DE29520342U1 - Insert device for pliers for actuating a spring band clamp - Google Patents

Description

DR.-ING. ULRICH KNOBLAUCH "·' *

DR.-ING. ANDREAS KNOBLAUCH _6O32 o frankfurt/main 21. Dec. 1995

PATENT ATTORNEYS Kühhornshofweg 10

DRESDNER BANK. FRANKFURT/M. 230030800 (bank code 50080000) TELEPHONE; (069) 56301O

SWIFT CODE DRES DE FF ^{FAX: (069) 563} ° ⁰²

POSTBANK FRANKFURT/M. 34 25-605 (bank code 50010060) UST-ID/VAT: DE 112012149

RA224

RASMUSSEN GMBH

Insert device for a Zancre for operating a spring band clamp

The invention relates to an insert device for a pair of pliers for operating a clamp consisting of a spring band with jaws bent approximately radially near the ends of the spring band, which are moved towards each other to expand the clamp and are held together by placing a U-shaped clamp on the jaws, whereby the clamp contracts after the clamp is pulled off the jaws and the pliers have holes for receiving inserts near the free ends of their lever arms, which cannot be grasped manually to operate the pliers.

To open a spring band clamp, as known from DE 39 00 190 Al, for example, a pair of pliers is available commercially as per the brochure "Norma spring band clamp 3.6", September 1994, from Rasmussen GmbH. These pliers are provided with an insert near the free ends of their lever arms, which cannot be grasped manually to operate the pliers. This insert is fastened in a hole in the lever arm in question and is adapted to the jaws of the spring band clamp. For pre-assembly of the spring band clamp on a hose, which is to be clamped onto a pipe using the spring band clamp

If the hose is to be clamped, it is opened using another tool and held in the open position after the tool has been removed by means of a U-shaped clamp placed over the free ends of the jaws, so that it can easily be pushed onto the hose to be clamped.

When the hose is finally assembled on the pipe, the clamp is grasped using conventional pliers and pulled off the jaws of the spring band clamp so that the spring band clamp is pulled tightly around the hose. To remove the clamp from the spring band clamp, additional pliers are therefore required. On the other hand, with conventional pliers there is a risk that the clamp, if not grasped correctly with the pliers, will be thrown away at high speed by the spring force of the spring band clamp. The clamp can cause serious injuries to people and/or damage to objects.

0 The invention is based on the object of specifying an insert device of the type mentioned at the beginning, which simplifies the removal of the clamp from the spring band clamp and makes it safe.

5 According to the invention, this object is achieved in that

the insert device for removing the clamp has two insert pieces, each of which can be inserted into one of the holes in such a way that they overlap each other with a gap when the pliers are activated. 30

These inserts can be used in place of the inserts used to tighten the spring band clamp in the collet. To pull the clamp off the jaws of the spring band clamp, the pliers 5 are positioned so that the yoke of the clamp is between the inserts. The clamp can then be easily pulled off the clamp jaws. The pliers can, depending

Depending on which inserts are used, they can be used either to tighten the spring band clamp or to remove the clamp.

A tab is usually formed on the yoke of the clamp, which can be grasped using conventional pliers to pull the clamp off. It is therefore preferably ensured that one insert piece is approximately fork-shaped and that its prongs overlap a free end section of the other insert piece when the pliers are activated. The tab formed on the clamp can then be received between the prongs without hindering the removal of the clamp using pliers having the insert pieces according to the invention.

The conventional spring band clamp also has a tongue that protrudes from one clamping jaw towards the other, which limits the opening area and thus the maximum clamping range of the spring band clamp.

If the free end section of the other insert piece is bevelled towards the free end on its side facing away from the prongs, it can be easily inserted between the yoke of the clamp and the tongue by pressing the pliers together, whereby the prongs rest on the tongue and push the pliers together with the clamp away from the tongue and thus from the clamping jaws. In this case, no additional pulling force needs to be exerted on the clamp in order to pull it off the jaws.

The invention and its further developments are described in more detail below with reference to the attached drawings of a preferred embodiment. They show: 35

Fig. 1 a conventional spring band clamp in perspective view for clamping

a hose on a pipe or similar, the jaws of which are angled at the end and held together by a clamp before the spring band clamp is pushed onto the hose,

Fig. 2 is a perspective view of the spring band clamp according to Fig. 1 after removing the clamp,
10

Fig. 3 a perspective view of the bracket,

Fig. 4 is a perspective view of a

Pliers used to remove the clamp, 15

Fig. 5 is a front view of an insert of the pliers according to Fig. 4,

Fig. 6 is a plan view of the insert according to 0 Fig. 5,

Fig. 7 is a side view of the insert according to Fig. 5,

Fig. 8 is a side view of a second insert piece of the pliers according to Fig. 4,

Fig. 9 is a front view of the insert according to

Fig.8,
30

Fig. 10 is a perspective view of a part of the pliers according to Fig. 4 in an operating phase, in which one insert of the pliers engages over the yoke of the clamp and 35

Fig. 11 a perspective view of the lever arms of the

Pliers in the closed position together with the clamp immediately after removing the clamp from the spring band clamp.

