DE202022106176U1 - Rowing machine with a movable stretcher - Google Patents

Abstract

Rowing machine (1) comprising:
a. a frame (10),
b. a rolling seat (20), which is mounted on the frame (10) so that it can move along a main rudder direction (2),
c. a movable rowing handle (30),
d. a braking device (40) connected to the rudder handle (30), and
e. a stretcher board (11) mounted displaceably along the main rudder direction (2), characterized in that an adjusting device (70) is provided for providing an actuating force through which the movement of the stretcher board (11) to simulate a boat propulsion force and a boat resistance force of a rowing boat on the water can be braked or accelerated.

Description

The invention relates to a rowing machine with a frame and a rolling seat, which is mounted on the frame so as to be displaceable along a main rowing direction.

A rowing machine with a frame and a movable rolling seat is well known and, for example, in US 4,396,188 disclosed. The frame has two support feet that stand firmly on a base. In a first phase of a rowing cycle (pull-through), the training person, starting from an initial position, pulls on a rowing handle, which is here connected to a rope with a braking device. The braking device creates a certain resistance that must be overcome when pulling the oar handle. When pulling through, the training person rolls backwards on the rolling seat and supports himself with his feet on a stretching board that is firmly connected to the frame. When pulling through, the trainee rolls an imaginary rowing boat towards the bow of the rowing boat. After the pull-through, a second phase (free running) follows in the rowing cycle, in which the training person rolls the rolling seat back towards the stern of the imaginary rowing boat and returns the rowing handle to the starting position. The next rowing cycle then begins with the two phases of pull-through and free-wheeling. Due to the fixed frame with the stretcher board firmly mounted on it US 4,396,188 During the rowing cycle, the trainee's center of gravity is moved back and forth in the main rowing direction and in the opposite direction.

In addition, a rowing machine is known in which the frame is not fixed, but is mounted displaceably along the main rowing direction by a carriage construction. When rowing on this rowing machine, the frame and the stretcher board mounted on it move back and forth. Two slightly tensioned rubber ropes ensure that a carriage of the carriage construction does not run undamped against the end stops for the carriage when rowing. According to a provider of the sled construction, Concept2 Deutschland GmbH from Hamburg (can be found on the Internet using the search terms “Concept2” and “slide”), the sled construction is intended to provide a more natural rowing feeling. Essentially, the center of gravity of the training person or the center of gravity of the system consisting of the frame, braking device and training person remains practically unchanged in the same place during the rowing cycle. In comparison to a rowing machine, in which the frame and the stretcher are fixed, i.e. do not move relative to the ground on which the rowing machine stands, the back and forth movement of the trainee's center of gravity relative to the solid ground is less pronounced, which is the real thing Rowing on the water should get closer.

In addition, from the EP 0 376 403 B1 or the US 5,382,210 a rowing machine with a fixed frame is known, on the one hand the movable rolling seat and on the other hand a movable unit are arranged. The movable unit includes the braking device and the stretcher. The roll seat and the unit can move relative to each other in the main rudder direction. On the rowing machine US 5,382,210 / EP 0 376 403 B1 and the rowing machine from Concept2 described above should provide a comparable rowing feeling because the trainee's center of gravity should move back and forth to approximately the same extent. Possible differences in the back and forth movement of the center of gravity may be due to the fact that the rowing machine with the sled design also has the mass of the frame moving back and forth, which influences the back and forth movement of the trainee's center of gravity. Even though this movement of the trainee's center of gravity is closer to rowing on the water than when rowing a rowing machine with a fixed frame and a fixed stretcher, there is a need to further approximate the feeling of rowing on a rowing machine to the real feeling of rowing in a boat on the water.

The invention is therefore based on the object of providing a rowing machine which simulates real rowing on the water as closely as possible.

The object on which the invention is based is achieved with the combination of features according to claim 1. Embodiments of the invention can be found in the subclaims to claim 1.

