EP3840900A1

EP3840900A1 - Thread roughing device

Info

Publication number: EP3840900A1
Application number: EP20744003.3A
Authority: EP
Inventors: Luca Nico HEIL
Original assignee: Lacuni Ug Haftungsbeschraenkt
Current assignee: HEIL, LUCA
Priority date: 2019-07-19
Filing date: 2020-07-16
Publication date: 2021-06-30
Also published as: DE102019133767A1; WO2021013692A1

Abstract

The invention relates to a thread roughing device (10) having at least two first rollers (36, 37) mounted on a carrier (30) and at least one further roller (46) mounted on a movable component (40). For easier operation, the invention provides that the further roller (46) is movable in the direction of the first rollers (36, 37) by means of a contact pressure device (40) that is loaded by a spring (26) and is mounted in a movable manner.

Description

Thread roughening device

The invention relates to a thread roughening device according to the preamble of patent claim 1.

In the installation trade, fibers made of hemp are still preferred to seal thread connections on the external thread. So that these fibers adhere to the thread grooves when they are joined, the thread is roughened before the fibers are inserted. The roughening of the thread is still very often done with a hacksaw. This process is cumbersome and time-consuming and carries the risk of injury to people and material.

From DE 37 23 361 A1 a pliers-like thread-roughening device is be known, in which two rollers are arranged on a first lever of the pliers and opposite one another role on the second lever of the pliers. Although this known thread-roughening device already has clear advantages over roughening by means of a hacksaw, the handling is awkward there too, since the two levers of the pliers have to be gripped with both hands and pressed together, which requires that the thread otherwise from one Clamping device or another operator is held. The object of the invention is to create a thread-roughening device which enables simplified one-handed operation.

This object is achieved according to the invention by a thread roughening device having the features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

With the present invention it is possible to ensure simple, one-handed operation by resiliently preloading at least one additional roller by means of a resiliently movably mounted pressure device. Due to the displaceable mounting of the pressing device, simple adaptation to different thread diameters is nevertheless possible.

A first advantageous embodiment of the invention provides that the pressing device and the compression spring are mounted in a housing of an ergonomically designed handle that can be handled by hand.

According to an advantageous further development of the invention it is provided that the pressing device can be moved by means of a slide. The slide is preferably also ergonomically designed and arranged so that it can be operated by the thumb of the hand holding the handle.

The slide is preferably guided in a slot in the housing of the handle. It is connected on the inside to the pressure device and is guided through the slot out of the interior of the housing, so that it can be actuated there by means of the thumb against the pressure of the spring.

The length of the slot in the housing is preferably chosen so that a movement of the slide for setting the further roller on differently large diameters of a thread is possible. The spring is designed accordingly, so that it exerts a pressure force on the further roller that is sufficient to roughen the thread over the entire adjustment path of the slide. The pressing device advantageously comprises a ball arranged between the spring and a pressure piece. The further role has a limited ability to adapt to the surface of the thread due to the ball within the freedom of movement made possible by a play between an interior of the housing and the pressing device.

The handle surrounding the housing and the preferably annular carrier are preferably made in one piece, for example as a cast part.

The housing is preferably closable on its side facing away from the carrier by means of a cover. The cover is particularly preferably provided with an external thread which can be screwed into a corresponding internal thread on the interior of the housing. The outside of the cover preferably has a recessed receptacle for the engagement of a tool, not shown, for example a hexagon socket wrench.

The two first rollers are preferably mounted on a common holder, which in turn is attached to the carrier. According to an advantageous development, the holder can also be resiliently mounted on the holder.

According to a second particularly advantageous embodiment, the Ge thread roughening device as a carrier on a support lever on which a Haupthe bel is pivotally attached as part of a pressure device. The main lever is resiliently preloaded by means of a compression spring against the support lever and pivotably connected to a locking lever via a translation gear, which depending on the diameter of the thread can be brought into engagement in several locking positions with a roller bearing lever carrying the other role. Due to the transmission ratios between the compression spring, the support lever and the main lever and the transmission gear preferably formed from a detent bearing lever and a coupling, a multiple of the spring force of the Druckfe can be transmitted as a processing force to the other role. Advantageously, the roller bearing lever is resiliently preloaded by means of a tension spring in the direction of the first rollers, whereby a flexible recording of thread diameters of different sizes is possible. It is also advantageous if the locking lever is resiliently preloaded in the direction of the roller bearing lever by means of a tension spring. This enables an automatic locking of the locking lever.

