WO2003020374A1

WO2003020374A1 - Weight training device

Info

Publication number: WO2003020374A1
Application number: PCT/EP2002/009585
Authority: WO
Inventors: Hermann Josef Becker
Original assignee: Beckersport Fitnessprodukte Gmbh
Priority date: 2001-08-30
Filing date: 2002-08-28
Publication date: 2003-03-13
Also published as: EP1423170B1; EP1423170A1; ATE350115T1; DE50209182D1

Abstract

The weight training device has a load arm (22), mounted on a frame (10), which may pivot up and down relative to a horizontal position, on which a weight (24) is mounted such as to be adjustable in the longitudinal direction. The device further has a force application element (18), on which pushing or pulling forces of a training person (14) may be exerted and transmission members (16, 20), which transmit said forces as a torque to the load arm (22). The novelty of the invention lies in the fact that the load arm (22) is directly or indirectly supported in the horizontal position or inclined at an angle of up to about 20° by means of a stop member (28). In the supported position the weight (24) may be easily displaced by means of an automatically locking electric motor or a manual drive with a gear.

Description

Weight training exercise equipment

The invention relates to a weight training device with a load arm mounted on a frame and pivotable upwards and downwards with respect to a horizontal position, to which a weight is attached in an adjustable manner in the longitudinal direction, to a force application member, on which trainees can exert tensile or compressive forces and transmission members that transmit these forces as torque to the load arm.

Such training devices are known in various forms. They compete with electrical, hydraulic and spring devices, some of which offer greater comfort at much higher costs, but are preferred by many trainers and trainees especially with attachable weight plates. In the devices mentioned at the outset, with a load arm which can be pivoted up and down through the horizontal position during an exercise, the property which is perceived as pleasant is particularly appreciated that a large stroke is available and in the travel-load diagram when the weight is lifted from its lowest position the force to be applied is initially relatively small, increases steadily towards the horizontal position of the load arm and decreases again as it is raised to the highest position. This sinusoidally increasing and decreasing load curve, which can also be modified by changing the extreme positions of the load arm, corresponds to the physiological conditions in many exercises that the body and the limbs can exert a greater force in the central area of a movement amplitude than in the area of the end positions , d. H. with the greatest flexion or extension.

BESTATIGUNGSKOPIE The popular devices with weights and especially weight plates essentially have two related disadvantages, which have so far only been attempted to be remedied individually. One disadvantage is that in order to change the load in order to adapt to the different forces of the men and women practicing on a device one after the other, weights have to be constantly removed, added, exchanged or shifted with respect to the pivot axis of the load arm. Even the latter is difficult for weaker people because under the influence of the weight at the end of an exercise, the load arm pivots through the horizontal position to its most sloping position, so that the weight along the heavily inclined one is reduced to reduce the burden on the next exerciser Load arm must be raised. If the load arm is already in a horizontal position in the lowest position of the weight, the weight can be adjusted easily, but you do not get a long load curve with a load that initially increases from the lowest position and later falls again.

The second disadvantage of the known devices of the type mentioned at the outset is related to the first, in that at the end of an exercise, the load arm, which lowers the weight, takes the force application element into the region of an extreme position via the transmission elements. The next person exercising on the device must therefore step into the device in a strongly bent or stretched position, if necessary make certain adjustments to the device in this posture and then start from this position. Even if, at the end of an exercise, the weight is caught by a movable bearing and supports, taking into account different body dimensions, getting into a device that remains near an end position is often uncomfortable.

The object of the invention is to create a training device of the type mentioned at the outset which, while maintaining the advantageous properties of a load arm which can be pivoted through the horizontal position, offers considerably more comfort with simple means than conventional training devices of this type.

The above object is achieved in that the load arm can be supported directly or indirectly in the horizontal or up to about 20 ° inclined position by a locking member and in the supported position the weight can be moved by means of an electric motor or manual drive and a gear with self-locking.

