DK173407B1 - Spring element made of elastic material, spring made of such spring elements, and suspension system for a training device - Google Patents

Description

in DK 173407 B1

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a spring element for the construction of a spring, which spring element is generally of elastic material and has a first and second set of holes, the spring element having a characteristic distance corresponding to the distance between the center of at least one hole in the first set. holes and furthest points thereof at the circumference of at least one hole in the second set of holes, the spring element being arranged to be coupled between a plurality of holes corresponding to the number of holes, a first set of coupling means being movable relative to another set of coupling means, in such a way that the first set of coupling means engages in the first set of holes in the spring element and the second set of coupling means engages in the second set of holes, to obtain mutual resilience between the two sets of coupling means.

From DE-PS 25 02 925 such a spring element of elastic material and with different characteristic distances is known to give the spring a stepwise non-linear characteristic. This spring element has only a single hole in each of the sets of 20 holes.

The invention further relates to a spring comprising one or more such spring elements as well as coupling means for coupling the spring to mutually movable articles.

The invention finally relates to a suspension system for a training device for receiving blows, kicks, etc., such as a boxing ball, which system comprises such a spring.

GB-PS 613,000 discloses a vibration-damping suspension comprising a first and a second resilient, preferably annular, elements which are connected between an inner and an outer coupling piece. The first element is firmly connected to both couplings, whereas the second element is firmly connected to one coupling piece and has a clearance relative to the second coupling piece. Hereby it is achieved that only the first element will yield, springs and / or dampen by mutual movement of the two couplings up to a certain motion amplitude limit value, whereas both elements will yield, springs and / or dampen when the mutual motion amplitude exceeds limit.

DK 173407 B1 2

In particular, the suspension is intended for suspension of vibrating machines, where the vibrational amplitude can grow strongly at resonance, for example when a certain speed is passed during startup or shutdown. In the manner described, a soft suspension and thus a good vibration separation is achieved during normal operation, and a stiffer suspension and thus a stronger vibration damping at large vibrational amplitudes, such as at resonance.

SE-PS 119,945 discloses an apparatus for boxing training 10 with a boxing ball suspended in springs where the strength of impact against the ball is measured, the measurement result being shown by means of lamps being lit, so that the number of lighted lamps indicates the strength of the stroke. The force of the springs can be adjusted by means of controls, but since the spring constant of these springs is not progressively increased, the box ball will be relatively rigidly suspended and will likely require the wearer to use protective equipment such as boxing gloves. At the same time, the boxing ball is likely to make several hits to different sides before falling to rest after a swing, which is uncomfortable for the user, who must take care not to be hit by the boxing ball. Finally, the registration of the box ball's fluctuations is unlikely to be accurate, as the springs are located between the box ball and the recording device, thereby transmitting the box ball's fluctuations in an unpredictable way.

25 US-PS 5,147,258 discloses a suspension for a boxing ball, the suspension comprising a ball joint and a flexible element such as a piece of an elastic hose. This suspension thus has a constant stiffness which cannot be adjusted. With such a suspension, the boxing ball will hardly fall to 30 calm after making a swing.

U.S. Patent 4,974,833 discloses a martial arts training apparatus comprising a mat of sufficient thickness to absorb blows without damaging the delivering blow. The apparatus comprises, in a number of places, devices 35 for measuring the amplitude of the motion of the mat upon impact on these places, but not the rate of movement of the mat. Furthermore, the elasticity of the training apparatus after its manufacture cannot be simply changed and the training apparatus can only be used to absorb strokes from one direction.

DE-PS 743,632 discloses an endless spring band of elastic material with two elongated holes and a connecting pin 5 engaging each hole, the pins being connected to a sprung and an unsprung part respectively in a car.

U.S. Patent No. 5,193,778 describes an elastic suspension for a silencer in a car. The suspension is a resilient plate of substantially uniform thickness, and connecting means 10 engage with holes designed as recesses in the plate. The connecting means are attached to suspended and supporting members, respectively.

