Lens-fitted photographic film package

Abstract: First (5) and second (2) parts of a lens-fitted photographic film package are fastened to each other through engagement between hooks (22) and engaging portions (23) which are formed integrally in the first part and the second part, respectively. Holes (25) are formed at the root of the hooks. Each hook is formed with a projection (26) having a slope (26a) which extends from the root of the hook toward an engaging surface of the hook and is inclined in a direction to clog the space behind the hole. A stick-like tool (30) is inserted into the hole in a direction in which the first part is joined to the second part. The tool pushes the hook along the slope of the projection and bends the hook in a direction to disengage the engaging surface of the hook from the engaging portion.

Description: Background of the Invention 1. Field of the Invention The present invention relates to a lens-fitted photographic film package, and more particularly to a fixing construction for assembling the lens-fitted photographic film package, which facilitates disassembling of the lens-fitted photographic film package. 2. Related Art Lens-fitted photographic film packages (hereinafter referred to as film packages) are now on the market, for example, under a trademark "Quick Snap", which are a single-use throwaway camera pre-loaded with photographic film. The film packages (known from US-A-4 905 861, US-A-4 995 513, US-A-5 126 775, publication date 30.06.92, or US-A-5 170 199, publication date 08.12.92) make it possible to take pictures whenever desired without buying or carrying an expensive and heavy camera. The film package is substantially constructed of a front cover section 1, a main body section 2, and a rear cover section 3, as shown in Fig.7. The main body section 2 accommodates an unexposed film 4 which is previously pulled out from a film container 4a and is wound in a roll. A shutter cover member 5 for mounting a taking lens 9 is fixedly attached to the front of the main body section 2. When a shutter release button 6 is depressed, an exposure mechanism including a shutter actuating lever 7 and a shutter blade 8 is released from a charged position to expose the film 4 to light passing through the taking lens 9. When assembling the film package, the main body section 2, in which the exposure mechanism and film winding mechanism are incorporated and the unexposed film 4 and the film container 4a is accommodated, is closed by the rear cover section 3 in a light-tight fashion. The shutter cover member 5 for mounting a taking lens 9 is fixedly attached to the front of the main body section 2. Thereafter, the front cover section 1 is fixedly attached to the front of the main body section 2. These parts may be permanently secured to each other, for example, by ultrasonic welding. But recently, it is more frequent to removably fasten the parts through snap-in engagement, because this method is advantageous in view of the cost and the efficiency of the assembling. For example, a pair of hooks 10 are formed integrally in the shutter cover member 5, and a pair of engaging portions 11 are formed in the main body section 2, so that the shutter cover member 5 can be fastened to the main body section 2 by engaging the hooks 10 with the engaging portions 11, as shown in Fig.8. Similarly, as is shown in Fig.9, the front cover section 1 is fastened to the main body section 2 through engagement between hooks 16 and 17 which are formed integrally in the front cover section and the main body section 2, respectively. Engaging surfaces 10a and 11a of the hooks 10 and the engaging portions 11 are substantially perpendicular to a direction A in which the shutter cover member 5 is attached to or detached from the main body section 2. Engaging surfaces 16a and 17a of the hooks 16 and 17 are also substantially perpendicular to the direction A . A snap-in type bottom lid 3a is formed in the rear cover section. The bottom lid 3a is pried open by a photofinisher, to remove the film container 4a containing exposed photographic film therein from the film package. Meanwhile, for environmental protection and the recycling of industrial waste, the reuse of the film packages should be affirmatively promoted, although the bodies of the film packages were thrown away by photofinishers after exposed photographic films were removed therefrom for development and printing. Therefore, the manufacturer has tried to recover the bodies of the used film packages. The recovered bodies must be disassembled to sort the individual parts according to the materials. When disassembling, it is necessary to disengage the parts from one another. Conventionally, the disengagement process is carried out by hand. For instance, when the shutter cover member 5 or the front cover section 1 is removed from the main body section 2, a tool, such as a stick or screw driver, is inserted into a hole 12 or 15, and the hook 10 or 16 is bent by the tool in a direction perpendicular to the direction A , so as to remove the engaging surface 10a or 16a from the engaging surface 11a or 17a, respectively. The holes 12 and 15 are originally served as holes which allows removal of molds for forming the engaging surfaces 10a and 16a by molding. However, according to the above-described conventional fixing constructions, it is necessary to move the tool first in the direction A and then in a direction slant to the direction A , as indicated by arrows