DE202021105344U1 - Safety screw connection to secure a screw connection against unauthorized loosening - Google Patents

Abstract

Safety screw connection (1) for securing a screw connection against unauthorized loosening, with a screw connection body (2), a screw connection body (2) which at least partially receives the screw connection body (2) and as such is not connected to the screw connection body (2) in a torsion-proof manner, and a removable safety pot (3) Key (4) for actuating the screw connection body (2) by turning it, characterized in that between the safety plug (3) and the screw connection body (2) by local radial projections (5) on the screw connection body (2) and local recesses (6) on the safety cup (3) an annular gap (7) forming a coding is formed into which only the appropriately coded key (4) can be inserted so that the screw connection body (2) can be tightened or loosened by turning the key (4).

Description

The invention relates to a safety screw connection for securing a screw connection against unauthorized loosening according to the preamble of the main claim. The invention also relates to a safety screw connection unit and a safety screw connection system.

TECHNICAL BACKGROUND

In practice, in many very different cases, the problem arises that a screw connection has to be secured against unauthorized loosening.

In the case of wall-mounted or stand-mounted cigarette or vending machines, this problem is solved by standard screws that are installed in a concealed manner. They are installed in such a way that they can only be released by those who, as the key holder, have access to the normally locked interior of the machine.

Problems are caused by objects that cannot be screwed securely into place. The spectrum begins with high-quality designer park benches, which are set up in the unmonitored outdoor area and therefore cannot easily be unscrewed from their steel feet that are embedded in the ground for the purpose of theft protection. And it ranges from expensive and therefore theft-prone car aluminum rims to the wheels of bicycles, which are a coveted object of theft because of their highly efficient and correspondingly expensive hub motors or 14-speed, also very expensive hub gears.

It is already known to use wheel bolts to prevent theft of aluminum rims which do not have a hexagonal head, but a groove pattern individually milled into the end face of their cylindrical bolt head. The wheel bolt in question can then only be tightened and loosened using the special nut supplied, while conventional screwing tools do not find a sufficient point of application.

Such wheel bolts only offer adequate protection in the case of aluminum rims in which the bolt head, when tightened, is arranged completely sunk in the hole receiving the wheel bolt, because only then is it impossible to loosen the wheel bolt by simply inserting its bolt head into the " Stranglehold "takes a suitably large, self-tightening pipe wrench.

To solve this problem, which occurs when the bolt heads are not completely sunk in the tightened state, the utility model, for example, recommends DE 20 2005 017 380 a wheel bolt with a hemispherical rounded bolt head, on which even a brutal pincer attack will fail because the pincer jaws only find a hold on a very small area. The corresponding figure of this prior art is in 1 shown.

An attempt is now being made, not least because of its friction cone lock 105 Naturally, to loosen very tight wheel bolts, then the small area of the bolt head on which the pliers jaw is initially able to grip is deformed plastically. The pliers then lose their local hold and slip on the surrounding spherical surface of the bolt head.

The anti-theft effect of this known solution is questionable wherever screw connections are to be secured that are much less tightly tightened than the wheel bolts of a car, which are usually tightened with a torque between 120 Nm and 180 Nm, which are also secured by their friction cone and are therefore difficult to solve.

THE UNDERLYING TASK

In view of this, the object of the invention is to provide a means with which an increased security of an exposed screw connection against unauthorized loosening can be guaranteed.

THE SOLUTION ACCORDING TO THE INVENTION

According to the invention, this problem is solved with the features of the main claim.

For this purpose, a safety screw connection is used to secure a screw connection against unauthorized loosening, with a screw connection body, a safety pot that at least partially or at least essentially receives the screw connection body in the screwed state, as such is not connected to the screw connection body in a non-rotatable manner, and a removable key for operating the screw connection body suggested by twisting the same.

This safety screw connection is characterized in that an annular gap forming a coding is formed between the safety plug and the screw connection body by means of local radial projections on the screw connection body and local recesses on the safety plug. Only the appropriately coded key can be inserted into this annular gap in such a way that the screw connection body can be tightened or loosened by turning the key.

