EP1423170B1 - Weight training device - Google Patents

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 DEG 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

The invention relates to a weight training apparatus with a load arm mounted on a frame and pivotable upwardly and rearwardly from a lower end position through a horizontal position, to which a weight is adjustably mounted in the longitudinal direction, a force application member to which a trainer or compressive forces are exercisable, and transmission members that transmit these forces as torque to the load arm.

Such training devices are known in many forms. They compete with electric, hydraulic and spring devices, some of which offer greater comfort at significantly higher costs, but are especially preferred with attachable weight plates by many coaches and exercisers. In the above-mentioned devices with a during an exercise through the horizontal position up and down pivoting load arm especially the perceived as pleasant property is estimated that a large stroke is available and in the load-load diagram when lifting the weight of his lowest position, the applied force is initially relatively small, steadily increasing towards the horizontal position of the load arm and steadily decreases again on further lifting in the highest position. This sinusoidal rising and falling load curve, which can also be modified by changing the extreme positions of the Lastarms, in many exercises corresponds to the physiological conditions that the body and the members in the central region of a movement amplitude can apply a greater force than in the range of end positions , d. H. at the strongest flexion or extension.

The popular devices with weights and especially weights according to the preamble of claim 1, as z. As disclosed in US Pat. Nos. 3,364,747, 4,863,161 and 3,573,865, there are essentially two related drawbacks that have hitherto been attempted only to remedy individually. One disadvantage is that in order to change the load to accommodate the different forces of the men and women practicing one after the other on a device, weights must always be removed, added, replaced or relocated with respect to the pivot axis of the load arm. Even the latter is difficult for weaker persons 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 inclined position, so that the load is reduced along the maximum inclined to reduce the load on the next exerciser Lifting arm must be raised. If the load is already in the lowest position of the weight assumes a horizontal or slightly inclined position, although the weight can be easily adjusted, but you get no long load curve with a first from the lowest position out increasing and later falling again load.

The second disadvantage of the known devices of the type mentioned above is in so far as the first together, as the end of an exercise with the weight in the lower end position lowering load arm on the transmission members, the force-engaging member in the region of an extreme position entrains. The next person exercising on the device must therefore enter 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 already before it reaches its low point due to a movable bearing catching and supporting, taking into account different body dimensions, getting into a close to an end position persistent device is often uncomfortable.

The invention has for its object to provide a training device of the type mentioned above, while maintaining the advantageous properties of a pivotable through the horizontal position load arm with simple means much more comfortable than conventional such exercise equipment.

The above object is achieved by a Kraftsport - training device with the characterizing features of claim 1, wherein the load arm above the lower end position in the horizontal or up to about 20 ° inclined position by a locking member directly or indirectly supported and in the supported position the Weight is displaceable by means of an electric motor or manual drive and a transmission with self-locking.

The combination of the proposed measures places the new device, in terms of comfort, equally at the side of the much more expensive other types of exercise equipment. Nevertheless, as far as the force exercises to be performed are concerned, a device with weights that can be fastened to a load arm, in particular in the form of disks, has remained. Because the effective Hebelarmlänge is variable by adjusting the weight along the Lastarms, the weight itself rarely needs to be changed. On the other hand, the relatively simple addition or removal of individual weight discs or disc segments offers the opportunity to manage with a relatively short displacement of the weight along the load arm.

The locking and support of the load arm in the horizontal position provides in a load arm with motor or manually adjustable weight the double advantage that are given at the same time for getting into the unit and for changing the load optimal conditions.

In a device which is operated with a pivotable by the horizontal position up and down the load arm is, regardless of a multiple possible setting of the upper and lower end position, the horizontal position, if not exactly in the middle, then at least in middle range of the set movement amplitude. Accordingly, the exerciser can very comfortably get in, make any necessary adjustments to adapt to his body measurements and start from about half-stretched out position with the exercise. The settings usually also include a change in the maximum load torque, d. H. a shift of the weight along the load arm. Since this is held at the beginning of the exercise in a horizontal position, the adjustment needs no 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 hand wheel or a crank, because the applied torque only just has to be sufficient to reduce the friction in the drive train and in the guidance of the weight to overcome.