The combination of the proposed measures places the new device on the side of the much more expensive different exercise devices in terms of comfort. Nevertheless, as far as the strength exercises to be carried out are concerned, a device with weights that can be attached to a load arm, in particular in the form of disks, has remained. Because the effective lever arm length can be changed by adjusting the weight along the load arm, the weight itself rarely needs to be changed. On the other hand, the relatively simple addition or removal of individual weight disks or disk segments makes it possible to manage with a relatively short displacement of the weight along the load arm. Locking and supporting the load arm in the horizontal position offers the double advantage of a load arm with a motor or manually adjustable weight that at the same time there are optimal conditions for entry into the device and for changing the load.

In the case of a device that is operated with a load arm that can be swiveled up and down through the horizontal position, the horizontal position is, if not exactly in the middle, independent of a possible setting of the top and bottom end positions at least in the middle range of the set movement amplitude. Accordingly, the exerciser can get in very comfortably, make any adjustments necessary to adapt to their body measurements and start the exercise from a roughly stretched position. As a rule, the settings also include a change in the maximum load torque, i. H. a shift in weight along the load arm. Since this is held in a horizontal position at the beginning of the exercise, the adjustment drive does not need any power to lift the weight. The electric motor and its switching device can be designed for minimal dimensions and amperage, or alternatively the manual drive can make do with a single turn of a handwheel or a crank, because the torque applied only has to be sufficient to reduce the friction in the drive train and in the guide to overcome the weight.

It goes without saying that, in comparison with the devices known hitherto, the success sought according to the invention is achieved to a substantial extent even if one does not create the optimal conditions, but only approximates them. by choosing a slightly inclined position of the load arm as the starting position of the device for the start of the exercises and for the adjustment of the load instead of the horizontal. If the incline remains within a range of about 20 ° to 25 °, compared to conventional devices in which the load arm is stopped in or near the most inclined position, this still allows a significantly more comfortable entry into the device and one gets there also with a comparatively small motor or manual driving force, which, however, must already be able to push the weight up along the inclined load arm. Therefore, the horizontal or approximately horizontal position of the load arm in the starting position is clearly preferable.

Normally, those exercising on weight training equipment know the stress suitable for them, and the supervisory staff has so much experience that it initially makes a suitable, easy adjustment for inexperienced persons. Nevertheless, if no safety measures have been taken, the risk cannot be entirely excluded that the locking of the load arm held in a horizontal position will be released at the beginning of an exercise and the weight will drop to its lowest position without being countered by the exerciser. Injuries can result. In order to prevent this risk, it is provided in a preferred embodiment of the invention that the locking member, which in a simple embodiment has a pawl which is effective between the load arm and the frame and can be displaced or pivoted between a locking position and a release position by a ratchet drive which can be controlled by the exercising person, is locked in the locking position against movement in the release position until one to Swiveling the load arm upwards has sufficient tensile or compressive force on the power drive element. This ensures that the exerciser, at the moment when the locking member releases the load arm, exerts the necessary force in order not to drop the load arm with the weight.

The lock mentioned above, which prevents the latch from being inadvertently or prematurely withdrawn from the locking position, can be achieved in an expedient development of the invention by means of a latching lug or recess attached to the latch, which in the locking position with the frame or the The load arm is in positive engagement and, after actuation of the ratchet drive, does not come out of engagement until the load arm begins to pivot upwards.

In the preferred practical embodiment, the pawl is a linearly displaceably guided locking bolt which is preloaded by an engagement spring towards the locking position, and the controllable pawl drive is a Bowden cable or electromagnet acting against the engagement spring. In order not to load it with transverse forces and thereby tilt it, it should act on the locking bolt if possible using a cord or a tension spring that is stronger than the engagement spring. The arrangement can also be reversed in such a way that the pawl is loaded by a spring in the direction of the release position and by a push or pull member controllable by the exerciser, e.g. B. an electromagnet or Bowden cable to be moved into the locking position.

