WO2007099379A2

WO2007099379A2 - Improved release aid

Info

Publication number: WO2007099379A2
Application number: PCT/HU2007/000014
Authority: WO
Inventors: János FEHÉRDI
Original assignee: Feherdi Janos
Priority date: 2006-03-01
Filing date: 2007-02-28
Publication date: 2007-09-07
Also published as: HU0600047V0; WO2007099379A3

Abstract

The invention relates to a release aid with at least two connection units, which connection units can be connected to the string of the bow and have an internal arrangement ensuring its condition in which it can transmit force onto the bowstring and the terminate this connection with one movement of a finger. The characteristic feature of the invention is that the distance between the contact points (4) established on the string (3) of the bow (T) is at least 24 mm. The object of the invention is an unit consisting of a release aid, a strap that can be attached to the wrist of the hand, a connecting element connecting these allowing rotation in several directions, and a grip. The characteristic feature of the invention is that the grip (8) has a knob (12b) or trigger (lbc) suitable for taking over the movement of the finger operating the release aid (1), and the grip (8) can be held by he hand with the strap attached to it (21) and allows different positions with respect to the release aid (1), and a mechanism transmitting the movement of the knob (12b) or trigger (lbc) is inserted between the release aid (1) and the grip (8)

Description

Improved Release Aid

The bow, a tool widely used by mankind for killing animals for food, was invented on several parts of the world, and as a weapon it also had a significant effect on the history of mankind and contributed to expanding our knowledge about the human body and dynamics. In the last few centuries the bow was pushed into the background as firearms because wide-spread, and for hundreds of years it was used only as a toy for children testing their skills, and only a narrow layer of adults used it as a hobby tool, disregarding the customs of diminishing native tribes. The bow as a hobby tool was revived again in the last century. Numerous new and even newer versions of the bow were invented both in respect of its construction and material, in accordance with the technical achievements of the given eras, and as a result of this the efficiency of the bow in respect of range and precision as well as the convenience of its use improved significantly.

Several significant novel inventions were made during the last century, such as the construction of the limbs of the bow as laminated-affixed plate springs, the limbs that can be removed and fixed on again by screwing, the use of modern materials in manufacturing the limbs, the central part, the string and the arrow, and auxiliary equipment never known before or deriving from somewhere else were invented, such as arrow guides, shock absorbers, stabilisers, draw-check indicators, target sights, different release aids. During the last hundred years different historical types of bows were revived and reconstructed on the basis of archaeological finds, they were improved using the latest technical and scientific knowledge, at the same time new types and categories of bows appeared and became standardised in some cases, and examples of these are the development of compound bows having auxiliary cables, the appearance of bows with fiat recurving limbs and the existence of international competition rules relating to them.

The first version of compound bows (with auxiliary cables) appeared several centuries ago in the indifferent atmosphere due to the wide use of firearms, it was light-weight, it had a similar construction as the construction known for a long time in technical areas, such as shipbuilding, that is having one single cable groove running around in the plane of rotation at a permanent distance from the centre of rotation, using pulleys and not trying to avoid the law of elastic theory - namely that greater deformation is accompanied by greater force. This solution already involved the possibility of improved efficiency realised in a greater range that could be achieved with an arrow of a given weight. Further significant improvement took place only in the last four decades in respect of compound bows. Cams of different constructions appeared, used at least on the place of one of the pulleys, constructed mostly for two strings, that is one string and one auxiliary cable, guided at a continuously changing distance from the centre of rotation, containing significantly different rope grooves, which makes them suitable for gearing forces generated in the string and the auxiliary cables and changing such gearing in a favourable way while drawing the bow (e.g.: US patent 3.486.405 and US patent 3.945.368), reducing the drawing force causing the trembling of the hand holding the bow during aiming to fulfil a very important condition of greater accuracy needed for longer range, and only slightly reducing the amount of work that can be other wise stored in the drawn bow, seemingly avoiding the law of elastic theory. Further versions of compound bows characterised by reduced drawing force during aiming were also created realising gearing in other ways, such as the solution in which it is realised without a cam or a possibly pulley next to it, with lifting arms similar to stiff horns typical of bows used by plainspeople, and also versions using both lifting arms that look like stiff horns and cams, pulleys co-operating with them. The effect of the improved efficiency due to auxiliary cables and the reduction of load during aiming characteristic of the versions constructed in the last four decades, which effect is manifested in the improvement of accuracy, contributed to the fact that this type of bow has recently become the most wide-spread in archery.

The use of geared-compound bows that can be held securely despite the increased range called for the necessity of eliminating or reducing other hindrances preventing further increasing of accuracy, such as the faults deriving from manual release. The different release aids constructed are suitable for reducing the release faults of the hand holding the drawn string. The essential part of all release aids is a connecting unit suitable for transferring force exerted onto the skirt-surface of the string, resulting in the drawing of the bow, that is the increasing of the different tensions generated in the bow and string as a result of drawing, which connecting unit is constructed in a way suitable for establishing such connection and also terminating this connection - and also the transferred force - by one single movement of one finger of the hand drawing the bow. One type of connecting unit consists of two double-armed levers forming a clamping unit constructed by doubling the arms that can be clamped on a loop attached to the string in a given case, another type of connecting unit consists of a stiff hook-like element that can be suspended in front of the string, a third type of connecting unit consists of an element with a flexible string surrounding the string or a separate loop attached to the string, and when the line of the bowstring is in direct contact with any of the above types of units, it breaks while the bow is drawn creating the contact point or contact points in this way. On the connection unit getting in contact with the separate loop used between the string and the connection unit the line of the separate loop breaks, and the contact point is created at the joint of the separate loop and the string resulting in the breaking of the string at this point.

