DE102013008653A1 - Method and tool for setting blind rivet nuts - Google Patents

Abstract

The invention relates to a method for setting blind rivet nuts and a setting tool for performing the method. The method according to the invention is characterized in that after a setting hole has been drilled in a component (30) into which the blind rivet nut (41) is mounted, the blind rivet nut (41) is screwed onto a screw insert (4) used in the screwing device (1) without deformation , the collar (43) of which lies in a bed (23) of a centering attachment (21) arranged on the screw insert (4) and is thus inserted into the prepared setting hole in the component (30) or the screw insert (4) with centering attachment (21) is screwed into the blind rivet nut (41) located in the setting bore, the centering attachment (21) resting with its underside on the component and the blind rivet nut (41), centering attachment (21) and screw insert (coaxial to the setting axis (35) 4) align orthogonally to the component (30) and by actuating the screwing device (1) in the tightening direction of the blind rivet nut during the screwing movement of the shaft (42) of the blind rivet nut he (41) with compression and formation of a bead (49) in the region of the compression zone (48) is pressed against the underside of the component. The setting tool with a screwing device (1) for blind rivet nuts (41), which has a collar (43), a shaft (42) with an internal thread (46) extending below the collar (43) and the shaft (42) preferably above the thread Compression zone (48) located for performing the method is characterized in that it comprises a screw insert (4) with a centering attachment (21) receiving the collar (43) of the blind rivet nut (41). The invention is characterized in that the setting process compared to the prior art, in which an axial movement is additionally required, is carried out only by a rotational or rotational movement of the tool.

Description

The invention relates to a method for setting blind rivet nuts according to the preamble of claim 1, as well as a setting tool for carrying out the method according to the preamble of claim 2.

Threaded rivets are often referred to as threaded nut nuts. The correct name of these fasteners is blind rivet nut or blind rivet, whereby the term rivet nut is also used.

Blind rivet nuts are used when the bottom, inside or back of a component is not accessible, as z. B. occurs in pipes. Mounting threads can be attached to components that are too thin in wall thickness and are not suitable for cutting threads.

The blind rivet nuts are processed with hand tools or electrically operated machines according to the spindle-stroke principle, wherein a spindle-shaped deformation of the blind rivet nut and a subsequent uncoupling takes place.

In the DE 43 00 190 A1 is a device for setting of Gewindietietmuttern known. The device is used for setting Gewindietietmuttern with a fluid-operated rotary motor, which sets for turning a Gewindindeietmutter on a threaded spindle of the device in the right direction. The device further comprises a compression process operating, pressure-medium-operated thrust device, which gives the threaded spindle for the upsetting operation of the Gewindietietmutter an axial movement. Furthermore, a separate actuator in the form of a reversing valve is provided which redirects the pressure medium supply and thus gives the rotary motor a left-hand rotation, wherein the threaded spindle, the thrust device as a piston, the rotary motor and the reversing valve are axially connected.

In the DE 32 15 468 A1 a rivet setting for threaded rivet nuts is described in which the unwinding of the Gewindietietmutter is effected by a touchdown with pressure of the device, wherein the rotational movement automatically shuts off when the Gewindietietmutter comes to a stop for abutment. For the compression process, a feed device is responsible, which gives the threaded bolt an axial movement.

All known setting tools use an axial movement to the rivet shank to upsetting and so complete the setting process, whereby the threaded spindle exert tensile forces on the rivet thread, which can lead to an impairment of the thread function capability.

The known tools also have the disadvantage that the blind rivet nut is not positioned exactly in the setting axis and is often damaged by a tilting the thread. If the longitudinal axis of the blind rivet nut is not perpendicular to the component, this also results in a later inclination of the attachments result. This not infrequently means that the installers responsible for attaching parts try to correct the fit of the blind rivet nut with the component to be adapted. This results in a relaxation of the riveted joint.

Accordingly, it is an object of the invention to propose a method for the optimal and tilt-free setting of blind rivet nuts, as well as a setting tool for performing this method.