Safety is preferably further promoted in that the load arm can be supported in more than one position by the locking member or further locking members. So can z. B. the pawl is mounted on the load arm and with several abutments arranged on a frame part on an arc, z. B. in the form of holes to be brought into engagement. Alternatively, there is the possibility that the pawl mounted on the load arm can be brought into engagement with a plurality of holes arranged in a straight row on a pivotally mounted frame part. In both cases, when an engaging spring is used, immediately after a trainee leaves his strength and he no longer actuates the Bowden cable or the electromagnetic drive of the pawl, it engages in one of the existing holes before the weight has reached a higher falling speed , In addition, the row of holes enables simple and optionally variable attachment of end stops to limit the upper and lower limits of the movement amplitude, e.g. B. exercises by patients in rehabilitation. It is understood that in kinematic reversal the pawl or another locking member is also mounted on a part of the frame and with one or more abutments, for. B. holes in a part connected to the load arm to be engaged.

In order to expand the possible uses of the training device, in a further preferred embodiment of the invention the weight can be displaced through a vertical central longitudinal plane through the pivot axis of the load arm. So you work with a two-armed load arm and thus achieve that in different exercises opposite tensile and compressive forces can be exerted on the force application member.

The drive provided according to the invention for displacing the weight along the load arm does not need to be externally appearance to occur. In the preferred practical embodiment, the load arm is formed by a square tube in which a slide guided on ball bearings can be moved in the longitudinal direction, which carries the weight on at least one pin which extends outwards through a longitudinal slot in the tube and by a nut connected to it in a rotationally fixed manner and a threaded spindle can be driven. The weight preferably consists of one or more concentrically connected weight disks arranged next to a side face of the load arm with a horizontal central longitudinal axis, expediently, disk disks arranged above and below the load arm can also advantageously be fixed on the disks.

Some exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Show it:

Figure 1 is a simplified side view of a weight training device in use.

Fig. 2 front and rear view of the load arm and 3 of the training device of FIG. 1;

4 shows a cross section through the load arm of the training device according to FIGS. 1 to 3 and the weight mounted thereon;

5 shows a longitudinal section through the load arm of the training device according to FIG. 1;

5A shows a longitudinal section on a larger scale through the essential parts of a hand dantriebs in or on the load arm of FIG. 5;

6 shows a longitudinal section through a locking member which can be used in the horizontal position for locking the load arm of the training device according to FIG. 1;

FIG. 7 shows an embodiment of the locking member modified compared to FIG. 6;

8 shows a modification of the entire arrangement for locking the load arm of the training device according to FIG. 1 in the horizontal position;

Fig. 9 shows yet another modification of the arrangement for locking the load arm of the device of FIG. 1 in the horizontal position and

10 shows a schematic illustration of a further exemplary embodiment of a training device.

The weight training device shown in FIG. 1 has a fixed frame, generally designated 10, with a seat 12 on which a person 14 sits during training. In the example, training is carried out on the device in such a way that the person 14 grasps a handle 18 attached to the free end of a power arm 16 with his hands and presses it upward. About a concentric on the swivel axis of the Power arm 16 rotatably mounted on the frame 10 shaft 20, the power arm 16 is rotatably connected to a load arm 22 which carries a weight 24 consisting of circular disks. Since the weight 24 on the same side of a vertical central longitudinal plane through the common pivot axis of the

The power arm 16 and the load arm 22 is located, the weight 24 attached to the load arm 22 is also pivoted upward when the handle 18 is pushed up.

1 has an arrangement for

Blocking and support of the load arm 22 in the horizontal position. For this purpose, the frame 10 is provided with an arcuate segment 11, in the center of which there is the shaft 20 or pivot axis of the power arm 16 and the load arm 22. The segment 11 has on its radially outer side approximately at the level of the pivot axis a bore 26 into which a locking member 28 attached to the load arm 22 engages. In this engagement or locking position, in which the load arm 22 assumes a horizontal position, the locking device 28 supports the load of the weight 24 and the load arm 22 on the arcuate segment 11 of the frame 10.

