EP2329920A1 - Pliers - Google Patents

Abstract

The pliers (1) have two plier levers (4) connected with each other by a joint (3). The levers are arranged as a component part of an insertion shaft of a tool (2) for external polygon with respect to the joint in a handle arm (5) and in a tool arm (6) with a receiver (7). A cross hole leading a locking body i.e. locking ball, is formed in a wall of the receiver. The ball is loaded in a direction on a longitudinal axis of the shaft under the influence of a spring (16) i.e. crosswise slit circular spring. The shaft has circulating locking grooves that are adapted to the ball.

Description

The invention relates to a pair of pliers according to the features in the preamble of claim 1.

Such pliers with interchangeable tools, in particular for handling of circlips (Seeger ring pliers), is within the scope of DE 89 11 388 U known. It has two mutually connected via a joint pliers lever, which are articulated with respect to the joint in each case in a gripping arm and in a tool arm with a polygon socket having a sleeve-like receptacle for an external polygon as part of a Einsteckschafts a tool. Each insert shaft is axially positionally oriented in the receptacle by means of a ball-shaped locking body loaded by a helical compression spring.

For storage of the locking body a blind hole is incorporated transversely into the outer polygon of the insertion. In the blind hole, the helical compression spring and the locking body are incorporated, wherein the Helical compression spring between the locking body and the bottom of the blind bore is located. Thus, the locking body can not leave the blind hole in the absence of insertion shaft, the mouth of the blind hole is upset.

When inserted into the receptacle insertion shaft of the locking body protrudes under the influence of the helical compression spring in the mouth region of a provided in the wall of the receptacle transverse bore, so that the insertion shaft and thus the tool are axially positionally oriented.

In view of the fact that the locking body mounted in the outer polygon of the insertion and in the wall of the receptacle only a transverse bore is provided for a variety of mounting and dismounting situations of retaining rings a larger number of tools with differently designed pin-like tool ends must be kept ready because the Einsteckschäfte can always be used only in a certain position in the recording.

Furthermore, the production in the known case is difficult and the assembly consuming, because first helical compression spring and locking body must be inserted radially into the blind hole in the insertion and only then the position of the locking body against slipping out of the blind bore by upsetting the mouth of the blind hole can be secured , In this case, the helical compression spring constantly strives to push the locking body out of the blind bore.

The invention is based - starting from the prior art - the object to improve the known pliers so that their production and assembly is easier and that in practical use fewer tools, especially with differently shaped tool ends, are required.

The solution to this problem consists according to the invention in the features of claim 1.

Advantageous developments of the invention are subject matter of claims 2 to 14.

According to the invention, a locking bore leading transverse bore is now provided in the wall of the sleeve-like receptacle for a tool. The locking body is under the influence of a spring which loads it in the direction of the longitudinal axis of the insertion. On Einsteckschaft is a adapted to the locking body circumferential Rastnute.

Due to the radially guided in the recording locking body and the circumferential locking groove on the insertion of each tool can now be plugged together in different circumferentially rotated positions with the recording. This makes it possible to reduce the number of tools with, for example, different bent tool ends. The respective anti-rotation assurance is ensured by the polygon socket in the receptacle and by the external polygon on the insertion shaft. The axial position orientation of the tool in the receptacle is effected by the radially inwardly biased by the spring locking body, which engages positively inserted into the receiving groove in the receptacle into the locking groove.

The manufacture of the forceps according to the invention is advantageous because the locking body can be easily mounted from the outside, without the spring hinders this assembly process. It will be installed later. It is also possible to produce the tools now from a significantly higher quality material, as in the Einsteckschäfte the tools no locking body and springs must be more integrated.

The invention can be applied to both pliers, in which the handle arms - based on the joint - lie on the same side as the tool arms, as well as a pair of pliers, wherein the handle arms - based on the joint - on the other side of the tool arms are arranged.

At least one spring may be provided between the forceps lever, in particular between the handle arms, which presses apart the forceps levers.

The spring is preferably provided on the circumference of the receptacle in the region of the transverse bore. It thus loads the locking body in each circumferentially rotated position radially inwards and ensures a proper positional orientation of a tool.

It can be designed as a transverse slotted annular spring. Due to this, it can be easily bent up during assembly to the required extent against the springback and be pushed over the recording to the site circumferentially the transverse bore and thus the locking body. Here it springs back and can perform its function in relation to the blocking body.

The annular spring has expediently a rectangular cross-section.

Perfect guidance of the ends of an annular spring which lie in front of each other is ensured when the slot in the spring is Z-shaped. In this way, mutually supporting tongues and recesses are formed at the ends of the spring.