This object is achieved by a method having the features of the proposed claim 1 and a setting tool with the features of the proposed claim 2.

Further features of the invention are described in the subclaims.

According to the invention, a method for setting blind rivet nuts having a collar, an internally threaded shank extending below the collar, and the shank having a compression zone preferably above the thread is proposed.

The method according to the invention is characterized in that after inserting a setting hole in a component in which the blind rivet nut is mounted, the blind rivet nut is turned onto a screw insert used in the screwdriver without deformation, this with its collar in a bed of arranged on the screw insert centering attachment comes to rest and is inserted into the prepared setting hole in the component, the centering rests with its underside on the component and align the coaxial with the setting axis blind rivet, the centering attachment and the screw orthogonal to the component and by activating the tightening direction of the screwdriver during the Screwing the shaft of the blind rivet nut is compressed under compression and formation of a bead in the region of the compression zone to the underside of the component is pressed. It is not mandatory that the blind rivet nut screwed onto the screw insert is inserted into the setting hole. There is also the possibility of the blind rivet nut first in the Insert setting hole loosely and then screw in the screw insert with centering device into the blind rivet nut.

The result of the setting process is an exact riveting, in which the rivet axis is aligned coaxially to the setting axis. Alone by the screwing the riveting process is performed in cooperation with the back pressure of the centering, without tool or machine parts have to perform an axial stroke movement. By counteracting the centering the blind rivet nut is prevented from turning with the threaded pin of the screw. After the threaded pin of the screw has passed through the thread of the blind rivet nut, the rivet shank is pushed upwards in the continuing rotation of the screw, whereby the centering and thus the blind rivet nut not rotate. The fact that is achieved with the invention that the blind rivet nut is completely inserted without jamming in the component, the thread can not be damaged. Mounting parts, which serve the thread of the blind rivet nut for attachment, can be fixed with the correct correct orientation of the component in question, since the insertion of the blind rivet nut also takes place exactly.

The invention is characterized in that the setting process over the prior art, in which an additional axial movement is required, only by a rotational or rotational movement of the tool.

The process can be performed manually or by machine. Preferably, an electric screwdriver is used as a tool. The tightening direction of the blind rivet nut is understood to mean the direction in which the blind rivet nut is pressed against the underside of the component under compression and formation of a bead in the area of the compression zone. Depending on the application, blind rivet nuts with right- or left-hand thread can be used here. Accordingly, the setting tool, possibly a cordless screwdriver z. B. operated with clockwise or a manual tool used by left or right rotation accordingly. A blind rivet nut is the representative name for fasteners with internal thread, which can be set by the proposed device. This can be z. B. also be a suitably designed and according to the application suitable application cavity dowel.

To carry out the method according to the invention, a setting tool with a screwing device is proposed for such blind rivet nuts, which have a collar, a shaft extending below the collar with an internal thread, and the shaft a compression zone located preferably above the thread.

The setting tool according to the invention is characterized in that the setting tool comprises a screw insert with a centering attachment receiving the collar of the blind rivet nut. Again, optionally, a manual tool or the method can be performed with an electrically operated tool.

The invention is particularly suitable in combination with a Handakkuschrauber and can be used almost at all workstations. The setting process can be carried out in a few seconds and requires no effort. After completion of the setting process, the screwdriver by reverse rotation, z. B. removed by counterclockwise rotation of the blind rivet nut. Even if the fitter does not align the helicopter exactly, this is urged by means of the support surface of the centering attachment perpendicular to the component to be machined.

For this purpose, it is preferably provided that the screw insert comprises a grub screw engaging in the internal thread of the blind rivet nut. The threaded pin has a corresponding to the blind rivet nut used external thread.

Screw insert and centering attachment may be formed as a component, but are freely rotatably assembled against each other, or even, as a particularly preferred embodiment of the invention provides, be designed so that the centering attachment is placed on the screw and each penetrated by the threaded pin. As a result, the centering attachment does not rotate with it.

