Prepayment product or service dispenser
CROSS REFERENCES TO RELATED APPLICATIONS 
     Applicant thereby makes cross references to his patent application PCT/FR 85/00 333, filed Nov. 25, 1985 and claims priority thereunder following the provisions of 35 U.S.C. 119. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a prepayment product or service dispensing apparatus comprising a post anchored to the ground and including a closable compartment containing a removable coin box, and a container attachable to the post. 
     2. Description of the Prior Art 
     The dispensing apparatuses concerned by the invention are, for example: 
     dispensers of products such as photocopies, transport tickets, confectionary, newspapers, books, cigarettes or coins, and 
     dispensers of services such as telephone communications, to which reference will be made in a preferred embodiment described subsequently, or parking authorization times, or games. 
     All these apparatuses comprise mechanical and electromechanical devices, part of which are contained in the post and part of which are contained in the container, and have at least two entrances locked by key which serve as access to internal devices of the apparatus. One of these entrances is a pivoting door closing the coin box compartment which is often partitioned off from the other devices contained in the post. Another entrance is a container door or a locking device allowing a part of the container to be removed. 
     In addition, the majority of these apparatuses have a large number of projections or salient surfaces making it easier to break into the apparatus using a tool as a lever arm. In particular, a tool may be used in this way to force the door of the locked compartment, since the door is pivotable. 
     Furthermore, a person in charge of removing the coin box and maintaining the apparatus must performs several distinct and often complex operations in order to open the compartment, remove the coin box and gain access to the interior of the post and the container. These operations are often long and painstaking because of the measures taken to improve the security and the robustness of the apparatus. 
     OBJECTS OF THE INVENTION 
     The main object of the invention is to provide a dispensing apparatus doing away with the above mentioned disadvantages, in particular, offering but a single entrance for access to the coin box compartment and the internal devices of the apparatus, and only requiring a single continuous operation to extract the coin box and release the container from the post. The fact that there is only one entrance, such as the compartment door, provides effective protection of the inside of the apparatus at a lower cost. When the container and the post are robust and free of projecting points, the apparatus is practically vandal-proof. 
     SUMMARY OF THE INVENTION 
     Accordingly, a dispensing apparatus such as defined under the &#34;field of the invention&#34; is characterized in that it comprises means for concomitantly opening the compartment, extracting the coin box from the compartment and releasing the container from the post for access to internal means included in the post and the container. 
     According to features of the invention, the apparatus comprises a means for simultaneously translating the coin box and a door closing the compartment towards the outside of the post, and means controllable from the open compartment for releasing the container from the post. The translating means is pivotable when the coin box and the door are outside the post and is connected to the releasing means. Pivoting of the translating means causes release of the container in relation to the post via the releasing means. A collecter may thus in a single and continuous operation translate the coin box outwards by opening the door of the compartment and pivot the translating means to release the container from the post and, in particular, to raise the container above the post in order to remove the full coin box and repair internal devices in the post and/or container. 
     According to other features of the invention, the apparatus comprises contact means operating working mechanically in conjunction with a surface of the coin box and/or a portion of the compartment door in order to signal abnormal absence of the coin box in the compartment and/or abnormal opening of the compartment respectively. This signalling may be performed by means of a loudspeaker emitting an audible alarm signal and/or by means of a telephone transmitter transmitting an alarm signal through a telephone line to notify surveillance service, such as the police. 
     According to another feature of the invention, the security of access to the compartment is improved by a counter-door fixed against the door closing the coin box compartment. A contact means cooperating with an internal portion of the counter-door is provided to signal abnormal distancing of the counter-door in relation to the door. 
