JP3859341B2 - Flange for hollow member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flange for a hollow member, and more particularly to a flange for a hollow member that is attached to an end portion of a paper tube of a mandrel obtained by winding a long photographic paper or a photosensitive film in a roll shape.
[0002]
[Prior art]
A strip-shaped long photosensitive material such as photographic paper or photosensitive film is wound around a hollow mandrel made of a paper tube or the like in a roll shape, and is packaged, transported, or mounted on an apparatus. In order to protect, shield, and handle the roll-shaped photosensitive material, disk-shaped flanges are attached to both ends of the hollow paper tube of the roll-shaped photosensitive material.
[0003]
As a method of attaching the flange, conventionally, methods such as Japanese Utility Model Laid-Open No. 1-38582, Japanese Utility Model Publication No. 6-31465, and Japanese Patent Application Laid-Open No. 9-211800 have been proposed. Japanese Utility Model Laid-Open No. 1-38582 uses an adhesive to connect a flange to a hollow mandrel. In Japanese Utility Model Publication No. 6-31465, an insertion member to be inserted into the hollow portion of the mandrel is provided at the center of the flange, and a projection is provided on the outer periphery of the insertion member, and the flange is coupled to the hollow mandrel by this projection. In JP-A-9-21800, flanges at both ends are connected and fixed through a screw shaft in the axial direction in the hollow portion of the mandrel.
[0004]
[Problems to be solved by the invention]
By the way, such a flange is usually made of plastic. After the roll-shaped photosensitive material is used, the paper tube to which the flange is connected is discarded, but the plastic flange must be removed from the paper tube and disposed of separately.
[0005]
In the case of the above-mentioned Japanese Utility Model Laid-Open No. 1-38582, since both are bonded, separation is not easy. In the case of Japanese Utility Model No. 6-31465, the protrusion bites into the paper tube and separation is not easy. In the case of Japanese Patent Laid-Open No. 9-211800, a tool for removing the screw shaft must be used.
[0006]
As described above, the conventional method focuses on securely connecting the paper tube and the flange to each other, and does not take much consideration on the ease of removal or disposal, and lacks the convenience for general users. It was a thing.
[0007]
The present invention has been made in view of such problems of the prior art, and the object thereof is to provide a hollow member such as a paper tube and a flange attached to the end of the roll photosensitive material after use of the photosensitive material. It is an object to provide a flange for a hollow member that can be easily separated.
[0008]
[Means for Solving the Problems]
The flange for a hollow member of the present invention that achieves the above object is a flange for a hollow member that is detachably attached to an end portion of a pipe-like hollow member, the disc having a concentric hole in the center, and the circle Two flexible pieces extending from a hollow cylindrical insertion member extending from the hole of the plate directly or from the hole along the central axis in a cantilever manner symmetrically with respect to the central axis and extending along the central axis, Are provided with a mechanism for expanding or releasing the extension between the two bending pieces, and are all integrally formed from plastic, and each of the bending pieces is expanded in a state where the bending piece ends are expanded. A projection provided on the outer end of the tip is engaged with the inner surface of the end of the hollow member, the flange for the hollow member is attached to the end of the hollow member, and the extension for the end of the flexure piece is released and the flange for the hollow member is released. End of hollow member It is characterized in that the removable.
[0013]
Such a flange for a hollow member may be detachably attached to the end of a paper tube of a mandrel of a rolled photosensitive material around which a long photosensitive material is wound, or may be detachably attached to an end of a metal pipe. it can.
