RU2767798C1 - Synchronization device for unwinding blocks of tension cables of elastic elements of a compound bow when fired - Google Patents

Abstract

FIELD: weaponry.SUBSTANCE: device for synchronizing the unwinding of blocks of tension cables of elastic elements of a compound bow (DSU BTC EE CB) during firing contains two synchronizing rollers cross-connected with each other by a synchronization cable. One of the rollers is rigidly fixed on the rotation shaft of the cable tension unit (CTU) of the upper elastic element (EE), and the other is fixed on the rotation shaft of the CTU of the lower EE. The rotation shafts of the corresponding CTU are installed in the bearings of the upper and lower supports. The supports are fixed on the corresponding upper and lower ends of the rigid body of the bow from its rear side. The free ends of the tension cables of the upper and lower CTU are equipped with hooks for connecting these cables with the elastic ends of the lower and upper EE, respectively, and with the possibility of tensioning the latter from the front side of the bow.EFFECT: increasing the accuracy of shooting and the reliability of hitting the target.3 cl, 5 dwg

Description

Technical field

The invention relates to parts of compound bows, specifically to a synchronization device for unwinding (USR) blocks of tension cables (BNT) of elastic elements (UE) of a compound bow (BL) when fired.

State of the art

Invented in the late 60s of the last (twentieth) century in the United States, the compound bow ("compound bow" - compound - composite (English) bow) quickly won recognition from sports shooters and hunters. Compared to traditional bows, which have changed little over twelve millennia of their history, a new type of ancient throwing weapon has a number of undeniable advantages that have made it possible to significantly improve, in the language of military reference books, its tactical and technical characteristics (TTX).

Improving the performance characteristics of compound bows (BC) in terms of stabilizing the synchronous rotation of tension cable blocks (BNT) of elastic elements (UE) of a compound bow (BL) when fired according to [RU 2499969, US 2019226793, Barnett Vengeance Crossbow hunting crossbow (https://www. liveinternet.ru/users/shalygin/] achieved thanks to:

- introduction and installation of synchronizing rollers on blocks of tension cables (BNT), installed moving ends of UE BL and tightening them together;

- introduction of a synchronization cable for cross-connection of the synchronization rollers of the upper and lower movable BNT.

Such an implementation of the unwinding synchronization device (USR) ensures synchronous unwinding of the BNT and its tension cables UE of a compound bow (BL) when fired.

However, due to the installation of the BNT and its synchronizing rollers on the moving ends of the UE and, as a result, due to the change in the distance between the rollers when the UE is straightened during the shot, it leads to the fact that the unsynchronized extension of the bow arms is superimposed on the non-synchronous change in the distance between the synchronizing rollers of adjacent BNT . As a result, the center of the bowstring, connected by its ends with the movable BNT, moves up and down during the straightening of the UE of the bow shoulders. In addition, when the UE is straightened, not only the unsynchronized straightening of the UE relative to each other along the bowstring axis occurs, but also the rolling of the BNT along the axis of the shaft, which leads to the movement of the bowstring to the right and left relative to the long axis of the bowstring. Thus, during the shot, the end of the arrow associated with the bowstring is affected by up-down and right-left vibrations. Accordingly, the shank of the arrow, fixed in the center of the string, during the shot, also moves up and down and left and right.

These movements of the center of the bowstring lead to extremely harmful vibrations and vibrations of the arrow, which continue after the arrow has left the bowstring and the body of the bow. In turn, the oscillation and vibration of the boom during flight lead to an increase in the influence of wind and other external factors on the trajectory and flight time of the boom. As a result of this, the arrows are scattered, reducing its energy and flight range.

It is desirable to develop the USR BNT UE for BL, free from these shortcomings.

Such USR BNT UE for BL, excluding fluctuations and vibration of the shank of the arrow when fired, in the prior art has not been identified.

Formulation of the problem

The objective of the invention is to create a previously unknown USR BNT UE for BL, excluding fluctuations and vibration of the arrow shank when fired.

The technical result achieved by creating the USR BNT UE for a compound bow (BL) is to increase the accuracy of archery and the reliability of hitting a target.

The essence of the invention

The solution of the problem and, as a result, the achievement of the claimed technical result is ensured by the fact that the synchronization device for unwinding (UCR) of the blocks of tension cables (BNT) of the elastic elements (UE) of the compound bow during firing contains two synchronizing rollers cross-connected with each other by a synchronization cable. One of the rollers is rigidly fixed on the rotation shaft of the tension unit (BNT) of the cable of the upper elastic element (UE), and the other - on the rotation shaft of the BNT of the lower UE. The rotation shafts of the corresponding BNT are installed in the bearings of the upper and lower supports. The supports are made with the possibility of their fastening on the corresponding upper and lower ends of the rigid body of the bow from its rear side. The free ends of the tension cables of the upper and lower BNT are equipped with hooks for connecting these cables with the elastic ends of the lower and upper UE, respectively, and with the possibility of tensioning the latter from the front side of the bow.

