JP3911450B2 - Apparatus for measuring circumferential break line strength of container lids - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a top wall and a skirt wall that hangs down from the periphery of the top wall, and the skirt wall has a circumferential break line extending in the circumferential direction. It relates to a device for measuring.
[0002]
[Prior art]
As is well known, container lids having tamper evidence characteristics (tamper evident characteristics) are widely used as container lids for beverage containers. Such a container lid is formed of an appropriate metal sheet such as an aluminum sheet, a chromic acid-treated sheet and a tin sheet, or an appropriate synthetic resin such as polyethylene and polypropylene, and has a circular top wall and a cylinder suspended from the periphery of the top wall. With shaped skirt walls. The skirt wall is formed with a circumferential break line extending in the circumferential direction, and the skirt wall is divided into a main part above the circumferential break line and a tamper evidence hem below the circumferential break line. Yes. The circumferential break line is usually composed of a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions left between the slits. When the container lid is made of synthetic resin, a female thread is formed on the inner peripheral surface of the main part of the skirt wall, and an appropriate form of locking means is provided on the inner peripheral surface of the tamper evidence skirt. Is formed.
[0003]
A container to which the container lid of the above-described form is applied has a cylindrical mouth-neck portion with an open upper end, and a male thread on the outer peripheral surface of the mouth-neck part is located below the male thread. A stop jaw is formed. When the container lid is formed of a thin metal plate, when sealing the mouth and neck by attaching the container lid to the mouth and neck of the container, the container lid is fitted on the mouth and neck, and then the mouth and neck A female thread is formed in the main part of the skirt wall in correspondence with the male thread, and the free end of the tamper evidence hem is deformed radially inward to be locked to the locking jaw of the mouth and neck. Let me. If the container lid is made of synthetic resin, fit the container lid on the mouth and neck of the container, rotate the container lid in the closing direction, and place the male thread on the neck of the mouth and neck on the skirt wall of the container lid. The formed female thread is screwed together. Thus, the container lid is lowered with the rotation, and the locking means formed on the tamper evidence skirt elastically rides over the locking jaw of the mouth and neck and is engaged therewith. When opening the mouth and neck of the container, the container lid is rotated in the opening direction. In this way, the container lid does not rise with rotation due to the cooperation between the male thread and the female thread. However, the tamper evidence skirt is prevented from rising because it is locked to the locking jaw of the mouth and neck. Therefore, a considerable stress is generated in the circumferential break line formed in the skirt wall, more specifically, in the bridge portion, the bridge portion in the circumferential break line is broken, and the tamper evidence skirt portion is in the skirt wall. Separated from the main part. Alternatively, at least one of the bridging portions is maintained without being broken, and the axial break line formed at the tamper evidence skirt is broken to open the tamper evidence skirt from an endless annular shape to an end band shape. It is. Thereafter, the container lid leaves the separated tamper evidence hem at the mouth and neck, or continues to be connected to the main part of the skirt wall by at least one bridging part. In addition, it is lifted with rotation and is released from the mouth and neck.
[0004]
[Problems to be solved by the invention]
Thus, in the container lid of the above-described form, the strength of the circumferential break line needs to be within a predetermined range. If the strength of the circumferential break line is excessively small, the circumferential break line may be broken when the container lid is attached to the mouth and neck of the container. Conversely, if the strength of the circumferential break line is excessively large, it becomes difficult to break the circumferential break line as required when opening the mouth-neck portion of the container. Therefore, it is desirable to measure whether the strength of the circumferential break line is within the required range for the prototype container lid or the selected sample container lid in the container lid that is actually manufactured and sold. Not a few. However, a sufficiently satisfactory device for measuring the strength of the circumferential break line has not yet been developed, and conventionally, the measurement of the strength of the circumferential break line requires complicated manual work, and also It was not always possible to measure accurately due to the need for complicated manual work.
[0005]
The present invention has been made in view of the above-mentioned facts, and its main technical problem is to provide a new and excellent apparatus capable of measuring the strength of the circumferential break line of the container lid sufficiently easily and sufficiently accurately. It is to be.