According to an advantageous further development, the locking lever is in operative connection with an unlocking lever, which in turn is pivotably mounted on the main lever. At its rear end, the release lever has a nose protruding towards the support lever, by means of which the release lever can be brought into a position with the roller bearing lever that automatically disengages the locking lever when the main lever and the support lever are pressed together.

Two exemplary embodiments of the invention are explained in more detail below with reference to the drawings. It shows: FIG. 1 a schematic overall view of a first thread-roughening device according to the invention with an extended pressing device, where the handle is shown transparently to illustrate the pressing device;

Fig. 2 is a schematic overall view according to FIG. 1 with one against the

Force of the compression spring pushed back pressure device;

Fig. 3 is a longitudinal section through the thread roughening device under Andeu device of a thread arranged between the first rollers and the further roller,

4 shows an exploded view of the individual parts of the pressing device, FIG. 5 shows an enlarged view of the further roller to illustrate the toothing attached to its outer circumference, 6 shows a schematic overall view of a second thread-roughening device according to the invention in the working position on a thread with a small diameter,

7 shows the thread roughening device according to FIG. 6 shortly before reaching an unlocking position,

8 shows the thread-roughening device according to FIG. 6 when the unlocking position is reached (with the locking position of a latching lever also being indicated here),

Fig. 9 shows the thread roughening device according to Fig. 8 in engagement with a Ge thread with an average diameter,

Fig. 10 shows the thread roughening device according to Fig. 8 in engagement with a Ge thread with a larger diameter,

11 shows the thread roughening device according to FIG. 8 in engagement with a Ge thread with maximum diameter, and

12 shows the second thread-roughening device according to the invention according to FIGS

Figures 6 to 11 in an enlarged view.

FIG. 1 shows a thread-roughening device 10 which has a handle 20 and a carrier 30 connected to it.

An annular support ring 32 of the carrier 30 is used to support two first Rol len 36 and 38, whose axes 37 and 39 are taken on a common holder 34 fasten. The holder 34 is in turn mounted on the support ring 32 of the carrier 30.

As shown, the holder 34 can be firmly connected to the support ring 32 by rivets 35. Alternatively, the holder 34 can also be mounted on the support ring 32 so as to be resiliently movable.

The handle 20 has a housing 22, the interior 29 of which has an opening provided with an internal thread at the end facing away from the carrier 30, which opening can be closed by means of a cover 23. For this purpose, the cover 23 has an external thread 25 which can be screwed into the unspecified Innenge of the housing 22. The lid 23 is provided on its outside with a recessed receptacle 24 which is not for the engagement of a tool shown - for example a hexagon socket wrench - is used.

In the interior 29 of the housing 22, a pressing device 40 is arranged displaceably with slight play. The pressure device 40 comprises a pressure spring 26 resting on the inside of the cover 24, a pressure piece 41 and a ball 27 arranged between the pressure spring 26 and pressure piece 41. The ball 27 is pressed by the pressure spring 26 against the underside of the pressure piece 41. On the side facing away from the ball 27, the pressure piece 41 has a shaft 42 on which a carrier 43 with a U-shaped cross section is arranged. The carrier 43 is used with two side cheeks 44 to support an axis 45 of a further roller 46, which is movable together with the pressure piece 41 in the diameter of the support ring 32 into the first rollers 36 and 38.

The pressure piece 41 is guided with a certain amount of play in the interior 29 of the housing 22. A slide 48 connected to the guide part of the pressure piece 41 is led out through a slot 28 in the wall of the housing 22. The slide 48 is ergonomically designed and arranged in such a way that it can be displaced by a thumb of a hand enclosing the handle 20 within the distance limited by the ends of the slot 28 at the stirnsei term.

In FIG. 1, the slide 48 rests against the front end of the slot 28 facing the carrier 30. The distance between the first rollers 36 and 38 and the further roller 46 has reached its minimum.

In Fig. 2, the slide 48 is pushed by the thumb of a user, not shown, ge conditions the rear end of the slot 28. The compression spring 26 is compressed to the maximum and the further roller 46 has the maximum possible distance from the first rollers 36 and 38, respectively. In this position, the thread-roughening device 10 with the support ring 32 is pushed over a thread 50 to be roughened, as indicated in FIG. 3. Then the slide 48 is released from the user's thumb, whereby the further roller 46 by means of the compression spring 26 and the pressure piece 41 with a through the characteristic curve of Compression spring 26 predetermined defined contact force against the thread 50 is pressed ge. The user then turns the thread-roughening device 10 around the thread 50, whereby the thread 50 is roughened by means of the further roller 46 provided with teeth 47.

The first two rollers 36 and 38 can be hen with such teeth 47 verses. The tip lines of the teeth 47 can be arranged over the widths of the Rol len 36,38 and 46 seen coaxially or obliquely to the axis of the rollers 36,38 and 46.

