KR20020076282A - Flexible seal for a cable through hole - Google Patents

Abstract

The present invention relates to a flexible seal for a cable through hole, mounted in an opening in the wall. The seal includes a seal collar and lock shoulder sealingly receiving a wall between the edges of the opening, and a tapered portion between the first and second ends and between the first and second ends. The tapered portion 3 comprises an outer surface 13, a wide end 5, and a narrow part provided with a bead 10, in which the bead 10 provides a pull-off from the first position. It can be rotated to the locked position, in which the seal seals the cable sealingly. In order to easily mount the seal without tools and to allow efficient pull-off, the bead 10 is in the narrow portion 4 region of the tapered portion 3 and the grip shoulder 12 protruding on the outer surface 13 of the tapered portion. To form.

Description

FLEXIBLE SEAL FOR A CABLE THROUGH HOLE}

Finnish patent 60797 discloses a flexible seal of the type described above. One end of the seal is provided with a bead that provides a pulloff by clouding towards the tip. Pull-off refers to the characteristics of a seal that prevents the cable mounted within the seal from slipping through the seal.

A problem with known flexible seals is that they are difficult to mount in walls. It is difficult to push the seal into the wall so that the tapered portion of the seal is inserted deep enough through the hole so that the seal is properly and sealably placed. The seal needs to be compressed with great force from one side that is pushed into the opening. The significantly inclined taper does not actually make it easier to mount by being pulled into place at the same time as the seal is mounted. The seal must be pressed from the other sides in order for the mounting to be successful.

Rigid, plastic, threaded two-piece seals are known, and mounting them is easy but slow. Because of the structure, these are more expensive. They provide efficient pull off.

The present invention relates to a flexible seal for a cable through hole to be mounted in a wall, in particular in an opening in an electrical and electronic shielding wall. The seal includes a seal collar and locking shoulder to seal the wall sealingly between the edges of the opening, and first and second ends and taper portions between the first and second ends. The tapered portion includes an outer surface, a wide end, and a narrow portion, and the narrow portion of the tapered portion can rotate from the first position to a locked position closer to the first end of the seal to provide a full-off. Bead is provided. In the locked position the seal seals the cable. Cable herein refers to an electrical conductor, but in particular refers to a conductor having a perimeter sheath and generally comprising a plurality of conductors. In the context, the expression 'locking shoulder' also includes a locking means in the form of a protrusion.

Said seals are used when the openings in the walls, the so-called through holes, need to be sealed. The cable runs through the opening in this wall.

The invention will now be described in more detail with reference to two preferred embodiments and the accompanying drawings.

1 is a side view of the seal.

2 and 3 show the seal from the opposite end.

4 is a cross-sectional view taken along line IV-IV of FIG.

5 shows how the seal is mounted.

6 and 7 show the seal in two different operating positions.

8 is a sectional view of a second embodiment of a seal.

It is an object of the present invention to provide a novel flexible seal for cable through holes without the above disadvantages. To this end, the seal is characterized in that the beads are in the narrow region of the tapered portion and form a protruding gripping shoulder on the outer surface of the tapered portion to facilitate pushing the seal into place in the wall. The grip shoulders formed by the beads make the mounting of the seal fairly easy.

The beads are preferably formed at points that are very close to the first end of the seal at the narrow seal end. In this way the seal is made small and short, which is important when the seal is used for shielding. This is because there is not much empty space inside the shield and it is advantageous that the seal does not occupy as much space as possible inside the shield.

The bead is preferably an annular member, which makes it easy to grip and pull the grip shoulder with a finger. Since the tapered portion adjacent the beads is preferably made of thin material, the beads can be bent inward toward the locked position close to the first end of the seal. In this way, the beads press against the cable surface, and the distance X from the first end of the seal is shorter than the distance Y from the outer surface of the transition point between the wide end and the narrow end of the tapered portion to the first end of the seal. When the bead bent to the locked position presses against the cable surface, a large friction force is generated between the bead and the cable sheath, effectively preventing the cable from being pulled through the hole, the seal. By doing so, the beads provide efficient pull off.