The invention has for its object to provide a spring element for building a spring with more spring elements and having 15 more uniform properties in every direction in a plane. The characteristics of the spring should also be non-linear and can be adapted in a simple way as desired.

To this end, the spring element is characterized in that one of the sets of holes comprises a plurality of holes substantially lying on a circle, and the other of the sets of holes is a single substantially circular hole surrounding the center of the circle.

The location of one set of holes around the centrally located hole in the other set allows uniform spring distances to be achieved in many directions on the single spring element, and thus the spring element can be used to build a spring with uniform properties in a plane. By simply assembling the spring of spring elements with different characteristic distances, the desired characteristic can be obtained.

Claims 2-4 specify preferred embodiments of the two sets of holes in the spring element.

When the spring element is designed as claimed in claim 5, it is achieved that it can be manufactured in a particularly simple and inexpensive manner.

In accordance with claim 6, it is ensured that the durability of the spring elements is increased by reinforcing the holes at the places where the spring elements are most exposed to wear.

DK 173407 B1 4

The invention further aims to provide a spring with more uniform properties in any direction in a plane whose stiffness can be adjusted in a simple manner and where the characteristics of the spring are such that a resilient body falls relatively quickly after having made a fluctuation.

To this end, the spring comprises two or more spring elements having the same number of holes in the first set of holes and the same number of holes in the second set of holes, which spring comprises coupling means for coupling the spring to mutually movable articles, and wherein at least two of the spring elements have different characteristic distances, to obtain. stepwise progressive suspension between the two sets of coupling means, and the spring is characterized in that a first set of coupling means engages in the first set of holes and a second set of coupling means engages in the second set of holes in each of the spring elements, and the holes at least in the second set of holes at least in the spring elements whose characteristic distance is greater than the minimum characteristic distance of the spring elements is designed to leave, by the engagement, a clearance between at least a portion of the circumference of the holes and the corresponding coupling means.

Hereby it is obtained that the stiffness of the spring can be changed simply by changing the number and / or stiffness of or damping properties of the spring elements which are placed on the spring coupling means. In addition to the above, the spring can be made progressive and the progression of the spring can be adjusted in a simple way. Thus, for example, since the holes in the second set of holes in the spring element have a size and / or shape which causes the coupling means not to touch the circumference or the entire circumference of the holes, these coupling means will for certain sizes of the characteristic distance of the element and in certain positions of the two a set of coupling means relative to each other could move some distance relative to the first set of coupling means before the spring element begins to deform.

In that a spring comprises spring elements according to the invention with different characteristic distances, it is achieved that the spring constant of the spring will vary substantially in stages, in accordance with the position of the two sets of coupling means relative to each other. Thus, a curve of the spring force as a function of the mutual displacement of one set of coupling means relative to the other set of coupling means will have a number of knuckles or i. The slightest curvature changes, corresponding to the number of spring elements with different characteristic distances. Thus, the spring can be arranged to be relatively soft at small motions and stiffer at larger motions by one set of coupling means relative to the other. The characteristics of the spring can be set by selecting the number of spring elements and their characteristic distance and elasticity.

Claims 8 and 9 specify preferred embodiments of the arrangement of the two sets of holes in the spring spring elements.

The advantages set out in claim 10 provide similar advantages as stated in claim 6.

Finally, the invention aims to provide a suspension system for training apparatus for receiving 20 strokes, kicks, etc., such as a box ball, where the movement characteristic of the training device during and after stroke or kick can be easily adjusted by the user as desired and where the movement characteristic is direction independent. essentially in a plane.

To this end, the suspension system is characterized in that the training device is movably coupled to a first set of movable coupling means engaging in the first set of holes "spring elements of a spring according to the invention, and that the suspension system comprises a second set 30 of the number of holes in the the second set of holes corresponding to the number of coupling means which is substantially rigid and stationary suspended and which engages the second set of holes in the spring elements of the spring.

Since the spring in the suspension system can be brought to include spring elements with different characteristic distances, such that. the spring constant varies depending on the position relative to the rest position, the suspension system can be simply adjusted to give the training device one of the user or, for example, a trainer, desired progressive suspension or resistance characteristics.

