JP7711034B2 - Jaw and jaw assembly having jaw - Google Patents

Description

The present disclosure relates to the field of demolition tools for crushing and/or cutting material, and in particular to jaws with replacement parts for such demolition tools and jaw assemblies with jaws.

A prior art demolition tool for crushing and/or cutting material (also simply referred to as objects) is disclosed in US Pat. No. 5,399,633. The demolition tool disclosed in US Pat. No. 5,399,633 includes a jaw assembly having a lower jaw and an upper jaw. The upper and lower jaws are pivotally connected and movable relative to one another. The object is crushed or cut by closing the upper and lower jaws, for example using a hydraulic actuator.

The jaw assembly is suitable for crushing and/or cutting (also known simply as demolition) objects such as concrete or other objects (e.g., scrap metal). The center and side teeth on the upper and/or lower jaws come into contact with the object and are subject to rapid wear.

Therefore, the jaw assembly in Patent Document 1 is designed to allow the center teeth and side teeth to be replaced.

WO2018/050662

The jaw assembly in Patent Document 1 has the following problems when the object is highly hard:

FIG. 8 is a schematic perspective view of the jaw assembly 100 of Patent Document 1.
8, the jaw assembly 100 includes a first jaw (lower jaw) 102, a second jaw (upper jaw) 108, and a connecting portion 150. The first jaw 102 and the second jaw 108 are rotatable about the connecting portion 150.

The first jaw 102 has a first side tooth 113 and a second side tooth 111 on either side, and a center tooth 110 between the first side tooth 113 and the second side tooth 111.

FIG. 9 is a schematic exploded perspective view of the first jaw 102.
9, the center tooth 110 is inserted into the space between the first arm 132 and the second arm 134 by moving it from the vertical direction. Specifically, the center tooth 110 is inserted in the longitudinal direction of the first arm 132 and the second arm 134 in such a manner that the first mounting leg 116 and the second mounting leg 118 are disposed in front of the first mounting structure 124 and the second mounting structure 126, respectively. In the first stage of attaching the center tooth 110, the first mounting leg 116 and the second mounting leg 118 slide the center tooth 110 along the longitudinal direction (attachment direction) of the first arm 132 and the second arm 134, thereby attaching the center tooth 110 to the first jaw 102. Then, the center tooth 110 is inserted into the space between the first arm 132 and the second arm 134 so that the center tooth 110 is positioned in front of the first mounting structure 124 and the second mounting structure 126 in the mounting direction.

In the second stage, after the center tooth 110 is inserted between the first arm 132 and the second arm 134, the first mounting leg 116 of the center tooth 110 is moved backward along the mounting direction so that the first mounting leg 116 engages with the first mounting structure 124. The same is true for the second mounting leg 118. By sliding the center tooth 110 in the mounting direction, the first mounting structure 124 is inserted into the first recess 120, and the second mounting structure 126 is inserted into the second recess 122 (see FIG. 10). That is, the center tooth 110 moves along the mounting direction until the rear surface of the hook-shaped portion 119b abuts against the second mounting structure 126, and the end of the first mounting leg 116 comes into contact with the plate-like first mounting structure 124 (see FIG. 11). In this position, each of the hook-shaped portions 119a, 119b, and 119c contacts the second mounting structure 126 in the second recess 122.

As shown in Fig. 11, the contact area between the first mounting leg 116 of the center tooth 110 and the first mounting structure 124 is limited at the center. As shown in Fig. 10, the contact area between the hook-shaped portions 119a, 119b, 119c of the second mounting leg 118 and the second mounting structure 126 is also limited.
Therefore, in the jaw assembly 100 of Patent Document 1, when the hardness of the object is high, the contact area is small when the object is dismantled, so that the first mounting leg 116 and the hook-shaped portions 119a, 119b, 119c are damaged, resulting in the destruction of the center tooth 110.
In view of the above problems, the present disclosure provides a jaw having a center tooth that is replaceable and undamaged even when the hardness of an object is high, and a jaw assembly having the jaw.

