JPS585050B2 - Membrane body with reinforcing rope holes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a membrane body having a rope hole which has been improved in the way of attaching reinforcing metal fittings, and uses only on-grommets as reinforcing metal fittings, and the rope hole position of the membrane body is The purpose is to provide a membrane body having a rope hole with large tensile strength by providing a cut hole covered with a plurality of tongues by making radial cuts, and by combining the two, automation and reliable eyelet fixing are possible. That is.

In general, ropes and strings are used to assemble and fix membrane structures such as tents and seats, and therefore rope holes reinforced with metal fittings (grommets) are provided at the corners and edges of the membrane.

As shown in FIG. 1, a conventionally widely used reinforcing method is to punch out a circular through hole 3 at the position of the rope hole 2A in the membrane body 1, and insert a pigeon 7 into the through hole 3.
40, the cylindrical part 41 is inserted, the member eyelet 5 is fitted from the opposite side of the membrane body 1, and then the upper part 41a of the cylindrical part of the on-eyelet is expanded and reversed to prevent and tighten the member eyelet 5.

However, in this case, the grommets 5 and 6 are simply attached to the hole 3, and when the rope is hung and pulled, force is applied only to the tension side of the hole 3, causing the portion to tear or deform. It often happens that the eyelet falls off and no longer functions as a rope hole.

Moreover, there is a tendency for the through holes to be made larger in order to facilitate and automate the grommet fixing work, which further exacerbates the above-mentioned drawbacks.

Therefore, the rope hole 2A part is double and triple reinforced with membrane members, and the flange edge 4 of the eyelet is reinforced to prevent it from falling out.
2 has been attempted, but this is time consuming and costly and has little effect.

Furthermore, punching waste tends to get caught in the punching tool, resulting in poor punching, so automation of hole-drilling and eyelet-locking tends to cause problems in the process.

Therefore, in place of the conventional through-hole, the present inventor created a cut hole 7 approximately equal to the outer diameter of the on-eyelet cylindrical portion 41 by making radial cuts 6 at the position of the rope hole as shown in FIG.
The cut hole 7 is covered with a plurality of tongue pieces 8..., and the tongue pieces 8... and the cut hole peripheral part 9 are inserted between the on-eyelet 4 and the member eyelet 5 as shown in FIG. It was proposed that the rope hole 2B be formed by bending, winding and crimping.

However, the illustrated one is formed by inserting the on-eyelet cylindrical portion 41 into the cut hole 7 with each tongue piece 8 bent toward the rim side of the on-eyelet 4.

In this way, the eyelet 4.5 is attached to the tongue piece 8 and the notch hole periphery 9.
Since it is attached to the membrane body 1 with the rope wrapped around it, the attachment is more solid than conventional ones, and when the rope is used, the rope hole 2B is prevented from being subjected to unbalanced force or deformed, causing the eyelet to come off. This allows for sufficient reinforcement of the rope hole.

However, in this improved product, the inner peripheral edge 5a of the member eyelet 5 prevents the tongue piece 8 and the hole periphery 9 from being sufficiently rolled into the on-eyelet cylindrical portion 41, and the on-eyelet flange 42 and member Tongue piece 8 and hole periphery 9 between 5
The clamping and fixing of the parts may also be insufficient.

Furthermore, in order to automate the eyelet fixing, it is necessary to supply the on-eyelet 4 and the member eyelet 5 separately, which makes the apparatus complicated.

Further, it is necessary to prepare member fasteners 5 having various inner diameters depending on the thickness and number of membrane members 1.

The present inventor completed the present invention through further research in order to eliminate the drawbacks of the above-mentioned incision ceremony.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 4 is a longitudinal cross-sectional view of the rope hole 20 portion according to the present invention, which shows the cut hole 1 provided at the rope hole position of the membrane body 1 (FIG. 2) in the same way as the rope hole 2B (FIG. 3). Onhato 74
Upper part 41a of the cylindrical part after inserting the 0 cylindrical part 41 and expanding and inverting it
and the upper part of the cylindrical part and the cylindrical part 41. The on-eyelet 4 is fixed onto the membrane body 1 by winding and tightening the tongue pieces 8 and the cut hole peripheral part 9 between the flange parts 42.