The efficiency of arrow-shooting manifested in accuracy also depends on the curve of the flight path, which is related to the work that can be stored in the bow when it is drawn, to the efficiency characteristic of the given bow transferred into the shot arrow and appearing as the ratio of the work that can be stored, to the weight of the arrow, to the initial speed determined by the above, to gravity and to the aerodynamic resistance indicators of the shot arrow, and these factors also have an effect on the shooting range.

Geared-compound bows also have an unfavourable characteristic feature, namely that the drawing force to be maintained at a reduced extent during aiming exists only on a rather short section of the draw length. In the case of a bow drawn over this section a rather large and sudden increase of drawing force can be experienced, as a result of which the given geared-compound bow has a characteristic draw length. This, however, only suits an archer with a given body size, who is capable reaching the most appropriate draw length, and allows only this archer to enjoy all favourable characteristic features of the given geared- compound bow excluding others, so a given archer needs to choose his/her geared- compound bow with special care, also taking into consideration the draw length, although the draw length can be set in the case of certain types, mostly within narrow limits. Furthermore known release aids can also be set to overcome differences of the draw length, but only slightly. This circumstance sets back the acquisition of geared-compound bows significantly as well as their exchange between archers.

As the maximum draw length of an archer is limited by his/her body size, and the drawing force is restricted by the archer's bodily strength, the archer's freedom is especially restricted in choosing geared-compound bows, especially if the aim is also to reach the maximum possible shooting range. The archer's freedom of choice would be extended, if he/she could have a choice of bows of different strengths and also of different draw lengths, even significantly different ones, mainly larger ones, than the presently available ones. For example, either by forcing the bowstring into a different shape resulting in the actual shortening of the draw length, which could be possible by using a new type of release aid, or by creating new mechanisms establishing a new type of connection between the release aid and the operating fingers, allowing a much greater freedom than before in the distance between a given part of the hand, for example the wrist, and any type of release aid, or by a combination of the above two possibilities; and beside this the realisation of a better, more secure force-transmitting connection between the string- drawing hand and the string would represent a further advantage.

Looking at the methods of drawing the bow known so far and the bow drawn by hand or by any other known release aid, the bowstring breaks either on the finger or fingers of the hand, o on the one or two connection units of the known release aids, at one contact point, or two or more contact points situated at a distance from each other not having a relevant effect on the draw length. The relevant shortening of the draw length is a value of about 12 mm (1/2 inch), which value is generally stated on the product lists of bows and arrows as the smallest unit of the draw length of the bow or setting the draw length of the bow. Taking the condition as a basis in which the bow has been loaded but not drawn yet and also the different sizes of bows in this respect, the connecting points where the string joins the limbs (the cam, pulley or other elements depending on the given construction) are situated at a distance from each other characteristic of the given bow, and this distance is shorter when the bow is drawn, at an extent depending on the given bow. For this reason the shortest distance between two contact points having a relevant effect on the shortening of the draw length, which distance is to be realised between the connecting points using the release aid according to the present invention is always different. As it is always more difficult to take measurements on a drawn bow than on a bow simply loaded, it is simpler to examine a bow in the latter condition, and practically the distance between the contact points resulting in the relevant shortening of the draw length should be proportioned with respect to the distance between the connecting points that can be measured on a bow not yet drawn. In the case of a bow on which the connecting points are situated at a distance of 1000 mm from each other, also considering the ordinary draw lengths and other dimension characteristics, a 50 mm distance between the contact points will result in significant shortening of the draw length, as a result of which the number expressing the proportion of the shortest distance between the contact points with respect to the distance between the connecting points is 1/20. The same ratio is not significantly smaller in the case of a (longer) bow with a greater distance between the connecting points, but it is about 1/10 in the case of a bow on which the distance between the connecting points is about 500 mm in practice, which demonstrates that the ratio is not constant. As in principle a geared- compound bow can be manufacture on which the distance between the connecting points measured when the bow is drawn can be reduced even to 24 mm, in this case the same distance of the contact points may also result in the relevant shortening of the draw length to about half of the above distance. For this reason the release aid in the case of which the distance between the two (extreme) contact points reaches 24 mm is according to the aim set by the invention, and in the case of a favourable construction this distance is even larger than this, and it is especially favourable, if this distance can be altered. Obviously the string does not break at the contact points without any transition, in one single point, but it goes along a curved section on the parts of the release aid, as on the fingers of the hand. Even if this given part was an unfavourably sharp, cornered piece, the string would break along a curve of a small radius, considering the diameter of the string. As because of considerations relating to lifetime some sort of rounding must be used by all means, it may be a problem to determine the exact place of the contact points and the distance between them. Furthermore, the string may be connected a release aid at more than two contact points resulting in several breakpoints at a small angle, or it may be forced to take on the shape of a given curved section via its part in connection with the release string in order to make the length of the given bow relevantly shorter, by at least 12 mm. All these solutions are also provided by the present invention, and they can be related to a release aid realising two breakpoints with two cornered parts constructed with irrelevantly slight rounding, touching the string. The distance between the corners that can be measured on this release aid determines the distance between the contact points that needs to be examined from the aspect of realising the aim set by the present invention.

The aim of the invention is to construct a release aid, which enables the same archer to use many different types of bows of many different sizes in the most efficient way, in the most suitable construction to exert the necessary force and to have a secure grip.