It is envisaged that the weight 24 can be moved along the load arm 22 by means of an electric motor or manual drive, while the locking member 28 holds the load arm 22 in the horizontal position. The sliding mechanism for the weight 24 and the locking member 28 will be discussed in more detail below.

2 and 3 again show the load arm 22 on a larger scale from both sides. It can be seen from FIG. 3 that the locking member 28 has a ratchet drive which is can be controlled that he either pushes a pawl 30 into the bore 26 in the frame segment 11 or withdraws from this bore. The locking member 28 is pivotally mounted on its rear end opposite the pawl 30 on a pivot axis 32 which is firmly connected to the load arm 22 and is held in the front region, behind the pawl 30, between highly resilient rubber buffers 34.

As can further be seen from FIG. 3, the segment 11 is not only provided with the bore 26, but with a relatively small pitch with further bores 36, in which the load arm 22 with the weight 24 is fixed in a plurality of inclined positions by the locking member 28 and can be supported. In addition, there is the possibility of inserting an upper end stop 38 and a lower end stop 40 into a specific hole 36, thereby limiting the movement amplitude of the load arm 22 upwards and downwards.

As can be seen from FIG. 2 in connection with FIG. 4, the load arm 22 consists in the example of a square tube 42 with a longitudinally extending, relatively wide slot 44 in the outer side wall with respect to the seat 12. In the square tube 42, a carriage 46 can be moved in the longitudinal direction, which is provided with at least one bearing pin 48 which extends outwards through the slot 44 and onto which one or more weight disks 50, 52, which have the weight 24 or one, can be attached Form part of the weight 24. One or more weight segments 54, which are circular segment-shaped in side view, can additionally be attached to the disk-shaped weights 50, 52 have the same outer circumference as the weight plates 50, 52, but leave the cross section of the square tube 42 free.

The slide 46 slides by means of one or more linear bearings 56 with ball bearings on a strong guide rod 58 which extends in the interior of the square tube 42 essentially over the length of the load arm 22 or a shorter length provided as a range of motion for the slide 46. Additional rollers 60, 62 with ball bearings mounted on the slide 46 can be provided in order to support it on the side walls and possibly also on the bottom of the square tube 42 and to remove the relatively large torque and weight of the disks 50, 52 and segments 54. The carriage 46 is driven by a nut 64 connected to it in a manner fixed against relative rotation, through which a suitable threaded spindle 66 extends, which, according to FIGS. 5 and 5A, is mounted on transverse walls 65 and 67 of the square tube 42 and can be driven by a drive 68 mounted at its end is. This can be an electric motor without a reduction gear, but preferably a high-speed motor provided with a reduction gear, or alternatively

Gear drive with a crank handle 69 or a handwheel. The spindle 66 can e.g. B. have a one- or two-start trapezoidal, flat or round thread, the pitch of which is in the range between 1/3 spindle diameter and 3/4 spindle diameter. The outside diameter of the spindle is approximately between 15 and 40 mm. Hollow spindles are preferably used for the larger diameters. The screw thread should have self-locking, otherwise a blockage or brake on the threaded spindle would have to be ensured. In the case of the manual drive, the gear transmission has one stage in the example and offers such a large speed ratio that a single revolution of the crank handle 69 or a nem handwheel provided gear is sufficient to move the carriage 46 over the length of the slot 44.

In order to obtain a drive of the slide 46 that is as free of play as possible but low in friction, the nut 64 is only fixed axially and in the direction of rotation on the slide 46 even when driven by an electric motor. It runs radially on the spindle 66 and thereby prevents jamming with it.

