RU214188U1 - BUTTERFLY KNIFE - Google Patents

Abstract

The utility model relates to training devices, in particular to folding knife designs, and can be used when practicing flipping tricks. Butterfly knife contains a blade, including the proximal and distal parts. A limiter is mounted on the proximal part of the blade and halves of the handle are pivotally mounted, in which longitudinal grooves are made with the possibility of placing the blade in them in the folded state of the knife, and the handles are interconnected by a latch. The hinged connection of the halves of the handle is made by a detachable screw connection, while washers are mounted between the blade and the halves of the handle on the screw on both sides relative to the blade. The latch is spring-loaded, provided with a nut and, in the unfolded state of the knife, is located along the longitudinal axis of symmetry of the mentioned half of the handle, and in the folded state of the knife, the latch is located in the grooves perpendicular to the longitudinal axes of symmetry of each half of the handle. One side of the nut has a conical part and is directed by said conical part towards the groove of the handle, and a corrugated surface is made along the periphery of the nut. Through holes are made in the blade and halves of the handle, balancing the mass of the blade and the handle in such a way that the center of mass of the knife is located at the point of the hinged connection of the blade with the halves of the handle. The technical result is to increase the reliability of the butterfly knife. 4 w.p. f-ly, 8 ill.

Description

The utility model relates to training devices, in particular to folding knife designs, and can be used when practicing flipping tricks [B26B 1/02, B26B 1/04].

Known FOLDING KNIFE [RU 188757, published: 04/23/2019], containing a handle connected to the blade by means of a hinge element, characterized in that the hinge element is made in the form of a bar, which is installed with the possibility of rotation relative to the handle and the blade and fixing them in a closed and open positions of the knife by means of spring-loaded pins, wherein one pin is located to secure the blade in the groove made on the bar, and the other to secure the bar in the groove made on the handle.

However, this device has a disadvantage:

inability to perform flipping tricks;

insufficient reliability of the knife design.

A FOLDING KNIFE is known [RU 205749, published: 08/06/2021], containing a blade located between the halves of the handle with the possibility of rotation around an axis connecting the halves of the handle, characterized in that the blade is mounted on two angular contact bearings with inner and outer rings, and the outer bearing rings are fixed in the blade.

However, this device has the disadvantage

inability to perform flipping tricks;

insufficient reliability of the knife design.

Known FOLDING KNIFE [RU 153606, published: 07/27/2015], containing a blade located between the halves of the handle with the possibility of rotation around the axis connecting the halves of the handle, and support washers, characterized in that between the blade and washers mounted separators with radial cylindrical rollers, located in the nests at least two concentric circles, while the rollers are associated with the blade and washers.

However, this device has the disadvantage

inability to perform flipping tricks;

insufficient reliability of the knife design.

The closest in technical essence is the BUTTERFLY KNIFE [https://yandex.ru/images/search?text=%D0%BD%D0%BE%D0%B6%20%D0%B1%D0%B0%D0%B1 %D0%BE%D1%87%D0%BA%D0%B0%20%D1%87%D0%B5%D1%80%D1%82%D0%B5%D0%B6%D0%B8&from=tabbar&pos=8&img_url =https%3A%2F%2Fi.pinimg.com%2F736x%2Ff5%2F7f%2Fcd%2Ff57fcde318e3a2dd49d7df7dcdb2d607.jpg&rpt=simage], containing a blade, including the proximal and distal parts, a limiter is mounted on the proximal part of the blade and holes are made, in the folded state the blade is located between the halves of the handle, and a latch is installed in one of the halves of the handle.

The main technical problem of the prototype is the insufficient reliability of the knife design.

The technical result of the utility model is to increase the reliability of the butterfly knife.

This technical result is achieved due to the fact that the butterfly knife containing a blade, including the proximal and distal parts, a limiter is mounted on the proximal part of the blade and halves of the handle are pivotally mounted, in which longitudinal grooves are made with the possibility of locating the blade in them in the folded state of the knife, the handles are interconnected by a latch, characterized in that the hinged connection of the halves of the handle is made by a detachable screw connection, while washers are mounted between the blade and the halves of the handle on the screw on both sides relative to the blade, and the latch is spring-loaded, equipped with a nut and, in the unfolded state of the knife, is located along the longitudinal axis of symmetry of said half of the handle, and in the folded state of the knife, the latch is located in the grooves perpendicular to the longitudinal axes of symmetry of each half of the handle, and one side of the nut has a conical part and is directed by the mentioned conical part towards the groove of the handle, and along the periphery A corrugated surface is made in the rii of the nut, through holes are made in the blade and halves of the handle, balancing the mass of the blade and the handle, so that the center of mass of the knife is at the point of the hinged connection of the blade with the halves of the handle.

In particular, the blade is made pointed.

In particular, the distal part of the blade is made of a semicircular shape, and the blade of the blade on each side is made of an arcuate shape, conjugated with the distal part of the blade.