The safety screw connection according to the invention thus comprises a screw connection body. This screw connection body can be designed either as a locking nut or as a locking screw. In the case of the design as a locking nut, the screw connection body is screwed onto a threaded bolt that receives it, the locking nut itself having a central thread, preferably a through thread. In the case of an embodiment as a locking screw, the screw connection body is screwed into a threaded hole, the locking screw itself providing the threaded bolt.

The fact that is decisive for the increased security against theft, however, is the outer contour of the screw connection body, in the case of the locking nut the entire outer contour and in the case of the locking screw the outer contour of the head. In the screwed state, the locking nut is thus preferably completely received by the locking pot and thus completely enclosed. In the case of the securing screw, only the head of the securing pot is accordingly preferably taken up and thus completely enclosed.

The securing pot has local recesses and the screw connection body has local radial projections which interact in such a way that, at least in sections, there is a coding annular gap between the securing pot and the screw connection body, into which only a specific, appropriately coded, removable key can be inserted , with which the screw connection body can then be rotated and thus tightened or loosened.

The locking pot, which at least partially surrounds the screw connection body, is not connected to the screw connection body in a torsion-proof manner even in the screwed state and can only be rotated together with the screw connection body by inserting the key into the annular gap. Without an inserted key, the locking pot can correspondingly loosely be rotated around the screw connection body located at least partially in it, without the screwed connection body moving with it.

Due to the fact that the safety plug is not connected to the screwing body in a rotationally fixed manner and that the safety plug has local recesses as mentioned, the position of these local recesses of the safety plug can be changed continuously to the position of the local radial projections of the screwing body. For this purpose, the rotatable safety pot - even without an inserted key - only needs to be turned around the screwed and thus fixed screw connection body. This can preferably be done without a great deal of force, preferably even just by tapping with a finger.

The great advantage of the safety screw connection according to the invention is that the intended loosening and closing of the screw connection can only be carried out with a specially coded key and also only in a special twisted position of the safety pot.
As mentioned, the key can only be inserted into the annular gap if the projections of the screw connection body and the recesses of the safety plug are specially positioned with respect to one another. Due to the infinitely variable rotation of the safety plug around the screw connection body, there are virtually unlimited possibilities for positioning. A potential thief cannot know which position of the two parts to one another is the "correct" position for loosening the screw connection.
In addition, the screw connection body cannot be gripped from the outside on its circumferential surface, since the locking pot rotating loosely around it protects against it.

These advantages taken together make the invention and increase the theft security enormously.

The safety screw connection according to the invention is completed by its individual applicability. Because a locking screw or a locking nut can be used as the screw connection body, as mentioned above, a wide variety of parts can be equipped with the safety screw connection.

In the context of the invention, “picking up” means, with reference to the safety plug and the screw connection body, that the screw connection body is enclosed by the safety plug.
“Enclosing” here only means that at least the circumferential surface of the safety plug preferably completely covers the circumferential surface of the screw connection body. The end faces of the two parts are not affected. It should be emphasized again that when using a securing screw, only the head of this securing screw is preferably received or enclosed by the securing pot.

Regardless, the problem is also solved as follows.

A safety screw connection is used to secure a screw connection against unauthorized loosening, with a screw connection body, a screw connection in the screw connection body State at least partially receiving, as such, not connected to the screw connection body in a non-rotatable manner, and a removable key for actuating the screw connection body by rotating the same is proposed. This safety screw connection is characterized in that the safety plug at least partially accommodates the screw connection body in such a way that at least in sections an annular gap remains between the inner circumferential surface of the safety plug and the outer circumferential surface of the screw connection body, with several radial projections defined on the screw connection body defining a key coding due to their positioning on the screw connection body which protrude into said annular gap, and the locking pot has local recesses, preferably in the form of grooves, which locally enlarge the annular gap in the area of said radial projections radially outwards in such a way, and that the key has form-locking elements that are designed so that they can in any case be inserted into the annular gap in the area of the recesses in such a way that they couple positively to the radial projections of the screw connection body, so that the screw connection body rotates, so it can be tightened or loosened.

For this, protection is claimed regardless of other claims.

The above definition of terms, descriptions and advantages apply here accordingly.

PREFERRED TRAINING OPPORTUNITIES

There are a number of possibilities for designing the invention in such a way that its effectiveness or usefulness is even further improved.

It is particularly preferred that the said local recesses are preferably only formed on an inner collar of the securing pot, which the latter carries on its end face facing the respective key.

This results in an additional safety function, since the end face of the safety pot is also partially covered and thus makes access to and the view of the screw connection body more difficult. In addition, the inner collar offers other options and advantages, which will be explained in more detail below.

In addition, it is preferred that the form-fit elements of the key are part of a preferably predominantly round pipe section, generally closed in the circumferential direction, on which each form-fit element represents a radially outwardly extending bulge in the wall of the pipe section.

In addition, it is preferred that the wall thickness of the wall of the pipe section is 2 mm, preferably 1.3 mm and ideally 0.9 mm and the annular gap is only insignificantly wider in the radial direction, at least in the area of its outward opening.

This represents a good compromise between theft security, manufacturing effort, stability and robustness, whereby the function of the form fit and thus the loosening or tightening of the screw connection can be carried out simply and safely. For theft protection, it is essential that the annular gap is only narrow throughout. This thwarted the idea of creating a key for unauthorized loosening by providing a nut which, for example, has a number of solitary pins protruding parallel from it and positioned along a circular line - solitary pins that can be inserted into the gap, then located there "Somehow" hook onto the radial projections and still allow the screw connection to loosen. Because the narrower the annular gap, the more likely it is that the solitaire pins are too weak. Then the necessary forces can only be applied by means of a precisely fitting pipe section, as it is carried by the key in the hand of the authorized person.

Another preferred embodiment consists in that the safety pot has an inner collar on the side facing away from the respective key, on which the screw connection body rotatably holds the safety pot. In this way it can be ensured in a simple manner that the already mentioned, necessary, smooth turning of the safety plug around the screw connection body is guaranteed.

In addition, it is preferred that the screw connection body has a cylinder extension on its side facing away from the key, with which it axially penetrates the inner collar of the safety plug in order to be able to apply direct pressure to a component to be screwed. This cylinder extension can be seen as a counter-element to the mentioned inner collar of the safety plug on the side facing away from the respective key, which together ensure that the safety plug can be rotated smoothly around the screw connection body. It should be emphasized at this point that when the locking screw is used as a screw connection, the “side facing away from the key” means the side of the head of the locking screw facing away from the key.

Furthermore, it is particularly preferred that the screw connection body has a plurality of further radial projections which together form a hold-down device for the inner collar of the securing pot. The additional radial projections attached to the screw connection body in addition to the coding radial projections ensure, on the one hand, that the aforementioned cylinder extension exists and, on the other hand, this at least largely prevents the screw connection body from falling out of the safety plug when it is not installed. An essential point in this context is that the individual, spaced apart radial projections - unlike the continuous collar that they functionally replace - can be positioned so that they do not get in the way during the production of the radial projections involved in the coding.

In addition, a preferred embodiment consists in the fact that the several further radial projections are arranged relative to one another at least essentially in the same way as the coding radial projections, so that the further radial projections can also pass through its local recesses in the course of the installation and removal of the screw connection body in or from the safety pot . This ensures that further radial projections fit through the recesses of the safety plug at least in a certain position and that simple assembly can be ensured.

Another preferred embodiment is that the safety pot carries a first mark, the screw connection body carries a second and a different third brand and the key carries a fourth mark and the safety cup, the screw connection body and the key are designed so that the Key-matching coding provided - can only be inserted into the annular gap between the screw connection body and the safety plug if the first mark and a mark of the screw connection body, preferably the second mark, are aligned with one another as intended, preferably radially aligned, and the same condition for the other Brand, preferably the third brand, of the screw connection body and the fourth brand of the key apply.
In order to facilitate the loosening of the screw connection, it can be shown with simple means in which position the safety pot and the screw connection body must be rotated with respect to one another so that the coded key fits into the annular gap between the two parts. The correct insertion position of the key is also displayed.