[0006]
[Means for Solving the Problems]
According to the present invention, as an apparatus for achieving the above main object, the apparatus has a top wall and a skirt wall that hangs down from the periphery of the top wall, and a circumferential break line that extends in the circumferential direction is formed on the skirt wall. An apparatus for measuring the strength of the circumferential break line in the container lid,
A stationary support means having a cylindrical or frustoconical protrusion, the outer diameter of at least the base end of the protrusion being substantially the same as the inner diameter of the skirt wall of the container lid;
A pressure head mounted on the projecting portion of the stationary support means so as to be movable in the direction of the central axis, and a pressure means having an input rod extending from the back surface of the pressure head in the direction of the central axis;
A plurality of fastening means mounted circumferentially spaced around the protrusion of the stationary support means and movably mounted in the radial direction;
A portion of the container lid that is fitted to the pressure head of the pressure means and the protrusion of the stationary support means on the skirt wall on the free end side from the circumferential break line is fastened to the protrusion. A forcing means for forcing the fastening means piece radially inward to fasten with the means;
Moving means for acting on the free end of the input rod of the pressurizing means to move the pressurizing head away from the protrusion of the stationary support means;
Measuring means for measuring the force applied from the moving means to the pressurizing means;
There is provided an apparatus comprising:
[0007]
Each of the fastening means has an arcuate inner peripheral edge that is engaged with a portion of the skirt wall of the container lid that is closer to a free end side than the circumferential break line, and an inclined arcuate outer peripheral surface, and the forcing means Is composed of an annular member having a frustoconical inner peripheral surface that is engaged with the inclined arc-shaped outer peripheral surface of the fastening means, and the fastening means is moved in the radial direction by moving the annular member in the central axis direction. It is preferred to be forced inward. Preferably, the stationary support means is formed with a male thread, and the annular member is formed with a female thread that is screwed onto the male thread, and the annular member is attached to the stationary support means. By rotating it, the annular member is moved in the direction of the central axis.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an apparatus configured according to the present invention will be described in detail with reference to the accompanying drawings.
[0009]
1 and 2 illustrate a preferred embodiment of an apparatus for measuring the circumferential break line strength of a container lid constructed in accordance with the present invention. The apparatus includes an upright stationary column 2 and a movable member 4 extending substantially vertically. The movable member 4 is mounted so as to be movable in the vertical direction, and is connected to a drive source 6 which may be an electric motor via an appropriate transmission mechanism (not shown), and can be adjusted at a required speed adjustable by the drive source 6. It is moved up and down (the drive source 6 and the movable member 4 constitute a moving means for moving a pressure head described later in a required direction). A load measuring means 8 is fixed to the front surface of the movable member 4. The measuring means 8 includes an output rod 10 disposed at the upper end thereof and a display 12 disposed on the front surface thereof, and electrically measures a load acting on the output rod 10 and displays the measured value. Conveniently the form displayed on the vessel 12. The stationary column 2, the movable member 4, and the drive source 6 may be of a known form that is commercially available, and can be conveniently configured, for example, from an electric measurement stand sold as “MV Series” by Imada Co., Ltd. Similarly, the measuring means 8 may be of a known form that is commercially available, and can be conveniently configured from, for example, a digital force gauge sold as “DPX series” by Imada Corporation.
[0010]
1 and 2, the stationary column 2 has a top plate 14, and a stationary support means 18 is fixed on the top plate 14 via a connection plate 16. The stationary support means 18 has a substantially columnar shape as a whole, a lower part 20 having a cylindrical outer peripheral surface, an intermediate part 22 having a slightly larger diameter than the lower part, an upper part 24 and an upper part 24 having a slightly smaller diameter than the lower part 20. And a protruding portion 26 protruding upward. A fastening bolt 28 (a single fastening bolt 28 is shown in FIG. 1) is screwed onto the lower surface of the stationary support means 18 through the connection plate 16 at a plurality of locations spaced in the circumferential direction. In addition, fastening bolts 30 (two fastening bolts 30 are shown in FIG. 1) are also passed through the connection plate 16 at a plurality of locations spaced in the circumferential direction on the top plate 14 of the stationary column 2. Thus, the stationary support means 18 is fixed to the top plate 14 of the stationary column 2. A male thread 32 is formed on the outer peripheral surface of the lower portion 20 of the stationary support means 18. The outer peripheral surface of the protruding portion 26 of the stationary support means 18 has a truncated cone shape whose outer diameter gradually decreases upward. If desired, the outer peripheral surface of the protrusion 26 can be cylindrical. The stationary support means 18 is formed with a through hole 34 extending through the central portion thereof, and the upper portion of the through hole 34 has a relatively small diameter and the lower portion has a relatively large diameter. In alignment with the through hole 34, a relatively small diameter opening 36 is formed in the connection plate 16, and a relatively large diameter opening 38 is formed in the top plate 14.
