JPS62500358A - practice stair device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] practice stair device field of invention The present invention relates to a training device and more particularly to a fixed staircase. Regarding the practice stairs that simulate the exercises encountered during the ascent of do.

Background of the invention One practice device that simulates the motion encountered while climbing a fixed staircase is the Richard US patent issued to Richa McFeg No. 3,970,302. In this training device, one place In some cases, a hydraulically braked variable pivot lever is used. The reaction force (colLnter) is generated by actuation of the bar, otherwise by the hydraulic motor. A movable steller f (5te force) is adapted to be hydraulically provided. p) is provided on an inclined track (trαck).

In both of these cases, the steps are such that one step is dependent on the weight of the individual. or vice versa so that when the step is moved downwards, the other step is moved upwards. mechanically moved in synchrony. Matsukutsui's patent provides mechanical synchronization of steps. (phαsing) is one staircase via gooley or hydraulic motor rocket. This is accomplished by wire or chain from one staircase to another. This mechanical tuning is When one step goes up by a given amount, the other step goes down by this given amount. descend. However, if the wire or chain breaks, the steps will not support and the individual may fall from the device. Mechanical entrainment, as understood A large number of moving parts and mechanical linkages that are cumbersome and expensive to operate quickly . Additionally, the pivoted arm embodiment and hydraulic pump implementation of the Matsuzui patent Both aspects are equivalent to the effort consumed by the user's effort (gffort). as energy is absorbed, caused by temperature increases associated with use. It is difficult to implement because it does not accommodate the expansion of hydraulic fluids. Also quite a lot (51gn1 ficant) backlash is associated with the use of these two embodiments; This is a source of trouble. Additionally, pump embodiments include pumps that act symmetrically in both directions. It is extremely difficult to provide In addition, two embodiments of the matsukutsui However, the tuning device may be bulky and, in one embodiment, require con- nective storage and storage. Many machines that are not conveniently housed in a flat cage allow for easy portability. does not allow for compact packaging as it is achieved by .

Further, in any conveniently sized pivoted arm embodiment, the Climbs from 0 feet (approximately 1828 meters) to 63 feet (approximately 1920 meters) in 1 minute. 5 armrests for a 100 lb person to accommodate speed changes Pivot to adjust the reaction force (counterforcecg) to cent. The fulcrum of the arm must be varied to less than % inches (approximately 3.175 g) No, this is actually impossible. This is due to the repeatability of the reaction force setting and the reaction force being changed. severely limits the ease with which it can be done.

The repeatability of the reaction force setting is determined by the exercise physiologist and the practice training may vary from one week to the other. (1ntefLsity) often increases by only 5% or less to This is important because it progresses.

However, the device described in the above-mentioned patent does not include a rowing strength stand, a stationary training bicycle, It has advantages over other types of exercise devices such as endless belt walkies. are doing.

As further background, with respect to training bicycles, these devices are pedal-driven. and either rollers or brakes to provide the reaction force. ing. The problem with these types of training devices is that This is the extra amount of acting force required to start the wheel moving from 5top). Ru. Furthermore, in the case of brakes, after overcoming the static coefficient of friction, the brake pad or The strap (stτap) provides relatively little reaction force. Therefore, such a device is difficult to adjust.

In all of the above devices, except for starting the wheel, the reaction force The amount is not easily adjustable and is non-linear. More specifically, the above exercise Commercial vehicles are to some extent speed sensitive and have user-actuated reaction parts. The reaction force applied to is speed dependent.

For example, in gxhercycle, friction! addition of rad Since heat results in a reduced coefficient of friction during practice, the reaction force decreases substantially as the user practices. It becomes. This also applies to the elastic rim ixer cycle, this rim ixer cycle. In the cycle, the rollers form a standing wave (standing wα1) 6), which This makes the shift cycle easier to pedal.

