JPS6149020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for fitting a metal lid to a container mouth provided on a top plate or the like of a can or a container similar to a can.

As a means of fitting a metal lid to the container mouth,
As shown in the vertical cross-sectional view in FIG. 3
A peripheral wall part 6 having a folded part 5 which is overlapped with the folded part 5 is provided, and a sealing compound 7 is applied to the back surface of the folded part 5. 5 are brought into close contact with each other, a large number of claw pieces 8 arranged in an annular manner are inserted into the inner side of the peripheral wall 6 of the metal lid 4, and the cam protrusion 9 formed at the lower part of the back side of these claw pieces 8 is inserted into the second As shown in the longitudinal cross-sectional view in the figure, the lower end of the center rod 10 to be rolled down is pressed to displace the lower part of the claw piece 8, which had been drawn toward the center by the annular coil spring 11, outward. , by expanding the diameter of the peripheral wall 6 in a horizontal radial manner and extending it below the top plate 1,
There is a means to prevent the metal lid 4 from coming off, and at the same time to make it completely airtight and liquid-tight using a sealing compound 7.

When fitting the metal lid 4 to the container mouth in this manner, before the diameter expansion of the peripheral wall 6 by the claw pieces 8 begins, the lower end of the cylindrical frame 12 supporting the claw pieces 8 in an annular arrangement The folded part 5 of the metal lid 4 stacked on the curled part 3 is pressed down from above by the curved concave surface 13 of the curved concave surface 13 of If a large tensile force is applied and the frame 12 is only pressed from above by the curved concave surface 13, when the claw piece 8 comes into pressure contact with the peripheral wall part 6, the folded part 5 will slip as the plastic working progresses, and as shown in FIG. As shown, the tip of the folded portion 5 moves considerably upward. Due to this sliding of the folded part 5, the sealing compound 7 applied to the back surface is applied to the curled part at a position deviated from the fixed position of contact with the upper surface of the curled part 3 in the direction of the inner peripheral surface of the container mouth wall part 2. It will come into contact with 3. Therefore, the upper part of the folded part 5, which is curved at a predetermined radius, overlaps the vertical surface of the container mouth wall part 2, and the curved part plastically worked is stretched flat.

However, once the folded part 5 has been plastically worked by pressing, it will not be possible to accurately follow the curled part 3 if it is misaligned, and since the sealing compound 7 is applied to the back side, the folded part 5 will not be able to spread even further. is difficult, and when the diameter of the peripheral wall portion 6 is expanded,
There was also a risk that the sealing compound 7 would float up from the curled portion 3.

Furthermore, even if the above-mentioned abnormality does not occur in the sealing compound, the sealing compound that exists between the folded part of the metal lid and the curled part of the container mouth wall may be exposed to low temperature atmosphere such as in a freezer. It hardens, compressive stress increases, and sealing ability decreases significantly.

By the way, this type of container with a metal lid is often used to store food, such as concentrated juices or egg yolks, which are the raw material for mayonnaise.
Store it in the freezer, but as mentioned above, some of the sealing compound 7 may have floated,
Even if the container is not floating, it hardens due to low temperatures and its sealing ability is reduced, and even if the container is sealed in a vacuum, outside air may enter the container, causing a pseudo-expansion phenomenon.

In view of these circumstances, the present invention has been developed to securely fit a metal lid onto a container opening, and to firmly tighten the metal lid so as not to change the sealing ability of the sealing compound between the fitted metal lid and the container opening. This device provides a metal lid fitting device that allows the folded part of the metal lid to be placed over the curled part at the top of the container mouth wall from the outside.
After tightening along the outer lower half of the curled portion, an annular array of outer claws and inner claws are provided to expand the diameter of the metal lid peripheral wall, and both claw groups allow plastic working from two directions. It was designed so that it could be used freely.

An embodiment of the metal lid fitting device of the present invention will be described with reference to FIGS. 3 to 16.

3 to 10 are drawings related to the first embodiment of the device of the present invention, and FIG. 3 shows the first embodiment of the device of the present invention.
The embodiment is shown in longitudinal section in the left half in an activated state and in the right half in an inactive state. As shown in the drawings, this embodiment is an example of a device in which a metal lid fitting operation is obtained by manually lowering a pair of left and right levers 14, 14.