[0011]
A pressurizing means 40 is attached to the stationary support means 18. The pressurizing unit 40 includes a substantially disc-shaped pressurizing head 42 placed on the upper surface of the protruding portion 26 of the stationary support unit 18, and an input rod 44 fixed to the back surface or lower surface of the pressurizing head 42. It consists of and. An annular recess 46 is formed on the upper surface of the pressure head 42, and a peripheral edge 48 outside the annular recess 46 is somewhat submerged from the central portion inside the annular recess 46. The input lot 44 extends from the lower surface of the pressure head 42 downward in the central axis direction, and includes a through hole 34 formed in the stationary support means 18, an opening 36 formed in the connection plate 16, and the top plate 14. The lower end extends beyond the top plate 14 and extends downward.
[0012]
Three fastening means 50 are disposed on the outer periphery of the upper portion 24 of the stationary support means 18 at equal angular intervals in the circumferential direction. Each of the fastening means 50 in the illustrated embodiment includes a sliding member 52 and a claw member 54. The inner peripheral surface of each of the sliding members 52 has an arc shape that forms a part of a cylindrical shape, but the outer peripheral surface has an inclined arc shape that forms a part of an inverted frustoconical shape whose outer diameter gradually increases upward. The inner diameter of the inner peripheral surface corresponds to the outer diameter of the upper portion 24 of the stationary support means 18. The sliding member 52 is formed with a pair of guided through-holes 60 that extend substantially horizontally and parallel to each other, and a recess 62 positioned between the pair of guided through-holes 60 is formed on the inner peripheral surface of the sliding member 52. Is formed. On the other hand, three pairs of guide pins 64 are disposed on the outer peripheral surface of the upper portion 24 of the stationary support means 18 so as to correspond to each of the three fastening means 50. Each of the guide pins 64 is attached to the upper portion 24 by screwing the inner portion thereof into a female screw hole formed on the outer peripheral surface of the upper portion 24, and extends substantially horizontally from the outer peripheral surface of the upper portion 24. Yes. The two guide pins 64 forming a pair extend in parallel to each other. On the outer peripheral surface of the upper portion 24 of the stationary support means 18, a recess 66 is also formed that is positioned between each pair of guide pins 64. Each of the sliding members 52 receives the guide pins 64 in the guided through holes 60 and is slidably mounted along the guide pins 64 in a direction approaching and separating from the outer peripheral surface of the upper portion 24 of the stationary support means 18. Has been. A compression coil spring 68 is interposed between the concave portion 66 formed on the outer peripheral surface of the upper portion 24 of the stationary support member 18 and the concave portion 62 formed on the inner peripheral surface 56 of the sliding member 52, so that sliding is possible. The member 52 is elastically biased in a direction away from the upper portion 24 of the stationary support means 18 by the elastic biasing action of the compression coil spring 68. An arc-shaped ridge 70 projecting upward is formed on the outer peripheral edge of the upper surface of each sliding member 52.
[0013]
The claw member 54 of the fastening means 50 includes an arc-shaped outer peripheral surface extending along the inner peripheral surface of the arc-shaped protrusion 70 of the sliding member 52, and an arc-shaped inner peripheral surface extending along the lower end of the outer peripheral surface of the protruding portion 26 of the stationary support means 18. It is comprised from the arc-shaped board which has. The claw member 54 is formed with a pair of through holes extending in the vertical direction. The claw member 54 is fixed to the slide member 52 by screwing the fastening bolts 72 to the slide member 52 through the pair of through holes. ing. Accordingly, the pawl member 54 is slidable along the guide pin 64 along the guide pin 64 in a direction approaching and separating from the upper portion 24 of the stationary support means 18, and away from the upper portion 24 by the compression coil spring 68. It is biased elastically.
[0014]
The stationary support means 18 is also equipped with a forcing means 74 for forcing the fastening means 50 inward in the radial direction, that is, in a direction approaching the upper portion 24 of the stationary support means 18. The forcing means 74 includes a substantially cylindrical forcing member 76 as a whole. The forcing member 76 includes a lower part 78 having a cylindrical inner peripheral surface, an intermediate part 80 having a cylindrical inner peripheral surface, and an upper part having an inverted frustoconical inner peripheral surface whose inner diameter gradually decreases upward. 82. The inner diameter of the lower portion 78 of the forcing member 76 corresponds to the outer diameter of the lower portion 20 of the stationary support means 18, the inner diameter of the intermediate portion 80 corresponds to the outer diameter of the intermediate portion 22 of the stationary support means 18, and the truncated cone of the upper portion 82. The shape corresponds to the inclined arc-shaped outer peripheral surface of the sliding member 52. A female thread 84 is formed on the inner peripheral surface of the lower portion 78 of the forcing member 76, and the female thread 84 is screwed into the male thread 32 formed on the outer peripheral surface of the lower portion 20 of the stationary support means 18. I'm hurt. Therefore, when the forcing member 76 is rotated clockwise in FIG. 2, the forcing member 76 is lowered with respect to the stationary support means 18, and when the forcing member 76 is rotated counterclockwise in FIG. The forcing member 76 is raised relative to the means 18.
