The object of the invention herein disclosed is to provide a multi- purpose combination tool wherein the basic body member is a knife whose blade portion is formed to receive a further tool and the like.

The following disclosure of the invention primarily refers to big, so- called survival knives.

Well-known examples of combination tools using knife portions are e. g. multiple-use jackknives, or the knives incorporating various tools such as fish scalers, bottle openers and a saw, at the back of their blades.

Well-known as a military knife is the legendary wire-cutter combination tool consisting of the cutting point of the back of the knife blade with the counterpart of the metal point of the knife scabbard: the knife works as the movable handle of the pliers The insight idea of this invention is that in particular the so-called survival knife can when needed be formed into a hatchet whereby a wedged portion, for instance kept encased in the handle portion of the knife, is mounted to the knife blade, thereby forming the hatchet together with the cutting edge of the blade portion. This, for instance, saves the woodsman and the like on long wanderings from carrying along an often heavy and space-consuming axe.

THE CHARACTERISTICS OF THE INVENTION ARE FEATURED IN THE ACCOMPANYING PATENT CLAIMS.

The wedged portion is either one unit or consists of parts, and is adjusted to be attached to the knife blade whereto to be immovably locked.

The wedged portion can also incorporate other implements, such as the hammer head, and have fastening holes for any further tool, a saw blade for example.

The mounting of the wedged portion to the knife blade is best arranged so that one or more of the respective surfaces to be set against the blade portion are shaped to mate the shape thereof.

The mounting to the blade portion takes place from the side or top in view of the cross section of the blade.

Mounting can also be arranged along the longitudinal axis of the blade, either from the direction of the blade point (with the wedged cross-section of the blade), or from the direction of the knife handle (the knife handle is formed either wholly or partly by the wedged portion.) Since the cross-section of the knife blade just behind the blade point is identical (also dimensionally), the changing of the position of the wedged portion can easily be arranged along the longitudinal axis of the blade.

The secured locking of the wedged portion to the knife blade is best arranged by using either locking or fastening screws or pins or their combinations. Respectively the knife blade portion includes for example holes with or without threading, other apertures, recesses such as the blood groove, or rails, for providing for the attachment system of the wedged portion.

In particular in that embodiment of the invention where the wedged portion is partly or wholly the knife handle (incorporating of course the flat extension of the blade as the core), the lengthening of the blood groove can be thought to extend either as a recess or a slot up to the extension of the blade portion (to the handle of the knife), in which case the slot can operate for instance as the guide to the tightening-screw of the two-sided wedged portion being moved to the blade.

THE INVENTION AND ITS OTHER FEATURES AND ADVANTAGES ARE DESCRIBED IN GREATER DETAIL IN THE FOLLOWING EXAMPLES AND ILLUSTRATED IN THE ACCOMPANYING DRAWINGS.

Figure 1 shows in accordance with the invention the wedged portion as locked to the knife blade Figure 2 shows a slightly different embodiment of the invention.

Figure 3 shows in accordance with the invention the knife before being altered into a combination tool.

Figure 4 shows the knife of Figure 3 altered into a combination tool.

Figure 5 shows the embodiment of the invention where in the knife- position the wedged portion forms the whole handle (except for the extension of the blade portion.) Figure 6 in accordance with the invention shows the knife capable of being attached to some extension handle by means of the wedged portion detached from its handle.

Figure 7 shows another embodiment of the invention.

Figure 8 shows the cross-section of a blade differing from other knife blades to be fit in with the wedged portion.

Figure 1 shows the wedged portion (1), the subject of the tool, as adjusted against the one side and the back (6) of the blade portion (3) (L-model). It forms together with the cutting edge (2) of the blade portion (3) the hatchet (1; 2), which is simple and light-weight.

Herein the locking takes place with the fastening screws (5) to the threaded hole (7) in the blade portion (3).

Figure 2 shows such an embodiment of the invention, wherein the wedged portion (1) locked on both sides of the blade portion (3) is adjusted to be locked by being supported at its other end by the handle portion (4) of the knife (3; 4). Thereby the construction also well sustains lateral torsion. The locking of the wedged portion is arranged here with two locking screws (5) through the blade portion (3).

Figure 3 shows in accordance with the invention the combination tool in knife position. The wedged portion (1) is now part of the handle (1; 4; 11). The wedged portion (1) also has a hammer head (10), which in this case also works as the stopper when holding the knife (3; 4).

The picture also shows the T-shaped extension of the flat plate back (6) of the blade portion (3) starting from the end of the wedged portion (1).

Visible in the blade portion (3) is also the blood groove (8), which continues as a recess (9) in the extension (11) of the blade portion (3). At the other end of the blood groove (8) herein is a hole (7).

The wedged portion (1) is locked to the extension (11) of the blade portion (3) with two tightening screws (5) through the recess (9). The wedged portion (1) could now also be considered to be encased in the extension of the handle portion (4).

Figure 4 shows the same wedged portion (1) provided with the hammer head (10) locked here to the blade portion (3) of the knife (3; 4) with fastening screws (5). The handle (4; 11) of the hatchet (1; 2) is herein formed of the fixed part of the handle (4) and the extension (11) of the blade portion (3).

The T-shaped cross section strengthening the handle (4,11) of the extension (11) of the blade portion (3) is shown at the top (6) of the extension (11) of the blade portion (3).

Also visible is the recessed extension (9) of the blood groove, along which the wedged portion (1) has been moved to its exact position, resting on the rear (5) (slackened) screw (the foremost screw (5) is loosened). The front screw (5) could also in principle be working as the tightening screw (5) being locked at the bottom of the blood groove (8), whereby no hole would be needed at the other end of the blood groove (8).

Figure 5 is the embodiment of the invention, whereby the wedged portion (1) locked to the blade portion (3), prior to forming the hatchet portion (1; 2), has formed the whole handle portion (1; 4; 11) together with the extension (11) of the blade portion (3). The picture also shows the strengthened (T-shape) top edge (6) and the recess (9) of the extension (11).

Figure 6 shows the knife (3; 11) of Figure 5 here with the handle portion (1; 4) detached and as cabable of being fastened to a military rifle through the aperture (9) with some additional item (12).

Figure 7 has the wedged portion (1) fastened to the blade portion (3) now with a quick-locking pin (14). The picture also shows how the wedged portion (1) is adjusted to be kept on the extension (11) of the blade portion (3) as a part of the knife (3; 4) handle (1; 4; 11).

Locking is further provided with the same locking pin (5; 13).

Figure 8 shows the blade portion (3) now thinner than the strongest part of the cutting section. The wedged portion (1) (The locking can be similar to that in Fig. 4) lies now as if protected behind the "threshold"of the cutting section (2) of the blade portion (3).