EP3403768A1 - Device for bending a splint - Google Patents

Abstract

The invention relates to a device (18) for bending a cotter pin (4) for securing the position of a workpiece (2), in particular for preventing rotation of a castellated nut. The apparatus comprises a tool body (22) and a holding member (20) for holding the split pin (4) during a bending operation. The holding member (20) is rotatably mounted on the tool body (22). The device (18) has a bending element (26) which is arranged on the tool body (22) in such a way that one end of a cotter pin (4) held on the holding component (20) is rotated relative to one another by a relative rotation between the holding component (20) and the tool body (20). 22) on the bending element (26), in particular form-flush to the workpiece (2), is bendable.

Description

The invention relates to a device for bending a cotter pin.

A split pin is a securing element that serves to secure connected components. For example, nuts, in particular castellated nuts, can be secured against accidental rotation with a split pin. To prevent the splint slipping out, the ends of the splint can be bent over. For this purpose, for example, be hit by hammer on the splint ends.

This has the disadvantage that the product to be secured can be damaged with the hammer blows. In addition, the quality of work and the time required vary considerably. With increasing thickness of the split pins, the described effects increase accordingly. Due to the use of the hammer, there is also a risk of injury to the user of the hammer.

In the prior art, some tools are known that can be used to loosen or secure a cotter pin. Such a tool is for example in the US 1,649,513 disclosed.

The invention is based on the object to provide an (alternative) device for bending a cotter pin, with the same quality of work reliable bending of the cotter pin ends in particular for rotation of a castellated nut is made possible.

The object is achieved by a device according to the independent claim. Advantageous developments are specified in the dependent claims and the description.

The device (pin bending tool) is used for bending a cotter pin for securing the position of a workpiece, in particular for preventing rotation of a nut, preferably a castellated nut. The device comprises a tool body and a holding member for holding the split during a bending operation (of the splint). The holding member is rotatably mounted on the tool body. The device has a bending element. The bending element is arranged on the tool body such that one end of a pin held on the holding component can be bent over by a relative rotation between the holding component and the tool body on the bending element, in particular flush with the shape of the workpiece.

The relative rotation between the holding member and the tool body (and thus between the held in the holding member cotter pin and the tool body) allows a reliable and fast bending of the splint ends of a splint with the same quality of work. Since no hammer must be used, the risk of injury also decreases and the component to be secured can not be damaged by the hammer.

In particular, the device can bend over splint ends of a split.

In particular, an axis of rotation of the holding member inclined, preferably perpendicular, extend to a longitudinal axis of the tool body.

The tool body may, in particular, have a jib for rotatably supporting the holding component.

The bending element may in particular be arranged at one end of the tool body.

In particular, the bending element can be fixed or attached with respect to the tool body, preferably a cantilever of the tool body.

In particular, the split pin can have two legs, which are connected via a sapwood head. Preferably, the two legs of the split pin can be of different lengths and together form a round cross section. The sapwood head can preferably be designed as an approximately circular loop.

In particular, the split pin can be designed as a standard pin according to DIN EN ISO 1234.

The sapwood can be of any size. Preferably, the sapwood may have a length greater than or equal to 100 mm and / or a diameter adapted for a bore diameter of 8 mm or greater (so-called 8-sine or greater).

In one embodiment, a first splint end of the splint can be bent in a first direction of rotation on the bending element by a relative rotation between the tool body and the holding component. A second splint end of the split pin is bendable by a relative rotation between the tool body and the holding member in a second direction of rotation, which is opposite to the first direction of rotation, on the bending element. Thus, you can both splint ends of a splint are bent by two pivotal movements of the device in opposite directions.

In a further embodiment, the holding member holds the split pin on a split pin head of the split. Alternatively or additionally, the holding member has a holder for holding a sapwood head of the split. The holder may be formed in particular as a pin or projection.