A jaw according to one embodiment of the present disclosure is a jaw used as one of a pair of jaws of a jaw assembly for dismantling an object, and comprises a first side tooth and a second side tooth arranged on both sides, a center tooth arranged between the first side tooth and the second side tooth, and a main body, the main body houses the first side tooth, the second side tooth, and the center tooth, and has a storage section for storing the center tooth, a first tip hole at a tip side of one side of the storage section and a second tip hole at a tip side of the other side of the storage section, the storage section has a flat pressure-receiving surface in the longitudinal direction, the center tooth has a center tooth hole at its tip side, a center tooth pin is inserted into the first tip hole, the second tip hole, and the center tooth hole so that the center tooth can rotate around the center tooth pin, and when the center tooth is stored in the storage section, the top surface of the center tooth comes into contact with the pressure-receiving surface.
According to the above aspect, since the contact area between the upper surface of the center tooth and the pressure-receiving surface is large, it is possible to provide a jaw portion having a center tooth that is replaceable and undamaged even when the object is of high hardness.

According to one aspect of the present disclosure, it is possible to provide a jaw assembly having a jaw with a replaceable and undamaged center tooth, even when the object is of high hardness.

FIG. 2 is a schematic perspective view of a jaw assembly according to a first embodiment of the present disclosure. FIG. 2 is a schematic exploded perspective view of a jaw assembly according to the first embodiment. 1A and 1B are schematic perspective views of a first jaw portion in the first embodiment, in which FIG. 5A and 5B are diagrams illustrating the operation of the jaw assembly in the first embodiment, in which FIG. 5A shows a state in which the jaw is open, and FIG. 5B shows a state in which the jaw is closed. 1A is a diagram showing the positional relationship between the first jaw portion and the center tooth in embodiment 1, where (a) is a schematic oblique view of the state in which the center tooth is accommodated, (b) is a schematic cross-sectional view of the state in which the center tooth is accommodated, and (c) is a schematic cross-sectional view when the center tooth is at a distance B from the pressure-receiving surface. 10A and 10B are schematic diagrams of a first jaw portion in a second embodiment of the present disclosure, in which FIG. 10A is a schematic cross-sectional view of the first jaw portion, and FIG. 10B is a schematic cross-sectional view of an eccentric bushing. 1A is a diagram explaining a method of installing a center tooth in embodiment 2, in which (a) shows the state in which the center tooth 10 is inserted into the accommodating portion 70, (b) shows the state in which the rear end tooth of the center tooth comes into contact with an object, and (c) shows the state in which the center tooth is fixed to the accommodating portion by an eccentric bush. FIG. 1 is a schematic perspective view of a prior art jaw assembly. FIG. 1 is a schematic exploded perspective view of a first jaw of the prior art; FIG. 1 is a schematic perspective view of a center tooth of the prior art as viewed from the rear. FIG. 2 is a schematic perspective view of a first jaw of the prior art as viewed from the rear.

Below, more specific embodiments of the present disclosure will be described. However, more detailed explanations than necessary may be omitted. For example, detailed explanations of already well-known matters or duplicate explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. Note that the inventors provide the attached drawings and the following explanation to enable those skilled in the art to fully understand the present disclosure, and do not intend for them to limit the subject matter described in the claims. In the following explanation, the same reference symbols are used for identical or similar components.

(Embodiment 1)
Hereinafter, a jaw assembly 1 according to one embodiment of the present disclosure will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of a jaw assembly 1 illustrating one embodiment of the present disclosure.
1, the jaw assembly 1 includes a first jaw 2 (upper jaw) and a second jaw 3 (lower jaw). The first jaw 2 and the second jaw 3 are connected by a connecting portion 15, and the distance between the first jaw 2 and the second jaw 3 can be narrowed or widened around the connecting portion 15 by using, for example, a hydraulic actuator.
FIG. 2 is a schematic exploded perspective view of the jaw assembly 1. As shown in FIG.
The first jaw portion 2 has a main body portion 20, a first side tooth 11, a second side tooth 12, a center tooth 10 between the first side tooth 11 and the second side tooth 12, and a first connecting pin hole 25.
The second jaw portion 3 has a third side tooth 13 , a fourth side tooth 14 , and a second connecting pin hole 26 .
The connecting pin 16 holds the connecting bush 17 in the center and fits into the second connecting pin hole 26. The connecting bush 17 fits into the first connecting pin hole 25. With this configuration, the first jaw 2 and the second jaw 3 are connected by the connecting portion 15 and rotate around the connecting portion 15.

