DE9403137U1 - Spring clip for an electrical conductor - Google Patents

Description

Patent AttorneysTergau & Pohl, Nuremberg .*·.;··· .**.«**, ,·· · Page 1

2 Description

&bgr; Spring terminal for an electrical conductor

8 The invention relates to a spring clamp with the features defined in the preamble of claim

9 1. Such a spring clamp is, for example, the subject of

10 DE 30 19 149 C2. The basic advantages of a design are also described there.

11 tion that allows the spring clamp to be assembled with

12 opening position clamping spring. For connection of an electrical

13 irish cable to the spring clamp, the clamping spring does not need to be first π transferred to its opening position, which is usually done by is a special tool (there column 3, lines 24 ff). ie Rather, the clamping spring can then be moved by the already in the opening position in the delivery state.

17 position, the clamping spring directly contacts the stripped end of the

18 closing electrical conductor in the space between spring terminal

19 and connecting contact. Then only the locking

20 stung which holds the clamping spring in its open position. This

21 Releasing the locking mechanism requires either a tool, e.g. a

22 screwdriver tip, or it is done by inserting the stripped

23 Connection end of the electrical conductor itself.

25 Furthermore, it is known from DE 37 27 091 C1 that both for the transfer of the

26 Clamp spring in its ready-to-assemble open position as well as for the lifting

27 of the open position and the resulting spring pressure automatically

28 completed contacting each a separate, externally actuated

29 actuating element on the insulating housing, whereby the respective relative

30 Position of at least one of these actuators relative to the insulating—

si fabric housing can be seen from the outside whether the spring clamp is in assembly

32 ready opening position or in contacting closing position

33 - hereinafter referred to as "contact position" - is located. The disadvantage of this

34 embodiment is, however, that when connecting very large conductor cross-sections

35 sections, e.g. the nominal cross-section, the position of the actuating elements in the contact position hardly differs from that in the open position.

February 24, 1904

Patent attorneysTergau & Pohl, Nuremberg .··.;··· .·· · · ·· · Page 2

&igr; The invention is based on the object of providing a spring clamp of the initially

2 so that they can be opened with the

3 clamping spring is available and that the clamping spring can be easily

4 Establishing the electrical connection of a conductor in its contact position

5, whereby the functional position of the clamping spring can be clearly seen from the outside. The solution to this problem is made possible by claim 1.

7 It does not require the use of a tool, but can be carried out directly

8 telbar by hand. To enable this solution, each connection

9 only one additional part, the pivoting pressure pin, is necessary. It can be

10 material-saving with a relatively small, made of insulating material housing

11 protruding handle end, because pulling out its

12 Printing from its spring-loaded, self-locking insertion position

13 not by manually pulling the pressure pin in the direction of its longitudinal axis, &eegr; but by pivoting it around the said pressure end

is, whereby the tensile force necessary for initiating the release movement

ie by sliding its shoulder along the housing-side control surface

&eegr; is applied. The housing-side control surface and the handle-side shoulder

is the pressure pin form the two functional parts of a cam mechanism, which

19 ches between the two pivot positions of the pressure pin is effective,

µm; one of which is assigned to the opening position and the other to the release

21 solution of the contact.

23 This does not exclude the possibility that the terminal may also be in the tripped contact position

24. The advantage over conventional

25 screwless terminals, that all terminals on site at the construction site or in the assembly hall before final assembly by pressing the

27 pressure pins are opened. After installing the pre-assembled terminal blocks

28 in the control cabinet or the control can then be used as described above.

29, whereby no additional tools are required to connect the conductors. so.

32 Finally, the user can go one step further and

33 terminals without actuating element, which he can use as standard

34 screwless terminals can be operated with a screwdriver and

35 he can decide on site which terminals he would prefer to retrofit with a pressure pin and which he would not.

February 24, 1994

Patent Attorneys Tergau & Pohl, Nuremberg .··,;··· .**,.··. *· * Page 3

&igr; The design of the pressure pin according to claim 2 means that its

2 Pressure end is designed and effective similar to a screwdriver blade.

3 This allows the pressure pin to be inserted into the receiving space of the iso-

4 lierstoffgehäuse for transferring the

5 clamping spring into its open position. Claim 3 serves the same purpose.

