[특허]Multi-stranded return spring for fastening tool

BLACK & DECKER INC.

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특허 상세정보

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Multi-stranded return spring for fastening tool

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B25C-001/06 B25C-005/15 B25C-005/00
출원번호	US-0796648 (2013-03-12)
등록번호	US-9216502 (2015-12-22)
발명자 / 주소	Brendel, Lee Michael Gross, Paul G.
출원인 / 주소	BLACK & DECKER INC.
대리인 / 주소	Harness, Dickey & Pierce, P.L.C.
인용정보	피인용 횟수 : 2 인용 특허 : 55

초록
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Compression return springs can be mounted on rails between the driver and an impact absorber. The springs include a plurality of wires twisted together to form a multi-stranded twisted wire member, which forms the coils of the spring. The springs can have an inner diameter that resists movement of the coils along the rails when the spring is at its free length, but has a mounted inner diameter that freely allows such movement. The coil-to-coil pitch of the spring can vary along its length. A motor initially rotates the flywheel without engaging the drive...

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1. A fastener driving tool comprising: a driver having a returned position and an extended position;a compression return spring being disposed between the driver and an impact absorber to bias the driver into the returned position, the compression return spring comprising a plurality of wires twisted together forming a multi-stranded twisted wire member, the multi-stranded twisted wire member forming a plurality of coils of the compression return spring;a motor in driving engagement with a flywheel to rotate the flywheel without engaging the driver;wherein the driver is configured to contact the rotating flywheel to propel the driver from the returned position to the extended position; andwherein the driver compresses the return spring against the impact absorber as the driver travels from the returned position to the extended position. 2. The fastener driving tool of claim 1, wherein the multi-stranded twisted wire member comprises at least three wires. 3. The fastener driving tool of claim 1, wherein the multi-stranded twisted wire member comprises a lay of between about 4 mm and about 7 mm. 4. The fastener driving tool of claim 1, wherein the impact absorber comprises a closed celled foam. 5. The fastener driving tool of claim 1, wherein the impact absorber comprises an open celled foam. 6. The fastener driving tool of claim 5, wherein the impact absorber further comprises an isolation member interposed between an end of the compression return spring member and the impact absorber. 7. The fastener driving tool of claim 1, wherein the compression return spring has a first coil-to-coil pitch adjacent an end that is smaller than a second coil-to-coil pitch adjacent an opposite end of the compression return spring. 8. A fastener driving tool comprising: a rail having an outer periphery at an outer rail diameter;a driver mounted on the rail and movable along the rail between a returned position and an extended position;an impact absorber mounted on the rail;a compression return spring mounted on the rail disposed between the driver and the impact absorber to bias the driver into the returned position, the compression return spring comprising a plurality of wires twisted together forming a multi-stranded twisted wire member, the multi-stranded twisted wire member forming a plurality of coils of the compression return spring, the coils having a free length inner diameter that is essentially equal to the outer rail diameter causing the coils to resist moving axially along the rail, and having a mounted length inner diameter providing clearance between the inner diameter of the coils and the outer diameter of the rail to allow the coils to freely move axially along the rail as the driver moves between the return and extended positions; anda motor in driving engagement with a flywheel to rotate the flywheel without engaging the driver;wherein the driver and the rotating flywheel are configured to engage each other to propel the driver from the returned position to the extended position; andwherein the driver compresses the return spring against the impact absorber as the driver travels from the returned position to the extended position. 9. The fastener driving tool of claim 8, wherein the multi-stranded twisted wire member comprises at least three wires. 10. The fastener driving tool of claim 8, wherein the impact absorber comprises a closed celled foam. 11. The fastener driving tool of claim 8, wherein the impact absorber comprises an open celled foam. 12. The fastener driving tool of claim 11, wherein the impact absorber further comprises an isolation member interposed between an end of the compression return spring member and the impact absorber. 13. The fastener driving tool of claim 8, wherein the compression return spring has a first coil-to-coil pitch adjacent an end that is smaller than a second coil-to-coil pitch adjacent an opposite end of the compression return spring. 14. A fastener driving tool comprising: a frame defining a rotational axis and a driver axis;a motor coupled to the frame;a flywheel rotatably driven by the motor about the rotational axis;a pair of rails extending parallel to the driver axis, the rails being disposed on opposite sides of the flywheel;a driver mounted on the rails to be movable along the driver axis between a returned position and an extended position;a pair of impact absorbers, each of the impact absorbers being mounted coaxially on an associated one of the rails;a pair of springs, each of the springs being received over a corresponding one of the rails disposed between the driver and a corresponding one of the impact absorbers, the springs cooperating to bias the driver into the returned position, each of the springs comprising a plurality of wires twisted together forming a multi-stranded twisted wire member, the multi-stranded twisted wire member forming a plurality of coils of the spring;wherein the driver is configured to contact the rotating flywheel to propel the driver from the returned position to the extended position; andwherein the driver compresses the return spring against the impact absorber as the driver travels from the returned position to the extended position. 15. The fastener driving tool of claim 14, wherein a follower is coupled to the frame and movable between a first position, in which the follower drives the driver into engagement with the flywheel to transfer energy from the flywheel to the driver to propel the driver relative to the flywheel along the driver axis, and a second position in which the follower, the driver and the flywheel are not engaged to one another. 16. The fastener driving tool of claim 14, wherein the coils have a free length inner diameter that is essentially equal to the outer rail diameter causing the coils to resist moving axially along the rail, and having a mounted length inner diameter providing clearance between the inner diameter of the coils and the outer diameter of the rail to allow the coils to freely move axially along the rail as the driver moves between the return and extended positions. 17. The fastener driving tool of claim 14, wherein the multi-stranded twisted wire member comprises at least three wires. 18. The fastener driving tool of claim 14, wherein the impact absorber comprises a closed celled foam member. 19. The fastener driving tool of claim 14, wherein the impact absorber comprises an open celled foam member. 20. The fastener driving tool of claim 19, wherein the impact absorber further comprises an isolation member mounted on the rail and interposed between an end of the compression return spring member and the impact absorber. 21. The fastener driving tool of claim 14, wherein the compression return spring has a first coil-to-coil pitch adjacent an end that is smaller than a second coil-to-coil pitch adjacent an opposite end of the compression return spring.

이 특허에 인용된 특허 (55)

이 특허를 인용한 특허 피인용횟수: 2

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Multi-stranded return spring for fastening tool

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Multi-stranded return spring for fastening tool

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이 특허에 인용된 특허 (55)

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