WO2023285847A1

WO2023285847A1 - Strap winding apparatus for devices carried on a carrying strap

Info

Publication number: WO2023285847A1
Application number: PCT/HU2022/000009
Authority: WO
Inventors: Péter SZABÓ
Original assignee: Szabo Peter
Priority date: 2021-07-12
Filing date: 2022-07-07
Publication date: 2023-01-19
Also published as: HU5371U

Abstract

Present invention relates to a strap winding apparatus for devices carried on a carrying strap, particularly for weapons suitable for shooting projectiles and having a stock, which has a strap (12) with a first end (12a) connected to the first connection part (I la) of the base body (11) of the device (10) and a second end (12b) connected to the second connection part (l ib) of the base body (11) of the device (10), a pull-back unit (30) is interposed between the first end (12a) of the strap (12) and the first connection part (11a) of the base body (11) of the device (10), the pull-back unit (30) has a strap-holder housing (31) with a storage space (32), a reel element (33) that rotates around its rotation shaft (33a) in the storage space (32), a back-rotation device (34) connected to the reel element (33) and a strap movement regulation part-unit (35) are fitted into the storage space (32), the first end (12a) of the strap (12) is connected to the reel element (33) either directly or via an intermediate piece (12c). The characteristic feature of the invention is that a holding unit (20) is interposed between the second end (12b) of the strap (12) and the second connection part (1 lb) of the base body (11) of the device (10), where the holding unit (20) has a housing (21) at the second connection part (11b) of the base body (11) of the device (10) at least partly recessed into the base body (11) and a receipt space (22), a connection pin (23) that may be connected to the second end (12b) of the strap (12) and that may be fitted into and removed from the receipt space (22) of the housing (21), and a locking part-unit (24) serving for securing the connection pin (23) in the receipt space (22) of the housing (21), while the strap-holder housing (31) of the pull-back unit (30) is at least partly recessed into the base body (11) at the first connection part (11a) of the base body (11), and with the pull-back unit (30) in its basic position at least a part of the strap (12) is wound onto the reel element (33), and so it is pulled back into the storage space (32) of the strap-holder housing (31) located inside the base body (11).

Description

Strap winding apparatus for devices carried on a carrying strap

The subject of the invention relates to a strap winding apparatus for devices carried on a carrying strap, particularly for weapons suitable for shooting projectiles and having a stock, which has a strap with a first end connected to the first connection part of the base body of the device and a second end connected to the second connection part of the base body of the device, a pull-back unit is interposed between the first end of the strap and the first connection part of the base body of the device, the pull-back unit has a strap-holder housing with a storage space, a reel element that rotates around its rotation shaft in the storage space, a back-rotation device connected to the reel element and a strap movement regulation part-unit are fitted into the storage space, the first end of the strap is connected to the reel element either directly or via an intermediate piece.

Carrying straps, slings have been used for carrying devices used for shooting projectiles and getting them to targets, such as, for example, projectile weapons having a stock, airguns, bows, crossbows, when out of use for a long time, with which the device may be carried on the shoulder or on the back. Many solutions have been created to date for the easier operation of carrying straps and for their multipurpose use r.

Patent specification registration number US 9.194.655 discloses a firearm carrying device into which the weapon itself may be inserted, and the device may be connected to a backpack thereby unifying the burden that must be carried by the user. The advantage of the solution is that the carrying device may also be used in the case of firearms of varying length, and so different weapons may be carried with the device on different occasions. Its disadvantage, however, is that it is difficult to handle, which significantly hinders fast preparation of the weapon and bringing it into a state ready to fire.

Publication document number US2004/0188476 discloses a carrying strap that may be used for weapons carried on the shoulder the length of which may be changed quickly and quietly. The disadvantage of the solution, however, is that only the length of the carrying strap may be changed, but when the weapon is in use position and during storage the strap hangs freely next to the weapon, which may make it difficult to use.

Publication document number US2005/0091902 also presents a solution a version of which has a pull-back device built into the carrying strap. The carrying strap is connected to the pull-back device, and using this the length of the carrying strap may be temporarily “extended”, then shortened once again. However, the disadvantage of this design is also that with the pull-back device in its basic state, i.e. with the carrying strap in pulled back state, the carrying strap still hangs down beside the firearm and this may cause a problem during handling and storage.

Overall it may be determined that the carrying straps currently in use do not make it possible for them to only appear as a part of the weapon while the weapon is being carried on the shoulder and that they do not hang down beside the weapon during storage or even during use and so not obstruct the gripping of the weapon, aiming or even picking up the weapon front its storage position.

