DE20220402U1 - Strain relief - Google Patents

Description

Patent Attorneys Tergau & Pohl, Nuremberg&iacgr;; * j .1.J. . ; ; ·* Page

2 Description

3 Strain relief

5 The invention relates to a strain relief according to the preamble of the claim

7 Strain reliefs are mechanical devices that support insulated electrical conductors

&bgr; or cable. The strain relief prevents a

9 conductor from a connection contact or any other interruption of the

10 Connection conductor - contact terminal due to tensile load acting on the

11 connecting cable and thus on its conductors. They relieve and

12 protect the cable connection from tensile stress. Strain reliefs are

13 are usually an integral part of plugs or devices. They are used in all &eegr; types of plugs, in junction boxes, but also in splicing devices.

15. Known strain reliefs can consist of many parts and

16 are therefore often difficult to assemble. Especially in the case of tension

17 loads based on the principle of a screw cap, the

18 assembly is often complicated. Known strain reliefs can often only accommodate one or a few cable sizes. For different cable diameters

20 Therefore, various strain reliefs must be provided.

22 The invention is based on the object of creating a strain relief which

23 is easy to assemble and accommodates a wide range of cable sizes.

24. This task is accomplished by a strain relief according to claim 1

25 solved.

27 The strain relief according to the invention has a base part for receiving a

28 cables, an arm pivotally connected to the base part, and an arm

29 in its closed position locking receptacle on the base part.

31 The basic idea of the invention is to connect the cable through a screw connection

32 The end is secured by a pivoting arm on the base part. The

(N:\AN\01866G-neu.doc)

Patent Attorneys Tergau & Pohl, Nuremberg &Idigr; J « · · J.J. · · . * Page

&igr; Arm around the cable to be secured into the slot provided on the base part.

2 and locked in its locked position. The

3 Strain relief The necessary securing pressure is not provided by a screw connection

4 connection, but by the pivoting arm. A squeezing of the

5 cable at the screw cap location is avoided. Since no

&bgr; Screwing of individual parts is necessary, the assembly of the

7 Strain relief considerably simplified.

9 The receptacle located on the base part has, according to claim 2, an engagement

10 site. This intervention site can be designed in different ways. So

11 For example, one or more recesses can be made on the base part.

12, into which the arm engages in its closed position. The engagement point

13 is preferably designed such that it can be connected to the arm in the locking

14 position an at least partially detachable, positive or non-positive connection

15 forms.

&igr;? In the embodiment of the invention claimed in claim 3, the

18 formed by two parallel legs. The arm can thus be safely placed in

ig the space between the legs that serves as the intervention site. At least

20 one of the legs is designed as a spring (claim 4). This allows it to

21 arm engaging in the holder gives way when closing. At the same time

22 it serves to secure the arm in the intervention position when the arm is already in place.

23 place.

25 The receptacle has one or more locking means for locking the arm according to claim 5.

26 has several locking teeth. The locking teeth are according to the teaching of claim 6

27 arranged on at least one inner side of the two parallel legs.

28 The arrangement of several locking teeth allows the arm to be moved to different

29 engage the holder. Cables with very different diameters can be secured in this way, as the distance between the arm and the base part can vary and

31 can be adjusted to the cable diameter.

(N:\AN\01866G-neu.doc)

Patent attorneysTergau & Pohl, Nuremberg.* !* ·&idigr;&iacgr; il . · &idigr;-' Page

&igr; In a further embodiment of the invention claimed in claim 7,

2 A fastening element is provided on the arm for engaging in the receptacle.

3. This fastening element is preferably designed such that the

4 Arm with the holder in the closed position an at least partially detachable,

5 forms a positive or non-positive connection. According to claim 8, the fastening

6 ing element is designed as a locking part. For a better locking of the arm

7 locking parts can be provided on both sides of the arm, which in

8 Final position with the corresponding locking teeth on the two inner sides

9 of the legs work together.

11 The embodiment according to claim 10 is particularly advantageous, according to which the

12 The locking part and the holder form a directional locking mechanism. This directional locking mechanism is

&eegr; preferably designed as a one-way locking mechanism to prevent movement

&eegr; of the arm in an undesirable direction, whereby the

is necessary force is absorbed by form pairing. The pivoting arm

16 is thereby secured in a certain position in which it holds the cable for pulling

17 relief. The directional locking mechanism is preferably designed as a ratchet locking mechanism

18. Such locking mechanisms are known, for example, from: Krause: Kon-

19 structural elements of precision mechanics, Hanser-Verlag, 1993, ISBN 4-446-16530-4,

₂₀ pp. 445-460.

22 In a further preferred embodiment of the invention, a safety

23 element is provided, which prevents the legs from springing up.