The backlash is achieved by dividing the nut 64 into two axially side-by-side threaded parts 77, 79, which in the opposite direction are slightly against a flange (not shown) between them, through which the spindle 66 extends, or, as in Fig 5A, screwed against two flanges 81, 83 and in this relative position z. B. be fixed by means of clamping screws 85, 87 in a bushing 89 receiving them. The last one is e.g. B. by means of a pin 91 which engages in a larger diameter hole in the carriage 46, rotatably fixed thereto. In the assembled state with a radial relative movement, for. B. with a change in weights, the threaded parts 77, 79 slide on the abutting surfaces of the flanges 81, 83.

In Fig. 6 the structure of a locking member 28 is shown schematically with a ratchet drive. It consists of a housing 70 with a longitudinal bore 72, which forms a guide for an axially displaceable locking bolt 74. A compression spring 76 inserted between the bottom of the bore 72 and the locking bolt 74 endeavors to push it outwards into the locking position. Against the spring 76 acts a Bowden cable, not shown, or an electromagnet 78, the axially movably guided iron core 80 via a flexible intermediate member 82, for. B. a cord or a tension spring, and a tie rod 84 is connected to the locking bolt 74. The Bowden cable or the electromagnet are expediently actuated by the exerciser with the foot.

The locking bolt 74 forms the above-mentioned pawl 30, which engages in the locking position in the bore 26 and the further bores 36 in the arcuate segment 11 on the frame 10 in order to fix the load arm 22 in a horizontal position or in an inclined position. The bores 26 and 36 are preferably undercut, i. H. at the entrance they have a radially inwardly projecting, annular projection that narrows the diameter in the entrance area. To the

Interacting with this projection, the locking bolt 74 is formed at its outer end with a locking lug 86 in the form of a circumferential annular bead. This fits with play through the narrowed input area of the bores 26 and 36, but engages behind the radially inwardly projecting projection in the input area of the bores in the locked state and thereby prevents the electromagnet 78, 80 from pulling the locking bolt 74 out of the bore 26 and 36, respectively As long as the weight of the load arm 22 together with the disc weights 50, 52 mounted thereon rests on it, even if the exercising person 14 actuates a Bowden cable according to FIG. 1 or the electromagnet 78, 80 via a foot switch 87 by a tensile force to exert the locking bolt 74 in the direction of its retracted neutral position. Only when the exerciser, in addition to operating the Bowden cable or foot switch 87, also presses the handle 18 so strongly that the load arm 22 with the arm 24 overcome the exerted torque and the load arm has been pivoted a little in the upward direction, the locking lug 86 comes free from the undercut input area of the bore 26 or 36, so that the Bowden cable or electromagnet 78, 80 can pull the locking bolt 74 back into the neutral position.

Alternatively, it can be provided that the locking bolt 74 is loaded by a spring in the direction of its release position and can be pushed into the locking position by a Bowden cable or electromagnet which can be actuated by the exerciser. In this case, too, the locking lug 86 offers security against the locking being released too early.

The flexible intermediate member 82 is provided in order to keep transverse forces acting on the locking bolt 74 away from the iron core 80 of the electromagnet 78. If the intermediate member 82 is a tension spring that is stronger than the compression spring 76, the electromagnet 78 can withdraw its iron core 80 immediately when the foot switch 87 is actuated. The tensioned tension spring 82 then ensures that the locking bolt 74 is withdrawn at the beginning of the lifting of the load arm 22. If the power fails or the exerciser no longer presses the Bowden cable or foot switch 87 or, alternatively, a corresponding switch attached to the handle 18, The compression spring 76 pushes the locking bolt 74 outwards again into the locking position, so that during the upward or downward movement of the load arm 22 it enters the next bore 36 or 26 which it encounters and the load arm 22 in this way against further movement blocked. The locking bolt 74 shown in FIG. 6 with a circumferential or at least upward and downward protruding tab 86 can be used on a (not shown) two-arm load arm in which the weight 24 by means of the gear mechanism 68 and the threaded spindle 66 through the vertical central longitudinal plane the pivot axis 20 can be moved through, that is, the locking bolt 74, depending on the position of the weight 74 on the two-armed load arm 22, must absorb torques acting in the opposite direction of rotation. If the training device is only intended for one type of exercise, e.g. 1 only for pushing the weight upwards, a locking pin 74 'according to FIG. 7 with a locking lug 86' projecting only downwards is sufficient. On its upper side, the locking pin 74 'is formed with an inclined surface which is selected such that it is pushed out of the hole 26 or 36 by itself when the load arm 22 is pivoted upwards, without a ratchet drive, for. B. in the form of a Bowden cable or electromagnet 78, 80 is required. In this case, the locking pin 74 'acts only on one side like a ratchet pawl preloaded by the compression spring 76 in the locking position.

