DE4409976A1 - Releasable connection between knife blade and handle - Google Patents

Abstract

The knife blade is connected to the handle via a screw. The blade has a thickness of 6 mm to 25 mm at the connection point. In this area, it also has a threaded blind hole M3 M18, pref. a fine-pitch thread with a pitch of 0,35 mm to 2 mm, and a depth of 3 mm 25 mm.The connecting screw is a cheese head screw M3 M18, pref. of titanium. The handle has a stepped bore to accommodate the screw. It also has a reinforcing sleeve, pref. of titanium, aluminium, or steel. Blade and handle are screwed together with a torque of 3 Nm to 240 Nm.

Description

A very important factor for the quality of a Utility knife has the handle attached to the Blade. With knife blades of common design one calls the connector of the handle as tang or angel. This Erl is a flat, round, round with thread lock at the end, or as a so-called full integral knife. At the Flacherl or Platterl is a through going flat strips of the actual blade material. The term is achieved using two handle scales, riveted, screwed and - or ver be stuck, with the flat on as a narrow strip the top and bottom of the handle remains visible. The round also consists of the extension of the Blade material, being a paragraph or a gradual Tapering occurs at the transition to the blade. The attachment the handle on such a round is done by gluing or in the case of metal handles, possibly by soldering, or by riveting. The round can only z. T. in the handle and have a thread on which the handle is screwed or pull the handle all the way through, where at the end a thread can be attached, which for Fuse may have screwed on a gag. With the so-called The full integral knife is also a blade and Erl from the same material, the transition from blade to the handle is more powerful and different ge can be designed. The term is also used here two handle scales which in turn are riveted and - or glued (Lit .: The knife, weapon and tool, by Wolfgang Rausch, Motorbuchverlag, Stuttgart).

The following disadvantages exist:

• 1. High consumption of knife steel in all variants.
• 2. The tang will also help with the hardening of the blade hardened and therefore unnecessarily at risk of breakage.
• 3. The transition from the knife blade to the tang, the real critical point in terms of stability and support Availability, can not with the methods shown optimally designed, or see points 5 and 6.
• 4. Disassembly or interchangeability, eg. B. the handle, is only with great effort or not at all possible.
• 5. Design restrictions, especially for flat items.
• 6. Relatively high weight.

The invention is based on the object of a possibility to find a highly stable, releasable ver binding between a knife blade and a handle create without design restrictions, especially in the outward direction look at the design of the handle, if possible ge light weight.

The invention relates to a connection of a Knife blade with a handle, which is characterized is that the knife blade on the back, at the transition to the handle has a blind hole thread in which a screw engages, which screwed the handle to the blade.

If within the scope of the present invention of knife blades in the broadest sense is to be spoken stand. For example, it can be a combat knife, or so-called survival knives, bayonets, cutlery knives and also around Cutlery forks and the like act.

An embodiment of the invention will be explained with reference to FIG. 1 and FIG. 2.

Show it

Fig. 1 a knife mounted, side view;

Fig. 2 dto. Top view.

In the figures, the knife blade ( 1 ) is provided with a 7 mm deep blind hole thread M 8 × 1. The handle ( 2 ), here made of rosewood, is screwed to the knife blade with a cylinder screw ( 3 ) M 8 × 1 × 32 - 10.9, which is formed here as an expansion screw, with a torque of 35 Nm. For handle materials that have sufficient inherent strength, the connection can be made directly via a corresponding stepped hole ( 4 ) in the handle. In the case of handle materials that have a lower inherent strength, the stepped bore is reinforced by a sleeve made of a suitable material with a view to the lowest possible weight, preferably made of aluminum or titanium, or other suitable material. The opening to the end of the handle can be closed with a freely designed locking part ( 5 ) made of brass. The closure part can advantageously be provided with a thread and screwed. The thickness of the blade, at the transition to the handle, in which the blind hole thread is located, can range from small knives for threads M 3.6 mm wide to large knives for threads M 12 to 20 mm wide and above.