Proof of achievement of the claimed technical result

The supply of the unwinding synchronization device (RSD) with two BNT supports on the upper and lower ends of the rigid body of the bow from its rear side makes it possible, in contrast to the known USRs based on the flexible ends of the UE, to exclude the displacement of the rotation axes of the BNT between themselves when pulling and lowering the bowstring and associated with by the specified offset, the vertical vibration of the bowstring, by fixing both ends of the shaft on one rigid plane, to exclude the displacement of the bowstring to the right and left.

The provision of free ends of the tension cables with hooks allows direct connection of the BNT cables with the flexible ends of the upper and lower UE bows. This eliminates the fluctuations of the flexible ends associated with the weight load on them of the BNT of the known USR and the transmission of these vibrations to the bowstring.

In general, these technical advantages of the proposed USR make it possible to reduce the amplitude of oscillations and the vibration frequency of the arrow shank during firing to almost zero. Reducing the amplitude of oscillations and vibration frequency of the arrow shank, in turn, leads to a decrease in the dependence of the arrow flight on external destabilizing factors affecting the flight of the arrow in the atmosphere, including density, humidity, air pressure, precipitation, wind speed and direction. The result of the decrease in this dependence is a decrease in air resistance to the flight of an arrow, which leads to a decrease in the dispersion of arrows, an increase in the range of their flight and an increase in their energy in the final section of their flight trajectory.

As a result of such advantages of the claimed design of the USR BNT UE, an overwhelmed technical result is achieved, which consists in increasing the accuracy of shooting and the reliability of hitting the target.

Link to drawings

The essence of the invention is illustrated by the drawings shown in Fig. 1-5.

In FIG. 1 shows a figure illustrating an example of the design of a device for synchronizing the unwinding (USR) of blocks of tension cables (BNT) of elastic elements (UE) of a compound bow (BL) when fired. In FIG. 2 - fig. 3, respectively, side and top view of the block of tension cables (BNT) USR. In FIG. 4 - fig. 5 is an example of installing the USR on a crossbow with a pistol stock and on a crossbow with a gun stock, respectively.

In figures 1-5, the position numbers indicate:

1 - synchronization device for unwinding (USR) blocks of tension cables (BNT) of elastic elements (UE) of a compound bow when fired:

1.1 - block of tension cables (BNT) USR:

1.1.1 - BNT rotation shaft;

1.1.2 - bearing;

1.1.3 - bearing support;

1.1.4, 1.1.5, 1.1.6 - tension rollers for the bowstring, UE tension cable and synchronization cable, respectively;

1.2, 1.3, 1.4 - bowstring, tension cable UE and synchronization cable, respectively;

1.5 - hook, connecting element of the free end of the tension cable with the flexible end of the elastic element (UE);

2 - elastic element (UE - potential energy accumulator) of the bow;

3 - hard body of a compound bow (BL):

3.1 - the upper end of the bow body;

3.2 - the lower end of the bow body;

4, 5 - pistol and rifle stock of a crossbow with BL, respectively.

Disclosure of the essence of the invention

According to Figs 1-5, the synchronization device for unwinding (USR) blocks of tension cables (BNT) of elastic elements (UE) of a compound bow when fired contains two synchronizing rollers 1.1.6, cross-linked by a synchronization cable 1.4. One of the rollers 1.1.6 is rigidly fixed on the shaft 1.1.1 of rotation of the block 1.1 of the tension (BNT) of the cable of the upper elastic element (UE) 2, and the other is on the shaft 1.1.1 of rotation of the BNT 1.1 of the lower UE 2. Shafts 1.1.1 of rotation of the corresponding BNT installed in bearings 1.1.2 of the upper and lower bearings 1.1.3. The supports are made with the possibility of their fastening on the corresponding upper 3.1 and lower 3.2 ends of the rigid body 3 of the bow from its rear side. The free ends of the tension cables 1.3 of the upper and lower BNT 1.1 are equipped with hooks 1.5 for connecting these cables 1.3, respectively, with the elastic ends of the lower and upper UE 2 and with the possibility of tensioning the latter from the front side of the bow.

At the same time, the hooks 1.5 are made in the form of loops, knots or lanyards, and the elastic elements (UE) 2 are in the form of springs, elastic plates, hydraulic, pneumatic or magnetic storages of potential energy of tension UE 2.