The levers 14, 14 are each supported by a horizontal support shaft 17 on an upward supporting wall 16 integral with the frame 15 so as to be able to rise and fall freely.

FIG. 4 is a plan view of this embodiment with the rod portion 14A of the lever 14 removed, and as can be seen from this FIG.
The support shaft 17, which passes through the shaft, is supported on both sides.

The frame 15 is made up of an upper member 18, a middle member 19, and a lower member 20, all of which are annular members, assembled together by bolts 21, as partially shown in a vertical cross-sectional side view in FIG.

The upper member 18 of the frame 15 has a downwardly directed annular outer wall 18A, and has a downwardly directed hub 22 in the center.

As partially shown in a plan view in FIG. 6, the middle member 19 has slit-like grooves 23 arranged at equal intervals.
is provided at the top, while the lower end of the outer periphery extends outward and downward over the entire circumference, and this projecting portion 24
is provided to support a notch 26 provided on the inner surface of the outer claw piece 25.

The slit-like groove portion 23 is formed on the outer wall 1 of the upper member 18.
It is provided to support the head 28 of the inner claw piece 27 on the inside of 8A.

As shown in an enlarged perspective view in FIG. 7, the outer claw piece 25 has the notch 26 provided on its inner surface, and the lower end of the inner surface is formed on the outer side 25A. Furthermore, a notch 30 into which the annular coil spring 29 is fitted is provided on the upper part of the outer side, and a cam convex part 3 is provided on the lower part of the outer side.
1.

The outer claw piece 25 is a downwardly facing peripheral wall 3 of a cylindrical cap-shaped body 32 fitted from above to the outside of the frame 15.
A predetermined number of notches 26 are arranged in an annular shape within an annular gap formed by the inner peripheral surface of the frame 15 and the outer peripheral surfaces of the middle member 19 and the lower member 20 of the frame 15. Since the annular coil spring 29 is engaged with the notch 30 in the latched state, the lower end, that is, the outer claw 25A, has a tendency to always move outward from the lower end of the lower member 20 of the frame 15 using the overhang 24 as a fulcrum. It is given.

Therefore, as shown in the right half of FIG. The outer pawls 25A swing outward all at once.

As shown in the left half of FIG. 3, the outer claw pieces 25 are pressed down by the cylindrical cap-shaped body 32, and when the lower end of the peripheral wall 32A of the cylindrical cap-shaped body 32 presses the cam convex portion 31, The lower end, that is, the outer claw 25A, swings in the direction toward the lower end of the lower member 20 of the frame 15. This swing limit, that is, the outer claw 25
The limit of the forward movement of A toward the center is determined at the time of design by the protrusion height of the cam convex portion 31A and the fulcrum position.

As shown in the enlarged perspective view in FIG. 8, the inner claw piece 27 has a head 28 projecting forward, an outer lower part forming an inner claw 27A, and an inclined cam part extending from the inner lower part toward the lower end. 33. Furthermore, a notch 34 is provided on the outside slightly above the inner claw 27A. This notch is a notch into which the annular coil spring 35 is fitted.

The upper half of the inner claw piece 27 faces the gap formed between the outer circumferential surface of the hub 22 of the frame 15 and the inner circumferential surface of the middle member 19, and is centered on the head 28 inserted into the slit-shaped groove 23. lower end, i.e. inner claw 2
7A is incorporated so that it can swing inward and outward.
Furthermore, since it is tightened by the annular coil spring 35, the center rod 36, which has a tendency to always gather inward and which runs longitudinally through the hub 22 of the frame 15, is pushed down, so that the lower large diameter portion of the center rod is pulled down. The cam protrusion 33 is pushed by 36A and is displaced outward.

The center rod 36 is integrally fixed to the cylindrical cap-shaped body 32, and when the lever 14 is lowered around the support shaft 17, the roller 37 of the lever base 14B pushes the cylindrical top 32B, so that the central rod 36 is shaped into a cylindrical shape. Cap-shaped body 32
It is also compressed.