In this case, unlike the rope hole 2B, the member eyelet 5 is not used, so that the expansion inversion and pressing deformation of the upper part 41a of the eyelet cylindrical portion are sufficiently performed, and the gap between the portion 41a and the flange portion 42 of the eyelet and the cylindrical portion 41 is sufficiently performed. Tongue piece 8...
- The peripheral edge 9 of the cut hole is sufficiently clamped, and the tongue piece 8, especially its base 8a, and the peripheral edge 90 of the hole are sufficiently wrapped around the upper part 41a of the cylindrical portion, and the eyelet is more completely fixed. Become.

Similarly, in the above embodiment, as shown in FIG.
However, when using the on-eyelet 4 [FIG. 5b] which has a narrow flange edge 42' excluding the flat outer ring 42a of the on-eyelet flange 42, The upper part 41 of the cylindrical part is expanded and reversed as shown in the figure.
'a' completely fits into the flange edge 42', and the membrane body 1 is more firmly held in this part.

Furthermore, this on-eyelet 4' is smaller due to the lack of an outer ring, which reduces the cost, and since it can be installed at the very edge of the outer edge of the membrane 1 as shown in FIG. The tension force of the rope 11 applied to the inner periphery of the cylindrical portion 41', that is, the rope hole 2, is applied to the outer edge reinforcing rope 10, and the tension force can be dispersed.

Similarly, it is preferable to increase the height of any eyelet when the membrane is thick or when multiple layers are stacked.

Next, the above-mentioned reinforcing rope hole 2C [2C'
The same applies to the case of], by manually hitting the upper part 41a of the cylindrical part of the eyelet 4 inserted into the notch hole 7 in the state shown in Fig. 8 with a punch (path shown) to expand and invert it.
Products such as those shown in FIGS. 4 and 6 can be easily made.

Further, when the eyelet 4 is inserted and fixed in the state shown in FIG. 8, a reinforcing rope hole 2D as shown in FIG. 9 is finished.

This reinforcing rope hole 2D protrudes from the upper part 41a of the eyelet cylindrical part where the tongue piece 8 is expanded and reversed, and the appearance is poor, but it is easy to make by hand with a punch.

On the other hand, in the case of the method shown in FIG. 8, the cutting and eyelet fixing can be performed continuously and automatically using a device as shown in FIG.

This caulking device 20 has a circular hole 22 in a surface plate 21 on which the membrane body 1 is placed, and accommodates cylindrical eyelet supports 23 that slide vertically in the circular hole 22, each independently above the circular hole. A membrane presser 24 and a guide rod 25 are arranged to move up and down.

Then, the guide rod is lowered while making radial cuts in the membrane body 1 with the blade 251 at the tip of the guide rod 25, and at the same time, the eyelet support 23 is raised and the on-eyelet cylindrical portion 41 is lowered.
is inserted between the guide rod 25 and the downward facing tongue piece 8..., and then the upper part 41a of the cylindrical part is expanded and reversed using the caulking groove 252 on the upper part of the guide rod, as shown in FIGS. 4 and 6. Rope holes 2C and 2C' are obtained.

According to this device, the cuts 6 are shorter than the outer diameter of the on-eyelet cylindrical portion 41, so that when the on-eyelet is inserted, the base of the tongue piece 8 and the peripheral edge 9 of the notch hole connected thereto are in close contact with each other according to the on-eyelet cylindrical portion 41. The upper part 41a of the eyelet cylindrical part is raised, expanded and reversed, and is sufficiently wound and fixed.

In addition, the tip of each tongue piece 8 is bent toward the edge of the eyelet flange, so it is not visible from the outside and has a beautiful finish.
The cutting and eyelet fixing can be performed continuously in one step, and the eyelet reinforcement of the rope hole can be performed extremely easily.

Reinforcement rope holes 2C, 2C', 2 obtained in this way
D is that when a tensile strength test is carried out, as shown in FIG.
As shown in the figure, a tension S occurs that concentrates at the point P1 where the rope 11 hangs, causing the portion P1 to break or the eyelet to come off the hole.

On the other hand, in the case of the product of the present invention, the middle part P of the test piece T
However, the force required to do so is three times or more than that of conventional products, and provides sufficient strength even for thin membranes.

This is larger than the conventional product in which 3 to 5 pieces of reinforcing cloth are inserted, and in the case of the product of the present invention, reinforcement is not necessary or it is sufficient to use one piece of reinforcing cloth.

