Abstract:
A rental camera is to be used by a customer for picture-taking and is intended to be returned to a lender to unload exposed film and replace with fresh film. The rental camera comprises a camera body having an exterior-to-interior through-hole; and operable means supported within the camera body for movement between a first position for deterring unloading exposed film and replacing with fresh film and a second position for not deterring unloading exposed film and replacing with fresh film, and having an engageable portion accessible via the through-hole when the operable means is in the first position for an auxiliary key to engage to move the operable means to the second position when the auxiliary key is rotated.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     Reference is made to commonly assigned copending application Serial No. 08/795,172, entitled RENTAL CAMERA WITH LOCKING DEVICE TO DETER CUSTOMER REUSE AFTER COMPLETED EXPOSURE and filed Feb. 4, 1997 in the name of Robert P. Cloutier. 
     FIELD OF THE INVENTION 
     The invention relates generally to the field of photography, and in particular to rental cameras. More specifically, the invention relates to a rental camera with a key-opening lock to deter customer reuse after completed exposure. 
     BACKGROUND OF THE INVENTION 
     It is proposed that one of the deciding factors for the success of a camera rental business is to deter the customer from removing the exposed film from a rented camera and reloading fresh film into the rented camera. This responsibility preferably should be left to the lender of the rental camera. 
     SUMMARY OF THE INVENTION 
     According to one aspect of the invention, there is provided a rental camera to be used by a customer for picture-taking and intended to be returned to a lender to unload exposed film and replace with fresh film. The rental camera comprises: 
     a camera body having an exterior-to-interior through-hole; and 
     operable means supported within the camera body for movement between a first position for deterring unloading exposed film and replacing with fresh film and a second position for not deterring unloading exposed film and replacing with fresh film, and having an engageable portion accessible via the through-hole when the operable means is in the first position for an auxiliary key to engage to move the operable means to the second position when the auxiliary key is rotated. 
     According to another aspect of the invention, there is provided a method of readying a rental camera for a lender to unload exposed film and replace with fresh film. The method comprising the steps of: 
     inserting an auxiliary key through a through-hole in the camera body and into engagement with a movable member supported within the camera body for movement between a first position for deterring unloading exposed film and replacing with fresh film and a second position for not deterring unloading exposed film and replacing with fresh film; and 
     rotating the auxiliary key in engagement with the movable member when the movable member is in the first position to move the movable member to the second position to permit the lender to unload exposed film and replace with fresh film. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an upside down rear perspective view of a rental camera which is a preferred embodiment of the invention; 
     FIGS. 2 and 3 are exploded perspective views of a film rewind mechanism of the rental camera and an auxiliary key for operating the film rewind mechanism; 
     FIGS. 4 and 5 are exploded perspective views of a film door locking mechanism of the rental camera and an auxiliary key for operating the film door locking mechanism; and 
     FIGS. 6 and 7 are exploded perspective views of a battery door locking mechanism of the rental camera and an auxiliary key for operating the battery door locking mechanism; 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention is disclosed as being embodied preferably in a still-picture camera. Because the features of a still-picture camera are generally known, the description which follows is directed in particular only to those elements forming part of or cooperating directly with the disclosed embodiment. It is to be understood, however, that other elements may take various forms known to a person of ordinary skill in the art. 
     Referring now to the drawings, FIG. 1 is an upside down rear front perspective view of a rental camera 10. The rental camera 10 is to be used by a customer for picture-taking, and then is to be returned to a lender (supplier) to unload exposed film and replace with fresh film. 
     As shown in FIGS. 1 and 6, the rental camera 10 includes a camera body 12 having a rear film door 14 that is to be opened by the lender in order to remove a 35 mm film cartridge (not shown) with exposed film from a cartridge chamber 15 and replace the cartridge with another one containing fresh film. A separate battery door 16 of the rental camera 10 is to be opened by the lender in order to remove a pair of exhausted batteries 18, 18 from a battery chamber 20 and insert a pair of fresh batteries 18, 18 into the battery chamber. The rear of the camera body 12 has a rear viewfinder opening 22 and a cartridge window 24 for viewing the film cartridge loaded in the camera body. 
     As shown in FIGS. 2 and 3, a biased-open reed switch 26 inside the camera body 12 is adapted to be closed to connect a motor 28 inside the camera body to the pair of batteries 18 in the battery chamber 20. When the pair of batteries 18 and the motor 28 are connected, the motor is powered to rewind exposed film into the film cartridge in a known manner. The exposed film must be rewound into the film cartridge before the film cartridge is removed from the cartridge chamber 15. An internal rewind-triggering slide 30 beneath an exterior housing portion 32 of the camera body 12 has a central key-hole 34 for receiving an auxiliary key 36 when the auxiliary key is inserted through a through-hole 38 in the exterior housing portion. A return spring 40 normally maintains the slide 30 in an idle position shown in FIG. 2. When the rental camera 10 is returned to the lender to unload exposed film and replace with fresh film, the lender first inserts the auxiliary key 36 through the through-hole 38 and into the key-hole 34, and locates a forward end 42 of the auxiliary key in a pivot or support hole 44 in a fixed support plate 46 beneath the key-hole. The lender then turns the auxiliary key 36 clockwise 90 degrees in FIG. 2. See FIG. 3. This moves an actuating protuberance 48 of the auxiliary key 36 into an offset portion 49 of the key-hole 34 and against an engageable straight edge 50 of the slide 30 to translate the slide to the right in FIG. 3 to an active film-rewind position against the reed switch 26, in order to close the reed switch to initiate rewind of exposed film into the film cartridge. 