The operation of the device for synchronizing the unwinding of blocks of tension cables of elastic elements of a compound bow

The operation of the untwisting synchronization device 1 (USR) of tension cable blocks (BNT) 1.1 of elastic elements (UE) 2 of a block bow when fired is considered using the example of the use of USR in a block bow with flat UE.

Before starting USR 1, BNT 1.1 is installed on the upper 3.1 and lower 3.2 end of the hard body 2 of the bow by attaching their supports to the corresponding ends on the back side of the hard body 3 of the bow, for example, by screw or bolt connection (not shown in the figures). In the process of fastening the BNT 1.1, their rollers 1.1.6 of the upper and lower BNT 1.1 are interconnected by a cross cable 1.4 of synchronization.

After rigid fastening of BNT 1.1 on the upper 3.1 and lower 3.2 end of the rigid body 2 of the bow, the traction ends of the cables 1.3 are connected with hooks 1.5 to the elastic ends of the lower and upper UE 2 located on the front side of the bow.

After installing the USR 1 on a compound bow, they begin to use it when shooting from a bow.

To do this, an arrow is placed on the aiming shelf of the bow and its shank is captured with a clip (not shown in the figures) of the bowstring 1.2. Next, pull the bowstring 1.2. At the same time, due to the tension of the string 1.2 (Fig. 1), the synchronous rotation of the rollers 1.1.4 on both shoulders of the bow occurs due to the combination of rollers 1.1.6 synchronizing the various arms with a cross cable 1.4 synchronizing a fixed length. At the same time, due to the rigid connection of the shaft 1.1.1 BNT 1.1 of these rollers 1.1.4 and 1.1.6 with the tension roller 1.1.5, the traction cables 1.3 are wound onto the tension rollers 1.1.5. At the same time, due to the reduction in the length of the traction cables 1.3, the elastic elements of the UE 2 of both arms of the bow are tensioned. At the time of the shot, the bowstring 1.2 is released, the elastic elements 2 straighten out and through the cables 1.3 synchronously (due to the combination of rollers 1.1.6 synchronizing the upper and lower BNT 1.1 with a cross cable 1.4 synchronization of a fixed length) unwind the BNT 1.1 of both shoulders of the bow body in the opposite direction. When this occurs, the synchronous winding of both ends of the bowstring 1.4 on the corresponding rollers 1.1.4. Due to the synchronous rotation of the rollers 1.1.4 of both shoulders 3.1, 3.2 of the rigid body of the bow, when the UE 2 is straightened, a vibration-free translational movement of the center of the bowstring 1.2 and the arrow shank clamped in it in the direction of the shot occurs. As a result of such a shot, the shank of the arrow comes out of the bow without vibration and does not vibrate during the flight. Due to this, the impact on the arrow of external factors (wind, precipitation, temperature) is reduced, the spread of the trajectories of the movement of arrows is reduced, the accuracy of archery, the energy of the arrow and the range of its flight are increased.

USR 1 works in a similar way in compound bows with UE 2 in the form of springs, elastic plates, hydraulic, pneumatic or magnetic storages of potential energy of tension UE 2.

Industrial Applicability

The invention has been developed at the level of a technical project. A prototype of the device 1 for synchronization of unwinding (USR) of blocks of tension cables (BNT) 1.1 of elastic elements (UE) of 2 compound bows during firing has been developed. Tests of the prototype showed the possibility of its use in compound bows (BL) and the achievement of the claimed technical result. Marketing documents and proposals are being prepared for the serial development of USR 1 BNT 1.1 UE 2 for hunting and sporting BL and crossbows with pistol 4 and rifle 5 stocks.

Claims (3)

1. A device for synchronizing the unwinding of blocks of tension cables of elastic elements of a compound bow when fired, characterized in that it contains two synchronizing rollers cross-connected with each other by a synchronization cable, one of the rollers is rigidly fixed to the rotation shaft of the tension block (BNT) of the cable of the upper elastic element ( UE), and the other - on the rotation shaft of the BNT of the lower UE, the rotation shafts of which are installed respectively in the bearings of the upper and lower supports, made with the possibility of their fastening on the corresponding upper and lower ends of the rigid body of the bow from its rear side, and the free ends of the tension cables of the upper and lower BNT are equipped with hooks for connecting said cables with the elastic ends of the lower and upper UE, respectively, and with the possibility of tensioning the latter from the front side of the bow. 2. The synchronization device according to claim 1, characterized in that the hook is made in the form of a loop, knot or lanyard. 3. Synchronization device according to claim 1, characterized in that the elastic elements (UE) are made in the form of springs, elastic plates, hydraulic, pneumatic or magnetic accumulators of the potential energy of tension of the UE.

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