The objective with the invention was to overcome the deficiencies of the known carrying strap solutions and to create a version that makes it possible, with the exception of the case when the portable device, particularly a weapon is carried on the shoulder, for the carrying strap not to hang down beside the portable device and when necessary to be able to remove it quickly, simply and quietly from the external environment of the portable device in such a way that it does not obstruct the user during use, however, after the weapon has been used it should be possible to easily, quickly and quietly restore the carrying state, i.e. to provide the portable device with a strap once again.

The recognition that led to the construction according to the invention was that if in an unconventional way a unique connection apparatus is fitted between the first end of the strap and the portable device, the first part of which connected to the strap may be easily and quickly released from its second piece secured to the portable device, while a novel pull-back unit is connected to the second end of the strap which may be embedded into the portable device so that the part of the connection apparatus connected to the strap may be essentially “hidden” in the pull-back unit fitted in the portable device, then the strap only constitutes a visible and usable part of the portable device when the part of the connection apparatus connected to the strap is secured to the connection apparatus, while when it is not in this state it is no even visible, and so the task may be solved.

In accordance with the set objective the strap winding apparatus according to the invention for devices carried on a carrying strap, particularly for weapons suitable for shooting projectiles and having a stock, - which has a strap with a first end connected to the first connection part of the base body of the device and a second end connected to the second connection part of the base body of the device, a pull-back unit is interposed between the first end of the strap and the first connection part of the base body of the device, the pull-back unit has a strap-holder housing with a storage space, a reel element that rotates around its rotation shaft in the storage space, a back-rotation device connected to the reel element and a strap movement regulation part-unit are fitted into the storage space, the first end of the strap is connected to the reel element either directly or via an intermediate piece, - is set up in such a way that a holding unit is interposed between the second end of the strap and the second connection part of the base body of the device, where the holding unit has a housing at the second connection part of the base body of the device at least partly recessed into the base body and a receipt space, a connection pin that may be connected to the second end of the strap and that may be fitted into and removed from the receipt space of the housing, and a locking part-unit serving for securing the connection pin in the receipt space of the housing, while the strap-holder housing of the pull-back unit is at least partly recessed into the base body at the first connection part of the base body, and with the pull-back unit in its basic position at least a part of the strap is wound onto the reel element, and so it is pulled back into the storage space of the strap- holder housing located inside the base body.

A further feature of the strap winding apparatus according to the invention may be that the locking part-unit of the holding unit has a moving locking piece and a stationary support piece, where the stationary support piece has a hook extension, the connection pin has a linking piece fitted to the hook extension of the stationary support piece and cooperating with it, and with the locking part-unit of the holding unit in locked position the linking piece of the connection pin is held between the hook extension of the stationary support piece and the moving locking piece, and a securing piece is interposed between the housing and the moving locking piece.

In the case of a different version of the strap winding apparatus an energy-storing return element is inserted between the moving locking piece and the housing. Optionally the energy-storing return element is a coil spring.

In the case of another different embodiment of the invention the back-rotation device has a coil spring, the first end of the coil spring is secured to the reel element, and the second end of the coil spring is linked to the strap-holder housing, and at least a part of the coil spring is wound onto the reel element.

In the case of yet another different embodiment of the strap winding apparatus the back- rotation device has a spring-holder shaft that may be rotated as compared to the strap- holder housing, at one of it ends a coil spring secured to the spring-holder shaft and partially wound onto the spring-holder shaft, as well as a first torque-transfer piece secured to the spring-holder shaft, while the reel element is provided with a second torque-transfer piece cooperating with the first torque-transfer piece, and in this way the reel element and the spring-holder shaft with the help of the first torque-transfer piece and the second torque-transfer piece have a positive mechanical engagement between each other, and the second end of the coil spring is connected to the strap-holder housing. Optionally a speed control element is interposed between the spring-holder shaft and the strap-holder housing.

From the point of view of the invention it may be preferable if it is provided with a strap movement regulation part-unit, where the strap movement regulation part-unit has a rotation-direction limiting element and a release switch for disabling the rotation-direction limiting element, as well as a rotation prevention piece and a switch for securing the rotation prevention piece, the rotation-direction limiting element is formed by a shaped profile disc secured to the reel element, while the release switch has a handle piece that may be tilted as compared to the strap-holder housing, the rotation prevention piece is also a disc secured to the reel element and provided with holding seats, and the switch has a locking piece that may be tilted compared to the strap-holder housing and a head fitting into the individual holding seats. In the case of another version of the strap winding apparatus a strap-braking part-unit is positioned in the receipt space of the housing, where the strap-braking part-unit has a stationary brake pad and a moving brake pad coupled with this, the strap runs between the stationary brake pad and the moving brake pad, and the moving brake pad is connected to a disengaging switch. Optionally the switch of the strap movement regulation part-unit and the disengaging switch of the strap-braking part-unit constitute a single unit.