In one embodiment, the holding member during the relative rotation between the holding member and the tool body rotatably secured to the workpiece. This allows a relative rotation between on the one hand the workpiece (nut, castellated nut), the cotter pin and the holding member and on the other hand, the tool body and the bending element.

In a further embodiment, the holding member is adapted to engage with the particular designed as a nut, preferably castellated nut workpiece for non-rotatable securing of the holding member on the workpiece. Alternatively or additionally, the holding member has at least one fastening element for the rotationally secure securing of the holding member on the workpiece.

In a preferred embodiment, the at least one fastening element is designed for engagement in at least one recess in a crown portion of the workpiece designed as a castellated nut. Thus, the holding member during the bending process of the splint can be securely held on the castle nut.

In one embodiment, the holding member is formed as a turntable. The turntable may, in particular, have an outer wall region designed as a ring segment section, in particular a half ring segment section.

In particular, the outer wall portion may extend from a plate portion of the holding member as a projection, particularly in a direction parallel to a central axis and in a circumferential direction about the central axis of the holding member.

In a further development, the outer wall region is arranged on a side of the holding component facing away from the bending element. Alternatively or additionally, the outer wall region is designed for partially enclosing the workpiece, in particular the castellated nut.

In a further embodiment variant, the outer wall region has a recess for passing through the splint, in particular a splint section adjoining a splint head of the splint.

In one embodiment, the holder and / or the recess is arranged on a side facing away from the bending element of the holding member.

In a further embodiment, the holding member is slidably mounted on the tool body, so that in particular a distance between the holding member and the bending element is variable. This can on the one hand enable the possibility of adaptation to the given geometry of the workpiece and of the splint. On the other hand, this can make it possible to position the bending element as close as possible to the workpiece, so that the split ends can be bent flush against the workpiece fitting.

In one development, the tool body has a slot in which the holding member is slidably mounted, so that in particular a distance between the holding member and the bending element is variable.

In a further embodiment, the device further comprises a mechanism for converting a pivoting movement between two gripping parts of the tool body to a translational movement of the holding member, in particular in a direction to or away from the bending element. Thus, the bending element can be positioned close to the workpiece in a simple manner, so that the splint ends can be folded flush against the workpiece fitting. Before and after bending, the flexure can be removed from the workpiece and cotter held in the fixture to facilitate placement and removal of the fixture.

In a further development, the holding member is connected to a push rod for moving the holding member.

In a preferred embodiment variant, the tool body has a first grip part and a second grip part, which is pivotally connected to the first grip part. A pivoting of the second handle part to the first handle part causes a displacement of the holding member to the bending element by means of the push rod.

In one embodiment, the bending element is designed as a pin, which preferably has a bending edge and two, in particular, flat bending surfaces, which are connected to one another via the bending edge.

In particular, the fastening elements can extend from the outer wall region radially inwards to a center axis of the retaining component and / or be formed as pins.

Figur 1

eine perspektivische Ansicht einer Anordnung mit Kronenmutter, Splint und Gewindestange;

Figur 2

eine perspektivische Ansicht einer Vorrichtung zum Biegen eines Splints;

Figur 3

eine weitere perspektivische Ansicht der Vorrichtung zum Biegen eines Splints;

Figur 4

eine Detailansicht eines Haltebauteils der Vorrichtung zum Biegen eines Splints;

Figur 5

eine Detailansicht eines Werkzeugkörpers der Vorrichtung zum Biegen eines Splints;

Figur 6

eine Detailansicht einer Schubstange der Vorrichtung zum Biegen eines Splints; und

Figur 7

eine Detailansicht eines Biegeelements der Vorrichtung zum Biegen eines Splints.

The preferred embodiments and features of the invention described above can be combined with one another as desired. Further details and advantages of the invention will be described below with reference to the accompanying drawings. Show it:

FIG. 1

a perspective view of an arrangement with castellated nut, split pin and threaded rod;

FIG. 2

a perspective view of a device for bending a splint;

FIG. 3

another perspective view of the device for bending a splint;

FIG. 4

a detail view of a holding member of the device for bending a splint;

FIG. 5

a detailed view of a tool body of the device for bending a splint;

FIG. 6

a detailed view of a push rod of the device for bending a splint; and

FIG. 7

a detailed view of a bending element of the device for bending a splint.