The exemplary embodiment shown in FIG. 8 differs from that according to FIGS. 1 to 5 only in that a corresponding one to the arcuate segment 11 with bores 26, 36

Segment 88 is not fixed to the frame 10 but to the load arm 22, while the locking member 28 is fixed to the frame 10. The function is the same in both cases.

In the embodiment according to FIG. 9, a piece of pipe 92 is attached to the load arm 22, which can be pivoted about a horizontal axis 90, and is slidable on a floor or a part the frame sits at 94 pivotally mounted tube 96. The tube 96 or alternatively a rod is provided with a series of bores 26, 36 which are formed in the manner described above and which cooperate with a locking member 28 which in this case is fastened to the tube section 92. Since both the pipe section 92 and the pipe 96 are pivotally mounted, they can adapt to the positions that change during the pivoting of the load arm 22. In function, they correspond to segments 11 and 88.

The exemplary embodiment according to FIG. 10 has a weight-loaded load arm 22 which is not pivoted via a shaft 20 which is concentric to its pivot axis, but rather by means of a cable 98 which acts on its free end. The rope runs over a plurality of rollers 100, 102, 104 and is connected to a displaceably guided roller seat 106, on which a trainee takes a seat, who is supported with his feet on a footrest 108 during the training. The load arm 22 could in turn be blocked by means of a locking member 28 attached to a segment 11 connected to the frame 10. Alternatively, FIG. 10 shows the possibility of attaching the locking member 28 to the roller seat 106 and having it cooperate with holes 26, 36 (not shown) in a guide rail 110 of the roller seat. This example shows that the load arm 22 can be pivoted differently than via its pivot axis and / or can be locked indirectly in the horizontal position in which the weight 24 can be moved along the load arm 22 by means of the drive 64, 66, 68. It is understood that the combination of measures proposed above for locking the load arm 22 in a central, horizontal or slightly inclined position, for moving the weight 24 and for securing the arm can also be used with other training equipment with weight load.

The travels of the weight can be measured in each case on the rotation of the threaded spindle 66 and the resulting positions of the weight as a maximum effective load on the handle 18 or on another force application element, or in steps of e.g. 1 kilogram can be displayed digitally. Alternatively, according to FIG. 5A, the travel path of the weight and thus the load on the revolution of a measuring wheel 71 driven by a wheel or a shaft of the gear transmission 68 can be measured and displayed on a digital display 73. The display of the load is particularly simple if a pointer 75 movable with the carriage 46 can be moved externally visibly along a scale attached to the load arm 22 or a marking on the large input gear of the transmission 68, which rotates in each direction only in one direction, or the rotation-proof one connected handwheel cooperates with an annular scale on the load arm 22.

Claims

claims

1. strength training apparatus with a load arm (22) mounted on a frame (10) and pivotable up and down with respect to a horizontal position, to which a weight (24) is adjustably attached in the longitudinal direction, a force application member (18), to which a trainee (14) can exert tensile or compressive forces, and transmission members (16, 20) which these forces as

Torque transmitted to the load arm (22), characterized in that the load arm (22) can be supported directly or indirectly in the horizontal position or in a position inclined up to approximately 20 ° by a locking member (28) and in the supported position the weight (24) by means of an electric motor (68) or a manual drive (69) and a gear (64, 66) with self-locking.

