JPH0630910Y2 - Claw member for drilling attachment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pawl member attached to an excavation attachment of an earthworking machine such as an excavation bucket. The present invention relates to improvement of an anti-wear structure when used in a vertically oriented state.

[Conventional technology]

Generally, a claw member used for an earthwork excavation attachment such as an excavation bucket is composed of an adapter fixed to the excavation attachment side by welding or the like, and a claw body detachably attached to the adapter, and a pin or the like. The connecting means prevents the nail body from coming off the adapter.

11 and 12 show a claw main body of a conventional claw member of this type of excavation attachment, and the claw main body 100 has a flat blade claw 101 at its tip. Has a wedge shape that gradually becomes thinner toward the tip.

[Problems to be solved by the device]

In the conventional excavation attachment claw member, when the claw body 100 is used in a vertically placed state with the plate surface of the claw 101 oriented in the horizontal direction, the wall thickness of the claw 101 gradually increases toward the base end. As shown in FIG. 13, only the tip of the lower end of the claw 101 is worn and the cutting edge becomes round in a short period of time.
There is a problem that work efficiency is lowered and it takes time to process and replace.

The present invention has been made in view of the current situation, and an object thereof is to provide a claw member for an excavation attachment that can prevent the cutting edge from being rounded due to wear.

[Means for Solving the Problems]

As a means for achieving the above-mentioned object, the present invention provides a claw member of an excavation attachment which can be used in a vertical position with the plate surface of the claw facing in the horizontal direction, and a lower end of the claw when the claw body is used in the vertical position. It is characterized in that at least a part of the edge is provided with a cut portion that is thinner than the thickness of the other portion of the nail at the same position in the front-rear direction.

Further, in the present invention, it is preferable that the cutting portion is provided on another portion while leaving the tip portion of the nail with a predetermined size left. Further, the cutting portion is used when the nail body is used in a vertically placed state. Provided on the upper and lower edges of each, and the nail body,
More preferably, the nails are turned upside down so that they can be used.

[Action]

In the claw member of the excavation attachment according to the present invention,
A cut portion is provided on at least a part of the lower end edge of the nail when the nail body is used in a vertically placed state, and the cut portion is formed to be thinner than the other portions at the same position in the front-rear direction of the nail. ing. Therefore, when excavating the ground with high resistance such as rock or clay using this nail body, the tip edge of the nail is worn and at the same time the thin cut bottom edge is worn in good balance, and the entire effective excavation edge is Wears straight.
There is no problem that only the tip of the lower end of the claw is worn and the cutting edge becomes rounded in a short period of time.

Further, in the claw member of the excavation attachment according to the present invention, the cutting portion is provided in the other portion while leaving the tip end portion of the claw a predetermined size, so that the blade portion originally thin in thickness is further provided with the cutting portion. It is possible to prevent a problem that the nail becomes thin and the strength of the nail decreases.

Furthermore, in the claw member of the excavation attachment according to the present invention, the cut portion is provided on each of the upper and lower edges of the claw when the claw body is used in a vertically installed state, and the claw body is used with the claw upside down. By making it possible, if the cut portion at the lower edge of the nail becomes round due to wear, the nail can be used upside down.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

FIG. 1 shows an example of a claw member for an excavation attachment according to the present invention. In the figure, reference numeral 1 is an adapter for attaching a claw to an earthworking attachment A such as a excavation bucket by means such as welding. The claw main body 2 is detachably attached to the tip of the adapter 1, and is fixed to the adapter 1 by a stopper 3.

As shown in FIGS. 1 to 3, a female fitting hole portion 5 into which a fitting projection portion 4 of an adapter 1 described later is fitted is formed in the base end portion of the claw body 2. Also the nail body 2
As shown in FIG. 4 and FIG.
Are integrally formed.

As shown in FIGS. 4 and 5, the claw 6 has a flat blade shape such as a roughly flat chisel whose wall thickness gradually decreases from the base end to the tip, and the claw body 2 is As shown in FIG. 1, the claws 6 are normally used in a vertically placed state with the plate surface of the claws 6 oriented in the horizontal direction.