The strap winding apparatus according to the invention has numerous preferable characteristics. The most important of these is that the joint use of the novel holding unit and the unconventionally located pull-back unit makes it possible to quickly, simply and quietly hide the entire strap in the housing of the pull-back unit in such a way that it does not disturb the use of the portable device, and does not cause any problems when it is stored or moved either, however setting the strap into carrying position may be performed quickly, simply, quietly and safely.

The advantage originating from this is that in the case of firearms, especially those used for hunting, placing the weapon into the state ready for firing may be performed noiselessly in such a way that the strap does not hang under the weapon and so does not obstruct aiming and the use of the weapon. Which may greatly improve the chances of a successful shot.

It is also an advantage that in the case of the suitable construction of the pull-back unit, the length of the strap may be adjusted to the desired size, and may be quickly changed if necessary, which makes the transportation, movement of the portable device on the shoulder more comfortable.

It must also be seen as an advantage that due to its simple structure the strap winding apparatus according to the invention is easy to use, its operation does not require special skills or abilities or practice. And due to its simple operation its use is also safe, which is an aspect of fundamental importance especially in the case of its use with firearms.

In addition another important advantage us that the strap winding apparatus according to the invention may be built into the portable device subsequently, and in this way with a small amount of investment this conventional object becomes much more practical and easier to carry, handle and store.

In the following embodiments of the strap winding apparatus according to the invention are presented in detail with reference to figures, wherein

Figure 1 shows a schematic view of a possible version of the strap winding apparatus according to the invention fitted into a firearm,

Figure 2 shows a side view of a possible version of the holding unit of the strap winding apparatus, in built-in state, in partial cross-section,

Figure 3 shows a side view of a possible version of the pull-back unit of the strap winding apparatus, in built-in state, in partial cross-section,

Figure 4 shows a side view of another version of the pull-back unit of the strap winding apparatus, in built in state, in partial cross-section.

Before presenting the figures in detail it should be noted that in the given case weapons suitable for shooting projectiles and having a stock should not only be understood as meaning firearms, but also air-weapons and bows, and even crossbows, among others. Furthermore, in the case of weapons the stock may be viewed as the base body. But in the context of the specification portable device may also be a skateboard, for example, the base body of which is the body of the board itself on which the user stands while skateboarding.

A version of the strap winding apparatus according to the invention may be seen in figure 1 that is fitted to a hunting rifle constituting the device 10. The strap winding apparatus itself contains the strap 12, the holding unit 20 and the pull-back unit 30. It may be observed that in the case of this embodiment the pull-back unit 30 is located on the first connection part 1 la of the base body 11, i.e. the stock, of the hunting rifle constituting the device 10, in this case on the rear part of the stock on the body side, while the holding unit 20 may be found on the second connection part 1 lb of the base body 11, i.e. the stock, in this case on the forestock side of the stock.

The first end 12a of the strap 12 is connected to the pull-back unit 30, and the second end 12b of the strap 12 is connected to the holding unit 20. The pull-back unit 30 is completely recessed into the first connection part 11a of the base body 11, while the holding unit 20 is partially recessed into the second connection part 1 lb of the base body 11. Figure 1 also shows that the connection pin 23 of the holding unit 20 is secured to the second end 12b of the strap 12, and it may be separated from the other parts of the holding unit 20 embedded into the base body 11.

Figure 2 depicts a possible embodiment of the holding unit 20 fitted into the base body 11 of the device 10. The holding unit 20 consists of two structural units. The one independent part is the connection pin 23, which is secured to the second end 12b of the strap 12 and has a linking piece 23 a. The other independent part of the holding unit 20 is the housing 21 of the holding unit 20, with the other components located in it, which have locations in the receipt space 22 of the housing 21 of the holding unit 20. The housing 21 is built into the second connection part 1 lb of the base body 11.

The locking part-unit 24 may be found in the housing 21, which contains the moving locking piece 24a, the stationary support piece 24b, the securing piece 25 and the return element 26. Here the stationary support piece 24b has a hook extension 24c, which cooperates with the linking piece 23 a of the connection pin 23, and its task is to create a connection between the linking piece 23 a of the connection pin 23 and the stationary support piece 24b of the locking part-unit 24.

