WO2006092445A2

WO2006092445A2 - Component comprising an outer thread for inserting into an inner thread

Info

Publication number: WO2006092445A2
Application number: PCT/EP2006/060461
Authority: WO
Inventors: Arno Giehl
Original assignee: Arno Giehl
Priority date: 2005-03-04
Filing date: 2006-03-03
Publication date: 2006-09-08
Also published as: DE112006000363A5; WO2006092445A3; DE202005003708U1

Abstract

The invention relates to a component comprising an outer thread for inserting into an inner thread (1), a threaded bolt, and a component body (2) which is connected to the threaded bolt, the threaded bolt being formed by two threaded shells (3), a splaying element (4) that can be inserted between two shells, and an elastic counter-pressure element (14) to press the threaded shells (3) onto the splaying element (4). The threaded shells (3) have a friction adhesion region (5') and a tapering splaying/sliding region (5). The course of displacement of the splaying element (4) is limited by a course limiting element comprising a front abutment and a rear abutment (6,7). According to prior art, the components can block during the splaying process and two counter-pressure elements are required. According to the invention, this is avoided by positioning a splaying/sliding region (5) at a distance from the ends of the threaded bolt, and the counter-pressure element (14) is arranged in a peripheral receiving recess (8) in the outer wall of the threaded shells (3), surrounding the same.

Description

description

COMPONENT WITH OUTER THREAD TO INSERT IN

INNER THREAD

Technical environment

The invention relates to a component with external thread for insertion into an internal thread with a threaded bolt, which has an external thread for screwing into the internal thread and an indirectly or directly connected to the threaded bolt component body, wherein the threaded bolt of at least two, relative to each other in the Screwing direction of right-angle direction movable outer threaded shells, a, between the threaded shells insertable pin-shaped expansion element and an elastic counter-pressure element for adjusting the threaded shells is formed on the expansion element, and wherein the curvature of the outer surfaces of the threaded shells corresponds to the radius of the composite threaded bolt, the threaded shells on its inside have at least one parallel to the screwing Reibhaftungsbereich and at least one in the direction of the component body facing away from the end of the threaded shells narrowing spreading / sliding area and the Versch iebeweg the spreader is limited relative to the threaded shells by a Wegbegrenzung with a front stop and a rear stop.

A component with external thread for insertion into an internal thread of this type is as

Screw from DE 100 36 194.3 Al known. The well-known screw has two threaded cups with a Aussengwinde, the outer radius of curvature is less than 180 ° and which can be put together in a threaded blind hole or a nut. About an expanding mandrel, the two threaded shells are then pressed outwards, so that the external thread of the threaded shells comes into positive engagement with the internal thread of the threaded Sacklocks.

To remove the screw this can either be unscrewed from the thread in a conventional manner or it is pulled the expanding mandrel, so that the two threaded cups are again displaced inward and the screw can then be easily pulled out of the threaded hole.

So that the threaded cups and the expanding mandrel do not fall apart in the unassembled state, the known screw on two elastic counter-pressure elements in the form of rubber or spring washers which press against each other in the front and rear of the threaded shells, including the expanding mandrel, wherein the expanding mandrel such is configured such that the displacement of the expanding mandrel relative to the threaded cups on a travel limit with a front and a limited rear stop, wherein the front stop of the front elastic counter-pressure element and the rear stop is formed by the rear elastic counter-pressure element.

Although the principle of a plug-in screw is already feasible with this known screw, this screw has the disadvantage that when inserting the Spreizdoms the two threaded cups are initially employed at an angle to each other and only with progressive insertion, the parallelism of the threaded shells simultaneous engagement of the threaded portions is made each other. This leads to the risk that the threads tilt and damage the thread. Another disadvantage of the known screw is that two elastic counter-pressure elements are necessary to hold the two threaded cups together.

Also US 4478546 A, US 3922946 A and US 3456547 A show a

Screw having threaded shells which are held together by means of counter-pressure elements and can be pressed via an expansion element into an internal thread. Also in these embodiments, the threaded cups are made oblique by pressing the expansion element and there are several counter-pressure elements necessary. Disclosure of the invention

Technical problem

The object of the invention is therefore to provide a component that at low

Costs securely assembled to a screw. Technical solution

[008] According to the invention, this object is achieved in that at least one spreading

/ Sliding portion is arranged at a distance from the ends of the threaded bolt and the elastic counter-pressure element in a circumferential receiving recess in the outer wall of the threaded shells, the threaded shells is arranged encompassing, wherein the receiving recess is arranged such that during the complete displacement in the direction of displacement of the expansion between the front stop and the rear stop is positioned.

The component according to the invention may be a screw, but it is also any other component with an attached thereto, threaded rod-like mounting option conceivable. For more complex components, the mobility of the threaded shells can be achieved, for example, that one of the threaded shells is positively connected to the component, while the other threaded cup or the other threaded shells are connected via the elastic counter-pressure element with this, relative to the component fixed threaded shell. In principle, the invention can be used for all threaded rod-like form-fitting connections with screw effect. However, a preferred application will be the design of a quick release or fixable screw. Another application of the invention may be, for example, in a tap for an internal thread, wherein the threaded shells then have the cutting geometry.

Essential for the invention is the fact that between the spreader and the threaded shells Reibhaftungsbereiche with parallel to the Einschraubrichtung contact surface and spreading / sliding areas are provided with screwing to the direction of contact surface, so that the spreading / sliding areas cause the pressing apart of the threaded cups and prevent the Reibhaftungsbereiche on the static friction that the spreader slips out of the threaded rods again.