     When the dispensing apparatus is in particular a public telephone apparatus equipped with a telephone handset having a removable microphone and a removable earpiece, and with a flexible cord connecting the handset to the post, the invention provides a means of to a large extent avoiding tearing off of the handset and theft of the capsules, whilst enabling a collector to replace faulty handset capsules. For this purpose, the apparatus comprises means controllable from the inside of the compartment for separating said microphone and earpiece capsules from the handset. Preferably, the separating means comprises means sliding within the handset and disengageable from the capsules, and a traction cable, preferably sheathed, passing through the cord. The cable has a first end attached to the sliding and disengageable means and a second end accessible inside the compartment. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The other features and advantages of the present invention will be apparent from the following detailed description of several preferred embodiments of the invention with reference to the corresponding accompanying drawings in which: 
     FIG. 1 is a vertical front view of a service dispensing apparatus such as a public telephone apparatus; 
     FIG. 2 is a vertical side view of the telephone apparatus; 
     FIG. 3 is a partially cross-sectional vertical side view showing a drawer carrying a coin box, slidable and pivotable in a coin box compartment of a telephone apparatus post, as well as a device for releasing an upper container of the telephone apparatus; 
     FIG. 4 is a partially cross-sectional top view of the compartment with coin box drawer, door and counter-door; 
     FIG. 5 is a top view of the door and counter-door after break-in; 
     FIG. 6 is a schematic perspective view of a base fixed to an upper part of the post, capped by the container and supporting in particular coin chutes located within the post; 
     FIG. 7 is a longitudinal cross-sectional side view of a telephone handset including a sliding frame to join removable microphone and earpiece capsules of the handset; 
     FIG. 8 is a top view of the sliding frame in positions allowing removal and joining of the capsules; 
     FIG. 9 is a vertical cross-sectional schematic view showing means accessible from the interior of the post for pulling the sliding frame via a traction cable guided in a flexible cord connecting the handset to the post; and 
     FIG. 10 is a cross-sectional schematic view of a keyboard fixed to the inside of the apparatus container. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A preferred embodiment of a prepayment dispensing apparatus for services such as telephone communications is described hereinafter. The apparatus thus constitutes a public telephone apparatus. 
     As schematically shown in FIGS. 1 and 2, the apparatus takes the form of a vertical hollow column having a rectangular horizontal cross-section. The height of the column as well as locations of parts of apparatus members accessible to a user are determined according to ergonomic criteria. The column is made of, in a lower part, a monobloc post 1 of reinforced concrete or steel and, in a higher part, a monobloc hollow container 2, also made of a hardwearing material such as stainless steel. The post 1 is solidly anchored to the ground. The container 2 caps an upper part of the post 1 formed by a base 10. 
     In a front panel 20, the container 2 comprises different orifices and members used by the user to establish and break a telephone communication. Preferably, a telephone communication may be prepaid by means of a magnetic or electronic card and by means of coins, either of these payment modes able to be used by the user at the beginning of or at any moment during the telephone communication. In addition, the telephone apparatus may establish outgoing communications and receive incoming telephone communications. Thus the front panel 20 of the container 2 comprises a slot 21 for inserting a card, slots 22 for insertion of various coins, for example 1 FF, 2 FF, 5 FF and 10 FF coins, and a perforated surface 23 behind which is located an audio pack for &#34;free-hands&#34; use and comprising a microphone and an amplified loudspeaker. The loudspeaker enables a call tone to be broadcast to call a user. The front panel 20 of the container also has suitable orifices through which are inserted twelve keys 240 of a dialling keyboard 24 and an orifice through which is inserted a refund pushbutton 25. Pressing in pushbutton 25 triggers breakage of telephone communication, and ejection of a card through slot 21 or refunding of coins in a refund dish 11 accessible on a front panel 12 of the post 1. On the upper part, container 2 has a downwards sloping top panel 26, from and a rear panel 27 to front panel 20, forming a console with front surround 260. 
     The container 2 completely covers a chassis 28 attached to the top of base 10. The chassis is typically formed of iron uprights and cross-members, as schematically shown in FIG. 3. Chassis 28 supports various mechanical and electromechanical means housed in the container and generally designed for establishing and breaking a telephone communication, such as the audio pack with loudspeaker and microphone already mentioned, electromechanical card reading means, and electromechanical coin sorting and testing means as well as storage pending collection or refund. A case, described later on with reference to FIG. 10, contains electromechaniccal means, such as keys and contacts, of the dialling keyboard 24 and the refund button 25, and is attached to container 2. 
