![]() ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US116488A Inventor Robert K Landon John R Thomson Current Assignee (The listed assignees may be inaccurate. Google Patents Combined chalk-line box and plumb bobĭownload PDF Info Publication number US2589500A US2589500A US116488A US11648849A US2589500A US 2589500 A US2589500 A US 2589500A US 116488 A US116488 A US 116488A US 11648849 A US11648849 A US 11648849A US 2589500 A US2589500 A US 2589500A Authority US United States Prior art keywords box case lid line box spool Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US2589500A - Combined chalk-line box and plumb bob A sumitsubo is a traditional tool included with them.US2589500A - Combined chalk-line box and plumb bob As part of this event, a set of symbolic carpenter's tools are freshly made and presented to the new building. On the completion of a major building, a large celebration or topping-out ceremony is held. ![]() As with many such tools, they're often made by their users while apprentices. These sumitsubo are highly decorated and much-prized by their owners. Alongside the line reel is a cavity filled with ink-soaked cotton fibres, which the line is drawn through as it is unreeled. ![]() Later spread in East Asian countries, in Japan it is called a sumitsubo. This is a silken cord, stored on a combined reel and inkpot which invented by Chinese master craftsman Lu Ban. In East Asia, an ink line is used in preference to a chalk line. Ink lines Sumitsubo and bamboo marking pens History Blue chalk line on concrete walls as level referenceĬhalk lines were used in ancient Egypt, are mentioned in Homer's Illiad, and have been used continuously by builders in various cultures since.Ĭontinuing development of this simple-but-effective tool focuses on the coloration for the chalk or marking compound, as well as the outer case and method of handling. Ĭhalk lines and plumb-bobs are often sold as a single tool. 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. Tool for marking straight lines Chalk line toolĪ 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.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |