DE6606708U - ONE-PIECE TORQUE LOCKING SCREW - Google Patents

Description

■ PATfNTA fl WALTE ^-

DR. E. WIEGAND DIPL-ING. W. NIEAAANN DR. M. KÖHLER DIPL-ING. C. GERNHARDT

MÖNCHEN HAMBURG

TELEPHONE: 395314 2000 HAMB URG 50, ^β 2 6.

TELEGRAMS: KARPATENT KDN I GSTRASSE 28

V. 25 168/68 4 / I ¹ IR 37 308 / 47a & bns

Hussein Burdsall & Ward Bolt and Hut Company Port Chester, Ή. Y. (V.St.A.)

/ One-piece torque locking screw y

The invention relates generally to thread fasteners Made of metal and in particular on locking screws, which are predominantly with torque work.

Locking screws are of two general types, namely those that work predominantly with torque and those that are freely rotatable. Locking screws, which mainly work with torque, can be turned freely over a few turns and then have to be tightened into their final position using a tool. The pre-locking force is achieved when the part or parts of the screw thread which create the locking feature and the thread of the bore of the mounting part of the assembly that mates with it are in engagement with one another. The ^v erriegelungswirkung or the locking effect is aufrecbterhalten has been rotated sufficiently long in Löuerichtung to the screw or -Aufnahmeteil, locking to the

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Part of the thread shaft of the thread of the threaded hole of the receiving part to be released. There are different types of predominantly torque locking screws are known, and everyone Type has a feature in its thread, e.g. deformation, interlocking fit or the addition of a resilient material which requires that the screw is rotated during assembly with the receiving part duroh a Y / tool. the Locking is done by pressure. Friction or elastic Deformation that develops between the thread of the screw and the corresponding thread of the Aufnahraeteils has been.

There are different designs of screws known in which different means for the purpose used to prevent loosening of a screw due to vibration or other reasons. In one embodiment, a plastic plug or a plastic band inserted into the thread path of the shaft. This version has the disadvantage that the plastic insert or plastic insert is affected by heat or cold and accordingly cannot be used for many purposes. Furthermore, the plastic inserts are often lost, before the screw is used for the first time. Another type of locking screw is an all metal construction to which the invention relates. Here screws are known, their execution is made so that the screw can be easily tightened but that it resists loosening (U.S. Patent 3,124,188). When executing other known screws, the underlying idea is in certain turns of the thread near the foot have rigid ridges without removing the crest of the thread at any point along the thread shaft.

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to bend. This type of screw does not bend the rigid bumps or bumps of the screw, when the screw is tightened, but the thread of the mounting hole is bent at those points where the rigid stool engages with it (US Pat. No. 2,177,004). With one more Another known locking screw, the thread in the area of the comb is slotted to be arranged at an angle Create lips, or create a V-shaped staggered segment with a radially arranged one Rib as disclosed in U.S. Patent 2,177. - ^ s is also a fastening device known, however, which does not have a one-piece thread fastening device is, but needs two parts to obtain any security effect, namely a commonly threaded screw and one helically wound insert from a long Wire diamond-like cross-section that has staggered segments and by twisting the wire around one Angle of about 45 ° is formed around its longitudinal axis. The insert is fitted with a special thread The mounting hole is screwed, after which the usual screw is screwed into the insert, (German Patent specification 1,186,278). This version is not a security screw, as the screw itself is a common one Screw is.

In all known locking screws, the staggered segments, if any, are used., to produce a locking effect when the screw is screwed into a receiving bore, such that the so-called security elements with the flanks of the container come into contact with the receiving bore along only a single line. This means, they do not come into engagement with the planks of the receiving thread with a spring action that extends over the entire Length and width of the staggered segments are the same

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förialg is distributed. With those known Locking screws, in which the offset locking segments with the planks of the receptacle come into engagement, is in some designs a single building line with the flank of the receiving thread at right angles to the longitudinal center line of the screw shank, while in other designs contact with the plank of the receiving thread along a single arcuate one Line takes place. In each of these cases, there is rapid wear, scarring or seizure of the offset segments when screwed into or unscrewed from the mounting hole. If the screw is to be reused, the loosening torque drops after a few reuses the screw off * This means that the screw loses the expected and desired locking effect.

Locking screws made according to the invention are those made entirely of metal exist and which deformed threads and in particular groups of deformed segments of the threads with the deformed segments having a considerable arc length, and these segments become deformed in the axial direction in a V / s to a number of deformations aligned in the vertical direction of considerable arc length so that the deformed segments beyond their arcuate Lengths are offset from the rest of the thread, but the same screwdriver angle over their arc lengths or the same pitch angle as the helix angle of the remaining or undeformed parts of the thread of the threaded shaft. That is, the deformed or misaligned ones lying vertically in alignment Segments or deformations create a group

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of locking segments of considerable arc length, each of which is at the same angle of inclination as the usual screw angle of the undeformed or usual part of the thread, so that the slope of the entire surface of the lower plank of the offset segments is the same as is the slope of the surface of the lower plank of the undeflected portion of the thread; and the inclination of the entire surface of the upper plank of the offset segments is the same as the inclination of the surface of the upper flank of the undeflected portion of the thread.

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mainly consists in that the staggered lock segments of the exercise on the planks of the thread to him matching ^a ewindebohrung with a spring action, a friction over their entire contacting surfaces, which is distributed over the arc lengths of the locking segments gleichförmig.ef with torque working See approximate screws made of metal, and Disadvantages of the known locking screws are overcome. Furthermore practice when according to the invention manufactured screw in a vessel equipped with Gewindebohruag receiving part in a locking position is tightened, the group of lying in the vertical direction in orientation offset ^v erriegelungssegmenten forces in one direction, whereby the planks of the gvj?, However, the Screw in an arc of 180 ° diametrically opposite the group of offset segments forcibly exert additional friction on the planks of the associated thread in this arc, whereby the overall locking effect is increased in this way. In the following, embodiments of the invention are described, for example, to which the linkage is not limited.

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Pig. 1 shows a side view, partially broken away, of a screw according to the invention with a hexagonal head. "

Pig. Figure 2 is a view looking towards the forward end of the Figure in Pig. 1 shown screw.

Pig. Fig. 3 is a sectional side view of that in Pig. 1 shown screw on a reduced scale, which in a locking position in a matching threaded hole in a nut is screwed in, according to line 3-3 of the Pig. 4, the screw shown in view and across from that in Pig. 1 position shown is rotated by 90 °.

Pig. Figure 4 is a sectional view taken along line 4-4 of Pig. 3.

The Pig. 5, 6, 7 and 8 are sectional views along lines 5-5, 6-6, 7-7 and 8-8 of Pig, respectively. 4, wherein the G _e is threaded shank of the screw shown in side view.

Pig. Figure 9 is a sectional view, on an enlarged scale, taken along line 9-9 of Pig. 1.

Pig.10 is an A _as icht after line 10-10 of the Pig. 9 and shows the stepped segment in a single G-thread turn.

Pig. 11 is a view taken on line 11-11 of Pig.

Pig.12 is a view taken on line 12-12 of Pig. 9.

Pig. 13 is a view similar to that of Pig. 12 to the Locking effect of the offset segment when the screw is screwed into a suitable threaded hole.

Pig.14 is a side view of the movable or moving unwinding tool of a pair Unwinding tools for roping in the thread the shaft of the screw, with the special insert for rolling in the staggered segments

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removed from its slot in the thread is.

Pig, 15 is a detailed view on an enlarged scale the front surface of the moving bulwark tool, with the special insert to move the locking segments in its - ^ recess arranged in place is.

Figure 1b is a side view, on a reduced scale, of the front surface of the insert. .16a is a side view of the in Pig. 16 shown Use.

Pig. 17 is a front view of the fixed one Tool of the pair of tools for oiling the thread.

Pig. Fig. 18 is a top plan view, partially in section, of the stationary one in Pig. 17 illustrated tool Pig. Fig. 19 is a perspective, somewhat schematic view showing the oiling of screw shafts between the stationary and the moving "tool.

The threaded fastener as described below is called a screw, however, this term is intended to include the term "bolt" or other product that is externally threaded is provided.

Referring to the drawings, in which like reference numerals designate the same elements bennjenen contains a ° chraube 20 of the invention is prepared in accordance with, a head 21 and a ^u chaft 22 having a thread 23, in which a plurality of aligned of vertically staggered segments 24, 25, 25 is arranged, which form a group 27 of staggered segments or deformations, some of which are hereinafter referred to as indentations

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and these have staggered segments a considerable arc length.

The head 21 is, as shown, a ° een.skantkopf, and the thread 23 on the shaft is except the offset parts have a common V-thread, which has a common helix angle and a pitch / p Has.

Any head or part which can provide a means for turning the screw by means of a wrench or other suitable tool can be used in place of the hex head shown in the drawings. The threaded portion of the shaft can extend the entire length of the shaft or it can end just before the head, as shown. Optionally, an unthreaded portion of smaller diameter can be located at the front of the shaft.

Hex threaded part may be considered to have a forward end portion 28, a ^v erriegelungsteil 29, which contains the group of offset segment, and a hir, terc-n end part 30, - ^ he erthält locking member sine plurality offset segments 24, 25 , 26, which are axially deformed indentations of considerable arc length in successive turns 23d, 23e, 23f of the thread 23, and these offset segments lie between the front end thread part 28 and the rear end thread part 30. "

In the preferred embodiment as described in Pig. is shown, there are three indented or offset segments 24, 25, 26 provided in aufeinar-Gerfolgenden root of the thread, but may have a different number of gears of ^a ewindes be deformed out to share a group of lying in the vertical direction in alignment offset segments; however it is

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desires that the lowermost offset segment be a sufficient distance from the front end of the thread to provide at least two or three threads 201 which are not deformed and therefore freely rotatable to commence screwing into a suitable thread. to facilitate ewindeaufnahmebohrung in the part that is to Werdan introduced in which the screw. I _n some cases it may be desirable to arrange the group offset locking segments closer to the rear end portion of the threaded shank.

The arc length f of each of the offset locking segments is about 25 ° / ° of the arc length or a circumference of a duct of the wind measured along its crest. Each of the oegmente is offset from the remaining part of the passage in which et »is arranged by a depth d, which is preferably 1/3 of the pitch ρ of the wind. However, the length of the offset segments can be larger or smaller than shown and can be within a range of 10 ^ to AOf> the length of a turn of the thread, if it is desired to change the locking action. The depth d of the displacement of the locking segments should be less than half the pitch of the wind and can be within the range of 1/8 to 1/3 of the pitch.

In this regard it should be noted that the staggered segments in group 27 of the interlocking segments have the same ^ screw angle along their entire length Length as the usual helix angle of the remaining not have deformed part of the "ewindes 23. The consequence of this training is that when the screw into a locking position in a suitable winch When the hole is tightened firmly, the offset segments exert a spring force downward on those in contact with them standing upper bare of the ^ ufnahinegewindas

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exerting the threaded hole into which it is screwed, and this resilient effect is over
erriegelungssegmente the lengths of the offset ^v
equally distributed. Because the arc length
the staggered segments is made larger, can
a greater frictional and resilient locking effect can be obtained, and by reducing the
Length can be obtained a reduced ^v erriegelungswirkung. Furthermore, by increasing or decreasing the depth of the offset part, a greater one can be obtained

or get smaller locking effect respectively

will.

s The resilient effect of the offset segments lengthways

their lengths are shown in FIGS. It '

it can be seen that the drawings to representational: are kept exaggeratedly large for purposes of In Pig. 3 is

the screw is shown so that its threaded shaft ■

into a matching threaded hole 31 of a nut 32,

screwed in, and this view runs along \

the section line 3-3 of FIG. 4. This shows |

(see also Fig. 7) that the middle part of the lower \

Flanks 35, 36, 37 of the offset segments 24, 25, 26 *

in gears 23d, 23e, 23f of the wind with friction *

on the upper flanks 38, 39, 40 of the courses 41b, 41c, |

41d of the receiving part 41 of the threaded hole engages f

and a downward resilient effect on them ί

exercises. From Fig. 7, which is a sectional view along line 7-7 of Fig. 4 and Fig. 8, which is a sectional \

illustration along line 8-8 of Fig. 4, is recognizable \

bar that the lower flanks 35, 36, 37 of the offset j

Segments 24, 25, 26 with the upper flanks 38, 19, 40 ]

the threads 41b, 41c, 41d of the thread 41 of the bore 31 j come into frictional engagement and a spring force
exercise down on them. The spring action is over
the lengths of the staggered segments uniformly

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divides because the helix angle of the staggered segments is the same over its lengths as the usual screw angle of the remaining part of the thread 23, which of course has the same screw angle as the receiving thread 41 that fits it.

The spring action of the offset segments is still shown in an exaggerated manner in FIGS. 9 to 13 represents which, in enlarged views, depicts a single turn of the thread with an offset locking segment 25 in the "ewindegang 23e" Ea it can be seen that when the ° screw is screwed into the locking position (see FIG. 13), the lower one Flank 36 of the offset locking segment with the upper flank 39 of the receiving thread matching the date the nut 32 is engaged. -Uas offset locking segment exerts a resilient force against the upper flank 39 of the associated Aufnähmegewindää the end. The dashed line 33 indicates the lower flank of the remaining part of the corridor 23e of the Thread, which is of the usual training. Figure 12 is a view taken along line 12-12 of Figure 9 and shows in dashed lines 34a the upper flank of the undeformed part of the passage 23e of the wind, and the line 34 indicates the upper flank of the offset segment 25.

From Fig. 5, which is an illustration along line 5-5 of FIG. 4 and FIG. 6, which is an illustration along line 6-6 of FIG. 4, it can be seen that the lower flanks 42a, 42b, 42c, 42d , 42e of the thread 23 in the arcs of the thread, which are diametrically opposite the offset segments 24, 25 _t 26, exert a downward force on the upper flanks of the threads 41a, 41b, 41c, 41d, 41e of the receiving thread 41. That is, the lower flanks of the screw thread in the arc angle cL of 180 diametrically opposite the offset locking segments (Fig. 4)

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practice on the upper flanks of the mounting thread in this arch creates an additional friction force. this is generated by the forces resulting from the peder action of the offset segments that result in the upper planks of the receiving thread in the arch exert a downward force on your them with them in Standing touch. That is, the offset lower bare of the offset segments exert downward forces the upper planks of the receiving thread from there, where the offset segments engage with them, and the result is that thereby the shaft of the thread is slightly tilted from its vertical axis is so that those parts of the ^ ewindes of the shaft in the arc of 180 ° diametrically opposite the offset segments exert forces in such a way that that the lower planks of the screw thread in this arch on the upper-blank of their matching Take-up thread in the bow exert downward forces. Therefore, when the screw is in the appropriate threaded hole is screwed in, not only the locking effect of the pedestrian influence offset segments over their entire lengths, but also because of an increased locking effect the added friction where the lower planks of the screw thread of the usual part of the screw thread with the * 'lanks of the receiving thread in the arch diametrically opposite the locking segments of the thread of the screw are in engagement. The Pig. 14 through 19 give thread rolling tools and the manner in which the locking segments are offset in certain turns of the thread. In Fig. 19 is a fixed bulging tool 50 and a moving hammer tool 51 shown, thread rolling machines are well known in the art. The screw blank 20a is between these

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Tools rolled in the usual way, but the working surfaces of the rolling tool are appropriate modified to make the puncture of the staggered ° segments to be carried out in certain turns of the rolled thread. During the rolling process, the Holl tool 51 'as indicated by the arrow? 2 is moved to the left and causes the screw 20a to also rotate in the direction of the Arrow 52 between the stationary and moving Tool rolls off. The surfaces of the tools have milled-in thread grooves of known cross-sectional shape provided, the bevel and the pitch being the helix angle and the pitch of the thread to be produced on the shaft of the screw.

It can be seen in FIG. 1 that the moving rolling tool 51 is provided with a cutout or slot 55 at its rear end to receive an insert which is fitted into the slot 55. The front surface 57 of the rolling tool 51 is provided with milled grooves 54 which have the pitch and the helix angle of the rolled thread. The insert 56 has a length corresponding to the length of the slot 55 and a width Wa so that it fits snugly into the slot 55. The front end of the insert is provided with grooves 54a of the same inclination and pitch as the grooves 54. The length Lg of the grooves 54a corresponds to the length -2 of the offset segments desired in the threads of the screw, and the number of thread-forming grooves in the segment is equal to the number of offset segments desired in the finished screw. The rear of the front surface of the insert 56 is cut away so that no part of the tool will interfere with the offset segments of the thread after they have been rolled onto the shank of the screw.

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- 14 - 1

The milled '- ^T utes 54a, if the use of 56 g

is in place, opposite the ge |

mill grooves 54 in a vertical view around a |

Staggered size, which the desired |

Offset of the locking segments generated. Pre |

An offset of 1/3 the pitch i is preferably provided, although a different amount of offset may be desired and the grooves can
up to about 3/8 of the pitch.

The face 60 of the stationary rolling tool has
appropriately milled grooves 61 of the same
Bevel and pitch like the surface 57 of the

moving bulwark tool. The area of this |

Tool has I at its rear end or return end

a cut-out part 62 corresponding to the length |

of the insert slot 55 of the movable picking tool, |

so that after once the usual thread through f

the surfaces 57 and 60 have been created and the \

locking offset segments by the tool- j

use of the moving honing tool it rolled §

the staggered segments formed are not |

disturbed or in a line or alignment with the |

remaining part of the thread is rolled back, Z

which of usual pitch and usual screw [.

angle is. I.

In the aforementioned preferred embodiment |

of the invention are the offset locking segments |

shown as indentations in downward direction, each- %

but it is evident that the invention also includes the] =

placing the locking segments in the upward direction [includes in which pail the in the moving
Thread rolling tool used insert in such a way
is arranged so that the grooves 54a are opposite to the grooves 54
are offset upwards by the required size. In
in such a case, the staggered locking

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aegmente on the lower flanks of the matching Take-up thread exert a spring action.

The expressions chosen for this are for purposes only The explanation has been used and do not represent a limitation. They therefore also include changes within the scope of the invention.

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Claims (5)

SchutBansρrüche f 1. One-piece torque locking screw, whose Shank has external threads in which the thread crests lie on an imaginary straight cylinder, the cylindrical surface of which passes through the crests, with an offset segment of considerable arc length in
at least two courses of the wind are present, the are arranged so that a plurality of vertically aligned offset segments are formed, the crests of which lie in the imaginary cylinder surface, characterized in that the offset segments lie at a helix angle which is the same as that
Helix angle of the remaining part of the thread, / and that the inclination of the surface over the entire area of the upper and lower flanks of each offset segment is the same as the inclination of the surface of the upper and lower flanks of the not
bent remaining part of the thread is. 2. Securing screw according to claim 1, characterized
characterized that the offset segments between the first two turns of the thread lie at its front end UE ^ the rear end of the thread. 3. Safety screw according to claim 1 or 2, characterized in that the segments by less than the Half of the pitch of the thread are offset. 4. Locking screw according to one of claims 1 to 3, characterized in that all offset segments have an arc length in the range of 10 to 40 7 ° of the arc length of a full turn or a full length of the thread of the shaft. 5. Safety screw according to one of claims 1
to 4, characterized in that all offset
Thread segments are offset in the same axial direction. NOTE "" * ^ < »_ - H> l * rlflrtAn nnilllUDII * iw · ■ - ^: Request will: 660670819.11.70