JP4898190B2 - Container gripping device - Google Patents

Description

  The present invention relates to a container gripping device for holding a container having a mouth such as a glass bottle by inserting a rubber-like elastic body into the mouth and making its diameter larger than the inner diameter of the mouth of the container. About.

  This type of gripping device is disclosed, for example, in Patent Document 1 below, and will be described with reference to FIG. FIG. 6 is a side view showing the upper half of the conventional gripping device 21 in a longitudinal direction. The gripping device 21 includes a rubber-like elastic body 22, a rod 23, a guide portion 24, a slider 25, a coil spring 26, a washer 28, and the like. The rod 23 has a metal rod shape, and a resin guide portion 24 having a tapered bullet shape is fixed to the tip. The rubber-like elastic body 22 is made of a highly elastic body such as butyl rubber or ethylene / propylene diene rubber, has a hollow cylindrical shape with a through-hole in the shaft core, has a hook-like portion 27 at the rear end, and has a front end surface as a guide portion. The rod 23 is inserted into contact with the rod 23. An annular recess 31 is formed at the tip of the rubber-like elastic body 22, and an annular tip 29 is fitted therein and fixed with an adhesive 32. The tip 29 is a rod together with the rubber-like elastic 22. Although it is inserted in 23, it cannot contact with the stepped portion 33 of the rod whose diameter has been expanded. The washer 28 is made of metal and has a perforated plate shape. The washer 28 is inserted into the rod 23 and fixed to the rear end surface of the flange-shaped portion 27. A metal slider 25 is inserted and fixed at the rear end of the rod 23, and a coil spring 26 is mounted between the slider 25 and the washer 28 to urge both of them outward.

  When the container is gripped by the gripping device 21, it is performed by a mounting device (not shown). The mounting device pushes the slider 25 forward with the washer 28 fixed. Then, the rod 23 is pushed forward, and the tip of the rubber-like elastic body 22 is pushed forward together with the rod 23 by the action of the tip 29, but the rear hook-like portion 27 is fixed to the washer 28. The rubber-like elastic body 22 is elongated in the front-rear direction, and the diameter is reduced. When the slider 25 is freed after being inserted into the mouth of the container in this state, the slider is retracted by the action of the coil spring 26, and the tip of the rod 23 and the rubber-like elastic body 22 is also retracted. The body 22 returns to its original length, and its diameter also returns to its original thickness and presses against the inside of the mouth of the containers.

As described above, after the rubber-like elastic body 22 is fitted inside the mouth of the containers and grips the containers, the gripping device 21 is, for example, a surface treatment apparatus as shown in Patent Document 2 below. It can be used for applications such as coating the surfaces of containers. When the containers are opened, the slider 25 is pushed out to reduce the diameter of the rubber-like elastic body 22 in the same manner as described above.
JP 2002-301680 A JP 2000-281385 A

  This type of conventional gripping device has a problem in durability, and the rubber-like elastic body 22 is damaged particularly in the portion A (near the tip 29) and the portion B (near the rear end of the rubber-like elastic body 22) in FIG. There was a problem of doing. The present invention confirms the cause of cutting in part A (near the tip 29) and part B (near the rear end of the rubber-like elastic body 22), prevents the rubber-like elastic body from being cut in that part, and holds the gripping device. It has been made as an object to improve the durability of.

The present invention has a rod, a tapered guide portion fixed to the tip of the rod, a hollow cylindrical shape, a hook-like portion at the rear end, and the tip surface is brought into contact with the guide portion and inserted into the rod. And an annular tip that is fitted and fixed in an annular recess formed at the tip portion of the rubber-like elastic body, and is inserted into the rod together with the rubber-like elastic body so as not to retract. It has a core and a perforated plate, has a washer that is inserted into the rod and fixed to the rear end surface of the flange-like portion, and the rod is advanced to extend the rubber-like elastic body, thereby reducing the diameter. In the apparatus for inserting into the mouth of the container in a state, retracting the rod after insertion to return the diameter of the rubber-like elastic body to the original, and pressing the inner peripheral surface of the container mouth to grip the container, the tip so that the entire back surface, such as the axial longitudinal half shape upwardly convex curve on the cross section of the R Johasu That the content has a gripping device containers characterized by.