The embodiments shown in the figures are at least partially identical, so that similar or identical parts are provided with the same reference numerals and to the explanation of which reference is also made to the description of the other embodiments or figures in order to avoid repetition.

The FIG. 1 shows a castle nut 2, a split pin 4 and a threaded rod or screw 6th

The castellated nut 2 has an internal thread for unscrewing onto the threaded rod 6. The castle nut 2 is used to attach a component (not shown) on the threaded rod 6. The castle nut 2 also has a crown portion 7 with a plurality of mutually spaced recesses 8 (six recesses in the example of FIG. 1 ) for performing the splint 4. The crown nut 2 may additionally have a main body portion 10 which is formed as an external hexagon.

The split pin 4 has a sapwood head 12, a first leg 14 and a second leg 16. The splint head 12 connects the first leg 14 and the second leg 16. The first leg 14 and the second leg 16 are of different lengths. The first leg 14 and the second leg 16 may together define a round cross-section. The sapwood head 12 has a substantially circular loop shape. In particular, the split pin 4 can be a standard pin according to DIN EN ISO 1234.

To non-rotatably connect the castle nut 2 with the threaded rod 6, the split pin 4 can be used. The first and second legs 14, 16 of the split pin 4 can be guided by two recesses 8 of the crown portion 7 and a transverse bore through the threaded rod 6. Subsequently, the respective ends of the legs 14 and 16, which are opposed to the sapwood head 12, are bent to secure the split pin 4. The spline ends are bent so as to abut against the outer circumferential surfaces 7A and 7B.

According to a conventional technique, the splint ends of the legs 14 and 16 can be machined, for example, with a hammer for bending. This is accompanied by a risk of injury through the use of the hammer and different qualities when bending the splint ends.

The Figures 2 and 3 show a device 18 for bending the splint ends of a splint in two different views (obliquely from above and obliquely from below). The device 18 has a holding component 20, a tool body 22, a push rod 24 and a bending element 26. Before the interaction of the individual components of the device 18 is described, first the individual components with reference to the FIGS. 4 to 7 described in more detail.

The FIG. 4 shows the holding member 20. The holding member 20 is formed as a turntable. The holding member 20 allows the fixing / holding of the splint 4 and the castle nut 2 (see FIG. 1 ) while bending the splinter ends.

The holding member 20 has a plate portion 28, an outer wall portion 30, a holder 32, fastening elements 34 and a pivot 36.

The plate portion 28 has a recess for receiving an over the castle nut 2 also extending end of the threaded rod 6 (see FIG. 1 ) on. The outer wall region 30, the holder 32 and the fastening element 34 on the one hand and the pivot pin 36 on the other hand are arranged on opposite sides of the plate region 28. The plate region 28 may, for example, have a circular shape.

The outer wall portion 30 is formed as a ring segment. The outer wall region 30 may be formed such that the castellated nut 2, in particular the crown section 7, can be partially enclosed (surrounded).

The holder 32 is attached to the outer wall portion 30, for example, pressed. The holder 32 serves to hold the sapwood head 12 during the bending of the cotter pin 4 (see FIG FIG. 1 ). In particular, the holder 32 can be inserted into the loop formed by the splint head 12. In other words, the sapwood head 12 can be placed on the holder 32. Thus, the split pin 4 can be held by the holding member 20.

Starting from the outer wall region 30, the fastening elements 34 extend radially inwardly toward a center axis of the holding component 20. The fastening elements 34 are designed to fit into the recesses 8 in the crown portion 7 of the castle nut 2 (see FIG FIG. 1 ) intervene. Thereby, the holding member 20 can be temporarily fixed or fixed to the castle nut 2. The fasteners 34 are formed, for example, as pins which are fixed in openings in the outer wall portion 30, for example screwed or pressed.