[0014]
In the present invention, there is provided a mechanism for expanding or releasing the extension between the two bending pieces between the two bending pieces, and the protrusions provided on the outer ends of the bending pieces in a state where the bending pieces are extended. The flange for hollow member is attached to the end of the hollow member by engaging with the inner surface of the end of the hollow member, and the flange for the hollow member is made removable from the end of the hollow member in a state where the expansion between the distal ends of the bending pieces is released. Therefore, the flange and the hollow member can be separated by a simple one-touch operation. After using the roll-shaped photosensitive material, etc., the hollow member such as a paper tube made of different materials and the flange attached to the end are separated and discarded. Can do.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the flange for a hollow member of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of one embodiment of a hollow member flange 20 according to the present invention, and FIG. 2 is a cross-sectional view including a central axis OO ′ and a straight line AA ′ perpendicular to the central axis OO ′ of FIG. . All of the hollow member flanges 20 are integrally formed of plastic, and have a disc (flange) 1 having a concentric hole 2 at the center and a constant distance from the hole 2 of the disc 1 along the central axis OO ′. A hollow cylindrical insertion member 3 extending in the length of is included. In order to increase the rigidity of the cylindrical insertion member 3, the ring-shaped member 4 extends from the distal end of the cylindrical insertion member 3 in the direction of the central axis OO ′ to a portion other than the bending piece 6 described later. Further, four slits 5 having the same length shorter than the length of the insertion member 3 are cut symmetrically with respect to the central axis OO ′ in the direction along the central axis OO ′ from the tip of the cylindrical insertion member 3. Since the two slits 5 and the remaining two slits 5 are relatively close to each other, two bending pieces 6 are formed between the two slits 5.
[0016]
The two bending pieces 6 are arranged symmetrically with respect to the central axis OO ′, extend from the insertion member 3 in a cantilevered direction along the central axis OO ′, and outward or When an inward force is applied, it bends outward or inward. And the tension piece 8 is connected via the bending line 7 of the front-end | tip of each bending piece 6, and the front-end | tip of the tension piece 8 is mutually connected via the bending line 9 on central axis OO '. ing. The length of each tension piece 8 is configured to be slightly longer than the radius of the cylindrical insertion member 3. It should be noted that the ends of the tension pieces 8 may not be connected via the fold line 9 or may be configured to be separable at the fold line 9 after molding or during use.
[0017]
Protrusions 12 that are radially outward from the central axis OO ′ are provided in the vicinity of the fold line 7 at the tip of each bending piece 6, and at the tip that contacts the fold line 9 of each tension piece 8. The protruding piece 10 facing the opposite side to the disk 1 side is provided, and the surface of the protruding piece 10 facing each other is defined as a surface 11.
Further, a helical screw projection 13 having a large screw pitch is provided on the outer periphery of the cylindrical insertion member 3 including the bending piece 6. As shown in FIG. 2, the cross section of the screw protrusion 13 along the central axis OO ′ is perpendicular to the inclined surface 14 extending outward from the distal end of the insertion member 3 to the disk 1 side and the inclined surface 14 on the disk 1 side. And a vertical surface 15 that is reduced in size.
[0018]
FIG. 3 is a view showing a state in which the tension pieces 8 connected to the distal ends of the respective bending pieces 6 and connected to each other at the distal ends are pushed into the cylindrical insertion member 3 beyond the thought point. In this state, the mutually facing surfaces 11 of the projecting pieces 10 provided at the tip of the projecting piece 8 abut each other so that the projecting piece 8 does not tilt into the cylindrical insertion member 3 beyond the angle of FIG. It has become. The length of the tension piece 8 is set to be slightly longer than the radius of the cylindrical insertion member 3 so that the bending piece 6 connected to the base of the tension piece 8 in the state shown in FIG. The angle with respect to the tension piece 8 of the surface 11 of the protrusion piece 10 is set.
[0019]
Since the structure is as described above, the hollow member flange 20 of this embodiment immediately after molding has a shape as shown in FIG. 1 and FIG. The brace piece 8 connected via is bent so as to come out of the cylindrical insertion member 3 at a fold line 7. In this position, the bending piece 6 remains in a molded state and is not bent outward or inward. In this state, when the projecting piece 10 of the projecting piece 8 is pushed in the direction of the disk 1 along the central axis OO ′, the projecting piece 8 settles to the state shown in FIG. 3 beyond the thought point, and the deflecting piece 6 faces outward. Therefore, the protrusion 12 provided at the tip of the bending piece 6 also expands in the radial direction.
[0020]
As shown in FIG. 4, at the end of the paper tube 21 of a roll-shaped photosensitive material 23 around which a strip-shaped long photosensitive material 22 such as photographic paper or photosensitive film is wound with a hollow paper tube 21 as a mandrel, In order to attach the flange 20, the hollow member flange 20 is inserted into the hollow member flange 20 in the direction indicated by the arrow in FIG. However, since the bending piece 6 is expanded in this state, the hollow member flange 20 does not enter the hole of the paper tube 21 simply by pushing in the arrow direction. Therefore, the hollow member flange 20 is rotated to the right, and is screwed into the paper tube 21 of the roll-shaped photosensitive material 23 using the spiral screw projection 13.