The moving locking piece 24a of the locking part-unit 24 is positioned in the housing 21 so that it may slide compared to the stationary support piece 24b, in its longitudinal direction. In the case of the given arrangement the moving locking piece 24a is fitted between the housing 21 and the stationary support piece 24b so that it is the stationary support piece 24b itself that guides the movement of the moving locking piece 24a. The part of the moving locking piece 24a closer to the hook extension 24c leaves the hook extension 24c free when the moving locking piece 24a is in its open terminal position. While in its other, closed terminal position it slides onto the hook extension 24c of the stationary support piece 24b. In this position the moving locking piece 24a, the stationary support piece 24b and its hook extension 24c enclose a space part in which the linking piece 23 a of the connection pin 23 may be locked. This is how the connection pin 23 and the locking part-unit 24 may be linked in a releasable way.

For the purpose of easier comprehension in figure 2 the second terminal position of the moving locking piece 24a is shown with a dashed line, which shows the open position.

The locked terminal position of the moving locking piece 24a is ensured by the securing piece 25, which prevents the moving locking piece 24a from accidentally sliding compared to the housing 21, and the linking piece 23 a being released from the captivity of the moving locking piece 24a and the stationary support piece 24b.

The return element 26 is located at the end of the stationary support piece 24b of the moving locking piece 24a opposite to the hook extension 24c, which forces the moving locking piece 24a from open position to locked position. The return element 26 is preferably a coil spring.

Moving over now to figure 3, this shows a simpler version of the pull-back unit 30. It may be observed that the strap-holder housing 31 of the pull-back unit 30 is entirely recessed into the base body 11, i.e. into the stock, in the first connection part 11a of the base body 11. The reel element 33 is located in the storage space 32 of the strap-holder housing 31, which is able to rotate around the rotation shaft 33a. Here the first end 12a of the strap 12 is secured to the reel element 33, within that to the rotation shaft 33a with the help of the intermediate piece 12c. But it is also possible that the first end 12a of the strap 12 is connected directly to the reel element 33. This depends on the material and design of the reel element 33 and on the material of the strap 12 also.

The back-rotation device 34 is also located in the storage space 32 of the strap-holder housing 31, which in this case in a coil spring 34a. The first end 34b of the coil spring 34a is secured to the reel element 33, here to the rotation shaft 33a, while the second end 34c of the coil spring 34a is secured to the strap-holder housing 31. The coil spring 34a is positioned in the storage space 32 of the strap-holder housing 31 so that it pretensions the reel element 33, and when the strap 12 is pulled out of the storage space 32 of the strap- holder housing 31 of the pull-back unit 30, then as the reel element 33 rotates the coil spring 34a is wound up around the rotation shaft 33a, i.e. tensioning it thereby accumulating strain energy in the coil spring 34a, which after this helps the pulling back of the strap 12.

The strap-braking part-unit 40 may also be found in the storage space 32 of the strap- holder housing 31 of the pull-back unit 30, its task is to regulate the speed of movement of the strap 12 while it is being wound up and out, and, optionally, to secure the strap 12 in the given position when the desired strap 12 length has been reached. In the interest of this in the case of the given embodiment the strap-braking part-unit 40 contains a stationary brake pad 41, a moving brake pad 42, and a disengaging switch 43, which is connected to the moving brake pad 42. The strap 12 is threaded between the stationary brake pad 41 and the moving brake pad 42, and while it is moving it may rub up against and between the stationary brake pad 41 and the moving brake pad 42 depending on which position the disengaging switch 43 is currently in.

It is obvious that the stationary brake pad 41 is secured to the strap-holder housing 31 of the pull-back unit 30, while the moving brake pad 42 is connected to the strap-holder housing 31 so that it may move, preferably so that it may tilt, A tensioning element 50 is interposed between the disengaging switch 43 and the strap-holder housing 31 in the interest of the disengaging switch 43 always returning to its basic position if the user is not operating it. In the given case the basic position is the state when the stationary brake pad 41 and the moving brake pad 42 are forced up against each other, and so the strap 12 running between them is in braked, essentially secured state.

Figure 3 also shows that almost the entire length of the strap 12 is wound onto the reel element 33 and wound back into the storage space 32 of the strap-holder housing 31 and only the connection pin 23 provided with the linking piece 23a secured to the second end 12b of the strap 12 hangs out of the housing 21. It should be noted here that when the strap 12 is in completely wound back state in the storage space 32 of the strap-holder housing 31 the connection pin 23 becomes recessed into the opening 1 lc of the base body 11. In this way the strap 12 does not even appear on the external surface of the device 10. The operation of the strap winding apparatus presented in figures 1 to 3 is as follows. In the initial state the entire length of the strap 12 is in the storage space 32 of the strap-holder housing 31 embedded in the first connection part 11a of the stock 11 in such a way that only the end of the connection pin 23 secured to the second end 12b of the strap 12 protrudes out of the strap-holder housing 31. The strap 12 is wound onto the reel element

33 and its part between the first end 34b of the coil spring 34a of the back-rotation device

34 secured to the rotation shaft 33a of the reel element 33 and its second end 34c connected to the strap-holder housing 31 is in loosely tensioned state, i.e. it is not completely tightly wound around the rotation shaft 33a of the reel element 33.