Most generally the release aid according to the invention has two connection units that can be favourably attached to the string in a way facing two opposite sides of the arrow touching it, which connection units are constructed in a way that they are able to transmit force onto the string in order to draw the bow and then release it and to terminate such force transmission, and have a structure that is already known or is in accordance with any of the methods described in the present invention, and is suitable for establishing contact points, characterised by that the distance between the two contact points is at least 24 mm, and, in the case of a favourable construction the distance between the contact points can be set to a value greater than the above value to ensure the possibility of adjusting the draw length. Beside the use of a wrist strap ensuring connection between already known release aids not resulting in the relevant shortening of the draw length or release aids according to the present invention and the hand drawing the bowstring, the realisation of the aim set by creating the invention is also facilitated by connecting at least one flexible force transmission element or, as an alternative solution, a mechanism ensuring the remote controlled opening movement of the release aid between the fingers operating the release aid and the release aid, as a result of which it becomes unnecessary for the pointing finger, which is the most suitable for operating the release aid, to be close to the release aid, realising by this greater freedom in respect of the possibility of adjusting the distance between the hand and the string. Due to the above the archer may use a bow according to its draw length within a wider range, he/she can use them by adjusting the most favourable draw length, by placing the release aid closer to or further away from elbow, in the most favourable position with respect to the hand. A few^" favourable constructions of the release aid according to the invention and the equipment realised with it in a given case are explained below on the basis of figures.

Figure 1 shows the spatial dimension of the characteristic part of a favourable construction of the release aid according to the invention, on which the distance between the contact points cannot be adjusted in the case of the present construction. Figure 2 shows the side view of the characteristic part of a construction other than the construction shown in figure 1. Figure 3 shows the part as in figure 2, in front view. Figure 4 shows the section marked in figure 2. Figure 5 shows the characteristic part of the release aid with a construction as in figures 2-

4, in partly open and partly closed condition not found in real life, in top view. Figure 6 shows the side view of a favourable construction of the release aid, on which the distance of the contact points can be adjusted. Figure 7 at the top shows a characteristic part of the construction as in figure 6, in top view, in pair with the characteristic part of another construction shown at the bottom of the figure. Figure 8 shows further parts belonging to the two types of construction as in figure 7, on two sides of the dotted line in the middle, in the same way, in top view. Figure 9 shows the parts as in figures 7 and 8, in top view, suiting the construction shown in said figures. Figure 10 shows the parts of the two types of constructions as in figure 7 and 8, in front view starting out from the top view as in figures 7 and 8. Figure 11 shows another version of the part as at the bottom of figure 7 manufactured according to a different manufacturing procedure, in pair, showing the partly different constructions of the members of the pair at the bottom and at the top of the figure, in top view. Figure 12 shows parts of a construction partly different from each other, as in figure 11, together with further parts, in front view starting out from the top view as in figure

11. Figure 13 shows the parts belonging to the version as in figure 11, in the same way, n top view. Figure 14 shows the parts as in figure 12, in double enlargement, in accordance with figure 11 , in top view.

Figure 15 shows the side view of another construction according to the invention, on which the distance between the contact points can be adjusted, partly in section.

Figure 16 shows the stepped section marked in figure 15.

Figure 17 shows an even further different construction, on which the distance of the contact points can be adjusted, in side view, in section.

Figure 18 shows a release aid of a construction as in figure 17, in rear view.

Figure 19 shows section A-A marked in figure 17.

Figure 20 shows section B-B marked in figure 17.

Figure 21 shows a release aid as in figure 17, in front view.

Figure 22 is the diagrammatic view of the difference of the shape of the string when the bow - with one string characteristic of traditional bows — is loaded on the left, and when it is drawn as shown in the right, in the case of traditional single contact point drawing and in the case of double contact point drawing realised with the release aids according to the invention.

Figure 23 uses the same method as used in figure 22 to show the difference between the two shapes of the string, in the case of a bow with a cam (when the string connecting with the arrow-nock becomes longer when the bow is drawn by uncoiling from the cable track of the cam, while the auxiliary cables get coiled up onto the cable track that is the closest to the axis of rotation which is the same as the given cam, while the two cams or the cam and the pulley facing it move closer to each other. The extent of the lengthening of the string is obtained from the difference between the sections belonging to the given angular rotation of the cable track belonging to the string or the auxiliary cable, or their sum in the case of two cams.)

Figure 24 shows a new method of realising the equipment suitable for increasing the draw length via a shortened connection closer to the wrist and also to the elbow, which method can be used both in the case of the release aid according to the present invention and known release aids. Figure 25 shows the method of transmitting the movement of the hand made to operate the release aid onto the release aid in the case of the shortened connection as in figure

24, in a possible construction. Figure 26 shows a further construction of the shortened connection as in figure 24 realising a more remote, adjustable but still appropriately stiff connection between the extension functioning as a stand for the connection units forming the contact points and the grip, in side view, spread out in plane. Figure 27, shows the position of the release aid, the grip and the strap attached to the wrist with respect to each other, in the case of a right-hand bow, in top view based on the previous figure.

