Spring lock spring line chalk box

Details Spring lock spring line chalk box Spring lock spring line chalk box

2005-10-25

2005-10-25

Smith, R. Alexander (Department: 2859)

Geometrical instruments

Straightedge type

Cord type

C033S413000

Reexamination Certificate

active

06957495

ABSTRACT:
An automatically retracting chalk line dispenser having a first and second casing elements, chalk line, reel, coil spring, and thumb-lever. The thumb-lever operates as a brake thereby allowing for either controlled retraction or an effective lock on the chalk line.

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