Alternatively, the centering attachment can also be adapted to the screw insert by means of a bearing, preferably a ball bearing, which has a positive effect on working with the setting device because of the counterforce control resulting therefrom.

In a further particularly preferred embodiment of the invention it is provided that the centering attachment has on its underside remote from the screwing device a bed substantially corresponding to the geometry of the collar of the blind rivet nut. This causes the collar and thus the entire blind rivet nut can not escape, because the centering spatially offers no possibility for this purpose. The depth of the bed corresponds to the collar height of the blind rivet nut.

This is supported by the fact that the bed of the centering attachment is surrounded by a support surface. With this contact surface forms the Centering attachment with the component in which the blind rivet nut is mounted, a parallelism. This results almost automatically a vertical orientation of the used screwdriver, without the user could commit a mounting error here.

A particularly preferred embodiment of the invention provides that the screw with threaded pin and Zentriervorsatz are designed as interchangeable modules. This allows different sizes of blind rivet nuts to be used and these can be processed simply by replacing the appropriate tool modules.

In order to prevent rotation of the centering attachment during the setting process, the invention provides in a particularly preferred embodiment, that the centering attachment has a tool attack. As a result, the centering attachment can be secured against twisting with a ring spanner, which the user holds in place during the setting process. A handle knob arranged on the centering attachment can alternatively be used for this purpose.

There are various possibilities for designing and developing the teaching of the present invention in an advantageous manner. For this purpose, on the one hand to refer to the subordinate claims and on the other hand to the following explanation of an embodiment of the invention with reference to the drawings. In conjunction with the explanation of the preferred embodiment of the invention with reference to the drawing, also generally preferred embodiments and developments of the teaching are explained.

The invention will be described below with reference to the drawings with reference to a preferred embodiment.

In the drawings show:

1 the tool according to the invention with its individual components in an exploded view,

2 a perspective view of a blind rivet nut,

3 a side view of the blind rivet nut according to 2 in a half section,

4 a screw insert,

5 a side view of an intermediate ring,

6 a top view of the intermediate ring,

7 a bottom view of the intermediate ring,

8th a side view of a centering attachment,

9 a bottom view of the centering attachment,

10 the centering attachment with inserted blind rivet nut,

11 the tool according to the invention in an assembled situation in use,

12 this in 11 with XII marked detail in an enlargement,

13 the cavity plug in the installed state,

14 the ball bearing centering attachment with a handle knob instead of a tool attack and

15 a transport case containing the system parts.

1 shows the invention with spaced apart individual elements. With 1 is a hand screwdriver with a chuck 2 designated. A screwdriver bit 4 , which is suitable in the chuck 2 the hand-wrench 1 to be used, follow an intermediate ring 11 , a centering attachment 21 and the blind rivet nut to be processed 41 ,

In 2 and 3 is the blind rivet nut 41 displayed. It has a shaft 42 and a collar 43 , The shaft 42 and the collar 43 are from a channel 44 interspersed, the near the collar 43 in a widened area 45 passes. The narrower channel area underneath is with an internal thread 46 designed. The one between the collar-close end 47 of the thread and the collar 43 lying thread-free section forms a compression zone 48 ,

In 4 is a screwdriver 4 displayed. The screw insert 4 is a pin with a cylindrical approach 5 which is inserted into the chuck's chuck. At its opposite free end has the screw 4 a grub screw 6 , The external thread on it 7 corresponds to the size of the internal thread of the blind rivet nut to be processed and has at the transition to the pen body a thread-free section 8th on.

The in the 5 - 7 pictured intermediate ring 11 serves as a spacer between centering attachment 21 and screw insert 4 , Of the intermediate ring 11 can also be designed as a sliding or roller bearings and connected to the centering attachment. It serves for trouble-free rotation of the screw insert 4 opposite the static centering attachment 21 , The intermediate ring 11 includes a cone-shaped disc 12 in a cylindrical approach 13 goes over disk 12 and approach 13 are from a circular cylindrical bore 14 interspersed.