Stalling the description of the release aid 1 according to the invention on the basis of figures 22 and 23, the recognition comes that in order to bend the limbs 2a of a bow 2 into the position shown in the figure - further away from the pressure point 2b touched by the hand holding the bow, that is via the string 3 drawn back - practically the same work needs to be invested when the string 3 breaks at one contact point 4 and when it breaks at two contact points 4, and there is hardly any difference between the lines of the string 3 connected to the limbs 2a along the sections connected to the limbs 2a in the case of one or two contact points 4. The recognition also comes that by increasing the distance between the two contact points 4 - when the limbs 2a are in the same bent position -, the distance between the pressure point 2b and the point of the string 3 touching the nock 7 of the arrow 5 drawn back ready to be shot, that is the draw length H, is reduced. As a result of this the average force needed to drawn the bow 2a to be exerted on the string 3 slightly increases, but even a person with shorter arms can cope with it. By changing the distance between the two contact points 4, the same bow 2 may be suitable for several people with different physical characteristics, the significance of which can be realised especially if we take into consideration that in this way the draw length H may be reduced even by more than fifty mm, and examine the advantages deriving from reducing the length of the arrow 5, but even a value smaller than this is relevant. It can be seen in figure 23 that the final result of the lengthening resulting from drawing back the string 3 is similar, relating to the cooperation with cams 6, making it possible to use a shorter arrow 5. Basically known release aids can be divided into three types. The first type has a diagonal, canting construction between its two stiff arms closed together like a twist clamp, in a way that it is able to transmit force onto the bowstring 3 or the string loop attached to the bowstring 3, and the two components of the counterforce transmitted by the bowstring 3 or the string loop attached to it acts to force apart the two stiff parts, and in order to prevent this opening apart it also has an arrest mechanism that can be disabled with a single movement of a finger. The second type has a stiff hook-like element that can be suspended in front of the bowstring 3 and is constructed in a way that it can tilt around a pin, and this element transmits pressure force onto the skirt of the bowstring 3, and when it is released, tilting is allowed. The third type of release aid also has a string loop, which is connected to the body of the release aid at one point, near its tilting hook-like part, and this string loop can be coiled around the bowstring 3 or to the string loop attached to the bowstring 3, in a way that the centre of the string loop forming a part of the release aid is suspended behind a hook-like part keeping the bow 2 in its drawn position with the help of a tilt-preventing mechanism. A common feature of all three types is that the arrest mechanism constructed in a way that it can exert force against opening apart or tilting can be operated with one single movement of a finger of the hand holding the release aid. Examples of all three versions can be found (www.truball.com, www.carterenterprises.com, www.cobraarchery.com). There are also examples of transitions between these versions, such as a release aid that can be connected directly to the bowstring 3 with a tilting hook-like part (www.goldenkeyarcherv.com). A common feature of all of them is that practically they act upon the bowstring 3 at one contact point 4, even the one the arms of which that can be connected to the bowstring 3 are forked, but the space between the prongs of the fork is to be regarded as relief made on the wider arm Ib accommodating only one nock 7 and its maximum two metal finder knots, because the distance between them is not at all enough for the relevant shortening of the draw length of about thirteen mm, in the lack of such target (www.oneidaeaglebows.com). For this reason this release aid has one contact point 4 too.

Continuing the description on the basis of figure 1 it can be seen that it describes a construction of the known version with two stiff arms that can be closed like a twist clamp developed in accordance with the release aid according to the invention to make it suitable for creating a remote contact point 4 resulting in the relevant shortening of the draw length H, considering the proportions of the parts of figure 1 , from which proportions it can be concluded that in this case, for the sake of the example, the distance between the contact points 4 is about fifty mm, which, in the case of a bow 2 of average size, with a camp, that is a thousand mm bow 2 considering the distance of the contact points, results in the shortening of the draw length H by about thirteen mm. It can be seen that the part that can be closed like a twist clamp, which also has a pair co-operating with it but not shown here, is practically a double-armed lever, one arm of which is doubled, with prongs, like a fork constructed at a distance from each other resulting in the relevant shortening of the draw length H. Practically it is the modification of a known mechanism that can be found on the product list of numerous manufacturers. It can be seen that the one arm Ib of the one lever laa of the release aid 1 shown here significantly extended crosswise, considering its proportions, and it has an incline Ia at both ends. In other respects it has a construction similar to any other known release aid, and it can be connected to other release aid parts of a known construction and operation, according to the methods known in themselves. Consequently, in this case too there is a bore 1 c to accommodate the pin Ie allowing tilting and at the same time fixing the release aid 1 to its house Id (e.g.: figure 5). In this case too the arm lba protruding inside the house Id is constructed in a way suitable for accommodating a roller lbb or a trigger lbc, in a way known in itself. The arm-ends lbv containing the incline Ia are constructed ass parts connected in a stable way to the extended ends of the arm Ib, positioned in the direction of the arm Ib. The ends of the arm Ib extended crosswise may be significantly longer than shown in the figure, and the arm- ends lbv may also be constructed in a way that they are attached to the extended ends of the arm Ib at several points, practically by some releasable connection, even as a slides, taking as a basis the few solutions that can be examined in figures 6-16, realising the possibility to adjust the distance between the contact points 4. In figure 1 it can also be seen that the inclines Ia are parts of a recess made suitable for accommodating the bowstring 3, and this recess also has a duct- wall lbd running along vertically, practically with a recess lbe in the middle to accommodate the right part of the nock 7. The duct- wall lbd and the recess lbe are shown only as possible parts of the given construction. The main point is the distance between the inclines Ia as the pails forming the contact points 4. It also needs to be mentioned that the bowstring 3 grabbed directly with the hand and drawn back, breaking on the fingers of the hand at more than one points may also result in the irrelevant shortening of the draw length H, or especially holding an appropriately stiff object significantly extended towards the bowstring 3 between the bowstring and the fingers of the hand in a way that when the bowstring is drawn back force can be exerted on it, and it may even be followed by relevant shortening of the draw length H, but none of these methods result in appropriately accurate and identical release.