Similarly, in the case where rope holes 2C are provided in two stacked sheets as shown in Fig. 12, the force required to separate the two sheets is more than twice that of the conventional product, and the product of the present invention is extremely strong in terms of strength. Show excellence.

In addition, the reinforcing rope holes 2C, 2C', and 2D according to the present invention are
Tents and sheets, such as awning tents, camping tents,
In addition to military seats, jeep canopies, and large tent structures for warehouses, it can also be applied to rucksacks, backpacks, shoes, footwear, and personal items using rope, and reinforced plastic sheets are not limited to canvas materials. It can be used extensively with leather.

It is particularly preferable for backpacks and the like that require light weight and strength.

As described above, the reinforcing rope hole according to the present invention uses only the eyelet as a reinforcing metal fitting, and the upper part of the cylindrical eyelet of the eyelet inserted into the cut hole provided at the rope hole position of the membrane body.
A rope hole is formed by enlarging and inverting the tongue piece and the peripheral edge of the cut hole, and then tightening the expanded and inverted part, other parts of the cylindrical part, and the flange edge in a membrane-like manner. .

Therefore, (1) it is lightweight and cost-effective because it does not use a member eyelet, and if the rim of the eyelet itself is made narrow, it becomes even cheaper.

■Since there is no member eyelet, the tongue piece and the periphery of the notched hole can be sufficiently wrapped around and tightened to the on-eyelet, resulting in reliable installation and excellent strength.

■The notch hole can be formed and the eyelet can be fixed at the same time, and the tongue piece created by the notch can be used as it is for reinforcement.
Unlike in the case of through-holes, there is no problem with eyelet closure, and rope hole formation can be easily automated and made continuous.

Therefore, the rope hole forming process, which is a major bottleneck in the conventional process, can be streamlined and speeded up, resulting in a significant cost reduction, which is extremely meaningful from a practical standpoint.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a rope hole formed by a conventional through-hole, Fig. 2 is a plan view showing a cut hole in a membrane body according to the present invention, and Fig. 3 is a view of a rope hole formed by a cut hole using both on-men eyelets. 4 is a longitudinal sectional view of the rope hole according to the present invention, and FIG. 5 is a longitudinal sectional view of the eyelet, in which a shows a conventional product and b shows an improved product without an outer ring at the flange edge. FIG. 6 is a longitudinal sectional view of a rope hole showing another example according to the present invention, FIG. 7 is a plan view of another embodiment, and FIG. 8 aeb is a longitudinal sectional view showing how to insert the eyelet into the membrane body. 9 is a longitudinal sectional view of the rope hole formed according to FIG. 8a, and FIG. 10 is a schematic longitudinal sectional view of the apparatus for forming the rope hole according to the present invention.
FIG. 11 and FIG. 12 are explanatory diagrams showing a method for measuring tensile strength. 1... Membrane body, 2C, 2C', 2D... Reinforcement rope hole according to the present invention, 4, 4'... On eyelet, 41, 41
'... On eyelet cylindrical part, 41a, 41'a... On no eyelet cylindrical part upper part, 42, 42'... On eyelet flange edge, 42a, 42'a... On eyelet flange edge outer ring, 5 ...Member tome, 6...Radial cut, 7...
- Cut hole, 8... tongue piece, 9... cut hole periphery.

Claims (1)

[Scope of Claims] 1. A cut hole approximately equal to the outer diameter of the cylindrical part of the eyelet and a plurality of tongue pieces covering the cut hole are formed by radial cuts at the rope hole attachment position of the membrane body, and a plurality of tongue pieces covering the cut hole are formed by radial cuts. Each tongue piece is bent along the outer periphery of the on eyelet inserted into the cut hole so that the part becomes the rope insertion part, and the cylindrical upper part and/or the cylindrical upper part where the on eye toe is expanded and inverted, with the peripheral edge of the cut hole being bent along the outer periphery of the on eyelet. A membrane body having a reinforcing rope hole, characterized in that the eyelet is fixed on the membrane body by being wound and clamped between the rim and the rim. 2. A membrane body having a reinforcing rope hole according to claim 1, wherein each tongue piece is bent toward the rim side of the eyelet. 3. A membrane body having a reinforcing rope hole according to claim 1 or 2, wherein a narrow eyelet is used as the eyelet, excluding the flat outer ring at the flange edge.