making at first reference to fig1 a first embodiment of the device according to the invention is shown , for the hooking and selection of weights in a physical exercising apparatus . obviously , said apparatus is not shown in any of the enclosed figures , since the device according to the invention can be provided on any apparatus . in the different figures , the corresponding parts will be indicated by the same reference numbers . in fig1 two slides are shown , for the sliding of weights , as well as a series of weights 2 to be hooked and selected . centrally , weights 2 provide a hole 3 for the insertion on the carriage pin 4 , integrally bearing the carriage 4 &# 39 ;, to which the weights must be selectively hooked in order to be lifted by the user that will act , by means not shown since not included in the present invention , just on the carriage pin 4 . within the carriage pin 4 , in the home position , at a height corresponding to each of the weights 2 , electromagnetic elements 5 are provided , in number corresponding to that of the weights 2 . each one of the electromagnetic elements 5 has a couple of metallic pins 6 , movable between two positions , respectively for the connection and the disconnection , and each weight 2 provides seats 7 for said pins 6 when they are in the connection position . by changing the polarisation of the electromagnetic elements 5 , the change of the position of the pins 6 is determined . then , it will be sufficient to send the polarisation change signal to the electromagnetic element 6 corresponding to the weight 2 to be hooked or engaged to be able to carry out the exercising with the desired charge . obviously , a computer , not shown , can manage , by the aid of position sensors , the variation of the weight 2 hooked eventually also after every stroke of the carriage 4 , and in any case according to a pre - established sequence , chosen on the basis of the specific needing of the user without the need that the latter must intervene but at the beginning . it can be provided that all of the pins 6 of the weights 2 upward the last one to be hooked and connected , in order to obtain a distribution of the charge between more pins . the solution of fig2 is very similar to the one shown and described with reference to the previous figure . the substantial difference that can be noted in this case consists in the fact that the pins 6 are provided within the seats 7 of the single weights 2 , which are physically integral with respect to them . between the pins 6 and the respective weights 2 , counter springs 8 are provided , acting on the pins 6 to maintain them within the seat 7 . the working and the principle of this embodiment substantially correspond to that already described with reference to fig1 in this case being based on the variation of the current sent to the electromagnetic elements . acting on the basis of the same principle , but with a slightly different disposition of the element , is the solution shown in fig3 . in this case , the electromagnetic elements 5 are housed within the seats 7 of each weight 2 , so that the two electromagnetic elements 5 for each weight 2 will be provided , each electromagnetic element being provided with a respective integral pin 6 . besides the opposite stroke of the pins 6 to pass from a connection position to a disconnection position , and vice versa , the working principle of the device shown in fig3 corresponds to the one of the previous embodiment of fig1 . observing now fig4 a fourth embodiment of the device according to the invention is shown , said device providing an electromechanical system , comprised of a motor 9 , two reduction gears 10 and a transmission member 11 , integral to the carriage 4 &# 39 ;. two electromagnetic elements 5 are integral to the electromechanical system , being carried by a movable support element 12 , slidable along threaded supports 13 , rotationally connected to said reduction gears 10 . the reduction gears 10 are mounted on two fixed supports 14 , provided aside the weight 2 column . within the seats 7 of each weight , pins 6 are provided , each pin having a counter spring 8 . the two electromagnetic elements 5 are positioned by the electromechanical system , and particularly by the action of the motor 9 , of the reduction gears 10 , of the threaded supports 13 and of the movable supports 12 , at the height of the weight to be hooked . afterwards , the electromagnetic elements are magnetised to bring the corresponding pins 6 in a connection position , and then to drag the weights upward the chosen weight by the carriage 4 &# 39 ;. in this case , too , a suitable computerisation allows a user , in advance , to program any sequence of work . obviously , in this as well as in the following embodiments , the electromechanical system can be replaced by an equivalent system , such as a pneumatic or hydraulic system , without departing from the scope of the invention . in fig5 it is shown a further embodiment of the device according to the invention very similar to the solution shown with reference to fig4 . in this case , instead of the electromagnetic elements , mechanical actuators 15 integral to the