According to the invention, an adjusting device is provided for providing an adjusting force, through which the movement of the stretcher can be slowed down or accelerated to simulate a boat propulsion force and a boat resistance force of a (virtual) rowing boat on the water. The movement of the stretcher is the movement relative to a solid, stationary base that does not change when rowing on the rowing machine. The person training on the rowing machine supports themselves with their feet on the stretching board. When freewheeling, she can pull the stretcher towards her with her feet using optional foot or shoe buckles. The positioning force can be used to specifically brake and/or accelerate the movement of the stretcher in the main direction of the rudder or in the opposite direction.

In a rowing boat, the stretcher board is firmly connected to the hull of the boat. Thus, the speed of the stretcher in a rowing boat always corresponds to the boat speed of the rowing boat at all times. However, the speed of the rower, who sits in the rowing boat and rolls back and forth while rowing, differs significantly from the speed of the boat.

The invention is based on the knowledge that the boat speed of a rowing boat on the water - in addition to the shift in the center of gravity of the rower or the rowing team in the rowing boat (which is primarily due to the forward and backward rolling of the rolling seat) - depends on the boat's propulsion force and the boat's resistance force and that although the boat speed is not constant over the rowing cycle, the boat speed at the beginning of the rowing cycle corresponds to the boat speed at the end of the rowing cycle. The influence of boat propulsion force and boat resistance force on the boat speed is, according to the invention, simulated by the actuating force acting on the stretcher in the rowing machine. If no other factors are taken into account in an exemplary embodiment, the actuating force therefore represents the resultant of the boat propulsion force and the boat resistance force.

The boat speed is subject to strong fluctuations during a rowing cycle and deviates accordingly from an average boat speed. The average does not change from rowing cycle to rowing cycle when rowing at a constant stroke rate. At least the fluctuations in the mean value of adjacent rowing cycles are negligible compared to the speed fluctuations within a rowing cycle.

The boat propulsion force represents the force that is transferred from the water to the boat's hull or to the rower through the sculls or oars when rowing on the water. The boat's drag force is primarily due to the friction between the outer skin of the boat's hull and the water. As a good approximation, the boat resistance force is proportional to the square of the boat speed relative to the (still) water or - viewed in the main direction of the rudder - to the square of the difference between the boat speed and the water speed.

While the boat's propulsion force acts in the main direction of the rudder and basically contributes to the acceleration of the rowing boat, the boat's resistance force acts in the opposite direction to the main direction of the rudder and slows down the rowing boat. These two forces are superimposed by the shift in the center of gravity of the rower or rowing team relative to the rowing boat. A backward rolling movement of the rower in the freewheel towards the stern leads to an acceleration of the rowing boat, which reduces or possibly exceeds the braking effect of the friction on the boat's outer wall during the freewheel. When pulling through, i.e. in the phase of the rowing cycle in which the system consisting of the rowing boat and the rower is actively driven, the boat speed generally increases. However, a not insignificant part of the boat's propulsion force is used to build up "potential energy" when pulling through, as the rower rolls forward with great acceleration. This potential energy is only used during the subsequent free run, as the boat speed then increases due to the rower rolling backwards in the opposite direction. During the passage, only part of the boat's propulsion force is found in increasing the boat's speed.

The stretcher can be slidably mounted on the frame, with the adjusting device being assigned to the stretcher. In this exemplary embodiment, the actuating force acts directly on the stretcher. Preferably, the frame stands firmly on the ground and does not move when rowing on the rowing machine.

In one embodiment, the position of the braking device is fixed, ie. the center of gravity of the braking device remains at a fixed location. For example, the braking device can be attached to the frame, which stands firmly on the ground. The stretcher is therefore mounted so that it can move relative to the fixed braking device. The center of gravity of the braking device should be viewed as stationary, even if the position of smaller parts such as pulleys etc. may change while rowing on the rowing machine.

In one embodiment, the stretcher and the braking device form a displaceable unit. The stretcher and the brake device can only be moved back and forth as a block. Such a movable block is disclosed, for example EP 0 376 403 B1 and the US 5,382,210 .

The stretcher can be firmly connected to the frame, with a carriage construction being provided through which the frame is mounted to be displaceable along the main direction of the rudder and of course also in the opposite direction. The adjusting device is assigned to the slide construction. Since the frame and the stretcher are firmly connected to each other, there is no relative speed between the stretcher and the frame when viewed in the main direction of the rudder. A resilient mounting of the stretcher on the frame so that The stretcher can move relative to the frame by a few mm (for example up to 10 mm) should fall under this exemplary embodiment.