As further background, perhaps one of the more important issues regarding home exercise equipment is that noise and vibration associated with these devices. These devices are inside the apartment. For example, when used in Before using a device, it is necessary to consider the nuisance it may cause to neighbors. Furthermore, use If a person wants to watch television or listen to the radio during practice, this practice device is sometimes very loud, so it is best to listen to either the television or the radio. Make it impossible to hear. In all of the prior art devices mentioned above, there are innately loud There are several mechanical parts and mechanical linkages. For example, bike chains, rollers and pivoted levers, these mechanical devices produce considerable noise during operation. This is one of the locations.

Summary of the invention The device has a pair of counter-moving steps along an inclined track. This is a hydraulic, quiet training staircase device. Steps are open ended -ended) system, in which , fluid from one hydraulic actuator supporting one step is metered through a variable orifice. Actuator for the other step through the supply valve (metering valτe) and vice versa, so the faster the step is actuated αte) is infinite) and controls the flow from one actuator to the other. It is linearly variable by The device features repeatability and easy adjustment of flow rates. This easy adjustability of flow rate has the advantage of fast, gentle failure prevention. to allow for fluid expansion, low noise and continuity.

A feature of this hydraulic system is that the Oriswiss restriction reduces the flow rate, which By increasing the time for descending steps. This is practice This means that the speed is slow, and therefore the equivalent climbing speed is slow. More than just exercise To achieve this, the orifice is opened to allow rapid stair climbing. child This means that the number of actuator steps per minute can be increased. and, in fact, increase it to a level that is equivalent to climbing stairs or a slope. can be added. Therefore, aerobic motion (αerobic exercise) cise) is increased with the increase in the orifice of the metering valve, thereby Heart rate, respiratory rate, and resulting caloric burn -off). Therefore this system controls the highest speed at this speed The user can practice in a very convenient manner.

Furthermore, the increased volume of hydraulic fluid that occurs as a result of the increased temperature during the exercise adapted by increasing the position of the tap. Therefore, the present invention provides that the expansion of the liquid is a simple step. Special valve gear, accumulators, or additional Adapts to the thermal expansion of hydraulic fluids during practice without cooling elements.

Importantly, the steps are synchronized hydraulically rather than mechanically. It is. The use of an all-hydraulic system without mechanical synchronization results in an exceptionally quiet and simple system. It becomes the stem. Furthermore, in its failure mode, this device will not cause an individual to fall unexpectedly. On the contrary, gently straighten it to floor level.

Hydraulic actuators utilized to support stairs or steps are hydraulic rams (deαfrL). ) or piston-cylinder can be used. Hydraulic ram is a piston cylinder In contrast to the rod seal and piston seal used in the In other words, it has only a rod seal. The use of hydraulic rams requires that the piston seal Avoids internal leakage problems associated with piston seals since they are not used. Furthermore , hydraulic rams have low manufacturing costs. External leakage questions in open-ended systems Regarding the problem, hydraulic rams have low cost piston cylinders that can damage carpets or rugs. Preferred because it permanently stops leaks that can cause damage. .

In one embodiment, the hydraulic cylinder flexibly attaches to the pace grate. The actuator rod in the hydraulic cylinder applies side pressure to the rod 1 seal. To be able to move off-axis (Off-αzis) without adding , with a 7 lexiple interconnection between the end of the hydraulic cylinder and the metering valve. There is. The main purpose of flexible mounting is to eliminate lateral pressure on the rod seal . Removing side loads increases rod seal life and avoids leakage. The leak is hydraulic pressure This is important because it is the system's main fault mode. product life factor.

The reliability of this type of mounting system also increases equipment safety and hydraulic actuator life. Add.

The compactness and stackability (stowα) of the main line learning staircase in one embodiment track to achieve a flat package. ) by parallel (1n-1ine) hydraulic cylinders all held within This is partly due to the fact that it is provided. Furthermore, for storage, the steps are The truck is foldable, and the truck is hinged. folds into a frame. The lower part of the frame tracks upwards at a predetermined angle. The upper part of the frame that extends above the truck serves to support the It is designed to serve as a handle. In a preferred embodiment, the handle is It is positioned above the center of the path of the step. various frames The system/truck folding method is described below.

