JPS6135814Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sealing device for containers such as pail cans.

A pail is a bucket-shaped container made of steel plate or the like, and is used as a container for petroleum, paints, chemicals, oils, and the like. There are two types of pail cans: the T-shape, which has a tapered body and a trapezoidal cross section whose area becomes smaller toward the bottom of the bucket-like container, and the S-shape, which has a straight body and is a completely cylindrical container. When storing empty pail cans after use, T-shaped cans require less space by stacking them like buckets, but S-shaped cans cannot be stacked and require a large amount of space. For these reasons, T-shaped pails are preferred.

Now, a device called a hot melt is known which is used in combination with such a pail can.

FIG. 1 is a sectional view showing the structure of hot melt. In the figure, a pail 1 contains an adhesive 2 that is solid at room temperature, for example. The heating platen 3 is similar to the lid of the pail can 1, and has a heater (not shown) embedded therein, so that the adhesive can be heated to a molten state 2a. Further, a pump 4 is attached to the platen 3. This pump 4 sucks out the adhesive 2a in a molten state and sends it to a gun (not shown). For example, when bonding parts together, the gun sprays the delivered adhesive onto a desired part of the parts to be bonded.

That is, a hot melt is made up of a lid-shaped heating platen 3 placed on the opening surface of a pail can 1 containing adhesive, for example, and the platen 3 is
It can be said that this is a device in which air pressure or the like is applied in the direction of the adhesive to heat the adhesive 2 to a molten state 2a, which is then sent to a gun (not shown) by a pump 4. However, for such operation to be successful, it is necessary that the sides of the platen 3 and the inner wall of the pail 1 are in airtight contact. This is because if this part is not airtight, when the platen 3 is pushed in the direction of arrow 5 by air pressure, the molten adhesive 2a will leak from that part.
This is because the pump 4 will no longer be able to send the adhesive 2a to the gun. For this reason, platen 3
A seal 6 is used between the side part of the pail can 1 and the inner wall of the pail can 1 to make the gap airtight.

FIG. 1A is a structural explanatory diagram of the seal 6 in FIG. 1. As seen in the same figure, seal 6
consists of a coil spring 62 arranged inside a rubber tube 61, the rubber tube 61 is wound around a groove on the side of the plate 6, and the ends are connected to each other by hooks 63 formed at the ends of the coil 62. are doing.

When a seal with such a structure is used, as the platen 3 descends in a hot melting machine, the seal becomes hard due to the taper of the body of the pail 1, and the platen 3 is lowered beyond a certain limit. However, there was a disadvantage that unused adhesive etc. were left at the bottom of the pail can, which was uneconomical. Also, a coil spring 6 is attached to the rubber tube 61.
3, the ends of the rubber tube 61 are brought together and connected after being wound around the groove on the side of the platen 3, so there is inevitably one seam, which is where the adhesive leaks. ) also had the disadvantage of occurring.

This invention was made to eliminate the drawbacks of the prior art as described above, and the purpose of this invention is to allow the platen to smoothly descend from the top surface to the bottom surface of the pail when used for hot melt. An object of the present invention is to provide a sealing device that can be used without causing leakage.

The main point of the structure of this invention is that an annular member made of an elastic material and having a substantially C-shaped cross section is fitted into a groove provided on the peripheral side of a lid member that serves as a platen, with the semicircular protrusion facing outward. The hollow part formed inside the annular member has a shape that almost matches the shape of the inner circumferential wall of the annular member, has a notch in a part of the circumference, and is made of metal that can be expanded and contracted. A plurality of leaf spring-like elastic rings such as the above are stacked concentrically with the annular member with their notches offset from each other, and the semicircular protrusion of the annular member that protrudes outward from the groove is connected to the ring. The ring contacts the inner wall of the pail container in an airtight manner supported by the expansion force of the ring, and the contraction and expansion of the opening surface due to the body taper is absorbed by the contraction and expansion of the notch of the ring.

