| 摘要 |
FIELD: machine building. ^ SUBSTANCE: here is disclosed tool bracing reinforcing rods by twisting opposite end sections. The bracing tool consists of a driving shaft driven to rotation with an electric motor positioned in a case, and of a hammer supported on the driving shaft and designed to travel in axial direction of the driving shaft and to rotate around the axis of the driving shaft. Further, the bracing tool consists of an anvil, supported on the driving shaft and rotating relative to the driving shaft around axis, and of a rotary impact device moving the hammer forward, withdrawing it in axial direction relative to the anvil and striking the anvil in the direction of rotation. The bracing tool consists of a hook-like bracing tip mounted on the anvil. In the first version to brace items opposite ends of the bracing element become twisted one with another at items bracing when the anvil rotates under effect of cyclic strikes in the direction of rotation, while the bracing tip is engaged with opposite ends of the bracing element. In the second version the bracing tool contains a device for spindle arresting. The device is equipped with a hooking element. The hooking element arrests a section of the spindle preventing rotation relative to the case of the bracing tool and releases this section. Also the section receiving a strike can rotate in the direction of rotation, when the hammer strikes the strike receiving section. In the third version the bracing tool contains a spindle arresting device equipped with a ring positioned inside the case and fixed in one position relative to the case in the direction of spindle rotation. The spindle arresting device contains at least one rolling element positioned between the ring and the anvil. Additionally, the spindle arresting device contains at least one space receiving the rolling element and formed between the ring and the anvil. This space has central section and opposite end sections in a circumferential direction. Also length of the central section in a radial direction relative to the axis of spindle rotation is bigger, than diametre of the rolling element, while length of the opposite end sections in a radial direction is less, than diametre of the rolling element. ^ EFFECT: raised efficiency of device. ^ 10 cl, 12 dwg |
