IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0917988
(2006-06-21)
|
등록번호 |
US-8235136
(2012-08-07)
|
우선권정보 |
DE-10 2005 028 918 (2005-06-22) |
국제출원번호 |
PCT/EP2006/005978
(2006-06-21)
|
§371/§102 date |
20100318
(20100318)
|
국제공개번호 |
WO2006/136401
(2006-12-28)
|
발명자
/ 주소 |
- Berger, Rudolf
- Schmid, Wolfgang
|
출원인 / 주소 |
- Wacker Neuson Produktion GmbH & Co. KG
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
12 |
초록
▼
A drilling and/or percussive hammer comprises a handle and a hammer housing, which can move relative to the handle and inside of which, among other things, a pneumatic spring percussive mechanism is housed. The pneumatic spring of the pneumatic spring percussive mechanism can be ventilated via a no-
A drilling and/or percussive hammer comprises a handle and a hammer housing, which can move relative to the handle and inside of which, among other things, a pneumatic spring percussive mechanism is housed. The pneumatic spring of the pneumatic spring percussive mechanism can be ventilated via a no-load operation duct that is opened and closed by a valve. The valve can be opened and closed according to a pressing force acting upon the handle. A delay device controls the valve during closing so that the valve reaches the position corresponding to the detected pressing force only with a time delay. This causes a smooth transition from the no-load operation to the percussive operation.
대표청구항
▼
1. A drilling and/or impact hammer, comprising: a pneumatic spring percussion mechanism having a drive piston that is capable of being moved back and forth, and having a percussion piston that is capable of being driven by the drive piston, a hollow space for accommodating an air spring being formed
1. A drilling and/or impact hammer, comprising: a pneumatic spring percussion mechanism having a drive piston that is capable of being moved back and forth, and having a percussion piston that is capable of being driven by the drive piston, a hollow space for accommodating an air spring being formed between the drive piston and the percussion piston;a no-load channel for connecting the hollow space to the surrounding environment of the pneumatic spring percussion mechanism and for ventilating the hollow space in a no-load operating state;a valve that is situated in the no-load channel for opening the no-load channel in the no-load operating state and for closing the no-load channel in a percussion operating state;an acquisition device for acquiring a control quantity that distinguishes percussion operation and no-load operation;the valve being capable of being opened and closed dependent on the control quantity, and for this purpose assuming a position corresponding to the control quantity; anda delay device via which the valve is capable of being controlled during closing in such a way that it reaches the position corresponding to the acquired control quantity with a time delay, and whereinthe time delay is dimensioned such that it extends over a time span of several impact cycles, each comprising a back-and-forth movement of the drive piston. 2. The drilling and/or percussive hammer as recited in claim 1, wherein, during opening, the valve is capable of being controlled in such a way that it essentially immediately reaches a position corresponding to the acquired control quantity. 3. The drilling and/or percussive hammer as recited in claim 1, wherein the valve essentially continuously changes its position during the time span defined by the time delay. 4. The drilling and/or percussive hammer as recited in claim 1, wherein the control quantity is a quantity selected from the group consisting of: a pressure force that can be applied by an operator,a position of a tool,a position of the percussion piston, anda position of a rivet header,a position of an actuating element that can be manipulated by the operator and that controls a drive of the drive piston. 5. The drilling and/or percussive hammer as recited in claim 4, wherein a front position, relative to a working direction of at least one of the tool, of the rivet header, and of the percussion piston is used as a criterion for no-load operation, while a position that is displaced towards the rear relative to the front position of at least one of the tool, of the rivet header, and of the percussion piston is used as a criterion for percussion operation. 6. The drilling and/or percussive hammer as recited in one of claim 4, wherein the acquisition device has a device for determining the position of at least one of the tool, of the rivet header, and the percussion piston at least two points, the one point being capable of being allocated to no-load operation and the other point being capable of being allocated to percussion operation. 7. The drilling and/or percussive hammer as recited in one of claim 1, wherein at least one handle is provided with a grip point so that the operator can hold and press on the drilling and/or percussive hammer;the control quantity is a pressure force that can be applied to the handle by the operator;at least the pneumatic spring percussion mechanism is surrounded by a hammer housing;the acquisition device for acquiring the applied force is situated in the flow of force between the grip point and the hammer housing;the valve is capable of being opened and closed dependent on the acquired applied force, and for this purpose assumes a position corresponding to the applied force; and whereinvia the delay device, the valve can be controlled during closing in such a way that it reaches the position corresponding to the acquired applied force with the time delay. 8. The drilling and/or percussive hammer as recited in claim 7, wherein, by increasing the applied force, a transition from no-load operation to percussion operation is brought about, and by reducing the applied force, a transition from percussion operation to no-load operation is brought about. 9. The drilling and/or percussive hammer as recited in claim 7, wherein the handle is capable of being moved relative to the hammer housing. 10. The drilling and/or percussive hammer as recited in claim 9, wherein, between the handle and the hammer housing, there is provided a spring system that is part of the acquisition device and that holds handle relative to the hammer housing with a prespecified spring force. 11. The drilling and/or percussive hammer as recited in claim 10, wherein the acquisition device has a stop that is coupled to the handle and that is capable of being displaced with the handle relative to the hammer housing, against the action of the spring system, in such a way that its displacement is essentially proportional to the force applied by the operator. 