     As schematically shown in FIGS. 1 and 2 and in more detail in FIG. 3, post 1 comprises a compartment 3 containing a removable coin box 4 and opened by a door and lock mechanism 5 in the front wall 12 of the post, a locking device 6 for joining the container 2 onto the post 1 and separating the container from post 1, a telephone handset 7 with trigger 70 and a release mechanism 8 for separating a removable microphone capsule 71m and removable earpiece capsule 71e from handset 7. On the side of post 1, a hook 72 is provided for the handset 7. When the trigger 70 is pressed, the microphone and the loudspeaker located behind the perfored surface 23 are disconnected from the telephone line serving the telephone apparatus, and microphone 71m and earpiece 71e of the handset are connected to the telephone line. 
     With reference to FIGS. 3 and 4, the coin box compartment 3 comprises a sheet metal chassis 30 into which slides a drawer 31 receiving the coin box 5 and equipped with door and lock mechanism 5. 
     The chassis 30 is generally of a hollow parallelepipedic shape, open to the top and front and located between an internal face 130 of a rear wall 13 of post 1 and a rectangular opening 120 made in the front wall 12. A vertical rear side 301 of the chassis is attached to the wall 13 by means of studs 302 one end of each of which is split and buried in the post and the other is threaded and receives a locking nut. A front end of a bottom 303 of chassis 30 rests on a horizontal side of opening 120. 
     The chassis 30 is equipped with two hollow pivoting arms 304 which extend horizontally when the drawer 31 is not pulled fully forwards as will be seen hereinafter. Back ends of arms 304 are articulated around horizontal pivots 305, parallel to walls 12 and 13 and fixed to upper rear ends of longitudinal vertical sides of the chassis 30. In the arms 304 are slidably mounted two parallel arms 310 of drawer 31 extending rearwards. Arms 304 have vertical U-shaped cross-sections with facing flanges. Longitudinal sides of arms 304 forms webbings of the U-sections and have horizontal slits forming slides, extending above horizontal ribs 306 of chassis 30. Free rollers 311 with horizontal rotation axles are mounted at the rear of the arms 310 of the drawer and are designed to roll in the horizontal slits 3040 and on the ribs 306 when the arms 310 slide in arms 304 in the horizontal position. In addition, two helicoil spings 307 having front ends joined to stop washers 308 and rear ends hooked onto pivots 305 slide coaxially at the rear of pivoting arms 304. 
     The front of sliding arms 310 project from a coin box receptacle 312 in drawer 31. Receptacle 312 has also a parallelepipedic form similar to coin box 4 and comprises two horizontal struts 313 on which two lateral shoulders 40 of the coin box 4 rest. As shown in FIGS. 3 and 4, the coin box 4 has two lateral handles 41 for lifting the coin box up of the receptacle 313 when the drawer is drawn to the exterior. 
     The door and lock mechanism 5 is attached to a vertical front wall 314 of the drawer 31, forming a shielded door to compartment 3. A lock 50 of a known type is fixed through the shielded door 314 with, along the inside of its rear side, two pairs of vertically sliding and opposed lockbolts 51 cooperating with two clasps 52 attached to an internal side 121 of the front wall 12 of the post and located above and below the opening 120. 
     The mechanism 5 also comprises means for triggering an alarm before any attempt to break into the shielded door 314 and the lock 50. The alarm triggering means comprises a hollow counter-door 53 consisting of a stamped metal plate. The counter-door 53 is attached to the shielded door 314 by means of distortable metal fasteners 54 contained inside the counter-door, as shown in FIG. 4. The metal fasteners 54 are strips folded into a concertina shape and each having 540 fixed to a front inside vertical face 530 of the counter-door by means of a threaded rod welded to side 530 and taking a nut, and a rear end 514 riveted or welded to the shielded door 314, in order to prevent the fasteners being disassembled from the exterior. 
