is an arm, and 1' is an excavation bucket rotatably attached to the tip of the arm 7 with a pin 8. This excavation bucket 1' is connected to a piston rod 22 of a hydraulic cylinder 21 via a rod 23. One end of the lever 24 is connected to the connecting portion between the piston rod 22 and the rod 23 by a pin 25, and the other end of the lever 24 is rotatably connected to the arm 7 by a pin 26.

27 is a pin for connecting the rod 23 and the excavation bucket 1'.

When the hydraulic cylinder 21 is actuated, the excavating bucket 1' rotates around the pin 8.

For such an excavation bucket 1', a ramp type bucket 1 as shown in FIG. 2 has been proposed and put into practical use.

A pair of upper and lower clamps 2 and 3 are rotatably attached to a holder 4 that is fixed to the tip of an arm 7 with two pins 8 and 25 using pins 12 and 13, respectively, and both lamps 2 and 3 are connected by a link 16 attached with pins 14 and 15, and the tip of the piston rod 22 of the hydraulic cylinder 21 is connected to the lever 24', one end of which is rotatable by a pin 28 to the holder 4. 29, one end of which is connected to the upper clamp 2 by a pin 31, and the other end of which is connected by a pin 30. When the hydraulic cylinder 21 is actuated, the pair of clamps 2 and 3 move in opposite directions. Rotate to.

In this clamp type bucket 1, the excavation bucket 1
It is possible to perform movements to grasp objects that cannot be achieved with ``.

By the way, when attaching the clamp type bucket 1 to the excavator A in place of the excavating bucket 1', conventionally, the pins 8, 25, 26 shown in FIG. 1 are removed and the excavating bucket 1' is removed together with the lever 24 and rod 23. Then, as shown in FIG. 2, the holder 4 is fixed to the arm 7 with a pin 8.25, and the piston rod 22 is attached to the lever 24' of this clamp type bucket 1 with a pin 29.
However, in this case, it had the following drawbacks.

In other words, although the lever 24 and the rod 23 perform substantially the same operation both in the excavation bucket 1' and in the clamp type bucket 1, and can be used in common, the holder 4 is not connected to the arm 7. pin 8,
25, the clamp-type bucket 1 must be provided with a special lever 24' and rod 23', which increases the weight of the clamp-type bucket 1 and complicates attachment/detachment/replacement work. , and a pin 25 for attaching lever 24 to arm 7 by the manufacturer of excavator A.
Another problem is that the clamp-type bucket 1 cannot be used in common with excavators A of different manufacturers because the distance between the excavating bucket 1' and the pin 8 that attaches it to the arm 7 is different.

Furthermore, since a large load is applied to the pin 25, there is a risk that the arm 7 will be damaged at this portion.

The present invention has been made in view of the above points, and its main purpose is to provide a holder that must be fixedly attached to the arm of an excavator when a clamp-type bucket is attached to the arm of an excavator instead of an excavation bucket. A pair of abutments are provided on the holder, and only one pin is required to hold the arm between the two abutments.This allows adaptation to differences between manufacturers of excavators, and also makes it easier to use levers and rods for digging. The object of the present invention is to provide a clamp-type bucket mounting device that can be used in common with the bucket and therefore facilitates bucket replacement work.Another object of the invention is to provide a clamp-type bucket mounting device that can be used in common with the bucket, and that makes it easy to replace the bucket. Another object of the present invention is to provide a clamp-type bucket mounting device that can easily accommodate the difference in dimension between the upper and lower surfaces of an arm that a pair of abutting tools abut.

The present invention will be explained in detail below based on illustrated embodiments.

3 to 5 show an embodiment of the present invention, and this clamp type bucket 1 includes a holder 4 disposed on both sides of an arm 7, and a pin 12 at one end of the holder 4. A pair of upper and lower clamps 2 and 3 are rotatably connected by 13, a link 16 whose both ends are connected to the pair of upper and lower clamps 2°3 by pins 14 and 15, and a rod receiver 17 provided on the upper clamp 2. When attaching the excavating bucket 1 to the arm 7 of the excavator A in place of the excavating bucket 1', the excavating bucket 1 is attached to the pin 8°27.
By removing the arm 7, the lever 24 and the rod 23 are removed.

Then, the center portion of the holder 4 is attached to the bucket attachment hole of the arm 7 using the pin 8, and the rod receiver 17 is connected to the rod 23 using the pin 27.

In this state, the holder 4 is in a state where it can be rotated relative to the arm 7 by the pin 8.

Next, when the hydraulic cylinder 21 is actuated to project the piston rod 22, the holder 4 rotates about the pin 8, and the abutment 5 provided at the lower part of the other end of the holder 4 comes into contact with the lower surface of the arm 7.

After this, the abutment tool 6 that comes into contact with the upper surface of the arm 7 is installed on the upper part of the holder 4.

The holder 4 is fixedly attached to the arm 7 by holding the arm 7 between the pair of abutting tools 5 and 6 and by the pin 8.

Then, when the hydraulic cylinder 21 is operated in the opposite direction to retract the piston rod 22, the upper and lower pair of clamps 2 and 3, which had been closed until then, are rotated in opposite directions and the fourth
Both clamps 2 and 3 are opened as shown in the figure.

The reason why the lower clamp 3 is also made to move is because it is preferable for both clamps 2 and 3 to open quickly when loading something grabbed by both clamps 2 and 3 into a car or the like.