As shown in FIG. 2, the first side tooth 11 has multiple triangular first teeth 55 (three in FIG. 2) on the upper surface of the substrate 60, and has a first fixing hole 61 and a second fixing hole 62 on the lower surface of the substrate 60.

3A is a schematic overall perspective view of the first jaw portion 2, and FIG. 3B is a schematic exploded perspective view of the first jaw portion 2. FIG. 3A is a schematic overall perspective view of the first jaw portion 2, and FIG.
As shown in FIG. 3A , the first side tooth 11 is housed in a first side tooth housing portion 33 , and the second side tooth 12 is housed in a second side tooth housing portion 43 .
3(b), the first side tooth housing 33 is box-shaped with a hollow interior and has a rectangular opening 29 with a rim on the top surface. When the first side tooth 11 is housed in the first side tooth housing 33, the first fixing hole 61 and the second fixing hole 62 of the first side tooth 11 are housed in the first side tooth housing 33. At that time, the first fixing hole 61 communicates with the first seat hole 31, and the second fixing hole 61 communicates with the second seat hole 31.
Then, the substrate 60 of the first side tooth 11 comes into contact with the edge of the opening 29. When the side tooth pin 35 is inserted into the first seat hole 31 and the second seat hole 32 in this state, the first side tooth 11 is fixed in the first side tooth accommodating portion 33 (see FIGS. 1 and 3).

Like the first side tooth 11, the second side tooth 12, the third side tooth 13, and the fourth side tooth 14 have multiple triangular first teeth 55 (three in Figure 2) on the upper surface of the substrate 60, and have a first fixing hole 61 and a second fixing hole 62 on the lower surface of the substrate 60 (see Figure 2).
Each of the second side tooth housing portion 43, the third side tooth housing portion 44, and the third side tooth housing portion 45 is a hollow box-shaped portion similar to the first side tooth housing portion 33, and has a rectangular opening 29 with a rim on the upper surface. Similarly to the first side tooth 11, each of the second side tooth 12, the third side tooth 13, and the fourth side tooth 14 has its substrate 60 contacted with the rim of its opening 29. Then, the side tooth pin 35 is inserted into the first sheet hole 31, and the side tooth pin 35 is also inserted into the second sheet hole 32, and the second side tooth 12, the third side tooth 13, and the fourth side tooth 14 are fixed to the second side tooth housing portion 43, the third side tooth housing portion 44, and the fourth side tooth housing portion 45, respectively (see FIGS. 1 and 3).

FIG. 4 is an operational diagram showing the operation of the jaw assembly 1. As shown in FIG.
4(a) is a diagram showing a state in which the first jaw 2 and the second jaw 3 are opened and an object W is sandwiched between the first jaw 2 and the second jaw 3. Specifically, the object W is sandwiched between the center tooth 10, the third side tooth 13, and the fourth side tooth 14 of the first jaw 2.
4(b) is a diagram showing the first jaw 2 and second jaw 3 in a closed state, in which, when viewed from the front in the longitudinal direction of the first jaw 2, the first tooth 55 of the first side tooth 11 overlaps with the first tooth 55 of the third side tooth 13. Also, when viewed from the longitudinal direction of the first jaw 2, the first tooth 55 of the second side tooth 12 overlaps with the first tooth 55 of the fourth side tooth 14. The lower part of the center tooth 10 is hollow, and there is no first tooth 55 facing the center tooth 10.

FIG. 5 is a diagram showing the positional relationship between the first jaw 2 and the center tooth 10.
5(a) and (b), the main body 20 of the first jaw 2 has a housing 70 that houses the center tooth 10 inside the main body 20. The housing 70 has a flat pressure-receiving surface 71 on the upper surface in the longitudinal direction, and the lower surface opposite the pressure-receiving surface 71 is open. The housing 70 also has a back chamber 72 at the rear.