When not in use, the frame is positioned parallel to and coplanar with the track. It is rotated or swung to the desired position. In one embodiment, the step is to send the entire device J specifically to the bed. Folds down to the plane of the truck so that it can be conveniently loaded under the truck. Collected. Rock the frame into position parallel to the track and the The wheels touch the floor so that the entire device can be moved like a wheelbarrow.

Main line training stairs are extremely quiet in operation due to their ease of operation; The training staircase uses steps instead of the rollers used in the aforementioned Matsukutsui patent. It can be made more quietly by using oil-impregnated wood lubricant for the pump. Wear. In one embodiment, the oil-impregnated wood skid is 60% oil by weight.

Brief description of the drawing These and other features of the invention will become clearer with reference to the detailed description given in conjunction with the drawings. It will be well understood.

Figure 1 illustrates hydraulic synchronization (p5αsing) and hinged frame geometry. Figure 2 illustrates a mechanical tuning technique. 1 is a schematic illustration of a prior art system for synchronizing stairs; FIG. 3 is a schematic illustration of the hydraulic system utilized for mechanical alignment of the stairs of FIG. Ru; Figure 4 shows the reaction force exerted on the actuator connected to the staircase moving downward. 6 is a schematic illustration of the hydraulic tuning system of FIG. 5, illustrating the direction of the hydraulic tuning;

Figure 5 shows the hydraulic actuator support for the stair step and the flexi of the actuator sump. is a schematic illustration of a stair track illustrating a bull pace pivot; Figure 6 is a schematic illustration of a flexible joint for the actuator pace of Figure 5). Ru; Figure 7 shows the folding of the frame relative to the track, and also shows the folding of the frame relative to the track. In a side view of a practice staircase illustrating the folding of steps into a flush position with Chiru; Figure 8 shows the folded or coa of this training staircase. A schematic illustration of the storage of the training stairs under the bed in the lαpsed state; Figure 9 is an example of this exercise using imaginary lines to illustrate the swinging of the frame away from the track. It is a side view of the stairs; Figure 10 schematically shows the position of the truck and the frame in the assembled position. is an example; Figure 11 is a schematic illustration of another track folding method. Figure 12 is even more so. Figure 13 is a schematic illustration of another truck folding method; Outline of the positioning of the carrying strap (5 trap) on one side of the truck in order to FIG. 14 shows a tension rod and rod seal as opposed to a compression rod and rod seal. 1 is a schematic illustration of another hydraulically tuned system using piston seals and piston seals;

detailed description Training equipment in which the counterforce against the individual is easily controlled In order to provide a convenient location and with reference to FIG. The staircase 10 comprises two tracks 12 and a frame 14. 4 shows the assembled training device on an inclined track 12 and an inclined frame 1 4 to take the A frame shape. (rap) 20 is doubly hinged at 16 and 18.

Extendable arms 22 and 24 ensure that handle portion 33 is within the track of the step. preferably positioned above the trunk at the midpoint of the step's travel. from the upper portions 26 and 28 of the upright seven-frame members 50 and 32. I'm obsessed with puppies. A bottom cross member 64 completes the bottom of the frame. In contrast, a horizontal spacing (8pαcing) member is provided in the 36, if the frame base member 36 is retained during opening of the device. Be sure to stay far enough away from the truck to prevent pinching. Then, it is set at a point adjacent to the Tonso point on the 1st.

Inclined track 12 comprises tracks generally designated 40 and 42. . Channels 44 and 46 within each track house carriages 50 and 52. I am accommodating. Stella F54 and 56 are equipped with carriages 50 and 54Vc respectively. The wide carriage is parallel (1ts-line), full-stroke hydraulic actuation. It is hydraulically supported by vessels 58 and 60.

Actuators 58 and 60 allow the individual to apply his weight to the step to be moved downwardly. for the individual, illustrated in this case by the dotted outline at 64. Hydraulically coupled to their bases by a regulating or feeding valve 62 to control the reaction force. has been done. In one embodiment, carriages 50 and 52, as described below. installed for reciprocating motion within their respective tracks with a helical fit. Ru.

