1997-09-19
1999-07-13
Payer, Hwei-Siu
Cutlery
Cutting tools
Saw
30507, 30517, B23D 5100
Patent
active
059209941
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tree saw developed as a bow saw. Such bow saws are available in two variants. The one variant, which is known, for instance, as the Dithmarsch form, has on the rear section of the frame an ergonomically favorably shaped handle by which the saw can be grasped and conveniently operated provided that the branches or other parts to be sawed are near the handle.
If more distant objects, for instance branches which are high up or at a distance away are to be sawed off, saws to which an extension rod can be connected, for instance a telescopic rod, are used. There are saw blades to which either a handle or a rod can be attached via a suitable coupling. For tree saws which are developed as bow saws, the bow-shaped frame has been provided with a cylindrical or conical socket into which an extension rod can be inserted. The handling of such a saw or rod is, however, difficult and unfavorable since a conveniently accessible handle is not present and the saw must be grasped on the frame and/or on the socket.
The object of the present invention is therefore to provide a tree saw which is developed as a bow saw and can be used optionally with the customary ergonomically favorably shaped handle or with an extension rod in order to saw off objects lying at a greater distance away.
This object is achieved by the features set forth in claim 1, taken together. By the arrangement in accordance with the invention of the coupling place on the end of the bow-shaped frame the result is obtained that its presence is not noted and the handling of the saw cannot be impaired since those coupling parts lie embedded within the handle when the saw is operated directly by one's hand. By the swinging-away of a handle piece, which is preferably developed as a handle shell, the coupling elements provided on the saw are, in accordance with one suitable embodiment of the invention, automatically brought into their active position so that after an extension rod has been pushed on a device insertion pin forming the coupling element of the saw, the saw is immediately ready for use.
As rod-attachment coupling, there is preferably used a rod-attachment coupling in accordance with Federal Republic of Germany 31 30 703 C2, but other rod-attachment couplings can also be used, including ones which are already available on the market, provided that they have a coupling element which corresponds to the device insertion pin (or its mating piece) and is swingably pivoted on the bow-shaped frame in such a manner that it is covered by the handle when not in use and which, in coupled position, can be form-locked in one or more positions.
Various developments of the invention can be noted from the dependent claims.
One embodiment of the invention will be described below with reference to the drawing, in which:
FIG. 1 is a side view of a bow saw developed in accordance with the invention, with the handle in inward-swung position, the handle being shown broken open so that the inward-swung device insertion pin is visible;
FIG. 2 shows the bow saw of FIG. 1 with a rod attached via a rod-attachment coupling on the end of the frame;
FIG. 3 shows a side elevation view of the fastening and mounting of the device insertion pin on the end of the frame;
FIG. 4 is a top view thereof;
FIG. 5 is a front view of a safety disk on FIG. 4;
FIG. 6 is a section at 6-6 in FIG. 4; and
FIG. 7 is a side elevation view of a detent member in FIG. 3.
FIG. 1 shows a bow saw of the so-called Dithmarsch type developed as tree saw, such as used in orchards, gardens and vineyards, as well as in the field of construction, by homeowners and the like.
The saw has a bow-shaped frame 10 which bears on its front end a front receiving mounting 12 for the saw blade 14. The rear receiving mounting 16 for the saw blade is arranged in a short lever arm 18 of a tensioning lever 20 which is pivoted via a pivot pin 22 on the rear end of the frame and which is adapted in shape to the rear section of the frame 10. The tensioning lever 20 is secured in the tensioned posit
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patent: 2613709 (1952-10-01), Terrill
patent: 4328848 (1982-05-01), Miller
Payer Hwei-Siu
Wolf-Gerate GmbH Vertriebsgellschaft KG
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