![]() The present invention further relates to reels which fully retract and protect flexible plumb bob lines. The present invention broadly relates to tools used in the construction and surveying industries and, more specifically, to reels for use in combination with plumb bobs. The invention according to claim 1 wherein said means for attaching said reel to a penetrable object comprises:Ī) a hole formed longitudinally through said reel housing adjacent and parallel to said top planar member andī) an elongated staked member extending through said hole. The invention according to claim 1 wherein said knobbed member is positioned adjacent said bottom planar member and includes one edge positioned in vertically aligned relation above said aperture.ģ. An improved plumb bob reel of the type including a housing having first and second opposed, planar walls held in spaced, parallel relation to one another by longitudinally elongated bottom, top and two side planar members, said bottom and top planar members, and said two side planar members respectively extending in parallel relation to one another a spool rotatably positioned within said housing a predetermined length of flexible line for extension from and wound retraction upon said spool an aperture formed substantially centrally through said bottom planar member, said flexible line freely passing through said aperture for purposes of becoming suspended in vertical alignment above a predetermined datum and a spring retraction mechanism positioned within said housing for retracting said line upon said spool, wherein the improvements comprise:Ī) first and second longitudinally elongated magnets respectively, removably attachable to said two side planar members wherein said first and second magnets permit removable attachment of said reel to any ferrous object ī) first, second, and third elongated channels respectively formed in said first and second magnets and said top planar member, said first, second, and third channels extending in longitudinal relation with respect to said longitudinal axis of said first and second magnets and said top planar member and extending in longitudinally aligned relation to each other, whereby said flexible line may be guided through said channel and suspended in vertically aligned relation above said predetermined datum Ĭ) said spool including first and second plates held in spaced, parallel relation by a drum, said first and second plates each having respective, distinct widths, wherein said first plate's width is substantially greater than said second plates' width ĭ) said spring retraction mechanism having first and second ends and being coiled externally upon said first plate of said spool Į) a knobbed member extending outwardly from one of said first and second planar walls, whereby said flexible line may be wrapped around said knobbed member and suspended in vertically aligned relation above said predetermined datum andį) means for attaching said reel to a penetrable object.Ģ. Ĭhalk lines and plumb-bobs are often sold as a single tool.1. ![]() The primary problems associated with improper maintenance of a chalk line are string breakage due to excessive tension on the line, and degradation of the line associated with moisture contamination. Chalk lines can also be used across irregular surfaces and surfaces with holes in them, for example on an unfinished stud wall. The objects to be marked do not need to be continuous along the line. However, as long as the line is taut and the two ends of the chalk line are in nearly the same plane, the chalk line will mark all points that the string touches on or near that plane once snapped. Next, the string is then plucked or snapped sharply, causing the string to strike the surface, which then transfers its chalk to the surface along that straight line where it struck.Ĭhalk lines are typically used to mark relatively flat surfaces. The string is then laid across the surface to be marked and pulled tight. ![]() It is an important tool in carpentry, the working of timber in a rough and unplaned state, as it does not require the timber to have a straight or squared edge formed onto it beforehand.Ī chalk line draws straight lines by the action of a taut nylon or similar string that has been previously coated with a loose dye, usually chalk. They may be used to lay out straight lines between two points, or vertical lines by using the weight of the line reel as a plumb line. ![]() A chalk line or chalk box is a tool for marking long, straight lines on relatively flat surfaces, much farther than is practical by hand or with a straightedge.
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