shown by chain-dotted lines in Figs. 8 and 9. This is cumbersome and reduces the efficiency of the disassembling. Furthermore, the hooks 10 and 16 were frequently broken when bent by the tool, because the hooks 10 and 16 can be bent to an unnecessarily large extent. The shutter cover member 5 with the hook 10 broken or the front cover section 1 with the hook 16 broken cannot be directly reused as a part of a new film package. Although it is desirable to automatize the disassembling process, a complicated and hence expensive mechanism would be necessary for automatically moving the tool in the above-described manner. Moreover, because the insertion amount of the tool into the holes should be limited, such an automatic disassembling mechanism requires a large accuracy in positioning and other operations. This would further increase the cost for disassembling the film packages. Summary of the Invention In view of the foregoing, an object of the present invention is to provide a film package having fixing constructions which permit to securely fasten necessary parts of the film package to one another, and to efficiently disassemble the film package, while preventing the parts from being broken. A further object of the present invention is to provide a film package having fixing constructions which permit an inexpensive automatic disassembling of the film package. To achieve the above and other objects and advantages, the present invention provide a projection on a hook. Each projection has a slope extending from the root of the hook toward an engaging surface of the hook and being inclined in a direction to clog a space behind a hole which is formed at the root of the hook. According to the present invention, the hook is bent in a direction to remove the engaging surface of the hook from an engaging surface of an engaging portion, which is engaged with the hook, by pushing the hook in a single direction along the slope of the projection. Brief Description of the Drawings Other objects and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments when read in connection with the accompanying drawings, wherein like reference numerals designates like or corresponding parts throughout the several views, and wherein: Figure 1 is a fragmentary horizontal sectional view of a film package, illustrating a fixing construction between a shutter cover member and a main body section according to an embodiment of the invention; Figure 2 is an exploded perspective view of the fixing construction of the embodiment shown in Fig.1; Figure 3 is an enlarged horizontal sectional view of the fixing construction of the embodiment shown in Fig.1, in the disengaged state; Figure 4 is a view similar to Fig.1, but illustrating a fixing construction according to another embodiment of the invention; Figure 5 is an enlarged horizontal sectional view of the fixing construction of the embodiment shown in Fig.4, in the disengaged state; Figure 6 a fragmentary horizontal sectional view of a shutter cover member having a hook according to the embodiment shown in Fig.4; Figure 7 is an exploded perspective view showing a conventional film package; Figure 8 is a fragmentary horizontal sectional view, illustrating a conventional fixing construction between a shutter cover member and a main body section of the conventional film package; and Figure 9 is a fragmentary horizontal sectional view, illustrating a conventional fixing construction between a front cover section and the main body section of the conventional film package. Detailed Description of the Preferred Embodiment While the fixing construction of the present invention may be used in any types of film packages, it will be specifically described in its application to a film package having a construction equivalent to the conventional film package illustrated in Fig.7. Therefore, the description of the corresponding parts of the preferred embodiment is omitted for brevity, and the embodiment will be described with respect to those parts which are essential to the present invention, using the same reference numerals as in Fig.7, to designate the corresponding parts. Figs. 1 to 3 show a first embodiment of the present invention. A shutter cover member 5 has a pair of hooks 22 which are formed integrally therewith and disposed on both horizontal sides thereof. A main body section 2 has a pair of engaging portions 23 formed integrally therewith. The engaging portions 23 have engaging surfaces 23a, which are brought into engagement with engaging surfaces 22a of the hooks 22 when the shutter cover member 5 is attached to the main body section 2. In Fig.1, an arrow A indicates the direction in which the shutter cover member 5 is attached to or detached from the main body section 2. The hooks 22 protrude from the shutter cover member 5 in a direction substantially parallel to the direction A , and the engaging surfaces 22a and 23a are substantially perpendicular to the direction A . Thereby, the shutter cover member 5 is prevented from moving in the direction A after the engaging surfaces 22a are in contact with the engaging surfaces 23a. The shutter cover member 5 are formed with holes 25. The holes 25 are each disposed at the root of the hook 22 in a position opposite to the engaging surface 22a. The holes 25 are primary used to remove molds for forming the engaging surfaces 22a, after the hooks 22 are formed integrally with the shutter cover member 5 by molding. The width or the horizontal length