8 Claim 4 ensures that the pressure pin, when a

9 Insertion end position not by the clamping spring tension above the said

10 wedge is pushed back into its original position. Rather,

11 thereby maintaining the achieved opening position of the clamping spring. This

12 The function of the clamping spring can be recognized from the outside by the fact that the grip end of the pressure pin protrudes only slightly from the insulating housing.

ie The designs according to claim 5 or 6 ensure that the

&igr;? Insertion position of the pressure pin reached opening position of the clamping spring

is sustainably secured and not accidentally, for example due to vibrations

19 regulations or the like can be lifted.

21 Claim 7 automatically ensures that the pressure pin, when it reaches its

22 Insertion position the swivel starting position between its handle side

23 shoulder and the control surface of the insulating housing.

25 Claim 8 ensures that the pressure pin in the contact position of the clamping spring

26 cannot be accidentally removed from the insulating housing. In the said

27 contact position, the pressure pin is no longer between the clamping spring and

28 opposite wall of the housing recess,

29 but freely movable. When the functional parts are in the stop position, the actuating end of the pressure pin is clearly

31 further out of the insulating housing than is possible in plug-in

32 position is the case. This protrusion clearly signals to the outside that

33 the clamping spring is in contact position. This visibility is

34 is additionally favoured by the fact that the wedge angle of the pressure end of the pressure 3s pin is not self-locking in relation to its counter-bearing parts

se (claim 3). This means that the pivoting path of the actuating end of the 37 pressure pin for transferring the clamping spring from its open position to its as contact position can be kept very short. The control surface on the iso-

February 24, 1994

Patent attorneys Tergau & Pohl, Nuremberg ··♦··· ·· .· ··. Page 4

&igr; lierstoffgehäuse can therefore be dimensioned relatively small in the swivel direction

&zgr; because it only needs to cause a relatively small pulling movement, which

3 retracts the inhibiting area from the action of the clamping spring.

4 As soon as the contact area of the clamping spring reaches the area adjacent to the

5 has reached the wedge flank of the pressure end of the pressure pin, the clamping spring expanding under its pre-tension presses the pressure pin due to the

7 Lack of self-locking of the wedge angle against its opposites

&bgr; automatically from the receiving space of the insulating housing in axial direction

9 outwards until the locking device is secured by the stop shoulder on the

10 housing-side counter-stop is effective.

12 The subject matter of the invention is explained with reference to a device shown in the figures.

13 embodiments are explained in more detail. They show

15 Fig. 1 a terminal block equipped with spring terminals of the type according to the invention, but without pressure pins for the function actuation

&igr;? of the spring terminals,

18 Fig. 2 isolates the receiving space with clamping spring is section II of Fig. 1 with the clamping spring in the contact position

20 pressure pin,

21 Fig. 3 is a front view of the insulating housing in the direction of arrow III of Fig. 2z 2, with particular attention being given to the two insertion openings on the one hand for

as the pressure pin and on the other hand for the electrical conductor

24 are,

25 Fig. 4 a view analogous to Fig. 2 with the slide further inserted in the insertion direction.

26 benem pressure pin in a position in which the clamping spring the pressure

27 pin on a wedge flank of the print end in the transition area to the

28 Inhibition area of the pressure pin applied,

29 Fig. 5 is a representation similar to Fig. 2 and Fig. 4 with the pressure pin in the end position of insertion, where the clamping spring acts on the pressure pin in its inhibiting area,

sä Fig. 6 a side view of the pressure pin,

33 Fig. 7 is a plan view of the pressure pin in arrow direction VII of Fig. 6 and

34 Fig. 8 is a plan view of the actuating end of the pressure pin in arrow—

35 direction VIII from Flg. 6.

37 A spring clamp according to the invention is shown in Fig. 1, for example, within the

This oval, dotted area marked with Il is shown. The

24. February-1994

Patent Attorneys Tergau & Pohl, Nuremberg · ; · ; · _# · · ··;···· Page 5

&igr; spring clamp according to the invention can be used with any designed and for

2 electrical device, electrical component or similar intended for any purpose.

3 application. The spring clamp according to the invention is used in the

4 shown terminal block is implemented twice, also in the upper connection B terminal area.

