IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0155084
(1980-06-02)
|
우선권정보 |
JP-0071687 (1979-06-04) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Nippon Pneumatic Manufacturing Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
29 인용 특허 :
1 |
초록
▼
The invention relates to a control apparatus for a pneumatic impact wrench driven by an air motor. The pneumatic impact wrench according to the invention comprises a torsion bar, a spindle case, an orifice-shaped rotation suspending valve adapted to narrow or close an exhaust port provided on the to
The invention relates to a control apparatus for a pneumatic impact wrench driven by an air motor. The pneumatic impact wrench according to the invention comprises a torsion bar, a spindle case, an orifice-shaped rotation suspending valve adapted to narrow or close an exhaust port provided on the torsion bar when the torsion bar is twisted, a pneumatic double-acting main valve adapted to be opened and closed by diaphragms provided intermediately in a passage for supplying compressed air to the air motor, a fluidic element connected to a pilot passage communicating with the control side of the main valve, a conflux pipe and a control valve, the conflux pipe being caused to communicate with one of the control orifices of the fluidic element through a small diameter hole, the other control orifices of the fluidic element being adapted to operate in association with a throttle valve for supplying compressed air to the air motor so as to instantaneously open when the throttle valve opens and closes, thereby communicating with a communication passage leading to the control valve. The torque control apparatus according to the invention is characterized in that two outputs of the fluidic element are caused to communicate with the diaphragms on both sides of the main valve respectively, a second throttle valve being provided in a passage communicating with the input of the fluidic element.
대표청구항
▼
1. A pneumatic impact apparatus connected to a compressed air source, said apparatus comprising: a rotary air motor and means defining a first air passage connecting said air source and said motor; a torsion bar having a first and a second end and connected at said first end to said motor for rot
1. A pneumatic impact apparatus connected to a compressed air source, said apparatus comprising: a rotary air motor and means defining a first air passage connecting said air source and said motor; a torsion bar having a first and a second end and connected at said first end to said motor for rotation therewith, said torsion bar having an exhaust passage directed through the side thereof at one of said first and second ends; a spindle case having third and fourth ends surrounding said torsion bar and held at said third end to said torsion bar only at the other of said first and second ends for movement therewith, said fourth end of said spindle case being free for rotation with said other of said first and second ends of said torsion bar when a torque is applied to said first end of said torsion bar resisted by an external force at said second end, said spindle case having an exhaust passage opening to the atmosphere normally aligned with said exhaust passage of said torsion bar for allowing air to pass therethrough when said fourth end of said spindle case is rotating relative to said one of said first and second ends of said torsion bar out of alignment with said torsion bar; a two-position main valve, located in said first air passage, for controlling the air flowing to said motor from the air source, said main valve including first and second diaphrams responsive to air pressure applied thereto, for respectively opening and closing said main valve to respectively allow and block the flow of air to said motor; fluid control means, having a first inlet, first and second outlets and first and second control orifices, responsive to air pressure applied to said first and second control orifices for switching the flow of air entering said first inlet to said first and second outlets, respectively; said fluid control means having first and second pilot passages, said first and second outlets respectively communicating with said first and second diaphrams through said first and second pilot passages, respectively; throttling valve means, having a second inlet, a third outlet communicating with said exhaust passage of said torsion bar, and a fourth outlet communicating with said second control orifice of said fluid control means, for controlling the flow of air from said second inlet to said exhaust passage of said torsion bar and for reducing the air pressure at said second control orifice to less than the air pressure at said second inlet; control valve means, located in said first passage between said air source and said motor, for controlling air flow from the air source to said second inlet of said throttling means, said first inlet of said fluid control means, said first control orifice of said fluid control means and said motor, said control valve means having a third inlet in said first passage for communicating with the air source, a fifth outlet for communicating with said motor when said main valve is open, and a sixth outlet communicating with said first control orifice of said fluid control means, said control valve means being continuously moveable between first, second and third successively adjacent positions, said control valve means blocking communication between said third inlet and said fifth and sixth outlets in said first position, said fifth and sixth outlets communicating with said third inlet and with each other when said control valve means is in said second position, said third inlet communicating with said fifth outlet and said control valve means blocking communication between said fifth and sixth outlets and said third inlet, when said control valve means is in said third position said fifth outlet communicating with said second inlet of said throttling means and said first inlet of said fluid control means; whereby when said control valve means is moved from said first to said second position, air pressure is applied through said control valve means to said first inlet and said first orifice of said fluid control means to direct air from said first inlet through said first outlet to apply pressure to said first diaphram to open said main valve so as to allow airflow to said air motor to drive said motor to apply torque to said torsion bar and said spindle case; whereby when said control valve means is moved from said second position to said third position, air pressure to said first orifice of said fluid control means is cut off, airflow is directed through said throttling valve means to said torsion bar and through said exhaust passage, the air pressure at said second control orifice of said fluid control means being at a reduced value insufficient to switch the flow of air entering said first inlet of said fluid control means to said second outlet thereof so that air pressure on said first diaphram is maintained and said motor continues to be driven; and whereby if rotation of said torsion bar is blocked by an external force while said control valve means is in said third position, said fourth end of said spindle case is rotated relative to said one of said first and second ends of said torsion bar, whereby said exhaust passage of said spindle case is instantaneously closed so that airflow through said third outlet of said throttling valve means is interrupted so that air pressure at said second control orifice of said fluid control means is increased to switch the flow of air entering said first inlet of said fluid control means to said second outlet thereof, so that pressure to said second diaphram is applied to close said main valve to shut off said motor; return of said torsion bar to its normal position relative to said spindle case then opening said exhaust valve resulting in said main valve again opening to allow said motor to be driven by airflow from the air source. 2. A pneumatic impact apparatus as in claim 1, further comprising a dropping resistor for reducing the air pressure at said first inlet of said fluid control means, said fifth outlet of said control valve means communicating with said first inlet of said fluid control means through said dropping resistor. 3. A pneumatic impact apparatus as in claim 1, wherein said third end of said spindle case is held to said torsion bar for rotation therewith at said first end.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.