The suspension system can, for example, be set to give the training device such a resistance characteristic that the impact resistance for small fluctuations is so modest that a boxer can use the training device without boxing gloves, while at the same time the impact resistance is so strong that he can apply a realistic force and weight in the stroke, and that the magnitude and velocity of the swing thereby become a measure of the boxer's impact strength.

Since the spring elements, when selecting the elastic material within certain limits, can provide a desired self-damping, the damping of the vibration movements of the training device can also be adjusted to some extent as desired, such that the device falls relatively quickly after making a swing. This provides the opportunity to impart a pattern of movement to the training device that is much more reminiscent of a combat opponent's movements and impact resistance than previously possible.

In claim 12, a preferred embodiment of the two sets of coupling means in the suspension system is given.

In the embodiments of the suspension system set out in claims 13-14, a suspension of the training device is obtained, which suspension is directionally independent and generally in a plane, and an accurate record of both the size and the speed of the training device's fluctuations.

In accordance with claim 15, the size and speed of the training device fluctuations can be processed, for example, displayed on a display, stored, and / or transmitted, for example for use in systematic training courses or competitions.

In the following, preferred embodiments of the spring element, of a spring comprising spring elements and of the suspension system are described with reference to the very schematic drawing, in which FIG. 1 and 2 show spring elements, FIG. 3 and 4 in the exploded view and side view respectively illustrate the principle of a spring or oscillator with linear motion; 5 shows a torsion spring element; FIG. 6 and 7, respectively, in an oblique view and a plan view showing an embodiment of a spring element according to the invention; 8 shows a further embodiment of a spring element according to the invention; FIG. 9 shows a foundation disc with coupling means for use with the spring elements of FIG. 6-8, FIG. 10 is a sectional view of a part of a suspension system according to the invention for a box ball comprising a spring according to the invention with four spring elements according to the invention, and FIG. 11 shows the suspension system of FIG. 10 mounted on a wall, and carrying a boxing ball.

Figures 1-5 explain the operation and elements of the invention for simplicity in connection with spring elements of simple design.

In FIG. 1 shows a spring element 21 for linear spring movements. The spring element 21 has two sets of holes, a first set of holes consisting of only a single circular hole 24. The second set of holes consists of two elongate holes 22, 25 in which there are reinforcements 23 of rigid material along a portion of the circumference of the holes 22.

FIG. 2 shows a second spring element 31 also intended for linear spring movements, wherein the first set of holes consists of two circular holes 34. The second set of holes 30 consists of one elongated hole 32, in which there are reinforcements 33 of rigid material along a portion of the hole. 32 circumference.

The spring elements of the invention may conveniently be made of a uniform thickness rubber sheet, and the reinforcements may, for example, consist of 35 metal shoes molded, vulcanized or glued to the rubber sheet.

In FIG. 3-4, it is illustrated how the spring elements 21 can be used together with three associated coupling means. FIG. 3 is a schematic exploded drawing, while FIG. 4 is a side view of a spring or oscillation damper 59 with linear working motion 55, 60.

Three spring elements corresponding to the element 21 are shown in FIG. 3 denoted 41-43. The associated coupling means are all in the form of coupling bars 47-49 of circular cross section. The two coupling rods 47, 48 are attached to a stationary foundation 52, here in the form of a plate with a recess 59. The foundation 52 may, for example, be tethered to a machine support as indicated by 53. The third coupling rod 49 is attached to a movable arm 54 which transmits a reciprocating movement 55 from a portion not shown. The arm 54 may, for example, form a fixedly connected portion of a vibrating motor foundation which is built into a machine having the said machine frame.

When said foundation vibrates, the vibrations 55 are then transmitted via the arm 54 to the clutch plier 49, which makes reciprocating movements shown by 50-51, while the clutch rods 47-48 are stationary. During use, the three spring elements 41-43 are mounted on the coupling rods as shown in FIG. 4. As the holes 61-63 in the first set of holes fit relatively tightly around the coupling rod 49, the center sections of the spring elements are brought about the holes 61-63 in the movements 50-51, 25 of the coupling rod 49 and thus in the movement 55 of the arm 54.