7 The spring terminal is used to contact a component not shown in the drawings.

β shown electrical conductor with a in the receiving space 1 of the insulating

9 material housing 2 arranged connection contact 3. The total of 4

10 is attached to the connection con-

11 contact 3 is riveted on, i.e. firmly connected to the connection contact 3. When

12 example, the clamping spring 4 is a cage tension spring with a clamping cage

13 fig 6 in the movement leg 7 of the clamping spring 4. The clamping cage 6 serves to

14 Receptacle for a cable inserted into the insertion opening 8 of the insulating housing 2.

15, stripped in the clamping area electrical conductor. In the opening position shown in particular in Fig. 5, but also in principle in Fig. 4 of the

&igr;/ Clamping spring 4 allows the electrical conductor with its stripped end

is inserted through the insertion opening 8 into the clamping cage of the motion

19 leg 7 of the clamping spring 4 can be inserted without hindrance. In this opening

20 position, the clamping spring 4 is essentially in the form of a

si clamping wedge having pressure pin 9 compressed in the insertion direction 10

22 can be inserted into the actuating opening 11 of the insulating housing 2, which is approximately

23 runs parallel to the insertion opening 8 for the electrical conductor and is

24 as these are inserted into the receiving space 1 of the insulating housing 2.

25. By inserting the pressure pin 9 in the insertion direction 10, the clamping spring 4 is tangentially compressed in the area of its skid-like bend 12.

27 is loaded and compressed with the result that the movement leg 7 with

28 the clamping cage 6 in an overlapping position with the insertion opening 8

29. A conductor inserted into the insertion opening 8 can therefore be

30 a stripped end can pass unhindered through the clamping cage 6. si Generally speaking, the clamping spring 4 is thereby brought into its contact position

32 (Fig. 1,2) so that the pressure pin 9 is moved against the insertion direction 10,

33 namely in the pulling direction 13 (Fig. 2) pulled out of the insulating housing 2.

34 so that it no longer has any effect on the contact spring 4 (Fig. 2).

35 This allows the clamping spring 4 to relax to such an extent that its bend 12 practically hits the side wall 14 of the receiving space 1 or at least comes close to it 37 and thereby presses the end of the electrical conductor lying in the clamping cage 6 against the bottom 14a of the connection contact 3, which

M.M&Z1SS4

Patent Attorneys Tergau & Pohl, Nuremberg .*%;·*· .*·,«··. ,**.« ^Page

&igr; to improve the electrical contact of the conductor end, corrugated or

2 is roughened.

4 If a cage tension spring is used as the clamping spring in the embodiment

βgr;, this is only an example. As with the state of the art

&bgr; Technology initially mentioned construction according to DE 30 19 149 C2 depends on

&tgr; the design of the clamping spring for the below explained in detail

8 do not determine the essence of the invention. There may also be

9 Different types of clamping springs can be used for the object of the application.

10 It is only important that these clamping springs have a spring pressure leg

11, through which the electrical conductor is connected to a connection contact

12 can be determined. According to the previous part of the figure description, the is functionality of the embodiment still corresponds to the state of the art, &eegr; which is already specified in DE 30 19 149 as the state of the art taken into account there (column 3, lines 9-32). According to this, when connecting the electrical conductor ie, before inserting the stripped conductor end, the movement or

17 Clamping leg of the clamping spring from the contact wall or from the connection con-

18 tact by e.g. a screwdriver, which in the invention

19 object is in a sense substituted by the pressure pin 9. In this

μ conventional contacting with the aid of a contact inserted into the actuating opening

21 The screwdriver tip to be inserted into the opening 11 also initially lays a

22 from its two wedge flanks in the area of its bend 12 to the clamping

23 spring. If the screwdriver tip is in its insertion end position,

24 Even with the old state of the art, the compression of the clamping springs

25, namely the transfer of its movement leg 7 into the opening—

26 position (Fig. 4,5) by a slight pressure on the operating handle of the screw

27 swivel movement initiated by the driver which is located on the side wall 14 of the

28 receiving space 1 supporting screwdriver tip, whereby this

29 Pivoting movement is carried out within the plane of movement of the clamping spring 4, i.e. with reference to the drawings Fig. 1 - Fig. 5.

32 The subject matter of the invention replaces a conventional screwdriver

33 Actuation of the clamping spring 4 by a specially designed pressure

34 pin 9: The pressure pin 9 has a longitudinal axis 15, a handle end 16 and a

35 pressure end 17 (Fig. 6). The insertion direction 10 and the pulling direction 13

They run approximately in the direction of its longitudinal axis 15. The pressure end 17 consists

37 starting from the wedge tip 18 from a converging direction towards it.