The central rod 36 and the cylindrical cap-shaped body 32 are lowered against the elastic upward force of the compression spring 38 provided between the hub 22 of the frame 15 and the cylindrical cap-shaped body 32.

The center rod 36 and the cylindrical cap-shaped body 32 are connected to the outer side before the large diameter portion 36A of the center rod 36 pushes the inclined cam portion 33 of the inner claw piece 27 and causes the inner claw 27A to expand the diameter of the metal lid. Cam protrusion 31 of claw piece 25
The mutual dimensions and height positional relationship are determined so that the lower end of the peripheral wall 32A of the cylindrical cap-shaped body 32 presses the outer claw 25A to plastically work the folded portion of the metal lid. That is, the action starting point for operating the outer claw group by the cylindrical cap-shaped body 32 is set higher than the action starting point for operating the inner claw group by the central rod. Although this dimension is determined at the time of design, further minute stroke adjustments may be required during use. In this case, the height position of the head 21A of the bolt 21 shown in FIG. 5 will be adjusted. The height of the head 21A of the bolt 21 is determined by the height of the bolt head insertion recess 3 provided in the upper member 18.
This can be achieved by replacing the adjustment washer 40 inserted in the bolt head 9 so as to abut against the lower surface of the bolt head with one of a different thickness. In addition, the bolt head 21A
shall always protrude above the upper member 18, and the number of bolts 21 used shall be at least four, and two of them are such that the rollers 37, 37 of the levers 14, 14 are connected to the cylindrical cap-shaped body 32. Top 32
It is desirable to press B, that is, between the pair of support walls 16, 16 that support the support shaft 17.

The inner and outer claws 27A and 25A operate as described above, but just before these inner and outer claws operate, the lower end of the lower member 20 of the frame 15 presses the top of the folded portion of the metal lid. Therefore, the lower member 2
0 is formed into a curved concave surface 20A that is in close contact with the curved surface of the folded portion of the metal lid peripheral wall.

In this embodiment, the roller 3 attached to the lever 14
7 to lower the cylindrical cap-shaped body 32, but the roller 37 is lowered by the base 14B of the lever 14.
Of course, it is also possible to use a cam integrated with the cam.

FIGS. 9 and 10 are enlarged vertical cross-sectional views of essential parts of the metal lid fitting process using the apparatus of the present invention.

Figure 9 shows the state just before the start of plastic working.
Figure 0 shows the state immediately after plastic working is completed.

As shown in FIG. 9, the preparatory work for the conventional device is that the folded part 5 of the metal lid 4 is overlapped on the curled part 3 of the upper part of the container mouth wall 2 provided in a part of the container 1. It's the same. Also, metal lid 4
The folded part 5 is formed on the upper part of the peripheral wall part 6, and the sealing compound 7 is applied to the back surface of the folded part 5, which is the same as a metal lid that is fitted by a conventional device. is formed to be long so that when it is stacked on the curled portion 3, the tip comes as close to the top surface of the top plate 1 as possible.

In the state shown in the right half of FIG.
As shown in the figure, when the curved concave surface 20A of the lower member 20 of the frame 15 comes into contact with the upper surface of the semicircular curved part of the folded part 5 of the metal lid 4 which is stacked on the curled part 3, the outer claw 25A The inner claw 27A faces the outside of the folded part 5 facing the outer lower half of the metal lid 4 so as to surround it, and the inner claw 27A is attached to the lower half of the peripheral wall 6 of the metal lid 4 located below the lower end of the container mouth wall 2. Facing the inside of the part.

When the left and right levers 14 are tilted outward from the state shown in the right half of FIG. 3 and FIG. 9, they rotate about the support shaft 17 as shown in the left half of FIG. The roller 37 supported at an eccentric position on the base 14B of the moved lever 14 pushes the top 32B of the cylindrical cap-shaped body 32 which is elastically supported by a compression spring 38, and the cylindrical cap-shaped body 32 And the central rod 36 that is integrated with this will be pressed down.

