IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0691377
(1985-01-15)
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발명자
/ 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
32 인용 특허 :
3 |
초록
▼
A pair of rotating flywheels which engage a ram for moving a tool which impacts a part, such as a nail to be driven, are rotated in opposite directions from a single motor or other rotating means, through a pair of substantially identical gears, one of which drives one flywheel and the other of whic
A pair of rotating flywheels which engage a ram for moving a tool which impacts a part, such as a nail to be driven, are rotated in opposite directions from a single motor or other rotating means, through a pair of substantially identical gears, one of which drives one flywheel and the other of which drives the other flywheel. The drive connection between the respective gears and each of the flywheels may include a belt and pulley arrangement, so that each flywheel may be driven directly by the respective belt but the flywheels are pivoted toward and away from the ram so that when the flywheel moves toward the corresponding side of the ram, the connection between the belt and the corresponding pulley will tend to slacken. A special flywheel pulley has an inner V-shaped groove and parallel side walls for guiding the belt into the groove when full tension occurs. A pair of sockets for receiving pivot pins for the respective flywheels are connected by a bar which is integral with a corresponding end plate and not only withstand precession forces but also tensile forces. A friction surface on the ram, particularly when the flywheel peripheries are polished steel, is a fabric layer of natural fiber, such as long fiber cotton cloth, impregnated by and molded in polyurethane, i.e. a natural fiber embedded in a medium hard plastic or rubber. A bumper has a pyramidal socket to engage a corresponding end of the ram on its return.
대표청구항
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1. An impact device comprising: A. a housing; B. a ram means mounted on said housing for reciprocating movement for delivering an impact to an object and returning to a rest position; C. ram moving means for moving said ram means from said rest position to impact an object and for accelerating
1. An impact device comprising: A. a housing; B. a ram means mounted on said housing for reciprocating movement for delivering an impact to an object and returning to a rest position; C. ram moving means for moving said ram means from said rest position to impact an object and for accelerating said ram means to a desired impact velocity, said ram moving means including: (1) two flywheels pivotably mounted on said housing adjacent to aaid ram means for movement from ready positions spaced from said ram means toward each other and into abutting contact with said ram means, (2) flywheel moving means for moving said flywheels from said ready positions toward each other and into abutting contact with said ram means and away from each other back to said ready positions, said flywheel moving means including (a) a workpiece engaging means for moving said flywheels toward each other and into abutting contact with said ram upon engaging a workpiece and (b) flywheel return means on said housing for biasing said flywheels away from each other and toward said ready positions and moving said flywheels back to said ready positions when said workpiece engaging means is not engaging a workpiece; and (3) flywheel rotating means for rotating each of said flywheels in a direction to drive said ram means toward an impact delivering position upon engagement with said ram means, said flywheel rotating means including (a) a motor having a drive shaft, (b) a first pulley means associated with each flywheel and rotatably mounted on aaid housing, each of said first pulley means including a V-shaped peripheral groove, (c) coupling means for coupling each of said first pulley means together to rotate together but in opposite directions, (d) connecting means mounted on said housing for connecting said motor to one of said first pulley means for rotating said first pulley means, (e) a second pulley means connected to each flywheel and rotatably mounted on said housing, (f) a V-shaped belt means for connecting each of said second pulley means to an associated one of said first pulley means to rotate said second pulley means in correspondence with rotation of said associated first pulley means, (g) each of said second pulley means including a compound groove means extending from an inner portion of each of said second pulley means to the outer peripheral edge of said second pulley means for accommodating said belt means, said compound groove means including a V-shaped portion which is located adjacent to the inner portion of said second pulley means and which is sized and shaped to receive said V-shaped belt means snugly enough so that movement of said belt means is transferred to said second pulley means, said V-shaped portion being located to snugly receive said belt means when said flywheels are in said ready positions whereby rotation of said motor drive shaft is transmitted to said flywheels to rotate said flywheels at a predetermined speed, said flywheel return means biasing said second pulley means V-shaped groove portions against said V-shaped belt means when said flywheels are in said ready positions, and a second portion having side walls which are spaced apart far enough so said second pulley means is disconnected from said belt means when said second pulley means is positioned to have said belt means located in said groove means second portion whereby said flywheels are disconnected from said motor when said belt means is located in said groove second portion and rotate under their own inertia for driving said ram means, said groove means second portion being placed on said second pulley means to have said belt means positioned therein after said flywheels have been moved out of said ready positions and have been moved toward each other by said flywheel moving means. 2. In an impact device, as defined in claim 1 wherein: the side of said ram means engagable by said flywheels is provided with a surface formed by a natural fiber embedded in a medium hard plastic or rubber. 