     As shown in FIGS. 1, 4 and 5, an internal latching slide 52 beneath an exterior housing portion 54 of the camera body 12 has a latching hook 56 that is adapted to mate with a complementary hook 58 projecting from an inner side 60 of the film door 14, to hold the film door closed and prevent removal of the film cartridge from the cartridge chamber 15. The slide 52 has a central key-hole 62 for receiving the auxiliary key 36 when the auxiliary key is inserted through a through-hole 64 in the exterior housing portion 54 A return spring 66 normally maintains the slide 52 in a locking position shown in FIG. 4 (in which the two hooks 56 and 58 are mutually engaged). When the rental camera 10 is returned to the lender to unload exposed film and replace with fresh film, the lender first inserts the auxiliary key 36 through the through-hole 64 and into the key-hole 62, and locates the forward end 42 of the auxiliary key in a pivot or support hole 68 in a fixed support plate 70 beneath the key-hole. The lender then turns the auxiliary key 36 clockwise 135 degrees in FIG. 4. See FIG. 5. This moves the actuating protuberance 48 of the auxiliary key 36 into an offset portion 72 of the key-hole 62 and against an engageable straight edge 74 of the slide 52 to translate the slide up in FIG. 5 to an unlocking position. In the unlocking position, the hook 56 is separated from the hook 58 to permit the film door 14 to be opened to remove the film cartridge from the cartridge chamber 15. 
     As shown in FIGS. 6 and 7, the battery door 16 has a pair of coaxial pivot pins 76, 76 that are located in respective closed-end slots 78 (only one shown) in the camera body 12 and a pair of hold-down studs 80, 80 that are to be longitudinally inserted into respective open-end slots 82 (only one shown) in the camera body. To open the battery door 16, in order to remove the pair of exhausted batteries 18, 18 from the battery chamber 20 and insert a pair of fresh batteries 18, 18 into the battery chamber, the battery door must first be slid to the left in FIG. 6 to remove the studs 80 from the slots 82 and then be pivoted clockwise open in FIG. 6. A latching member 84 has a pair of curved bearing edges 86, 86 that are rotationally captured by respective curved bearing ribs 88, 88 on an inner side 90 of the battery door 16 to support the latching member for rotatable movement between a latching position and a free position. In the latching position, a latch tab 92 of the latching member 84 abuts a blocking tab 94 of the camera body 12 to prevent the battery door 16 from being slid to the left in FIG. 6 to remove the studs 80 from the slots 82. In the free position, the latching member 84 is rotated 45 degrees clockwise in FIG. 6 from its latching position to swing the latch tab 92 clear of the blocking tab 94 to permit the battery door to be slid to the left in FIG. 6 to remove the studs 80 from the slots 82. Then, the battery door 16 can be pivoted clockwise in FIG. 6 to open the battery door. An electrically conductive, resilient contact plate 96 has three holes 98, 98, 98 that contain respective support pins 100, 100, 100 on the inner side of the battery door 16 and a spring extension 102 that urges the battery door open. See FIG. 7. The contact plate 96 is located between the latching member 84 and the battery chamber 20, and bridges negative and positive ends of the respective batteries 18. The latching member 84 has a central key-hole 104 for receiving the auxiliary key 36 when the auxiliary key is inserted through a through-hole 106 in the battery door 16. When the rental camera 10 is returned to the lender to unload exposed film and replace with fresh film, the lender inserts the auxiliary key 36 through the through-hole 106 and into the key-hole 104, and locates the forward end 42 of the auxiliary key in a pivot or support hole 108 in the contact plate 96. The lender then turns the auxiliary key 36 clockwise 45 degrees in FIG. 6. This moves the actuating protuberance 48 of the auxiliary key 36 within the key-hole 104 against an engageable straight edge 110 of the latching member 84 to rotate the latching member clockwise in FIG. 6 from its latching position to its free position. 
     The invention has been described with reference to a preferred embodiment. However, it will be appreciated that variations and modifications can be effected by a person of ordinary skill in the art without departing from the scope of the invention. For example, the complementary hook 58 projecting from the inner side 60 of the rear film door 14 in FIGS. 4 and 5 can be made sufficiently resilient for the actuating protuberance 48 of the auxiliary key 36 to directly flex the complementary hook out of engagement with the latching hook 56 of the camera body 12 when the auxiliary key is turned. In this instance, the latching slide 52 would not be necessary. Similarly, in FIGS. 2 and 3, the rewind-triggering slide could be eliminated, and the auxiliary key 36 could be used to directly close the reed switch 26. 
     PARTS LIST 
     10. rental camera 
     12. camera body 
     14. rear film door 
     15. cartridge chamber 
     16. battery door 
     18. batteries 
     20. battery chamber 
     22. rear viewfinder opening 
     24. cartridge window 
     26. reed switch 
     28. motor 
     30. rewind-triggering slide 
     32. exterior housing portion 
     34. key-hole 
     36. auxiliary key 
     38. through-hole 
     40. return spring 
     42. forward end 
     44. pivot or support hole 
     46. support plate 
     48. actuating protuberance 
     49. offset portion 
     50. engageable straight edge 
     52. latching slide 
     54. exterior housing portion 
     56. latching hook 
     58. complementary hook 
     60. inner side 
     62. key-hole 
     64. through-hole 
     66. return spring 
     68. pivot or support hole 
     70. support plate 
     72. offset portion 
     74. engageable straight edge 
     76. pivot pins 
     78. closed-end slots 
     80. hold-down studs 
     82. open-end slots 
     84. latching member 
     86. bearing edges 
     88. bearing ribs 
     90. inner side 
     92. latch tab 
     94. blocking tab 
     96. contact plate 
     98. holes 
     100. support pins 
     102. spring extension 
     104. key-hole 
     106. through-hole 
     108. pivot or support hole 
     110. engageable straight edge