[0021]
FIG. 5 shows a state in which the expanded hollow member flange 20 is screwed into the paper tube 21 of the rolled photosensitive material 23. In this state, as a result of screwing using the screw projection 13, the expansion of the bending piece 6 is forcibly reduced, and the tensioning piece 8 is bent slightly as shown in the figure. The screw protrusion 13 bites into the inner surface of the paper tube 21. Accordingly, the hollow member flange 20 is firmly attached to the paper tube 21 of the roll-shaped photosensitive material 23 and does not come off.
[0022]
In the state of FIG. 4, the hollow member flange 20 can be screwed and attached in a reduced state of the bending piece 6 of FIG. 2, but after the screwing, the tension piece 8 is pulled back to the state of FIG. Since it may not always be easy to expand the protrusion 12 at the tip and bite into the inner surface of the paper tube 21, one may be selected depending on the conditions.
[0023]
When the photosensitive material 22 is used up in the state of FIG. 5, the paper tube 21 is slightly expanded because the winding force of the photosensitive material 22 is released as shown in FIG. Further, the paper tube 21 is slightly expanded by the force of the bent piece 6 in the expanded state. In this state, the bending due to the bending of the tension piece 8 is also straightened, and the protrusion 12 at the tip of the bending piece 6 slightly bites into the inner surface of the paper tube 21. In this state, as shown by an arrow in FIG. 6B, when a finger is inserted from the hole 2 of the disk 1 and the thrust piece 8 is pushed in the direction along the central axis OO ′, the point of thought is exceeded. As shown in FIG. In this state, the expansion of the bending piece 6 is released, and the protrusion 12 at the tip of the bending piece 6 does not bite into the inner surface of the paper tube 21. In this state, the fixation of the hollow member flange 20 to the paper tube 21 is released, so that both can be easily separated. If the protrusion 12 and the screw protrusion 13 still bite into the inner surface of the paper tube 21, it can be easily removed by rotating the hollow member flange 20 counterclockwise around the central axis OO ′.
[0024]
The above is an example in which the hollow member flange 20 of the present invention is attached to and detached from the end of the paper tube 21 of the roll-shaped photosensitive material 23. However, the hollow member flange 20 of the present invention is limited to this. Instead, it can also be used as a flange used at the end of another hollow member. FIG. 7 is a cross-sectional view of an example used as a resin flange attached to the end face of the metal pipe 31. Although the operation is the same as in the above embodiment, in the case of the metal pipe 31, it is necessary to provide a hole or recess 32 in which the protrusion 12 provided at the tip of the bending piece 6 bites in a predetermined position of the metal pipe 31 in the expanded state.
[0025]
Further, embodiments of the present invention will be described.
The cylindrical insertion member 3 may have a constant outer diameter, but as shown in FIG. 8B, the diameter may decrease in the insertion direction.
[0026]
Further, as shown in FIG. 8A, the helical screw protrusion 13 may be reduced in height in the insertion direction, but may be a certain height.
[0027]
Further, as shown in FIG. 8A, the spiral screw projection 13 gradually increases in height from the outer peripheral portion of the cylindrical insertion member 3 at the distal end portion farthest from the disc 1 (to the disc 1). Is preferred because it facilitates insertion.
[0028]
As shown in FIG. 8B, the cylindrical insertion member 3 has a diameter that decreases in the insertion direction, and the height of the helical screw protrusion 13 gradually increases in the insertion direction. It is desirable to make the outer periphery of the screw projection 13 constant except for the tip.
[0029]
The protrusion 12 provided at the distal end portion of the bending piece 6 may be a dot-like protrusion, or may be a linear protrusion along the width direction of the bending piece 6 (FIG. 1).
[0030]
The tension piece 8 may be provided with ribs along the longitudinal direction in order to obtain its strength (FIG. 9).
Moreover, the width | variety of the tension piece 8 can be selected suitably.