The in 8th - 10 pictured centering attachment 21 has a bed on its underside 23 in which the collar 43 the blind rivet nut 41 to come to rest. The centering attachment 21 is from a central hole 22 interspersed. The bed 23 is from a plane bearing surface 24 surround. To prevent co-rotation during the setting process, has the centering attachment 21 on its outer contour a tool attack 26 to set, for example, with a ring spanner. Alternatively, a handle knob 28 ( 14 ).

The assembly of the blind rivet nut 41 on or on a designated component, is referred to as setting process and is in the 11 - 13 resist given. For this purpose, the screw is used 4 with its cylindrical approach 5 in the chuck 2 the hand-wrench 1 used and rotatably enclosed. After the intermediate ring 11 and the centering attachment 21 with his bed 23 from the hand screwdriver 1 pointing the way to the threaded pin 6 of the screw insert 4 are manually attached, the blind rivet nut 41 on the grub screw 6 by carefully turning the wrench with clockwise rotation. If the blind rivet nut 41 with her collar 43 correct in centering attachment 21 is sitting, the so prepared apparatus on the with 30 designated plate placed in the already a the diameter of the rivet shank corresponding opening 32 is provided.

The centering attachment 21 now sits with his support surface 24 plan on the plate 30 so that the setting process in an exact orthogonal relationship, ie including a right angle between plate 30 and setting axis 35 he follows.

With a tool, preferably a fork wrench, the centering attachment 21 secured against turning. After the grub screw 6 of the screw insert 4 the internal thread 46 the blind rivet nut 41 has passed through the blind rivet nut 41 against the crown 25 ( 8th ) of the bed 23 pulled while the shaft 42 compressed. Through the thread-free compression zone 48 ( 3 ) remains the internal thread 46 even undeformed, so that the grub screw 6 Turn in here and after the blind rivet nut 41 through the formation of a bead 49 ( 13 ) firmly on the plate 30 anchored by turning counterclockwise.

The invention prevents a rotation of the blind rivet nut caused by the frictional engagement force, so that the thread of the screw insert can work through the thread of the blind rivet nut and subject it to axial movement solely by the screwing movement, whereby the crushing or compressing zone appears as a deliberate and controlled weak point deformed into a bead.

The 14 shows in addition to the embodiment of the centering attachment 21 with a handle knob 28 instead of a Werkzeuganfgriffs still a camp 51 with the centering attachment 21 is arranged on the screw, resulting in an optimal balance of forces between axial and frictional force.

As a result, the invention achieves that the blind rivet nut is inserted into the component while retaining an exact orthogonal setting axis and that the internal thread in the blind rivet nut is unimpaired in terms of its quality of use.

The 15 shows a transport case 60 , Here are cavity dowels 41 . 41a . 41b . 41c in different sizes. Further fasteners 65 . 65a . 65b . 66 . 66a . 66b in different designs and sizes. These can be as shown here eyebolts, hook bolts or differently designed headboards 69 be that with their threaded shank 68 be screwed into the cavity dowel.

With 4 . 4a and 4b are threaded inserts with different setscrews 6 for the different cavity dowels. Likewise, according to the variety of dowels a matching selection of centering attachments 21 . 21a . 21b and 21c in the transport case 60 maintained.