Regarding the above-described conventional gripping device 21 (the back surface shape of the tip core 29 is shown as “conventional example” on the right side of FIG. 4), when the rod 23 is pushed forward, the stress generated in the rubber-like elastic body 22 and on the surface is examined. It was. The “conventional example” shown in FIG. 5 is a normal direction stress that acts to separate the annular recess 31 of the rubber-like elastic body 22 from the back surface of the tip 29. As shown in FIG. 7, the tip 29 and the annular recess 31 of the rubber-like elastic body 22 are bonded with an adhesive 32, but the stress in the normal direction causes the bond to be pulled away in a direction perpendicular to the surface. Works. As is clear from FIG. 5, the stress in the normal direction of the conventional example is large overall, especially at the lower end, so that the adhesion begins to peel upward from the lower end, and as shown in FIG. It is considered that the peeled portion 34 is peeled off. Then, when the peeling part 34 has arisen, when the stress which generate | occur | produces in the rubber-like elastic body 22 and the surface was investigated, it became like FIG. The horizontal axis in FIG. 8 is time. “Rubber stretching” means that the rod is pushed forward and the elastic elastic body is stretched. “Mouth insertion” is when the gripping device is inserted into the container (glass bottle) mouth. “Rubber return” indicates when the rod is retracted and the rubber-like elastic body returns. "A- distal side""B- root side" is the stress placed easily A portion及beauty B portion of the damage in FIG. It can be seen that a very large stress is generated in the A portion and a relatively small stress is generated in the B portion.

  As a result of the above consideration, the cause of the breakage of the A portion on the front end side is that the adhesion between the back surface of the tip 29 and the annular recess 31 of the rubber-like elastic body 22 is peeled off and the peeling portion 34 is generated. It can be concluded that the stress is very large. Further, the cause of the breakage of the B portion on the base side is thought to be due to wear due to rubbing against the container mouth or deterioration of the elastic material because the generated stress is small.

  As a countermeasure against breakage of the tip side A portion, the back surface of the tip was changed to an R-shaped slope whose cross section had a convex curve. As a result, the normal stress acting so as to separate the annular concave portion of the rubber-like elastic body from the back surface of the tip core is reduced, and the peeling portion is less likely to be generated. Therefore, the stress generated in the A portion is reduced, and the A portion Damage is reduced. The upward convex curve is more preferably an arc.

  The average slope of the R-shaped slope is preferably 0.1 or more and 1.0 or less. If the average inclination is less than 0.1, the bonded portion of the rubber-like elastic body becomes too long, which is not preferable. When it is 1.0 or less, the effect of reducing the normal direction stress is particularly large, which is preferable. In FIG. 2, the average slope is y / x where a is the point where the R-shaped slope starts, b is the end point, x is the horizontal distance between ab, and y is the vertical distance.

Also it is Oite to the onset bright, the rubber-like elastic material the outer periphery of the just distal side of the said flange portion to form an annular groove.

  As described above, the cause of the breakage of the B portion on the base side is due to wear caused by rubbing against the container mouth portion or deterioration of the elastic material, so that the rubber-like elastic body 2 near the front end of the bowl-like portion 7 is used. When the annular groove 14 is formed on the outer periphery, the portion does not rub against the container mouth, and the breakage of the portion B is reduced.

  The gripping device of the present invention is excellent in durability because damage at the tip end side (A portion) and the root side (B portion) of the rubber-like elastic body, which is the most damaged part, is reduced.

  FIG. 1 is a side view showing the upper half of the gripping device 1 in a longitudinal direction, FIG. 2 is an enlarged explanatory view of the vicinity of the tip 9 of the gripping device 1, and FIG. 3 is a front end side and a root side of the rubber-like elastic body 2. FIG. 4 is an explanatory view of the back surface shape of the tip of the gripping device 1 of the embodiment and the gripping device 21 of the conventional example, and FIG. 5 is a tip of the gripping device 1 of the embodiment and the tip of the gripping device 21 of the conventional example. It is explanatory drawing of the normal direction stress which acts so that the cyclic | annular recessed part of a rubber-like elastic body may be pulled apart from the back surface.

  The gripping device 1 includes a rubber-like elastic body 2, a rod 3, a guide portion 4, a slider 5, a coil spring 6, a washer 8, and the like. The rod 3 is made of a metal such as stainless steel, has a rod shape, and a resin guide portion 4 having a tapered bullet shape is fixed to the tip. The rubber-like elastic body 2 is made of a highly elastic body such as ethylene / propylene diene rubber, has a hollow cylindrical shape having a through hole in the shaft core, has a flange-like portion 7 integrally formed at the rear end, and the front end surface is a guide portion 4. The rod 3 is inserted into contact with the rod 3. An annular recess 31 is formed on the inner surface of the tip end portion of the rubber-like elastic body 2, and an annular tip 9 (made of metal such as stainless steel) is fitted therein and fixed with an adhesive 12, which is rubber-like. Although it is inserted in the rod 3 together with the elastic body 2, it comes into contact with the stepped portion 13 whose diameter has been increased and cannot be retracted. The washer 8 is made of a metal such as stainless steel and has a perforated plate shape. The washer 8 is inserted into the rod 3 and is fixed to the rear end surface of the flange-shaped portion 7. A slider 5 made of metal such as stainless steel is inserted and fixed at the rear end of the rod 3, and a coil spring 6 is mounted between the slider 5 and the washer 8 to urge both sides outward.

