Cam pawl actuator |
|||||||
| 申请号 | US32179573 | 申请日 | 1973-01-08 | 公开(公告)号 | US3828617A | 公开(公告)日 | 1974-08-13 |
| 申请人 | LE BLANC L; | 发明人 | LE BLANC L; | ||||
| 摘要 | A rifle bar rotation mechanism for a pneumatic drill wherein remote control of rotation modes is accomplished by rotation of a cam element to control the engagement of pawl elements with a toothed ratchet member. | ||||||
| 权利要求 | 1. A rifle bar rotation mechanism for a rock drill comprising: an axially extending elongated body member; an axially extending bore in said body member; an elongated rifle bar having a longitudinally extending bore therethrough and having one end portion thereof rotatably mounted within said body member bore; first means received within said body member bore and cooperable with second means on said one end portion for selectively controlling the rotation of said rifle bar; a hollow cam member rotatably coaxially received within said body member bore; said cam member having a peripheral camming surface thereof for controlling the cooperation of said first and second members; first rotative means being in radial driving engagement with said cam member and adapted to be responsive to pressure fluid supplied thereto to rotate said cam member coaxially with respect to the longitudinal axis of said bore; second rotative means having a portion thereof coaxially aligned with said cam member and in driving engagement therewith; and having at least another portion thereof located externally of said body member and being manually operable to rotate said cam member coaxially with respect to the longitudinal axis of said bore; and said first and second rotative means being selectively operable independently of each other. 2. A rifle bar rotation mechanism as specified in claim 1 wherein said body member includes a back head element having therein a rearward portion of said body member bore and said cam member is received within said rearward portion. 3. A rifle bar rotation mechanism as specified in claim 2 wherein said first means comprises a plurality of pawl elements pivotally mounted within said body member bore forwardly of said back head, and said second means comprises ratchet teeth on a head element forming said one end portion of said rifle bar. 4. A rifle bar rotation mechanism as specified in claim 3 wherein said pawl elements are tangentially engagable with said ratchet teeth, some of said pawl elements thus engagable to prevent rotation of said rifle bar in one direction of rotation and at least one other of said pawl elements thus engagable to prevent rotation of said rifle bar in the opposite direction. 5. A rifle bar rotation mechanism as specified in claim 2 wherein said back head has a cross bore therein peripherally intersecting said rearward portion of said body bore and said first rotative means comprises a double acting piston slidably received in said cross bore and engaging said cam member. 6. A rifle bar rotation mechanism as specified in claim 5 wherein end portions of said cross bore are adapted to be in communication with a source of pressure fluid. 7. A rifle bar rotation mechanism as specified in claim 6 wherein said communication of one of said cross bore end portions with a source of pressure fluid is simultaneous with communication of the other of said cross bore end portions with the ambient atmosphere. 8. A rifle bar rotation mechanism as specified in claim 2 wherein said backhead is provided with a passageway providing said adaptation for communication of said interior of said back head with such a source of pressure fluid. 9. A rifle bar rotation mechanism as specified in claim 8 wherein a blow tube is slidably received in said rifle bar bore to provide communication of said cam member interior through said rifle bar bore. 10. A rifle bar rotation mechanism as specified in claim 9 wherein said cam member interior is a through bore therein sealingly receiviNg a head portion of said blow tube and having a side opening communicating with said back head passageway. |
||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