38 wedge 19 with the spring-side load-bearing element 12

February 24, 1904

Patent AttorneysTergau & Pohl, Nuremberg »··,;··· ,··,,··« ·· · Page 7

&igr; wedge flank 20 and with the opposite side wall 14 of the receiving

2 meraums 1 in insertion position, housing-side wedge flank

s The wedge 19 with the two wedge flanks 20,21 is tensioned in the movement

6 plane of the clamping spring 4 or its movement leg 7, i.e. in the

7 movement plane of the recording room 1, namely the drawing plane of the

8 Fig. 1,2 and 4-6. The wedge 19 corresponds in its function to the

9 said screwdriver tip in the state of the art and the wedge angle

10 (Fig. 6) is designed so that it is not self-locking. Its wedge flanks

11 20,21 are therefore also to be considered as sliding flanks in accordance with their function.

12. Together with the skid-like bend 12 of the clamping spring 4 above

13, they are analogous to the flanks of the screwdriver tip already explained &eegr; according to the known state of the art, the function of the insertion of the

is to facilitate the movement of the pressure pin 9 in the insertion direction 10 up to a position (Fig. 4) shortly before reaching the end of the insertion position (Fig. 5). Meanwhile, the wedge angle 22 is dimensioned such that the pressure pin 9 does not have to be additionally pivoted during this insertion movement up to the position shown in Fig. 4 shortly before reaching the end of the insertion position 19. In practice, this means that the wedge angle 22 is significantly larger than the usually smaller wedge angle 22.

21 angle of a screwdriver tip. In screwdriver technology

22 According to the state of the art, the screwdriver is used after reaching

23 its insertion end position nor by means of its handle in the movement

24 plane of the clamping spring 4, while in the invention

25, the opening position of the movement leg 7 of the clamping spring 4 was on 2β due to the larger wedge angle 22 of the pressure pin 9 solely by the insertion

27 Thrust movement of the pressure pin 9 in the insertion direction 10 is achieved.

29 The wedge 19 or the sliding area 23 (Fig. 6) is followed in the pulling direction

the inhibiting area 24 of the pressure pin 9. The inhibiting area 24 is defined by the

si the locking flank 25 of the wedge flank 20 adjoining the locking spring side

32 pressure pin 9. The inhibiting flank 25 forms with its counter flank 26

33 a closing in the direction of tension 13 or in the direction of compression 10 to

34 pressure tip 18 towards the acute angle 27 (Fig. 6). In the insertion end position

35 When the pressure pin 9 is pushed in (Fig. 5), the clamping spring 4 applies its bending 12 to the arresting flank 25 or the arresting area 24 of the pressure pin 9. In this area, there is self-locking between the pressure pin 9 and the clamping spring. The clamping spring 4 is thus also effectively protected against vibrations.

February 24, 1994

Patent Attorneys Tergau & Pohl, Nuremberg ·*♦··· ·· ·· ·· * Page 8

&igr; their open position ready for connection or assembly (Fig. 5). The

2 Self-locking has the effect of a spring locking mechanism with the

3 Inhibiting flank 25 as a locking recess and the clamping spring 4 as a locking spring.

5 The pressure pin 9 is outside the insulating material in every functional position.

6 housing 2 is of greater width 28 than in particular the adjoining shaft area 29 of the pressure pin 9 (Fig. 7). This forms the

8 Handle end 16 on both sides of the flanks of the shaft area 19 protruding

9 Shoulders 30,31. The shoulders 30,31 formed by the insulating material

10 housing 2 facing surfaces are control surfaces 32, which are opposite the

11 Longitudinal axis 15 are inclined at an acute angle (angle 33). With his shoulders

12 30,31 or the inclined control surfaces 32 formed thereby, the pressure

13 pin 9 in the insertion position (Fig. 5) on appropriately designed counter-control

14 surfaces 34 which are located on the lateral boundary edges of the actuating openings

15 opening 11 of the insulating housing 2. The shoulders 30,31 of the

16 pressure pin 9 form a cam mechanism with the counter control surfaces 34 of the insulating housing 2. By pivoting the pressure pin 9 (Fig. 5) in the insertion end position clockwise (arrow direction 35), the

The shoulders 30,31 or the control surface 32 of the

20 pressure pin 9 on the counter control surfaces 34 of the insulating body 2, where

21 through the handle end 16 of the pressure pin 9 in the pulling direction 13 from its

22 end position (Fig. 5).