Another embodiment of the spring is that it is designed as a coil spring formed from a round wire. Also, a coil spring allows due to their springback property a perfect easy mounting to the recording.

The perfect position of the spring is ensured when the recording in the transverse bore has a rectangular in cross-section circumferential recess. In this recess, the spring is embedded. The depth of the recess on the one hand and the radial thickness of the spring on the other hand are such that no areas of the spring protrude outward and thus could affect the handling of the pliers.

The secure engagement of the locking body in the locking groove and its radial load by means of the spring is guaranteed if the thickness of the wall of the receptacle in the region of the recess is dimensioned smaller than the radial extent of the locking body.

The blocking body can be designed as a latching pin. Preferably, it is designed as a detent ball.

Accordingly, it is then expedient to concave the locking groove on the insertion shank.

Although it is possible to secure the position of the locking body when not inserted in a receptacle shank of a tool, the inner of the recording facing the mouth of the transverse bore, it may also be useful manufacturing technology to reduce the diameter of the opening by successively that to produce the transverse bore two drilling operations are carried out with different diameter drills.

An advantageous development of the invention is that in the receptacle adjacent to the end face of the polygon socket and adjacent to this a cylindrical longitudinal section are formed, wherein the insertion shaft of the tool the outer polygon and adapted to the cylindrical length portion, adjoining the outer polygon cylindrical pin having.

So that a socket can be easily inserted into a receptacle, a circumferential chamfer is provided at the end of the cylindrical pin. This extends for example at 45 ° to the longitudinal axis of the cylindrical pin. When mounting a tool, the chamfer presses the locking body against the restoring force of the spring in the transverse bore, so that then the shank with the cylindrical longitudinal section and the outer polygon can be completely inserted into the receptacle. After this Inserting the locking body summarizes due to the restoring force of the spring positively into the advantageously formed in the cylindrical pin locking groove.

The manufacture of the forceps is also made even easier and easier when in the tool arm outgoing from its front longitudinal recess in the form of a blind hole and provided on the receptacle for the tool adapted to the recess extension, wherein after insertion of the extension in the Recess receptacle and tool arm are permanently connected to each other. The connection can be made by welding, soldering or gluing.

Figur 1

in der Ansicht eine Zange für Sicherungsringe;

Figur 2

eine Seitenansicht der Zange der Figur 1 in Richtung des Pfeils II gesehen;

Figur 3

im verkleinerten Maßstab die Darstellung der Figur 1 ohne Werkzeuge;

Figur 4

im vergrößerten Maßstab einen Schnitt durch die Darstellung der Figur 3 entlang der Linie IV-IV in Richtung der Pfeile IVa gesehen;

Figur 5

in der Seitenansicht eine Aufnahme der Zange der Figur 1 vor der Montage;

Figur 6

einen Längsschnitt durch die Darstellung der Figur 5 entlang der Linie VI-VI in Richtung der Pfeile VIa gesehen;

Figur 7

einen Längsschnitt durch die Darstellung der Figur 5 mit eingebautem Sperrkörper und mit einer Schraubenfeder;

Figur 8

eine Ringfeder in der Stirnansicht;

Figur 9

eine Seitenansicht der Ringfeder der Figur 8 in Richtung des Pfeils IX gesehen;

Figur 10

die Ringfeder der Figuren 8 und 9 in der Abwicklung;

Figur 11

eine Schraubenfeder aus Runddraht in der Stirnansicht;

Figur 12

eine Seitenansicht der Schraubenfeder der Figur 11 in Richtung des Pfeils XII gesehen und

Figur 13

ein Werkzeug der Zange in der Seitenansicht.

The invention is explained in more detail with reference to exemplary embodiments illustrated in the drawings. Show it:

FIG. 1

in the view a pliers for retaining rings;

FIG. 2

a side view of the pliers of FIG. 1 seen in the direction of arrow II;

FIG. 3

on a reduced scale the representation of the FIG. 1 without tools;

FIG. 4

on a larger scale a section through the representation of FIG. 3 seen along the line IV-IV in the direction of arrows IVa;

FIG. 5

in the side view a recording of the pliers of FIG. 1 before assembly;

FIG. 6

a longitudinal section through the representation of FIG. 5 seen along the line VI-VI in the direction of arrows VIa;

FIG. 7

a longitudinal section through the representation of FIG. 5 with built-in locking body and with a coil spring;

FIG. 8

an annular spring in the front view;

FIG. 9

a side view of the ring spring of FIG. 8 seen in the direction of arrow IX;

FIG. 10

the ring spring of FIGS. 8 and 9 in the settlement;

FIG. 11

a coil spring made of round wire in the front view;

FIG. 12

a side view of the coil spring of FIG. 11 seen in the direction of arrow XII and

FIG. 13

a tool of pliers in side view.