The fork wrench 70 serves to secure the Zentriervorsatzes against rotation, if no other aids attached to this. As a tool is in the case a hand screwdriver 1 with removable battery 75 and charger 77 ,

LIST OF REFERENCE NUMBERS

1

Handschrauber

2

Chuck of 1

4

screw insert

5

cyl. Approach of 4

6

Grub screw from 4

7

External thread on 6

8th

Thread free section of 6

11

intermediate ring

12

conical disk of 11

13

Approach of 11

14

Bore in 11

21

Zentriervorsatz

22

Bore in 21

23

Bed in 21

24

Bearing surface of 21

25

Vertex of 23

26

Tool attack on 21

28

handle knob

30

Part / plate

32

Breakthrough in 30

35

setting axis

41

blind rivet nut

42

Shank of 41

43

Collar of 41

44

channel from 41

45

expanded area of 44

46

Internal thread of 44

47

Threaded end of 46

48

Compression zone of 41

49

Bead of 41

51

Warehouse for 21

60

Carrying case

65

fastener

66

fastener

68

Threaded shaft of 65 . 66

69

Headboard of 65 . 66

70

end wrench

75

removable battery

77

charger

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4300190 A1 [0005]
• DE 3215468 A1 [0006]

Claims (10)

Method for setting blind rivet nuts ( 41 ), which has a collar ( 43 ), one below the collar ( 43 ) extending shaft ( 42 ) with internal thread ( 46 ) and the shaft ( 42 ) a preferably located above the thread compression zone ( 48 ), characterized in that after introduction of a setting hole in a component ( 30 ) in which the blind rivet nut ( 41 ), the blind rivet nut ( 41 ) on a screwdriver ( 1 ) inserted screw insert ( 4 ) is turned up without deformation, this with its collar ( 43 ) in a bed ( 23 ) one on the screw ( 4 ) arranged centering attachment ( 21 ) comes to rest and so in the prepared setting hole in the component ( 30 ) or the screw insert ( 4 ) with centering attachment ( 21 ) in the blind bore located in the setting hole ( 41 ) is screwed, wherein the centering attachment ( 21 ) rests with its underside on the component and the coaxial with the setting axis ( 35 ) located blind rivet nut ( 41 ), Centering attachment ( 21 ) and screw insert ( 4 ) orthogonal to the component ( 30 ) and by pressing the screwdriver ( 1 ) in the tightening direction of the blind rivet nut during the screwing movement of the shaft ( 42 ) of the blind rivet nut ( 41 ) under compression and formation of a bead ( 49 ) in the region of the compression zone ( 48 ) is pressed against the underside of the component. Setting tool with a screwdriver ( 1 ) for blind rivet nuts ( 41 ), which has a collar ( 43 ), one below the collar ( 43 ) extending shaft ( 42 ) with internal thread ( 46 ) and the shaft ( 42 ) a preferably located above the thread compression zone ( 48 ), for carrying out the method according to claim 1, characterized in that the setting tool a screw insert ( 4 ) with a collar ( 43 ) of the blind rivet nut ( 41 ) receiving centering attachment ( 21 ). Setting tool according to claim 2, characterized in that the screwing device is an electrically operated device, preferably a cordless screwdriver. Setting tool according to one of the preceding claims, characterized in that the screw insert ( 4 ) into the internal thread ( 46 ) of the blind rivet nut ( 41 ) engaging threaded pin ( 6 ). Setting tool according to one of the preceding claims, characterized in that the centering attachment ( 21 ) on the screw insert ( 4 ) and its threaded pin ( 6 ) is interspersed. Setting tool according to one of the preceding claims, characterized in that the centering attachment ( 21 ) on his the screwdriver ( 1 ) Far underside of a substantially the geometry of the collar ( 43 ) of the blind rivet nut ( 41 ) corresponding bed ( 23 ) having. Setting tool according to one of the preceding claims, characterized in that the bed ( 23 ) of the centering attachment ( 21 ) from a support surface ( 24 ) is surrounded. Setting tool according to one of the preceding claims, characterized in that the screw insert ( 4 ) with threaded pin ( 6 ) and centering attachment ( 21 ) are designed as interchangeable modules. Setting tool according to one of the preceding claims, characterized in that the centering attachment ( 21 ) has a sliding or ball bearing, with which it on the screw ( 4 ) is adapted. Setting tool according to one of the preceding claims, characterized in that the centering attachment ( 21 ) a tool attack ( 26 ) having.

Images