Cutting – Other than completely through work thickness or through work... – Splitting
Patent
1993-10-07
1995-06-27
Seidel, Richard K.
Cutting
Other than completely through work thickness or through work...
Splitting
30371, 30373, 30374, B27B 1704, B27B 2708
Patent
active
054270073
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device in power saws of the type having a motor-supporting body and a guide bar connected thereto, comprising guide means which cooperates with the guide bar, extends parallel to it and is displaceable towards and away from the guide bar along at least one guide member, said guide means being connected to said guide member only at one end and having its opposite end free so as to form a free space between the free ends of the guide means and the guide bar.
The invention also relates to a method for initially sawing in a round log, by means of a device as described above, one or more cleaving cuts so as to form one or more flat surfaces.
BACKGROUND OF THE INVENTION
It is previously known to use motor-powered chain saws or power saws for cleaving timber, e.g. for sawing boards and planks from round logs. Thus, SE 8703174-6, for instance, discloses a sawing device where the power saw is mounted on a carriage which is movable along a saw stand parallel to the log to be sawn.
There is however a need for simpler and thus less expensive devices or supplementary appliances which are easier to carry along and which can be readily mounted on the power saw to permit cleaving timber in flat and straight cuts.
Devices of the type stated by way of introduction exist in many different designs. Thus, for instance, supplementary appliances for power saws are available under the trade marks ALASKAN MK III and STIHL which have guide means cooperating with the guide bar and movable towards and away from the guide bar along guide members. Common to all these prior-art appliances is that the guide members are connected to the guide bar in two separate points, namely in a point immediately adjacent the power saw body and a point at the guide-bar tip. Between these two fixing points a free guide-bar length is delimited which becomes decisive of how thick logs can be sawn by means of the device. It goes without saying that such mounting of the device reduces the maximum available guide-bar length that could be used in sawing. Since the outer guide member is fixed to the tip of the guide bar, this must be so long that the tip projects by a sufficient margin on the rear side of the log. Thus, in the case of extremely thick timber dimensions or e.g. root swells, it is not possible to carry out the cleaving cut in two steps from each side of the log. In order, nevertheless, to obtain acceptable sawing widths, extremely long guide bars must be used. However, long guide bars suffer from the major drawback of requiring high driving power, which means larger and heavier power saws. These devices therefore tend to become unnecessarily heavy and unwieldy. Furthermore, it generally becomes necessary to provide holes in the guide bar in which the guide members can be screwed.
Similar devices are also known from e.g. U.S. Pat. Nos. 3,225,799, 4,244,104 and FR 2,298,418.
When using sawing appliances of the type mentioned by way of introduction, a further problem is encountered when the first saw cut is to be made in the log. In fact, this saw cut is decisive of the subsequent sawing result, since the sawing surface then formed serves as a guiding plane for the next saw cut. Some sort of a guiding board or the like has previously been fixed to the circumferential surface of the round log, for instance by nailing, and the first saw cut has been made immediately under the guiding board. It is of course very difficult to fix a guiding board in a straight and reliable manner to the round surface of a log. Moreover, the nails must not penetrate too deep into the log, since The saw chain could be damaged if encountering the nails. Further, it is mostly desirable to make the first saw cut in a plane parallel to the log axis. Since the logs are usually tapering towards the top end, the guiding board must be trestled at this end of the log to compensate for the taper. This of course complicates the sawing operation to a great extent.
In most cases, it is further desirable from a round log to produce square boards and
REFERENCES:
patent: 3134409 (1964-05-01), Hayden
patent: 3225799 (1965-12-01), Hayden et al.
patent: 3965788 (1976-06-01), Granberg
patent: 4146962 (1979-04-01), Grube
patent: 4173240 (1979-11-01), Boyce
patent: 4244104 (1981-01-01), Grube
patent: 4858325 (1989-08-01), Miller
Seidel Richard K.
Woods Raymond D.
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