摘要
目的建立在犯罪现场辨别剪切防盗网工具是直柄式断线钳还是液压式断线钳的快捷方法。方法在净距40-110 mm的8种防盗网上,选取3种不同规格的直柄式断线钳及1种常用的液压式断线钳,分别进行最大角度的剪切,观察并分析所形成的立顶和防盗网面之间的角度。结果在上述8种净距的防盗网上,直柄式断线钳所形成的立顶和防盗网面之间角度范围是30°-150°,液压式断线钳所形成的立顶和防盗网面之间角度范围是0°-75°或105°-80°。结论除了形成的立顶和防盗网面间的角度范围重叠部分外,直柄式断线钳所形成的特征角度范围是75°-105°,液压式断线钳所形成的特征角度范围是0°-30°和150°-180°。该方法可用于快速鉴别断线钳种类。
Objective To establish a rapid method of distinguishing straight handle bolt cutter from hydraulic bolt cutter by the cut burglarproof grid at crime scenes. Methods One type of hydraulic bolt cutter and three different types of straight handle bolt cutter with respective length of 450, 600, 1050 mm were employed as experimental tools. Eight various types of burglarproof grids were simulated using steel bars on the ground. The distances between bars were 110, 100, 90, 80, 70, 60, 50 and 40mm, respectively. The tools were used to cut burglarproof grids under some limited conditions, and the cut created a plane on the top of the cutting surface of the steel bar. The angle between the top plane on the cutting surface and burglar-proof grid was measured and analyzed. Results On the burglarproof grids with eight different spacing distance, the angles created by straight handle bolt cutter were measured in a range of 30°-150°, meanwhile, the angles created by hydraulic bolt cutter ranged from 0° to 75° or 105° to 180°. Conclusions Except for the overlapped range of angle created, the rest has distinguishing characteristics which can be utilized to differentiate the two types of bolt cutters. According to the angle between the top plane on the cutting surface and burglarproof grid found at the crime scene, 75°-105° indicates the related tool as a straight handle bolt cutter, while 0°-30°or 150°-180° indicates a hydraulic one. Hence, the angle between the top plane on cutting surface and burglarproof grid can be an effective index to differentiate straight handle bolt cutter from the hydraulic one.
出处
《刑事技术》
2015年第4期263-265,共3页
Forensic Science and Technology
关键词
工具痕迹
防盗网
直柄式断线钳
液压式断线钳
立顶
toolmarks
burglarproof grid
straight handle bolt cutter
hydraulic bolt cutter
top plane on the cutting surface