[0015]
The upper half portion 86 of the outer peripheral surface of the lower portion 78 of the forcing member 76 is formed in a regular hexagonal shape. A rotating tool 88 is detachably attached to the upper half 86 of the outer peripheral surface of the lower portion 78 of the forcing member 76. The rotating tool 88 has an annular portion 90. On the inner peripheral surface of the annular portion 90, there are 12 isosceles triangular immersed portions 92 corresponding to the regular hexagonal corner portions 12 spaced apart in the circumferential direction. Individually formed. The rotating tool 88 further includes two gripping portions 94 that extend in the radial direction from two portions of the annular portion 90 that face each other in the diametrical direction. As can be clearly understood by referring to FIG. 2, such a rotating tool 88 is fitted onto the forcing member 76 and lowered, and is located at every other one of the twelve recessed portions 92. By accepting the six corners of the upper half 86 of the outer peripheral surface of the lower portion 78 of the forcing member 76 in the respective recessed portions 92, they are detachably attached to the lower portion 78 of the forcing member 76. If the gripping portion 94 of the rotating tool 88 is gripped and the rotating tool 88 is rotated counterclockwise in FIG. 2, the forcing member 76 moves in the direction of the central axis along with the rotation, that is, is raised with the rotation. The inner peripheral surface of the inverted frustoconical shape in the upper part 82 is raised relative to the inclined arc-shaped outer peripheral surface of the sliding member 52 in the fastening means 50, whereby the fastening means 50 resists the elastic biasing action of the compression coil spring 68. Forced radially inward. When the rotating tool 88 is rotated in the clockwise direction in FIG. 2, the forcing means 74 is moved to the opposite side in the central axis direction along with the rotation, that is, is lowered with the rotation. The peripheral surface is lowered with respect to the inclined arc-shaped outer peripheral surface of the sliding member 52 in the fastening means 50, whereby the fastening means 50 is moved radially outward by the elastic biasing action of the compression coil spring 68.
[0016]
FIG. 3 shows a typical example of a container lid in which the strength of the circumferential break line is measured by the apparatus shown in FIGS. 1 and 2. The container lid, generally designated 96, includes a shell 98 formed from a thin metal plate, which may be an aluminum thin plate. The shell 98 has a circular top wall 100 and a cylindrical skirt wall 102 depending from the periphery of the top wall 100. An annular bulging portion 104 is formed at the lower portion of the skirt wall 102, and a circumferential break line 106 is formed in the intermediate region in the central axial direction of the annular bulging portion 104. The circumferential break line 106 includes slits (cut grooves) 108 that extend in the circumferential direction at intervals in the circumferential direction, and a bridging portion 110 that remains between the slits 108. An annular recess 112 is formed in the upper part of the skirt wall 102, and an annular knurl (unevenness) 114 is formed above the annular recess 112. A liner 116 that can be formed from an appropriate synthetic resin such as soft polyethylene is disposed on the inner surface of the top wall 100. An annular seal portion 118 is formed on the peripheral portion of the liner 116.