movable supports are provided , said actuators acting on the pins 6 provided within the seats 7 of each weight . the positioning of the mechanical actuators 15 in correspondence of the weight to be hooked causes the interference with the corresponding pins and thus the hooking of the selected weight 2 . however , in this case too the same remarks already set forth for the previous embodiments are valid . observing now fig6 a sixth embodiment of the device according to the invention is shown , said embodiment providing many of the elements already described with reference to the previous fig4 and 5 . the hooking of the selected weights 2 is in this case due to the interaction between teeth or engagement elements 16 , laterally placed with respect to each weight 2 , with the links of a toothed chain 17 , integral to the movable carriage 4 &# 39 ;, and metallic deflection elements 18 , integral with said movable supports 12 , and provided with an idle roll 19 and a transmission roll 20 . the deflection element is positioned , as in the previous cases , at the height of the weight 2 to be hooked . said deflection element 18 , by way of the idle roll 19 , bears the chain 17 link toward the tooth 16 of the chosen weight 2 , hooking or engaging the same . in this case too , by suitable devices and programs , it is possible to obtain the desired hooking sequence for the specific case and the desired function in accordance with the training or therapeutic needs of the user . in fig7 it is shown a seventh embodiment of the device according to the invention that provides two fixed columns 21 , integral with the frame of the apparatus , on both of which electromagnetic elements 5 are arranged , in number corresponding to that of the weights 2 which , at the home position , are hence facing a couple of electromagnetic elements 5 . a metallic plate 22 , having a central through hole 23 , is provided underneath each weight 2 . in particular , said hole 23 is suitably shaped so to provide two possible positions for the plate 22 with respect to the axis of the carriage pin 4 ; in a first position , e . g . with the plate 22 shifted leftwards in the drawing , the carriage pin 4 may freely run through the hole 23 ; in a second position , e . g . with the plate 22 shifted rightwards in the drawing , the carriage pin 4 is restrained in the profile of the hole 23 and drags , while running , the plate 22 and , consequently , the corresponding weight 2 . sending a suitable polarising signal to one electromagnetic element 5 of the couple , e . g . the left one , the corresponding plate 22 is shifted connection the carriage pin 4 in the profile of the corresponding hole 23 . once the plate 22 is shifted to the connection position , it is no more necessary to keep the electromagnetic field generated by the corresponding electromagnetic element 5 . for disconnecting the carriage pin 4 , it is necessary to send a polarising signal to the other electromagnetic element 5 of the couple , e . g . the right one , corresponding to the plate 22 , causing the motion of the plate 22 to the position wherein the carriage pin 4 freely runs through the hole 23 . it is also possible to send phase opposed polarising signals to both electromagnetic elements 5 of the couple corresponding to the plate 22 to make them co - operating in causing the plate 22 to shift from one position to the other . eventually , it is possible to provide that the carriage pin 4 shall be restrained also in all of the plates 22 above the weight 2 to be hooked so as to obtain a weight distribution among a plurality of plates 22 . it is evident for those skilled in the art that the electromagnetic elements 5 arranged on one or both columns 21 may be substituted by corresponding mechanical actuators rotating around the relevant column 21 . it is possible to provide a single electromagnetic element 5 per weight 2 , suitably calibrating its power , polarising them in different ways to cause the two different shifts of the plates 22 . furthermore , it is possible to provide a single electromagnetic element 5 per column 21 , eventually on only one column 21 , that are integral with an electromechanical system , similar to the one shown in fig4 integral with the frame of the apparatus instead of the carriage 4 &# 39 ;. the electromagnetic element 5 of each column 21 is arranged , through the electromechanical system , at the level of the plate 22 to be shifted to cause the carriage pin 4 to be restrained into or unrestrained from the profile of the corresponding hole 23 . the solution shown in fig8 is similar to the one shown and described with reference to the previous figure . the substantial difference in this case is the fact that the two columns 21 are integral with the carriage 4 &# 39 ;. the operation and the principle of this embodiment correspond substantially to the one already described with reference to fig7 taking into account that in the present case the polarising signal may be kept on for the whole duration of the exercising . also in this case , the variations outlined with reference to fig7 are still valid , so as to provide rotating mechanical actuators instead of the electromagnetic