Continuing the description on the basis of figure 2, the dimension of the arm Ib shown here is not significantly different from the known solutions, but a plate lbg is attached to it, and to the two ends of this plate lbg a favourably conical frustum shaped projection is attached each, which can made by pressing from the material of the plate, and the skirt of this projection forms the incline Ia where it touches the bowstring 3, as it can be seen in figure 4. The plate lbg can be strengthened with an edge lbp, and it can be attached to the arm lba of the lever laa with a pin lbe taken through a widened window lbf in a way allowing limited tilting and self-adjustment, and there is also constructed to accept the support provided from outside by the arm Ib against the effect exerted on the inclines Ia. By making the window lbf appropriately narrow the tilting around the pin lbe can be restricted. Figure 5 shows two - open and closed — positions of the release aid realising with the levers laa with a plate lbg, which positions do not occur at the same time otherwise, and it can be seen that the house Id can be provided with recesses Ida, if necessary, making it possible for the plates lbg forming parts of the levers laa to tilt around the pins Ie, and a mechanism according to any of the known solutions may also be placed in the house Id, for example one of the arms lba forming the inward part of the levers laa - in closed position here - may be equipped with a roller lbb, which also forms part of the new mechanism to be described in the following figures, and the open arm laa, constructed to suit it, having a trigger lbe may be fitted to the roller lbb. The house Id may also contain a new mechanism to be described on the basis of the following figures. The connection between the house Id and the hand drawing the bowstring 3 is not shown, as its methods are known. It is obvious and does not need to be demonstrated in a figure that the pails of the plates lbg on which the favourably conical frustum shaped projections are situated forming the incline Ia may be bigger than shown in the direction of the bowstring 3, and the projections containing the incline Ia may be constructed as separate parts that can be attached to these plates at several points, for example as parts of a slide with a fixing bolt moving in several ten mm long slots, ensuring the possibility to adjust the distance between the inclines Ia and also the contact points 4 in this way.

Figure 6 shows a construction establishing a new connection between the release aid 1 and the hand drawing the bowstring 3, with two houses Id fixed in a way that the distance between them can be adjusted, and there may even be a third house between them. The houses Id in extreme position contain the mechanism the operation of which ensures the closed and open position of the arms laa operating like a twist clamp and the changing between these two positions, and which mechanism may be in accordance with any of the known mechanisms or the ones described in connection with figures 7-10, so in figure 6 no further details are shown about it. Here an essential part of the release aid 1 is a grip 8 with two extensions 8a to which the house Id is attached in a way that it can be moved between given limits, with the help of a bolt 8b or other element protruding through any of the bores arranged in a line or through a long slot made in the extension 8a. A rotating rod 9 is taken through each house Id fitted with bearings using any of the methods known in themselves, with a joint suitable for transmitting torque through the levers laa arranged in a line inside the houses Id, and very favourably the rotating rod 9 has a thickness of about six mm, practically it has a hexagonal cross-section, it is an appropriately hard chrome-vanadium alloy steel rod of an optional length. In the levers laa there is a hole 9a suiting the cross- section of the rotating rod 9.

Figure 7 shows an example of that the cross-section of the rotating rod 9 and the hole 9 can be constructed in different shapes and sizes, and also that in a given case the lever 1 aa can be constructed to be able to tilt around the pin Ie fitting in the bore Ic or around the rotating rod 9 fitting in the hole 9a, and it is expressed by showing different levers laa at the top and at the bottom of figure 7. It can be seen in figure 7 that as parts of the mechanism making it possible to open the levers laa and keep them closed, shown here as a possible novel construction, both levers laa are provided with a roller lbb, between which there is a slide 10, which is appropriately hard, wear-resisting, appropriately thick, plate-like and ensures the closed position of the levers laa and it can be moved along a straight line, and by pulling this slide 10 out from between the rollers lbb the inclines Ia on the levers laa are opened apart and the bowstring 3 is released. It can be seen in figure 9 that - for the same of this example - the slide 10 has a window 10a with a lift arm 11 attached to the house Id in a way allowing tilting taken through it, as shown in figure 8. Figure 8 shows two construction possibilities of the two types of lever laa shown in figure 7 with respect to the house Id, and it also shows two ways of operating the lift arm 11. At the top of figure 8 the method is shown according to which in order to pull out the slide 10 from between the rollers lbb, it is necessary to apply pulling force onto an internal cable 12a that can be moved inside an external, flexible, cylindrical sleeve 12. At the bottom of figure 8 the method is shown according to which it is necessary to apply pressing force onto the cable 12a that can be moved inside the sleeve 12. Both methods are widely known in vehicle manufacturing industry or in connection with old types of cameras. At the bottom of figure 8 it can be seen that the lift arm has a practically spoon- like broadening and a recess shown at the bottom of figure 10 to accommodate the appropriately stiff end of the cable 12a at this point. Figures 8 and 9 show a favourable construction in the case of which, as a possible way of moving the slide 10 there are two bores on the slide 10, and after placing the slide 10 into the house Id, pins 10b are put in the bores through the slots 10c made for the purpose of moving along the house Id. Figures 8-10 also show an example of that by attaching a knob 1Od onto one of the pins 10b extending further away out of the house Id that can also be made from bent plate, a further new construction of the known release aids with one contact point 4 can be produced, as the knob 1 Od and the slide 10 together with it can be moved directly, with a finger. Returning to figure 6, it shows the two sleeves 12 constructed to suit the method of operation described in connection with the bottom part of figure 8 for the operation of the two pairs of levers laa fitted with rollers lbb, and it also shows a knob 12b at the top of the grip 8 accessible for the thumb constructed in a way suitable for transmitting pressing force onto the two cables 12a.

