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    • 1. 发明授权
    • Method of making a standard tool for calibrating stress analysis measuring devices and a set of the standard tools
    • 制造用于校准应力分析测量装置的标准工具的方法和一套标准工具
    • US07236241B2
    • 2007-06-26
    • US10907344
    • 2005-03-30
    • Mary Ann JohnsonDavid W. Johnston
    • Mary Ann JohnsonDavid W. Johnston
    • G01J1/10G01B11/16
    • G01N21/23G01N21/278
    • A method of making a standard tool for calibrating polarimeters that analyze stress in photoelastic material, includes the steps of partially annealing a starting piece of tempered glass so that the starting piece has a retardance below 250 nm/cm, removing a peripheral portion of the starting piece (preferably, at least about 20% of its radial dimension) to leave a working piece, cutting a rectangular parallelepiped from the working piece, polishing two opposing faces of the rectangular parallelepiped where the two opposing faces are spaced apart by a measurement distance through which light passes during stress analysis in a polarimeter, and determining a birefringence of the rectangular parallelepiped across the measurement distance using a calibrated polarimeter. The standard tool is the rectangular parallelepiped having the determined birefringence for the measurement distance. The method can be used to make a set of the standard tools with different measurement distances.
    • 制造用于校准光弹性材料中的应力的偏振计的标准工具的方法包括以下步骤:对起始钢化玻璃进行部分退火,使起始部件具有低于250nm / cm的延迟,去除起始部分的周边部分 (优选地,其径向尺寸的至少约20%)以离开工件,从工件切下长方体,抛光长方体的两个相对的面,其中两个相对面间隔开测量距离通过 哪个光在偏振计的应力分析过程中通过,并且使用校准的偏振计确定整个测量距离上的长方体的双折射。 标准工具是具有测量距离的确定的双折射的长方体。 该方法可用于制作具有不同测量距离的一组标准工具。
    • 3. 发明授权
    • Grass trimmer cutting line
    • 剪草切割线
    • US06842984B1
    • 2005-01-18
    • US09706844
    • 2000-11-07
    • Mary Ann Johnson
    • Richard O. Grant
    • A01D34/416B26B7/00A01D34/00B26B9/00
    • A01D34/4168
    • A spooless trimmer head which utilizes finite lengths of trimmer line inserted through apertures in the trimmer head housing. The lines are thick, strong, long lasting and easily replaced when worn. One end of each line extends from the trimmer head to rotate and cut vegetation. The line includes a collar having a flange formed on an opposite end to retain a distal end of the line in the trimmer head housing. The line is crimped to the collar approximately ⅓ the distance from the collar to the distal end of the line. The crimping location in combination with the position of the flange of the collar reduce the stress and strain on the trimmer line and enhance the longevity of the line.
    • 一种无后置修剪器头,其利用经过修剪器头壳体中的孔插入的有限长度的修剪线。 线条厚实,坚固,持久耐用,佩戴时易于更换。 每条线的一端从修剪头延伸以旋转和切割植被。 线包括具有形成在相对端上的凸缘的套环,以将线的远端保持在修剪器头壳体中。 该线被卷曲到衣领大约距离衣领到线的远端的距离的1/3。 压接位置与套环法兰的位置相结合,减轻了修剪线上的应力和应变,增强了线的使用寿命。