elements 5 on one or both columns 21 , or to provide a single column of electromagnetic elements 5 or a single electromagnetic element 5 per column , eventually on only one column , integral with an electromechanical system similar to the one in fig4 and integral with the carriage 4 &# 39 ;. in fig9 it is shown a ninth embodiment of the device according to the invention that is similar to the one described with reference to fig6 with the difference that the electromechanical system provides a single fixed support 14 and a single threaded support 13 , integral with the carriage 4 &# 39 ; and arranged , instead of sideways in respect of the column of weights 2 , inside central through holes 3 of said weights 2 . similarly , the toothed chains 17 are inserted into the holes 3 and interact with corresponding teeth 16 arranged , in the present case , inside the hole 3 of the selected weight 2 under the control of a single deflection element 18 provided with transmission means , as coupling rollers , for the links of the two chains 17 . said deflection element 18 is movable along the threaded support 13 under the control of an engine and a reduction gear , sketched by the block 24 , integral with the carriage 4 &# 39 ;. the solution in fig1 is similar to the one shown and described with reference to fig4 with the difference that the electromechanical system provides a single fixed support 14 and a single threaded support 13 , integral with the carriage ( not shown ) and arranged , instead of sideways in respect of the column of weights 2 , inside central through holes 3 of said weights 2 . a single electromagnetic element 5 , provided with two pole pieces , is integral with the electromechanical system and running along the threaded support 13 under the control of an engine and a reduction gear ( not shown ) integral with the carriage . magnetising the electromagnetic element 5 , the corresponding pins 6 are set to connection position , dragging with the carriage the weights 2 above the selected one . in fig1 it is shown an eleventh embodiment of the device according to the invention that provides that an electromagnet 25 is integrally coupled with the lower face of each weight 2 , eventually excluding the weight 2 at the bottom of the weight pack . it is evident that the electromagnets 25 may be inserted in corresponding notches in the lower face of the weights 2 . the weight 2 at the top of the weight stack is integrally coupled with the carriage pin 4 . each weight 2 , eventually excluding the one at the top of the weight stack , has at least one portion of the upper surface made of ferromagnetic material , so as to interact with the electromagnet 25 of the weight 2 just above . in particular , magnetising all the electromagnets 25 above the selected weight 2 , all the upward weights 2 , starting from the selected one , become integral with the carriage pin 4 so that the carriage pin 4 drags them along its running . in fig1 it is shown a twelfth embodiment of the device according to the invention that provides that electromagnets 25 , in number corresponding to the number of weights 2 , are integrally coupled with the carriage pin 4 at such a level that , with the carriage pin 4 at the home position , each electromagnet 25 is inside the central through hole 3 of a corresponding weight 2 . each weight 2 has at least one portion of the surface of the hole 3 made of ferromagnetic material so as to interact with the corresponding electromagnet 25 . in particular , magnetising the electromagnet 25 corresponding to the selected weight 2 , such weight 2 becomes integral with the carriage pin 4 that drags also all the other weights 2 above it along its running . eventually , it is possible to provide that also the electromagnets 25 corresponding to the weights 2 above the selected one are magnetised so as to obtain a weight distribution among a plurality of electromagnets 25 . also in the cases described with reference to the fig7 , 9 , 10 , 11 and 12 , it is possible , through suitable equipment and programs , to obtain the desired hooking sequence for the specific case and depending on the user &# 39 ; s training or therapeutic requirements . the present invention has been described for illustrative but not limitative purposes , according to its preferred embodiments , but it is to be understood that modifications and / or changes can be introduced by those skilled in the art without departing from the relevant scope as defined in the enclosed claims .
the invention concerns a device for automatically selecting and hooking weights of a physical exercising apparatus , the apparatus providing a single frame , a plurality of individual weights to be selected and engaged and a dragging element for the selected and hooked or engaged weight . the device provides at least one element for selecting and hooking the chosen weight and optionally weights upward of the chosen one . an activation system is provided to actuate at least one element for selecting and hooking the chosen weight . an electronic circuit for controlling the activation system and a system to set and control the selection and the hooking of the selected weight .