In the Figures 1 and 2 is with 1 a pair of pliers for the assembly and disassembly of unspecified illustrated retaining rings using interchangeable tools 2 (see also FIG. 13 ) designated. Such pliers 1 are known in practice also under the term Seeger ring pliers.

The pliers 1 has two pliers levers 4 which are connected to one another via a joint 3 and which are articulated with respect to the joint 3 in each case into a gripping arm 5 and into a tool arm 6.

Here, each tool arm 6 of a caliper lever 4 may be provided with respect to the hinge 3 on the same side as the associated handle arm 5 or on the opposite side. Shown is an embodiment in which the tool arms 6 are arranged with respect to the handle arms 5 on the other side of the joint 3.

Each tool arm 3 (see also FIGS. 3 and 4 ) carries a sleeve-like receptacle 7 for a tool 2 in the form of an insertable with the tool arm 6 insert.

As with common consideration of the FIGS. 4 to 6 can be seen, located in the receptacle 7 adjacent to the end face 8, a mouth-side polygon socket 9 in the form of a hexagon. The inner polygon 9 is adjoined by a cylindrical longitudinal section 10, into which a transverse bore 11 formed in the wall of the receptacle 7 opens. The recording 7 has a reduced diameter cylindrical extension 12. For fixing the receptacle 7 on the tool arm 6, a longitudinal recess 14 extending from its end face 13 is provided in the latter. After insertion of the extension 12 in the recess 14 receptacle 7 and 6 tool arm are connected to each other inseparably, in particular welded.

From the FIGS. 4 to 6 It can also be seen that the receptacle 7 in the region of the transverse bore 11 has a peripheral recess 15 which is rectangular in cross-section. In this recess 15 is either according to the representations of FIGS. 1 to 4 and 8 to 10 a spring 16 in the form of a transverse slotted cylindrical annular spring with a rectangular cross section or a spring 17 in the form of a Figures 10 and 11 recognizable cylindrical coil spring from a round wire 22 embedded. In this regard, see the FIG. 7 ,

In the transverse bore 11 is a locking body 18 in the form of a detent ball. This locking body 18 is loaded in the direction of the longitudinal axis 19 of the cylindrical length portion 10 of the spring 16 or 17. So that the blocking body 18 can not leave the transverse bore 11 in the direction of the cylindrical length section 10, the mouth of the transverse bore 11 in the cylindrical longitudinal section 10 is reduced in diameter. This measure can be done by means of an upset or by means of two drilling operations with different diameter drills. In addition, the thickness of the wall in the region of the recess 15 is smaller than the diameter of the locking body 18th

Like from the FIGS. 8 to 10 , in particular according to the settlement according to FIG. 10 , Recognizable, provided with a Z-shaped slot 29 spring 16 ends tongues 20, which engage in the ring-shaped spring 16 in corresponding recesses 21 at the other end. In this way, the spring 16 is securely guided in the circumferential recess 15 of the receptacle 7.

Both the thickness D of the spring 16 ( FIG. 8 ) and the diameter D1 of the round wire 22 of the spring 17 according to the FIGS. 11 and 12 are matched to the depth of the recess 15 that project in the assembled state of the pliers 1 on the receptacle 7 radially no parts of the spring 16, 17, which may eventually lead to a disability of the pliers 1 in practical use.

An embodiment of a tool 2 of the forceps 1 shows the FIG. 13 , The tool 2 has a pin-like tool end 23 for detecting a securing ring. At the tool end 23, a conical longitudinal section 24 connects, which merges into a Einsteckschaft 31 with an outer polygon 25 in the form of a hexagon. This outer polygon 25 is adapted to the polygon socket 9 of the receptacle 7.

On the front side of the outer polygon 25, a cylindrical pin 26 adapted to the inner diameter D3 of the cylindrical length section 10 in the receptacle 7 is provided on the insertion shaft 31 with respect to its diameter D2. The pin 26 has a circumferential, concave rounded locking groove 27, which is adapted in terms of their contour to their facing contour of the locking body 18 (see also FIG. 4 ).

Instead of the longitudinal axis 30 of the tool 2 rectilinearly oriented conical length portion 24 with the pin-like tool end 23, this may be angled, for example, even at 45 ° or 90 °. Other configurations of the lengths 24 and / or the pin-like tool ends 23 are also conceivable.

When assembling a tool 2 with a receptacle 7 of the insertion 31 is inserted with the pin 26 and the outer polygon 25 in the cylindrical length portion 10 and the polygon socket 9. An end of the cylindrical pin 26 provided circumferential bevel 28, for example, 45 ° then pushes the locking body 18 against the restoring force of the spring 16, 17 so long radially outward until the insertion of 31 of the tool 2 has reached its end position in the receptacle 7 and the Locking body 18 due to the restoring force of the spring 16, 17 can take in the locking groove 27 in the pin 26.