It is understood that in comparison with the previously known devices of the invention sought after success is achieved to a significant extent even if you do not create the optimal conditions, but only approaches this, by selecting 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 inclination remains within a range of about 20 ° to 25 °, this still allows for a considerably more comfortable entry into the device compared to conventional devices in which the load arm is stopped in or near the strongest inclination position, and one comes even with a relatively small motor or manual drive, but already must be able to push up the weight along the tilted 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 are familiar with the load that is appropriate for them, and the supervisor has so much experience that it first makes an appropriate, easy setting for inexperienced people. Nevertheless, if no safety measures are taken, the risk can not be completely ruled out that at the beginning of an exercise, the locking of the horizontally held load arm is released and, without being held by the exerciser, the weight falls to its lowest position. This can lead to injuries. To prevent this risk, in a preferred embodiment of the invention, it is provided that the locking member, which in a simple embodiment effective between the load arm and the frame, by a trainee controllable pawl drive between a locking position and a release position displaceable or pivotable pawl, in the Locking position is locked against movement in the release position until a for Upward pivoting of the load arm sufficient tensile or compressive force acts on the power drive member. This ensures that at the moment when the locking member releases the load arm, the trainee applies the necessary force so as not to drop the load arm with the weight.

The above-mentioned lock, which prevents inadvertent or too early retraction of the pawl from the locked position, can be achieved in an expedient development of the invention by a latch attached to the pawl or -aussparung, in the locked position with the frame or the load arm in positive engagement is and after actuation of the pawl drive only at the beginning of the upward pivoting of the load arm disengaged.

In the preferred practical embodiment, the pawl is a preloaded by a contact spring to the locking position, linearly displaceably guided locking pin and the controllable pawl drive acting against the engagement spring Bowden cable or solenoid. In order not to burden it with lateral forces and thereby tilt, he should if possible on a cord or a tension spring, which is stronger than the engagement spring act on the locking bolt. The arrangement may also be reversed such that the pawl is loaded by a spring in the direction of the release position and by a controllable by the trainees pressure or tension member, z. B. an electromagnet or Bowden cable to move into the locked position.

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

In order to expand the application possibilities 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. Thus, one works with a two-armed load arm and thus achieves that in different exercises opposite tensile and compressive forces can be exerted on the force application member.

The inventively provided drive for moving the weight along the Lastarms need not externally in appearance to step. In the preferred practical embodiment, the load arm is formed by a square tube in which a guided on ball bearings carriage is movable in the longitudinal direction, on at least one through a longitudinal slot in the tube outwardly extending pin carries the weight and by a rotatably connected to him mother and a threaded spindle is drivable. The weight consists preferably of one or more juxtaposed next to a side surface of the load arm with horizontal central longitudinal axis, concentrically connected weight discs, which are expediently additionally arranged on the discs above and below the load arm disc segments can be fixed.

Fig. 1

eine vereinfachte Seitenansicht eines Kraftsport-Trainingsgeräts im Einsatz;

Fig. 2 und 3

Vorder- und Rückansicht des Lastarms des Trainingsgeräts nach Fig. 1;

Fig. 4

einen Querschnitt durch den Lastarm des Trainingsgeräts nach Fig. 1 bis 3 sowie des daran gelagerten Gewichts;

Fig. 5

einen Längsschnitt durch den Lastarm des Trainingsgeräts nach Fig. 1;

Fig. 5A

einen Längsschnitt in größerem Maßstab durch die wesentlichen Teile eines Handantriebs in bzw. an dem Lastarm nach Fig. 5;

Fig. 6

einen Längsschnitt durch ein zur Arretierung des Lastarms des Trainingsgeräts nach Fig. 1 in der horizontalen Lage verwendbares Arretierglied;

Fig. 7

eine gegenüber Fig. 6 modifizierte Ausführungsform des Arretierglieds;

Fig. 8

eine Abwandlung der gesamten Anordnung zur Arretierung des Lastarms des Trainingsgeräts nach Fig. 1 in der horizontalen Lage;

Fig. 9

noch eine weitere Abwandlung der Anordnung zur Arretierung des Lastarms des Geräts nach Fig. 1 in der horizontalen Lage und

Fig.10

eine schematische Darstellung eines weiteren Ausführungsbeispiels eines Trainingsgeräts.