24 is thereby inhibited at least to the extent that the arm is secured at the point of intervention in its locked position. An accidental release of the locking

26 This excludes the possibility of a suitable training

27 By using the safety element, the springing of the legs can also be completely

28 should be avoided.

30 A corresponding hood part can be placed on the base part, which

si strain relief protects against dust and moisture and the contact protection

32. The hood part can be screwed to the base part. Preferred

(N:\AN\01866G-neu.doc)

Patent attorneys Tergau & Pohl, Nuremberg · * 'J · ···· . &iacgr;&Ggr; ** Page &igr;

&igr; The hood part can be snapped onto the base part. For this purpose

2 both the base part and the hood part have locking elements. This allows

3 create a completely screwless strain relief. The assembly of the strain

4 Relief is thereby further simplified.

6 According to the teaching of claim 14, the securing element is designed as a guide web

7 on the inside of the hood. Securing the arm at the engagement

8 place always occurs when the hood part is connected to the base part,

9, for example, is locked in place. The guide bar then lies on the leg of the

10 recording and inhibits the springing up of the legs.

12 The strain relief according to the invention can be used, for example, in plug parts, i.e.

13 socket elements or plug elements. Such

14 connector parts have the advantage that they can be used for the different cable

15 diameter can be used. In addition, they are easy to assemble

16, which makes their assembly easier.

18 Further embodiments of the invention emerge from the sub-

19 sayings.

21 The invention is described below using embodiments,

22 which are explained in more detail using the illustrations. Here:

24 Fig. 1 a first view of a strain relief according to the invention in opening

25 position,

26 Fig. 2 a second view of the strain relief according to the invention in opening

27 position,

28 Fig. 3 a third view of the strain relief according to the invention with the

29 opening position in the direction of the closed position, so Fig. 4 a view of the strain relief according to the invention with attached 31 hood part,

(N:\AN\01866G-neu.doc) lette*S»eieherung*re·ApriPax«· · · ·

♦ · * · &Igr;&Igr;&zgr;

Patent Attorneys Tergau & Pohl, Nuremberg &iacgr; J « « I J. J. . jj . * Page

1 Fig. 5 a schematic representation of various images of the inventive

2 appropriate strain relief,

3 Fig. 6 a schematic representation of various fastening elements on the

4 Arm of the strain relief according to the invention. 5

6 Fig. 1 shows a perspective view of a strain relief with a base part

7 1 and a hood part 2. The base part 1 has on its front side 3

&bgr; a support 4 into which the cable to be secured (not shown) is inserted.

9 The support 4 is preferably U-shaped and is therefore oriented towards

10 the shape of the cable cross-section. This prevents unnecessary squeezing of the

11 cable is avoided and a secure locking position is possible.

13 One U-leg consists of two parallel legs 5, 6, which are separated from each other

14 and form a receptacle 7. The two legs are formed in the receptacle direction 8, which extends orthogonally to the plane spanned by the longitudinal direction 9 and the transverse direction 10. The other U-

17 leg is designed as arm 11. The arm 11 is above the support 4

is pivotally connected to the base part 1. On the inside of the arm 12 there are

19 formations in the form of knobs 13, which in the closed position for

20 ensure improved contact between arm 11 and the cable surface.

22 As shown in Fig. 2, on the inner sides 14 of the legs 5, 6,

23 mutually directed locking teeth 15 are arranged. The locking teeth 15 are in

24 direction of reception 8 arranged one above the other and are essentially parallel

25 to the transverse direction 10. A schematic representation of the legs 5, 6 is shown in Fig.

28 The arm 11 has at its free end 16 on each side a fastening

29 element. This fastening element is designed as a locking part 17 for use in such a ratchet locking mechanism. A schematic representation of the

31 locking parts 17 on both sides of the arm 11 are shown in Fig. 6a. To facilitate intervention

32 the locking part 17 has a bevel 18. The locking part can, for example,

(N:\AN\01866G-neu.doc) l^t§Spfjft)$njng: J$V^r!TjQ(fe ,·«

Patent Attorneys Tergau & Pohl, Nuremberg · · J · *·&iacgr;. , &iacgr; · ·* Page 5

1 knob-shaped (Fig. 1, 2) or designed as a latch (Fig. 3). As in Fig. 3

2, the locking teeth 15 can then also be arranged at an inclination such that

3 that, depending on the pivoting of the arm 11, it is parallel to the engaging pawl

4 are aligned.

6 The entire base part 1 is preferably made in one piece. It can

7 can be manufactured using the injection moulding process, for example.

9 The cable is now secured in such a way that after inserting the cable

10 into the support 4 the arm 11 in the transverse direction 10 around the inserted cable-

11 and engages with its free end 16 in the holder 7. The

12 locking parts 17 then form in the locking position together with the locking teeth 15

13 a double ratchet mechanism.