In operation, the individual utilizing the training stairs is able to reduce the individual's weight by setting the valve 62. Step one step upward and downward to provide resistance. Related to this downward pressure When the step crawls to its lower limit, the individual shifts his weight upward into the step And this process is equivalent to practicing climbing stairs. It is repeated as follows.

As mentioned above, step synchronization, i.e. one step and the other step, The movement is achieved entirely fluidly, without any mechanical synchronization of the steps. . Referring to FIG. 2, in the prior art, steps 70 and 72 are performed in one step. When the step is lowered the other step is moved up to the correct range and the opposite step A cable or chain 7 running above the sea leaf 6 so that the rope moves downwardly. 4 and are mechanically inked together. Feels like climbing stairs You don't have to get one step down exactly the same amount as the other step moves down. It was found that the increase in This is a step-by-step process, as illustrated in Figures 3 and 4. to allow full hydraulic synchronization of the pumps and also provide an extremely quiet training device.

Referring to FIG. 6, in a preferred embodiment, each actuator includes a piston cylinder. Hydraulic valves as opposed to piston cylinders which have both rod and rod seals. It is mu. Each ram translates (trα-nslation) into the cylinder. This is the Rondo 8 installed for the purpose. The only sealing is as shown in the example below. It was noted that this is accomplished at the top of the actuator by head seal 82. stomach. The rod seal is the inner dimension of a conventional liquid cylinder where the piston is sealed. Because it can be manufactured cheaply with tighter tolerances than Preferred against stone seals. Under the rod in open-end systems A conventional hydraulic cylinder with a piston seal at one end, e.g. a piston cylinder Although it is possible to use the It has been found that piston seal leakage may occur.

In a closed system, even if a piston seal leak occurs, the piston seal will not leak. Stroke and synchronization requires additional circuitry and valves to return fluid to the appropriate side of the piston. Can be undone by using binos containing.

It is the end of the rod that generates the hydraulic pressure and is the only part of the actuator that the fluid acts on. It will be understood that it is the surface of one. Referring to FIG. 4, step 56 When a force is applied to the rod of actuator 60 by the weight of an individual applied to f(v) acts on the end 80 of the rod within the actuator 60. This flow rate is Depending on the pressure across the orifice 84, the pressure P1 to the left of this orifice is equal to the force f is applied to rod 78 within actuator 60 is greater than pressure P2.

With respect to actuator 5B, when a force is applied to actuator 60, the rond in actuator 60 A8 is in the lower position. By operating the device, the individual can measure his weight in step 5. 6, the weight added to step 54 is dangerous and therefore step 54 is completely There is no back pressure across the orifice 84 assuming it is unloaded. vinegar When Tetsu f54 is not loaded, the rod in actuator 60 moves in the direction of arrow 86. It moves, but the step 56 moves down and also moves upward slightly slower. Therefore step 5 There is a very small time lag between the descent of step 6 and the rise of step 54. However, , the present research results show that when the user wants to transfer his weight to this step, As long as the step is moving upwards some time before the weight is This time lag is not important because the user is not particularly concerned about the step. be. This is the case, the user's need for a practical stair climbing experience There is no need to use mechanical tuning to satisfy By stepping on the steps to dampen sudden hydraulic forces that can be applied to the end of the actuator rod by There is a cushioning air bubble at the top of each actuator. Please note that there are 87 bubbles.

When the training stairs are utilized, the hydraulic fluid within the actuator is energized.

Under normal circumstances, the fluid adapts to the expansion formed by the energy imparted to it. It is necessary to However, as illustrated in Figure 3, heat is added to the hydraulic fluid. Then, this system is hydraulically open-end (open-endgd). Therefore, the expansion of the fluid due to heat is caused by It rises only at each position of the step. The position of each step rises in the same way and caused by the same expansion in the position of rod 78 as illustrated at 92. .

