reference is now made in detail to the accompanying drawings which illustrates the best mode presently contemplated for carrying out the invention , an audio - visual device 1 , as best seen in fig1 and 2 is fitted onto an exercycle or pedaling machine 2 . the device is fixed centrally of the handle bar 3 , so that the screen 4 thereof faces toward the user &# 39 ; s eyes . the device 1 may in general be a standard motion - picture projector , a stereopticon lantern , a video recorder , a cartridge projector , or any other known apparatus for the transmission of pictures on a screen or acoustical signals , such as for example music , talking comments , rhythmical noises and the like . earphones 10 may also be associated with device 1 and coordinated with screen 4 to provide for audio sound coordinated with the material on screen 4 . in the illustrated embodiment , the audio - visual device 1 is connected to a source of current by a standard current tap 6 , which supplies the lamp of the optical system for picture projection on the screen , the listening devices of the relevant soundtracks and the picture feeding system . using switch 7 , the picture feeding device can be disconnected from the electric source or stand - by battery and connected to one of the devices to be hereinafter described . on the external periphery of the flywheel 9 of pedaling machine 2 , a crown gear is provided with a sprocket 8 meshing therewith . referring now in particular to fig3 sprocket 8 transmits , through a worm screw - helical gear coupling 40 , its rotary motion to a sheathed flexible cable 41 . this cable 41 , expousing or generally following the frame of bicycle 2 outwardly or located inwardly of the tubular element 42 , is at its end connected to a stepless speed change gear 43 . this change gear comprises two conical and opposite pulleys 14 connected by a belt 15 . it may be positioned on a fork connected to a control or drive lever 16 . the lever 16 projects from the control board 17 located on the cycle handle bar . the outlet of change gear 43 is connected to sprocket 19 drawing film 20 of a picture projector of a type similar to the normally used for moviolas . as best seen in fig4 in addition to drawing the film 20 , sprocket 19 by means of a pair of gears 21 causes rotation of prism 22 , through which ( intermittently ) light beam 23 from light source 24 projects a film image or picture passing in front of film trap 25 an underlying mirror 26 , from which it is projected onto the screen 4 , optionally , by means of additional mirror 27 . source 24 is supplied with current by means of current tap 6 or a battery , and the picture feeding is controlled by the action on pedals 28 provided by user 5 . the higher or lower feeding speed of the pictures projected onto screen 4 is thus proportional to the greater or less energy the user exerts on the pedals , and it is controlled and operated by the action of the user . the stepless speed change gear 43 is used by the user 5 to adjust the feeding rate of the projected pictures optionally with a sound track , transmitted by a standard tape recording apparatus , not shown or described because it is of known type . the changeover switch 7 may be provided by a lever pivoted at 29 and on one side connected to a mechanical gear coupling 30 and at the other end to a switch 31 . when this lever is positioned as shown in fig3 coupling 30 mechanically connects the outlet of the stepless speed change gear 43 to the drawing sprocket 19 . when changeover switch 7 is lowered , coupling 30 is disconnected and switch 31 is closed . switch 31 is inserted in the electric circuit of the projector 1 , which is thus supplied through the current tap 6 . in the first position , the picture feeding device is of the mechanical type and is directly controlled by the effort exerted by the user on pedals 28 , while in the second position this device is controlled by house current or a battery and is independent of the user &# 39 ; s action . in any case , the sound system is independent of the picture feeding control , or comprises a standard recorder . where an electrical supply is present , the picture projector can be of the sound type . a second device for controlling the picture feed of a projector , depending on the user &# 39 ; s action and not on the supply voltage , is shown in fig5 . this device is obtained by a dynamo or generator 32 , the armature of which is driven by a friction wheel 33 , frictionally actuated by the flywheel 9 of a pedaling machine . the dynamo or generator must be capable of generating a voltage of 6 - 7 volts , sufficient to operate lamp 34 . to this end , it is required that the radius of the friction wheel 33 and that of the flywheel 9 , at the contact location with the wheel , be related to each other so that the revolutions of the wheel 33 are such as to cause the dynamo or generator to generate the desired voltage . the above - mentioned lamp 34 , inserted in an optical insulator of black plastics 35 , transmits its light signals to the photoresistor 36 . by means of a known type of circuit 37 , the photoresistor 36 adjusts the speed of the projector motor 38 as a function of and proportional to the transmission speed of the light signals of lamp 34 , that is , in proportion to the speed of rotation of the dynamo or generator 32 . for illustrative purposes , the basic components of circuit 37 are shown in fig5 with the relevant characteristics of the individual components . the characteristics of circuit 37 may be varied as a function of the voltage capable of being furnished by the dynamo or generator 32 . and , in case of