3. In an impact device as defined in claim 2, including: a surface formed by a natural fiber embedded in a plastic on each side of said ram means. 4. In an impact device as defined in claim 3, wherein: said ram is provided with a lower axial socket and a central hole extending from said socket to the opposite end of said ram; and said tool means is provided with an enlargement receivable in said lower socket, a rod extendable through said central hole and means for securing the opposite end of said rod to said ram. 5. In an impact device as defined in claim 4, wherein: said ram is formed of layers of woven natural fiber embedded in a plastic; each edge of said ram is provided with a longitudinal groove and an aperture extends through said ram at position to intersect said socket, whereby a resilient cord for returning said ram after an impact may extend through said aperture and around a portion of said tool means in said socket, said resilient cord thereby extending along each said groove to a normal position adjacent the opposite end of said ram; and said device having means at said normal position for attachment of said cord. 6. In an impact device as defined in claim 3, wherein: said ram is provided with a central metal core which extends from one end toward the opposite end, the portion of said core at said one end being provided with means for attachment of said tool means and spaced fingers extending in said ram toward said opposite end; and said fingers being embedded in a plastic and the sides of said ram on opposite sides of said core being formed of layers of woven natural fiber embedded in said plastic. 7. In an impact device as defined in claim 6, wherein: each edge of said ram means is provided with a longitudinal groove and an aperture extends through said ram means adjacent to one end thereof, whereby a resilient cord for returning said ram means after an impact may extend through said aperture adjacent to one end of said ram means, said resilient cord thereby extending along said groove to a normal position adjacent to an opposite end of said ram means; and means at a normal position for attachment of said cord. 8. In an impact device as defined in claim 2, wherein: said natural fiber is long fiber cotton and said plastic is polyurethane. 9. In the impact device as defined in claim 1 wherein: said ram means is provided with a pyramidal end; and a bumper formed of resilient material and having a socket corresponding in shape to an end of said ram means mounted in a position whereby said pyramidal end of said ram means engages said socket upon return of said ram means from an impact stroke. 10. In an impact device as defined in claim 9, wherein: said bumper is provided with a groove at each end of said socket for receiving the ends of a resilient cord for returning said ram from an impact stroke. 11. In an impact device as defined in claim 10, wherein: said tool means is adapted to drive a series of objects into an article; said device is provided with a nose piece engageable with said article; said nose piece is provided with a bumper engageable by the end of said ram means adjacent to said tool means in the event said ram means is moved further than a normal stroke when said tool means is driving an object into said article, said bumper being formed of resilient material and having an aperture through which said tool means moves and an outwardly inclined surface extending from said aperture in the direction of movement of said tool; and clamping means for mounting said bumper on said nose piece, said clamping means being provided with a projection having slanting surfaces adapted to abut said inclined surfaces of said bumper and an aperture corresponding to said aperture of said bumper, said clamping means being formed of less resilient material than said bumper. 12. In an impact device as defined in claim 1, wherein: each said flywheel is provided with a polished metal peripery; and each side of said ram is provided with a surface formed by a woven natural fiber embedded in a plastic. 13. In an impact device of claim 1 wherein said belt means includes: a compliant transmission means coupling said each of second pulley means means to an associated flywheel, said compliant transmission means being operative to alter the relative rotation between said second pulley means and said flywheel upon the engagement of said ram means against said flywheel. 14. In the impact device defined in claim 1 including ram means returning means which comprises elastic cord means extending and attached to said ram means from a position spaced longitudinally from said ram means opposite the direction of movement of said ram means when driven by said flywheels; cord attaching means removably mounted on said housing at said position; cap means removably mounted on said housing to hold said cord attaching means on said housing, said cord and said ram means being mounted on said cord attaching means for permitting the removal of said cord attaching means, said cord means and said ram means as a unit when replacement of either said ram means or said cord means is desired. 15. In an impact device as defined in claim 14, wherein: said cord attaching means includes a plate provided with an aperture through which the end of said ram means may move for engagement with said burners; and said bumper is readily movable, whereby said plate, cord means and ram means may be removed and replaced as a unit upon removal of said bumper. 16. In an impact device as defined in claim 14 further including a pyramidal shaped socket in said cap means for receiving and accomodating the top end of said ram means. 17. In the impact device defined in claim 14 further including: means within said housing for supporting said ram means and said ram returning means within said impact device, said supporting means, said ram means and said ram returning means being removable from said impact device as a single unit. 18. The improvement recited in claim 17 wherein: said ram returning means comprises an elastic cord means affixed to said ram means. 19. The improvement recited in claim 18 wherein: said elastic cord means is further affixed to said supporting means.
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