The following refers to the movement of the stretcher or the movement of the frame. In the embodiment in which the stretcher is firmly connected to the frame, the movement of the stretcher corresponds to the movement of the frame. In the exemplary embodiment with the stationary frame, the stretcher moves relative to the frame. In all exemplary embodiments, the stretcher is mounted so that it can move in the main direction of the rudder (and in the opposite direction) relative to a fixed point or a solid base.

The carriage construction can have a fixed frame and a movable carriage which serves to accommodate a support leg of the frame. In a rowing machine with two support feet, two carriage constructions can be used, each with one carriage construction for one support foot.

The frame can be designed in such a way that a sliding area of the carriage is at least 80 cm or at least 100 cm long, viewed in the main direction of the rudder. Tests and calculations have shown that a sliding area with a length of 120 cm is sufficient to be able to simulate rowing on water with normal forces and accelerations using the rowing machine according to the invention.

The adjusting device can have a drive. In one embodiment, the drive comprises an electric machine that can preferably work as a generator and as a motor during a rowing cycle. An electric machine makes it possible to provide an actuating force that brakes the frame (in generator operation) or drives it (in motor operation) as required. The adjusting device can have traction means through which the preferably stationary drive is connected to the carriage or the stretcher. It is also possible for the drive to be arranged on the carriage or on the stretcher and thus move with the carriage or the stretcher.

The drive can have a brake that slows down the movement of the stretcher/frame in the main rudder direction and/or in the opposite direction. The braking force of the brake is adjustable and varies during a rowing cycle. For example, it can be a disc brake with a brake disc and brake shoes, the brake shoes being pressed against the brake disc with an adjustable force.

The drive can have a rotating drive wheel which engages with a roller for the traction means. When the drive wheel rotates, the traction device pulls on the carriage and moves it accordingly. The same applies to traction devices and stretchers if the actuator is assigned to the stretcher. In this case, the traction device pulls on the stretcher and moves it accordingly.

The drive does not necessarily have to have means that positively reinforce the movement of the stretcher in one direction. In one embodiment, the drive includes a brake and is free of a motor that delivers a positive torque. During the pull-through, i.e. when the rower supports himself with his feet, the drive ensures that the foot force is counteracted by a resistance force/braking force, which can vary in the pull-through phase. The braking force acts in the main direction of the rudder, ie. When pulled, the brake delays the movement of the stretcher in the opposite direction to the main direction of the rudder. During freewheeling, in which the stretcher is pulled by the feet in the main rowing direction as the rower rolls backwards, the brake also ensures a delay in the movement of the stretcher. In this exemplary embodiment, the drive, here comprising only a brake and no motor, only has the task of specifically braking or delaying the movement of the stretcher caused by the rudder rolling back and forth.

In one exemplary embodiment, the traction means has an upper strand and a lower strand, with the upper strand preferably being connected to the stretcher/slide. The upper run preferably extends between two mutually spaced deflection rollers, at least one of which is driven by the drive. Through the upper strand and the lower strand it is possible to pull the carriage or the stretcher towards the driven deflection roller or to pull it away from the driven deflection roller via the detour of the other deflection roller.

In one exemplary embodiment, the adjusting device determines the boat driving force depending on an operating parameter of the braking device. For example, this operating parameter can be a rudder work that occurs or is performed in the braking device during the pull-through. The operating parameter can also be a progression of the resistance force that has to be overcome when the rowing handle is moved. The boat propulsion force can also represent a course that preferably depends on a rudder angle or on a rudder position of the rudder handle.

Alternatively or additionally, the boat resistance force can be derived from one of the operating parameters of the braking device. For example, a course of the boat speed and thus a course of the boat resistance force can be modeled from the rowing work incurred in the braking device during a rowing cycle.

The boat propulsion force can vary within a rowing cycle and also within the passage of the rowing cycle, for example by linking a sine function depending on the rudder angle or depending on the position of the rudder handle. The boat resistance force can also vary, for example by using the square of the non-constant boat speed as a basis to determine it.

