A guidance assembly for circular saws comprising a monobloc structural unit, which incorporates a first and a second subassembly and is interconnected and cooperates with a fence subassembly,
- first subassembly comprises:
- a discontinuous annular flat member having a center of symmetry, a first upside face, a second bottom face and terminating laterally and backwards in an upper end and a lower end;
- second subassembly comprises:
- a flat, inverted at 90 degrees U-shape elongated frame, extending frontwards, towards said discontinuous annular flat member, defined by a horizontal, longitudinal axis of symmetry and including an upper arm ending in a top end and a lower arm ending in a bottom end;
- said upper end interpenetrating with said top end and said lower end interpenetrating with said bottom end, thus forming said monobloc structural unit;
- other the fact, that said upper arm, via said top end, basically interconnects with said upper end along their respective widths, a narrow strip, detached from said upper arm, extends beneath it, horizontally and forwards into an interior of said discontinuous annular flat member;
- said center of symmetry of said discontinuous annular flat member being displaced vertically and downwards with respect to said horizontal, longitudinal axis of symmetry, thus a positional eccentricity being created;
- said lower arm, via said bottom end, after combining with said lower end, continues laterally, forwards until it intersects a curvilinear, concave, interior surface of said discontinuous annular flat member;
- an upper circular through slot and a lower circular through slot, both located in and being concentric with said discontinuous annular flat member traverse zones of the latter, respectively a top zone and a bottom zone;
- an upwardly directed arrow mark engraved immediately above said upper circular through slot and centered on the vertical diameter that passes through said center of symmetry of said discontinuous annular flat member, angle-indicating, equidistantly engraved marks incrementally extending at the left and right of said upwardly directed arrow mark, being preceded by an engraved inscription “HIP OR VALLEY”;
- said upwardly directed arrow mark, said angle-indicating, equidistantly engraved marks and the previously mentioned inscription being all disposed on an arc of a circle;
- a zero mark, engraved as “0”, coinciding vertically with said upwardly directed arrow mark and being flanked, at left and right up to 90°, by series of engraved, angle-indicating marks;
- said series of engraved, angle-indicating marks, at the left, being preceded by an engraved inscription “ROOF PITCH”;
- said zero mark, engraved as “0” and said series of equidistantly engraved, angle-indicating marks being all disposed on an arc of a circle adjacent to external periphery of said discontinuous annular flat member;
- an engraved mark 90 coinciding with the vertical diameter of discontinuous annular flat member, being disposed above and in contact with said lower circular through slot, in proximity of internal periphery of said discontinuous annular flat member;
- a first series of decremental marks, equidistantly engraved, adjacent to an external periphery of said discontinuous annular flat member, extending upwardly from a 90 engraved mark, collinear with said engraved mark 90, up to a “0” (zero) mark, while a second series of decremental marks, equidistantly engraved, adjacent to said external periphery of said discontinuous annular flat member, extending downwards from said 90 engraved mark, above mentioned, up to a mark 60;
- a bracket, perpendicular to said longitudinal axis of symmetry of said flat, inverted at 90 degrees U-shape elongated frame, being placed in an interior of said discontinuous annular flat member, close, at the left, to the internal periphery of the latter, and being delimited vertically, at its upper part, by said narrow strip and at its lower part by said interior of said discontinuous annular flat member;
- a web, which is a mirror image of said bracket, is situated at the farthest right extremity of said inverted at 90 degrees U-shape elongated frame;
- said bracket and said web incorporating, at their ends, a pair of elongated through-passage openings being provided with chamfered edges;
- said bracket and said web having their underside retracted from said second bottom face;
- a rigidity wall, retracted from said first upside face, encompassing said flat, inverted at 90 degrees U-shape elongated frame which is located in said interior of said discontinuous annular flat member;
- a pair of stiffening ribs joining said interior of said discontinuous annular flat member with said flat, inverted at 90 degrees U-shape elongated frame, respectively via said bracket and said narrow strip, coinciding directionally, one of said pair of stiffening ribs-with vertical diameter and the other one of said pair of stiffening ribs with horizontal diameter of said discontinuous annular flat member;
- said pair of stiffening ribs protruding from said rigidity wall and extending upwards up to said first upside face;
- a pair of angle beams, each one of said pair of angle beams being provided with unequal legs, one vertical leg and the other-horizontal leg, said vertical leg being provided with flat ends at both extremities;
- said vertical leg of one of said pair of angle beams being so positioned as to face another said vertical leg of the other of said pair of angle beams;
- each said flat end being provided with a threaded opening;
- screws with countersunk heads being inserted via said pair of elongated and spaced through-passage openings, located at the extremities of said bracket and of said web and provided with chamfered edges and, then, tightened into said threaded openings, distances between said vertical legs being adjustable so that said pair of angle beams is adaptable to receive various circular saws with various bases;
- a thickness of said pair of angle beams is so chosen that the latter does not protrude beyond said second bottom face;
- said second bottom face of said monoblock structural unit being formed by a flat surface interrupted by a rectangular opening delimited by internal edges of said bracket and said web, by internal edges of said upper arm and of said narrow strip, detached from said upper arm, and by internal edge of said lower arm which via said bottom end, after interconnecting said lower end, continues laterally and forwards until intersects a curvilinear, concave, interior surface of said discontinuous annular flat member;
- said flat surface being also interrupted by a ring type channel having a U-shape cross section;
- said ring type channel extending outside, at a relative short distance from of said upper circular through slot and said lower circular through slot;
- a internal edge of said ring type channel being coplanar with said second bottom face, while an external edge of said ring type channel is somewhat retracted with respect to said internal edge;
- said external edge extending outwardly into an external ring with which is coplanar;
- said external ring extending backwardly, at both external margins of said upper arm and said lower arm, by elongated strips, both coplanar with said external ring;
- said fence subassembly, which is interconnected and cooperates with said first and second subassemblies that constitute a monobloc structural unit, comprising an annular flat segment provided on its top side with planar circular zones projecting beyond said annular flat segment and shaped and sized for engaging said ring type channel and, respectively, said external ring;
- a first hollow bar, having a rectangular cross-section and extending from both sides of a right extremity of annular flat segment, is so attached to said annular flat segment that their upper surfaces are coplanar, an internal end of said first hollow bar being so cut off that an obtuse angle is formed;
- a second hollow bar, having, as well, said previously mentioned rectangular cross-section and extending from both sides of a left extremity of said annular segment being so attached to said annular flat segment that their upper surfaces are coplanar;
- an internal end of said second hollow bar being so cut off that an acute angle is formed;
- a pair of screws securely attached vertically to said annular flat segment being so spaced as to penetrate through said upper circular through slot and said lower circular through slot;
- a pair of threaded coupling pieces together with said pair of screws being used to positionally secure said fence subassembly to said first and second subassemblies;
- first hollow bar being provided outside said annular flat segment, at the left, with a plurality of indicating marks extending from “9” to “20”.