As shown in FIGS. 4 and 5, at the upper and lower end edges of the claw 6 when the claw body 2 is used in a vertical position, that is, at the upper and lower end edges of the claw 6, as shown in FIGS. The dimension L
Only the cut portions 7 are provided so that the rear edges thereof are gradually cut off deeply. Each of these cut portions 7 is provided on the fourth side of the claw 6 as shown in FIGS. 5 and 6.
Cut both upper and lower edges in the figure from both sides in the thickness direction,
The claw 6 is formed so as to have a smaller wall thickness than the other parts of the claw 6 at the same position in the front-rear direction, thereby preventing only the blade tip part of the claw 6 from being worn and rounded. . This will be described in detail later.

As shown in FIGS. 2 and 3, a pair of locking portions composed of a distal side locking portion 8 and a proximal side locking portion 9 are provided on the inner peripheral portion of the fitting hole portion 5 on the opening end side. Is formed, and these both locking portions 8,
Between 9 is a ring groove 1 for accommodating a fastener 3 described later.
0 is provided.

As shown in FIG. 2 to FIG. 4, the distal end side locking portion 8 has an arc-shaped convex portion 8a protruding toward the inner diameter side and an arc-shaped concave portion 8b curved toward the outer diameter side in the circumferential direction. Alternately, for example, 8 pieces are arranged alternately to form a concavo-convex ring shape, and the base end side locking portion 9 has a substantially trapezoidal convex portion 9a protruding to the inner diameter side and an arc shape curved to the outer diameter side. The concave portions 9b and the concave portions 9b are alternately arranged in the circumferential direction, for example, eight concave concave portions 9b are formed in a concavo-convex ring shape. The convex portions 8a, 8a and the concave portions 8b, 9b of the two locking portions 8, 9 are arranged such that their circumferential positions are completely aligned (overlapped), as shown in FIG.

Further, as shown in FIGS. 2 and 3, the distal end side locking portion 8 is formed to be slightly smaller than the proximal end side locking portion 9. That is, the tip-side locking portion 8 has a smaller dimension than both the top dimension of the convex portion 8a and the lower bottom portion of the concave portion 8b, and the top dimension of the convex portion 9a of the proximal end-side locking portion 9 and the lower bottom dimension of the concave portion 9b. Is set so that it does not hinder the attachment of the nail body 2 to the adapter 1 as will be described later.

As shown in FIGS. 2 to 5, the ring groove 10 is provided with fastener operating holes 12 at, for example, two locations in the circumferential direction, and the fastener 3 installed between the adapter 1 and the claw body 2. Can be rotated from the outside of the claw body 2 by using a jig such as a lever.

On the other hand, as shown in FIGS. 7 and 8, a male fitting protrusion 4 which is fitted into the fitting hole 5 of the claw body 2 is formed at the tip of the adapter 1. A front side engaging portion 12 and a rear side engaging portion 13 respectively corresponding to the engaging portions 8 and 9 are provided on the outer peripheral portion of the base end of the fitting protrusion portion 4, respectively. , 13, a ring-shaped groove 14 is formed.

As shown in FIG. 7 and FIG. 8, the engaging portions 12 and 13 have arcuate convex portions 12a and 13a protruding toward the outer diameter side.
And the arcuate concave portions 12b and 13b curved toward the center side,
The protrusions 12a and the recesses 12b of the front side engaging part 12 and the protrusions 13a and the recesses 1 of the rear side engaging part 13 are formed in a concavo-convex ring shape in which, for example, eight concavities and convexes are alternately arranged in the circumferential direction.
3b, as shown in FIG. 8, the positions in the circumferential direction completely match (overlap) with each other, and the claw body 2
Is attached to the adapter 1 at the proper axial position, the convex portions 12a and 13a of the engaging portions 12 and 13 are coded into the concave portions 8b and 9b of the engaging portions 8 and 9, respectively. Joint part 1
The concave portions 12b and 13b of the reference numerals 2 and 13 correspond to the convex portions 8a and 9a of the locking portions 8 and 9, respectively. As a result, when the pawl body 2 is mounted on the adapter 1 as shown in FIG. 1, the front end engaging portion 12 engages with the front end side engaging portion 8 and the rear engaging portion 13 engages with the base end side. The locking portions 9 are engaged with each other so that the pawl body 2 is positioned around the shaft.