of the holes 25 is equal or more than the height of the engaging surfaces 22a, that is, the length from the foot to the top 22b of the engaging surface 22a. The hooks 22 each has a projection 26 formed integrally therewith, as shown in Fig.2. The projection 26 has a slope 26a which extends from the top 22b of the engaging surface 22a toward the hole 25. The vertical length of the projection 26 is less than the vertical length of the hook 22. Namely, the engaging surface 22a is separated by the projection 26 into two parts which are disposed on both vertical sides of the projection 26. Free ends of the hooks 22 have slopes 22c which allow the hooks 22 to get over the engaging portions 23 when the hooks 22 are pushed against the engaging portion 23 in the direction to attach the shutter cover member 5 to the main body section 2. The engaging portions 23 have a cut-out 23b each, which separates the engaging surface 23a into two parts, such that the projection 26 is fitted in the cut-out 23b. The engaging portions 23 also have slopes 23c along which the tops 22b of the engaging surfaces 22a are guided to get over the engaging portions 23. The engaging portions 23 are each disposed at an edge of a rectangular opening 27 formed in a front wall portion 2a of the main body section 2. However, it is possible to dispose the engaging portions 23 at both horizontal edges of the front wall portion 2a. When removing the shutter cover member 5 from the main body section 2, a tool is pushed into the hole 25 in the direction A , thereby to push aside the hook 22 at the slope 26a of the projection 26. As a result, the hook 22 is resiliently bent in a direction to remove the engaging surface 22a from the engaging surface 23a. The recycling of the above-described film package is effected as follows: After exposure of all the frames of the photographic film 4, the film package is forwarded to a photofinisher. At the photofinisher, the film container 4a containing the exposed film therein is removed from the package body, by prying open a snap-in type bottom lid 3a. Thereafter, the exposed film is subjected to development and printing as conventional. The developed film and finished prints are returned to the customer. The empty package body is recovered by the manufacturer. The recovered package body is subjected to a disassembling process. For example, the shutter cover member 5 is automatically detached from the main body section 2 using an apparatus having a pair of sticks 30 whose tips are rounded, as shown in Fig.3. The sticks 30 are spaced from each other by the same distance as the distance between the holes 25. The sticks 30 are movable back and forth in the direction A , relative to the package body to be disassembled. The maximum diameter of the stick 30 is slightly less than the width, that is, the horizontal length of the hole 25. Because the width of the hole 25 is equal or more than the height of the engaging surfaces 22a, the maximum diameter of the stick 30 may be equal to or more than the engaging amount by which the engaging surfaces 22a overlap with the engaging surfaces 23a. In the preferred embodiment shown in Fig.3, the maximum diameter of the stick 30 is slightly more than the engaging amount between the engaging surfaces 22a and 23a. When the sticks 30 are inserted into the holes 25, the sticks 30 contact against the slopes 26 of the projections 26. Therefore, by pushing the sticks 30 further into the holes 25, the hooks 22 are resiliently bent to leave the engaging portions 23. Thereafter, when the sticks 30 are sufficiently inserted into the holes 25 to reach a position as shown in Fig.3, then the hooks 22 are bent to such an extent that the engaging surfaces 22a just leaves the engaging surfaces 23a. Thereby, it becomes possible to remove the shutter cover member 5 from the main body section 2 at ease. In this way, the hooks 22 are prevented from being exceedingly bent. Rather, the hooks 22 are bent by the minimum amount which is necessary for removing the engaging surfaces 22a from the engaging surfaces 23a. Therefore, the breakage of the hooks 22 is prevented, even when the shutter cover member 5 is used repeatedly. Furthermore, because the direction to remove the shutter cover member 5 from the main body section 2 is identical to the direction to pull out the sticks 30 from the holes 25, and because the sticks 30 are pressed by the hooks 22 against the inner walls of the holes 25 due to the resiliency of the hooks 22, it is possible to remove the shutter cover member 5 with the sticks 30 inserted in the holes 25 by only moving the sticks 30 backwards, that is, in a direction opposite to the insertion thereof. Therefore, the automatic disassembling apparatus may be simple in construction. In addition, because it is unnecessary to position the sticks 30 in the holes 25 at a high accuracy, the automatic disassembling apparatus can be provided at a low cost. When attaching the used shutter cover member 5 to the used main body section 2 for reuse, the shutter cover member 5 is positioned in front of the main body section 2 and then pushed against the main body section 2, thereby the hooks 22 are brought into snap-in engagement with the engaging portions 23. Although the top of the projection 26 of the hook 22 is identical to the top edge 22b of the engaging surface 22a, and hence equal in height to the top edge 22b of the engaging surface 22a in the above-described embodiment, it is possible to make