As the cylindrical cap-shaped body 32 and the center rod 36 descend, the tip of the cylindrical cap-shaped body 32 first pushes the cam protrusion 31 of the outer claw piece 25 inward, and then the inner claw piece 27
The large diameter portion 36A of the center rod 36 pushes the inclined cam portion 33 outward. As a result of this operation, the folded part 5 is plastically worked as shown in FIG. The diameter is expanded from the lower end of the wall 2 to below the top plate 1.

As described above, the device of the present invention has the outer claw 2
5A, the folded part 5 is brought into close contact with the outer lower half of the curled part, pressed down, this state is maintained, and the diameter of the peripheral wall part 6 is expanded. During this time, the curved concave surface of the lower end of the lower member 20 of the frame 15 is 20A presses the folded part 5 from above, so when the fitting is completed, the sealing compound 7 is extremely strongly tightened at the correct position on the curled part 3, and the sealing performance is good. Therefore, even if it is placed in a low-temperature atmosphere, there is no risk of creating any gaps through which outside air can circulate.

Next, a second embodiment shown in FIGS. 11 to 16 will be described.

This second embodiment is exactly the same as the first embodiment in that the folded portion of the metal lid is plastically worked by the inner and outer claw groups, but the drive mechanism for driving the inner and outer claw groups is of a pneumatic type. It is a device.

FIG. 11 shows a second embodiment of the apparatus of the present invention, with the right half showing a longitudinal cross-sectional view of the state immediately before the start of plastic working, and the left half showing a longitudinal cross-sectional view of the state immediately after the plastic working has ended. be. The symbols used in the explanation are:
The same reference numerals are used for the same members as in the first embodiment.

As shown in the drawing, the frame 15 has four
Air cylinder 42 via book columnar connecting member 41
is installed. This air cylinder 42 has three pistons 43 housed inside a cylinder body 42A at a predetermined interval.

The piston 43 is shown in plan view in FIG.
As shown in a half longitudinal side view in FIG. 3, it is a disk body with a concentric ring-shaped recess 44 on its upper surface, and a hole 46 through which a piston rod 45 is inserted in the center. The three pistons 43 are the piston rod 4
They are assembled by fitting the hole 46 into the small diameter portion 45A of No. 5, and maintain a predetermined distance from each other by a collar 47 serving as a spacer. Furthermore, each piston 4
3, a boss 48 is formed around the hole 46, and a groove 49 communicating from the recess 44 to the hole 46 is formed in the boss 48 of the lower pistons 43 except for the uppermost piston 43. Further, an O-ring-shaped seal ring 5 is provided on the outer periphery of each piston 43.
0 is attached.

On the other hand, the inside of the cylinder body 42A has three cylinder chambers A, B,
It is divided into C.

The annular disc 51 has its outer peripheral surface brought into close contact with the inner peripheral surface of the cylinder body 42A, and its inner peripheral surface is brought into close contact with the upper part of the outer peripheral surface of the collar 47 via an O-ring shaped seal ring 52.

The interval between the annular disks 51 is such that the outer peripheral surface is the cylinder body 42.
It is held by a collar 53 that is assembled so that the outer circumferential surface is in close contact with the inner circumferential surface of A.

The collar 53 also serves as a cylinder liner, and the seal ring 50 of the piston 43 is in contact with the inner peripheral surface.

An air passage 54 is provided in a part of the side wall of the cylinder body 42A.

The air passage 54 opens to the lowest cylinder chamber C at the inner bottom surface of the cylinder body 42A, and opens to the upper cylinder chambers A and B through the air passage 55 provided in the annular disks 51 and 51 to the inner bottom surface of each cylinder chamber. It is open to

The air passage 54 is connected to an air supply passage 57 via a spool valve 56 provided at the upper part of the cylinder body 42A.

The spool valve 56 has a port 58 communicating with the air passage 54, a port 60 communicating with an air passage 59 opening on the ceiling surface of the cylinder chamber A, and a port 61 communicating with the air supply passage 57.

