Reaction force cushioning mechanism for an impact tool
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B25D-017/24
B25D-017/06
출원번호
US-0191866
(2011-07-27)
등록번호
US-8991517
(2015-03-31)
우선권정보
JP-2010-173845 (2010-08-02)
발명자
/ 주소
Sugiyama, Yoshio
Kamegai, Hikaru
Furusawa, Masanori
출원인 / 주소
Makita Corporation
대리인 / 주소
Oliff PLC
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
An impact tool includes a reaction force transmitting member, a first elastic member that biases the transmitting member forward, and a second elastic member that is pushed by the transmitting member and compressively deforms when the transmitting member moves rearward by receiving a striking reacti
An impact tool includes a reaction force transmitting member, a first elastic member that biases the transmitting member forward, and a second elastic member that is pushed by the transmitting member and compressively deforms when the transmitting member moves rearward by receiving a striking reaction force caused when a tool bit strikes a workpiece, thereby cushioning the force. When the tool bit is pressed against the workpiece, the transmitting member is pushed by the tool bit and compresses the first elastic member, and comes in contact with the second elastic member in an uncompressed state, so that the transmitting member is placed in a predetermined working position in the longitudinal direction. When the transmitting member receives the striking reaction force in the working position, the transmitting member moves rearward in the axial direction of the tool bit and compressively deforms the second elastic member, thereby cushioning the striking reaction force.
대표청구항▼
1. An impact tool which performs a predetermined operation on a workpiece at least by an axial linear movement of a tool bit which is mounted in a front end region of a tool body, the impact tool comprising: a reaction force transmitting member configured to be movable in an axial direction of the t
1. An impact tool which performs a predetermined operation on a workpiece at least by an axial linear movement of a tool bit which is mounted in a front end region of a tool body, the impact tool comprising: a reaction force transmitting member configured to be movable in an axial direction of the tool bit and to be moved rearward, in a direction away from the tool bit, by receiving a striking reaction force caused when the tool bit strikes the workpiece;a first elastic member that biases the reaction force transmitting member forward; anda second elastic member configured to be pushed by the reaction force transmitting member and compressively deform, thereby cushioning the striking reaction force, when the reaction force transmitting member moves rearward by receiving the striking reaction force, whereina first initial load of the first elastic member is set to be smaller than a second initial load of the second elastic member,when the tool bit is pressed against the workpiece, the reaction force transmitting member is pushed by the tool bit and compresses the first elastic member as the second elastic member remains uncompressed relative to the second initial load, so that the reaction force transmitting member is placed in a predetermined working position in the longitudinal direction, and when the reaction force transmitting member receives the striking reaction force in the working position, the reaction force transmitting member moves rearward in the axial direction of the tool bit and compressively deforms the second elastic member, thereby cushioning the striking reaction force, and the first and second elastic members are arranged in tandem in the axial direction of the tool bit. 2. The impact tool as defined in claim 1, further comprising: a striking element configured to move linearly to linearly drive the tool bit; anda cylinder that houses the striking element,wherein the cylinder is configured to receive a force acting upon the second elastic member. 3. The impact tool as defined in claim 1, further comprising: a striking element configured to move linearly to linearly drive the tool bit; anda cylinder that houses the striking element,wherein the reaction force transmitting member comprises a cylindrical member, and the cylindrical member and the first elastic member are arranged in parallel such that the first elastic member is disposed radially inward of the cylindrical member in a predetermined region on the cylinder in the axial direction of the tool bit. 4. The impact tool as defined in claim 1, further comprising: a striking element configured to move linearly to linearly drive the tool bit; anda cylinder that houses the striking element, whereinthe reaction force transmitting member comprises a cylindrical member that is slidably fitted on the cylinder, the cylindrical member having a passage configured to provide communication between a cylinder inner space formed in front of the striking element and an outside space, and a nonreturn valve configured to allow air flow from the cylinder inner space to the outside space through the passage and block air flow in an opposite direction,when the tool bit is pressed against the workpiece and the cylindrical member is placed in a predetermined working position, the passage is closed by the cylinder so that the nonreturn valve is deactivated, andwhen the tool bit pressed against the workpiece is released and the cylindrical member is moved forward to an initial position by the biasing force of the first elastic member, the cylinder no longer closes the passage so that the nonreturn valve is allowed to activate. 5. The impact tool as defined in claim 1, further comprising: a striking element configured to move linearly to linearly drive the tool bit;a cylinder that houses the striking element;a front spring receiving ring that is prevented from moving forward relative to the cylinder; anda rear spring receiving ring that is prevented from moving rearward relative to the cylinder,wherein the second elastic member comprises a compression coil spring and is elastically disposed in a pre-compressed state between the front spring receiving ring and the rear spring receiving ring. 6. The impact tool as defined claim 5, wherein the cylinder includes a retaining ring held in contact with the front spring receiving ring, the retaining ring preventing the front spring receiving ring from moving forward relative to the cylinder while receiving a rear end of the first elastic member,the front spring receiving ring has a larger diameter than the retaining ring, andwhen the tool bit is pressed against the workpiece, a rear end surface of the reaction force transmitting member contacts a front surface of an outer region of the front spring receiving ring.
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