As shown in FIG. 3, the distance 44-46 in the working directions of the spring elements from the center of the first hole 61-63 to the furthest edge 56-58 of one of the other holes 64-66 is different for the three spring elements 41-43. With those shown in FIG. 3, the edge 56 of the second hole 64 of the spring element 41 will abut the coupling rod 47 in the resting position. In contrast, there will be a smaller clearance between the edge 57 of the second hole 65 of the spring element 42 and the bar 47, and a greater clearance between the edge 58 35 of the second hole 66 of the spring element 43 and the bar 47. Therefore, the edge 57 will first strike against the coupling rod 47 after a certain movement of the arm 54 with the coupling rod 49, and the edge 58 correspondingly first engage the rod 47 after a somewhat greater movement of the arm 54.

In this way, it is achieved that only the spring element 41 springs during the first portion of the swing 49 of the rod 49 to one of the 5 sides 50, 51, that two spring elements 41-42 spring during the further movement after impact of the hollow edge 57 and that all three spring elements 41- 43 springs after impact of the hole edge 58 against the coupling rod 47.

Assuming that the spring action for each of the spring elements is substantially linear, the spring constant of the composite spring with the spring elements 41-43 in the vibration damper 59 Jfig. 4) in this way incrementally increases in three steps as the three spring elements 41-43 "engage" and the composite spring is thereby made progressively stepwise.

The progression of the composite spring can be adjusted as required and desired by appropriate selection of the number of spring elements 41-43 and their distances 44-46. The distances 44-46 correspond to those in FIG. 1, 2 and 35 respectively. All these distances are measured from the center of at least one hole in the first set of holes 24, 34, 61-63 to the most distant points 56-58 on the edge of some or all holes in the the second set of holes 22, 32, 64-66, and all these distances are referred to hereinafter, for each spring element 25, its characteristic distance, the characteristic distance being then a measure of the distance between the coupling means 47-49 as the spring element begins, respectively. ceases to spring.

In order to obtain a practical and uniform definition of the characteristic distance for all embodiments of the spring elements according to the invention, the characteristic distance is calculated from the center of the first hole but to the edge of the second hole. The characteristic distance will therefore deviate from the corresponding distance between the center axes of the coupling means with% thickness of a coupling means. However, this has no practical significance for the definitions or understanding of the invention.

DK 173407 B1 10

Following the connection with FIG. 1-4, springs or vibration dampers with linear working directions can be built up. These springs or oscillation dampers can, by appropriate selection and adjustment of spring elements, be provided with virtually any desired spring force and progression. At the same time, in the manner known per se, by appropriate choice of rubber material for the spring elements, these can be given a greater or lesser self-damping, whereby the self-damping of the finished spring or vibration damper can be freely chosen within certain practical limits.

By appropriately selecting hole diameters for the first set of holes, the rubber material of the spring elements will span the coupling means, thereby holding itself in place. Nevertheless, the replacement of the elements can always be done without further ado.

Such springs and vibration dampers as described herein are useful, for example, for vibration isolation, vibration and / or shock damping, and damping of sudden movements.

FIG. 5 schematically shows a spring element 71 for building a torsion spring with torsion axis 72 which coincides with the axis of rotation symmetry 72 of the element 71. The spring element 71 is arranged on six coupling means 73-78, three of which 73-75 are stationary and three 76-78 are movable. a rotational movement 79-80 about the axis 72. The coupling means are otherwise of the same nature as described above. The two sets of three coupling means are not shown attached to foundations, corresponding to 52 and 54 in FIG. 3-4. Corresponding to the characteristic distances 25, 35 of FIG. 3-4, a characteristic angle 81 having similar properties can be defined here.

Torsion springs or vibration dampers constructed with such elements 71 will also have varied applications.