According to a preferred embodiment of the present invention, the tapered portion includes one clamping surface for receiving the fastening member at its narrow end and reliably pressing the seal against the cable. Large compressive forces can be generated, for example, by common cable ties fixed to the clamping surface. Because of the grip shoulder, the cable tie (or other fastening member) is securely fastened to the seal and does not slip from the tapered portion. In this way, the use of grip shoulders to mount and hold the clamping surface and the cable tie (or other fastening member) in place is another way of providing efficient pull-off in the seal of the present invention.

Preferred embodiments of the seal according to the invention are disclosed in the attached claims 2 to 8.

An important advantage of the seal according to the invention is that it is easy and fast to mount. Mounting does not require the use of other tools. In addition, the seals provide efficient pulloff and are inexpensive to manufacture.

The seal shown in Figs. 1 to 4 includes a first wide end portion 1 having a large diameter and a second narrow portion 2 having a small diameter. Between the ends there is a tapered conical portion 3 comprising a small diameter annular narrow end 4 and a large diameter annular end 5.

The end 1 of the seal is provided with a hole 6 for the cable 7 (FIGS. 2, 4 and 5) or the like.

In FIG. 5, the seal is mounted in the opening of the wall 11. One surface of the wall 11 at the edge of the opening is installed against the locking shoulder 15 and the other surface of the wall is installed against the seal collar 16 such that the seal collar is sealed against the edge of the opening. Is installed. The seal collar 16 slightly presses the wall 11 when in place to prevent liquid or air from penetrating through the through hole. In Fig. 1, the seal collar 16 differs in shape from that shown in Fig. 5 because it is free from external deformation.

The seal passes very easily to the final position by pushing the end 1 in the direction of arrow A while simultaneously pulling the bead in the A direction at the end 2. During pulling, the diameter of the tip 5 decreases and the cylindrical surface 20 is inserted into the opening of the wall 11. The bead 10 can be easily pinched with a finger and the nail rests on the protruding grip shoulder 12 formed by the bead while pulling. The grip shoulder 12 formed by the beads 10 forms a sharp discontinuity at the outer surface 13 of the tapered portion 3. Protruding grip shoulders 12 on the outer surface of the seal facilitate the mounting of the seal.

At the end 2 there is an annular reducing member 8, which is inside the bead and is in the form of a material reducing portion. The material reducing part 8 forms a breaking point, in which the material breaks from this breaking point when the cable 7 is pushed in the A direction with respect to the cylinder part 9 inside the material reducing part. The break point can be removed with a small force, thereby forming an opening for the cable.

The cable 7 is pushed back in the direction of arrow B after being pushed through the ends 1 and 2 of the seal, and the bead 10 is clouded to the locked position shown in FIG. This bending is possible because the tapered portion 3 is made of a thin material. In the locked position, the bead 10 seals the seal against the surface of the cable 7 and a frictional force is generated so that the cable is not pulled outward from the wall 11, ie in the B direction. In this way, the bead 10 provides an efficient pull off. The taper portion 3 is bent as shown in FIG. 6 to form a switch point 14, and the more the switch is pulled in the B direction, the more the switch point presses the cable 7. The beads 10 and the turning point 14 provide very efficient pull off because of the large friction on the surface of the cable. In most applications, the bead alone is sufficient to pull off, but the switch point 14 further improves the pull off. In the locked position, the distance X between the bead 10 and the end 1 of the seal is shorter than the distance Y between the turning point 14 and the end of the seal.

5 shows that the tapered portion 3 comprises two conical surfaces 17, 18 having different angles α and β in the axial direction of the seal, respectively. The conical surface 17 forms a clamping surface for the cable tie 19 as shown in FIG. 7 if desired. In comparison with FIG. 6, another method of pressing the seal against the cable 7 is carried out by the cable tie 19 and the clamping surface 17. The use of the seal according to FIG. 7 provides an efficient pull off. The use of Figure 7 is particularly suitable for multicore cables. Since the angle α is preferably small, 0 to 30 degrees, more preferably 0 to 20 degrees, the cable tie 19 can be securely fixed in position. When the angle β is larger than α, the total length of the seal is small, which is one advantage.