In the embodiment shown, the holding member 20 has two fastening elements 34. In other embodiments, more or fewer fasteners may be included.

The held by the holder 32 on the sapwood pin 12 4 (see FIG. 1 ) may extend through a recess 37 in the outer wall region 30.

By means of the pivot pin 36, the holding member 20 rotatably on the tool body 22 (see Figures 2 . 3 and 5 ) be stored. The pivot 36 may have a threaded portion (not shown). The threaded portion may be disposed on an end of the pivot 36 opposite the plate portion 28.

The FIG. 5 shows the tool body 22. The tool body 22 has a first grip part 38, a second grip part 40, an intermediate element 42 and a boom 44.

The tool body 22 works according to the known principle of the locking pliers (grip pliers). In some embodiments, the tool body 22, as well as the locking pliers, may be detected in a tightening condition and released from a tightening condition.

The first grip part 38 is pivotally connected to the intermediate element 42 via a first pivot axis 46. The intermediate element 42 is connected to the second grip part 40 via a second pivot axis 48. The second handle part 40 is also connected via a deflection (not shown) with the first handle part 38, so that when merging the handle parts 38, 40, the intermediate member 42 in the direction of the boom 44 pivots (principle of the locking tongs). A support of the deflection (not shown) on the first handle part 38 via a sliding bolt 56 in the interior of the first handle portion 38. The (axial) position of the sliding bolt 56 (and thus the opening width between the intermediate member 42 and the boom 44) can be connected via a Lock nut 58 can be adjusted as with an adjustable locking pliers. About a third pivot axis 50, the push rod 24 (see Figures 2 . 3 and 6 ) pivotally connected to the intermediate element 42. The pivot axes 46, 48 and 50 are spaced and parallel to each other. The first and second pivot axes 46 and 48 may include, for example, rivet connections.

The boom 44 has a slot 52 and a receptacle 54. The slot 52 is formed as a through hole. In the assembled state, the pivot pin 36 of the holding member 20 extends (see FIG. 4 ) through the slot 52. The holding member 20 is thus displaceable along a longitudinal direction of the elongated hole 52. The receptacle 54 serves to secure the flexure 26. The cantilever 44 may further include two through holes 55 each extending from an outer peripheral surface of the cantilever 44 to an outer surface of the receptacle 54. In the through holes 55, for example, a dowel pin for fixing the bending element 26 (see FIG. 7 ) are used.

The FIG. 6 shows the push rod 24. The push rod 24 connects the pivot pin 36 of the support member 20 (see FIG. 4 In particular, in an assembled state, the third pivot axis 50 can be pivotably mounted in a first opening 57 of the push rod 24. The pivot pin 36 may be mounted in a second opening 59 of the push rod 24. The first opening 57 and the second opening 59 are disposed at opposite ends of the push rod 24.

The FIG. 7 shows the bending element 26. The bending element 26 may have a bending portion 60 and a fixing portion 62.

The bending element 26 is configured to rotate in the receptacle 54 of the tool body 22 (see FIG. 5 ) to be attached

At the bending section 60, the splint ends of the split pin 4 (see FIG. 1 ) are bent over. For this purpose, the bending section 60 has a bending edge 64, a first bending surface 66 and a second bending surface 68. The bending edge 64 connects the two bending surfaces 66 and 68. The bending edge 64 extends in a longitudinal direction of the bending element 26. The bending edge 64 and the bending surfaces 66, 68 can be milled, for example. The bending surfaces 66 and 68 may include a right angle.

The bending element 26 can via the attachment portion 62 on the tool body 22, in particular in the receptacle 54 (see FIG. 5 ). The attachment portion 62 may include a hole (through hole) 70 for receiving the tension pin for attaching the flexure 26 to the tool body 22. The hole 70 may be drilled, for example.