FIG. 6-7 show a spring element 1 according to the invention, wherein the first set of holes consists of a single, circular hole 4. The second set of holes consists of several elongate holes 2, in which there are reinforcements 3 of rigid material along a part DK 173407 B1 11 of the perimeter of the holes 2. Along the circumference of the circular hole 4 there is also a reinforcement 5 of rigid material.

As best seen in FIG. 6, the spring element 1 is generally flat and of uniform thickness. The working directions of the element 1 are all directions in the plane of the element 1 corresponding to the plane of the paper in FIG. 7th

The spring element 1 in FIG. 6-7 have a characteristic distance 18 which is equal to the greatest distance between points on the edge of one of the holes 2 and the center of the hole 4, which 10 corresponds to the axis of rotation symmetry axis of the element 11. The spring element 1 in FIG. 6-7 is also peculiar in that the points on the edge of the holes 2, which are farthest away from the hole 4, lie on a circle of radius corresponding to the characteristic distance 18.

FIG. 9 shows a disc 6 of rigid material, in a view similar to FIG. 7, and in the same scale.

Attached to the disc 6 are coupling means 7 which constitute the second set of coupling means. Here, the coupling means are in the form of coupling bolts 7 attached to the disk 6, for example with not shown 20 nuts on both sides of the disk 6. The means 7 are perpendicular here. the disc 6 and lying along a circle with a radius corresponding to the characteristic distance 18 of the spring element 1. If the disc 6 is now considered held and the spring element 1 is arranged with the holes 2 over the coupling bolts 7, a coupling means inserted into the hole 4 , be affected by a spring force directed back to axis 91, regardless of the direction in which the plane of the paper (in Figures 7 and 9) moves this coupling member. The spring element 1 thus acts as a return spring which can work in all working directions in said plane.

As an example of use for a spring made up of spring elements 1 below, for example, it is reviewed in FIG. 10-11 for a training device 35 such as a boxing ball. It will be apparent to those skilled in the art that the use of a planable, adjustable, progressive return spring described herein will have equivalent utility in many other connections.

DK 173407 B1 12

FIG. 10 is a sectional view of a portion of a suspension system comprising a spring constructed with four spring elements 1 (Figs. 6-7). The spring is shown in FIG. 10 shown in its unloaded state. The spring elements 1 are arranged on top of the disc 6, so that the smallest spring element, which at the same time has the smallest characteristic distance, is closest to the disc 6, while the other spring elements are arranged in successively increasing sizes.

In FIG. 11, the entire suspension system 112 is shown with the training device (box ball) 17 used by a boxer 110. On a wall 111 is supported pillars 113, on which a support 114 is mounted so that it is slidable in a vertical direction and can be held in a desired position. height. The frame 114 carries a ball joint or pivot bearing 16, in which a rod 20 is pivotally mounted. In addition, the frame 114 carries the disc 6 which carries the coupling bolts 7 and supports the spring elements 1. The arrangement of the disc 6 with the bolts 7 and the elements 1 is shown in the insert picture in FIG. 11. In the suspension system 112, these parts are covered by a screen 116 which carries a readout unit 117 with three bar graph displays 118.

Although the boxer 110 of FIG. 11 is shown wearing boxing gloves, the suspension system 112 of the invention, in contrast to known suspension systems, can be implemented without delay, so it is reasonable to use it without gloves for boxing training or training in other martial arts. A common cause of hand injuries is that the boxing ball in known suspension systems is often made quite heavy to provide a large inertial resistance, because the spring systems of the known suspension systems are not capable of providing a realistically differentiated impact resistance which varies in a desired way with the fluctuations of the boxing ball. With the spring element according to the invention this is not a problem and the ball can therefore be made so lightly that it does not damage the athlete's hands.