The positioning of the housing portion 70 and the center tooth 10 will now be described.
The center tooth 10 has an end 59 that extends rearward (see FIGS. 3(b) and 5). The center tooth 10 is inserted from the underside of the housing 70, with the end 59 of the center tooth 10 inserted into the innermost chamber 72 of the housing 70 and the rightmost portion of the center tooth 10 supported by the innermost chamber 72.

As shown in Figure 5 (b), when the center tooth 10 comes into contact with an object W and the crushing force P of the object is applied to the rear end tooth 58 described later, the distance A between the pressure-receiving surface 71 and the upper surface 30 of the center tooth 10 is set so that the pressure-receiving surface 71 and the center C0 of the center tooth pin 50 come into uniform contact over a wide area.
The center tooth 10 becomes rotatable by inserting a center tooth pin 50 with a center bush 51 into the first tip hole 21, the second tip hole 22, and the center tooth hole 23. The center tooth pin 50 with one center bush 51 positions the housing portion 70 and the center tooth 10, and the pressure-receiving surface 71 and the upper surface 30 of the center tooth 10 come into contact with each other over a uniformly wide area.
With the above configuration, the pressure-receiving surface 71 and the upper surface 30 of the center tooth 10 are in contact over a uniform, wide area, so the center tooth 10 can operate without being damaged even if the object W is hard. Furthermore, by removing one center tooth pin 50, the center tooth 10 can be easily removed from the housing 70, making it easy to replace the center tooth 10.

5B, the second tooth 56 of the center tooth 10 has a pointed tip tooth 57 on the tip side and a rear tooth 58 on the rear side. The tip of the rear tooth 58 has an S-shape with a concave portion and a convex portion in that order from the tip side.
With the above-described configuration, after a part of the object W is crushed by the convex portion of the rear end tooth 58, the object W is crushed while being held by the concave portion, so that the object W can be disassembled efficiently.

(Embodiment 2)
In the first jaw portion 2 of the first embodiment, the distance A between the pressure receiving surface 71 and the center C0 of the center two spins 50 is required to be accurate.
5C is a schematic cross-sectional view of the first jaw 2 in which the accuracy of the distance A is poor. That is, the distance B between the pressure-receiving surface 71 and the center C1 of the center two pins 50 is longer than the distance A.
As shown in the enlarged view of Figure 5 (c), it can be seen that the further to the left the top surface 30 of the center tooth 10 is, the farther it is from the pressure-receiving surface 71, and the smaller the contact area between the pressure-receiving surface 71 and the top surface 30 of the center tooth 10 becomes.
As described above, the first jaw portion 2 of the first embodiment requires high accuracy in the distance A, and there is still room for improvement.

FIG. 6 is a schematic cross-sectional view of the first jaw 2 in the second embodiment.
The second embodiment differs from the first embodiment in that an eccentric bush 53 is used in place of the center bush 51 of the first jaw 2 of the first embodiment.
In the following, an explanation will be given using numerical values as an example, but these are given for the purpose of explanation only and the numerical values can be changed as appropriate.

As shown in FIG. 6A , an eccentric bushing 53 is inserted into the center tooth hole 23 of the center tooth 10 .
Fig. 6(b) is a diagram showing an example of the eccentric bushing 53. As shown in Fig. 6(b), the eccentric bushing 53 has an eccentric bushing hole 54 into which the center two pin 50 is inserted. The distance L0 between the center C1 of the eccentric bushing 53 and the center C2 of the eccentric bushing hole 54 is offset by about 3 mm on a straight line L1 that extends from the upper left to the lower right at an angle of 42 degrees from the horizontal. In this state, the width of the eccentric bushing 53 on the straight line L1 at the upper left is 5 mm, and the width at the lower right is 11 mm.
The eccentric bushing hole 54 rotates around the center C1 of the eccentric bushing 53.