15 A strain relief according to the invention with a from the open position in

16 Direction of the locking position pivoted arm 11 shows Fig. 3. Shown

17 is the moment when the free end 16 of the arm 11 is just above the holder 7 and now only needs to be pushed into the holder 7

19 must. Swinging the arm 11 around and pressing the arm 11 into

20 the recording 7 is preferably done manually. The upper side of the arm 19 has a hand-

21 support surface 20, which is particularly suitable for pressing the arm 11 into the

22 receptacle 7 and is concave in the direction of the receptacle 7. This

23 enables particularly ergonomic handling of the arm 11.

25 The leg 5 closest to the front side 3 of the base part 1 is

26 is designed to be spring-loaded so that when the arm 11 engages the holder 7

27 relative to the second leg 6, i.e. in the longitudinal direction 9. As a result

28, a simple engagement of the arm 11 in the holder 7 is possible, so that the

29 Closing the locking mechanism can be carried out without great effort.

31 Due to the large number of locking teeth 15 arranged one above the other, the

32 Strain relief used for cables with various diameters

(N:\AN\01866G-neu.doc

Patent Attorneys Tergau & Pohl, Nuremberg i J · · *»·!, . ; · «* Page

&igr; It is only necessary to adjust the arm 11 according to the cable diameter.

2 knives more or less into the holder 7 until a secure

3 Closure is guaranteed.

5 In addition to the base part 1, a hood part 2 is provided, which is attached to the base part 1

6 can be attached. The hood part 2 is connected to a connecting band 21 with

7 to the base part 1. The connecting band 21 serves primarily to

&bgr; quick and easy assembly, since the corresponding hood part 2 is always

9 hand is.

11 The hood part 2 has a U-shaped recess 23 on its front side 22

12. In contrast to previous strain reliefs, the recess 23 no longer serves to press directly on the cable sheath. It can therefore be dimensioned so generously that the hood part 2 can be used for a variety of different

can be used with cables of large and small diameters.

17 To prevent the legs 5, 6 from springing up after the arm 11 has been

is brought into the closed position, a safety catch is located on the inside of the hood 24.

19 securing element is attached. As shown in Fig. 2, the securing element is in

20 in the form of a guide web 25. The guide web 25 is designed in such a way

21 so that the two legs 5, 6 of the base part 1 are exactly between

22 the guide bar 25 and the corresponding corner wall 26 of the front side 22

23 of the hood part 2 when the hood part 2 is placed on the base part 1

24. This prevents the legs 5, 6 from springing up, at least to the extent that

25 the directional lock does not release. In Fig. 4, the base part 1 is

26 with hood part 2 attached.

28 The entire hood part 2 is preferably made in one piece. It can

29, like the base part 1, can be manufactured by injection moulding.

31 Both the base part 1 and the hood part 2 have screw elements

32 are provided, which serve to ensure that the hood part 2 placed on the base part 1

(N:\AN\01866G-neu.doc) Jletefe Spaoherungaf. &Agr;&rgr;»&Igr;·&Agr;&thgr;&iacgr;&iacgr; ·· . &Idigr; · · ··

■ &iacgr;

Patent Attorneys Tergau & Pohl, Nuremberg* I 'J · &idigr;·&iacgr;. .Jj «J Page

1 with the base part 1. Corresponding holes 27 are provided on both

2 base part 1 and the hood part 2. In a not shown

3 In another embodiment, locking elements are used instead of screw elements

4 is used so that the connection between the hood part 2 and the base part 1 is a simple snap-in connection. The snap-in elements are then preferably attached to the β points where the holes 27 are now located.

θ In Fig. 1 and 2 clearly visible is a

9 Locking device 28, which serves to connect the strain relief with a plug part (not

10 shown). For the connection with a plug part,

11 further guide elements 29 which are attached to the hood part 2.

13 This plug part then rests on the strain relief and closes the

14 seen recess 30 on the hood part 2, so that a self-contained combination of plug part and strain relief is created.

17 If two plug parts are connected together, the corresponding

18 listening strain reliefs can be connected to each other to achieve a higher

19 stability of the overall construction. For this purpose, the front side 22

20 of the hood part 2 opposite side a locking in the form of a

21 of the side locking hook 31. This locking

22 hook 31 can be connected to the corresponding locking hook of the strain relief

23 of the second connector part.

25 In further embodiments of the invention, the shape of the receptacle 7 is

26. For example, in one embodiment, the locking teeth 15 are not

27 on both inner thighs 14, but only on the inside of one

28 leg. The second leg serves only as a guide for the

29 arm 11 and stabilizes the holder 7. Fig. 5b shows schematically such a

Accordingly, only one locking part 17 is required on the arm 11.