Hereinafter, some embodiments of the invention will be explained in more detail with reference to the drawing. Show it:

Fig. 1

a simplified side view of a weight training apparatus in use;

FIGS. 2 and 3

Front and rear view of the load arm of the exercise device of FIG. 1;

Fig. 4

a cross section through the load arm of the exercise device of Figure 1 and 3 and the weight mounted thereon.

Fig. 5

a longitudinal section through the load arm of the exercise device of FIG. 1;

Fig. 5A

a longitudinal section on a larger scale through the essential parts of a hand drive in or on the load arm of Fig. 5;

Fig. 6

a longitudinal section through a usable for locking the load arm of the exercise device of Figure 1 in the horizontal position locking member.

Fig. 7

a comparison with Figure 6 modified embodiment of the locking member;

Fig. 8

a modification of the entire arrangement for locking the load arm of the exercise device of Figure 1 in the horizontal position.

Fig. 9

Yet another modification of the arrangement for locking the Lastarms of the device of FIG. 1 in the horizontal position and

Figure 10

a schematic representation of another embodiment of a training device.

The weight training apparatus shown in FIG. 1 has a fixed frame, generally designated 10, with a seat 12 on which a person 14 sits during exercise. Trained on the device in the example case in such a way that the person 14 detects a mounted at the free end of a power arm 16 handle 18 with his hands and pushes up. About a concentric on the pivot axis of the Kraftarms 16 rotatably mounted on the frame 10 shaft 20 of the power arm 16 is rotatably connected to a load arm 22 which carries a 24 consisting of circular discs weight. Since the weight 24 is on the same side of a vertical central longitudinal plane through the common pivot axis of the power arm 16 and the load arm 22, when the handle 18 is pushed up, the weight 24 mounted on the load arm 22 is pivoted upwards.

The exercise device of Fig. 1 has an arrangement for blocking and supporting 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 the shaft 20 or pivot axis of the power arm 16 and load arm 22 is located. The segment 11 has on its radially outer side approximately at the level of the pivot axis, a bore 26 into which a mounted on the load arm 22 locking member 28 engages. In this engagement or locking position, in which the load arm 22 occupies 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 displaced by means of an electric motor or manual drive along the load arm 22, 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.

Fig. 2 and 3 show once again 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 latch drive, which controls so can be that he prefers a pawl 30 in the bore 26 in the frame segment 11 or retracts from this hole. The locking member 28 is pivotally mounted at its rear end opposite the pawl 30 on a fixedly connected to the load arm 22 pivot axis 32 and at the front, behind the pawl 30, held between high-load rubber buffers 34.

As further seen in Fig. 3, the segment 11 is not only provided with the bore 26, but with a relatively small pitch with further holes 36, in which the load arm 22 with the weight 24 in a plurality of inclinations determined by the locking member 28 and can be supported. In addition, it is possible to use an upper end stop 38 and a lower end stop 40 each in a particular hole 36 and thereby limit the movement amplitude of the load arm 22 up and down.

As seen in Fig. 2 in conjunction with Fig. 4, the load arm 22 in the example of a square tube 42 having a longitudinally extending, relatively wide slot 44 in the respect to the seat 12 outer side wall. In the square tube 42, a carriage 46 is movable in the longitudinal direction, which is provided with at least one through the slot 44 outwardly extending bearing pin 48 on which one or more weight plates 50, 52 are attachable, the weight 24 or a Part of the weight 24 form. On the disc-shaped weights 50, 52, one or more in side view circular segment-shaped weight segments 54 may additionally be attached, the have the same outer circumference as the weight plates 50, 52, but the cross section of the square tube 42 leave free.