In the embodiment shown in FIG. 10 and in the insert image of FIG. 11 for a spring composed of the spring elements 1 according to the invention, the characteristic distance of the spring element having the smallest characteristic distance is slightly less than the radius of the circle which the coupling bolts 7 in DK 173407 B1 13 are fixed to the disc 6, is located on the. Therefore, the spring element with the smallest characteristic distance (the lower element 1 in Fig. 10 and the upper element 1 in Fig. 11) must be slightly stretched to reach the coupling bolts 7.

5 In the embodiment of FIG. 10, the spring element with the smallest characteristic radius is first placed on top of the disc 6, so that the body ~ 7 passes through the holes 2 in the second set of holes. Next, the other spring elements with increasing characteristic spacing are placed in the same manner.

10 The first set of coupling means to cooperate with the holes 4, which constitutes the first set of holes in each spring element 1, consists here of the _. a single coupling member in the form of a coupling rod 9 extending through a hole 8 in the center of the disc 6, as well as through the circular hole 4 in each of the spring-15 elements 1. In the embodiment shown in FIG. 6, the height of the reinforcement 5 is substantially the same as the thickness of the spring element, which causes the spring elements 1 to be close to each other when assembled into a spring. Alternatively, the reinforcement 5 may be formed higher than the thickness of the spring element 20, whereby the spring elements of the spring do not touch each other except at the reinforcements 5. This reduces any wear on the spring elements. In the illustrated embodiment, the reinforcements 5 are thicker than the spring elements, ensuring that the spring elements do not otherwise touch each other. Nuts 15 securing the coupling bolts 7 to the washer ensure that the lower spring member 1 does not touch the washer 6. It is seen that the reinforcements 3 at least the spring member abut the coupling bolts 7, and that the horizontal distance 19 between the coupling bolts 7 and the reinforcements 3 in the unloaded state of the spring are greater for the other spring elements.

Here, the coupling means 9 constitutes the upper end of a rod 20 which extends through the hole 8 in the disc 6 and through the first (middle) hole 4 in each of the spring elements 1.

The pivot bearing 16, which is secured to the holder 113 on the wall by means of the frame 114 (Fig. 11) with sliding shoes 115, carries the bar 20 with the coupling means 9.

DK 173407 B1 14 When the spring is loaded, ie. When the rod 20 of the clutch member 9 is pivoted about the pivot bed 16, first the smallest spring element 1 will provide a spring force or resistance. With larger pivots of the rod 20, the edge reinforcements 3 of the next spring element will abut one of the coupling bolts 7, and the spring force of the spring is now constituted by the spring forces of the two spring elements with the two least characteristic distances.

The other spring elements are similarly affected by even greater pivoting of the rod 20 by the coupling means 9.

In the embodiment shown in FIG. 10 and 11, a device for detecting and / or recording the magnitude and velocity of the fluctuations of the clutch member 9 and thereby the fluctuation of the rod 20 and the box ball 17. This device preferably comprises a part located at the upper end 15 of the clutch member 9. the substantially spherical surface 11 which is close to the surface of movement of the upper end of the coupling member 9, the radius of the surface 11 being adjusted such that the distance between the upper end of the coupling element 9 and the surface is preferably constant during the movements of the rod 20.

With means or devices arranged on the surface 11 and the upper end of the coupling means 9, respectively, the movements of the coupling means 9 can be recorded. For this purpose, several transducer systems known per se, such as electrical tow contacts, photocells with LEDs, hall elements together with surfaces magnetized in an alternating pattern, or other systems can be used.

In the embodiment shown in FIG. 10, it is preferred to use a magnet 30 10 located at the end of the coupling member 9, together with preferably concentric windings of electrical wires 12, 13, 14, which are embedded in or arranged on the spherical surface 11. Upon movement of the coupling member 9 For example, the magnet 10 induces electrical pulses in the turns 12-14, which pulses can be used to determine the magnitude and velocity of the fluctuations of the coupling member 9, but not the direction thereof.

When using the suspension system for a box ball 17, it is placed at the lower end of the rod 20. As the distance between the distance from the box ball 17 to the swing bed 16 and the distance from the swing bed 16 to the upper end of the clutch member 9 is known, the swing of the clutch member 9 is known. 9 upper end give a clear indication of the fluctuations of the boxing ball 17.