The user pushes the disengaging switch 43 of the strap-braking part-unit 40, grasps the connection pin 23 protruding from the strap-holder housing 31, pulls it out of the storage space 32 of the strap-holder housing 31 and starts to pull the strap 12 from the storage space 32 as well. The strap 12 moving outwards between the stationary brake pad 41 and the moving brake pad 42 of the strap-braking part-unit 40 makes the reel element 33 rotate, which then starts to rotate around the rotation shaft 33a. When the rotation shaft 33a rotates, the coil spring 34a connected to it by its first end 34b starts to be wound up, and as a consequence of this strain energy becomes stored in the coil spring 34a of the back- rotation device 34.

After the desired amount of the strap 12 has been pulled out by releasing the disengaging switch 43 the tensioning element 50 pushes the moving brake pad 42 into default state, and so the strap-braking part-unit 40 holds the given length of the strap 12 outside the storage space 32 of the strap-holder housing 31 of the pull-back unit 30. In this way the connection pin 23 located at the second end 12b of the strap 12 now reaches the housing 21 of the holding unit 20 fitted into the second connection part lib of the base body 11. If at this time the securing piece 25 of the locking part-unit 24 of the holding unit 20 is released, and the moving locking piece 24 is moved against the return element 26, a gap opens between the hook extension 24c of the stationary support piece 24b and the moving locking piece 24a, through which the linking piece 23 a of the connection pin 23 may be pushed into the space part between the moving locking piece 24a - the stationary support piece 24b - the hook extension 24c. After the moving locking piece 24a is released the strain energy accumulated in the return element 26 is transformed into movement energy, and pushes the moving locking piece 24a into default position. At this time the end of the moving locking piece 24a slides onto the hook extension 24c of the stationary support piece 24b and the linking piece 23a is unable to slide out of the closed space part. Following this the strap 12 of the device 10 may be put onto the shoulder and the device 10 may be transported worn on the shoulder.

When the transportation of the device 10 comes to an end, and it is used, then the user pushes the securing piece 25 of the holding unit 20 to release the lock between the moving locking piece 24a and the stationary support piece 24b of the locking part-unit 24 of the holding unit 20.

At this time the moving locking piece 24a may be pushed back against the return element 26 into the receipt space 22 of the housing 21 of the holding unit 20, and in this way the end of the moving locking piece 24a slides off the hook extension 24c of the stationary support piece 24b, as a consequence of which the linking piece 23a of the connection pin 23 may be released from the space part enclosed by the moving locking piece 24a - the stationary support piece 24b - the hook extension 24c. In this way then the second end 12b of the strap 12 becomes free.

If the user operates the disengaging switch 43 of the strap-braking part-unit 40 of the pull-back unit 30, then the moving brake pad 42 moves away from the stationary brake pad 41 and “releases” the section of the strap 12 clamped between the stationary brake pad 41 and the moving brake pad 42. And when the clamping stops the coil spring 34a constituting the back-rotation device 34 is released due to the effect of the strain energy stored in the coil spring 34a wound up onto the rotation shaft 33a of the reel element 33 and while it is unwinding - in the direction opposite to tensioning - it starts to rotate the rotation shaft 33a backwards. As a result of this the reel element 33 also starts to rotate and winds up the part of the strap 12 previously pulled out of the storage space 32 of the strap-holder housing 31 of the pull-back unit 30. The winding up continues as long as the disengaging switch is being depressed, and so the strap 12 is wound back into the storage space 32 of the strap- holder housing 31 until the connection pin 23 secured to the second end 12b of the strap 12 reaches the strap-holder housing 31, and gets caught in it while being pulled into the opening lie of the base body 11. In this case the entire length of the strap 12 disappears from the environment of the device 10, and so in no way is it able to disturb the use of the device 10.

Naturally, if the pressing of the disengaging switch 43 stops before the second end 12b of the strap 12 reaches the strap-holder housing 31, then the moving brake pad 42 once again pushes up against the stationary brake pad 41 and clamps the strap 12. With this operation the length of the strap 12 out in the open may be varied.