In one exemplary embodiment, the adjusting device has a sensor that detects a relative speed at which the stretcher or the frame moves relative to the fixed base. From this relative speed and an average boat speed, a course of the (absolute) boat speed can be determined. From this, a variable boat resistance force can be determined.

The sum of the boat resistance force and the opposing boat propulsion force can correspond to the force with which the actuator moves the frame or the stretcher. Based on a rowing cycle in which the rowing boat is not accelerated or decelerated over the entire rowing cycle, the integral of the boat's resistance force and the integral of the boat's propulsion force cancel each other out. This results in an initial position of the frame or stretcher at the beginning of the rowing cycle corresponding to an end position of the frame/stretcher at the end of the rowing cycle. Accordingly, due to the superimposition of the actuating force and the inertial mass of the rower moving back and forth, the stretcher or the frame performs a closed cyclic movement relative to the stationary ground with the same start and end position.

The actuating force can also have an additional component that takes into account the inertial force of a fictitious boat weight and/or a fictitious rowing team. The actuating force can also be used to simulate that the training person is sitting on the rowing machine in a (virtual) rowing boat with several rowers who roll back and forth during a rowing cycle and thus their inertial mass has an influence on the boat speed or the speed which moves the frame or stretcher. This means that rowing a larger rowing boat with several rowers can be replicated on the rowing machine.

In one exemplary embodiment, the actuating device has a data interface for reading in external data, which can be taken into account when calculating the actuating force. For example, data from a rowing boat can be read in, which is based on the accelerations that occur during a rowing cycle. The forces that can be derived from this can be determined when determining the actuating force, so that a rowing feeling on the rowing machine according to the invention is suggested, for example, you are sitting in an eight-row rowing boat. In theory, the actuating device could also simulate the accelerations of a helmsman sitting in a rowing boat without any rolling movement.

The data can preferably be read online or virtually online, so that it is possible to row simultaneously over the Internet with another rower in a shared, fictitious rowing boat. During a simultaneous rowing stroke, the mechanical feedback between the rowers occurs via the force on the frame/stretcher of the rowing machine. This makes it possible to experience a shared rowing experience in different places. This can also make training easier, as it is not necessarily necessary for all rowers to come together and sit in the same rowing boat when it comes to coordination between the individual rowers. The feedback felt in the rowing boat between the individual rowers or between the rower and the rowing boat occurs through the modeled actuating force. Even if online rowing together cannot completely replace rowing together on the water and the knowledge/experiences gained there, online rowing can make a meaningful contribution to efficient training.

Operation under quasi-online conditions can be carried out by analyzing a previous rowing cycle and deriving values from which the actuating force for the next rowing cycle is then determined. Since the individual rowing cycles do not differ from each other or differ very little from each other when rowing uniformly, the previous rowing cycle provides very precise values.

The actuating force can be adjusted so that, taking into account the rower's rolling back and forth, the speed at which the stretcher moves creates a differential speed that is the variable boat speed of a rowing boat on the water minus an average boat speed of the rowing boat speaks. The rower on the rowing machine is therefore exposed to the accelerations that would affect him if he were rowing on the water in a rowing boat.

• 1 ein erfindungsgemäßes Rudergerät;
• 2 von oben schematisch eine Schlittenkonstruktion für das Rudergerät der 1;
• 3 von der Seite die Schlittenkonstruktion der 2;
• 4 einen schematischen Verlauf der Bootsgeschwindigkeit über der Zeit während eines Ruderzyklus;
• 5 das Rudergerät der 1 in der Nähe des vorderen Umkehrpunktes;
• 6 das Rudergerät der 1 in der Nähe des hinteren Umkehrpunktes;
• 7 ein zweites Ausführungsbeispiel für das erfindungsgemäße Rudergerät; und
• 8 ein drittes Ausführungsbeispiel für das erfindungsgemäße Rudergerät.