A method of mounting the center tooth 10 of the second embodiment in the receiving portion 70 (assembly method) will be described with reference to FIG.
Figure 7 (a) shows the state in which the center tooth 10 is inserted into the storage section 70 with the first jaw 2 and the second jaw 3 open and not in contact with the object W.
6B, in the eccentric bushing 53, the center C2 of the center two spins 50 is located on a straight line L1 that is inclined at 42 degrees from the horizontal and has the center C1 of the eccentric bushing 53 as the center. The center C2 of the center two spins 50 is located 52 mm below the pressure receiving surface 71, and the center C1 of the eccentric bushing 53 is located 54 mm below the pressure receiving surface 71. Therefore, the distance L0 between the center C1 of the eccentric bushing 53 and the center C2 of the center two spins 50 is 2 mm in the vertical direction, and is approximately 3 mm on the straight line L1 that is inclined at 42 degrees.
There is a gap of 4 mm between the pressure-receiving surface 71 and the top surface 30 of the center tooth 10. The end portion 59 of the center tooth 10 and the side surface of the inner chamber 72 are separated by a distance of 21 mm and are not in contact with each other.

Next, as shown in FIG. 7(b), without rotating the eccentric bushing 53, the distance between the first jaw 2 and the second jaw 3 is narrowed, and the rear end tooth 58 of the center tooth 10 is brought into contact with the object W. At this time, the center tooth 10 rotates in the direction of arrow A around the center C2 of the center tooth pin 50, and the right end of the upper surface 30 of the center tooth 10 comes into contact with the pressure-receiving surface 71. At the left end of the pressure-receiving surface 71, there is a gap of 4 mm between the pressure-receiving surface 71 and the upper surface 30 of the center tooth 10.

7(c), the eccentric bushing 53 is rotated 84 degrees counterclockwise from the initial position, so that the center tooth 10 moves in the direction of the arrow B, and the pressure-receiving surface 71 and the upper surface 30 of the center tooth 10 come into uniform contact with each other without any gaps.
At this time, the contact area between the upper surface 30 of the center tooth 10 and the pressure-receiving surface 71 is larger than the contact area between the first side tooth 11 and the first side tooth accommodating portion 33, or the contact area between the second side tooth 12 and the second side tooth accommodating portion 43.
According to the above embodiment, the precision of the distance between the pressure receiving surface 71 and the center of the center tooth pin 50 is not required, and the center tooth 10 can be easily installed in the storage section 70. In addition, since the area of the pressure receiving surface is large, the center tooth 10 will not break, and even hard objects can be crushed.

In addition, in the first and second embodiments, the first jaw portion 2 is the upper jaw portion and the second jaw portion 3 is the lower jaw portion, but the first jaw portion 2 may be the lower jaw portion and the second jaw portion 3 may be the upper jaw portion.

The inventions according to embodiments 1 and 2 can be substituted or combined as long as no contradiction arises.

As described above, the present disclosure includes the jaws and jaw assemblies having the jaws described in the following items.

[Item 1]
A jaw for use in one of a pair of jaws of a jaw assembly for dismantling an object, comprising:
The toothbrush includes a first side tooth and a second side tooth arranged on both sides, a center tooth arranged between the first side tooth and the second side tooth, and a main body portion,
the main body portion houses the first side tooth, the second side tooth, and the center tooth, and has a housing portion for housing the center tooth, a first tip hole on a tip side of one side surface of the housing portion, and a second tip hole on a tip side of the other side surface of the housing portion;
The housing portion has a flat pressure-receiving surface in a longitudinal direction,
The center tooth has a center tooth hole on the tip side,
The center tooth pin is inserted into the first tip hole, the second tip hole, and the center tooth hole, so that the center tooth can rotate around the center tooth pin;
A jaw portion where the upper surface of the center tooth comes into contact with the pressure-receiving surface when the center tooth is stored in the storage portion.
According to the above aspect, the center tooth can operate without being damaged even if the object is very hard. In addition, the center tooth can be removed from the housing by removing one connecting pin, so that the center tooth can be easily replaced.