In particular, the through holes balancing the mass of the blade and the handle are made symmetrically with respect to the longitudinal axes of symmetry of the blade and halves of the handle.

In particular, the through holes are made of different sizes.

Brief description of the drawings.

In FIG. 1 shows a butterfly knife in a folded state, front view.

In FIG. 2 shows a butterfly knife in a folded state, side view.

In FIG. 3 shows a cross section of a butterfly knife in a folded state along the line A-A.

In FIG. 4 shows a cross-section of a butterfly knife in a folded state along the line B-B.

In FIG. 5 shows a section of the blade along the line B-B.

In FIG. 6 shows a cross-section of the handle of a butterfly knife in the folded state along the G-G line.

In FIG. 7 shows a butterfly knife in the unfolded (combat) state, front view.

In FIG. 8 shows a cross-section of a butterfly knife in the unfolded (combat) state along the D-D line.

The figures indicate: 1 - blade, 2, 3 - halves of the handle, 4, 7, 8 - screws, 5 - washers, 6 - grooves, 9 - retainer, 10 - nut, 11 - spring, 12 - limiter, 13, 14 , 15, 16 - through holes.

Implementation of the utility model

The butterfly knife contains a blade 1 located between the halves 2 and 3 of the handle with the possibility of rotation around the axis and connecting the halves 2 and 3 of the handle.

Blade 1 contains proximal and distal parts. Holes are made on the proximal part symmetrically with respect to the longitudinal axis of symmetry, with the possibility of hinged mounting of halves 2 and 3 of the handle to these holes. Swivel halves 2 and 3 of the handle to the blade 1 is made with the possibility of mutual rotation of the blade 1 and halves of the handles.

Each of the halves 2 and 3 of the handle in cross section has a U-shaped profile and in the folded state the edges of the side shelves face the blade 1, and the blade 1 is located between the said side shelves of the profile halves 2 and 3 of the handle.

The hinged connection of halves 2 and 3 of the handle is made with screws 4 and washers 5 located on screws 4 between the blade and the side shelves of halves 2 and 3 of the handle.

In the lower part of each half 2 and 3 of the handle, grooves 6 are made. In the half 3 of the handle, a latch 9 with a nut 10 is hinged by means of screws 7 and 8 and is located along the longitudinal axis of symmetry of the halves 3 of the handle, and in the folded position, the latch 9 is located in the grooves 6 perpendicular to the longitudinal axes of symmetry of each half of the handle 2 and 3.

The spring 11 is mounted between the latch 9 and the screw 8. One side of the nut 10 has a conical part, and is directed by said conical part towards the groove 6 of the handle 2, and a corrugated surface is made along the periphery of the nut 10.

The distal part of the blade 1 is made of a semicircular shape, and the blade of the blade 1 on each side is made in an arcuate shape, conjugated with the distal part of the blade 1.

In the proximal part of the blade 1, between the holes closer to the edge of the blade, on the longitudinal axis of symmetry, a cylindrical limiter 12 is mounted, the ends of which protrude beyond the surface of the blade 1 in both directions.

Between the proximal and distal parts of the blade 1 along the longitudinal axis of its symmetry, through holes 13 of larger diameter are made and are equidistant from each other. Between the through holes 13 on both sides of the longitudinal axis of symmetry of the blade 1, through holes 14 of smaller diameter are symmetrically made. Along the longitudinal axis of symmetry of each halves 2 and 3 of the handle in the side shelves with an equal distance from each other, through holes 15 of a larger diameter are also made.

Between the through holes 15 on both sides of the longitudinal axis of symmetry of each of the halves 2 and 3 of the handle, through holes 16 of smaller diameter are symmetrically made.

The mass of the blade 1 is equal to 1/2 of the mass of one half of the handle 2 or 3.

In particular, the blade 1 can be made pointed.

In particular, the distal part of the blade 1 can be made of a semicircular shape, and the blade of the blade 1 on each side is made of an arcuate shape, conjugated with the distal part of the blade 1.

In particular, the through holes 13, 14, 15, 16, balancing the weight of the blade and the handle, are made symmetrically about the longitudinal axes of symmetry of the blade 1 and halves 2 and 3 of the handle.

In particular, through holes 13, 14, 15, 16 can be made of different sizes.

Butterfly knife is used as follows.

Butterfly knife is designed for inertial opening and closing. In the folded state, blade 1 is hidden between the two halves of the handle 2 and 3. When opening, the halves of the handle 2 and 3 rotate 180 degrees in opposite directions relative to blade 1, exposing it, and, connecting, form a handle. Both halves of the handle 2 and 3 of the butterfly knife are held by the latch 9 with the nut 10.

To open the butterfly knife, it is turned with a safe handle towards you. In this case, all fingers, except for the thumb, should lie on the handle 2 or 3.

