Cutlery – Cutting tools – Saw
Patent
1985-07-23
1987-04-07
Peters, Jimmy C.
Cutlery
Cutting tools
Saw
30387, B27B 1702, B27B 1714
Patent
active
046549722
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a chain support blade for a chain saw wherein the blade protrudes from a motor casing of the saw, wherein a spur wheel is provided at the forward end of the blade for reversal of the chain, and a chain wheel is provided at the rearward end of the blade for transmitting drive from the motor to the chain.
Chain saws with support blades of the above type are well known, see for example U.S. Pat. No. 2,845,967, and are constructed in such a manner that the outer edges of the blade serve to support the saw chain and thus to absorb the effects of reactional diagonal forces on the longitudinal extent of the blade. In order to counteract the high friction created while sawing, oil must be applied continuously to the chain and blade. Thus, a wood cutter typically needs approximately three liters of chain saw oil per day for his saw, and this is not only costly but also contributes to pollution of the environment.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved arrangement of chain support blade in a chain saw which substantially eliminates the need for continuous application of oil.
A chain support blade in accordance with the invention is essentially characterized by the fact that in the area between the chain-carrying wheels, the chain runs extend over substantially the entire length of the blade in spaced relation to the longitudinal edges of the blade. With this arrangement, the creation of heat due to friction of the chain against the edges of the blade no longer occurs, thus making a continuous oil application unnecessary. The use of a chain saw in accordance with the invention is thus beneficial to the environment and lowers operating costs, since substantially no oil is required. A chain saw having a blade in accordance with the invention is also easier to handle since the space needed for an oil container is no longer required, and since the cumbersome manipulation of an oil supply valve is no longer necessary.
A guide wheel may be associated with the spur wheel at the distal end of the blade, the guide wheel being located to one side and rearwardly of the forward end of the blade, the guide wheel being a particular advantage in handling the chain saw because it facilitates guiding the saw blade in particular where branches have to be cut off, but also where a cut has to be made in heavier material, since the diagonal direction of travel of the short chain run between the guide wheel and the spur wheel creates components of force directed onto the material being cut.
It should be noted that a tree cutting machine is known (see U.S. Pat. No. 846,868) which comprises an arm that pivots about a vertical axis, twice bent, and whose ends comprise pins running parallel to the main plane of the arm, to form a support for a drive pinion and a reversing pinion. The bent ends of the arm and their laterally extending pin sections prevent the use of this tree cutting machine in the manner of a hand-held power saw provided with a flat support blade, since it is impossible to guide the bent outer end of the arm into and through a tree to be cut.
Similar considerations apply to a chain saw as disclosed in U.S. Pat. No. 1,273,394 which comprises a chain having toothed outer elements activated via a pressure mechanism comprising flanged discs. This chain saw does not have a blade type support and guide for the chain and therefore also cannot be used in conventional manner to cut or cut-up trees.
In order to saw through a tree, one chain saw proposal (see U.S. Pat. Nos. 789,512 and 1,617,565) is to leave a space between a return chain run and the effective working run of the chain, and to provide at least three rolls, spaced from each other to at least such a distance that the returning free-wheeling chain run exclusively passes into and through the trunk of the tree.
A conventional chain support blade of a conventional chain saw may be readily replaced by a support blade in accordance with the present invention, so that existing saws
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Sandholzer Hartwig
Sellmaier Horst
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