the top of the projection 26 higher than the top edge 22b of the engaging surface 22a. It is also possible to separate the top of the projection 26 from the top edge 22b in the direction A . According to this modification, insertion amount of the stick 30 necessary for the disengagement is reduced. Furthermore, instead of the single projection 26 disposed in the center of the engaging surface 22a, a couple of projections may be provided on both vertical sides of the engaging surface 22a. At that time, the engaging surface 23a of the engaging portion 23 should be modified correspondingly. Referring now to Figs. 4 to 6, another embodiment of the present invention will be described, wherein like or corresponding parts are designated by the same reference numerals as used in the above-described embodiment. A shutter cover member 5 has a pair of hooks 32 which are formed integrally therewith and disposed on both horizontal sides thereof. A main body section 2 has a pair of engaging portions 33 formed integrally therewith. The engaging portions 33 have engaging surfaces 33a, to which engaging surfaces 32a of the hooks 32 are fitted when the shutter cover member 5 is attached to the main body section 2. In Figs.4 and 6, an arrow A indicates the direction in which the shutter cover member 5 is attached to or detached from the main body section 2, and the engaging surfaces 32a and 33a are substantially perpendicular to the direction A . Free ends of the hooks 32 have slopes 32c for allowing the hooks 32 to get over the engaging portions 33. The shutter cover member 5 are formed with holes 35. The holes 35 are each disposed at the root of the hook 32 in a position opposite to the engaging surface 32a. Each of the hooks 32 has a projection 36 formed integrally therewith. The projections 36 have each a slope 36a extending from the hole 35 toward the engaging surface 32a in a direction to clog a space behind the hole 35. To facilitate the bending of the hooks 32, each hook 32 has a V-shaped concavity 36c in the opposite side from the slope 36a of the projection 36. A space 37 is provided between the projection 36 and the engaging surface 32a, for accommodating the engaging portion 33. That is, when the shutter cover member 5 is attached to the main body section 2, the engaging portions 33 are received in the spaces 37, while the engaging surfaces 33a of the engaging portions 33 tightly contact the engaging surfaces 32a of the hooks 32. When it is premised that La indicates a horizontal length by which the engaging surfaces 32a overlap with the engaging surfaces 33a, and Lc indicates a horizontal distance from the top 36b of the projection 36 to the top edge 32b of the engaging surface 32a, the values La and Lc are predetermined as follows: 0 ≤ Lc < La. It is to be noted that the holes 35 may be commonly used to remove a mold for forming the engaging surfaces 32a. At that time, the width or the horizontal length of the holes 35 should be approximately equal or more than the height or the horizontal length of the projection 36. When removing the shutter cover member 5 from the main body section 2, a tool is pushed into the hole 35 in the direction A , thereby to push aside the hook 32 at the slope 36a of the projection 36. As a result, the hook 32 is resiliently bent in a direction to disengage the engaging surface 32a from the engaging surface 33a. For example, a stick 40 as shown in Fig.5 is preferably served as the tool. The diameter of the stick 40 should be equal or more than the engaging amount La between the engaging surfaces 32a and 33a. By inserting the stick 40 into the hole 35 along an inner wall 35a of the hole 35 which is opposed to the hook 32, the stick 40 may be smoothly inserted without the danger of displacement. At that time, the diameter of the stick 40 should be equal or more than a length La + Lb , on the premise that Lb indicates a horizontal distance from the top 36b of the projection 36 to the edge 35a of the hole 35. When the hook 32 is bent by the stick 40 to a position where the engaging surface 32a is removed from the engaging surface 33a, it becomes possible to detach the shutter cover member 5 from the main body section 2. Because the height of the projection 36 is equal or more than the height of the engaging surface 32a, the insertion amount of the stick 40 into the hole 35 which is necessary for the disengagement of the engaging surface 32a from the engaging surface 33a can be small. The recycling process of the film package having the just described fixing mechanism may be equivalent to the first embodiment. Also an automatic disassembling apparatus having a pair of sticks, which are movable back and forth in the direction A relative to the film package, is applicable to the disassembling of the film package of the second embodiment, by determining the size of the sticks correspondingly. Although the present invention has been described in detail above with reference to preferred embodiments shown in the drawings, the present invention should not be limited to the fixing construction between the shutter cover member 5 and the main body section 2. The present invention is applicable to the fixing construction between any parts of the film package. It is, of course, possible to dispose the pair of fixing constructions in a vertical direction, wherein the size of each portions should be determined correspondingly with respect to the vertical direction, instead of the horizontal direction.