Further, with a sharp movement, the butterfly knife is turned so that the index finger is on the safe handle 2 or 3 on the right side, and all other fingers are in the same place.

After that, the lower part of the butterfly knife is lowered so that it is free.

Next, you need to raise your hand up and slightly move it forward. Due to this movement, the lower part of the butterfly knife will be on the hand, and blade 1 will go under the arm.

With a quick movement, the handle is covered from below, but at the same time the thumb should be held a little higher.

After that, the hand is sharply raised up and the thumb is removed, after which both halves of the handle 2 and 3 will be connected.

To close the butterfly knife, you need to turn it with the blade away from you, while throwing one of the halves of the handle 2 or 3 onto your index finger. Next, the blade 1 is lowered down, holding the handle on the sides. It remains only to make one sharp movement to return both halves of the handle to its original position.

The location of the blade 1 between halves 2 and 3 of the handle allows for inertial opening and closing of the butterfly knife with a turn of both halves 2 and 3 of the handles 180 degrees in opposite directions relative to the blade 1, exposing or closing it.

The execution of each of the halves 2 and 3 of the handle in the cross section of the U-shaped profile, the edges of the side shelves of which are facing the blade 1, ensures the safe location of the blade 1 in the folded state.

The hinged connection of each of the halves 2 and 3 of the handle with the upper part by means of screws 4 and washers 5, for example, copper, with the proximal part of the blade 1, makes it possible to exclude direct friction of the halves 2 and 3 of the handle with the blade 1, thereby ensuring not only the smoothness of inertial opening butterfly knife with a wave of one hand, but also the reliability of the butterfly knife due to the preservation of the original dimensions of the butterfly knife parts and the gaps between the rubbing surfaces of the parts.

The presence of the latch 9, installed spring-loaded in the grooves 6 and perpendicular to the longitudinal axes of symmetry of the halves 2 and 3 of the handle, provides reliable fixation of the closed position of the handles 2 and 3, with the blade 1 located between them.

The execution of one side of the nut 10 of a conical shape, screwed onto the threaded part of the latch 9, and directed by the mentioned conical side towards the groove 6 of the handle 2, allows fixing both halves 2 and 3 of the handles with the required force, preventing spontaneous unscrewing of the nut 10, which eliminates spontaneous opening knife.

The presence in the lower part of the blade 1 along the axis of symmetry of the cylindrical limiter 12, the ends of which protrude beyond the surface of the blade in both directions, ensure that the travel of each halves 2 and 3 of the handle is limited when they are rotated 180 degrees, which eliminates unwanted bending of the blade 1 relative to the handle and, This will prevent damage to the knife.

Execution along the longitudinal axes of symmetry of the blade 1 and each half of the handle 2 and 3 through holes 13, 14, 15 and 16 achieve a balanced state of the blade 1 in relation to each of the halves of the handles 2 and 3 and achieve the mass of the blade 1 equal to 1/2 of the mass of one half handles 2 or 3. Balancing the elements of the knife eliminates the occurrence of backlash at the hinged joints of the blade 1 and halves 2 and 3 of the handles.

The use of a butterfly knife provides not only an increase in reliability by maintaining the original dimensions of the butterfly knife parts and gaps between the rubbing surfaces of the parts, but also an improvement in the convenience of practicing flipping tricks due to the smooth inertial opening of the butterfly knife with a wave of one hand.

Claims (5)

1. Butterfly knife containing a blade, including the proximal and distal parts, a limiter is mounted on the proximal part of the blade and halves of the handle are pivotally mounted, in which longitudinal grooves are made with the possibility of locating the blade in them in the folded state of the knife, the handles are connected to each other by a latch that differs the fact that the hinged connection of the handle halves is made by a detachable screw connection, while washers are mounted between the blade and the handle halves on the screw on both sides relative to the blade, and the latch is spring-loaded, equipped with a nut and, in the unfolded state of the knife, is located along the longitudinal axis of symmetry of the said half handle, and in the folded state of the knife, the latch is located in the grooves perpendicular to the longitudinal axes of symmetry of each half of the handle, and one side of the nut has a conical part and is directed by the mentioned conical part towards the groove of the handle, and a corrugated surface is made along the periphery of the nut, in the blade and half On the sides of the handle, through holes are made to balance the mass of the blade and the handle, so that the center of mass of the knife is located at the point of the hinged connection of the blade with the halves of the handle. 2. Butterfly knife according to claim 1, characterized in that the blade is made pointed. 3. Butterfly knife according to claim 1, characterized in that the distal part of the blade is made of a semicircular shape, and the blade of the blade on each side is made of an arcuate shape, conjugated with the distal part of the blade. 4. Butterfly knife according to claim 2, characterized in that the through holes that balance the mass of the blade and handle are made symmetrically with respect to the longitudinal axes of symmetry of the blade and halves of the handle. 5. Butterfly knife according to claim 2, characterized in that the through holes are made of different sizes.

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