Moving over now to figure 4, it shows a more versatile version of the pull-back unit 30. Here also there is the strap-holder housing 31 of the pull-back unit 30 that encloses the storage space 32. And here also the reel element 33 and the rotation shaft 33a, as well as the stationary brake pad 41 and the moving brake pad 42 of the strap-braking part-unit 40 clamping the strap 12 connected to the disengaging switch 43 are located in the storage space 32. Here too a tensioning element 50, not indicated in the figure, may be located between the disengaging switch 43 and the strap-holder housing 31, which forces the disengaging switch 43 back to its default position.

The back-rotation device 34 may also be found, which has a coil spring 34a. The second end 34c of the coil spring 34a is essentially connected to the strap-holder housing 31, while in the case of the given embodiment the first end 34b of the coil spring 34a is secured to a spring-holding shaft 34d, and the coil spring 34a is wound onto this spring-holding shaft 34d to a lesser or greater extent depending on the position of the strap 12. The spring- holding shaft 34d also carries the first torque-transfer piece 34e, which is a cogwheel, and which first torque-transfer piece 34e cooperates with the second torque-transfer piece 33b positioned on the rotation shaft 33a of the reel element 33, i.e. with another cogwheel.

The number of teeth of the first torque-transfer piece 34e and the second torque-transfer piece 33b may determine the extent and strength of the transfer of the torque of the coil spring, and, along with this, the basic speed of the winding. The spring-holding shaft 34d also includes the speed regulation element 34f, which uses the magnitude of the friction between it and the spring-holding shaft 34d to regulate the speed of rotation of the springholding shaft 34d, and, finally, the degree of the rotation of the rotation shaft 33a as well.

The strap movement regulation part-unit 35 may also be found in the storage space 32 of the strap-holder housing 31, which, on the one part, has a rotation-direction limiting element 35a and, on the other part, a rotation prevention piece 35c. The rotation-direction limiting element 35a belonging to the strap movement regulation part-unit 35 is a shaped profile disc that cooperates with the handle piece 35e. The rotation-direction limiting element 35a and the handle piece 35e together form a ratchet structure. This is responsible for ensuring that in the given phase of operation, preferably during pulling out, the reel element 33 holding the strap 12 is only able to rotate around the rotation shaft 33a in one direction. The handle piece 35e is connected to the release switch 35b, with which the handle piece 35e hooked into the profile of the rotation-direction limiting element 35a may be lifted out of it, and so in the given situation the limitation of the rotation direction may be periodically suspended.

The rotation prevention piece 35c is a disc 35f in which holding seats 35g are created. The head 35i of the locking piece 35h forming a part of the switch 35d fits into these holding seats 35g. The locking piece 35h itself may be tilted as compared to the strap- holder housing 31, and the head 35i fitting into the holding seats 35g of the disc 35f is at its one end, while its other end is connected to the switch 35d. The task of the rotation prevention piece 35c it is secure the turning reel element 33, at certain angle intervals, in its given position even if the ratchet structure is disabled with the use of the release switch 35b.

It can be clearly seen in figure 4 that in addition to the reel element 33 holding the strap 12, the second torque-transfer piece 33b, the rotation-direction limiting element 35a and the rotation prevention piece 35c of the strap movement regulation part-unit 35 are secured to the rotation shaft 33 a.

The operation of the pull-back unit 30 according to figure 4 is as follows. In the initial position the strap 12 is completely wound up onto the reel element 33, and the connection pin 23 secured to the second end 12b of the strap 12 rests on the strap-holder housing 31 of the pull-back unit 30 in such a way that it may be pulled out of there. When the strap 12 is needed, by pulling the connection pin 23 out of the storage space 32 of the strap-holder housing 31 the reel element 33 rotates around the rotation shaft 33 a. The second torque- transfer piece 33b, the rotation-direction limiting element 35a and the rotation prevention piece 35c rotate together with the rotation of the rotation shaft 33a.

The second torque-transfer piece 33b makes the first torque-transfer piece 33e also rotate, which starts to rotate the spring-holding shaft 34d. As the first end 34b of the coil spring 34a of the back-rotation device 34 is secured to the spring-holding shaft 34d, due to the rotation of the spring-holding shaft 34d the coil spring 34a is wound up onto the spring- holding shaft 34d, and in this way strain energy is stored in it. It should be noted here that during this the strap 12 is being wound off the reel element 33.

While the rotation prevention piece 35c is rotating the head 35i of the locking piece 35h fitting into one of the holding seats 35g of the disc 35f rises out of the one holding seat 35g and jumps over to the next one. This operation is repeated as long as the rotation prevention piece 35c rotates together with the reel element 33. It should be noted here that the tensioning element 50 fitted between the locking piece 35h and the strap-holder housing 31 always forces the tiltable locking piece 35h back to its base position, which is in one of the holding seats 35g.