The Figures 2 and 3 show the device 18 in the assembled state. In particular, the push rod 24 is connected via the third pivot axis 50 and a connecting element 71, for example a screw, pivotally connected to the intermediate element 42.

The holding member 20 is rotatably supported in the tool body 22 and in the push rod 24, and is axially (in a longitudinal direction of the pivot pin 36 (see FIG FIG. 4 )). The connecting element 72 may, for example, a threaded portion of the pivot 36 (see FIG. 4 ) be screwed.

The holding member 20 is further along a longitudinal direction of the arm 44 within the elongated hole 52 (see FIG. 5 ) displaceable. A displacement of the holding member 20 may be effected by merging (tightening, tightening) the first and second gripping members 38, 40. In detail, a pivoting of the intermediate element 42 in the direction of the boom 44 is effected by the described deflection. As a result, the push rod 24 shifts the support member 20 toward the flexure 26. When the engagement between the first and second handle members 38, 40 is released, the intermediate member 42 pivots away from the cantilever 44. The push rod 24 displaces the support member 20 in a direction opposite to the bending element 26.

To bend the splint 4 (see FIG. 1 ), the procedure is as follows. The splint ends of the legs 14 and 16 are bent apart so far that the bending element fits between them. The device 18 is placed on the castle nut 2. Here, the fastening elements 34 of the holding member 20 engage in the recesses 8 of the castle nut 2. The holder 32 of the holding member 20 engages in the sapwood head 12 of the cotter pin 4th

The handle parts 38 and 40 are brought together (stretched). The holder 32 is displaced in the direction of the bending element 26. The bending element 26 is located between the splint ends of the split pin 4. The attached device 18 can now be pivoted in a first circumferential direction about the longitudinal axis of the threaded rod 6. Here, the holding member 20 rotates due to the mesh with the split pin 4 and the castle nut 2 not with. As a result, the bending element 26 deflects a first splint end of the split pin 4 during pivoting. The splint end abuts against the outer circumferential surface 7A, for example. The grip parts 38 and 40 can be released and the device 18 can be pivoted back into the basic position. The gripping members 38 and 40 may be recombined and the device 18 pivoted in a second circumferential direction opposite the first circumferential direction. Here, the second splint end is bent by the bending element 26 and applies, for example, to the outer peripheral surface 7B.

The device 18 can be used, for example, to secure a castellated nut for fastening the trailer coupling in a commercial vehicle, for example a lorry or bus.

Those skilled in the art will recognize, however, that the principle of the apparatus disclosed herein by way of example for bending the cotter pin with the rotatable support is also applicable to the bending of cotter pins which are not used to secure a cradle nut. The device can be modified so that the holder is then supported for example on one or more other surfaces of the component to be secured, so that a relative rotation between the holder and the tool body for bending the splint is made possible. It is, for example, also possible to provide the device without the mechanism for axially displacing the holding member.

The invention is not limited to the preferred embodiments described above. Rather, a variety of variants and modifications is possible, which also make use of the inventive idea and therefore fall within the scope. In particular, the invention also claims protection of the subject matter and the features of the subclaims independently of the claims referred to.

LIST OF REFERENCE NUMBERS

2

castellated nut

4

cotter

6

threaded rod

7

crown portion

7A, 7B

Outer peripheral surface of the crown section

8th

recess

10

Main body portion

12

pin head

14, 16

leg

18

Splintbiegevorrichtung

20

holding member

22

tool body

24

pushrod

26

flexure

28

plate area

30

Exterior wall area

32

bracket

34

fastener

36

pivot

37

recess

38

First handle part

40

Second handle part

42

intermediate element

44

boom

46

First pivot axis

48

Second pivot axis

50

Third pivot axis

52

Long hole

54

admission

55

Through Hole

56

sliding bolts

57

opening

58

locknut

59

opening

60

bending section

62

attachment section

64

bending edge

66

First bending surface

68

Second bending surface

70

hole

71.72

connecting member

Claims (15)