Next, an embodiment of this invention will be described with reference to the drawings.

FIG. 2 is a sectional view showing an embodiment of this invention. In the figure, an annular member 7 made of fluororubber and having a substantially C-shaped cross section is fitted into a groove formed around the side of the heating platen 3 with its semicircular protrusion facing outward. This annular member 7 is an integrally molded product with no seams, and a slight beam allowance 9 is initially provided. Furthermore, fluororubber has excellent heat resistance, so it is suitable for such uses. Inside the annular member 7, plate spring-like elastic rings 8, 8a having a shape that approximately matches the shape of the inner circumferential wall of the annular member 7 are stacked concentrically with the annular member 7. As shown in FIG. 2A, this elastic ring is not in an endless complete ring shape, but has a notch 10 in a part, so it contracts in the circumferential direction. It has a structure that allows for elastic deformation such as expansion and expansion.

Supported by the expansion force of the elastic rings 8, 8a, the annular member 7 is pressed against the inner wall of the pail can 1, thereby acting as a seal. Of course, the annular member also presses against the side walls of the groove to provide a seal therebetween. If only one elastic ring 8 is disposed, the inside of the annular member 7 will be in the notch 1 of the ring 8.
Since there is a risk that the elastic rings 8 and 8a may get stuck and get damaged, it is necessary to stack at least two elastic rings 8, 8a with the cutout portions 10 at slightly different positions. Furthermore, the elastic deformation force can be increased by using a plurality of elastic rings.

When the heating platen 3 equipped with such a sealing device is used for the pail can 1, the platen 3 moves from the top surface to the bottom surface of the pail can 1, and as the taper of the inner wall of the pail becomes stronger, the elastic ring 8, 8a gradually contracts in the notch 10 and presses the annular member 7 against the inner wall of the pail can with elastic force, so that the platen 3 smoothly moves from the top surface to the bottom surface of the pail can 1 while maintaining a sealed state. be able to.

As explained above, according to the sealing device of this invention, it is possible to smoothly lower the platen from the top surface of the pail container to the bottom surface of the pail container in equipment such as hot melt without causing leakage. It has the advantage of being

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of hot melt;
1A is a structural explanatory diagram of the seal 6 in FIG. 1, FIG. 2 is a sectional view showing an embodiment of this invention, and FIG. 2A is an explanatory diagram of the elastic ring in FIG. 2. Code explanation, 1...Pail can, 2...Adhesive, 2
a...Adhesive in molten state, 3...Heating platen,
4...Pump, 5...Arrow, 6...Seal, 61
... Rubber tube, 62 ... Coil spring, 63 ... Hook, 7 ... Annular rubber member with C-shaped cross section, 8, 8a ...
... Elastic ring with a partial notch, 9... Beam allowance, 10... Notch portion.

Claims (1)

[Scope of utility model registration request] When a lid member that covers the opening surface of a bucket-shaped container whose body is tapered so that the area becomes narrower as it approaches the bottom surface moves from the top surface of the container toward the bottom surface, the lid member may be at any position along the way. A sealing device that maintains airtightness between the periphery and the inner wall of the container,
An annular member made of an elastic material having a substantially C-shaped cross section is fitted into a groove provided on the peripheral side of the lid member, with the semicircular protrusion facing outward, and a hollow is formed inside the annular member. A plurality of leaf spring-like elastic rings having a shape that almost matches the shape of the inner circumferential wall of the annular member and having a notch in a part of the circumference and capable of expanding and contracting are arranged in the notch part. are stacked concentrically with the annular member while being shifted from each other, and when the lid member moves from the top surface to the bottom surface, the semicircular protrusion of the annular member that protrudes outward from the groove,
The sealing device is supported by the expansion force of the ring and is in airtight contact with the inner wall of the container, and the reduction and expansion of the opening surface due to the body taper is absorbed by the reduction and expansion of the notch of the ring. .