Figure list

• the 1 shows the state of the art.
• the 2 shows an exploded view of an exemplary first embodiment of the safety screw connection (screw connection body = locking nut).
• the 3 shows the exploded view 2 from the opposite view.
• the 4th shows the first embodiment of the safety screw connection in the installed state without the key in a three-dimensional view.
• the 5 shows the first embodiment of the safety screw connection in the installed state with the key inserted in a three-dimensional view.
• the 6th shows the first embodiment of the safety screw connection in the installed state with the key inserted in a sectional side view.
• the 7th shows an exploded view of an exemplary second embodiment of the safety screw connection (screw connection body = safety screw).
• the 8th shows the second embodiment of the safety screw connection in the installed state with the key inserted in a sectional side view.
• the 9 shows an exploded view of an exemplary embodiment of the safety screw connection unit with the simultaneous use of two different screw connection bodies (locking nut and locking screw).

PREFERRED EMBODIMENTS

First of all, they show 2 until 6th a first preferred embodiment of the safety screw connection 1 , for example when securing a trailer coupling 18th , which can be attached to a hub of the rear wheel of a bicycle to accommodate a bicycle trailer. This only serves as an example for the wide range of applications of the safety screw connection 1 . In order to show the actual application, a spacer is used in this embodiment 19th used, which ensures a corresponding distance from the rear wheel of the bike and offers a threaded rod as a connection. Any other component with a corresponding threaded rod could also function as a connection option here.

2 and 3 initially show the individual parts of the safety screw connection well 1 and the entire first embodiment - on the preferred but not absolutely necessary example of the axle screw connection of a rear wheel hub of a bicycle, which optionally also secures a trailer coupling.

The fitting body 2 , in this case a lock nut 2a (in the following only referred to as “screw connection body”), has an internal thread and a special external contour. On the outer contour of the fitting body 2 are namely several coding, local radial projections 5 provided, which are each spaced from one another in the circumferential direction. In the example shown, these are preferably at least three and ideally only three of these radial projections 5 , even if only two radial projections due to the view 5 are visible at the same time.

In addition, the screw connection body 2 also further radial projections 13th on its outer contour. In the example shown, these are again preferably three different radial projections 13th . Below these radial projections 13th forms the fitting body 2 a cylindrical extension 12th the end.

To implement the screw connection, the screw connection body mentioned must 2 in the safety jar 3 to be built in. To do this, the radial projections 13th only the local setbacks 6th of the safety plug pass axially. These setbacks 6th are preferred in this embodiment in the inner collar 8th designed as grooves. After passing the local setbacks 6th can the fitting body 2 all the way down, on the inner collar 11th be pushed and is now from the safety pot 3 completely enclosed. The mentioned cylinder extension 12th of the fitting body 2 passes axially through the inner collar 11th and the other local radial projections 13th preferably lie on the inner collar 11th on that the fuse pot 3 smoothly around the fitting body 2 can be rotated. It is noteworthy that the wall thickness of the safety plug is usually chosen so large and adapted to the remaining, ideally inwardly increasing gap width between the safety plug and the screw connection body that it is impossible to close the safety plug with such massive plasticity using hand-operated pliers deform so that the screw connection body can be operated by unauthorized persons. The only local radial projections contribute to this 5 that are designed or rounded in such a way that they cannot be adequately grasped with pliers even through the forcefully plastically deformed safety pot (as it were through its wall).

The screw connection body can then be placed on the threaded rod of the spacer 19th unscrewed, of course the element to be secured, in this example the optional trailer hitch 18th , must be placed in between. In order to obtain additional security against unintentional opening of the screw connection, two wedge lock washers are used in this embodiment 20th on each side of the tow bar 18th used.

The safety screw connection installed or screwed in this way 1 is in 4th clearly visible. The actual, firm tightening of the fitting body 2 Of course, this can only be done with the coded key 4th happen which introduced in 5 can be seen.

The key 4th has a pipe section at one end 9 with various form-fitting elements 10 that make up its coding. These form-fit elements 10 are of course arranged so that the key goes into the annular gap 7th (please refer 4th ) that fits between the fuse holder 3 and the fitting body 2 results. The annular gap 7th results, as already mentioned, by the coding local radial projections 5 of the fitting body 2 , the local setbacks 6th of the safety pot 3 and the further inner contour of the safety pot 3 and the further outer contour of the screw connection body 2 .