     In normal condition, the fasteners 54 flatten the counter-door 53 parallel against door 314, as shown in FIG. 4. A electric contact 55 housed in an upper side of the opening 120 cooperates with a horizontal tab 56 attached to the counter-door 53. When the drawer 31 is inside compartment 3 and an outside side 531 of the counter-door 53 is coplanar with an outside side 122 of the front wall 12 of the post with the bolts 51 being engaged in clasps 52, the contact 55 is kept closed on tab 56. 
     If an ill-intentioned person attempts to gain access to the lock 50 and the door 314, he must first pull forwards the counter-door 53 and thus stretch the fasteners 54, as shown in FIG. 5. The counter-door 53 is thus separated from the shielded door 314 and the tab 56 is moved away from the contact 55 which then switches to open and triggers alarm transmission. Opening of contact 55 controls an alarm device housed in the post 1, and/or triggers transmission of a special signal to a local telephone central office serving the telephone apparatus via the alarm telephone transmitting means and the telephone line. The alarm is broadcast in the form of a strident audible signal through the already mentioned loudspeaker, and/or the local central office alerts surveillance services, such as police. Thus, well before actual forcing of the coin box drawer 31, the alarm is given. The counter-door 53 can be economically returned to its normal position against door 314 simply by restoring the fasteners 54 to their original shape. 
     In addition, it is noted that the counter-door 53 protects the lock 50 against insertion bodies, and that fracture of the lock would require a long tool in order to pass through the key insertion hole 532 in the counter-door 53. 
     With reference to FIG. 3, the coin box compartment 3 is opened in two steps for removal of the coin box 14 and a third subsequent step for access to the inside of the post 1 and container 2. 
     At the beginning of the first step, a coin box collector inserts a key through hole 532. The key penetrates lock 50 and is turned to release from the clasps 52 the bolts 51 which come together vertically. The springs 307, at first compressed, expand to push stops 308 forwards a distance of a few centimeters L 1 , the rear ends of arms 310 sliding in horizontal arms 304. After relaxation of springs 307, the front 53-314 of the drawer 31 projects from the front wall 12 of the post and enables the collector to grasp the drawer and pull it to the exterior. 
     It is to be noted that the presence of springs 307 allows a check to be made to ensure that the compartment 3 is correctly closed by verifying that the front 53-314 of the drawer is flush with the side 122. If the drawer is not locked with lock 50, the springs 307 will push the drawer out, and the tab 56 will be clear of the opening 120 and there will therefore be no closure of the door contact 55. 
     At a second step, the drawer 31 is pulled out a distance L 2  until the coin box 4 is in front of side 122 and can be removed from the receptacle 312 using the handles 41. A second electric contact 57 attached to the inside side 121 of the front wall 12 of the post is closed when pressed by the top 42 of the coin box 4 inside the receptacle 312 with the drawer closed. The contact 57 is thus opened at this second step, and signals coin box removal. Similarly, closure of compartment 3 by pushing and locking drawer 31 but without it containing a coin box, also keeps contact 57 open. Contact 57 open thus signals that the coin box is missing from compartment 3, and contact 57 open with contact 55 closed signals that the coin box is missing after the compartment has been closed. Contacts 55 and 57 are connected in series, and consequently, opening of contact 57 also triggers broadcasting of the audible alarm and/or transmission of an alarm signal to the local central office. In particular, removal of a full coin box by the collector not followed by insertion of an empty coin box into receptacle 312 and closure of the compartment by pushing and locking the drawer is signalled. In other embodiments, electric contacts 55 and 57 may be replaced by photoelectric cells or magnetic contacts. 
     It will be noted that the telephone apparatus comprises a first &#34;passive&#34; electronic equipment housed inside post 1 which allows the power supply to be cut off from the electromechanical card reading and coin sorting and testing means as soon as the compartment is opened, in order to make it impossible to establish a telephone communication. In addition, the local central office is linked to a second &#34;active&#34; electronic equipment which controls broadcasting of the alarm through the loudspeaker and transmission of the alarm to surveillance services only outside perdetermined coin box removal periods. These two electronic equipments will not be described and do not enter in the scope of the invention. 