[Item 2]
the main body further includes a first side tooth housing portion that houses a first side tooth on a side surface of the housing portion on the first tip hole side, and a second side tooth housing portion that houses a second side tooth on a side surface of the housing portion on the second tip hole side,
A jaw portion as described in item 1, wherein the contact area between the upper surface of the center tooth and the pressure-receiving surface is larger than the contact area between the first side tooth and the first side tooth accommodating portion or the contact area between the second side tooth and the second side tooth accommodating portion.
According to the above aspect, even if the object has a high hardness, the center tooth can operate without being damaged.

[Item 3]
3. The jaw according to item 1 or 2, further comprising an eccentric bushing disposed in the first end hole, the second end hole and the center tooth hole, into which the center tooth pin is inserted.
According to the above aspect, precision in the distance between the pressure receiving surface and the center of the center tooth pin is not required, and the center tooth can be easily installed in the housing portion.

[Item 4]
The center tooth has a pointed tip tooth on the tip side and a rear end tooth on the rear side,
4. The jaw member according to any one of items 1 to 3, wherein the tip of the rear end tooth is S-shaped having a concave portion and a convex portion in that order from the tip side.
According to the above configuration, after a part of the object W is crushed by the convex portion of the rear end tooth, the object W is crushed while being held by the concave portion, so that the object W can be disassembled efficiently.

[Item 5]
A jaw assembly comprising: a jaw portion according to any one of items 1 to 4; and another jaw portion different from the jaw portion; the jaw portion and the other jaw portion constitute a pair of jaw portions; and the jaw portion and the other jaw portion are disposed opposite each other.
The above configuration provides a jaw assembly that allows the center tooth to operate without being damaged even when the object is of high hardness. Also, the jaw assembly allows the center tooth to be removed from the housing by removing one connecting pin, making it easy to replace the center tooth.

1 Jaw assembly 2 First jaw 8 Second jaw 10 Centre tooth 11 First side tooth 12 Second side tooth 13 Third side tooth 14 Fourth side tooth 20 Main body 21 First tip hole 22 Second tip hole 23 Centre tooth hole 30 Upper surface of centre tooth 33 First side tooth receiving portion 43 Second side tooth receiving portion 50 Centre tooth pin 53 Eccentric bush 57 Tip tooth 58 Rear tooth 70 Receiving portion 71 Pressure receiving surface

Claims (5)

A jaw for use in one of a pair of jaws of a jaw assembly for dismantling an object, comprising:
The toothbrush includes a first side tooth and a second side tooth arranged on both sides, a center tooth arranged between the first side tooth and the second side tooth, and a main body portion,
the main body portion houses the first side tooth, the second side tooth, and the center tooth, and has a housing portion for housing the center tooth, a first tip hole on a tip side of one side surface of the housing portion, and a second tip hole on a tip side of the other side surface of the housing portion;
The housing portion has a flat pressure-receiving surface in a longitudinal direction,
The center tooth has a center tooth hole on the tip side,
The center tooth pin is inserted into the first tip hole, the second tip hole, and the center tooth hole, so that the center tooth can rotate around the center tooth pin;
A jaw portion where the upper surface of the center tooth comes into contact with the pressure-receiving surface when the center tooth is stored in the storage portion. the main body further includes a first side tooth housing portion that houses a first side tooth on a side surface of the housing portion on the first tip hole side, and a second side tooth housing portion that houses a second side tooth on a side surface of the housing portion on the second tip hole side,
A jaw portion as described in claim 1, wherein the contact area between the upper surface of the center tooth and the pressure-receiving surface is larger than the contact area between the first side tooth and the first side tooth accommodating portion, or the contact area between the second side tooth and the second side tooth accommodating portion. The jaw portion according to claim 1 or 2, which has an eccentric bushing disposed in the first tip hole, the second tip hole, and the center tooth hole, into which the center tooth pin is inserted. The center tooth has a pointed tip tooth on the tip side and a rear end tooth on the rear side,
3. The jaw portion according to claim 1, wherein the tip of the rear end tooth is S-shaped having a recess and a protrusion in that order from the tip side. A jaw assembly having the jaw according to claim 1 or 2 and another jaw, the jaw and the other jaw forming a pair of jaws, and the jaw and the other jaw arranged opposite each other.