The invention is explained in more detail using the exemplary embodiments shown in the drawing. Show it:

• 1 a rowing machine according to the invention;
• 2 From above schematically a sled construction for the rowing machine 1 ;
• 3 from the side the carriage construction 2 ;
• 4 a schematic progression of boat speed over time during a rowing cycle;
• 5 the rowing machine 1 near the front turning point;
• 6 the rowing machine 1 near the rear turning point;
• 7 a second embodiment of the rowing machine according to the invention; and
• 8th a third embodiment of the rowing machine according to the invention.

1 shows a first embodiment of a rowing machine 1 with a frame 10, on which a rolling or rowing seat 20 is mounted in a main rowing direction 2 and displaceable in the opposite direction. A training person or a rower 3 sits on the rolling seat 20 and holds a rowing handle 30 with his hands. The rowing handle 30 is connected to a braking device 40 with a rope 31. The braking device 40 generates resistance when pulling the rudder handle 30 in the illustration 1 must be overcome to the right (in the main rudder direction 2). In other words, pulling the rudder handle 30 in the braking device 40 results in rowing power or rowing work. The braking device 40 thus represents a device which serves to provide resistance to the movement of the oar handle, at least during the pull-through.

When pulling the rowing handle 30, the rower 3 supports himself with his feet on a stretcher 11 and rolls backwards with the rolling seat (in the illustration 1 To the right). After the rower 3 has reached a rear turning point, he rolls the rolling seat 20 back towards the stretcher 11, with the rope 31 being wound up in the braking device 40. After reaching a front reversal point, the rower 3 pulls the rowing handle 30 again and pushes himself off the stretcher 11. Then he reaches the in the again 1 position shown so that a rowing cycle is completed. The start of a rowing cycle can basically be set at any time. The beginning of a rowing cycle is often set at the front turning point, which, when rowing on water, coincides with the insertion of the oars into the water (grabbing the water). The first phase of the rowing cycle, in which the rower 3 pulls on the handle 30, which begins at the front reversal point and ends at the rear reversal point, is referred to as the pull-through. The second phase of the rowing cycle (from the rear reversal point to the front reversal point) is called freewheeling.

The frame 10 has a display 12. The rower 3 can see 12 different data from the display, for example the number of strokes (number of rowing cycles per minute), the time rowed, the rowing power in watts and/or a calculated (fictitious) value for the distance rowed.

The frame 10 further has a first support foot 13 and a second support foot 14. The first support foot 13 is supported on a carriage 51 of a first carriage construction 50. In addition to the carriage 51, the carriage construction 50 has a frame 52 on which or in which the carriage 51 is slidably mounted. The frame 52 stands firmly on the floor of a training room, rowing cellar or the like and is aligned relative to the frame 10 of the rowing machine 1 in such a way that the rolling seat 20 and the carriage 51 are mounted displaceably in the same direction, namely along the main rowing direction 2. A further carriage construction 60 is provided for the second support foot 14, which, like the carriage construction 50, has a fixed frame 62 and a displaceable carriage 61. The further carriage construction 60 is also aligned with respect to the frame 10 of the rowing machine 1 and the carriage structure 50 so that the frame 10 of the rowing machine 1 can be moved in the main rowing direction 2.

The carriage construction 50 is assigned an adjusting device 70, which serves to provide an actuating force with which the movement of the carriage 51 and thus the movement of the entire system, which consists of the rowing machine 1 and the rower 3, can be influenced. No adjusting device is assigned to the further carriage construction 60. The carriage 61 should be able to move here with practically no resistance compared to the fixed frame 62.

The adjusting device 70 has a motor 71 and a control unit 72. The control unit 72 is connected to the braking device 40 or to the motor 71 via data lines 73, 74. The control unit receives signals from the braking device 40 via the data line 74. This can be done Control unit 72 receives operating parameters of the braking device 40 (for example the time course of the rudder power generated in the braking device) and takes them into account when determining the actuating force with which the movement of the first support foot 13 in or against the main rudder direction 2 is accelerated or braked. External data 4 can be read in from the adjusting device 70 via a data interface 75. For example, the external data 4 can include movement and performance parameters of another rower transmitted via the Internet with whom the rower 3 would like to virtually row together. The “mechanical” coupling between the rowers, who are only connected via the Internet and can therefore be in different locations, is achieved by the actuating force, the height and course of which is determined by the actuating device.