     During the second step corresponding to pulling out of drawer 31, the rams 310 slide forwards in pivoting arms 304 which are held horizontal by the rollers 311 rolling and resting on horizontal ribs 306 of chassis 30. After removal of coin box 4, when rollers 311 are forwards of the front edges 3060 of the ribs 306 and only rest on the slits 3040, the drawer 31 may then be lowered by an angle α 3  of about 20°, by pivoting arms 304 about horizontal pivots 305. This third step allows the container 2 to be released from the post 1 and access to be gained to the inside of the post 1, by means of the locking device 6 described below and located in post 1, between the base 10 and the chassis 30 of the compartment. 
     As schematically shown in FIG. 6, the base 10 has the shape of a parallelepipedic block mounted on the upper edges of the walls of post 1 and closing it off. Subtantially at the center of base 10 and parallel to walls 12 and 13 of the post are provided three adjacent narrow rectangular slots 101 1 , 101 2  and 101 3  into which are inserted a coin refund chute 102 1 , a coin collection chute 102 2  and a printed circuit board rack 102 3  respectively. The tops of chutes 102 1  and 102 2  and rack 102 3  are attached to the base 10 or rest on the base, and the rest projects vertically beneath base 10 and above chassis 30. The chutes and the rack are made of sheet metal or plastic. Regions of the chutes subjected to impacts and frictions from the coins are preferably reinforced with metal plates. 
     Chutes 102 1  and 102 2  are located beneath electromechanical switching means located at the level of the coin storage zones and included in the coin sorting and testing means attached to chassis 28 in container 2. A lower end of chute 102 1  converges towards the bottom in the direction of the refund dish 11. A lower end of chute 102 2  converges towards the bottom above a coin reception slot in coin box 4, when the latter is inside the compartment 3 with the drawer 31 locked. As can be seen in FIG. 6, the collection chute 102 2  abuts vertically against a duct 103 containing electrical cables. The cables notably connect contacts 55 and 57, the telephone line, the microphone and earpiece of handset 7 and photoelectric or magnetic coin passage detectors 104 1 , 104 2  and 104 3  to the electronic circuits on the printed circuit boards housed in rack 102 3 . Rack 102 3  in particular contains the electronic circuits concerning the audio circuit of the telephone apparatus, the card reading means, the coin sorting and testing means, the dialling keyboard 24 and the passive equipment already mentioned. 
     The three detectors 104 1 , 104 2  and 104 3  are located at three different levels along the lower vertical end 105 of chute 102 2  placed above the coin box and only allowing collection of one coin at a time. The detectors take part in the validation of coin collection so that this can be signalled to the active equipment associated with the local central office via the telephone line. Passage of a coin along a route other than normal descent through the switching device and coin box, for example following fraudulent extraction of a coin from the coin box, is also detected. 
     Base 10 also comprises two lateral recesses 106, designed to receive complementary portions, such as feet, of container 2 so that it can be easily grasped when released from the post, as will be seen hereinafter. Between the recesses 106 and the ends of the slots 101 1 , 10 2  and 101 3  there are two small lateral crossing mortises designed to receive the greater part of locking device 6. 
     As shown in FIG. 3, the locking device 6 comprises two vertical linkrods 60 having lower ends 61 hinged on pivoting arms 304, and upper ends 62, in the shape of an angle bracket, sliding in the mortises 107 of base 10. In each mortise 107, the locking device 6 comprises two levers 63 each having two arms 630 and 631 on either side of an elbow 632 with an angle of about 120°, are rotatably mounted around a horizontal axle in the mortise 107. A free end of the first arm 630 of each lever 63 connects with the upper end 62 of the linkrod 60 and has a roller 633 sliding in an oblong horizontal slit in the bracket-shaped end 62, extending parallel to walls 12 and 13. A free end of the second arm 631 of each lever 63 slots into a small horizontal groove 290 beneath a lower part of the container 2, forming a tenon 29, sliding in the respective mortise 107 of base 10 and complementary to the mortise. 