Figure 6 shows a construction in which between the two extreme houses Id also containing an operating mechanism with a slide 10 there is one (or maybe two) further house Id containing smaller levers laa. It makes sense, when in order to adjust the draw length H the two contact points 4 need to be adjusted closer than what is allowed by the grip 8, or when only one contact point 4 is needed. In the case of use with one contact point 4 the levers laa containing only arm Ib and not containing arm lba have a recess lbh accommodating the nock 7 of the arrow 5, as a result of which the surface of the incline Ia is also divided into two parts forming a bifurcated arm Ib. The arms Ib made slightly wider along the bowstring 3 obviously do not result in any relevant shortening of the draw length H. The bowstring 3, which is a straight line before the bow 2 is drawn, gets in between each pair of levers laa when the release aid 1 is fitted on, in the position shown in figure 6, but it only breaks at the two extreme ones when the release aid is pulled back. In the case of a bow 2 with a greater draw length the archer needs to fit the bowstring 3 only in between the pair (or two pairs) of levers laa before the grip 8, and the release aid 1 can be attached to the bowstring in a slightly twisted position. As an obvious solution the inclines Ia situated on the extreme pairs of levers laa can also be constructed as parts of the removable projections.

According to figures 11-13 the levers laa can be constructed as plate-like parts, even in pairs, by fixing distance pieces lbi between them, and the piece lbj containing the incline Ia can be attached to them as a separate part, in several different known ways. In figure 13 it can be seen that the simultaneous tilting of the levers laa is ensured by a cylindrical pin lbk or some other construction, while according to figures 12 and 14 it can be solved in other ways too, practically by attaching cogged pieces 13 onto the rotating rod 9, which cogged pieces 13 are identical in an exchangeable way.

Figures 15 and 16 show a further favourable construction of the release aid I₅ which is similar to the solution described in connection with figure 6 in several respects, but here the slide 10 is constructed in a way suitable for a different type of movement. It can be seen that the extension 8a is made from a plate of a U-shaped cross-section, as a favourable construction, and in this way, apart from malting it possible to take it through between two halves of the grip 8 constructed as mirror images, it is also suitable for accommodating a rod 14 fitted in a sliding way. The rod 14, according to a favourable construction, is suitable for being connected to one end of a connecting rod 14a allowing continuous adjustment. An intermediate piece 14b taken through each long slot of the extension 8a in a way allowing sliding and extending through the slot is connected to the rod 14 and the connecting rod 14a in a way suitable for transmitting force and movement, practically interlocking each other. On the section of the intermediate pieces 14b constructed in a way turning parallel to the extension 8a and extending over the right slots of the house Id, there is a slot 14c providing an inclining track and extending into to this slot 14c there is a pin 1Oe attached to the side of the slide 10, due to which the parallel movement of the intermediate piece 14b with respect to the extension 8a results in the movement of the slide 10 at right angles to it, as a result of which it gets in between or out from between the rollers lbb. The track of the slide allowing sliding 10 is provided by the house Id from three sides, namely its two sides facing each other and a rib IbI on each side. On the side of the slide opposite the ribs IbI the track is delimited by the intermediate piece 14b. In the interest of better comprehension the slide 10 is not shown on the lower part of figure 15. In order to be able to push the rod downwards according to the position shown in figure 16, practically an ear 14d is attached to the rod 14. According to another solution in the side- walls provided by the U-shape cross-section of the extension 8a there is a slot 8c each facing each other, and an ear 14e is taken through these slots 8c crosswise and also through the slots made in the grip at the same place and then attached to the rod 14 towards the left or right side of the grip, extending over the grip 8, at a place suiting the thumb of right- handed or left-handed persons. It needs to be mentioned here that the returning movements occurring after the operating movements created with the movements of the hand and the individual fingers can be created in a way known in itself, practically with the use of different springs, and the release aids 1 described herein can be modified according to methods known in themselves, and the details described herein and known in themselves can be exchanged with each other in order to realise even further new constructions.

Continuing the description by describing an even further favourable construction shown in figures 17-21, it can be seen that the grip 8 is longer than shown before, it significantly extends over the edges 8d designed to prevent the slipping of the hand, and in these parts extending over there is a groove suitable for moving the push-rod 15 along it. In this case the inclines Ia transmitting force onto the bowstring 3 when the bow is drawn are situated on the stationary pads 8e constructed as extensions of the grip 8 and on the moving pads 15a constructed as extensions of the push-rod 15. The stationary pads 8e close together with the moving pads 15a in a way that the roller lbb fitted onto the lever 16, which is inserted between two ears 8f attached to the grip 8 and is constructed in a way allowing tilting around the pin 8g taken through the ears 8f, and the lower horizontal plate of the block 17 fitted in the push-rod 15 join each other. By turning the lever 16 clockwise (figure 17), the roller lbb getting out from underneath the block 17 does not prevent the moving pads 15 any longer from moving away from the stationary pads 8e. As it can be seen, the inclines Ia, as compared to the ones before, are positioned crosswise, and they are constructed for light, flexible, practically appropriately shape-keeping elastic rings 19 connected to the bowstring 3 with a bridle made from light, flexible string tied onto it. At the top of figure 17 the position is shown while the bowstring is pulled, while at the bottom of figure 17 the released position is shown.

In order to prevent the sliding of the bridles 18 practically a knot should be tied onto the bowstring 3, or metal knots not shown here should be placed on it, in a way known in itself. Determining the track of the push-rod 15 to prevent it from falling out by constructing pins extending into the grooves situated in the ends of the grip 8 is only one of the possible constructions, as other methods can also be chosen from already known methods. There is also great freedom in the actual construction of the other details, as the roller lbb can be connected to the moving push-rod 15, and the block can be attached to the prong of the lever 16 onto which the roller lbb is fitted in this figure. In respect of materials there is also a wide selection relating to any construction described herein, which is obvious for all average experts with some experience in this field. For example several types of plastic is suitable for the grip 8 and push-rod 15 of the construction according to figure 17, accompanied by the suitable manufacturing procedure. The construction according to figure 17 itself does not ensure adjustability between the contact points 4, but it can be guaranteed by the possibility of changing the bridle 18 or the size of the rings 19, or choosing from several grips 8 manufactured in different appropriate lengths and choosing the right push-rod 15 suiting it.