As can be seen from FIGS. 1 to 3, the diameter D of the thread 50 can vary over a wide range, so that the thread roughening device 10 according to the invention can be used for very different threads. One-handed operation means that a user - for example an installer in pipeline construction - always has a simple tool that can be handled with one hand and can be used universally for a wide variety of pipe diameters.

In the figures 6 to 12 a second embodiment of the thread roughening device 110 according to the invention is shown. Some reference numbers of these two th embodiment are only in Fig.

12 included. The thread-roughening device 1 10 has as a carrier a Traghe bel 130, at the front end of which two first rollers 136 and 138 are rotatably supported at a distance from one another by means of axes 137 and 139. A main lever 141 of a pressure device designated as a whole by 140 is pivotably connected to the support lever 130 by means of an axle 131.

Between the support lever 130 and the main lever 141, as seen from the lower end to the axis 131, a stop 1301 is provided on the inside of the support lever 130 and overlying a stop 141 1 on the inside of the main lever 141 is provided approximately in the middle. The stops 1301 and 141 1, on the one hand, the limitation of the movement to each other when closing the two levers 130 and 141 and on the other hand as a carrier of a stable compression spring 126. As described further below, the compression spring 126 ensures that the necessary processing pressure of the rollers 136, 138 and 146 is applied to the thread 50.

The main lever 141 is pivotably connected to a detent bearing lever 142 and a roller bearing lever 145 by means of an axle 132. The detent bearing lever 142 is also connected to the main lever 141 by means of a coupling 144. The coupling 144 is pivotably mounted on the main lever 141 by means of an axis 1441 and on the detent bearing lever 142 by means of an axis 1442.

A detent lever 143 is pivotably mounted on the detent bearing lever 142 by means of an axis 1431. At the free end of the roller bearing lever 145 opposite the axis 132, a third roller 146 is rotatably mounted by means of an axis 1461. The roller bearing lever 145 has a spring bearing 1451, for example in the form of a pin, to which a tension spring 1452 is attached with its first end. The second end of the tension spring 1452 is fastened to a spring bearing 1302 which is arranged on the support lever 130. The tension spring 1452 thus exerts a preload on the roller bearing lever 145 and thus on the further roller 146 in the direction of the first rollers 136 and 138. The thread 50 to be roughened can easily be inserted between the rollers 138 and 146 due to the resilient retraction of the roller 146 for the machining process.

A plurality of sawtooth-shaped catches 1455 are provided on the outside of the roller bearing lever 145, spaced apart from one another. The notches 1455 are used for engagement of a cutting edge 1436, which is arranged at the front end of a front lever arm 1432 of the locking lever 143.

As an alternative to the sawtooth-shaped detents 1455 on the roller bearing lever 145, sawtooth-shaped detents 1435 can also be formed on the inner side of the detent lever 143 facing the detent bearing lever 142, which in practice is somewhat longer, of which one of the then corresponding to the diameter D of the thread 50 Notches 1435 with a cutting edge 1453 at the äuße Ren end of the roller bearing lever 145 can be brought into engagement. This variant is in 12 is also indicated, although in practice only one of these alternatives (notches 1455 with cutting edge 1436 or notches 1435 with cutting edge 1453) is used.

The latching lever 143 has a spring bearing 1434 to which one end of a Zugfe 1425 is attached. The other end of the tension spring 1425 is arranged on a spring bearing 1421 that is provided on the detent bearing lever 142. The locking lever 143 is resiliently biased towards the roller bearing lever 145 by the tension spring 1425.

A rear swivel arm 1433 of the locking lever 143 acts with the front swivel arm

1472 of an unlocking lever 147, which is pivotably mounted on the main lever 141 by means of an axis 1471 and on its rear lever arm

1473 has a protruding nose 1474 facing the support lever 130. The rear Flebelarm 1433 of the locking lever 143 is always held in contact with a front Flebelarm 1472 of the Entriegelungshe bel 147 by the tension spring 1425.

When the support lever 130 and the flake lever 141 are pressed together, the nose 1474 of the release lever 147 abuts the lower inside of the lever 130 on the support lever. As a result, the release lever 147 experiences a small counterclockwise movement about its axis 1471, with the front swivel arm 1472 of the unlocking lever 1472 rotating the rear swivel arm 1433 of the locking lever 143 clockwise about its axis 1431 by a small amount, so that the locking lever 143 with its cutting edge 1436 out of engagement with the notches 1451 on the roller bearing lever 145 - or in the alternative embodiment the notches 1435 on the latching lever 143 out of engagement with the cutting edge 1453 on the roller bearing lever 145 -.

