Device for Synchronizing the Unwinding of Blocks of Tension Cables of Resilient Elements of a Compound Bow During Shooting

Abstract

A device for synchronizing unwinding of tensioning cable units on resilient elements of a compound bow during firing comprises two synchronizing rollers connected to each other by a synchronizing cable. One of the rollers is attached to a rotation shaft of a tension cable block of an upper resilient member, and the other roller is connected to a rotation shaft of the tension cable blocks of a lower resilient element. Each rotation shaft is mounted in bearings provided in upper and lower supports. The shafts and/or supports are fastened to the respective upper and lower ends of a rigid body of the bow from the rear side thereof. Free ends of the tension cables of the upper and lower tension cable blocks are provided with a connecting/engaging element for connecting the cables to the resilient ends of the lower and upper resilient elements for tensioning the resilient elements from the front side of the bow.

Description

FIELD OF THE TECHNOLOGY

The invention relates to the field of compound bows in general, and specifically relates to a device for synchronizing the unwinding (USR) blocks of tension cables (BNT) of resilient elements (UE) of a compound bow (BL) during shooting.

BACKGROUND OF THE INVENTION

Invented in the late 60s of the twentieth century in the USA, the compound bow (“compound bow”) quickly gained recognition among sport shooters and hunters. Compared to traditional bows, which have changed little over the twelve thousand years of their history, the 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 (TTC).

According to Russian patent RU 2499969 and US Patent Publication 2019226793 improvement of the performance characteristics of the compound bows (CB) relayed to stabilizing the synchronous rotation of tension cable blocks (BNT) of resilient elements (UE) of a compound bow (BL) when fired can be achieved in view of the following:

• • introduction and providing synchronizing rollers on blocks of tension cables (BNT), installed at the moving ends of the resilient elements of the compound bow (UE BL) and tightening them together;
  • introduction of a synchronization of a cable for cross-connecting the synchronizing rollers of the upper and lower movable tension cable blocks (BNT).

This design of the unwinding synchronization device (USR) assures synchronous unwinding of the tension cable blocks (BNT) and its tension cables (UE) of the compound bow (BL) when fired.

However, due to installation of the tension cable block (BNT) and the respective synchronizing rollers on the moving ends of the resilient element (UE) might result in the change of the distance between the rollers when straightening the resilient_element (UE) during a shot. This leads to the fact that the unsynchronized straightening of the arms of the bow is superimposed on the non-synchronized change in the distance between the synchronizing rollers of adjacent tension cable blocks (BNT).

As a result, the center of the string connected at its ends to the movable tension cable blocks (BNT), moves up and down during the straightening of the resilient element UE of the bow arms. In addition, when the resilient elements (UE) are straightened, there is not only an unsynchronized straightening of the resilient element (UE) relative to each other along the bowstring axis, but also rolling of the tension cable blocks (BNT) along the shaft axis. This results in right-to-left movement of the bowstring relative to the extended bowstring axis.

Thus, during the shooting the end of the arrow connected to the bowstring is affected by vibrations in up and down and left and right directions. Accordingly, the arrow shank fixed in the center of the bowstring also moves up and down and left and right during the shooting.

These movements of the center of the bowstring result in extremely damaging vibrations and oscillations of the arrow, which continues even after the arrow leaves the bowstring and bow body.

In turn, the oscillation and vibration of the arrow during flight lead to an increase in the influence of wind and other external factors on the trajectory and flight time of the arrow. As a result of the above, the arrows are scattered, reducing their energy and flight range.

In view of the above it is desirable to provide the unwinding synchronization device (USR) for tension cable blocks (BNT) of the resilient elements (UE) for compound bows (BL) free from the above-noted disadvantages.

To the best of the inventor's knowledge, such the unwinding synchronization device (USR) for tension cable blocks (BNT) of the resilient elements (UE) for compound bows (BL), which exclude oscillations and vibration of the arrow shank during firing are not known in the prior art.

OBJECTS OF THE INVENTION

One of the main objects of the invention is to create a previously unknown the unwinding synchronization device (USR) for tension cable blocks (BNT) of the resilient elements (UE) for compound bows (BL), which eliminates oscillations and vibration of the arrow shank when fired.

The technical result of the invention is achieved by providing the above-noted the unwinding synchronization device (USR) for tension cable blocks (BNT) of the resilient elements (UE) for compound bows (BL) which increases the accuracy of archery and the reliability of hitting a target.

SUMMARY OF THE INVENTION

According to the invention, there is provided the unwinding synchronization device (USR) for tension cable blocks (BNT) of the resilient elements (UE) for compound bows (BL) which when fired contains two synchronizing rollers which are cross-connected with a synchronization cable.

One of the rollers is rigidly attached to the rotation shaft of the tension block (BNT) of the cable of the upper resilient element (UE), and the other roller is attached to the rotation shaft of the tension cable blocks (BNT) of the lower resilient element (UE).

