Chalk line
US7770300B2 · kind B2 · utility
23Cited by
4References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 2008 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Sep 17, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB44D3/38
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The chalk line comprises a housing that supports the spool having a string or line wound thereon in a chalk chamber. The transmission for rewinding the spool is located in a separate compartment. The chalk filled chamber is isolated from the transmission such that the components located in the chamber are the spool, line and chalk. A door for allowing access to the chamber is opened by manually operating a latch. A safety interlock is also provided such that the latch cannot be inadvertently unlocked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.