When the rotation-direction limiting element 35a rotates the handle piece 35e stands in open direction, so on the shaped profile it also rises to the surface of the rotation-direction limiting element 35a, then it is pushed back into the following profile element, but from there, due to the design of the ratchet structure, it is unable to rise backwards, only in the same rotation direction in which it has moved to that point. Therefore after leaving a given profile and fitting into the next one the rotation-direction limiting element 35a is unable to rotate backwards.

In this way the strap 12 may be pulled out of the storage space 32 to any optional extent in such a way that the second end 12b of the strap 12 hags freely. Because of the rotation- direction limiting element 35a with its ratchet structure and the handle piece 35e the reel element 33 is unable to rotate backwards around the rotation shaft 33a. After the desired amount of strap 12 has been wound off the connection pin 23 at the second end 12b of the strap 12, in the same way as that presented in the operation of the device 10 according to figures 1 to 3, may be secured into the holding unit 20, which is not visible in figure 4, Following this the device may be transported on the shoulder or even held in the hand using the strap 12.

When the device 10 is used the connection pin 23 must be released from the holding unit 20. Following this by operating the release switch 35b the handle piece 35e may be lifted out of the profile of the rotation-direction limiting element 35a, and in this way the rotation of the reel element 33 in any direction, even reverse rotation, becomes possible. By using the switch 35d the locking piece 35h may also be tilted in such a way that the head 35i of the locking piece 35h rises out of the holding seat 35g of the disc 35f and so the reel element 33 may rotate freely. It should be noted here that the release switch 35b and the switch 35d may be operated together or separately. In addition a version is also conceivable when the release switch 35b and the switch 35d constitute a single unit. Naturally in this case the two operations are performed at the same time.

By operating the release switch 35b and the switch 35d the reel element 33 is no longer prevented from rotating backwards, and the coil spring 34a wound up onto the spring- holding shaft 34d starts to rotate the spring-holding shaft 34d by releasing the strain energy accumulated in it. Due to the rotation of the spring-holding shaft 34d opposite to that previously the first torque-transfer piece 34e also starts to rotate, and transfers torque to the second torque-transfer piece 34b.

At this time the second torque-transfer piece 34b rotates and starts to rotate the reel element 33 around the rotation shaft 33 a. Due to this the unwound section of the strap 12 is once again wound up onto the reel element 33. The speed of the winding may also be regulated with the strap-braking part-unit 40 in the way shown when figures 1 to 3 were presented. This process continues until the connection pin 23 returns back to the strap- holder housing 31, or the user releases the release switch 35b and/or the switch 35d. As in this case the handle piece 35e tips back into the shaped profile of the rotation-direction limiting element 35a due to the effect of the tensioning element 50 and/or the locking piece 35h tips back into one of the holding seats 35g of the disc 35f due to the effect of the tensioning element 50.

The strap winding apparatus according to the invention may be used to good effect in the case of all device, but especially weapons when the strap only facilitates the transportation of the device, but makes the use and storage of the device difficult and so its quick, simple and quiet removal from the surface of the device is required.

List of references device 11 base body

11a first connection part lib second connection part

12 strap 12a first end 12b second end

12c intermediate piece holding unit 21 housing

22 receipt space

23 connection pin

23 a linking piece

24 locking part-unit

24a moving locking piece 24b stationary support piece 24c hook extension

25 securing piece

26 return element pull-back unit 31 strap-holder housing

32 storage space

33 reel element 33a rotation shaft

33b second torque-transfer piece

34 back-rotation device 34a coil spring

34b first end 34c second end 34d spring-holding shaft 34e first torque-transfer piece 34f speed regulation element

35 strap movement regulation part-unit 35a rotation-direction limiting element 35b release switch

35c rotation prevention piece 35d switch 35e handle piece 35f disc

35g holding seats 35h locking piece 35i head strap-braking part-unit 41 stationary brake pad