In figure 17 it can be seen that the knot 20 prevents especially the bridle 18 tied into or around it from sliding along the bowstring 3 in the most secure way. For this reason it can be seen here the best that the connection unit can be constructed not only with levers laa resisting the force occurring in line with the creation of the contact point 4 parallel to the bowstring 3, or with stiff hook-like elements, but also with an element made of a flexible string surrounding the bowstring 3 or the bridle 18 tied onto it like a chain link. Moving on to figures 24 and 25, they show a possible construction making it possible to reach the aim set by the invention in a different way, using the solutions described so far and any of the already known solutions. Above constructions are described as a result of which beside maintaining the most appropriate draw length H determined by the body size of the given archer, it is possible to guarantee the appropriate use of bows 2 dimensioned for a greater draw length H than the length provided by the present possibilities, in a way that the necessary length of the arrow 5 also remains the same. The construction to be described here provides a new solution not only in respect of the individual details of the release aids 1, but also in respect of the connection between the hand drawing the bowstring 3 and the numerous release aids 1 described herein or chosen from the known solutions, with which connection the draw length H that can still be handled by the given archer and is characteristic of the bow can be larger than the length that can be achieved in the case of the constructions known so far ensuring connection between the release aid 1 and the hand, obviously resulting in the necessary greater length of the arrow 5 too. A significant part of the known release aids 1 is not in connection with the hand in a way being gripped by the fingers and loading the fingers with pulling force, but behind the back of the hand they are attached to a strap 21 made of leather or textile wrapped around the wrist, with a lengthening intermediate piece the size of which can be changed between certain limits, in order to ensure that the operating element, for example the trigger, of the release aid is within in easy reach of the fingers of the same hand. The solution described here is based on the recognition that by shortening the lengthening intermediate piece to a certain extent, the release aid 1 can be placed closer to the wrist by about fifty mm, and the release aid 1 , which gets out of the reach of the fingers as a result of this, can also be operated with a remote release aid that can be held in the grip of the hand. The remote release aid according to these figures showing a possible construction has a mechanism consisting of a grip 8 suitable for being held with the fingers of the hand, with a knob 12b on it protruding in a way that its end practically facing the thumb can be pushed, a flexible sleeve 12 that can transmit the movement of the knob 12b, and a cable 12a taken through the sleeve 12, which mechanism is known for example in connection with cameras, here it is based on the pushing movement of the cable 12a, as for example in accordance with the lower part of figure 8, but it can also be based on the pulling movement of the cable 12a according to the top part of figure 8 or using a given part of another solution, for which the construction of a mechanism needed and suitable for talcing over the movement of the moving finger is obvious for an average expert. It should also be obvious, if it seems more practical to construct a holding unit that can be used instead of the grip 8 and is not held in the grip of the fingers, but for example it is pulled onto the fingers. The reconstruction of the known release aids that can be used in this respect, making them suitable for the above operation should also be obvious, as shown by figure 24, which can be achieved by the appropriate lengthening of a of the trigger of a known release aid operated with the pulling movement of the index finger, by extending over the centre of rotation of the trigger, as shown in the lower part of figure 8, in which case the trigger that can be pulled by the finger can also stay there, as a result of which the release aid remains possible to use in the original known way, via a lengthening intermediate piece inserted subsequently. The connection between the release aids 1 held in the grip of the fingers and the strap 21 described herein is according to any of the solutions that are known in themselves and are obvious for an average expert, which may be represented by an intermediate piece ensuring the freedom of rotation in several directions inserted between the grip as in figures 6, 15 or 17 and the strap wrapped around the wrist, constructed as a hook either tied to both in an irremovable way or tied only to one of them but making it sure that it can be hooked on and unhooked from the other at the same time. The latter construction allows the connection of the release aid 1 according to any of the figures described to the bowstring 3 before drawing the bowstring 3, when the release aid 1 is not yet connected to the strap wrapped around the wrist. The connection is to be established only after this, for example by hooking the hook tied to the strap 21 into the appropriately constructed part of the grip 8, or by using any other method known in itself. When examining figure 6 it is obvious that further practical modifications of the release aids 1 according to the figures described are also possible, for example by using a strap 21, in a way that instead of the grip 8 the hook tied to the strap 21 can be hooked to the central house Id omitting the grip 8 and its extensions 8a, because the rotating rods 9 are also able to bear the load generated on the extreme houses Id, and in this way from the grip 8 shown in figures 24 and 25 a mechanism built directly in both extreme houses 1 d can be operated by doubling the cable 12a. The construction according to figures 26 and 27 shows an example of a mechanism constructed to transmit the movement of a finger onto a release aid 1 already known or described herein, for example a possible way of establishing a connection between the grip 8 and the release aid 1 itself, facilitating attachment to the bowstring, which connection is also appropriately stiff and adjustable in space. In the spread-out plan as in figure 26 it can be seen that between the grip 8 and the extension 8a constructed separately from it there is a tube 8h connected to the lower part of the grip, a favourably cylindrical stem 8i extending into it, two sheets 8j constructed in a way that they can be slid on each other and fixed to each other in a set position, a further stem 8i and a tube accommodating this further stem 8i in the lower part of the extension 8a and fixing it in different positions extending to different extents and set in different directions, all linked up to ensure connection. The sheets 8j can be adjusted and fixed in a way known in itself, for example with the slots 8k and the bolts extending through them and fitted into the threads situated in the other sheet 8j. In figures 26 and 27 there is also a spike 21a ensuring connection with the strap, but, for example, the strap 21 is not shown in the interest of providing a better picture. The connection between the release aid 1 and the grip 8 can ensuring adjustability can be realised in several other ways too, for example by using a connecting element that can be folded many times, like a ruler as a drawing tool used for drawing lines with a changing curvature, which consists of a cylindrical external plastic case and granular filling inside it.

