EP0177643A1 - Device with precise, silent and quick latching for selecting and damping dynamic efforts, especially designed for muscle strengthening and reeducation apparatuses - Google Patents

Abstract

Weights or loads which can be varied in terms of quantity, positions and directions are locked on a shaft with peripheral grooves, with precision, and guarantee silent operation by virtue of the device which combines the shape of the grooves, pin-clips, possible axial dampers of selectors and slides, and of weights. The great ease and safety of use of the weights as well as of the adjustment of the application of the loads in general is obtained either in translation or in rotation by the precision of the latching and modular damping. All this minimises unwanted vibrations due to stresses which cannot be evaluated, especially on the machined bearing surfaces. A further advantage lies in the lower machining costs and thus in the standardisation of modules of superior quality and improved durability. <IMAGE>

Description

The invention is explained using a few drawings representing a non-exhaustive embodiment.

The invention relates to a device bringing into play a key or pin which can be secured to a translational axis grooved in turn, which makes it possible to load, upon request, counterweights subjected to alternating displacements with damping of the frequency lines induced during changes of direction. , this by damping and the slide, and weights, and the selector.

For bodybuilding machines in particular, 1-1 dots are used which penetrate into a cylindrical groove ^1.2 of a sliding weight, then into a radial bore of axis known as a hole selector, in order to easily select the number of elements to be lifted . Figure 1

• - Des claquements caractéristiques lorsque la série de poids passe par le point bas pour l'aiguillot et pour les disques.
• - Un éventuel déverrouillage de l'aiguillot.
• - Une augmentation rapide de frottements dus aux déséquilibres des efforts sur les coulisseaux latéraux de guidage, et en règle générale une usure rapide des parties en mouvement y compris du logement de l'aiguillot, phénomène qui tend toujours à s'aggraver.

The machining of this groove, as well as of the elementary weight surfaces and of the hole, lead to tolerances which, cumulatively, necessarily lead to an overhang and a locking game which result in:

• - Characteristic clicks when the series of weights passes through the low point for the spur and for the discs.
• - A possible unlocking of the spur.
• - A rapid increase in friction due to the imbalances of the forces on the lateral guide slides, and as a rule rapid wear of the moving parts including the housing of the spur, phenomenon which always tends to worsen.

• - Une tige sélecteur à rainures 2-1 périphériques au lieu de radiales, et intégrant ou non un ressort amortisseur.
• - Une épingle rendant à la demande la tige sélecteur solidaire du poids choisi. 2-3
• - Un poids coulissant 2-4 dont la face inférieure au moins comporte des coussins amortisseurs 2-6 dans la gamme de fréquence appropriée. Figure 2

The present invention overcomes these drawbacks, and operates under analogous conditions with:

• - A selector rod with 2-1 peripheral grooves instead of radial, and whether or not incorporating a damping spring.
• - A pin making the selector rod secured to the chosen weight on request. 2-3
• - A sliding weight 2-4 of which the lower face at least has shock-absorbing cushions 2-6 in the appropriate frequency range. Figure 2

The selector generally carries a 2-6 neoprene ring plus a spring at the top and a ring at the bottom, 2-7 allowing a drop of weight in downward translation with energy absorption stored by the only selector, therefore of low inertia. next to the mobile assembly, also amortized on the suspended slides and the bearings. Figure 3

The height of travel allowed on the groove can be a function of the load. Plus the height play in the groove, facilitates the positioning of the pin, when the spring at the top of the selector rod is compressed.

• -Le silence de fonctionnement.
• -L'usure moindre des pièces en mouvement, garantissant une plus grande durabilité et fiabilité.
• -Un prix de revient des usinages très abaissé pour les contrepoids, puisque les absorbeurs autorisent des tolérances élevées sur les portées planes, et pour le sélecteur qui est travaillé au tour automatique sans perçage radiaux multiples.

The advantages obtained thanks to this invention are:

• -The operating silence.
• -Lower wear of moving parts, guaranteeing greater durability and reliability.
• -A cost of machining very lower for counterweights, since the absorbers allow high tolerances on the flat surfaces, and for the selector which is worked on the automatic lathe without multiple radial drilling.

FIG. 3 shows the extreme case of a very loaded assembly with here two pins locked in order to possibly better guarantee the shearing force.

Figure 4 shows the selector rod with its long travel grooves in the high load position.