12. The drilling and/or percussive hammer as recited in claim 10, wherein the spring system is also a component of a device for vibration after decoupling of the handle from the pneumatic spring percussion mechanism. 13. The drilling and/or percussive hammer as recited in claim 7, wherein the acquisition device has a sensor for acquiring a state in which the handle is pressed against the hammer housing against the action of the spring system, and for producing a pressure signal;the valve has a valve element that is capable of being controlled at least one of mechanically, electrically, electromechanically, or electromagnetically, and whereinthe pressure signal is capable of being supplied to a control device that correspondingly controls the valve element in order to open and close the valve, the closing of the valve being extended over a particular span of time. 14. The drilling and/or percussive hammer as recited in claim 13, wherein the sensor is a proximity sensor or a force measuring sensor. 15. The drilling and/or percussive hammer as recited in claim 13, wherein a position sensor is provided for acquiring the position of the drilling and/or percussive hammer in space relative to a horizontal plane and for producing a corresponding position signal;the position signal is capable of being supplied to the control unit; and whereinby evaluating the pressure signal and the position signal, the control unit controls the valve element. 16. The drilling and/or percussive hammer as recited in claim 15, wherein, while the evaluation of the pressure signal and of the position signal, a deviation of the position of the drilling and/or percussive hammer from the horizontal plane is capable of being taken into account in such a way that the resulting pressure signal is capable of being subjected to a correction taking into account the effective weights of the handle, of the hammer housing, and of the components contained therein, as well as of a tool. 17. The drilling and/or percussive hammer as recited in one of claim 7, wherein a no-load position of the handle is used as a criterion for no-load operation, while an operating position of the handle is used as a criterion for percussion operation. 18. The drilling and/or percussive hammer as recited in claim 1, wherein the control quantity comprises an applied force by the operator, and wherein a sleeve that is capable of axial movement and that forms a control element of the valve is provided whose axial position is capable of being changed dependent on the applied force. 19. The drilling and/or percussive hammer as recited in claim 18, wherein the sleeve is connected to the handle in an axial direction in such a way that a reduction of the applied force by the operator brings about an immediate and proportional change in the position of the valve. 20. The drilling and/or percussive hammer as recited in claim 19, wherein the sleeve is coupled to the handle in the other axial direction in such a way that an increase in the applied force and a resulting displacement of the handle relative to the hammer housing brings about, via the delay device, a temporarily delayed displacement of the sleeve. 21. The drilling and/or percussive hammer as recited in claim 1, wherein the drive piston has a hollow construction;the percussion piston is capable of being axially moved in the drive piston, and whereinin a cylindrical wall of the drive piston, there is provided at least one opening that, depending on the axial position of the drive piston, forms a part of the no-load channel. 22. The drilling and/or percussive hammer as recited in claim 21, wherein the drive piston is surrounded by a percussion mechanism tube in which at least one radial opening, allocated to the opening in drive piston, is provided that forms a part of the no-load channel. 23. The drilling and/or percussive hammer as recited in claim 22, wherein the percussion mechanism tube is surrounded by the sleeve;the sleeve has a radial opening that is allocated to the radial opening of the percussion mechanism tube;the sleeve is capable of being axially displaced on the percussion mechanism tube against the action of a spring device in such a way that, in order to open the valve, the radial opening of the sleeve is capable of being moved over the radial opening of the percussion mechanism tube, and in order to close the valve the sleeve covers the radial opening of the percussion mechanism tube. 24. The drilling and/or percussive hammer as recited in claim 23, wherein the spring device presses the sleeve into the closed position. 25. The drilling and/or percussive hammer as recited in claim 23, wherein the delay device has a hollow space, formed between the sleeve and the percussion mechanism tube, whose volume changes dependent on the relative position of the percussion mechanism tube and the sleeve;the hollow space is connected to the surrounding environment via a delay opening;the delay opening is dimensioned such that it ensures a pre-specified air volume flow. 26. The drilling and/or percussive hammer as recited in claim 25, wherein the hollow space has a non-return valve via which an excess air pressure existing in the hollow space can be dismantled. 27. The drilling and/or percussive hammer as recited in claim 25, wherein, when the applied force is increased, the sleeve moves in such a way that the volume of the hollow space is enlarged, the movement speed of the sleeve being limited by the pre-specified air volume flow via the delay opening, in particular being lower than a relative speed, brought about by the applied force, between the handle and the hammer housing. 28. The drilling and/or percussive hammer as recited in claim 25, wherein, when there is a reduction of the applied force, the sleeve moves in such a way that the volume of the hollow space is reduced, and at least a part of the air situated in the hollow space flowing flows out via the non-return valve, in such a way that the speed of movement of the sleeve corresponds essentially to the relative speed between the handle and the hammer housing. 29. The drilling and/or percussive hammer as recited in claim 1, wherein the acquisition device has a sensor for acquiring the control quantity and for producing a control signal;the valve has a valve element that is capable of being one of controlled mechanically, electrically, electromechanically, and electromagnetically, and whereinthe control signal is capable of being supplied to a control device that correspondingly controls the valve element in order to open and close the valve, the closing of the valve being extended over a certain span of time.
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