photoresistor characteristics , the relative arrangements as to the circuit 37 provide the most satisfactory results , both from a functional standpoint and from an economical standpoint , and because the circuit is supplied by normal household electrical source by means of current tap 6 . for voltages , different from normal household voltage and current source , a standard transformer may be inserted in the circuit according to known techniques , or the characteristics of the various components can be suitably modified . while a source of 220 volts is shown in fig5 it will be obvious that any other conventional source may be used . the projector motor 38 must be of adjustable type by triac , that is with d . c . brushes . in this second embodiment , the changeover switch 7 comprises a dual switch 39a , 39b by means of which the circuit 37 may be cut off or inserted in the supply circuit of motor 38 . also , in this case , the sound system is preferably independent of the picture drawing control , and this in order to avoid unacceptable distortions . where a source of electric supply is used , the picture projector can also be of the sound type . independent silent films , silent films coupled with sound comments provided by independent soundtracks , or films provided with proper soundtrack may be used depending on availability . owing to the possible combinations of components , a user may use the exercise machines on which the audio - visual device according to the present invention is applied in different ways , depending on what such a user desires or requires . thus , the user 5 in addition to proportioning his efforts on the pedals to perform the desired training , or the effort required by the medical treatments , may act on the pedals by constant gradual variable or programmed actions in accordance with the film , with or without soundtrack , inserted in the apparatus 1 . by this principle , it clearly appears that sound or silent films may be used with topics particularly suitable to provide a dual goal for the user . moreover , films can be used , which relate , for example , to bicycle racing , to a series of medical nature for scanning the action of patients who must undergo preventive or therapeutic exercises or to entertainment films relating to a certain action of the user of the pedals , and so on . when changeover switch 7 is inserted into the electric current supply , then the user can perform his exercises in self - governing manner . this is in order to permit the use of the exercising machine also to those who during exercise desire , for example , to be diverted by relaxing films , study a foreign language , watch a sporting event or a lecture which occurred earlier and was suitably recorded ( this in case the apparatus 1 is a video - recorder ). where the user should desire to be completely isolated from the outer environment , the apparatus 1 is provided with a suitable connection for headphones 10 , the connections of which to the transmitting apparatus used , such as recorders , video - recorders , sound projectors , are not here shown and are well known . instead of being provided with a normal screen 4 , the machine 1 could also be provided with facilities for picture projection on an external screen of larger size . from the embodiment shown in fig4 this could be obtained by a series of suitably oriented mirrors 27 . fig2 shows a second application of the audio - visual device , having the previously described characteristics , except for the type of pick up or control sensor of the independent feeding devices . in this case , the pick up or sensor may be connected to a wheel 11 of a sliding dolly or carriage 12 of rowing machine 13 and can transmit a constant electric signal to the apparatus 1 apart from the to and from reciprocating movement of the dolly or carriage 12 , owing to the application of a flywheel mounted on a free release device coaxial with the axis of said wheel 11 . with the rowing machine , the projector may also be of stereopticon lantern type , wherein the picture change is provided by a known type of button actuated by an end of stroke member located at the end of a sliding rail for wheels 11 . the films used here may be of technical - sporting nature , or may show rivers with time striking helmsmen , or be of general nature with relaxing pictures or with a plot free of the events . in addition to being used on exercycles and rowing machines , an audio - visual device according to the present invention can be also used associated with other similar gymnastic apparatus , such as for example , relaxing cots or couches with pedaling mechanism and the like . while there has been shown what is presently considered to be the preferred embodiments of the invention , various changes and modifications may be made without departing from the scope of the invention .
an audio - visual device for exercising machines including a picture projector fixed on the machine at such a position that the pictures or images can be seen by the user ; and optionally , a sound system built in the projector ; a picture feeding device , a current tap for supplying electrical energy to the projector ; the picture feeding device , and the sound system , if present ; a device for sensing the speed of the machine , applied to a moving member of the machine and transmitting the energy produced by the motion of the moving member to the picture feeding device ; wherein a changeover switch is provided for connecting , as desired , the picture feeding device either to an electrical energy source or to the device sensing the speed of the exercising machine .