Cutlery – Cutting tools – Saw
Patent
1986-07-24
1989-02-28
Yost, Frank T.
Cutlery
Cutting tools
Saw
30381, 83830, B23D 5702, B27B 1708
Patent
active
048073660
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a compact chain saw suitable for cutting relatively hard synthetic resin materials, metal materials, lightweight concrete materials and the like.
A rotating circular saw, a reciprocating jigsaw or a band saw driven by a pair of rotors have hitherto been utilized for cutting relatively hard synthetic resin materials, metal materials and the like. However, the band saw is disadvantageously too large-sized for field work. The rotating circular saw or reciprocating jigsaw are presently mainly used in field work while a hand saw is still generally used as a handy device in the existing circumstances. With the circular saw, however, not only is the cutting depth limited by the radius of the circular saw, but it cannot clearly perform so-called cutting-off of slabs, whereby the range of its use is limited. With the jigsaw, on the other hand, not only is the cutting efficiency is deteriorated due to a mechanism of converting rotating motion of a motor into a reciprocating motion, but it is difficult to make its driving portion compact and the cutting depth is limited by the interval of its reciprocating motion. Further, although slab cutting-off is easier than with the circular saw, there remains the inconvenience of forming an introduction hole for cutting in advance.
Therefore, application of chain saw is proposed in order to compactly and provide simplicity of operation of the present saw to thereby enable easy performance of slab cutting-off etc. for cutting relatively hard synthetic resin materials, metal materials or the like. The conventional chain saw put into practice has been improved mainly with soft timber as the object to be cut (for example, U.S. Pat. No. 392,904), and hence the same is not suitable for practical cutting for the reason that, so far as such chain saw construction is utilized, teeth break, cracks are easily formed in the materials being cut such as relatively hard synthetic resin materials, metal materials, lightweight concrete materials and the like and vibration is excessive.
OBJECT OF THE INVENTION
An object of the present invention is to provide a compact chain saw suitable for cutting relatively hard synthetic resin materials, metal materials, lightweight concrete materials and the like.
Another object of the present invention is to restrict pivot actions and side-run phenomenons of the saw chain during cutting and provide a compact chain saw excellent in durability.
Still another object of the present invention is to provide a compact chain saw capable of cutting off slab materials.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are give by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is a perspective view of the compact chain saw according to the present invention.
FIG. 2 is a perspective view of a disassembled compact chain saw according to the present invention;
FIG. 3 is a side view of a portion of the chain saw shown in FIG. 1 showing details of its structure;
FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 3;
FIG. 5 is an edge view of the saw chain component of the present invention having a particular mode of saw-tooth setting;
FIG. 6 is an edge view of another mode of saw-tooth setting of the saw chain;
FIG. 7 is an edge view of a further mode of saw-tooth setting of the saw chain;
FIG. 8 is an edge view of still another mode of saw-tooth setting
REFERENCES:
patent: 2446774 (1948-08-01), Mall
patent: 2801653 (1957-08-01), Van Wagner
patent: 2984269 (1961-05-01), Gates
patent: 3039502 (1962-06-01), Spivey
patent: 4414876 (1983-11-01), Loigerot
patent: 4464964 (1984-08-01), Alexander
Masato Honsho
Toru Hanahusa
Folkerts Michael D.
Fuji Blade Co., Ltd.
Yost Frank T.
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