Geometrical instruments – Straightedge type – Cord type
Patent
1994-03-01
1995-08-29
Will, Thomas B.
Geometrical instruments
Straightedge type
Cord type
33393, 33339, 2423908, B44D 338
Patent
active
054449197
ABSTRACT:
A battery powered chalk line comprising a housing having a top and bottom face and side walls forming a chamber therein. A drive shaft is secured within the side walls for rotational movement and extends across the width of the chamber. A spindle is mounted on the shaft and is selectively couplable for rotation therewith. A chalk line is mounted on the spindle for being dispensed and retrieved with the rotation of the shaft. The chalk line extends through an aperture in the front end of the housing with a hook secured to the exterior end of the line. A cavity in the chamber adjacent to its front end in proximity to the aperture for coating the line with chalk powder as the line passes therethrough. A driven bevel gear forms with the spindle for rotation therewith. A motor with an output shaft with drive bevel gear secures thereto for rotation to rotate the spindle to reel in the line. Batteries within the chamber couple the motor with a switch to activate and inactivate the motor. A handle is mounted to one end of the drive shaft exterior of the housing. The handle is movable to a first position locked with respect to the housing to allow rotation of the spindle through the motor independent of the drive shaft for the automatically reeling in the line and is movable to an operative position to couple the drive shaft with the spindle for manually reeling in the line.
REFERENCES:
patent: 3311319 (1967-03-01), Campbell
patent: 3438595 (1969-04-01), Brown et al.
patent: 3568322 (1971-03-01), Showers
patent: 3784125 (1974-01-01), Law et al.
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patent: 4272036 (1981-06-01), Watermann
patent: 4697349 (1987-10-01), Lee
patent: 4773162 (1988-09-01), Lin
patent: 4813145 (1989-03-01), Josey, Jr. et al.
patent: 5014437 (1991-05-01), Sun
patent: 5212875 (1993-05-01), Corso
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