The rotation shafts of the corresponding tension cable blocks (BNT) are installed in the bearings of the upper and lower supports. The supports are configured to be attached to 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 tension cable blocks are equipped with engagement devices for connecting these cables with the resilient ends of the lower and upper resilient elements (UE), so that the possibility of tensioning the resilient ends from the front side of the bow is assured.

Providing the unwinding synchronization device (USR) with two tension cable blocks (BNT) supports positioned at the upper and lower ends of the rigid body of the bow on its rear side allows to exclude the displacement of the tension cable blocks (BNT) rotation axes among themselves when tensioning and lowering the bow string and associated with the indicated displacement the vertical vibration of the bowstring. Securing both ends of the shaft on one rigid plane will prevent the bowstring from shifting to the right and left. The above is in contrast to the known_unwinding synchronization devices (USR) with the support on the flexible ends of the resilient elements UE.

Providing the free ends of the tension cables with the engagement arrangements allows direct connection of the tension cable blocks (BNT) cables with the flexible ends of the upper and lower resilient elements (UE) of the bow. This eliminates the vibrations of the flexible ends associated with the weight load on them of the tension_cable blocks BNT of the known unwinding synchronization device (USR) and the transfer of these vibrations to the bow string.

In general, these advantages of the unwinding synchronization device (USR) of the invention make it possible to reduce the oscillation amplitude and vibration frequency of the arrow shank during firing to almost zero.

Reducing the oscillation amplitude and vibration frequency of the arrow shank, in turn, leads to the decrease in the dependence of the arrow flight from 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 reducing this dependence is the decrease in air resistance to the flight of the arrow, which leads to a decrease in the dispersion of the arrows, an increase in their flight range and an increase in their energy at the end of their flight trajectory.

The above discussed advantages of the invention related to the unwinding synchronization device (USR) for tension cable blocks (BNT) of the resilient elements (UE) for compound bows (BL) have resulted in the increase of the shooting accuracy and reliability of hitting the target.

BRIEF DESCRIPTION OF THE DRAWINGS

The essence of the invention is illustrated by the drawings presented in FIGS. 1-5.

FIGS. 1A and 1B illustrate an example of the design of the unwinding synchronization device (USR) of the tension cable blocks (BNT) of the resilient elements (UE) of a compound bow (BL) when fired.

FIGS. 2 and 3 illustrate respectively side and top views of the tension cable block (BNT) of the unwinding synchronization device (USR).

FIGS. 4 and 5 illustrate examples of installation of the unwinding synchronization device (USR) on a crossbow with a pistol stock and on a crossbow with a rifle stock, respectively.

In FIGS. 1-5 the reference numerals indicate as follows:

• • 1 is the unwinding synchronization device (USR) of the tension cable blocks (BNT) of resilient elements (UE) of a compound bow when fired;
    • 1.1 is a block of tension cables (BNT) of the unwinding synchronization device (USR);
    • 1.1.1 is a rotation shaft of the tension cable block (BNT);
    • 1.1.2 is a bearing;
    • 1.1.3 is a bearing support;
    • 1.1.4; 1.1.5; 1.1.6 are tension rollers for the bowstring of tension cable
    • (UE) and synchronization cable, respectively;
    • 1.2, 1.3, 1.4 are bowstring, tension cable of the resilient element (UE) and the synchronization cable, respectively;
    • 1.5 is a connecting element of the free end of the tension cable with the flexible end of the resilient element (UE);
  • 2 is the resilient element-potential energy storage (UE) of the bow;
  • 3 is a rigid compound bow body (BL);
    • 3.1 is an upper end of the bow body;
    • 3.2 is a lower end of the bow body;
  • 4 and 5 are pistol and rifle stocks of a crossbow with the compound bow body (BL), respectively.

DETAILED DESCRIPTION OF THE INVENTION

According to FIGS. 1-5, the synchronization device for unwinding (USR) of blocks of tension cables (BNT) of resilient elements (UE) of a compound bow when fired (during firing) contains two synchronizing rollers 1.1.6 which are cross connected with each other by the synchronization cable 1.4.

One of the rollers 1.1.6 is rigidly provided on the shaft 1.1.1 of rotation of the tension cable block 1.1 (BNT) of the upper resilient element (UE) 2, and the other roller 1.1.6 is disposed on the shaft 1.1.1 of rotation of the tension cable block BNT 1.1 of the lower resilient element (UE) 2.

The rotation shafts 1.1.1 of the corresponding tension cable blocks (BNT) are installed in bearings 1.1.2 of the upper and lower supports 1.1.3. The supports are configured to be attached to 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 tension cable blocks (BNT) 1.1 are equipped with the connecting/engaging elements 1.5 for connecting the cables 1.3 with the resilient ends of the lower and upper resilient elements, respectively (UE) 2 to provide tensioning of the resilient elements from the front side of the bow.