The 2 and 3 show schematically different views of the carriage construction 50 and parts of the adjusting device 70. The rectangular frame 52 has two longitudinal struts 53 and two cross struts 54. The carriage 51 can be moved lengthways to the longitudinal struts 53. For this purpose, the carriage 51 - shown schematically - has rollers or wheels 55.

In addition to the motor 71 designed as an electric machine, the adjusting device 70 has a band-shaped, rotating traction device 76. An upper run 77 of the traction means 76 is divided into two, with the carriage 51 being arranged between the two parts 77a, 77b of the upper run 77. The upper strand 77 extends in the main rudder direction 2 between two deflection rollers 78, 79. The deflection roller 78 is in engagement with a drive wheel 80 of the electric machine 71. When the drive wheel 80 rotates, the deflection roller 78 also rotates. A lower strand 81 of the traction means 76 extends continuously between the deflection rollers 78, 79.

On one underside, the traction means 76 can have a profile that engages in a correspondingly designed profile on the outer circumference of the deflection rollers 78, 79. The underside can also be smooth, so that there is only a frictional connection between traction means 76 and deflection roller 78. Accordingly, the traction means 76 must then be under tension so that a torque can be transmitted from the roller 78 to the traction means 76.

If the drive wheel 80 is in the representation of 3 rotates clockwise (see arrow 82), the deflection roller 78 rotates counterclockwise, with the upper run 77 pulling the carriage 51 in the direction of the electric machine 71. Around the carriage 51 in the representation of the 3 To move to the right, the drive gear 80 must rotate counterclockwise. The lower strand 81 in particular is then subjected to tension.

4 shows schematically a time course of the boat speed V _B of a rowing boat in the water during a rowing cycle. The rowing cycle begins here with the pull-through (exchanging the oars into the water). The passage is in 4 marked by the Roman symbol I. The passage is followed by the freewheel II. All factors that influence the boat speed are taken into account in the boat speed V _B. These factors are the boat propulsion force (i.e. the force that acts on the boat due to the rowing work of the rower), the boat resistance force that must be overcome in order for the rowing boat to move in the water, and the inertial mass of the boat and the rower or the forward direction - and rolling of the rower, who moves relative to the boat during the rowing cycle. An average speed V _{B ,mean can be assigned to the boat speed V B.} It can be seen that the current boat speed can deviate from the average by more than 20% during a rowing cycle.

In addition to the course of the boat speed V _B, another course V _AW is shown. This curve V _AW is intended to represent the proportion of the boat speed that can only be attributed to the boat's propulsion force and the boat's resistance force. Consequently, a distance V _R between the two curves V _B , V _AW can be equated with the influence of the rower's rolling back and forth on the boat speed V _B.

During freewheel II, the speed curve V _AW depends only on the boat's resistance force, since the oars are then not in the water and therefore no driving force can act on the boat. In this phase II, the curve V _AW has an approximately constant slope of less than zero. This means that the boat's resistance force is approximately constant in this phase and leads to a constant negative acceleration. However, the boat does not slow down in this phase, but rather has a constant boat speed over the largest area of freewheel II. The drop in boat speed caused by the boat's resistance force is compensated for by the boat-accelerating effect of the rower rolling back towards the stern

In the last phase of the freewheel, the rolling back movement is braked by supporting the feet on the stretcher 11. This force acting on the stretcher 11 slows down the boat significantly. At the end of the freewheel II or at the beginning of the pull I, the direction of the rolling movement of the rolling seat is reversed. Even at the beginning of the pull I, the influence of the rolling movement on the speed of the boat is very large, as the rower now extends his legs and exerts corresponding pressure on the stretcher 11. In the first phase of pull-through I, the boat's resistance force and the boat's propulsion force are balanced. Accordingly, the curve V _AW here has a slope equal to zero (the acceleration caused by the boat's propulsion force and the boat's resistance force is here equal to zero). Only when the rudder blades feel the right counter pressure in pull II does the speed curve V _AW increase significantly, ie. In this phase, the boat's propulsion force is significantly greater than the boat's resistance force.