     As shown by heavy lines in FIG. 3, when the pivoting arms 304 of chassis 30 of the coin box compartment 3 are horizontal, the upper end 62 of the linkrod 60 is in a raised position and is substantially flush with the upper horizontal surface of the base 10. The first arms 630 of the two levers 63 in each slit 620 form an angle of about 60° with an apex pointing upwards, and the second arms 631 are horizontal and hold the tenons 29 in the mortises 107 so that the lower part of the container 2 surrounds the base 10 and so that container 2 is locked onto post 1. 
     At the beginning of the third step defined above, the drawer 31 is pulled forwards so that the rollers 311 are no longer supported by the ribs 306 of chassis 30 and abut against the forward ends of the slots 3040 of arms 304. The drawer 31 is then pivoted downwards around the pivots 305, for example the collector may use his foot, until the lower surface of the coin box receptacle 312 stops against the front lower end of chassis 3 in opening 120, as shown by mixed lines in FIG. 3. The drawer 31 has thus pivoted by angle α 3 . The pivoting of the arms 304 pulls the linkrod 60 vertically downwards, as shown by the mixed lines in FIG. 3. During pivoting of the drawer, the levers 63 in each mortise 107 turn in opposite directions by an angle of about 60° following the pulling downwards of the rollers 633 by the upper end 62 of the linkrod 60. Simultaneously, the second arms 631 turn upwards and approach the vertical in order to raise container 2 by pushing against the tenons 29 and disengaging the free ends of arms 631 from the grooves 290, which releases the container 2 from the post 1. At the end of the third step, the lower part of the container 2 is substantially touching the base 10. Container 2 may then be removed from chassis 28 so that access is gained to the devices on chassis 28 and the collector can pass his hand through opening 120 in the post to access a pull-ring in device 8 for releasing the microphone and earpiece capsules in handset 7. 
     As shown in FIGS. 7 and 8, ends of the handset 7 comprise two tapped bosses 73m and 73e into which the microphone capsule 71m and the earpiece capsule 71e are screwed respectively. Beneath threaded sections of cylindrical portions of capsules 71e and 71m are provided annular grooves 74e and 74m which are located beneath the bosses 73m and 73e and inside an internal cavity 75 of the handset 7, when the capsules are fully screwed into the bosses. 
     The grooves 74e and 74m on the capsules work together with a flat rectangular blocking frame 80 of the device 8 which is slidably mounted between guides 76 preformed in the cavity 75 and perpendicular to the axes of the capsules and bosses. In a position blocking capsules 71m and 71e, small flat sides 81m and 81e of frames 80, forming bolts, are engaged in the grooves 74m and 74e respectively, by means of two helicoil springs 82 vertically surrounding thin longitudinal sides of frame 8, sliding in guides 76. One, 820, of the ends of each spring 82 is anchored to the cavity 75 of the handset on the 73m boss side, and the other end, 821, of each spring 82 is attached to the frame 8 on the 73e boss side, which pushes frame 8 from boss 73m towards boss 73e. 
     In the end of handset 7, on the 73m microphone boss side, a strong flexible metal cord 77 penetrates, and protects six conductor wires 770 which connect the microphone, the earpiece and a relay contact controlled by trigger 70 to the telephone apparatus audio circuit. An end of the cord 77 is attached to the handset by a stop ring 780 joined to a branch of a U-shaped yoke fixed in cavity 75, under boss 73m. Another branch of the yoke 78 is fitted with a stop ring 781 pinching a sheath 830 of a traction cable 83, this cable having an end 831 attached to bolt 81m. Cable 83 is positioned at the centre of cord 77 and is surrounded by conductor wires 770. The traction cable 83 helps to strenghten the telephone cord 77, the better to withstand attempts to rip out the handset 7. 
