| 摘要 |
A thimble 10, Fig. 1, for the eye of a rope 2, has sleeve 40, which receives shackle pin 32, and a bar 42 attaching this sleeve to the inside thimble wall. The load in the bar is recorded by means of a mechanical strain recorder whose scribe 56 on bar arm 54 marks on a recording surface 52. Bar 42 may be omitted, and the sleeve attached to the large thimble and by spring beams (60), the strain recorder then bridging the gap between the thimble small end and the sleeve (Fig. 3). Sleeve 40 may be omitted, Fig. 6, the thimble having slot 70 bridged by the strain recorder. Mark-recording surface 80 is intermittently rotated, and is removable. The slot may have an inserted bar (78, Fig. 6A) as a pivot for relative movement of thimble parts, or may not extend through the thimble. Electronic strain gauges may be used. <IMAGE> |