The arms Ib can be kept in closed condition and then opened in the given moment with a movement of one of the fingers of the hand not only with a chain of a few parts as bodies of different solidity linked up to co-operate. It is also possible to use electric energy for this purpose, when the finger resets an electric switch, which results in the generation of power that can be produced electrically, for example directly for the movement of the slide 10, but it is also possible to use the strength of some compressed gas for the same purpose. Average experts in these fields have the necessary knowledge to assemble actual mechanisms needed for these purposes.

The different constructions described in the present description relate to a release aid 1 and equipment allowing the modification of the hand and release aid drawing length H, raising the question of sighting methods. It is especially popular in the case of geared compound bows 2 that a device with a small hole is inserted between the strands of the bow 2, as an optical sight. The archer looks through this device also paying attention to the sighting spike aimed at the target. There are also examples of archers using a glass lens as a further optical sight fitted in the place of the sighting spike, or even a sighting telescope instead of the above devices. Using the solutions according to the description, in some cases the place of the optical devices used needs to be changed. In a given case certain optical devices needed for sighting may be used fitted to the release aid according to the invention, for example to the extension 8a.

List of references

release aid Ia incline laa lever Ib arm lba arm lbb roller lbc trigger lbd duct- wall lbe recess lbf window lbg plate lbh recess lbi distance piece lbj piece lbk cylindrical pin

IbI rib lbp edge lbv arm-end Ic bore Id house

Ida recess Ie pin- bow 2a limb

2b pressure point bowstring contact point arrow cam nock grip 8a extension

8b bolt

8c slot

8d edge

8e stationary pad

8f ear

8g pin

8h tube 8i stem 8j sheet 8k slot

9 rotating rod 9a hole

10 slide 1 Oa window 10b pin 10c slot 1Od knob 1 Oe pin

11 lift arm

12 sleeve 12a cable 12b knob

13 cogged piece

14 rod 14a connecting rod 14b intermediate piece 14c slot 14d ear 14e ear

15 push-rod 15a moving pad

16 lever

17 block

18 bridle

19 ring

20 knot

21 strap 21a spike

"H" draw length

Claims

1. Release aid with at least two connection units, which connection units can be connected to the string of the bow and have an internal arrangement ensuring its condition in which it can transmit force onto the bowstring and the terminate this connection with one movement of a finger, characterised by that the distance between the contact points (4) established on the string (3) of the bow (2) is at least 24 mm.

2. Release aid as in claim 1, characterised by that the connection units have arms (Ib) belonging to the levers (laa) forming a part of the twist clamp construction that can be connected to the bowstring (3).

3. Release aid as in claim 1, characterised by that the connection elements have a hook-like element that can be suspended in front of the bowstring (3).

4. Release aid as in claim 1 , characterised by that the connection units have an element with a flexible string.

5. Release aid as in claim 2, characterised by that the arms (Ib) establishing the two contact points (4) on the same side of the bow (2) form the continuous part of a lever (laa).

6. Release aid as in claim 2, characterised by that a plate (lbg) is attached to the lever (laa) establishing the two contact points (4) from the same side of the bow (2).

7. Release aid as in claim 2, characterised by that the levers (laa) with an arm (Ib) that ca be connected to the bowstring (3) form pairs that are situated in separate houses (Id).

8. Release aid as in claim 2 or 7, characterised by that the levers (laa) on the same side of the bow (2) have a hole through which they are connected with a rotating rod (9).

9. Release aid as in claim 2, 5, 6, 7 or 8, characterised by that a slide (10) is fitted to the rollers (lbb) of the levers (laa).

10. Release aid as in claim 2, 7, 8 or 9, characterised by that the house (Id) is attached to the extension (8a) of the grip (8).

11. Release aid as in claim 2, characterised by that it has pairs of a moving pad (15a) connected to the push-rod (15) running inside the grip (8) and a stationary pad (8e) connected to the grip (8), which pairs can be attached to the bowstring (3) through the bridle (18) and/or ring (19) tied to the knots (20) of the bowstring (3).

12. Unit consisting of a release aid, a strap that can be attached to the wrist of the hand, a connecting element connecting these allowing rotation in several directions, and a grip, characterised by that the grip (8) has a knob (12b) or trigger (lbc) suitable for taking over the movement of the finger operating the release aid (1), and the grip (8) can be held by he hand with the strap attached to it (21) and allows different positions with respect to the release aid (1), and a mechanism transmitting the movement of the knob (12b) or trigger (lbc) is inserted between the release aid (1) and the grip (8).

13. Unit as in claim 12, characterised by that at least one cable 12a) running inside a sleeve (12) is connected between the release aid (1) and the grip (8).

14. Unit as in claim 12, characterised by that between the release aid 91) and the grip (8) there is a stiff connecting mechanism ensuring adjustability in several directions.

15. ^"Unit as in claim 12, characterised by that in the line of the connecting elements between the release aid (1) and the grip (8) there is a hook or other connecting element that can be released and attached without using the tool.

16. Unit as in claim 12, characterised by that between the release aid (1) and the grip (8) there is a connecting element that can be folded many times.