The polygon socket 9 in the receptacle 7 and the external polygon 25 on the insertion shaft 31 secure against rotation of the tool 2 and the locking body 18 secures in cooperation with the Rastnute 27, the axial positional orientation of the tool 2 to the tool 6.

Due to the integration of the locking body 18 in the receptacle 7 and the circumferential locking groove 27 on the insertion shaft 31, consequently, a tool 2 in several circumferentially rotated positions on the outer polygon 25 with the polygon socket 9 are assembled. In this way, a plurality of operating positions can be taken in particular with tools 2 with angled lengths 24 with a single tool 2, which facilitates the handling of the forceps 1 in the particular application.

Reference numerals:

1-

tongs

2 -

Tools

3 -

joint

4 -

caliper lever

5 -

handle arms

6 -

tool arms

7 -

Recordings f. 2

8th -

End faces v. 7

9 -

Inner polygon in 7

10 -

cyl. Length sections in 7

11 -

Cross holes in 7

12 -

Extensions to 7

13 -

End faces v. 6

14 -

Recesses in 6

15 -

Turning in 7

16 -

Ringfeder

17 -

coil spring

18 -

blocking body

19 -

Longitudinal axis v. 10

20 -

Tongues at 16

21 -

Recesses f. 20

22 -

Round wire v. 17

23 -

Tool ends v. 2

24 -

conical lengths v. 2

25 -

Outer polygon at 31

26 -

Tenon at 31

27 -

Lock grooves on 26

28 -

Chamfer on 26

29 -

Slot in 16

30 -

Longitudinal axis v. 2

31 -

male stem

D -

Thickness v. 16

D1 -

Diameter v. 22

D2 -

Diameter v. 26

D3 -

Diameter v. 10

Claims (14)

Pliers (1) which has two pliers levers (4) which are connected to one another by means of a joint (3) and which each have a handle arm (5) and a tool arm (6) with an inner polygon (9) with respect to the joint (3) Housing (7) for an external polygon (25) as part of a Einsteckschafts (31) of a tool (2) are arranged, wherein the Einsteckschaft (31) by means of a spring (16, 17) loaded locking body (18) in the receptacle ( 7) is axially position-oriented, characterized in that in the wall of the receptacle (7) for a tool (2) a locking body (18) leading transverse bore (11) is provided, wherein the locking body (18) under the influence of the spring ( 16, 17) in the direction of the longitudinal axis (30) of the one with the locking body (18) adapted circumferential locking groove (27) provided insertion shaft (31) is loaded. Pliers according to claim 1, characterized in that the spring (16, 17) is mounted on the circumference of the receptacle (7) in the region of the transverse bore (11). Pliers according to claim 1 or 2, characterized in that the spring (16) is designed as a transversely slotted annular spring. Pliers according to one of claims 1 to 3, characterized in that the spring (16) has a rectangular cross-section. Pliers according to claim 3 or 4, characterized in that the slot (29) in the spring (16) is Z-shaped. Pliers according to claim 1 or 2, characterized in that the spring (17) is designed as a coil spring formed from a round wire (22). Pliers according to one of claims 1 to 6, characterized in that the receptacle (7) in the region of the transverse bore (11) has a cross-sectionally rectangular circumferential recess (15). Pliers according to claim 7, characterized in that the wall thickness of the receptacle (7) in the region of the recess (15) is smaller than the radial extent of the locking body (18) is dimensioned. Pliers according to one of claims 1 to 8, characterized in that the blocking body (18) is designed as a detent ball. Pliers according to one of claims 1 to 9, characterized in that the latching groove (27) is concavely troughed. Pliers according to one of claims 1 to 10, characterized in that the radially inner mouth of the transverse bore (11) is reduced in diameter. Pliers according to one of claims 1 to 11, characterized in that in the receptacle (7) adjacent to the end face (8) of the polygon socket (9) and adjacent to this a cylindrical longitudinal section (10) are provided, wherein the insertion shaft (31) the external polygon (25) and a cylindrical pin (26) adapted to the cylindrical longitudinal section (10) and adjoining the external polygon (25). Pliers according to claim 12, characterized in that an encircling chamfer (28) is provided at the end of the cylindrical pin (26). Pliers according to one of claims 1 to 13, characterized in that in the tool arm (6) one of its end face (13) outgoing, longitudinal recess (14) and on the Receiving (7) adapted to the recess (14) extension (12) are provided, wherein after insertion of the extension (12) in the recess (14) receptacle (7) and tool arm (6) are connected to each other inseparably.

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