Chalk line marking system

Details Chalk line marking system Chalk line marking system

2011-03-29

2011-03-29

Johnson, Amy Cohen (Department: 2841)

Geometrical instruments

Straightedge type

Cord type

C033S758000, C033S0010LE

Reexamination Certificate

active

07913409

ABSTRACT:
A chalk line is marked by attaching two hooks to a nail, and then extending a string a length from the nail. The hooks are attached to an apparatus that has multiple springs, such that there is a string attached to the rear of the apparatus while the hooks are attached to the front of the apparatus. When the string has been extended the desired length, the user then snaps the line to make a chalk line. Then, the pull on the string is released by the user, causing the two hooks to separate. When the two hooks separate, their connection to the nail is broken. The hooks and the apparatus associated with the hooks then is free to be reeled back to the user. The user does not have to return to the nail to remove the hooks and the associated apparatus.

REFERENCES:
patent: 2513256 (1950-06-01), Sonnenburg
patent: 2549287 (1951-04-01), Brennan
patent: 5937532 (1999-08-01), Eirich et al.
patent: 6705018 (2004-03-01), Guhse
patent: 7200949 (2007-04-01), Leslie et al.
patent: 7594336 (2009-09-01), Spaulding
patent: 7676941 (2010-03-01), Cruz et al.
patent: 2002/0026723 (2002-03-01), Savalla

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