The concentric windings 12-14 of electrical wires are connected to an electronic detection and / or recording device 117 (Fig. 11), preferably with readout means. The read-out means may be acoustic such as a loudspeaker and / or visual such as displays, preferably one or more bar graph displays 118. The read-out means can, for example, read out measured values of impact velocity, impact strength (force) in a box ball 17 ) and calculated, resulting stroke efficiency. The electronic detection and / or recording device 15 may comprise or be connected to a computer, and may be used, for example, by using the box ball for competitions.

As indicated by the wiring connection 119, a computer in the recording device 117 may be connected to other computers in similar suspension systems located 20 distant from the shown suspension system 112. Thus, the performance of, for example, boxers exercising with each boxing ball can be directly compared. while the training is taking place, which gives completely new opportunities for arranging remote or team competitions between athletes who are 25 distant from each other, for example in different cities or different countries.

It is to be understood that the suspension system 112 will be capable of being carried out with the rod 20 in a horizontal position, or may be carried out in a version which is freely on the floor or 30 fixed to it.

The spring elements 1 can be made of natural rubber with a hardness of preferably 65 ° Shore for use with a box ball. The reinforcements 3 can advantageously be the same for all the spring elements 1, although they have 35 different characteristic distances 18.

Instead of the spring element 1, a spring element 100 as shown in FIG. 8. The spring element 100 has a first set of holes 101 arranged in a circular shape, corresponding to the application of the coupling bolts 7 to the disc 6. The holes 101 preferably have a diameter approximately equal to the diameter of the bolts 7.

The second set of holes of the spring member 100 consists of a single hole 102 having a diameter greater than the diameter of the corresponding coupling member; hereby the void space mentioned above arises between the edge of this hole and the corresponding coupling means. The characteristic distance 104 of the spring element is measured from the center of one of the first holes 101 to the opposite edge of the hole 102. To form a progressive spring with spring elements 100, these must have correspondingly different diameters on the holes 102. The edge of the hole 102 is preferably provided with a reinforcement 103.

A spring comprising spring elements 1 according to the invention can be used for other purposes where the return of a spring directly to its resting position is desired. In addition, spring elements 1 according to the invention can advantageously be used where many directions of operation for a spring are desired.

in

Claims (15)