Since it is an open-end hydraulic system, each step provides The amount of reaction force is the amount of energy added to the system, but is not noticeable during use. It does not become a degree. All that happens with long extended use is in the position of the step. This is a simultaneous rise. The resulting stroke expansion is a problem for the user. <, and the practice speed rαtg which is essentially a function of the flow rate through the orifice 84 ) does not affect.

The advantage of a fully hydraulic open-end system is that the climbing speed is controlled by valve 62. Practice with possible solutions and settings of valve 62 These are the repeatability of velocity and the uniformity of the reaction force exerted by the system. climb the stairs In practice, the speed at which weight is transferred by an individual will affect the reaction force to any noticeable extent. Therefore, the 8-piece training device has no effect on speed. Exercise variables (exerc ise　υαriαb1g　) is the orifice size limited by the practice. The size of the rod, the viscosity of the fluid over the operating temperature range, and the volume of the actuator All other nocellameters, such as the product, are the same.

Additionally, the force required to move the step downwards should be uniform throughout the practice cycle; And there's no starting friction to overcome. Therefore, the practice is different from most conventional techniques. It is performed smoothly and at an even speed.

Regarding safety, the most likely failure modes of this training device are: Fluid leakage around the seal, damage to the actuator, or actuator 6o.

Either failure of the interconnect line 94,96 between 58 and valve 62. this In case of breakage of some of the lines or the actuator, the result is a step downwards. Move at a controlled speed. Its speed allows it to reach the bottom of the truck without injuring the individual. Slow enough to put it down.

Track/step details Referring now to FIG. 5, a detailed cross-sectional view of two tracks 12 is illustrated. , in this figure similar reference characters refer to similar elements such as between Figures 1 and 5. It is used. Regarding the individual tracks 4o and 45, the bottom part of the track is It consists of a grate 100 forming the back part of the truck. channel 102 are attached to the plates 1 such that they are open towards each other in pairs as illustrated. 00 and the carriages 50 and 52 are formed in this manner. installed inside the truck. In one embodiment, each middle spear is It includes a double grate shape in which plates 101 and 103 are spaced apart. They are installed adjacent to each other. The carriage has a round head portion 104 - round It has a bottom corner 106. This double plate frame has slides on both sides. 108 and 110, the skids are attached to the respective tracks. It is designed to be installed with a snug fit. In a preferred embodiment, the lubricant is Made of oil-impregnated wood to eliminate noise associated with systems that use Ru. As mentioned above, the lubricant of oil-impregnated wood is about 60% oil by weight.

The actuator 58 has a top portion 112 that has a dual grate structure within a slot (not shown). The associated rod 78 is attached to the top of the carriage 52. It is adapted to be attached to section 104 at 114 . carriage 50 The double plate shape of the carriage allows the actuator 6 to As this carriage horn is moved downward, the main part of the main body of the Can extend inside. Therefore, the actuator is made relatively thin and relatively long. can be In one case, the actuator has an inner diameter of 22fi1 and a lock. The cylinder has an outer diameter of 10 mm, and the length of the actuator is 18 inches (approximately 457.2 m). The length of the rod is 15 inches (approximately 381 m).

The base 112 of each actuator is connected to a signal generator, as illustrated by dotted line 118. It is attached to the base grate 114 with a joint. Here 120 and 12 Each of the connecting lines between the actuators illustrated in It has an intermediate flexible linkage '124 to accommodate. This friend The flexible connection is illustrated in more detail in FIG.

Referring to FIG. 6, the base of the actuator 60 is provided with an annular filter 130, which The C-linda 152 is placed inside), and this (?-IJ song 52 is a rigid To limit the upward movement of washer 134, washer 134 is Apply pressure to gasket or washer 136. C-IJ y-gutsu 32 is working To restrict the downward movement of the container 60, inserter) (1nsert) 140 prevents the upward movement of the IJJ device 60.