Only at the end of the passage I does the boat speed V _B reach the mean value V _B,mean . This point in time is in 4 labeled P1. For practically the entire freewheel II, the boat speed V _B is greater than the average value V _B,mean . Only at the end of freewheel II, shortly before the start of run I, does the boat speed V _B fall below the mean value V _B,mean (see point P2).

In the 4 The kinematic relationships shown are represented in the rowing machine according to the invention by the actuating force acting on the frame. The actuating force here should only reflect the influence of the boat's propulsion force and the boat's resistance force on the "fictitious boat speed" of the rowing machine. The influence of the rower's rolling back and forth on the boat speed when rowing on water can be equated with the influence of the rower's rolling back and forth on the rowing machine in relation to the fixed frame of the carriage structure and therefore does not need to be replicated by the actuating force . The prerequisite for an equation is that the mass of the moving parts of the rowing machine (in the exemplary embodiment 1 These would be the frame 10 with stretcher 11, the braking device 40, the display 12, support feet 13, 14 and the carriages 51 and 61) at least approximately correspond to the mass of the rowing boat to be reproduced (the rolling seat 20 is mentally assigned to the mass of the rower) . The resultant of the boat propulsion force and the boat resistance force corresponds to the actuating force which - in the event of superimposed movement due to the rower rolling back and forth - acts on the frame 10.

If the freewheel II is to be replicated in the rowing machine according to the invention, the actuating force is equated with the boat resistance force that only needs to be taken into account here (boat driving force for the freewheel II is zero), which can be -35 N, for example. With a total weight of rower and rowing boat of 100 kg, this would lead to a deceleration a of - 0.35 m/s ² . Since the boat resistance force brakes the rowing boat and acts against the direction of travel of the rowing boat, the actuating force also acts in the rowing machine 1 according to the invention in the illustration 1 to the left, i.e. against the main direction of the rudder 2.

During pull-through I, the speed V _AW mainly has a positive slope (see 4 ), which is accompanied by a positive acceleration in the direction of travel of the rowing boat. Assuming a total weight of 100 kg, this would lead to an acceleration of a = 1.25 m/s ² with a force of 125 N. This actuating force would act in the main rowing direction 2 (fictitious direction of travel of the rowing machine), i.e. in the illustration 1 To the right.

5 is intended to represent the position of the rower 3, which corresponds to the time P2 in 4 coincides in time within the rowing cycle. The rower 3 is located immediately in front of the front reversal point, i.e. immediately before the start of the next stroke I. The carriage 51 of the carriage construction 50 should be in a first end position here. In fact, at this point in time P2, the boat speed V _B falls below the average boat speed V _B,mean , with the result that the carriage 51 now begins to move to the left in the direction of arrow 56, counter to the main direction of the rudder. The time P2 was preceded by a long phase of increased speed, which resulted in the carriage 51 being moved into this end position.

6 is intended to represent the position of the rower 3, which corresponds to the time P1 in 4 coincides in time within the rowing cycle. The rower 3 is located immediately in front of the rear reversal point, i.e. immediately before the start of the freewheel II. The carriage 51 of the carriage construction 50 should be in a second end position here. At this time P1, the current boat speed V _B intersects the average boat speed V _B,average and remains above the average boat speed practically throughout the entire freewheel II up to time P2. The carriage 51 now moves accordingly in the direction of the arrow 57 in the illustration 6 to the left in the main rudder direction 2.

The actuating force for the carriage 51, in conjunction with the inertial masses of the rowing boat (rowing machine) and the rower, causes the carriage to move at a speed that corresponds to the difference between the boat speed V _B and the average boat speed V _B,mean . This difference in speed is in the 4 until 6 marked with ΔV. The accelerations that the rower does on the rowing machine experienced correspond to the accelerations when actually rowing in a rowing boat on the water.

The 7 and 8th show further exemplary embodiments of the rowing machine according to the invention. In the 7 and 8th are for components and features that are part of the components and features of the exemplary embodiment 1 are similar or identical, the same reference numerals are used. The differences to the exemplary embodiment are discussed below 1 received. Regarding the similarities, please refer to the description of the figures above.