In this case, the connecting elements 1.5 are made in the form of loops, nodes or lanyards, and the resilient elements (UE) 2 are in the form of springs, resilient plates, hydraulic, pneumatic or magnetic accumulators of potential energy of tension of the resilient elements (UE) 2.

Operation of the Device for Synchronizing the Unwinding of Blocks of Tension Cables of Resilient Elements of a Compound Bow

The operation of the device 1 for synchronizing the unwinding (USR) of tension cable blocks (BNT) 1.1 of resilient elements (UE) 2 of a compound bow during shooting is described using the example of using the unwinding synchronization device (USR) of the compound bow with the flat resilient elements (UE).

Before starting the operation of the unwinding synchronization device 1 (USR), the tension cable blocks (BNT) 1.1 are installed on the upper 3.1 and lower 3.2 ends of the rigid bow body 2 by attaching their supports to the corresponding ends on the rear side of the rigid bow body 3. This can be accomplished by using for example, screw or bolt connections (not shown in the drawings).

In the process of fastening tension cable blocks (BNT) 1.1 their rollers 1.1.6 of the upper and lower tension cable blocks 1.1 are connected to each other by the cross-synchronization cable 1.4.

After the tension cable block (BNT) 1.1 is rigidly attached to the upper 3.1 and lower 3.2 ends of the rigid body 2 of the bow, the connecting/engagement elements 1.5 connect the pull ends of the cables 1.3 to the resilient ends of the lower and upper resilient elements (UE) 2 located at the front side of the bow.

After installation of the unwinding synchronization device USR 1 on the compound bow, begin to use the bow in archery.

To do this, an arrow is placed on the sighting shelf of the bow and its shank is grabbed by a clamp (not shown in the drawings) of the bowstring 1.2. After that the string 1.2 is pulled.

In this case, due to the tension of the bowstring 1.2 (FIG. 1), synchronous rotation of the rollers 1.1.4 occurs on both arms of the bow. This is due to the connection of the rollers 1.1.6 synchronizing the different arms with a cross-synchronization cable 1.4 having a fixed length.

At the same time, due to the rigid binding by the shaft 1.1.1 of the tension cable block (BNT) 1.1 of the rollers 1.1.4 and 1.1.6 with the tensioning roller 1.1.5, the traction or pulling cables 1.3 are wound onto the tensioning rollers 1.1.5.

In this case, due to the reduction in the length of the traction or pulling cables 1.3, the resilient elements (UE) 2 of both arms of the bow are tensioned. At the moment of shooting, the bowstring 1.2 is released, the resilient elements 2 are straightened and through the cables 1.3 synchronously the tension cable block (BNT) 1.1 of both arms of the bow body is untwisted in the opposite direction. This occurs due to the connection of the rollers 1.1.6 synchronizing the upper and lower tension cable blocks (BNT) 1.1 with a cross-synchronization cable 1.4 of the fixed length.

In this case, both ends of the bowstring 1.4 are simultaneously wound onto the corresponding rollers 1.1.4. Due to the synchronous rotation of the rollers 1.1.4 of both arms 3.1 and 3.2 of the rigid body of the bow, when straightening the resilient element (UE) 2, a vibration-free forward motion of the center of the bowstring 1.2 and the arrow shank clamped there occurs in the direction of the shot.

As a result of such shots, the arrow shank leaves the bow without vibration and also does not vibrate during flight. In view of the above, the impact of external factors on the arrow (wind, precipitation, temperature) is reduced, the spread of arrow trajectories is reduced, the accuracy of archery, the energy of the arrow and its flight range are increased.

The unwinding synchronization device (USR) 1 operates in a similar manner in the compound bows with the resilient element (UE) 2 in the form of springs, resilient plates, hydraulic, pneumatic or magnetic storage of potential tension energy of resilient element (UE) 2.

Claims

1. A device for synchronizing unwinding of tensioning cable units of resilient elements of a compound bow during shooting, comprising: two synchronizing rollers interconnected to each other by a synchronizing cablelements respectively is attached to a rotation shaft of a tension cable block of the cable of an upper resilient element, and another of said rollers is connected to a rotation shaft of the tension cable blocks of a lower resilient element, each said rotation shaft is installed respectively in bearings of upper and lower supports, said shafts are being fastened to corresponding upper and lower ends of a rigid body of the bow from a rear side thereof, wherein free ends of the tension cables of the upper and lower tension cable blocks are provided with a connecting/engaging element for connecting said cables to the resilient ends of the lower and upper resilient elements respectively for tensioning said resilient elements from the front side of the bow.

2. The device according to claim 1, wherein said connecting/engaging element is formed of a loop, a knot or a turnbuckle.

3. The device according to claim 1, wherein the flexible elements can be selected from the group comprising springs, resilient plates, hydraulic, pneumatic or magnetic accumulators of potential energy of the resilient elements tension.