Will be the key 4th now inserted, so the pipe section 9 as intended in the annular gap 7th pushed, this forms a form fit, whereby the key 4th together with the fitting body 2 and the safety pot 3 can be rotated and the screw connection can thus be loosened or tightened.

Because the key 4th , as mentioned, only in a certain relative rotational position of the screw connection body 2 to the safety pot 3 to each other in the annular gap 7th fits are on the safety plug 3 and the fitting body 2 also brands 14th , 15th provided to give the user the exact twist position in which the key 4th fits. If these two brands ( 14th , 15th , please refer 4th ) are directly below each other, the relative rotational position of the two parts to each other is reached, so that the coding of the key 4th with the coding of the annular gap 7th matches. Also in which position the key is turned 4th should be introduced, give two brands ( 16 , 17th , please refer 4th and 5 ), one of which is on the fitting body 2 and the other on the bowl 4th is appropriate. Escape both of these brands 16 , 17th with each other, is the correct relative twist position of the key 4th reached and he can in the annular gap 7th to be introduced.

the 7th and 8th also show a second preferred embodiment of the safety screw connection 1 , again by way of example when securing the trailer coupling already shown in the first embodiment 18th .
In order to show the actual application, a spacer is also used in this embodiment 19th used, which ensures a corresponding distance from the rear wheel of the bike and offers an internal thread as a connection.
Here, too, every component with an internal thread would also serve as a connection option.

7th shows the individual parts of the safety screw connection well 1 and the entire second embodiment. The fitting body 2 , in this case a locking screw 2 B , is similar to the first embodiment in the fuse pot 3 introduced. The outer contour of the head of the locking screw 2 B is here identical or at least similar to the outer contour of the locking nut 2a , which is why all the advantages and functions as well as the assembly are identical to the first embodiment. Just the exemplary spacer 19th in this case has an internal thread instead of a threaded rod and the screw connection body 2 is thus in the spacer for assembly 19th screwed. In addition, the safety pot encloses 3 not the entire fitting body 2 but only the head of the locking screw 2 B .

Everything else that has already been mentioned for the first embodiment also applies accordingly to this second embodiment and is carried out identically to it, which is why this is not repeated again at this point.

9 Finally, shows the exemplary design of a safety screw connection unit 21 . Here are two safety screw connections 1 practically screwed together. Of course, this can only work when used as a screw connection body 2 one lock nut each 2a and a locking screw 2 B be used. The locking screw 2 B or its threaded bolt is inserted into the internal thread of the locking nut 2a rotated, with the element to be secured in the middle between the two safety screw connections 1 must be placed. Otherwise, exactly what has already been described in the previous two embodiments also applies here, which is why this is not repeated again at this point.

List of reference symbols

1

Safety screw connection

2

Fitting body

2a

Lock nut

2 B

Locking screw

3

Safety pot

4th

key

5

coding local radial projections on the fitting body

6th

local recesses on the safety plug

7th

Annular gap

8th

Inner collar of the safety plug (on the side facing the key)

9

Pipe section of the key

10

Form-fitting elements of the pipe section

11th

Inner collar of the safety plug (on the side facing away from the key)

12th

Cylinder extension of the screw connection body

13th

further radial projections of the screw connection body

14th

first mark (on the safety plug)

15th

second mark (on the fitting body)

16

third mark (on the fitting body)

17th

fourth token (on the key)

18th

trailer hitch

19th

Spacers

20th

Wedge lock washer

21

Safety screw connection unit

101

anti-theft threaded bolt

104a ''

Deflection curvature

105

Conical centering and friction surface

106

Threaded shaft

107

deepening

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 202005017380 [0007]

Claims (12)