To process a thread 50, the thread-roughening device 110 is in a receiving position, ie with the support lever 130 and main lever 141 pressed together in a receiving position in which the nose 1474 does not rest against the Inside of the support lever 130 presses, pushed with the rollers 138 and 146 over the thread 50, the roller 146 yielding against the force of the tension spring 1452 and thereby making the receiving opening between the rollers 138 and 146 flexible and wide.

When the thread 50 is machined, it then rests against all three rollers 136, 138 and 146 in a machining position. For this purpose, the operator loosens the compression of the support lever 130 and the main lever 141, whereby the force F126 (see FIG. 12) of the compression spring 126 pushes the main lever 141 away from the support lever 130 about the axis 1441 in the counterclockwise direction. The detent bearing lever 142 is pivoted about its axis 132 in the counterclockwise sense via the Kop pel 144. The locking lever 143 is pretensioned by the tension spring 1425 with its cutting edge 1451 in engagement with one of the notches 1451 on the outside of the roller bearing lever 145. Which of the notches 1451 engages with the cutting edge 1433 is determined by the position of the roller bearing lever 145, which this has previously assumed by the fe-reducing contact of the roller 146 on the thread 50 caused by the tension spring 1452.

The compression spring 126 now transmits its full spring force F126, amplified twice, to the roller 146, as a result of which a considerable machining force is exerted on the thread 50. The rollers 136, 138 and 146, which, like the rollers 36, 38 and 46 of the first exemplary embodiment, have teeth 47 on their outer circumference, thus roughen the thread 50 for subsequent better sealing (for example by hemp threads) when turning the thread. Roughening device 1 10 around the thread 50 accordingly. The rotation around the thread 50 is - like the entire operation of the thread roughening device 10 or 110 - possible with one hand, since the user does not have to apply any force in the processing position, but this is brought up by the compression springs 26 and 126.

The spring force F126 of the compression spring 126 is increased twice in the processing position. On the one hand in the ratio of the distance from the stops 1301 or 141 1 (as the line of action of the compression spring 126) to the axis 131 to the distance between axis 131 and axis 1441. The ratio of these distances is about 2.5: 1, so that a two and a half times increase in the spring force 1 126 is transferred to the coupling 144 on the axis 1441. The coupling 144, in cooperation with the detent bearing lever 142 in the manner of a toggle lever, once again increases the force approximately twice with which the cutting edge 1433 of the detent lever 143 exerts on the roller bearing lever 145 and thus on the other roller 146. Taken together, both gear ratios thus increase the compressive force F126 of the compression spring 126 up to the further roller 146 by a factor of five.

As a result, with a spring force F126 of, for example, 200 N, a compressive force of about 1000 N can be generated on the roller 146, whereby due to the swivel ratio between the axis 131, the spring 126 and the lower end of the support lever 130 of the main lever 141 compared to the spring force F126, only About half the operating force of about 100 N is required to close the brackets 130 and 141 and, due to the stop of the nose 1474, also to release the locking of the control lever 143 by means of the unlocking lever 147.

As shown in FIGS. 6 to 11, the thread-roughening device 110 according to the invention is suitable for machining threads 50 with different diameters. Five different diameters of 0.5 inch, 0.75 inch, 1 inch, 1.25 inch and 1.5 inch common in the installation trade or in pipeline construction are mentioned here as examples. The distance between the rollers 136, 138 and 146 is correspondingly dimensioned so that the smallest diameter D is just caught by the rollers 136 and 138 and the largest diameter D is still compensated for by the movement of the roller 146 against the force of the tension spring 1452 can. Likewise, the distances between the notches 1451 on the outside of the roller bearing lever 146 and the notches 1435 on the inside of the locking lever 143 and the position of the cutting edges 1436 and 1453 are designed for these different diameters.

The spring force F1452 of the tension spring 1452 and the spring force F1425 of the tension spring 1425 can be far less than the compressive force F126 of the compression spring 126, there they only have to resiliently bias the roller bearing lever 145 or the locking lever 143 into their operative position. Spring forces F1452 and F1425 of 10 N or less are completely sufficient for this.