In one embodiment, the insert 140 includes an annular 7-land 142 and an actuator 600. a cylindrical extension 144 that is friction fit to the exterior or outer dimension of the base; It is transmitted.

The resiliency of washer 136 prevents the actuator from tilting relative to base plate 114. Allows off-axis movement of actuator 60 to allow for.

Any tilting of the actuator is prevented by the elastic or flexible linkage 124. Adapted by concatenation of sibles. This shape allows limited movement of the actuator. , and wound loads caused by large manufacturing tolerances due to lateral movement within the track. This reduces the amount of leakage in the seal 82 due to wear from the volume.

Foldable for storage As mentioned above, one of the features of this training staircase is its consecrated design. Its easy stowability. all in the track Hydraulic containment means that the truck is against the support frame. Allow the device to be folded so that it can be placed in the open position. explained below 7, 9, 10, 11 and 12. As shown, there are many ways to allow this folding. Furthermore, Figure 5 and The collapsible steps, telescoping arms and wheels shown in Figure 8 are It also contributes to a compact and portable design.

Referring to FIG. 5, the Stella f56 carries the carrier at hinge points 144 and 146. It is attached to the horn 52, in which case the top part of the step is hitched at 144. It is locked. Upright support 148 is hinged at 146 , the Stella 7″56 is equipped with a flange 150 projecting downward, and the flange 150 projects downwardly. Component 150 has a slot 152 extending along its length. Step The weight of the individual on the pool will cause the bin 154 to move until the bin 154 reaches the end of the slot 152. Move in the direction of arrow 156. Therefore, step 56 is stable with respect to the individual's weight. Provide support.

Also as illustrated in FIG. 7, the steps are step 56 upward and then downward. Folds up for storage in the plane of the two tracks 12 by moving towards the can be This moves the bin 154 in the direction of arrow 160 and 56 first upwardly and then downwardly as illustrated by arrow 162. Therefore, step 56 moves to the intermediate position illustrated in phantom at 164. Move to the position. The step is then flushed with the top surface of track 12. can be moved until

Figure 7 also serves to illustrate the folded shape of the practice staircase. The frame 14 is folded flush with the track 12, and the arm 22 or 24 is Nested within a frame. fold the stairs into their folded position This is due to the action of the pivot 20 which is double bolted. double hinged The operation of pivot 20 will be described in connection with FIGS. 9 and 10.

Referring to FIG. 8, the folding training stairs 10 effectively provide a hand-operated heavy structure. The bed 170 is provided by wheels 38 and telescoping handles 22 and 24. can be easily positioned under the

Referring now to FIG. 9, in one embodiment the structure as illustrated in FIG. The assembly of the practice staircase from the fixed position to its working position is illustrated by the point outline. Swinging of the frame 14 from the track 12 (5w1-9g ingαway) including. To accomplish this, hinge straps 20 are removed from the truck to the frame. are rotated in the direction of arrow 182 so as to separate them. This movement is also indicated by arrow 18 4. Still other movements as exemplified by arrow 18B are The frame is rotated about pivot 18 as illustrated by arrow 190. The frame 12 is then rotated to a position as illustrated by the point outline 188. Melt.

When in place, the end 192 of the track 12 presents an extremely stable shape. abuts surface 194 of frame 12 to provide support.

As illustrated in FIG. 10, the stability of the embodiment of FIG. Compression of member 192 against grate 196 held on surface 194 of 32 Partially provided. Here, the member 192 is wedged against the surface of the grate 196. stopped and flush with the frame 12 by rotation of the frame 12 in the direction of arrow 200. It is a cross member having a flat surface 196 that is reeded and compressed. Part 1 The downward movement of the lower edge 2o2 of 92 is limited by the stop 204 and thus When surface 198 is coplanar with plane 196, the downward travel of member 192 is limited. This compression and downward limit stop provides an exceptionally stable assembly. provide (stταpped) arched shape of the double-hinged strap The stability of this type of striped fit, which utilizes the By means of cross gears 34 running horizontally on the track 12 of FIG. This is aided by a horizontally running sr -+-3q against the lower edge of. In addition, The inside plane of the engine is pressed against the side of the truck on either side and the engine - Since the truck is barraged, the hinges are tightened tightly against the truck. and laterally by the structural rigidity provided by the horizontal spacing members 36. movement in the direction is prevented. Therefore, the lateral movement of the training stairs is the stock f(strα p) and two horizontally running members in contact with the floor; Traps clamp the track against the frame, so overall stability is upright Provided by compression of the ends of the track together with the frame members. The strap is Note the limited separation between the bottom of the rack and the frame.