• Figure 5 rainure droite simple.
• Figure 6 rainure en tore
• Figure 7 rainure avec 1/4 de tore, puis cylindre, puis 1/4 de tore avec absorption par les amortisseurs ressorts d'extrémité, le débattement peut être réglé sur sélecteur pour pleine charge et pleine chute.
• Figure 8 rainure avec au plus haut une butée conique puis torique en butée basse. C'est la forme qui couplée aux amortisseurs, donne les meilleurs résultats de verrouillage silencieux. Δy varie avec la charge en décroissant quand y croit vers le haut tandisque les intervalles Y_n-1-Y_n restent constants si les coussinets ont une épaisseur constante.
• Figures 9-10-11 L'épingle ou aiguillot peut revêtir différentes formes et est constituée de matières diverses à associer avec les coussinets.
• Figure 9 Fil rond d'inox. Peut-être le poids ou bague ou disque. Figure 10 Ditto avec barette de sûreté. Figure 11 Coussins à disques plats sur les axes latéraux qui bloquent le débattement latéral de l'épingle. Les coussins peuvent avoir une densité croissante avec la charge verticale, les plus simples sont en néoprène de modules variables et épaisseur constante afin de garder les mêmes intervalles, ou en matière plastique telle que polyétylène et rilsan...
• Figure 12 Une épingle acier extra plate couplée à des coussins parallélipédiques ou cylindriques, portant un passage pour butée latérale.

Figures 5, 6, 7, 8 show different types of grooves allowing different absorption rates of the frequency lines.

• Figure 5 simple straight groove.
• Figure 6 torus groove
• Figure 7 groove with 1/4 torus, then cylinder, then 1/4 torus with absorption by the end spring dampers, the travel can be adjusted on the selector for full load and full fall.
• Figure 8 groove with a conical abutment at the top then an O-stop at the bottom abutment. It is the shape which, coupled with the shock absorbers, gives the best silent locking results. Δy varies with the load decreasing when y increases upwards while the intervals Y _n-1 -Y _n remain constant if the bearings have a constant thickness.
• Figures 9-10-11 The pin or spur can take different forms and is made up of various materials to be associated with the pads.
• Figure 9 Round stainless steel wire. Maybe the weight or ring or disc. Figure 10 Ditto with safety bar. Figure 11 Cushions with flat discs on the lateral axes which block the lateral movement of the pin. The cushions can have an increasing density with the vertical load, the simplest are in neoprene of variable modules and constant thickness in order to keep the same intervals, or in plastic material such as polyethylene and rilsan ...
• Figure 12 An extra flat steel pin coupled to parallel or cylindrical cushions, carrying a passage for lateral stop.

Again the rilsan, polyethylene or other cushions are much more easily machinable.

Their thicknesses, therefore the notch intervals can vary on demand by increasing when the load increases, this being regulated by an installation manual. Figure 13.

Figure 2 The upper and lower parts of the selector show that its oscillations are damped by a spring 2. and a silent block ring at the top, and a ring at the bottom. The assembly tending to lock the pin at the bottom of the groove, and the spring facilitating the positioning of the pin. 2-3

Note that the shock-absorbing suspension of the guide slides is similar to that of the selector rod, but with insulation by plastic tube and spring-shock absorber at the highest point of suspension relative to the frame and plastic tube for lateral travel compensation. Figure 2.

Figure 1 shows a variant with keying of a mass M, of a sleeve with perpendicular axes, and of an end sleeve for anchoring the strand. In this case, the torque due to the mass M can be adjusted linearly on demand, as well as the amplitude of the movement adjusted over the distance R1 as well as on a pulley ratio. The response to the effort is then of the parabolic type, ie increasing with the square of the amplitudes.

This remains true when at point M a pulley return brings back to the system already described vertical loads. The principle of rapid joining by pin on grooves remains applied.

Claims (5)

Dynamic load or range of motion selector device, with precise, silent and fast locking. Dynamic effort selector and shock absorber device with precise, silent and fast locking, mainly intended for bodybuilding and rehabilitation equipment. 1- The device comprises at least one axis with peripheral grooves of suitable shape, at least one pin or locking key fastening at the request of the loads set in movement of linear or circular translation or other. 2- Or joining on a selector rod, an axis of rotation, an anchor for adjusting range of motion, etc. 3- This precise locking is generally associated with an axial damping of the selector's fall and of the loads on the sliders themselves suspended. All this contributing to silent and safe operation.

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