2. Training device according to claim 1, characterized in that the load arm (22) for moving the weight (24) in an up to about 10 ° inclined position can be supported.

3. Training device according to claim 1 or 2, characterized in that the load arm (22) by the locking member (28) or further locking members can be supported in more than one position.

4. Training device according to one of claims 1 to 3, characterized in that the locking member (28) between the load arm (22) and the frame (10, 11) effective, by the exerciser (14) controllable, between a locking Animal position and a release position displaceable or pivotable pawl (26, 74, 74 ').

5. Training device according to claim 4, characterized in that the locking member (28, 26) is locked in the locking position against movement in the release position until a sufficient to pull the load arm (22) pulling or compressive force acts on the force application member (18) ,

6. Training device according to claim 5, characterized in that on the pawl (26, 74, 74 ') a latching lug (86, 86') or latching recess is attached, which in the locking position with the frame (10) or the load arm ( 22) is in positive engagement and after actuation of a

Pawl drive (76, 78, 80) only comes out of engagement at the start of the upward pivoting of the load arm (22).

7. Training device according to one of claims 4 to 6, characterized in that the pawl (26, 74) is a linearly displaceably guided locking bolt and the pawl drive has an engagement spring (76) which loads the pawl towards the locking position and which is provided by the trainee pressure or tension element to be actuated, e.g. B. a controllable electromagnet (78, 80) or a Bowden cable, counteracts.

8. Training device according to claim 7, characterized in that the pushing or pulling member (78, 80) acts via a cord or a spring (82) which is stronger than the engagement spring (76) on the locking bolt (74).

9. Training device according to claim 4 or 5, characterized in that the pawl (26, 74 ') is provided only on its upper or lower side with a locking lug (86') and is chamfered on the opposite side in such a way that when the weight is lifted ( 24) by the part of the frame (10, 11, 26, 36) or the load arm (22, 88) with which it is held in engagement by an engagement spring (76) against the force of the engagement spring (76) from the locking position can be pushed back into the release position.

10. Training device according to claim 5 or 6, characterized in that the pawl (26, 74) is a linearly displaceably guided locking bolt and the pawl drive has a pawl which releases the pawl from the locking position and which is a pressure or Tension member, e.g. B. counteracts a controllable electromagnet or a Bowden cable.

11. Training device according to one of the preceding claims, characterized in that the weight (24) is displaceable through a vertical central longitudinal plane through the pivot axis (20) of the load arm (22).

12. Training device according to one of the preceding claims, characterized in that the load arm (22) by a

Square tube (42) is formed, in which a slide (46) guided on ball bearings (56, 60, 62) can be moved in the longitudinal direction, which is supported on at least one pin (4) extending outwards through a longitudinal slot (44) in the square tube (42). 48) carries the weight (24), preferably in the form of weight plates, and by means of a rotating firmly connected to it nut (64) and a threaded spindle (66) can be driven.

13. Training device according to claim 12, characterized in that the nut on the carriage (46) axially fixed, but is held radially displaceable.

14. Training device according to claim 12 or 13, characterized in that the nut (64) has two axial threaded parts (77, 79) which to eliminate the axial play between the nut (64) and the threaded spindle (66) from opposite sides can be screwed against the slide (46, 81, 83) and fixed in this position against relative rotation.

15. Training device according to one of claims 12 to 14, characterized in that the thread of the threaded spindle

(66) has a pitch of 1/3 to 3/4 spindle diameter and, together with the nut (64), forms a screw gear with self-locking, in the case of a manual drive, the threaded spindle (66) via a handwheel or a hand crank (69) Drivable gear transmission (68) can be driven with a multiplication of the input speed and, starting from a zero position, the rotation path of the handwheel or a gear wheel or the path of the

Carriage (46) is measurable and indicates the maximum load.