초록 ▼

It is an object of the invention to provide an effective technique for achieving a smooth driving operation with a driving power tool for driving a driving material into a workpiece. A representative driving power tool for driving a driving material into a workpiece is provided with a coil spring, a

It is an object of the invention to provide an effective technique for achieving a smooth driving operation with a driving power tool for driving a driving material into a workpiece. A representative driving power tool for driving a driving material into a workpiece is provided with a coil spring, an operating member. The power tool fixer includes a rotating element that rotates in a normal direction it the spring force of the coil spring as the drive member drives the coil spring, an outer edge of the rotating element, an engaging member and a lock avoiding mechanism. The outer edge includes a first outer edge portion and a second outer edge portion, a first vertical wall and a second vertical wall. The engaging member defines a working stroke of the driving operation. The lock avoiding mechanism avoids the engaging member from being locked to the second vertical wall by the spring force of the coil spring being transmitted to the engaging member via the second vertical wall in the process in which the engaging member moves inward in the radial direction of the rotating element toward the second outer edge portion via the second vertical wall.

대표청구항 ▼

I claim: 1. A driving power tool for driving a driving material into a workpiece, comprising: a coil spring that builds up a spring force, an operating member that is mounted on the end of the coil spring and linearly operates by free extension of the coil spring having the built-up spring force an

I claim: 1. A driving power tool for driving a driving material into a workpiece, comprising: a coil spring that builds up a spring force, an operating member that is mounted on the end of the coil spring and linearly operates by free extension of the coil spring having the built-up spring force and thereby applies a driving force to the driving material, a drive member that drives the coil spring and thereby builds up the spring force on the coil spring, a rotating element that rotates in a normal direction against the spring force of the coil spring as the drive member drives the coil spring, an outer edge of the rotating element, including (i) a first outer edge portion extending along at least a portion of the circumferential direction of the rotating element, the first extending edge extending at a first distance from the center of rotation of the rotating element, and (ii) a second outer edge portion extending contiguously to the first outer edge portion along the circumferential direction of the rotating element, the second outer edge extending at a second distance shorter than the first distance, a first vertical wall formed at the circumferential direction of the rotating element, the first vertical wall formed between a front end region of the first outer edge portion and a rear end region of the second outer edge portion so as to at least partially transition the circumferential direction of the rotating element from the first outer edge portion to the second outer edge portion, a second vertical wall formed at the circumferential direction of the rotating element, the second vertical wall formed between a rear end region of the first outer edge portion and a front end region of the second outer edge portion, in the normal direction of rotation of the rotating element, so as to at least partially transition the circumferential direction of the rotating element from the first outer edge portion to the second outer edge portion, an engaging member that moves outward in the radial direction of the rotating element toward the first outer edge portion, the engaging member at least partially transitioning from the second outer edge to the first outer edge at the first vertical wall, the engaging member able to slide alone the first outer edge portion and thereafter moves inward in the radial direction of the rotating element and at least partially transition toward the second outer edge portion at the second vertical wall, the engaging member then returning back to the state of engagement with the second outer edge portion, as the rotating element rotates in the normal direction when the coil spring is driven by the drive member, whereby the engaging member defines a working stroke of the driving operation, a lock avoiding mechanism that avoids the engaging member from being locked to the second vertical wall by the spring force of the coil spring being transmitted to the engaging member via the second vertical wall in the process in which the engaging member moves inward in the radial direction of the rotating element toward the second outer edge portion the second vertical wall, a gear that is connected to the rotating element via the lock avoiding mechanism and inputs driving torque to the lock avoiding mechanism as the coil spring is driven by the drive member, wherein the lock avoiding mechanism allows relative rotation between the gear and the rotating element and includes an engagement pin provided on one of the gear and the rotating element, an engagement groove provided on the other of the gear and the rotating element and extending in an elongated manner along the direction of relative rotation between the gear and the rotating element to vary the position of the relative rotation between the gear and the rotating element, and a locking part to lock the engagement pin within the engagement groove. 2. The driving power tool as defined in claim 1, wherein, when the drive member is driven, the driving torque of the gear is transmitted to the rotating element via the engagement pin locked by the locking part, and the rotating element rotates together with the gear in the normal direction, while, when the drive member is stopped, the transmission of the driving torque of the gear to the rotating element is stopped and the locking of the engagement pin by the locking part is released, whereby the engagement pin is allowed to move within the engagement groove. 3. The driving power tool as defined in claim 2, wherein: the rotating element has a surface formed and configured in a circular arc portion in the rear end region of the first outer edge portion such that the distance from the center of rotation of the rotating element to said surface gradually increases with respect to the reverse direction of rotation of the rotating element, and the surface converts a pressing force acting upon said surface into a force of rotation of the rotating element in the reverse direction, thereby holding the engagement pin locked by the locking part such that the rotating element is kept rotating together with the gear in the normal direction. 4. The driving power tool as defined in claim 1, wherein the lock avoiding mechanism comprises a pivot arm rotatably provided in an end region of the engaging member to face the rotating element such that the arm swings to project in the normal direction from the end region of the engaging member. 5. The driving power tool as defined in claim 1, wherein the power tool is defined as a nailing machine or a tucker.