Referring now to Figure 11, the hinge attachment of the truck to the frame consists of two It can be carried out by the use of four straps as opposed to one.

The use of four par linkages prevents any unexpected movement of the frame to the track. Since it also eliminates movement, this device cannot be installed improperly. this is During folding, control from a position perpendicular to the track to a position parallel to the track moves with a controlled motion, eliminating the need for any skill on the part of the user of the device. leave Additionally, the four bar linkage provides positive operation in the open and closed positions. itive) positioning. In this embodiment a rigid strap 2 05 pins to track 12 at 206 and 7 frame 14 at 208. Being botted. A second rigid strap 209 is attached to the frame 1 at 210. 2 and pivoted to track 14 at 211, so the frame When 14 is moved towards frame 12, it moves from its working position to its folded position. When moving to the folded position it follows a fixed set of angular orientations relative to the frame. Yes, and vice versa. The angular orientation of this set includes four straps and The frame is easy to assemble and fold as it is established by utilizing multiple hinge points such as It does not slosh around sloppily at many different angles during storage. by this What is achieved is that when the frame meets the track in the working position the frame The orientation of the frame relative to the track is set such that the frame is at the proper angular orientation α. is established at a predetermined angle. Part way from the track due to frame shaking When the frame is at 14' of the Take the angular orientation β with respect to the track. The strap 206 is the strap 205 to prevent the frame from assuming the angular position γ when is in the 205' position. I want to be noticed. Therefore, the frame is folded between the folded position and the open position. Don't let it swing loosely. The frame swings inward toward the track. Similarly, at 14", the position is maintained by the four straps. so it comes to rest parallel to the truck.

To aid in the stability of the assembled device, block 213 is connected to stock f205. The strug 205 is positioned to limit upward movement of the strug 205. When the frame 14 comes to rest against the bottom edge of the 10 track 213, the frame 14 and in the correct position.

In other embodiments, and referring now to FIG. 12, frame 214 is It can be divided into an arm 215 and a leg 216 as illustrated. Arm 2 15 is pivoted to track 217 at pivot point 218, and In contrast, the legs 216 at pivot points (one of which is indicated at 219) It has been pivoted to track 217. Stable pars 220 and 221 provide lateral stability They are respectively provided between the arm and the leg for the purpose of giving. The arms and legs are a common releasably engaged assembly mounted through slot 225 in rack 217; For example, by strugs 222 and 223, which have a hinge pin 224 that can maintained in the indicated position. The other ends of straps 222 and 223 are pivotably attached to the leg 216 at 226 and to the arm at 227; There is.

In operation, the hinge bin 224 was illustrated by the force applied to the leg 216. 225 at the end of the slot 225. This also keeps the arm in place. a When it is desired to fold and fold the arms and legs into a truck, the hinge bin 22 4 in the direction of arrow 228 as the arm and leg are moved in the direction of arrow 229. Move.

In this embodiment, the arms and legs provide an extremely compact, portable device. In order to do this, place the clam shell (Cα1m, 5hall) down on the plane of the truck. It can be folded to the side. Assembly of the device is shown in FIG. 12 simply off the track. It only requires movement of the arms and legs into the desired position.

The foregoing means that the struts and arms can be easily folded into trucks for storage. We present a collapsible, convenient and portable practice staircase that can be There are many other ways to serve.

Regarding portability, the rear side of the track plate 100, as shown in FIG. Portion 201 is mounted in a halves so that the entire device can be held as illustrated in this figure. A handle 203 can be provided.