Further, as shown in FIG. 7 and FIG. 8, the front side engaging portion 12 is slightly smaller than the rear side engaging portion 13 in correspondence with the size difference of the locking portions 8 and 9. When the base end side engaging portion 9 passes through the position of the front side engaging portion 12 and is engaged with the rear side engaging portion 13, the base end side engaging portion 9 is formed.
And the front side engaging portion 12 do not interfere with each other.

Further, the groove 1 formed between these engaging portions 12 and 13
As shown in FIGS. 7 and 8, 4 has a circular bottom having a diameter of the concave portions 12b and 13 of the engaging portions 12 and 13, respectively.
It is formed to have a diameter smaller than the diameter of a circle inscribed in the lower bottom portion of b, and at one position in the circumferential direction of the bottom portion of this groove 14, it projects to the outer diameter side and regulates the rotation range of the stopper 3 described later. A stopper 14a is provided.

On the other hand, as shown in FIGS. 1 and 9, the fastener 3 has, for example, seven protrusions 15 having an arc shape on the outer peripheral edge.
a, 15b, 15c, 15d, 15e, 15f, 15g
And, for example, six concave portions 16a, 16b, 16c, 16
It is formed in a substantially inverted U-shaped plate shape in which d, 16e, and 16f are alternately arranged, and the size thereof is formed to be smaller than that of the rear side engaging portion 13 in a subtotal.

When the hook body 2 is attached to the adapter 1, the fastener 3 has protrusions 15a, 15b, 15c, 15d,
The circumferential positions of 15e, 15f, and 15g match (overlap) with the convex portions 12a and 13a of the engaging portions 12 and 13, respectively.
With the recesses 16a, 16b, 16c, 16d, 16
e and 16f are mounted in the groove 14 in such a manner that the circumferential positions thereof coincide with the recesses 12b and 13b of the engaging portions 12 and 13, respectively. Outlets 15a, 15b, 15c, 15d, 15e, 15
The circumferential positions of f and 15g match (overlap) with the convex portions 8a and 9a of both the locking portions 8 and 9, and each concave portion 1
The positions of 6a, 16b, 16c, 16d, 16e, 16f in the circumferential direction are rotated about the axis until the positions match (overlap) with the recesses 8b, 9b of the locking portions 8, 9. . As a result, the claw body 2 is prevented from coming off the adapter 1.

Next, the operation of this embodiment will be described.

When mounting the claw body 2 on the adapter 1, first, the end portion on the side of the protruding portion 15a is brought into contact with the stopper 14a in the groove 14 between the engaging portions 12 and 13 of the adapter 1 as shown in FIG. Attach the stopper 3 in the closed state. In this state, the concavo-convex shape of the stopper 3 and the concavo-convex shape of both the engaging portions 12 and 13 are completely the same.

Next, as shown in FIG. 1, with the plate surface of the claw 6 oriented in the horizontal direction, the claw body 2 is mounted on the adapter 1, and the fitting projection 4 and the fitting hole 5 are fitted together. Let And then
The stopper 3 is rotated through the stopper operating hole 11 to bring the end portion on the side of the protruding portion 15g shown in FIG. 9 into contact with the stopper 14a. As a result, the concavo-convex shape of the stopper metal 3 matches the concavo-convex shape of both the locking portions 8 and 9 of the claw main body 2, and the claw main body 2 is prevented from coming off from the adapter 1.

By the way, when the ground having a high resistance such as rock or clay is excavated by using the pawl main body 2 in the vertical state, the lower end of the tip of the pawl 6 is worn as shown in FIG. The amount of wear is large in many parts with a small wall thickness, and decreases as the wall thickness gradually increases. In the conventional case, as shown in FIG. 11 and FIG. 12, only the tip portion has the thin wall thickness, so that the wear concentrates only on the tip as shown in FIG. 13, and the cutting edge becomes round in a short period of time. turn into. On the contrary,
In the case of this embodiment, not only the distal end portion but also the proximal end side by the cut portion 7 is thin, so the claw 6
The lower edge of the will wear out as a whole. Therefore, as shown in FIG. 10, even if abrasion occurs, the cutting edge will not be rounded. That is, the wear of the lower edge acts to make the wear line of the entire claw almost straight, and the strength of the claw does not become insufficient due to the wear of this part.