The carriage 46 slides by means of one or more linear bearings 56 ball-bearing on a strong guide rod 58 which extends in the interior of the square tube 42 substantially over the length of the load arm 22 or a shorter than movement range of the carriage 46 provided length. Additional rollers 60, 62 mounted on the carriage 46 with ball bearings may be provided to support it on the side walls and possibly also at the bottom of the square tube 42 and to remove the relatively large torque and weight of the discs 50, 52 and segments 54. The drive of the carriage 46 via a non-rotatably connected to it nut 64, through which a matching threaded spindle 66 extends, mounted as shown in FIG. 5 and 5A on transverse walls 65 and 67 of the square tube 42 and driven by a mounted at the end of drive 68 is. This may be an electric motor without a reduction gear, but preferably a speed reducer provided with a reduction gear, or alternatively a gear drive with a drive by a hand crank 69 or a handwheel. The spindle 66 may, for. B. have a single or double-start trapezoidal, flat or round thread whose pitch is in the range between 1/3 spindle diameter and 3/4 spindle diameter. The outer 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 it would have to be provided for a blockage or brake on the threaded spindle. In the case of the manual drive, the gear transmission is in the example single stage and offers such a large speed ratio that a single revolution of the hand crank 69 or a Handwheel provided gear is sufficient to move the carriage 46 over the length of the slot 44.

In order to obtain a possible backlash-free, but low-friction drive of the carriage 46, even with a drive by electric motor, the nut 64 is fixed only axially and in the direction of rotation of the carriage 46. Radial it leads to the spindle 66 and thereby avoids jamming with this.

The freedom of play is achieved by the nut 64 is divided into two axially juxtaposed threaded portions 77, 79 which in the opposite direction slightly against a flange arranged between them (not shown), through which the spindle 66 extends, or, as shown in FIG 5A, screwed against two flanges 81, 83 and in this relative position z. B. by means of clamping screws 85, 87 are fixed in a receiving bushing 89. Last is z. 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, in a radial relative movement, for. As with a change in the weights, the threaded parts 77, 79 on the adjacent surfaces of the flanges 81, 83 slide.

In Fig. 6, the structure of a locking member 28 is shown schematically with latch drive. It consists of a housing 70 with a longitudinal bore 72 which forms a guide for an axially displaceable locking pin 74. An inserted between the bottom of the bore 72 and the locking pin 74 compression spring 76 strives to advance him outward 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, z. As a string or a tension spring, and a pull rod 84 is connected to the locking pin 74. The Bowden cable or the electromagnet are expediently operated by the trainees with the foot.

The locking pin 74 forms the above-mentioned pawl 30 which engages in the locking position in the bore 26 and the further holes 36 in the arcuate segment 11 on the frame 10 to fix the load arm 22 in a horizontal position or an inclined position. The holes 26 and 36 are preferably undercut, ie they have at the entrance a radially inwardly projecting, annular projection which narrows the diameter in the entrance area. To cooperate with this projection of the locking pin 74 is formed at its outer end with a locking lug 86 in the form of a circumferential annular bead. This fits with clearance through the narrowed entry region of the holes 26 and 36, but engages in the locked state, the radially inwardly projecting projection in the input region of the holes and thereby prevents the electromagnet 78, 80 withdraw the locking pin 74 from the bore 26 and 36 respectively can, as long as the weight of the load arm 22 together with the disc weights 50, 52 resting thereon, even if the exercising person 14 as shown in FIG. 1 a Bowden cable or a foot switch 87, the electromagnet 78, 80 is actuated by a tensile force on the locking bolt 74 toward its retracted neutral position to exercise. Only when the exerciser in addition to pressing the Bowden cable or foot switch 87 and the handle 18 so strong pushes up that of the load arm 22 with the weight 24 applied torque overcome and the load arm has been pivoted a little in the upward direction, the detent 86 is released from the undercut input portion of the bore 26 and 36, so that the Bowden cable or solenoid 78, 80 can retract the locking pin 74 in the neutral position.

Alternatively it can be provided that the locking pin 74 is loaded by a spring in the direction of its release position and can be advanced by a can be actuated by the trainer Bowden cable or electromagnet in the locked position. Also in this case, the locking lug 86 provides security against premature release of the lock.

The flexible intermediate member 82 is provided to keep acting on the locking pin 74 transverse forces of 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 solenoid 78 can retract its iron core 80 immediately upon actuation of the foot switch 87. The tensioned tension spring 82 then ensures at the beginning of lifting the load arm 22 for the retraction of the locking bolt 74. If the power fails or the exerciser no longer presses against the Bowden cable or foot switch 87 or alternatively attached to the handle 18, corresponding switch pushes the Compression spring 76, the locking pin 74 outwardly back into the locking position, so that during the upward or downward movement of the load arm 22 in the next hole 36 or 26, to which he meets occurs and the load arm 22 blocked in this way against further movement.