31, as shown schematically in Fig. 6b.

Patent Attorneys Tergau & Pohl, Nuremberg J &Idigr; · · * &idigr;.&iacgr;. , ; · ·* Page g

&igr; In a further embodiment of the invention, the receptacle 7 is attached to the base

2 part 1 is not formed by two parallel legs. Instead, the

3 arm opposite U-legs, for example, from just a single,

4 preferably spring-like legs, which in turn have one or more locking

5 teeth 15. Such a receptacle 7 is shown schematically in Fig. 5c. Here too, an arm 11 with only one locking part 17 is required.

&bgr; For strain reliefs with mounts as shown in Fig. 5b and 5c, the

9 Pre-securing of the arm 11 in the closed position as shown in Fig. 5a.

10, namely by the spring action of the leg 5. A

11 Complete securing of the locking position is also achieved here with the

12 Hood part 2 by a securing element in the form of a guide bar 25 on

13 of the hood inside 24 is reached.

is In a further embodiment of the invention, the receptacle 7 is

16 a leg is formed in which several engagement points in the form of openings

&igr;? 32, into which the arm 11 can engage. Fig. 5d shows schematically

18 such a recording. The intervention sites are again one above the other

ig arranged so that different cable diameters can be provided with a strain relief

20 can be secured. The corresponding arm has a fastening element

21, which is preferably attached to the head of the arm, Fig. 6c. This attachment

22 reinforcement element, for example in the form of an engagement hammer 33, engages in

23 Final position in the correspondingly shaped recesses of the leg

24 and forms a rear grip there. The openings 32 can, for example,

25 should be attached to the thigh in such a way that it points towards the arm

26. In another example, the openings 32 are on the side of the

27 legs so that they can be directed towards the locking device 28

28. The arm is then designed in such a way that the fastening element is

29 engages in the openings 32.

(N:\AN\01866G-neu.doc)

Patent Attorneys Tergau & Pohl, Nuremberg,

*—*

List of reference symbols

1 base part

2 Hood part

3 Front side of the base part

4th edition

5 first leg

6 second leg

7 Recording

8 Shooting direction

9 Longitudinal direction

10 Transverse direction

11 Arm

12 Inner arm

13 studs

14 Inner thigh

15 ratchet

16 free arm ends

17 Locking part

18 chamfer 19 Upper arm 20 Handling area 21 Connecting band 22 Front side of the hood part 23 Recess 24 Hood inside 25 Guide bridge 26 Corner wall 27 drilling 28 Locking device 29 Guide elements 30 Recess 31 Locking hook 32 opening 33 Intervention hammer

(N:\AN\01866G-neu.doc) last storage: 1S.*Api

Claims (15)

1. Strain relief, characterized by - a base part ( 1 ) for receiving a cable, - an arm ( 11 ) pivotably connected to the base part ( 1 ), and - a holder ( 7 ) on the base part ( 1 ) which locks the arm ( 11 ) in its closed position. 2. Strain relief according to claim 1, characterized in that the receptacle ( 7 ) has an engagement point. 3. Strain relief according to claim 1 or 2, characterized in that the receptacle ( 7 ) is formed by two parallel legs ( 5 , 6 ). 4. Strain relief according to claim 3, characterized by at least one spring-like leg ( 5 ). 5. Strain relief according to one of claims 1 to 4, characterized in that the receptacle ( 7 ) has one or more locking teeth ( 15 ). 6. Strain relief according to one of claims 3 to 5, characterized in that one or more locking teeth ( 15 ) are arranged on an inner side ( 14 ) of at least one leg ( 5 , 6 ). 7. Strain relief according to one of claims 1 to 6, characterized by a fastening element on the arm ( 11 ) for engaging in the receptacle ( 7 ). 8. Strain relief according to claim 7, characterized in that the fastening element is a locking part ( 17 ). 9. Strain relief according to claim 8, characterized in that the arm ( 11 ) has locking parts ( 17 ) on both sides. 10. Strain relief according to one of claims 7 to 9, characterized in that the locking part ( 17 ) and the receptacle ( 7 ) form a directional locking mechanism. 11. Strain relief according to one of claims 4 to 10, characterized by a securing element which inhibits the springing up of the legs ( 5 , 6 ) for securing the arm ( 11 ) at the engagement point in its closed position. 12. Strain relief according to one of claims 1 to 11, characterized by a hood part ( 2 ) which can be placed on the base part ( 1 ). 13. Strain relief according to claim 12, characterized in that the base part ( 1 ) and the hood part ( 2 ) have locking elements such that they can be locked together. 14. Strain relief according to one of claims 11 to 13, characterized in that the securing element is a guide web ( 25 ) on the inside of the hood ( 24 ). 15. Plug part with a strain relief according to one of claims 1 to 14.