The spring band clamp 1 according to Fig. 1 and 2 is used to clamp the end section of a hose 2 onto the end section of a pipe 3. It has approximately radially bent end sections that serve as jaws 4, 5 for clamping, i.e. opening, the spring band clamp 1. A tongue 6 formed on the jaw 4 protrudes in the direction of the jaw 5 and limits the opening area and thus the maximum clamping range of the spring band clamp 1.

Before the spring band clamp 1 is pushed onto the hose 2, it is brought into the open position according to Fig. 1 by means of a special tool attached to the jaws 4 and 5 by pressing the jaws 4 and 5 together. In this position, an approximately U-shaped clamp 7 (see also Fig. 3) is placed over the jaws 4 and 5, as shown in Fig. 1, so that the spring band clamp 1 maintains the open position and can be easily pushed onto the hose 2. After pushing the hose 2 onto the pipe 3, a tab 8 formed on the yoke of the clamp 7 can be grasped using conventional pliers and the clamp 7 can be pulled off the jaws 4 and 5 so that the spring band clamp 1 contracts tightly around the hose 2 and clamps it onto the pipe 3, as shown in Fig. 2.

According to the invention, however, a pair of pliers 9 is used to pull off the clamp 7, as shown in Fig. 4. This pair of pliers 9 is located near the free ends of its lever arms 11, 12, which cannot be grasped manually to operate the pliers 9, instead of conventional inserts, such as those used solely to open the spring band clamp in the same lever arms of a conventional pair of pliers.

-s-

provided with inserts 13 and 14, which can be inserted by means of pins 15 and 16 into holes in the lever arms 11, 12 in such a way that, when the pliers 9 are activated, they overlap one another by a distance that corresponds at least to the thickness of the yoke of the clamp 7. In the installation position according to Fig. 4, the inserts 13 and 14 are held by means of C-shaped locking rings 17, 18, which each engage in a groove in the pins 15, 16. The insert piece 13 is approximately fork-shaped (see in particular Fig. 5 and 6) and overlaps with its prongs 21, when the pliers 9 are activated, a free end section 23 of the other insert piece 14. Then, the free end section 23 of the insert piece 14 is provided with a bevel 24 on its side facing away from the prongs 21, 22 when the pliers 9 are activated, towards the free end. In order to secure the insert pieces 13, 14 against twisting in the installation position, they are each provided with a polygonal section 25, 26, which engages in a corresponding polygonal extension of the bore or a groove with a rectangular cross-section in the lever arms 11 and 12.

Fig. 10 and 11 illustrate the removal of the clamp 7 using the pliers 9. According to Fig. 10, first the lever arm 12 with the insert piece 13 is placed on the clamp 7 so that the tab 8 engages between the prongs 21, 22. Then the lever arm 11 is pivoted from the position shown in Fig. 10 into the position shown in Fig. 11 and the insert piece 23 is pressed between the yoke of the clamp 7 and the tongue 6 (Fig. 2) of the jaw 4 of the spring band clamp 1. In doing so, the bevel 24 slides up onto the tongue 6 so that the clamp 7 together with the pliers 9 is pressed upwards and lifted off the jaws 4, 5 into the position shown in Fig. 11. While 5 the spring band clamp 1 then contracts into the position shown in Fig. 2, the clamp 7 is securely held by the pliers 9 in the position shown in Fig. 11, so that

it is not thrown away by the spring force of the spring band clamp 1 when removed and cannot injure anyone or damage objects.

If desired, inserts 13 and 14

can be exchanged for the inserts intended for clamping the spring band clamp 1, so that the main part of the pliers 9 can be used for one or the other application. 10

Claims (1)

- 1 Protection claims 1. Insert device for a pair of pliers (9) for operating a clamp (1) consisting of a spring band with jaws (4, 5) bent approximately radially near the ends of the spring band, which are moved towards each other to expand the clamp (1) and are held together by placing a U-shaped clamp (7) on the jaws (4, 5), whereby the clamp (1) contracts after the clamp (7) is pulled off the jaws (4, 5) and the pliers (9) has bores for receiving inserts near the free ends of its lever arms (11, 12) which cannot be grasped manually for operating the pliers (9), characterized in that the insert device for removing the clamp (7) has two inserts (13, 14) which can each be inserted into one of the bores in such a way that they overlap one another with a gap when the pliers (9) are operated. 2. Insert device according to claim 1, characterized in that one insert piece (13) is approximately fork-shaped and with its prongs (21, 22) overlaps a free end section (23) of the other insert piece (14) in the actuated state of the pliers (9). 3. Insert device according to claim 2, characterized in that the free end section (23) of the other insert piece (14) on its side facing the tines (21, 22) is bevelled towards the free end (24).