Safety screw connection (1) for securing a screw connection against unauthorized loosening, with a screw connection body (2), a screw connection body (2) which at least partially receives the screw connection body (2) and as such is not connected to the screw connection body (2) in a torsion-proof manner, and a removable safety pot (3) Key (4) for actuating the screw connection body (2) by turning it, characterized in that between the safety plug (3) and the screw connection body (2) by local radial projections (5) on the screw connection body (2) and local recesses (6) on the safety cup (3) an annular gap (7) forming a coding is formed into which only the correspondingly coded key (4) can be inserted so that the screw connection body (2) can be tightened or loosened by turning the key (4). Safety screw connection (1) for securing a screw connection against unauthorized loosening, with a screw connection body (2), a screw connection body (2) which at least partially receives the screw connection body (2) and as such is not connected to the screw connection body (2) in a torsion-proof manner, and a removable safety pot (3) Key (4) for actuating the screw connection body (2) by turning it, characterized in that the locking pot (3) at least partially accommodates the screw connection body (2) in such a way that at least in sections between the inner peripheral surface of the locking device (3) and the outer peripheral surface of the screw connection body (2) an annular gap (7) remains, with a plurality of radial projections (5) which define a key coding due to their positioning on the screw connection body (2), which protrude into said annular gap (7), and the safety pot (3) local setbacks (6) before gt in the form of grooves, which locally enlarge the annular gap (7) in the area of said radial projections (5) radially outward in such a way that the key (4) has form-locking elements (10) which are designed so that they in any case in the area of the recesses (6) can be inserted into the annular gap (7) in such a way that they couple positively with the radial projections (5) of the screw connection body (2) so that the screw connection body (2) can be rotated, i.e. tightened or loosened. Safety screw connection (1) according to one of the preceding claims, characterized in that said local recesses (6) are preferably only formed on an inner collar (8) of the safety plug (3) which the latter carries on its end face facing the respective key (4) . Safety screw connection (1) according to one of the preceding claims, characterized in that the form-fit elements (10) of the key (4) are part of a preferably predominantly round pipe section (9), which is generally closed in the circumferential direction, on which each form-fit element (10) represents a bulge extending radially outward in the wall of the pipe section (9). Safety screw connection (1) according to one of the preceding claims, characterized in that the wall thickness of the wall of the pipe section (9) is ≤ 2 mm, preferably ≤ 1.3 mm and ideally ≤ 0.9 mm and the annular gap (7), at least in Area of its mouth to the outside, is only slightly wider in the radial direction. Safety screw connection (1) according to one of the preceding claims, characterized in that the safety plug (3) has an inner collar (11) on the side facing away from the respective key (4), on which the screw connection body (2) rotatably holds the safety plug (3) . Safety screw connection (1) according to one of the preceding claims, characterized in that the screw connection body (2) has a cylinder extension (12) on its side facing away from the key (4) with which it axially penetrates the inner collar (11) of the safety plug (3) in order to be able to apply direct pressure to a component to be screwed. Safety screw connection (1) according to one of the preceding claims, characterized in that the screw connection body (2) has several further radial projections (13) which together form a hold-down device for the inner collar (8) of the safety pot (3). Safety screw connection (1) according to one of the preceding claims, characterized in that the several further radial projections (13) are arranged relative to one another at least essentially in the same way as the coding radial projections (5), so that the further radial projections (13) are also and removal of the screw connection body (2) in or out of the safety pot (3) whose local recesses (6) can pass. Safety screw connection (1) according to one of the preceding claims, characterized in that the safety pot (3) bears a first mark (14), the screw connection body (2) a second one (15) and a third different therefrom Mark (16) carries and the key (4) carries a fourth mark (17) and the safety pot (3), the screw connection body (2) and the key (4) are designed so that the key (4) - matching Coding provided - can only be used in the annular gap (7) between the screw connection body (2) and the safety plug (3) if the first mark (14) and a mark on the screw connection body (2), preferably the second mark (15), are intended as intended , preferably radially aligned, aligned with one another and the same condition applies to the other mark, preferably the third mark (16) of the screw connection body (2), and the fourth mark (17) of the key (4). Safety screw connection unit (21) according to one of the preceding claims, characterized in that two safety screw connections (1) with different screw connection bodies (2), preferably a locking nut (2a) and a locking screw (2b), are used at the same time, the threaded bolt of the locking screw (2b) ) is screwed into the internal thread of the lock nut (2a). Safety screw system with several safety screw connections (1) according to one of the preceding claims, characterized in that the safety screw connections (1) have different keys (4) generated by appropriate coding by means of different or differently positioned radial projections (5) of the screw connection body (2).

Images