Referring now to FIG. 14, in other embodiments steps 2'5 and 2 32 can be suspended from hydraulic cylinders 234 and 236, respectively, and each Each step is connected to a respective cylinder by rods 236 and 238, respectively. It is designed to be combined with A two-stone seal 240 is installed at the end of each rod. The end of the cylinder is attached to the cross member 242 within the frame 244. It is being Valve 246 paces cylinder 234 at point 250 and points 2 Intermediately in line 248 connecting to the base of cylinder 236 at 52 It has been placed. Rods 236 and 238 are connected to step frames 254 and 238, respectively. 256 at their other ends.

In this embodiment the cylinder is lowered from the top of the frame and the cylinder is lowered from the top of the frame and The top is supported by a rod under tension. A rod in tension is in compression The rod can be made smaller than the state rods, resulting in lower weight and lower cost. It will be understood. Also by cylinder lowering and tension rod. , a convenient self-alignment of the rods within their respective cylinders (self-α lignment).

Further, in the embodiment of FIG. 14, the hydraulic pressure is typically applied to the hydraulic ram of FIGS. (ROM) implementation. The reason for this is the effectiveness of the piston. The area should be larger in the f-ston cylinder than in the hydraulic ram. This is because it can be done. Lower operating pressures increase equipment life and are therefore advantageous.

Furthermore, the effect of thermal expansion on the stroke is due to the displacement-type of reliable operation. ent) The piston-cylinder embodiment also has less weight compared to the cylinder. can be done. In one embodiment, the thermal expansion is post-1ivg. is the sum of @expansion for a positive displacement cylinder embodiment.

Yet another advantage over cylinder suspension is the ability to handle complex vertical inspections (plum bing), the ability to place the conditioned pulp in a more convenient location that is therefore less expensive It is.

Although preferred embodiments and embodiments of the invention have been set forth above, modifications and selections may be made within the spirit of the invention. It will be conceivable to those skilled in the art that this can be done. Therefore, the following It is intended that the scope of the invention be defined only as indicated in the claims below.

May 30, 1986

Claims (10)

[Claims] 1. In practice equipment, A pair of side-by-side trucks; 1 each mounted translatably in a different track of said track. With a pair of steps; one pair of hydraulic actuators for each step; provided that each actuator has a cylinder and a rod disposed therein, one end of each rod being one rod is adapted to support both steps; one rod supports the associated cylinder. so that when the cylinder moves in one direction, the rod in the other cylinder moves in the opposite direction. means for coupling fluid from one actuator to another; an intermediate and restricted orifice within the coupling means; The size of the bench determines the speed of practice, which allows the speed of practice to be easily adjusted. A training device characterized by comprising: a fluid metering supply means capable of supplying a fixed amount of fluid. 2. A training device according to claim 1, wherein the actuator is a hydraulic ram. 3. The liquid cylinder is connected to each cylinder only at one end of the cylinder. 2. A training device according to claim 1, having a rod that is sealed. 4. The fluid coupling means is connected to the end of the cylinder opposite the end to which the rod is sealed. a conduit from one fitting to the fluid metering supply means; and a conduit from one of the fittings to the fluid metering supply means; and a conduit from the supply means to the other said fitting. Device. 5. 5. The training device of claim 4, wherein the conduit is flexible. 6. each of the tracks includes a cross member adjacent its base; including flexible means for attaching the end of the cylinder having the cross member to the cross member. The training device according to claim 5. 7. Claim 1: Each of said rods includes a piston seal at one end of said rod. Exercise equipment as described in . 8. Attach the top of each track so that the rod is down toward the base of the track. means for attaching to said cylinder at the end of said rod and said step from the end of each rod; 8. The training device of claim 7, further comprising means for suspending the rope. 9. means including an oil-impregnated lubricant for supporting the step within the track; 2. The exercise device of claim 1, further comprising: 10. 10. A training device according to claim 9, wherein the slip material is made of wood.