42 moving brake pad 43 disengaging switch

50 tensioning element

Claims

1. Strap winding apparatus for devices carried on a carrying strap, particularly for weapons suitable for shooting projectiles and having a stock, which has a strap (12) with a first end (12a) connected to the first connection part (11a) of the base body (11) of the device (10) and a second end (12b) connected to the second connection part (l ib) of the base body (11) of the device (10), a pull-back unit (30) is interposed between the first end (12a) of the strap (12) and the first connection part (11a) of the base body (11) of the device (10), the pull-back unit (30) has a strap-holder housing (31) with a storage space (32), a reel element (33) that rotates around its rotation shaft (33a) in the storage space (32), a back-rotation device (34) connected to the reel element (33) and a strap movement regulation part-unit (35) are fitted into the storage space (32), the first end (12a) of the strap (12) is connected to the reel element (33) either directly or via an intermediate piece (12c), characterised by that a holding unit (20) is interposed between the second end (12b) of the strap (12) and the second connection part (lib) of the base body (11) of the device (10), where the holding unit (20) has a housing (21) at the second connection part (lib) of the base body (11) of the device (10) at least partly recessed into the base body (11) and a receipt space (22), a connection pin (23) that may be connected to the second end (12b) of the strap (12) and that may be fitted into and removed from the receipt space (22) of the housing (21), and a locking part-unit (24) serving for securing the connection pin (23) in the receipt space (22) of the housing (21), while the strap-holder housing (31) of the pull- back unit (30) is at least partly recessed into the base body (11) at the first connection part (11a) of the base body (11), and with the pull-back unit (30) in its basic position at least a part of the strap (12) is wound onto the reel element (33), and so it is pulled back into the storage space (32) of the strap-holder housing (31) located inside the base body (11).

2. Strap winding apparatus according to claim 1, characterised by that the locking part- unit (24) of the holding unit (20) has a moving locking piece (24a) and a stationary support piece (24b), where the stationary support piece (24b) has a hook extension (24c), the connection pin (23) has a linking piece (23 a) fitted to the hook extension (24c) of the stationary support piece (24b) and cooperating with it, and with the locking part-unit (24) of the holding unit (20) in locked position the linking piece (23a) of the connection pin (23) is held between the hook extension (24c) of the stationary support piece (24b) and the moving locking piece (24a), and a securing piece (25) is interposed between the housing (21) and the moving locking piece (24a).

3. Strap winding apparatus according to claim 2, characterised by that an energy- storing return element (26) is inserted between the moving locking piece (24a) and the housing (21).

4. Strap winding apparatus according to claim 3, characterised by that the energy- storing return element (26) is a coil spring.

5. Strap winding apparatus according to any of claims 1 to 4, characterised by that the back-rotation device (34) has a coil spring (34a), the first end (34b) of the coil spring (34a) is secured to the reel element (33), and the second end (34c) of the coil spring (34a) is linked to the strap-holder housing (31), and at least a part of the coil spring (34a) is wound onto the reel element (33).

6. Strap winding apparatus according to any of claims 1 to 4, characterised by that the back-rotation device (34) has a spring-holder shaft (34d) that may be rotated as compared to the strap-holder housing (31), at one of it ends (34b) a coil spring (34a) secured to the spring-holder shaft (34d) and partially wound onto the spring-holder shaft (34d), as well as a first torque-transfer piece (34e) secured to the spring-holder shaft (34d), while the reel element (33) is provided with a second torque-transfer piece (33b) cooperating with the first torque-transfer piece (34e), and in this way the reel element (33) and the spring-holder shaft (34d) with the help of the first torque-transfer piece (34e) and the second torque- transfer piece (33b) have a positive mechanical engagement between each other, and the second end (34c) of the coil spring (34a) is connected to the strap-holder housing (31).

7. Strap winding apparatus according to claim 6, characterised by that a speed control element (34f) is interposed between the spring-holder shaft (34d) and the strap-holder housing (31).

8. Strap winding apparatus according to any of claims 1 to 7, characterised by that it is provided with a strap movement regulation part-unit (35), where the strap movement regulation part-unit (35) has a rotation-direction limiting element (35a) and a release switch (35b) for disabling the rotation-direction limiting element (35a), as well as a rotation prevention piece (35c) and a switch (35d) for securing the rotation prevention piece (35c), the rotation-direction limiting element (35a) is formed by a shaped profile disc secured to the reel element (33), while the release switch (35b) has a handle piece (35e) that may be tilted as compared to the strap-holder housing (31), the rotation prevention piece (35c) is also a disc (35f) secured to the reel element (33) and provided with holding seats (35g), and the switch (35d) has a locking piece (35h) that may be tilted compared to the strap-holder housing (31) and a head (35i) fitting into the individual holding seats (35g).

9. Strap winding apparatus according to any of claims 1 to 8, characterised by that a strap-braking part-unit (40) is positioned in the receipt space (22) of the housing (21), where the strap-braking part-unit (40) has a stationary brake pad (41) and a moving brake pad (42) coupled with this, the strap (12) runs between the stationary brake pad (41) and the moving brake pad (42), and the moving brake pad (42) is connected to a disengaging switch (43).

10. Strap winding apparatus according to claim 9, characterised by that the switch (35d) of the strap movement regulation part-unit (35) and the disengaging switch (43) of the strap-braking part-unit (40) constitute a single unit.