However, the pin 14 for connecting the link 16 and the upper clamp 2 is located closer to the tip of the clamp 2 than the pin 12 for connecting the upper clamp 2 and the holder 4, and the link 16 and the lower The pin 13 for connecting the clamp 3 and the holder 4, which is located below the pin 15 for connecting the clamp 3 and the holder 4, is located on the toe side of the clamp 3, and
In the state shown in FIG. 3 where the is closed in a substantially horizontal state,
The pins 14 and 15 are positioned lower than the pins 12 and 13, respectively, and when opening both clamps 2 and 3, the upper clamp 2
As the lower clamp 3 rotates upward, the lower clamp 3 rapidly rotates downward halfway, but after that the speed slows down.
When the toe of the lower clamp 3 reaches a horizontal position, the lower clamp 3 is almost stopped and only the upper clamp 2 is rotated further upward.

This is achieved by making it easier to scoop up the object to be grabbed by the lower clamp 3 and by increasing the opening angle of both clamps 2 and 3.

FIG. 6 shows the abutting tool 6 that is brought into contact with the upper surface of the arm 7 in the above embodiment, and has ribs 32, 32 protruding from both side edges, and both ends are placed on one end of the holder 4 located on both sides of the arm 7. A fixing piece 33 with reinforcing ribs 35 provided on the edge,
33 with a bolt 34 and abuts against the upper surface of the arm 7 via an elastic member 9 placed on the lower surface of the abutting tool 6.

FIG. 7 shows the abutment tool 5 that is brought into contact with the lower surface of the arm 7, and the rotating shaft 10 is inserted through the holder 4 and the abutment tool 5.
The abutment tool 5 is rotatable around an axis relative to the holder 4.

Also, an elastic material 9 is provided on the abutting surface of the abutment tool 5 against the lower surface of the arm 7.

The elastic members 9, 9 provided on each abutment 5.6 are for cushioning the impact applied to the arm 7.

Furthermore, since the lower abutment tool 5 is rotatable relative to the holder 4, the best abutment against the arm 7 can always be obtained even if the dimensions between the upper and lower surfaces of the arm 7 and the position of the pin 8 are different. It is something.

Reference numeral 36 designates a stopper which restricts the rotation range of the abutment tool 5 and is attached to the arm 7 to prevent the abutment tool 5 from turning too much.

Other embodiments are shown in FIG. 8 and below.

This is because the upper abutting tool 6 is rotatable with respect to the holder 4 in the same manner as the lower abutting tool 5 in the embodiment described above, to improve contact with the arm 7. By making arm 7
The boss 18 is fixed to the holder 4 to accommodate the dimensional difference between the upper and lower surfaces of the holder 4.
The eccentric boss 19 having a diameter is rotatably attached to the boss 18, and the abutment tool 6 is rotatably attached to the rotating shaft 10 inserted into the shaft hole 37.

When the eccentric boss 19 is rotated, the position of the rotating shaft 10 changes, so the flange portion of the eccentric boss 19 is rotated to the boss 1 at a position where the elastic material 9 attached to the lower surface of the abutment tool 6 abuts the upper surface of the arm 7.
8 with a plurality of bolts 38.

Incidentally, the elastic material 9 may be provided not only on the abutting tool 5.degree.6 but also on the inner surface of the holder 4 facing the side surface of the arm 7.

As described above, in the present invention, the holder is provided with a pair of abutting tools that come into contact with the upper and lower surfaces of the arm to sandwich the arm, so the pins necessary to attach the holder to the arm are used to connect the excavation bucket to the arm. All you need to do is use a pin to attach it to the excavation bucket, and therefore the lever and rod can be the same as the excavation bucket.This also makes it easy to attach and detach the excavation bucket. Since the holder is attached to the abutment, it can be installed without wobbling, regardless of dimensional differences between excavator manufacturers, and the position and contact area of the abutment that contacts the underside of the arm can be freely adjusted. Since the arm can be removed, damage to the arm due to the load applied to the arm can be prevented.

[Brief explanation of the drawing]

Figure 1 is a front view of an excavator equipped with an excavation bucket, Figure 2
The figure is a front view of a conventional example, Figures 3 and 4 are front views of an embodiment of the present invention, Figure 5 is a plan view of the same, and Figures 6 a and b are enlarged front views and sectional views of the abutment tool , FIGS. 7a and 7b are vertical and cross-sectional views of the other abutment tool, FIGS. 8 and 9 are front views of other embodiments, and FIGS. 10a, b, and C are the same abutment tools as above. 1 is a clamp type bucket, 2.3 is a clamp, 4 is a holder, 5°6 is a stopper, 7 is an arm, 8 is a pin, 9 is an elastic material, and FIG. 10 indicates a rotation axis.

Claims (1)

[Claims] 1. A holder fixed to the tip of an arm of an excavator, and a pair of clamps attached to the holder, at least one of which is connected to an opening/closing power such as a hydraulic cylinder so that the clamp can be opened and closed. This clamp-type bucket is characterized in that the holder is fixed to the bucket attachment hole at the tip of the arm with a pin, and the arm is held between a pair of butts provided on the holder that abut the upper and lower surfaces of the arm. Clamp type bucket mounting device. 2. Claim 1, characterized in that a rotating shaft is attached to the holder and a stopper is rotatably provided on the rotating shaft.
Clamp-type bucket mounting device as described in section. 3. The clamp-type bucket attachment device according to claim 1 or 2, characterized in that an elastic material is interposed between the abutting tool and the arm. 4. The clamp-type bucket mounting device according to claim 2, wherein the rotating shaft is an eccentric rotating shaft.