[0031]
About the shape of the tension piece 8, it is preferable that the parameter shown in FIG. 9 becomes the following ranges.
Parameter Recommended range δ 0.3-1mm
l ₁ -l ₀ 0.1-1.0mm
θ ₀ 10-45 °
θ ₁ 2θ ₀ + 0-30 °
t Reinforce with ribs to increase rigidity.
[0032]
In addition, numerical values of specific examples will be given.
A flange having the shape of FIG. 8B was integrally formed using a polystyrene resin containing carbon black. The tension piece 8 was formed with the following dimensions.
Parameter δ 0.5mm
l ₁ -l ₀ 0.75 mm (25.75-25 mm)
θ ₀ 15 °
θ ₁ 40 °
t 2mm
The width of the tension piece 8 was 20 mm. The protrusion 12 was a linear protrusion having a width of 20 mm.
After the photosensitive material was wound in a roll shape on a 2 mm thick paper tube, the flange was pushed in and inserted.
[0033]
As mentioned above, although the flange for hollow members of this invention has been demonstrated based on the Example, this invention is not limited to these Examples, A various deformation | transformation and use are possible.
[0034]
【The invention's effect】
As is clear from the above description, according to the flange for a hollow member of the present invention, a mechanism is provided for expanding or releasing the extension between the two bending pieces between the two bending pieces. In this state, the protrusion provided on the outer end of each bending piece is engaged with the inner surface of the end of the hollow member, and the flange for the hollow member is attached to the end of the hollow member. Since the flange for the member can be removed from the end of the hollow member, the flange and the hollow member can be separated with a simple one-touch operation. And the flange attached to the end thereof can be separated and discarded.
[Brief description of the drawings]
FIG. 1 is a perspective view of one embodiment of a flange for a hollow member according to the present invention.
2 is a cross-sectional view of the hollow member flange of FIG. 1;
FIG. 3 is a cross-sectional view showing a state in which a tension piece is pushed in.
4 is a cross-sectional view of the hollow member flange of FIG. 1 before being attached to the end of the roll-shaped photosensitive material.
5 is a cross-sectional view of the state in which the hollow member flange of FIG. 1 is attached to the end of a roll-shaped photosensitive material.
6 is a view for explaining an operation of removing the hollow member flange of FIG. 1; FIG.
FIG. 7 is a cross-sectional view of a state in which a resin flange for a metal pipe according to another embodiment is attached.
FIG. 8 is a diagram for explaining various embodiments of the present invention.
FIG. 9 is a diagram for illustrating parameters related to the shape of a tension piece.
[Explanation of symbols]
OO '... center axis AA' ... straight line 1 orthogonal to center axis ... disk (flange)
2 ... hole 3 ... hollow cylindrical insertion member 4 ... ring member 5 ... slit 6 ... flexible piece 7 ... bending line 8 ... bending piece 9 ... bending line 10 ... projecting piece 11 ... opposite (contact) surface 12 of the protruding piece ... Projection 13 ... Screw projection 14 ... Slope 15 of screw projection ... Vertical surface 20 of screw projection ... Flange 21 for hollow member ... Hollow paper tube 22 ... Long photosensitive material 23 ... Rolled photosensitive material 31 ... Metal pipe 32 ... Hole or Hollow

Claims (2)

A hollow member flange that is detachably attached to an end of a pipe-shaped hollow member, and has a disc having a concentric hole in the center, and a hole directly or from the hole along the central axis. Two bending pieces extending from the extending hollow cylindrical insertion member in a cantilevered manner symmetrically with respect to the central axis and in a direction along the central axis, and extending between the two bending pieces between the two bending pieces. Or a mechanism for releasing the expansion, all of which are integrally formed from plastic , and the protrusions provided on the outer ends of the respective bending pieces are expanded on the inner surface of the end of the hollow member in a state where the ends of the bending pieces are expanded. The hollow member flange is attached to the end of the hollow member so as to be engaged, and the hollow member flange is removable from the end of the hollow member in a state in which the expansion between the distal ends of the bending pieces is released . off for the sky member in that Nji. Hollow member flange of claim 1 Symbol mounting, characterized in that the elongate light-sensitive material is detachably attached to the end of the paper tube of the mandrel of the roll-shaped photosensitive material wound.

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