Multi-stranded return spring for fastening tool

摘要

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 driver. The driver then contacts the rotating flywheel to propel the driver, which compresses the return springs against the impact absorbers as the driver travels from the returned position to the extended position.

主权项

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; and wherein the driver compresses the return spring against the impact absorber as the driver travels from the returned position to the extended position.