1996-10-16
1999-02-23
Rachuba, M.
Cutlery
Cutting tools
Saw
30508, 30509, 30510, 30513, 30514, 30518, B27B 2100
Patent
active
058731709
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns saws, especially hacksaws.
2. Description of the Prior Art
Hacksaws are common hand tools and can be used for cutting through a variety of materials. Usually a hacksaw blade is replaceable, so that a hacksaw can have a long useful life. However, a hacksaw is limited in its applications because of its rigidity and cannot be used easily in awkward situations or confined spaces.
An object of this invention is to provide a saw, especially a hacksaw, that may be used in a variety of situations.
SUMMARY OF THE INVENTION
According to the invention there is provided a saw, especially a hacksaw, comprising a blade holder, a handle for the blade holder at one end thereof and a saw blade detachably coupled to the blade holder, characterised in that the orientation of the blade relative to the handle is adjustable and/or the angle of the handle relative to the blade holder is adjustable.
The orientation of the blade is preferably adjustable through 90.degree., although it is not beyond the scope of the invention for the orientation of the blade to be adjustable through 180.degree. or even 360.degree..
The blade holder is preferably elongate and preferably has at each end two or more blade attachment locations, so that the blade may be attached in a range of orientations relative to the blade holder. Preferably the two orientations are at right angles to each other.
Preferably the blade attachment locations at the handle end thereof are provided on a member that is rotatable relative to the blade holder. The rotatable member is preferably connected to the handle but preferably separable therefrom. The member may be screw threadedly connected to the handle. That may have the advantage that the blade can be tensioned by screwing the handle to the member to draw it away from the other end of the blade holder.
In order to adjust the angle of the handle relative to the blade holder, it is preferred that a part of the handle or the rotatable member connected thereto extend through a passage in a block or the like, which passage is angled relative to a longitudinal axis of the block. Thus, by rotating the block about its longitudinal axis the angle of the handle may be adjusted. The block or the like is preferably mounted in a holder therefor at the handle end of the blade holder. The holder for the block preferably has a circular section passage for the block the axis of which is at an angle to the blade holder.
The rotatable member preferably has its blade attachment locations on a part thereof offset relative to a longitudinal axis of the member, whereby turning the member through 180.degree. the blade may be attached closer to or further away from the blade holder at that end thereof.
Generally the blade will be fixed relatively closely to the blade holder along its length. However, for some purposes it may be advantageous to have a greater spacing between the blade and the blade holder. To achieve that, an extension piece may be provided that is attachable to said one end of the blade holder and which provides blade attachment locations at its free end. The extension piece may conveniently be stored in the handle of the saw, for which purpose the handle is preferably hollow and preferably has a removable cap at its free end.
The blade attachment locations are preferably lugs to fit corresponding holes of the blades near their ends, a blade being retained on the blade holder by tensioning thereof. The lugs may have lips extending away from the blade end to assist retention of a blade on the lugs.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention will now be further described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 shows a saw of the invention with its blade and handle in one orientation;
FIGS. 2 to 8 show the saw of FIG. 1 with either or both of the handle or the blade in a different orientation;
FIGS. 9, 10 and 11 show the saw of FIG. 1 with an additional component whereby further blade and h
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Goodman Charles
Rachuba M.
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