     As shown in FIG. 9, a second end of the protection cord 77 passes through a bushing 140 attached to a vertical side wall 14 of post 1, by means of an external collar 141 and an internal nut 142 passing through wall 14. The second end of the cord 77 is attached to the inside of post 1 by means of a stop ring 143 joined to bushing 140. The nut 142 also enables a U-yoke 144 to be flattened against the internal side 145 of wall 14. Yoke 144 has two horizontal branches 146 and 147 having upwards vertically folded ends. The vertical end of branch 146 supports a stop ring 148 for a second end of sheath 830 of the traction cable 83 which leads from stop ring 143 jointly with the conductor wires 770 penetrating the vertical duct 143 just beneath the base 10. The second end 832 of the traction cable 83 leading from ring 148 is fixed to a pull-ring 833. 
     When a repairer wishes to replace one or other of the handset capsules 71m and 71e, the coin box compartment 3 is opened, as previously described, by pulling out the drawer, so that the repairer can insert his hand between the wall 12 of post 1 and the shielded door 14, beneath the drawer 31 and through the opening 120 (FIG. 3), and thus grasp pull-ring 833. The ring 833 is pulled to exert traction on cable 83 which slides in the sheath 830, over a length L 4  greater than the depth of the annular grooves 74m and 74e, as shown in FIGS. 7 and 8. Frame 80 slides on the guides 76 from boss 73e towards boss 74m so as to free bolts 81m and 81e from grooves 74m and 74e respectively, as shown in mixed lines in FIG. 8. The traction exerted on cable 83 against the return force of the springs 82 is maintained by hooking the ring 833 over the second branch 147 of yoke 144, which forms a hook. In this case, capsules 71m and 71e may be unscrewed from bosses 73m and 73e to the handset by unhooking ring 833 from hook 147, bolts 81m and 81e will engage in grooves 74m and 74e on the new capsules by the relaxation of the springs. 
     However, it should be noted that unhooking ring 833 from the hook after removal of capsules 71m and 71e does not prevent new capsules from being screwed in. Indeed, capsules 71m and 71e have conical pointed lower ends 78m and 78e immediately below grooves 74m and 74e. When the capsules are screwed in, pointed ends 78e and 78m gradually push aside bolts 81m and 81e, in a similar manner to the traction on cable 83, until grooves 74m and 74e are at the same level as the frame 80. In any case, because of the force exerted by springs 82 engaging bolts 81m and 81e in grooves 74m and 74e, it is impossible to remove capsules 71m and 71e from the handset 7. 
     As already stated, only the dialling keyboard mechanism 24 is attached to front panel 20, inside the container. The refund and end-of-communication pushbutton 25 and the contacts it controls are laid out in the same way as the key and contacts of the keyboard mechanism 24. With reference to FIG. 10, the keyboard mechanism is enclosed in a protective case 241 fixed against the wall 20 by means of a perforated backing plate 242, forming a grille, by means of bolts 243 which can not be seen from the outside. Grille 242 forms an integral part of container 2 and may be welded to the inside of it. Each key 240 has a T-shaped horizontal cross-section whose branches make a prismatic block which recesses into a hole 245 made in the wall 20 of the container, and whose leg 246 slides through a hole 247 in the backing plate 242. Extraction of the keys 240 from the outside is prevented by means of pins 248 which pass through the legs 246 of the keys and slide along slots made in recesses 249 in the case 241. The recesses 249 each contain a conventional key return spring and respective contacts. The refund bottom 25 is similar to keys 240 and is also protected against being torn off by a pin mounting assembly. 
     Although the invention has been described as based on a public telephone apparatus, the majority of the essential devices and mechanisms belonging to the object of the invention, such as the translatable and pivoting drawer 31, the door and lock mechanism 5 of the coin box compartment 3 and the device 6 for locking container 2 on post 1, may be adapted to any prepayment product or service dispenser. When the dispensing apparatus comprises a keyboard, this may be as described with reference to FIG. 10.