| 摘要 |
An anti-kickback device for preventing kickback of a chain saw comprises, in one embodiment, a platelike member attached to the guide bar nose section and having the general configuration of a circular sector which extends arcuately over a predetermined sector of the nose section and extends radially outwardly therefrom a distance greater than the farthest radial extent of the saw chain during its travel over the nose section to prevent the chain from being brought into contact with any object in the region where it runs over the nose section thereby preventing kickback which could otherwise occur. The platelike member may terminate in an inturned lip which is turned inwardly towards the guide bar so as to substantially enclose the saw chain during its travel over the nose section. The device may be permanently or removably attached to the guide bar. In another embodiment, two complementary platelike members are attached to opposite sides of the guide bar and each member may terminate in an inturned lip which is turned inwardly towards the other so as to enclose the saw chain during its traversal over the nose section. The two platelike members may be permanently or removably attached to the guide bar. In guide bars of laminated construction, the anti-kickback device can be formed as extensions of the guide bar outer side plates and this construction can be used whether the anti-kickback device is composed of one or two platelike members. |