List of reference symbols

10 thread roughening device 20 handle

22 housing

23 lid

24 recording

25 threads

26 compression spring

27 bullet

28 slot

29 interior (of 22)

30 carriers

32 support ring

34 holders

35 rivet

36 (first) roll

37 axis (of 36)

38 (first) roll

39 axis (of 38)

40 pressure device

41 thrust piece

42 shaft

43 carriers

44 cheek

45 axis

46 (further) role

47 tooth

48 slider

50 threads (e.g. on one pipe end)

D diameter (from 50)

110 thread roughening device 126 compression spring 130 carrier (carrier lever)

1301 attack

1302 spring bearing (for 1452 to 130

131 axis (connection of 130 and 141)

132 axis (connection of 130 and 142)

136 (first) roll

137 axis (from 137 to 130)

138 (first) roll

139 axis (from 138 to 130)

140 pressure device

141 main lever

1411 attack

142 Detent Lever

1421 spring bearing (from 1425 to 142)

1425 mainspring

143 locking lever

1431 axis (connection of 143 and 142)

1432 (front) lever arm (of 143)

1433 (rear) lever arm (of 143)

1434 spring bearing (for 1425 to 143)

1435 notches (on 143)

1436 cutting edge

144 paddock

1441 axis (connection of 141 and 144)

1442 axis (connection of 142 and 144)

145 Roller bearing levers

1451 spring bearing (for 1452 to 145)

1452 mainspring

1453 cutting edge

1455 notch (s) (an 145)

146 (further) role

1461 axis (connection of 145 and 146)

147 Release Lever 1471 axis (from 147 to 141)

1472 (front) lever arm (of 147)

1473 (rear) lever arm (of 147)

1474 nose

F 126 spring force (of the compression spring 126) F 1425 spring force (of the tension spring 1425) F 1452 spring force (of the tension spring 1452)

Claims

1. Thread-roughening device (10; 110) with at least two first rollers (36, 37; 136, 137) mounted on a carrier (30; 130) and at least one further roller mounted on a movable component (40; 140)

(46; 146), the first rollers (36, 37; 136, 137) and the further roller (46; 146) closely surrounding a thread (50) and roughening by a rotational movement around the thread (50) of the thread (50), characterized in that the further roller (46; 146) by means of a movably mounted pressing device (40; 140) loaded by a compression spring (26; 126) in the direction of the first rollers (36,

37; 136, 137) is movable.

2. Thread roughening device (10) according to claim 1, characterized in that the pressing device (40) and the spring (26) in one

Housing (22) of a handle (20) are mounted.

3. thread roughening device (10) according to claim 1 or 2, characterized in that the pressing device (40) is movable by means of a slide (48).

4. thread roughening device (10) according to claim 3, characterized in that the slide (48) is guided in a slot (28) of the housing (22).

5. thread roughening device (10) according to claim 4, characterized in that the slot (28) allows a movement of the slide (48) to position the further roller (46) on differently large diameters (D) of the thread (50) .

6. thread-roughening device (10) according to one of the preceding Ansprü surface, characterized in that the pressing device (40) a comprises a ball (27) arranged between the spring (26) and a pressure piece (41).

7. thread roughening device (10) according to one of claims 2 to 6,

characterized in that the housing (22) is firmly connected to the carrier (30).

8. thread roughening device (10) according to one of claims 2 to 7,

characterized in that the housing (22) can be closed on its side facing away from the carrier (30) by means of a cover (23).

9. The thread-roughening device according to claim 8, that the cover (23) is provided with a receptacle (24) for the engagement of a tool.

10. thread roughening device (10) according to one of the preceding Ansprü surface, characterized in that the carrier (30) has a support ring (32) on which the first rollers (36, 37) are gela by means of a holder (34) .

11. thread-roughening device (110) according to claim 1, characterized in that the pressing device (140) of a with a support lever (130) serving as a carrier (130) pivotally connected main lever (141) and a via a translation Gear (142; 144) swivel bar with this connected locking lever (143) is formed, which depends on the diameter (D) of the thread (50) in the position of several notches

(1435; 1455) can be brought into engagement with a further roller (146) carrying roller bearing lever (145).

12. Thread roughening device (110) according to claim 11, characterized in that the roller bearing lever (145) is resiliently preloaded by means of a tension spring (1452) in the direction of the first rollers (136, 138).

13. Thread roughening device (110) according to claim 11 or 12, characterized in that the locking lever (143) is resiliently preloaded by means of a tension spring (1425) in the direction of the roller bearing lever (145).

14. Thread roughening device (110) according to at least one of claims 11 to 13, characterized in that the latching lever (143) is in operative connection with an unlocking lever (147) which in turn is pivotably mounted on the main lever (141).

15. Thread roughening device (110) according to claim 14, characterized in that the unlocking lever (147) on a rear lever arm (1473) has a nose (1474) projecting towards the support lever (130), by means of which the unlocking lever (147) can be brought into a position with the roller bearing lever (145) which disengages the latching lever (143) when the main lever (141) and the support lever (130) are pressed together.