The locking bolt 74 shown in Fig. 6 with a circumferential or at least up and down projecting detent 86 can be found on a (not shown) two-armed load application, in which the weight 24 by means of the gear transmission 68 and the threaded spindle 66 through the vertical central longitudinal plane The pivot axis 20 can be moved through, so from the locking pin 74 depending on the position of the weight 74 on the two-armed load arm 22 in the opposite direction of rotation acting torques must be recorded. If the exerciser is intended for one type of exercise only, e.g. As shown in FIG. 1 only for pressing the weight upwards, a locking pin 74 'as shown in FIG. 7 with a downwardly projecting detent 86' is sufficient. On its upper side of the locking pin 74 'is formed with an inclined surface which is chosen so that it is forced upon pivoting upward of the load arm 22 by itself from the hole 26 and 36, respectively, without causing a pawl drive z. B. in the form of a Bowden cable or solenoid 78, 80 is required. The locking pin 74 'acts in this case only on one side as a biased by the compression spring 76 in the locked position pawl of a ratchet.

The embodiment shown in FIG. 8 differs from that according to FIGS. 1 to 5 only in that a segment corresponding to the arcuate segment 11 with holes 26, 36 88 is not fixed to the frame 10, but on the load arm 22, while the locking member 28 is attached to the frame 10. The function is the same in both cases.

In the embodiment of Fig. 9, a pipe piece 92 is slidably mounted on the load arm 22, pivotable about a horizontal axis 90, slidably on a floor or a part the frame is seated 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 cooperate with a in this case attached to the pipe section 92 locking member 28. Since both the tube piece 92 and the tube 96 are pivotally mounted, they can adapt to the changing during the pivoting of the load arm 22 positions. In the function they correspond to the segments 11 and 88, respectively.

The embodiment of FIG. 10 has a weight-loaded load arm 22, which is not pivoted about a concentric to its pivot axis shaft 20, but by a force acting on its free end cable 98. The cable runs over a plurality of rollers 100, 102, 104 and is connected to a slidably guided roller seat 106, on which a trainee takes a seat, which is supported during training with his feet on a footrest 108. The load arm 22 could in turn be blocked by means of a locking member 28 attached thereto on a segment 11 connected to the frame 10. Alternatively, the possibility is shown in Fig. 10, the locking member 28 to be attached to the roller seat 106 and to cooperate with holes, not shown, 26, 36 in a guide rail 110 of the rolling seat. With this example, it is shown that the load arm 22 can be pivoted other than about its pivot axis and / or can be locked indirectly in the horizontal position in which by means of the drive 64, 66, 68, the weight 24 along the Lastarms 22 is movable. It is understood that the above proposed combination of measures for locking the load arm 22 in a middle, horizontal or slightly inclined position, for moving the weight 24 and to secure the lock can also be used in other exercise equipment with weight load.

The travel paths of the weight can each be measured on the revolution of the threaded spindle 66 and the resulting positions of the weight as a maximum load on the handle 18 or on another force-applying member continuously or in steps of e.g. 1 kilogram to be displayed digitally. Alternatively, as shown in FIG. 5A, the traveling distance of the weight and thus the load on the revolution of a measuring wheel 71 driven by a wheel or a shaft of the pinion gear 68 can be measured and displayed on a digital display 73. Particularly simple is the display of the load when a movable with the carriage 46 pointer 75 is externally visible along a scale attached to the Lastarm 22 movable or a mark on the large, in each direction only one revolution exporting input gear of the transmission 68 or the rotatably connected handwheel with an annular scale on the load arm 22 cooperates.