A valve 62 inserted into the spool valve body 56A provided with ports 58, 60, and 61 is connected to the trigger 6.
When the cam 64, which is displaced by the operation in step 3, moves forward and descends against the elastic pressing force of the spring 65, the ports 61 and 60 are communicated with each other, and when the trigger 63 is not operated, the cam 64 is in the retracted position. Since it is in the upper position, it is kept in the raised position, and ports 61 and 58 are communicated with each other.

The valve 62 has O-ring-shaped seal rings 66, 66 attached at two upper and lower locations, and has an exhaust hole 67 that opens above the upper seal ring 66 and at the lower end surface.

The exhaust hole 67 communicates with the atmosphere via an exhaust path 68 provided at the top of the cylinder body 42A.

A ventilation passage 69 is provided in the piston rod 45 whose upper end faces the cylinder chamber A into which the air passage 59 opens.

The ventilation passage 69 is the groove 49 of the lower two pistons 43.
Holes 70, 7 of the piston rod small diameter portion 45A facing the
It communicates with cylinder chambers B and C through 0.

A center rod 71 is provided at the lower end of the piston rod 45.
are fixed by tightening bolts 72.

The piston rod 45 and the center rod 71 sandwich the cylinder 32, and these three members move up and down together.

The frame 15 that supports the outer claw pieces 25 and the inner claw pieces 27 is connected to the upper member 18, the middle member 19, and the lower member 20.
This is the same as the first embodiment in that the annular coil springs 29 and 35 are used to impart an opening behavior to the outer claw pieces 25 group and the inner claw pieces 27 group, respectively.

As shown in plan view in FIG. 14, the cylinder 32 has a hole 73 through which the connecting member 41 is inserted, and a center hole 74 into which the lower end of the piston rod 45 is fitted, at the top 32B.

Further, as shown in a plan view in FIG. 15, four connecting members 41 are provided upright on the upper member 18 of the frame 15, and bolts used for assembling the frame 15 as shown in a vertical cross-sectional view in FIG. Hole 7 through which 21 is inserted
5 is also drilled.

In addition, a notch 26 is provided in the outer claw piece 25, and this cutout is engaged with a protruding portion 24 provided over the entire outer circumference of the lower end of the middle member 19 of the frame 15 to serve as a swinging fulcrum, and the inner claw piece The second embodiment is also the same as the first embodiment in that the head 28 of the second embodiment is engaged with the notch 23 on the upper surface of the middle member 19 to serve as a swinging fulcrum.

In the second embodiment having the above-described configuration, the trigger 63
When the cam 64 is moved forward by operating the cam 64 with a fingertip, the valve 62 of the spool valve 56 is depressed and the ports 61 and 60 are communicated with each other. As a result, the piston 43 is simultaneously depressed and becomes the state shown in the left half of Fig. 11. , the cylindrical cap-shaped body 32 and the central rod 71 integrated with the piston rod 45 are pressed down, and plastic working is performed on the folded portion 5 and the peripheral wall portion 6 of the metal lid 4 by the outer claw 25A and the inner claw 27A. Become.

When you release your finger from the trigger 63, the cam 64 returns to its old state and the valve 62 rises, so ports 61 and 58
are in communication, pressurized air is supplied to the lower surface side of the pistons 43, and the pistons 43 are pushed up all at once. At this time, the pressurized air that had previously entered the cylinder chambers A, B, and C above the piston 43 is discharged from the port 60 of the spool valve 56 to the exhaust path 68.
is dissipated into the atmosphere through In this state, the outer claw 25A and the inner claw 27A are each retracted,
The arrangement is such that the outer side of the folded part 5 of the metal lid 4 superimposed on the curled part 3 of the container mouth wall 2 and the peripheral wall part 6 can be respectively faced.

As is clear from the above description, the device of the present invention makes the related structure of each part and member solid, allows the operation of the outer claw group and the inner claw group to operate in a timely and reliable manner, and Prior to the expansion of the diameter of the metal lid peripheral wall by the group, the metal lid folded part is plastically processed by the outer claw group, and the tip of the folded part is brought into close contact with the outer lower part of the curled part of the container opening wall, thereby preventing slippage when fitting. It is an excellent product that can be used to fit metal lids without the risk of the sealing compound curing and reducing the sealing ability even when stored in a low-temperature atmosphere such as a freezer. has advantages.

