Device for showing tensile stress
US7302859B2 · kind B2 · utility
7Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2003 |
| Grant date | Dec 4, 2007 |
| Priority date | — |
| Expiry date | Aug 31, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD07B1/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In this device for indicating (10) pretensioning forces in a tensioning element (7), such as tie-down straps or tie-down ropes, the spring surrounds the tie bolt (3) which is located on the loop of the tie-down strap, and in response to weak forces describes a path (6) which is easily visible. The combination of two components which differ in shape allows the spring (1) to maintain its shape and spring constant. As a result, the pretensioning force is indicated directly, yet the spring is not subject to an additional load under high tensions but is protected by positive engagement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.