FOLDING HACK SAW Russian patent published in 2007 - IPC B27B21/00 

FIELD: manual tools, namely folding hack saws for cutting different materials.

SUBSTANCE: hack saw includes П-shaped handle; working web whose one end is secured to handle; first rotary pivot; first, second, third links arranged in handle; second and third rotary pivots; outer unit for mounting working web. First link is П- shaped one, it is provided with first member for mutual fixation relative to handle and its is secured to handle by means of first rotary pivot. Second link is provided with second member for mutual fixation relative to first link, it is joined with first link by means of second rotary pivot in such a way that at rotating around said pivot second link having guiding slits is arranged inside first link. Third link is joined through third rotary pivot arranged in said guiding slits with second link and it has member for fixation relative to second link. Outer unit for mounting working web is arranged in free end of third link. Said third link may be placed inside second link after releasing its fixation and displacing it inside third link along said guiding slits.

EFFECT: reduced size, comfort usage of manual hack saw.

3 dwg