Excavation tool
Provided is an excavation tool which can firmly fix a locking pin so that the locking pin does not move even in the case of an impact during excavation and/or the locking pin being pushed out in the insertion/removal direction. The excavation tool ( 10 ) includes a tool body ( 20 ) having an attaching hole ( 32 ) and an attaching member ( 40 ). The attaching member ( 40 ) is provided with an attaching shaft ( 45 ) inserted into the attaching hole ( 32 ), and the outer peripheral surface of the attaching shaft ( 45 ) is provided with a groove ( 46 ) which crosses the extension direction of the attaching shaft ( 45 ). The tool body ( 40 ) is provided with a pin hole ( 33 ) extending in a direction crossing the extension direction of the attaching hole ( 32 ). A part of the pin hole ( 33 ) passes through the attaching hole ( 32 ). A locking pin ( 56 ), which can engage with the groove ( 46 ) of the attaching shaft ( 45 ) inserted into the attaching hole ( 32 ), is inserted into the pin hole ( 33 ). An opening of the pin hole ( 33 ) is provided with a fixing member ( 50 ) which is a rigid body and abuts on the end face of the locking pin ( 56 ) to fix the locking pin, and a locking portion ( 57 ) which locks the fixing member ( 50 ) in the extension direction of the pin hole ( 33 ) to fix the fixing member.
1. An excavation tool comprising:
a tool body mounted on a tip of an excavation machine and having an attaching hole, and
an attaching member detachably mounted on the tool body;
wherein
the attaching member is provided with an attaching shaft inserted into the attaching hole;
a groove, which crosses the extension direction of the attaching shaft, is formed in the outer peripheral surface of the attaching shaft;
a pin hole, which extends in a direction crossing the extension direction of the attaching hole, is formed in the tool body;
a part of the pin hole passes through the attaching hole;
a locking pin, which can engage with the groove of the attaching shaft inserted into the attaching hole, is inserted into the pin hole; and
an opening of the pin hole is provided with
a fixing member which is a rigid body and abuts on the end face of the locking pin to fix the locking pin, and
a locking portion which locks the fixing member in the extension direction of the pin hole to fix the fixing member.
2. The excavation tool according to claim 1 , wherein an auxiliary member, which maintains an engagement state between the fixing member and the locking portion, is embedded in the tool body.
3. The excavation tool according to claim 2 , wherein the auxiliary member is made of an elastic material.
4. The excavation tool according to claim 3 , wherein a sliding groove, along which the fixing member slidingly moves, is provided;
the pin hole is opened at one end of the sliding groove together with the locking portion formed thereat; and
a loading portion of the fixing member is provided at the other end of the sliding groove.
5. The excavation tool according to claim 4 , wherein
the tool body is used as a device rotatable on a central axis;
the attaching hole is formed so as to be opened to the tip of the device;
the attaching member is used as a bit head having a bit excavating portion to which a tip made of a hard material is fixed;
the attaching shaft is integrally connected to the bit excavating portion;
the outer peripheral surface of the attaching shaft is provided with a groove, which crosses the extension direction of the attaching shaft and also extends in a peripheral direction;
when the device rotates in one direction, the bit head rotates on the rotational axis, and the bit head also protrudes outward; and
when the device rotates in the other direction, the bit head rotates on the rotational axis, and the bit head retract inward.
6. The excavation tool according to claim 3 , wherein
the tool body is used as a device rotatable on a central axis;
the attaching hole is formed so as to be opened to the tip of the device;
the attaching member is used as a bit head having a bit excavating portion to which a tip made of a hard material is fixed;
the attaching shaft is integrally connected to the bit excavating portion;
the outer peripheral surface of the attaching shaft is provided with a groove, which crosses the extension direction of the attaching shaft and also extends in a peripheral direction;
when the device rotates in one direction, the bit head rotates on the rotational axis, and the bit head also protrudes outward; and
when the device rotates in the other direction, the bit head rotates on the rotational axis, and the bit head retract inward.
7. The excavation tool according to claim 2 , wherein a sliding groove, along which the fixing member slidingly moves, is provided;
the pin hole is opened at one end of the sliding groove together with the locking portion formed thereat; and
a loading portion of the fixing member is provided at the other end of the sliding groove.
8. The excavation tool according to claim 7 , wherein
the tool body is used as a device rotatable on a central axis;
the attaching hole is formed so as to be opened to the tip of the device;
the attaching member is used as a bit head having a bit excavating portion to which a tip made of a hard material is fixed;
the attaching shaft is integrally connected to the bit excavating portion;
the outer peripheral surface of the attaching shaft is provided with a groove, which crosses the extension direction of the attaching shaft and also extends in a peripheral direction;
when the device rotates in one direction, the bit head rotates on the rotational axis, and the bit head also protrudes outward; and
when the device rotates in the other direction, the bit head rotates on the rotational axis, and the bit head retract inward.
9. The excavation tool according to claim 2 , wherein
the tool body is used as a device rotatable on a central axis;
the attaching hole is formed so as to be opened to the tip of the device;
the attaching member is used as a bit head having a bit excavating portion to which a tip made of a hard material is fixed;
the attaching shaft is integrally connected to the bit excavating portion;
the outer peripheral surface of the attaching shaft is provided with a groove, which crosses the extension direction of the attaching shaft and also extends in a peripheral direction;
when the device rotates in one direction, the bit head rotates on the rotational axis, and the bit head also protrudes outward; and
when the device rotates in the other direction, the bit head rotates on the rotational axis, and the bit head retract inward.
10. The excavation tool according to claim 1 , wherein a sliding groove, along which
the fixing member slidingly moves, is provided;
the pin hole is opened at one end of the sliding groove together with the locking portion formed thereat; and
a loading portion of the fixing member is provided at the other end of the sliding groove.
11. The excavation tool according to claim 10 , wherein
the tool body is used as a device rotatable on a central axis;
the attaching hole is formed so as to be opened to the tip of the device;
the attaching member is used as a bit head having a bit excavating portion to which a tip made of a hard material is fixed;
the attaching shaft is integrally connected to the bit excavating portion;
the outer peripheral surface of the attaching shaft is provided with a groove, which crosses the extension direction of the attaching shaft and also extends in a peripheral direction;
when the device rotates in one direction, the bit head rotates on the rotational axis, and the bit head also protrudes outward; and
when the device rotates in the other direction, the bit head rotates on the rotational axis, and the bit head retract inward.
12. The excavation tool according to claim 1 ,
wherein
the tool body is used as a device rotatable on a central axis;
the attaching hole is formed so as to be opened to the tip of the device;
the attaching member is used as a bit head having a bit excavating portion to which a tip made of a hard material is fixed;
the attaching shaft is integrally connected to the bit excavating portion;
the outer peripheral surface of the attaching shaft is provided with a groove, which crosses the extension direction of the attaching shaft and also extends in a peripheral direction;
when the device rotates in one direction, the bit head rotates on the rotational axis, and the bit head also protrudes outward; and
when the device rotates in the other direction, the bit head rotates on the rotational axis, and the bit head retract inward.