24 The swivel angle in the direction of arrow 35 only needs to be large enough to

25 Contact area (bend 12) of the clamping spring 14 from the inhibiting area 24 ze via the transition stage 36 into the sliding area 23, namely in contact

27 with the spring-side wedge flank 20. Through this transition into the sliding

28 area 23 the self-locking mechanism between clamping spring 4 and pressure pin 9 is

29 is lifted and the pressure pin 9 is automatically pushed outwards in the pulling direction 13 by the reaction pressure of the clamping spring 4. This area of the

si automatic pushing out of the pressure pin 9 from the receiving opening 1

32 begins with the relative position shown in Fig. 4 between pressure pin 9 and

33 Clamping spring 4. It ends with the relative position shown in Fig. 2 between

34 these two functional parts. It is clearly visible how far in this

35 End position of the spring-induced extension of the pressure pin 9 with its

se handle end 16 protrudes beyond the front wall 37 of the insulating housing 2. 37 As a result, the position of the handle end 16, which is clearly visible from the outside of the insulating housing 2, differs depending on whether the clamping spring

February 24, 1994

Patent Attorneys Tergau & Pohl, Nuremberg **·,;£··· ,*%„·*» ,".J Page 9

&igr; 4 is in the open position ready for installation (Fig. 5) or in the closed contact position (Fig. 3).

4 In order to compensate for the reaction pressure of the clamping spring 4 in the sliding area 23,

5 to limit the outward movement of the pressure pin 9 in the pulling direction 13,

&bgr; the pressure pin 9 has a stop shoulder adjacent to its key tip 18

7 38, which has a housing-side counter stop 39 to prevent loss

a. The counter stop 39 is part of the inner wall of the receiving space 1 in the

&bgr; insulating housing 2. The stop shoulder 38 is laterally to the wedge

10 19 spanned plane over at least one flank of the pressure pin 9

11 beyond.

is In the front side of the handle end 16 is a fixing recess 39 for receiving

µm, e.g. a screwdriver blade 40 shown here in dot-dash lines (Fig. 2)

is inserted, with which the pressure pin 9 in the insertion direction 10 into the receiving

16 chamber 1 of the insulating housing. This allows the spring

17 terminal even after assembly, i.e. after contact with an electrical

18 see ladders (Fig. 2) for example for repair purposes back into their openings.

19 position (Fig. 5) to release the contact. µ first presses the wedge 19 by penetrating the gap between

21 clamping spring 4 and side wall 14 the movement leg 7 of the clamping spring

22 4 into its opening position (Fig. 4). At the end of this opening movement,

23 the contact area (bend 12) of the clamping spring 4 over the transition stage

24 from the sliding area 23 into the inhibiting area 24 of the pressure pin flank. With this the pressure end 17 of the pressure pin 9 is rotated counterclockwise

26 sinn pivoted from the position shown in Fig. 4 into a position shown in Fig. 5,

27 that its housing-side wedge flank 21 is in a parallel support position on the

28 Side wall 14 of the receiving space 1 is pivoted. Equivalent to

29 To achieve this pivoting end pitch shown in Fig. 5, the over-

30 guiding the handle end 16 of the pressure pin 9 into its swivel starting position

31 relative to the control surfaces 34 of the cam mechanism acting between it and the front wall 37 sä of the insulating housing 1 to facilitate

33 later removal of the pressure pin 9 from its opening position of the

34 Clamping spring 4 (Fig. 5) maintains the insertion end position.

se To return the clamping spring 4 to its contact position, i.e. to contact

37 The electrical conductor is connected to the front wall 37

38 Handle end 16 of pressure pin 9 in arrow direction 35, namely clockwise

February 24, 1994

Patent Attorneys Tergau & Pohl, Nuremberg _t ^# *,J*·· ,·*,,·% »",« ^Page ^ ®

pivoted, whereby the pressure pin 9 is pulled by a certain amount in the pulling direction 13 until the contact area of the clamping spring 4 (bend 12) passes over the transition step 36. The further automatic extension of the pressure pin 9 from the actuating opening 11 of the insulating housing 2 until the stop of the loss prevention device is already described above.