Device (18) for bending a cotter pin (4) for securing the position of a workpiece (2), in particular for preventing rotation of a nut, preferably a castellated nut, comprising: a tool body (22); a holding member (20) for holding the split pin (4) during a bending operation, the holding member (20) being rotatably supported on the tool body (22); and a bending element (26) which is arranged on the tool body (22) such that one end of a cotter pin (4) held on the holding component (20) is rotated relative to the bending element (26) by a relative rotation between the holding component (20) and the tool body (22) ), in particular form-flush to the workpiece (2), is bendable. The device (18) of claim 1, wherein: a first splint end of the split pin (4) can be bent by a relative rotation between the tool body (22) and the holding component (20) in a first direction of rotation on the bending element (26); and a second splint end of the split pin (4) is deflectable by a relative rotation between the tool body (22) and the holding member (20) in a second direction of rotation opposite to the first direction of rotation, to which the bending element (26) is bendable. Device (18) according to claim 1 or claim 2, wherein: the holding member (20) holds the split pin (4) against a split pin head (12) of the split pin (4); and or the holding member (20) has a holder (32) for holding a sapwood head (12) of the split pin (4), wherein the holder (32) is designed in particular as a pin or projection. Device (18) according to one of the preceding claims, wherein the holding member (20) during the relative rotation between the holding member (20) and the tool body (22) rotatably on the workpiece (2) is securable. Device (18) according to one of the preceding claims, wherein: the holding component (20) is designed to engage with the workpiece (2) designed in particular as a nut, preferably a castellated nut, for non-rotatable securing of the holding component (20) on the workpiece (2), and / or the holding component (20) has at least one fastening element (34) for the non-rotatable securing of the holding component (20) on the workpiece (2). Device (18) according to claim 5, wherein the at least one fastening element (34) for engaging in at least one recess (8) in a crown portion (7) of the formed as a castle nut workpiece (2) is formed. Device (18) according to one of the preceding claims, wherein the holding member (20) is designed as a turntable and the turntable in particular as a ring segment, in particular half-ring segment, formed outer wall portion (30). Apparatus (18) according to claim 7, wherein: the outer wall region (30) is arranged on a side of the holding component (20) facing away from the bending element (26); and or the outer wall region (30) is designed to partially enclose the workpiece (2), in particular the castellated nut. Device (18) according to claim 7 or claim 8, wherein the outer wall region (30) has a recess (37) for passing through the splint (4), in particular a splint section adjoining a splint head (12) of the splint (4). Device (18) according to one of claims 3 to 9, wherein the holder (32) and / or the recess (37) on a bending element (26) facing away from the holding member (20) is arranged. Device (18) according to one of the preceding claims, wherein: the holding member (20) is slidably mounted on the tool body (22), so that in particular a distance between the holding member (20) and the bending element (26) is variable; and or the tool body (22) has a slot (52) in which the holding member (20) is slidably mounted, so that in particular a distance between the holding member (20) and the bending element (26) is variable. Device (18) according to one of the preceding claims, further comprising a mechanism for converting a pivoting movement between two gripping parts (38, 40) the tool body (22) to a translational movement of the holding member (20) in particular in a direction to or away from the bending element (26). Device (18) according to one of the preceding claims, wherein the holding member (20) is connected to a push rod (24) for displacing the holding member (20). The device (18) of claim 13, wherein: the tool body (22) has a first handle portion (38) and a second handle portion (40) pivotally connected to the first handle portion (38); and a pivoting of the second handle part (40) to the first handle part (38) causes a displacement of the holding member (20) to the bending element (26) by means of the push rod (24). Device (18) according to one of the preceding claims, wherein the bending element (26) is formed as a pin, preferably a bending edge (64) and two in particular planar bending surfaces (66, 68) which are interconnected via the bending edge (64) , having.

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