  As shown in FIGS. 2 and 3, the back surface shape of the lead core 9 is an R-shaped down slope whose section is an upwardly convex curve (arc), and the average slope is 0.23. . About this example, when the rod 3 was pushed forward, the stress generated in the rubber-like elastic body 2 and on the surface was examined. In FIG. 5, “Example” indicates a normal direction stress that acts to separate the annular recess 11 of the rubber-like elastic body 2 from the back surface of the tip 9. As is apparent from the figure, the normal direction stress of the embodiment is extremely small as compared with the conventional example, and therefore there is no possibility that the adhesion between the tip 9 and the annular recess 11 is peeled off. FIG. 3 shows the stress generated on the tip side (A portion in FIG. 6) and the base side (B portion in FIG. 6) of the rubber-like elastic body 2, but it is generated on the tip side as compared with the conventional example of FIG. The stress to be reduced is reduced by about 35%. Therefore, the breakage of the A portion is reduced.

  An annular groove 14 is formed on the base side of the rubber-like elastic body 2, that is, on the outer periphery near the front end of the flange-like portion 7. As can be seen from the comparison between FIG. 3 and FIG. 8, on the base side, the embodiment generates a slightly larger stress than the conventional example, but by providing the annular concave groove 14, it does not rub against the container mouth. , Damage to the root portion (B portion) is reduced.

  Compared with the conventional gripping device, the gripping device of this example has an average period (life) from the start of use to breakage of about 10 times, confirming improvement in durability.

It is a side view which cuts and shows the upper half of the holding apparatus 1 of an Example vertically. FIG. 4 is an enlarged explanatory view of the vicinity of the tip 9 of the gripping device 1. It is stress explanatory drawing of the front end side of a rubber-like elastic body 2, and a base side. It is explanatory drawing of the back shape of the tip of the grip apparatus 1 of an Example, and the grip apparatus 21 of a prior art example. It is explanatory drawing of the normal direction stress which acts so that the annular recessed part of a rubber-like elastic body may be pulled away from the back surface of a tip. It is a side view which cuts and shows the upper half of the grasping apparatus 21 of a prior art example. FIG. 6 is an enlarged explanatory view of the vicinity of a tip 29 of the gripping device 21. FIG. 4 is an explanatory diagram of stresses on the front end side and the root side of the rubber-like elastic body 22.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grabbing device 2 Rubber-like elastic body 3 Rod 4 Guide part 5 Slider 6 Coil spring 7 Gutter-like part 8 Washer 9 Tip core 10 R-shaped slope 11 Annular recess 12 Adhesive 13 Step part 14 Annular groove 21 Grabbing apparatus 22 Rubber-like elasticity Body 23 Rod 24 Guide part 25 Slider 26 Coil spring 27 Gutter-shaped part 28 Washer 29 Lead core 30 Rear end face 31 Annular recess 32 Adhesive 33 Step part 34 Peeling part

Claims (3)

The rod,
A tapered guide part fixed to the tip of the rod;
A rubber-like elastic body that has a hollow cylindrical shape, has a hook-like portion at the rear end, and is inserted into the rod with a front end surface in contact with the guide portion;
An annular tip that is internally fitted and fixed in an annular recess formed at the tip of the rubber elastic body, and is inserted into the rod together with the rubber elastic body so as not to be retractable;
A perforated plate, having a washer inserted through the rod and fixed to the rear end surface of the bowl-shaped portion;
The rod is advanced to extend the rubber-like elastic body, and is inserted into the mouth of the container with a reduced diameter. After insertion, the rod is retracted to return the diameter of the rubber-like elastic body to the original position. In a device for gripping containers by being pressed against the inner peripheral surface of
A container gripping device characterized in that the back surface of the tip is an R-shaped slope whose upper half shape in an axial longitudinal section is a convex curve.   2. The gripping device according to claim 1, wherein an average slope of the R-shaped slope is 0.1 or more and 1.0 or less. The gripping device according to claim 1 or 2,
An apparatus for gripping containers or the like, characterized in that an annular groove is formed in the outer periphery of the rubber-like elastic body near the tip of the bowl-shaped portion.

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