February 24, 1994

Patent attorneys Tergau & Pohl, Nümbeig

·

List of reference symbols

1 recording room

2 Insulated housing

3 Connection contact

4 clamping spring

5 Rivet connection

6 Fixation cage

7 Movement legs

8 Insertion opening

9 Pressure pin

10 Insertion direction

11 Operating opening

12 Bend

13 Direction of pull

14 Side wall 14a Floor

15 Longitudinal axis

16 Handle end

17 Printing

18 wedge tip

19 Wedge

20 wedge flank

21 Keii flank

22 wedge angle

23 Sliding area

24 Inhibition area

25 Inhibitory flank

26 Counter flank

27 acute angle

28 Width

29 Shaft area

30 Shoulder

31 Shoulder

32 Control surface

33 angles

34 Counter control surface

35 Arrow direction

36 Transition stage

37 Front wall

38 Impact shoulder

39 Fixing recess

40 Screwdriver blade

14 March 1994

Claims (1)

Patent Attorneys Tergau & Pohl, Nuremberg _# Page 1 94092-1/11 3 24 February 1994 6 Claims 9 1. Spring clamp for contacting by means of a clamping spring (4) 10 of an electrical conductor with a receiving space (1) of an insulating&mdash; 11 Connection contact (3) arranged in the fabric housing (2), 12 - wherein the clamping spring (4) is held in place by the wedge-like insertion of a pressure pin (9) in its longitudinal direction into the space between 14 see clamping spring (4) and adjacent side wall (14) of the receiving 15 chamber (1) under further spring tension from its connection con- 16 contact position (Fig.2) acting on the contact (3) in a position 17 contact (3) can be deflected into the raised opening position (Fig.4,5), in which the electrical conductor can be moved freely for its insertion or removal 19 is, 20 characterized by 21 that the handle end (16) protrudes from the insulating housing 22 and transverse to its insertion direction (10) in approximately the deflection plane 23 of the clamping spring (4) can pivot about its wedge-like pressure end (17). 24 bare pressure pin (9) with a handle-side shoulder (30,31) such as 25 Control surface (34) effective housing area, 2β - that by its pivoting in approximately the deflection plane of the clamping spring 27 (4) along the control surface (34) its pressure end (17) from its the 28 Clamping spring (4) acting wedge-like insertion position (Fig.5) 29 is pulled out and the contact position of the clamping spring (4) is thereby restored as a result of springing back. 32 2. Spring clamp according to claim 1, 33 characterized by 34 that the pressure end (17) of the pressure pin (9) is in the insertion direction (10) 35 converging wedge (19) is formed, the wedge flanks (20, 21) of which span a wedge angle (22) lying approximately in the deflection plane of the clamping spring (4). 24 February 1994 (U:WaiV84092.txt) Patent Attorneys Tergau & Pohl, Nuremberg _#<# Page 2 &igr; 3. Spring clamp according to claim 2, 2 characterized by 3 that the wedge angle (22) is not 4 is self-locking. 6 4. Spring clamp according to one or more of the preceding claims, 7 characterized by 8 a flank region (25) of the pressure pin (9) adjoining the wedge flank (20) of the pressure end (17) on the clamping spring side towards the &bgr; handle end (16), 10 which acts as a locking area for the clamping spring (4) in the end position of insertion (Fig. 5) 11 (24) self-locking. is 5. Spring clamp according to claim 4, &eegr; characterized by is that the locking area (24) is designed as a locking recess of a spring locking mechanism ie is designed, the clamping spring (4) acts as its detent spring. is 6. Spring clamp according to claim 4 or 5, ig characterized by 20 that the inhibition area (24) with its counter flank (26) forms a recessed 21 thrust direction (10) opening acute angle (27). 23 7. Spring clamp according to one of claims 4-6, 24 characterized by 25 such a design that the inhibiting area (24) in the opening position 26 The clamping spring (4) acting on the spring clamp pushes the pressure pin (9) into 27 towards its swivel starting position (Fig.5) opposite the control 28 surface (34) is acted upon. so 8. Spring clamp according to one or more of the preceding claims, si characterized by 32 a stop shoulder (38) of the 33 pressure pin (9), which with a housing-side counter stop (39) forms a 34 forms a loss protection. 24 February 10Ö4 (LWaiVS40ö2.txt) Patent Attorneys Tergau & Pohl, Nuremberg ., ... Page 3 &igr; 9. Spring clamp according to claim 8, 2 characterized by 3 that the stop shoulder (38) extends laterally to the pressure wedge plane over a flank 4 of the pressure pin (9). 6 10. Spring clamp according to one or more of the preceding claims 7 characterized by β one for holding a pressure tool, e.g. a screwdriver 9 blade, certain fixing recess (39) on the handle-side end of the 10 pressure pin (9). 24 February 1994 (iU:Wan#4Qa2.txt)