In FIG. 7, the wall 11 ′ is thicker than the wall 11. However, the seal is as shown in FIG. Since the seal comprises a cylindrical surface 20 about 5 mm wide, i.e. 4 to 6 mm, the same seal can be used for walls 1 to 5 mm thick. The flexible seal collar 16 is bent to press the walls 11, 11 'within 1 to 5 mm regardless of the wall thickness. The width, ie axial length, of the cylindrical surface 20 generally varies between 4 and 6 mm.

8 shows a second embodiment of a seal. The embodiment of Fig. 8 differs from the embodiment of Figs. 1 to 6 in that a material reducing portion 8 'is formed in the optical end 1' of the seal. In this case, there is a hole 6 'already formed in the narrow portion 2' of the seal, which corresponds to the hole 6 in FIG.

In the above, the present invention is described by way of example only. Accordingly, the details of the invention may be practiced in various ways within the scope of the appended claims. In this way, for example, the shape of the grip shoulders formed by the beads and the beads may vary from the annular member, although it is desirable when considering the compact and small size of the seal, the beads need not necessarily be at the end 2 of the seal. none. However, it can be placed shorter therefrom. If the bead is further away from the end 2 of the seal, the diameter of the seal should be larger than when the bead is at the point shown in the figure. The grip shoulders formed by the larger beads cannot be gripped well. And since the cable tie cannot be made to tighten around the cable, it cannot provide a grip shoulder which serves as a stop means for the cable tie fixed around the clamping surface 17. The seal may also be secured to a wall other than the shielding wall.

Claims (8)

Flexible seals for cable through holes mounted in walls, in particular in the openings of electrical and electronic shielding walls, The seal comprises a seal collar 16 and a locking shoulder 15 sealingly receiving the wall therebetween at the edge of the opening, a first end 1 and a second end 2, and a first end. And a taper portion 3 between and the second end, The tapered portion comprises an outer surface 13, a wide end 5 and a narrowed portion 4, wherein the narrowed portion 4 of the tapered portion is provided with a bead 10, the bead providing a pull off. From the first position closer to the first end 1 of the seal and the seal can rotate into a locked position which seals the cable sealingly, The bead 10 is in the area of the narrow end 4 of the tapered portion 3 and forms a protruding grip shoulder 12 on the outer surface 13 of the tapered portion to easily pull the seal into place in the wall. Seal featured. A seal as claimed in claim 1, wherein said grip bead is an annular member (10). 3. The tapered portion 3 adjacent to the grip bead 10 is made of a thin material such that the grip bead can rotate to the locked position such that the grip bead presses the cable surface and the first end of the seal. And the distance X from (1) is shorter than the distance Y from the outer surface of the turning point 14 between the wide end 5 and the narrow end 4 of the tapered portion to the first end of the seal. 4. The seal as claimed in claim 3, wherein the turning point (14) is arranged to press the cable surface when the grip bead (10) is in the locked position. Seal according to claim 1, characterized in that the tapered portion (3) comprises a clamping surface (17) for receiving the fastening means (19) at the narrow end (4) and reliably pressing the seal against the cable. 6. The tapered portion (3) according to claim 5, wherein the tapered portion (3) comprises a tapered surface (18) having an angle (beta) with respect to the axial direction of the seal, wherein the angle (beta) is an angle (alpha) between the axial direction of the seal and the clamping surface (17). Seal characterized by greater than. Seal according to claim 5 or 6, characterized in that the clamping surface is a conical surface (17). 2. A cylindrical surface (20) between 4 and 6 mm wide between the first end (1) and the tapered portion (3), said surface being surrounded by a locking shoulder (15), said first The end (1) comprises a flexible seal collar (16), the free end of which is directed towards the locking shoulder.