In the claw 6 according to the present embodiment, the cut portion 7 is not provided from the tip of the claw 6, but is provided from a position closer to the base end side by the dimension L from the tip of the claw 6, for the following reason. .

That is, the tip portion of the claw 6 is a portion to which the greatest impact is applied during excavation, and is originally a thin portion (without the cut portion 7). Therefore, when the cutting portion 7 is provided from the tip of the claw 6, the thickness of the tip of the claw 6 becomes thinner, the resistance to impact of the cutting edge decreases, or the amount of wear of the cutting edge becomes extremely large. This is because the cutting edge may be rounded as a result.

When the lower end side of the claw 6 becomes rounded due to long-term use, the claw main body 2 is turned upside down and attached to the adapter 1 and used as described above. At this time, the cut portion 7 is formed by the nail body 2
The same effect can be obtained because they are provided at both upper and lower edges when the is used in a vertically placed state.

In the above-described embodiment, the case where the cut portions 7 are provided at the upper and lower end edges of the claw 6 on the assumption that the mounting position of the claw body 2 around the shaft of the adapter 1 can be changed has been described. Some adapters have only one mounting position. In this case, the cutting portion 7 has the nail 6
It suffices to provide it only on the lower edge of the claw 6, and it is not necessary to provide it on the upper edge of the claw 6. In the embodiment, the claw member that is attached to and detached from the attachment via the adapter has been described, but the present invention also includes a claw member that is welded to the attachment.

[Effect of device]

As described above, according to the present invention, when the nail main body is used in a vertically placed state, at least a part of the lower edge of the nail is provided with a cut portion which is thinner than the other portions at the same position in the front-rear direction. As a result, the wear of the claws due to excavation does not concentrate only on the tip portions of the claws, but occurs over a wide range of the lower edge of the claws. Therefore, the blade edge is less likely to be rounded even after long-term use, and the blade can be maintained in a state close to the initial state.

At this time, the cutting portion can be more effectively prevented from being rounded by providing the cutting portion at another portion while leaving the tip portion of the claw a predetermined size, and at the same time, the cutting edge resistance due to the provision of the cutting portion can be improved. It is possible to suppress the deterioration of impact resistance.

In addition, the cut parts are provided on the upper and lower edges of the claw when the claw body is used vertically, and the claw body can be used by turning the claw upside down. Can be doubled.

[Brief description of drawings]

1 is a sectional view showing a claw member of an excavation attachment according to an embodiment of the present invention, FIG. 2 is a sectional view of a claw body, FIG. 3 is a right side view of FIG. 2, and FIG. 4 is a claw body. Of FIG. 5, FIG. 5 is a similar perspective view, FIG. 6 is a sectional view taken along line VI-VI of FIG. 4, FIG. 7 is a sectional view of the adapter, and FIG. 8 is a left side view of FIG.
FIG. 9 is a block diagram of the stopper viewed from the left side of FIG.
FIG. 0 is an explanatory view showing a worn state of the tip of the claw, FIG. 11 is a view corresponding to FIG. 4 showing a structure of a conventional claw main body, FIG. 12 is a similar view corresponding to FIG. 5, and FIG. It is explanatory drawing which shows the state of abrasion of the nail | claw tip in a nail | claw main body. 1 ... Adapter, 2 ... Claw body, 3 ... Stopper, 6 ...
… Claws, 7… Cuts, L… Dimensions.

Claims (3)

[Scope of utility model registration request] 1. A claw member for an excavation attachment that can be used in a vertically placed state with the plate surface of the claw facing in the horizontal direction, at least a part of a lower edge of the claw when the claw body is used in the vertically placed state. A claw member for an excavation attachment, wherein a claw portion having a thickness smaller than that of another portion of the claw at the same position in the front-rear direction is provided. 2. The claw member for an excavation attachment according to claim 1, wherein the cutting part is provided behind the claw, leaving the tip part of the claw a predetermined size. 3. The cut portion is provided at each of the upper and lower edges of the nail when the nail body is used in a vertically placed state, and the nail body can be used by turning the nail upside down. The claw member of the excavation attachment according to claim 1 or 2.