In the example shown, the width of the blade is back for the used M 8 × 1 thread 12.5 mm. On before The most partial has been the use of a fine thread shows pitch 1 mm, but other threads can gradients can be used.

The screw can be made of steel and strength of 8.8 to 12.9. Can further reduce weight also a screw made of titanium or similar light, high solid materials are used.

The execution of the screw as an expansion screw has Particularly proven because of the connection between the handle and the knife blade naturally changing forces occur, however normal thread screws can also be used. For the head design of the screw are all suitable guides that can transmit high torques, e.g. B. Hexagon socket, multi-tooth, Torx etc. The screw-in depth the screw in the back of the blade should be with an M 8 screw Not less than 7 mm, but can be of sufficient length of the thickened blade back up to 20 mm and above wear.

The length of the screw can be up to approx. half of the handle is enough, but the screw can shorter or longer, depending on the handle material used, in reach the handle. With an execution as in the example ge shows, a cavity is created in the handle. The one at survival Knives used to hold various materials can be.

The contact surfaces from handle to knife blade and from handle to closure part can by seals from usual Materials are sealed.

To achieve an optimal exchange accuracy of knives blade and handle, the handle at the transition to the back of the knife which carries the blind hole thread, be provided with a shoulder, which opens into a corresponding groove on the back of the knife. Exactly this can be done using dowel pins or other constructive measures took place.

The tightening torque of the screw, the knife blade and handle connects, depends on the strength of screw and Handle. In one case, a knife blade with a handle made of titanium with an expansion screw M 10 × 1 12.9 with screwed with a torque of 56 Nm.  

The advantages which can be achieved with the invention are in particular to be seen in the fact that an easily removable, high-strength Connection between a knife blade and a handle was achieved. It is compared to knives of the same size achieved considerable material savings. The fiction Knives manufactured in accordance with a lower weight than conventional constructions. It is an easy exit Interchangeability, or replacement, repair of components possible. No design and execution restrictions from Knife blade and handle. It can all be considered Blade material materials (e.g. carbon steel, rust-resistant, stainless steels, powder metallurgical steels etc.) and Handle materials (natural materials: wood, horn etc. as well as plastics, metals etc.) can be used.

With appropriate selection of the handle z. B. Titan, can also no solution of the connection due to an action of high temperatures (exposure to fire).

Claims (12)

1. Removable connection of a knife blade with a handle, characterized in that a knife blade is screwed to a handle by a screw. 2. Removable connection according to claim 1, characterized ge indicates that the thickness of the knife blade at the over passage to the handle is 6 mm to 25 mm. 3. Removable connection according to claim 1 and 2, characterized characterized in that the knife blade at the transition to Handle a blind hole M 3 - M 18, preferred a fine-thread bore, pitch 0.35 mm - 2 mm owns. 4. Detachable connection according to claim 1 to 3, characterized characterized in that the blind hole is a Has a depth of 3 mm - 25 mm. 5. Detachable connection according to claim 1 to 4, characterized characterized in that a cylinder screw M 3 - M 18, preferably with fine thread with a pitch of 0.35 - 2 mm is used. 6. Removable connection according to claim 1 to 5, characterized characterized in that a titanium screw is used. 7. Detachable connection according to claim 1 to 6, characterized characterized in that the handle has a stepped bore for opening take the screw owns. 8. Removable connection according to claim 1 to 7, characterized characterized in that the handle is a sleeve for reinforcement comprises, preferably made of titanium, aluminum or steel. 9. Detachable connection according to claim 1 to 8, characterized characterized in that the handle with the knife blade with a torque of 3 Nm - 240 Nm is screwed. 10. Removable connection according to claim 1 to 9, characterized characterized in that the handle is a free Ver closing part made of any material, preferably with Ge winch, owns. 11. Removable connection according to claim 1 to 10, characterized characterized in that the contact surfaces from handle to Knife blade and from handle to fastener with one Seal be sealed.   12. Removable connection according to claim 1 to 11, there characterized in that the contact surfaces of handle to knife blade with dowel pins, or other constructive measures, preferably with tongue and groove, are designed vertically or horizontally.