RU2736029C1 - Folding knife - Google Patents

Abstract

FIELD: cutting tools.

SUBSTANCE: invention relates to cutting tools, namely to folding tourist knives. Folding knife comprises rotary blade with shaped heel and handle formed by first and second housing elements. Front case is secured in the first case element. Second housing element is connected to the first one by means of a single rear axle, which is located on the opposite side from the front axis of the blade and is equipped with a loading body elements with a return spring. Second body element is equipped with a locking roller interacting with the blade heel. Both housing elements are doubled to form inner space. First housing element is located in internal space of the second housing element, and the blade in the folded position - in internal space of the first housing element.

EFFECT: higher reliability and safety of folding knife.

5 cl, 4 dwg

Description

The invention relates to cutting tools, namely to folding camping knives.

A folding knife is known from the prior art, comprising a swivel blade with a figured heel, in which the main and additional grooves are made, and a handle formed by the first body element, in which the front axis of the blade is fixed, and the second body element, connected to the first through a single rear axis, which is located on the opposite side from the front axis of the blade and is equipped with a return spring loading the body elements (see patent CN 202540316 U, class B26B 1/02, publ. 21.11.2012). The main disadvantages of the known device are fragility and relatively high invasiveness of use.

The problem of the invention is the creation of a reliable and easy-to-use folding knife design with the elimination of the noted drawback. The technical result consists in accelerating the blade at the final stages of opening and closing to ensure that the extreme positions are reached and to ensure the safety of using a folding knife. The problem is solved, and the technical result is achieved by the fact that in a folding knife containing a swivel blade with a curly heel, in which the main and additional grooves are made, and a handle formed by the first body element, in which the front axis of the blade is fixed, and the second body element, connected with the first through a single rear axis, which is located on the opposite side from the front axis of the blade and is equipped with a return spring loading the body elements, the second body element is equipped with a locking roller interacting with the blade heel, and both body elements are doubled to form an internal space, and the first body the element is located in the inner space of the second body element, and the blade in the folded position is located in the inner space of the first body element. The heel of the blade is preferably provided with a support pin, and the first body element with a corresponding groove for fixing the blade in the unfolded position. Between the main and additional grooves on the heel of the blade, intermediate grooves of a smaller depth are preferably made. The ends of the return spring preferably abut against the pins of the first and second housing elements. The butt of the blade is preferably provided with a pin.

Figure 1 shows a side view of the proposed knife in the unfolded position;

figure 2 is a General view without one of the double parts of the second housing element;

figure 3 is a side view in a half-closed position;

Fig. 4 is a side view in a folded position without half of the doubled portions of both housing elements.

The proposed folding knife consists of a handle formed by the first inner housing element 1 and the second outer housing element 2, and a rotary blade 3 with a peg 4 on the butt and a figured heel 5. Both housing elements 1, 2 are made double of mirror-symmetric halves to form an inner space. The first body element 1 is located in the inner space of the second body element 2, and the blade 3 in the folded position is located in the inner space of the first body element 1.

In the first body element 1, the front axis 6 of the blade is fixed and a groove 7 is made for fixing in the unfolded position of the support pin 8 mounted on the blade 3. The groove 7 and the pin 8 restrict the movement of the blade at the extreme point of the unfolded position and create an additional support pair for the overall rigidity of the structure ... The body elements 1, 2 are interconnected by means of a single rear axle 9, which is located on the opposite side from the blade axis 6 and is equipped with a return spring 10. The ends of the spring 10 abut against the pin 11 of the first and the pin 12 of the second body elements, loading them. Thus, the front parts of the housing elements 1, 2, while rotating around the rear axis 9, can move relative to each other.

The second body element 2 is equipped with a locking roller 13 freely rotating on the axis 14 and interacting with the heel 5 of the blade. The rotation of the roller 13 allows to reduce friction when moving the blade 3 from the folded position to the unfolded position and vice versa, thereby reducing the likelihood of the knife jamming. In the heel 5, the main groove 15 is made for fixing the blade 3 in the unfolded position, an additional groove 16 for fixing the blade 3 in a semi-closed position (to prevent finger injuries), as well as intermediate grooves 17 of smaller depth located between them, providing controlled closing of the knife.

The proposed folding knife works as follows.

The unfolded blade 3 is reliably fixed by a system of a locking roller 13, which enters the main groove 15, and a support pin 8, which fits into the groove 7 of the first body element 1.

To close the folding knife, it is necessary, holding it by the outer second housing element 2 with the thumb and middle fingers, and with the index finger press the blade 3 in the region of the pin 4 in the folding direction. This movement opens the connection of the locking roller 13 with the main groove 15, after which it will smoothly slide along the intermediate grooves 17 of the shaped heel 5. When pressed, the blade 3 moves around the front axle 6, in which the shaped heel 5 changes the distance between the locking roller 13 and the front axis 6, causing the first body element 1 to lower and rise relative to the second body element 2 with a locking roller 13. The spring 10 is constantly in a stressed state and, leaning against the pins 11, 12, tends to hold the first body element 1 in the position determined by the point of contact of the heel 5 and locking roller 13. When the geometry of the grooves of the heel 5 allows accelerating the entry of the locking roller 13 into the groove of the blade under the action of the spring 10, the blade is accelerated in the final stages of its closing or opening and guaranteed reaching the extreme positions.

Before full folding, the locking roller 13 enters the additional groove 16 and stops the blade 3 in the half-closed position, preventing the blade 3 from falling onto the fingers. In this case, the intermediate grooves 17 of the shaped heel dampen the inertia of the blade movement. To completely close the knife, it is necessary to bring the blade 3 to the position inside the body elements 1, 2 of the handle.

Blade 3 is extracted with a circular motion of the thumb by the pin 4 around the front axle 6 in the style of traditional folders.

Due to the implementation of the axis 6 of the blade and the locking roller 13 on different body elements, spring-loaded relative to each other, it is guaranteed that the extreme positions of the blade 3 are reached and the knife is fixed in working configurations, which increases the safety of its use. In addition, the load is distributed much more efficiently on the various elements of the handle, which reduces the likelihood of breakage. The design of the body elements 1, 2 with an internal cavity reliably protects the blade 3 in the folded position and forms a strong handle in the unfolded position, which also increases the reliability and safety of using the device.

Claims (5)

1. A folding knife containing a swivel blade with a figured heel, in which the main and additional grooves are made, and a handle formed by the first body element, in which the front axis of the blade is fixed, and the second body element, connected to the first through a single rear axis, which is located on the opposite side from the front axis of the blade and is equipped with a return spring loading the body elements, characterized in that the second body element is equipped with a locking roller interacting with the blade heel, and both body elements are doubled to form an inner space, with the first body element located in the inner space of the second body element, and the blade in the folded position is in the inner space of the first body element. 2. A folding knife according to claim. 1, characterized in that the heel of the blade is provided with a support pin, and a corresponding groove is made in the first body element for fixing the blade in the unfolded position. 3. A folding knife according to claim. 1, characterized in that between the main and additional grooves on the heel of the blade, intermediate grooves of smaller depth are made. 4. A folding knife according to claim. 1, characterized in that the ends of the return spring abut against the pins of the first and second body elements. 5. A folding knife according to claim 1, characterized in that the butt of the blade is equipped with a pin.

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