초록 ▼

An automatically retracting chalk line assembly having both locking and braking means to lock the extended line in place and to slow the speed of retraction of the line during automatic rewind. The spool containing the line has an extended side in a hub cap shape which protrudes through a circular a

An automatically retracting chalk line assembly having both locking and braking means to lock the extended line in place and to slow the speed of retraction of the line during automatic rewind. The spool containing the line has an extended side in a hub cap shape which protrudes through a circular aperture in the housing. A slide member is moved out of a channel in this hub cap to form a friction lock with the housing. Braking is accomplished by slowing the spin of the hub cap by hand pressure.

대표청구항 ▼

A chalk line assembly combined with an automatic retracting line mechanism comprising: (A) a housing having an open interior space, two major walls, a circular aperture on one major wall, and a closeable access port to allow insertion of a quantity of chalk dust; (B) a spring post extending from the

A chalk line assembly combined with an automatic retracting line mechanism comprising: (A) a housing having an open interior space, two major walls, a circular aperture on one major wall, and a closeable access port to allow insertion of a quantity of chalk dust; (B) a spring post extending from the interior side of the major wall not containing the circular aperture, the axis of the spring post passing through the center of the circular aperture; (C) a spool, having an annular wall and two radially extending lips forming a U-shaped channel around the circumference of the spool, one side of the spool being open, the other side of the spool comprising a hub cap, being an axially extending bowl shaped wall having a maximum circular perimeter slightly smaller in size than the circular aperture of the housing, such that the hub cap portion of the spool extends through the circular aperture of the housing; (D) a spool cap adapted to close the opening in the spool, with an aperture to allow the spool cap to fit over the spring post; (E) a length of line, of a material able to retain an amount of chalk dust by adhesion, having one end attached to the annular wall of the spool and the other end extending out through an opening in the housing and attached to an end-piece, the majority of the line being wound about the spool in the U-shaped channel; (F) a coiled spring having one end attached to the spring post and the other end attached to the interior of the annular wall of the spool.