In contrast to the exemplary embodiment 1 the frame 10 with the first support foot 13 and the second support foot 14 stands firmly on a solid base or floor which is in the 7 and 8th is provided with the reference number 5. In the exemplary embodiment 7 The stretcher 11 and the braking device 40 are parts of a displaceable unit that can be moved back and forth in the main rudder direction 2 and in the opposite direction. The drive 71 should also be part of the displaceable unit and moves with the stretcher 11.

In the exemplary embodiment 8th the braking device 40 is firmly connected to the frame 10, here only the stretcher 11 or a stretcher carriage 15, on which the stretcher 11 is attached, is slidably mounted. The drive 71 is also arranged on the stretcher carriage 15. This drive 71 can, for example, only include a brake, which slows down the movement of the stretcher 11, which is caused by the rower 3 rolling back and forth, so that - at least to a good approximation - the influence of the boat propulsion force and the boat resistance force on the speed of the stretcher 11 or the virtual rowing boat.

Reference symbol list

1

Rowing machine

2

Rudder main direction

3

Rower/training person

4

External data

5

solid ground/ground

10

frame

11

Stretcher

12

Advertisement

13

first support foot

14

second support foot

15

Stretcher carriage

20

Rolling seat / rowing seat

30

Rowing handle

31

Rope

40

Braking device

50

Sled construction

51

Sleds

52

Frame

53

Longitudinal strut

54

Cross brace

55

role

60

further carriage construction

70

Adjusting device

71

Drive / motor

72

Control unit

73

Data line

74

Data line

75

Data interface

76

traction means

77

Upper strand (77a first part; 77b second part)

78

pulley

79

pulley

80

drive wheel

81

lower strand

82

Direction of rotation

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 4396188 [0002]
• EP 0376403 B1 [0004, 0015]
• US 5382210 [0004, 0015]

Claims (13)

Rowing machine (1) comprising: a. a frame (10), b. a rolling seat (20), which is mounted on the frame (10) so that it can move along a main rudder direction (2), c. a movable rowing handle (30), d. a braking device (40) connected to the rudder handle (30), and e. a stretcher (11) mounted displaceably along the main rudder direction (2), characterized in that an adjusting device (70) is provided for providing an actuating force through which the movement of the stretcher (11) to simulate a boat propulsion force and a boat resistance force of a rowing boat on the water can be braked or accelerated. rowing machine Claim 1 , characterized in that the stretcher (11) is slidably mounted on the frame (10), the adjusting device (70) being assigned to the stretcher (11). rowing machine (1). Claim 2 , characterized in that the position of the braking device (40) is fixed and that the stretcher (11) is mounted displaceably relative to the braking device (40). rowing machine (1). Claim 2 , characterized in that the braking device (40) and the stretcher (11) form a displaceable unit. rowing machine (1). Claim 1 , characterized in that the stretcher (11) is firmly connected to the frame (10), a carriage construction being provided through which the frame (10) is displaceably mounted along the main rudder direction (2), and the adjusting device (70) the carriage construction (50) is assigned. rowing machine (1). Claim 5 , characterized in that the carriage construction (50) has a fixed frame (52) and a displaceable carriage (52) which serves to accommodate a first support foot (13) of the frame. Rowing machine (1) according to one of the Claims 1 until 6 , characterized in that the adjusting device (70) has a drive (71) and traction means (76). rowing machine (1). Claim 7 , characterized in that the traction means (76) have an upper run (77) and a lower run (81). Rowing machine (1) according to one of the Claims 1 until 8th , characterized in that the adjusting device (70) determines the boat propulsion force and / or the boat resistance force as a function of at least one operating parameter of the braking device (40). Rowing machine (1) according to one of the Claims 1 until 9 , characterized in that the boat propulsion force and/or the boat resistance force varies within a rowing cycle. Rowing machine (1) according to one of the Claims 1 until 10 , characterized in that the adjusting device (70) has a sensor which detects a relative speed at which the stretcher moves relative to the fixed base. Rowing machine (1) according to one of the Claims 1 until 11 , characterized in that the actuating force depends on a boat weight and/or a crew weight. Rowing machine (1) according to one of the Claims 1 until 12 , characterized in that a data interface (75) is provided for reading in external data (4), which are taken into account when calculating the actuating force.

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