A spring element (1; 100) for building a spring, said spring element being generally of elastic material and having a first (4; 101) and a second (2; 102) set of holes, the spring element having a characteristic distance (18; 104) corresponding to the distance between the center of at least one hole in the first set of holes and furthest points thereof at the circumference of at least one hole in the second set of holes, wherein the spring element (1; 100) is adapted to be coupled between a number of holes corresponding to the number of holes (7, 9) of which a first set of coupling means (7) is movable relative to a second set of coupling means (9) in such a way that the first set of coupling means (7) engages in the first set of holes (4) in the spring element and the second set of coupling means (9) engaging in the second set of holes (2), to provide mutual resilience between the two sets of coupling means (7, 9), characterized in that one of the sets of holes (2; 101. include is a plurality of holes substantially lying on a circle and the second of the sets of holes (4; 102) is a single, generally circular hole surrounding the center of the circle. A spring element according to claim 1, characterized in that the points furthest from the first hole (4) on the circumference of the holes in the second set of holes (2) 25. are substantially on a circle whose radius corresponds to that of the spring element (1). characteristic distance (18). Spring element according to claim 1 or 2, characterized in that the holes (2) in the second set of holes have an elongated shape. Spring element according to claim 1, characterized in that the second set of holes consists of a single circular hole (102) and that the center of the holes (101) in the first set of holes is substantially on a circle whose radius plus the radius of the second hole (102) corresponds to the characteristic distance (104) of the spring element (100). Spring element according to any one of the preceding claims, characterized in that the resilient material is rubber and that the spring element (1; 100) is generally in the form of a plate of substantially uniform thickness, the holes being takes the form of recesses in the plate. Spring element according to any one of the preceding claims, characterized in that one or more of the holes in one or both sets of holes have reinforcements in the form of increased thickness of the elastic material, and / or inserted parts (3; 103). of durable and / or rigid material, along or near at least part of the perimeter of the holes. A spring comprising two or more spring elements (1; 100) according to any one of the preceding claims and having the same number of holes in the first set of holes {4; 101) and the same number of holes in the second set of holes (2; 102), the spring comprising coupling means (7, 9) for coupling the spring to mutually movable articles (6, 20), and wherein at least two of the spring elements have various characteristic distances (18; 104), to provide stepwise progressive suspension between the two sets of coupling means, characterized in that a first set of coupling means (9) engages in the first set of holes (4) and a second set of coupling means ( 7) engaging in the second set of holes (2) in each of the spring elements (1; 100) and the holes at least in the second set of holes at least in the spring elements (1; 100) whose characteristic distance (18) 104) is greater than the minimum characteristic distance of the spring elements, designed to leave a clearance (19) between the at least a portion of the circumference of the holes and the corresponding coupling means (7) by the engagement. Spring according to claim 7, characterized in that, for each of the spring elements (1), points furthest from the first hole (4) on the circumference of the holes in the second set of holes (2) are substantially 35 on a circle whose radius corresponds to the characteristic distance (18) of the spring element (1). Spring according to claim 7, characterized in that for each of the spring elements (100) the second set of holes in DK 173407 B1 19 consists of a single circular hole (102) and that the center of the holes in the first set of holes (101) ) lies on a circle whose radius plus the radius of the second hole corresponds to the characteristic distance (104) of the spring element (100), and 5 that the radius of the circle is substantially the same for the different spring elements (100) of the spring. Spring according to any one of claims 7-9, characterized in that one or more holes in one or both sets of holes of the spring elements (1; 101) have reinforcements in the form of increased thickness of the elastic material. and / or inserted portions of durable and / or rigid material, along or near at least a portion of the perimeter of the holes. Suspension system for a training device for receiving blows, kicks, etc., such as a box ball (17), comprising a spring according to any one of claims 7-10, characterized in that the training device is movably coupled to a first set of movable coupling means (9) engaging in the first set of 20 holes (4) in the spring elements (1) of the spring, and the suspension system (112) comprising a second set of the number of holes corresponding to the second set of holes (2) ( 7) which is substantially rigid and stationarily suspended and which engages in the second set of holes (2) in the spring elements (1) of the spring. Suspension system according to claim 11, comprising a spring according to claim 8, characterized in that the second set of coupling means (7) is attached to a disc (6) of rigid material, the coupling means of the second set of coupling means preferably being mounted on a a circle whose radius substantially corresponds to the smallest characteristic radius of the spring elements (1) included in the spring and that the first set of coupling means consists of a single first coupling means (9) extending through a hole (8) in the disc (6). Suspension system according to claim 12, characterized in that the first coupling means (9) constitutes or is attached to a rod (20) which extends through a supporting pivot bearing (16) and supports the training device (17), and 20 DK 173407 B1 a device (10-14) for detecting and / or recording the magnitude and / or velocity of the fluctuation of the first coupling member (9) is arranged at one end of the first coupling means (9) and the rod (20), respectively; hence the fluctuations of the training device (17). Suspension system according to claim 13, characterized in that the device for detecting and / or recording the magnitude and / or velocity of the oscillation of the first coupling member (9) comprises a magnet (10) on the coupling means, arranged at its upper end, and preferably concentric windings (12-14) of electrical conductors disposed on a portion of a substantially spherical surface (11) which is adjacent to the surface of motion of the upper end of the coupling member (9), the radius of substantially spherical surface 15 being thus aligned the distance between the magnet and the surface is preferably constant during the movement of the first coupling member (9). Suspension system according to claim 14, characterized in that the windings (12-14) are connected to an electronic detection and / or recording device, such as a microcomputer, which device is preferably provided with read-out means (118) and means for calculating based on the detected and recorded sizes respectively.