Claims (16)

1. A weight training apparatus with a load arm (22) which is mounted on a frame (10) and which is pivotable upwards and backwards from a lower end position through a horizontal position, on which load arm a weight (24) is mounted so as to be adjustable in a longitudinal direction, with a force-application member (18) on which a training person (14) can exert pulling or pushing forces, and with transmission members (16,20) which transmit these forces as a torque to the load arm (22), characterised by a locking member (28), wherein the load arm (22) can be directly or indirectly supported above the lower end position in the horizontal position or in a position inclined up to approximately 20° by the locking member (28), and in the supported position the weight (24) can be displaced by means of an electric motor (68) or a manual drive (69) and a self-locking transmission unit (64,66).
2. A training apparatus according to Claim 1, characterised in that, in order to displace the weight (24), the load arm (22) can be supported in a position inclined up to approximately 10°.
3. A training apparatus according to Claim 1 or 2, characterised in that the load arm (22) can be supported in more than one position by the locking member (28) or further locking members.
4. A training apparatus according to any one of Claims 1 to 3, characterised in that the locking member (28) has a detent (26,74,74') which is operative between the load arm (22) and the frame (10,11), which can be controlled by the training person (14) and which is displaceable or pivotable between a locking position and a release position.
5. A training apparatus according to Claim 4, characterised in that, in the locking position, the locking member (28) is locked against movement into the release position until a pulling or pushing force sufficient to pivot the load arm (22) upwards acts on the force-application member (18).
6. A training apparatus according to Claim 5, characterised in that a locating projection (86,86') or locating recess is provided on the detent (26,74,74'), which in the locking position is in form-locking engagement with the frame (10) or the load arm (22) and after actuation of a detent drive (76,78,80) is disengaged only at the start of the upward pivoting of the load arm (22).
7. A training apparatus according to any one of Claims 4 to 6, characterised in that the detent (26, 74) is a locking pin which is guided linearly displaceably and the detent drive has an engaging spring (76) which loads the detent towards the locking position and which opposes a pushing or pulling member to be operated by the training person, for example a controllable electromagnet (78,80) or a Bowden cable.
8. A training apparatus according to Claim 7, characterised in that the pushing or pulling member (78, 80) acts on the locking pin (74) via a cord or a spring (82), which is stronger than the engaging spring (76).
9. A training apparatus according to Claim 4 or 5, characterised in that the detent (26,74') is provided with a locating projection (86') only on its upper side or underside, and on the opposite side it is bevelled so that upon lifting of the weight (24) it can be pressed back by the part of the frame (10,11,26,36) or of the load arm (22,88), with which it is held in engagement by an engaging spring (76), against the force of the engaging spring (76) from the locking position into the release position.
10. A training apparatus according to Claim 5 or 6, characterised in that the detent (26, 74) is a locking pin which is guided linearly displaceably and the detent drive has a release spring which releases the detent from the locking position and which opposes a pushing or pulling member to be operated by the training person, for example a controllable electromagnet or a Bowden cable.
11. A training apparatus according to any one of the preceding Claims, characterised in that the weight (24) can be displaced through a perpendicular centre-line plane through the pivot axis (20) of the load arm (22).
12. A training apparatus according to any one of preceding Claims, characterised in that the load arm (22) is formed by a square tube (42), in which a carriage (46) guided on ball bearings (56,60,62) can travel in a longitudinal direction, which carriage carries the weight (24), preferably in the form of weight discs, on at least one stud (48) extending outwardly through a longitudinal slot (44) in the square tube (42) and can be driven by a nut (64), which is connected therewith in a manner precluding independent rotation, and by a screw (66).
13. A training apparatus according to Claim 12, characterised in that the nut is retained axially fixed but radially displaceable on the carriage (46).
14. A training apparatus according to Claim 12 or 13, characterised in that the nut (64) has two axial threaded portions (77,79) which, in order to obviate axial play between the nut (64) and the screw (66), can be screwed from opposite sides until abutting against the carriage (46,81,83) and in this position can be locked against relative rotation.
15. A training apparatus according to any one of Claims 12 to 14, characterised in that the thread of the screw (66) has a pitch of 1/3 to 3/4 the screw diameter and together with the nut (64) forms a self-locking screw mechanism, wherein in the case of a manual drive the screw (66) can be driven via a toothed gear (68) which can be driven by a handwheel or a crank handle (69) with speed multiplication of the input speed of rotation and, starting from a zero setting, the rotary travel of the handwheel and/or of a gearwheel or the travel of the carriage (46) can be measured and in each case indicates the maximum load.
16. A training apparatus according to Claim 1, characterised in that the transmission members (16) exert the torque on a shaft (20) rotatably mounted on the frame (10) and connected to the load arm (22) in a manner precluding relative rotation.

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