[Brief explanation of the drawing]

Figures 1 and 2 are vertical sectional views illustrating the conventional process of fitting a metal lid onto a container mouth, Figures 3 to 10 show a first embodiment of the device of the present invention, and Figure 3 is a right-hand side view. A longitudinal cross-sectional view showing the inactive state in one half and the operating state in the left half, Figure 4 is a plan view with the lever rod removed, and Figure 5 shows part of the frame and cylinder. 6 is a plan view showing a part of the inner member of the frame, FIG. 7 is an enlarged perspective view of the outer claw piece, FIG. 8 is an enlarged perspective view of the inner claw piece, and FIGS. 10
Figures a and b are longitudinal cross-sectional views illustrating the metal lid fitting process using the device of the present invention, Figures 11 to 16 show the second embodiment, and Figure 11 shows the inactive state in the right half.
Also, the left half is a vertical sectional view showing the operating state, FIG. 12 is a plan view of the piston of the air cylinder, FIG. 13 is a vertical sectional side view of the piston half, and
4 is a plan view of the cylindrical cap-like body, FIG. 15 is a plan view of the frame, and FIG. 16 is a longitudinal sectional view showing a part of the frame and the cylindrical cap-like body. DESCRIPTION OF SYMBOLS 1...Top plate, 2...Container mouth wall, 3...Curl part, 4...Metal lid, 5...Folded part, 6...Peripheral wall part, 7...Sealing compound, 14...Lever, 15... ...Frame, 17...Spindle, 18...
...Upper member, 19...Middle member, 20...Lower member, 2
DESCRIPTION OF SYMBOLS 1... Bolt, 22... Hub, 23... Slit-shaped groove part, 24... Projection part, 25... Outer claw piece, 2
5A...Outer claw, 26...Notch, 27...Inner claw piece, 27A...Inner claw, 28...Head, 29...
Annular coil spring, 31... cam convex part, 32... cylindrical cap-shaped body, 32A... peripheral wall, 32B... top part,
33... Inclined cam portion, 34... Notch, 35... Annular coil spring, 36... Center rod, 36A... Large diameter portion, 37... Roller, 38... Compression spring, 41...
...Connection member, 42...Air cylinder, 42A...
Air cylinder body, 43... Piston, 45...
Piston rod, 47... Collar, 51... Annular disc, 53... Collar, 54, 55... Air passage,
56...Spool valve, 57...Air supply path, 58,6
0, 61...Port, 62...Valve, 63...Trigger, 67...Exhaust hole, 68...Exhaust path, 69...
Ventilation passage, 71...center rod.

Claims (1)

[Claims] 1. A lower large-diameter portion is formed on a central rod fixed to the center of a cylindrical cap-shaped body, and an upper member having a downwardly directed hub at the center within the cylindrical cap-shaped body, and a plurality of slits arranged at equal intervals. The peripheral wall of the cylindrical cap-shaped body is provided with a frame consisting of a middle member having a shaped groove part at the top and a protruding part in which the lower end of the outer periphery extends outward and downward over the entire circumference, and a lower member. a group of outer claw pieces having a notch hooked to the overhang and having a cam protrusion at the lower part are arranged in an annular manner within an annular gap formed by the inner circumferential surface and the outer circumferential surfaces of the middle member and the lower member of the frame; An inner claw whose upper half faces the gap formed by the outer circumferential surface of the hub of the upper member of the frame and the inner circumferential surface of the middle member, whose head is inserted into the slit-shaped groove of the middle member, and which has an inclined cam portion at the bottom. The groups of pieces are arranged in a ring, and the cylindrical cap-like body is lowered to operate the outer claw pieces through the cam convex part, and then the center rod is lowered and the inner claw pieces are activated by the lower large diameter part via the inclined cam part. A drive mechanism is provided to operate the group, and the inner claw group expands the surrounding wall while the outer claw group brings the folded part of the metal lid peripheral wall into close contact with the outer lower half of the curled portion of the upper part of the container opening wall. A metal lid fitting device characterized in that the metal lid fitting device has a diameter.