| 摘要 |
A utility knife has a handle generally defining a handle axis and a remote end provided with an opening. A carriage is slidably mounted within the handle for selective movements through the opening between a retracted position in which the carriage is substantially fully received within the handle and a fully extended position in which the carriage is fully extended through the opening to increase the effective length of said handle by a distanceΔl. A blade mounted on the carriage shares the movements of the carriage and has an operative portion that can fully penetrate a work to be cut when the handle axis is inclined at an angleαrelative to a surface of the work. A finger of a user most proximate to the work surface is positionable a distance h above the work surface during normal use of the utility knife,Δl andαbeing selected so that the distanceΔl is generally greater that 1.0 inch and the angleαis equal to at least 35°. |