[0017]
When measuring the breaking strength of the circumferential breaking line 106 of the container lid 96, the rotating member 88 is operated to lower the forcing member 76 somewhat from the position shown in FIG. The inner peripheral surface of the member 54 is separated from the lower end portion of the outer peripheral surface of the projecting portion 26 of the stationary support means 18 in the radially outward direction. Then, as shown by a two-dot chain line in FIG. 1, the container lid 96 is fitted on the pressure head 42 and the protruding portion 26, and the lower end portion of the skirt wall 102 of the shell 98 of the container lid 96, that is, from the circumferential break line 106. Also, the free end portion is positioned between the lower end portion of the outer peripheral surface of the protruding portion 26 and the inner peripheral surface of the claw member 54. An annular seal portion 118 in the liner 116 disposed on the inner surface of the top wall 100 of the shell 98 is positioned in an annular recess 46 and a sinking peripheral edge 48 formed on the upper surface of the pressure head 42. Conveniently, the outer diameter of the lower end of the outer peripheral surface of the protrusion 26 is substantially the same as or slightly smaller than the inner diameter of the lower end of the skirt wall 102. Then, the rotating member 88 is operated to raise the forcing member 76 to move the claw member 54 radially inward, and thus between the lower end portion of the outer peripheral surface of the protruding portion 26 and the inner peripheral surface of the claw member 54. Fasten the lower end of the skirt wall 102 firmly enough. Thereafter, the drive source 6 is energized to raise the movable member 4 and thus the measuring means 8 fixed thereto. When the measuring means 8 is raised, the tip of the output rod 10 is brought into contact with the lower end of the input rod 44 of the pressurizing means 40, and thereafter the shell of the container lid 96 is moved according to the rising of the measuring means 8. A force forcing upward is applied to 98 top wall 100. The force applied to the top wall 100 is transmitted to the circumferential break line 106 formed in the skirt wall 102, and more specifically to the bridging portion 110 thereof. When the force applied to the top wall 100 is increased and exceeds a certain value, at least some of the bridging portions 110 of the circumferential break line 106 are broken. In this way, the force applied to the input rod 44 of the pressurizing means 40, that is, the force acting on the output rod 10 of the measuring means 8, which has been gradually increased until then, is rapidly reduced. Accordingly, the breaking strength of the circumferential break line 106 can be measured by measuring the maximum force acting on the output rod 10 of the measuring means 8 (the maximum force is displayed on the display 12 of the measuring means 8). it can.
[0018]
【The invention's effect】
According to the apparatus of the present invention, the strength of the circumferential break line of the container lid can be measured sufficiently easily and sufficiently accurately.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the main parts of a preferred embodiment of an apparatus constructed in accordance with the present invention.
FIG. 2 is a plan view of the apparatus shown in FIG.
FIG. 3 is a front view partially showing a cross section of a typical example of a container lid that can measure the strength of a circumferential break line by the apparatus shown in FIGS.
[Explanation of symbols]
4: Movable member (moving means)
6: Driving source (moving means)
8: Measuring means 18: Static support means 26: Protruding portion 32: Male thread 40: Pressurizing means 42: Pressurizing head 44: Input rod 50: Fastening means 52: Sliding member 54: Claw member 74: Forcing means 76; Forcing member 84: female thread 88: rotating tool 96: container lid 98: shell 100: top wall 102: skirt wall 106: circumferential break line 116: liner

Claims (3)

Measuring the strength of the circumferential break line in a container lid having a top wall and a skirt wall depending from the periphery of the top wall, and a circumferential break line extending in the circumferential direction is formed on the skirt wall Make it a device for
A stationary support means having a cylindrical or frustoconical protrusion, the outer diameter of at least the base end of the protrusion being substantially the same as the inner diameter of the skirt wall of the container lid;
A pressure head mounted on the projecting portion of the stationary support means so as to be movable in the direction of the central axis, and a pressure means having an input rod extending from the back surface of the pressure head in the direction of the central axis;
A plurality of fastening means mounted circumferentially spaced around the protrusion of the stationary support means and movably mounted in the radial direction;
A portion on the free end side of the circumferential break line in the skirt wall of the container lid fitted to the pressure head of the pressure means and the protrusion of the stationary support means is fastened to the protrusion. Forcing means for forcing the fastening means radially inward to fasten with the means;
Moving means for acting on the free end of the input rod of the pressurizing means to move the pressurizing head away from the protrusion of the stationary support means;
Measuring means for measuring the force applied from the moving means to the pressurizing means;
The apparatus characterized by comprising. Each of the fastening means has an arcuate inner peripheral edge that is engaged with a portion of the skirt wall of the container lid that is closer to a free end side than the circumferential break line, and an inclined arcuate outer peripheral surface, and the forcing means Is composed of an annular member having a frustoconical inner peripheral surface that is engaged with the inclined arc-shaped outer peripheral surface of the fastening means, and the fastening means is moved in the radial direction by moving the annular member in the central axis direction. The apparatus of claim 1, wherein the apparatus is forced inward. The stationary support means is formed with a male thread, and the annular member is formed with a female thread that is screwed to the male thread, and the annular member is rotated with respect to the stationary support means. The apparatus according to claim 2, wherein the annular member is moved in the direction of the central axis.

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