Claims: A lens-fitted photographic film package which is preloaded with film (4) and has an exposure mechanism (6-9), said lens-fitted photographic film package comprising: a hook (22, 32) having a first engaging surface (22a, 32a), said hook being formed integrally in a first part (5,1) of said lens-fitted photographic film package and extending substantially parallel to a first direction (A) in which said first part is joined to a second part (2) of said film package, and said first engaging surface extending substantially perpendicular to said first direction; a hole (25, 35), formed in said first part at a root of said hook (22, 32), opposite to said first engaging surface (22a, 23a); and an engaging portion (23, 33) formed in said second part (2), said engaging portion having a second engaging surface (23a, 33a) which engages with said first engaging surface when said first part is joined to said second part by pushing said first part to said second part in said first direction; characterised by a projection (26, 36) formed on said hook, said projection having a slope (26a, 36a) which extends from said root of said hook toward said first engaging surface to clog a space behind said hole, wherein said first engaging surface is disengageable from said second engaging surface (23a, 33a) by pushing a stick-like tool (30, 40), inserted through said hole, along said slope in said first direction (A). A lens-fitted photographic film package as recited in claim 1, wherein a free end of said hook (22, 32) is tapered off in an area (22c, 32c) opposite to said first engaging surface. A lens-fitted photographic film package as recited in claim 1, wherein said hole (25, 35) is equal to or larger than said first engaging surface in size. A lens-fitted photographic film package as recited in claim 1, wherein said projection (26, 36) is equal to or more than said first engaging surface in height. A lens-fitted photographic film package as recited in claim 4, wherein said hole (25, 35) is used to remove a mold for forming said first engaging surface integrally with said first part. A lens-fitted photographic film package as recited in claim 4, wherein said projection (26) is triangular, and abuts on said first engaging surface. A lens-fitted photographic film package as recited in claim 6, wherein said engaging portion further has a cut-out (23b) extending through said second engaging surface (23a), for accommodating said projection. A lens-fitted photographic film package as recited in claim 7, wherein said projection (26) is disposed in a center position of said first engaging surface (23). A lens-fitted photographic film package as recited in claim 8, wherein a top of said projection is aligned with a top edge (22b) of said first engaging surface (22a). A lens-fitted photographic film package as recited in claim 4, wherein said hook (32) further has a space (37) between said first engaging surface (32a) and said projection (36), for accommodating said engaging portion (33). A lens-fitted photographic film package as recited in claim 10, wherein said hook (32) further has a V-shaped concavity (36c) formed in an area opposite to said slope (36a) of said projection (36), so as to facilitate bending of said hook. A lens-fitted photographic film package as recited in claim 1 further comprising a space (37) disposed between said first engaging surface and said projection, for receiving said engaging portion therein, such that said first engaging surface is in contact with said second engaging surface.

Inventors: KAMATA KAZUO, KAMATA, KAZUO, KAMATA, KAZUO C/O FUJI PHOTO FILM CO.LTD.
Applicants: FUJI PHOTO FILM CO LTD, FUJI PHOTO FILM CO., LTD.
Application year: 1993
Main classification: G03B19
IPC codes: G03B19