New is now the fact that at least one spreading / sliding area is arranged at a distance to both the front and the rear end of the threaded bolt and the elastic counter-pressure element is provided in the region of this spreading / sliding area. So that it does not interfere with the thread functions of the threaded cups, a receiving recess is arranged in the region of the counter-pressure element, in which the elastic counter-pressure element, which may be a spring ring, for example, is used.

Of course, more elaborate embodiments of the invention may also have internally located springs connecting the threaded cups together. In this case, the inclusion can be omitted.

In order to keep the number of necessary elastic counter-pressure elements as low as possible, the elastic counter-pressure element between the front stop and the rear stop of the expansion element is arranged. In this way, no tilting moment is applied to the threaded cups and the impressions of the expansion element between the threaded cups causes a substantial parallel offset of the threaded cups in the direction of the internal thread. Of course, instead of a spreading / sliding area, a plurality of spreading / sliding areas can be provided, in which case either a central, for example, central elastic counter-pressure element or a separate, separate elastic counter-pressure element is provided for each spreading / sliding area.

In order to avoid tilting of the threaded cups relative to each other, however, according to the invention, the spreading / sliding areas must be arranged very close to each other, so that it is preferable to dispense with the provision of several spreading / sliding areas. The preferred embodiment therefore has a spreading / sliding area with a counter-pressure element arranged in a receiving recess. [015] The elastic counter-pressure element should be able to apply an inwardly directed spring force to the threaded cups. At the same time it must allow the mobility of the threaded shells in the radial direction. An advantageous embodiment of the invention therefore has a counter-pressure element in the form of an annular spring, in particular in the form of a metallic spreader ring, which may be formed for example from an angle range of 350 ° covering spring steel ring. Alternatively, rubber rings can be used, wherein it should be noted that a corresponding fatigue resistance is given with repeated use of the screw. If, however, the screw is probably first installed and then, after loosening, not used further, on the other hand, the fatigue strength of the rubber ring is usually of lesser importance.

A practical embodiment of the component is a screw which has two threaded shells, wherein in the range between about one and two thirds of the total thread length a conically tapering, central spreading / sliding region is provided and in each case a Reibhaftungsbereich is arranged in front of and behind this area , Thus, the largest part of the thread length is used, about one third for spreading the threaded cups and with the remaining two thirds for applying a frictional force, which holds the spreader back between the threaded cups. The threaded cups usually have a cross-section which is slightly smaller than a semicircle. In this way remains between the outwardly pressed into the internal thread threaded cups a gap that can be filled by the expansion element.

[017] In addition to the semicircular cross-section, a further recess may be provided in the interior of the threaded cups, so that the expansion element may have rounded outer areas set in sections on the flat area. In this way, on the one hand, the friction surface is increased and, on the other hand, the guidance of the expansion element within the threaded shells is improved. In a preferred embodiment, only the laterally projecting, rounded areas will take over the spreading function, while the remaining area of the expansion element is guided only between the two threaded shells and thus formed as a guide surface.

In such an embodiment, a self-locking of the screw can be easily realized by the guide surface extends in the radial direction into the region of the receiving recess, so that the pushing in of the guide surface during insertion of the expansion element in the receiving recess causes the elastic Counterpressure element is pushed further outward.

[019] If the guide surface now has a corresponding radially outward pointing jumping region, so that the elastic counter-pressure element can be pressed into the internal thread, created by this additional frictional force a positive connection between the threads of the internal thread and the material of the counter-pressure element. In this way, it is easy to simply make a fuse of the screw.

In addition, the guide surfaces can be used to form the front and the rear stop.

For this purpose, too, the guide surface is guided so far radially outward that it extends into the region of the receiving recess. In this area, the guide surface is provided with a recess, so that the elastic counter-pressure element is guided within the recess without radial external pressure to be pressed only in the rear region of the displacement over a then radially outwardly increasing pressure range to form the optional self-locking to the outside. The ends of the recess then form the front and the rear stop, provided that they are designed so that a skipping of the elastic counter-pressure element via this end stop is not possible.

In addition, between the radially outwardly widening area, which presses the elastic counter-pressure element into the internal thread, and the area without radial spreading force, a small elevation may be provided, which acts as a safety catch by the elastic counter-pressure element upon displacement of the expansion element in Direction of the thread inside over this survey must slide. Depending on the shape of the survey on the back so a pure snapping or a solid connection can be made so that a release of the expansion element of the threaded cups is no longer possible without destroying the counter-pressure element or the expansion element.

[023] At least when the component according to the invention is a screw, a further securing can be provided. For this purpose, for example, the threaded shells have a shell head extending radially outwardly outside the internal thread, the composite shell heads, leaving a gap between their edges, yielding a non-round outer head. If now the expansion element inserted into this threaded cups, this may have a screw head which surrounds the shell-like head like a bell. For this purpose, the screw head is provided with a head receptacle in the form of an outer contour of the shell head corresponding head receptacle into which the body formed by the shell heads is able to engage positively.

[024] This embodiment has the advantage that the screw head over a usual

The key is rotatable, while the shell heads through the torque introduced into the threaded cups without the risk that, as a result of Torque the threaded shells are sheared off. Therefore, the head receptacle is preferably designed such that the gap between the shell heads is filled by the head receptacle, so that torque can be transmitted from one shell head to the adjacent shell head via the head receptacle.

[025] The relative mobility of the head body relative to the head receptacle can be suppressed or prevented via a suitable safety measure. In the simplest case, this can be, for example, a latching connection between the head body and the head receptacle. Another embodiment of such a backup consists in a central threaded bore both in the head body and in the head receptacle, so that the screwing a locking screw by the screw head in the head body defines both components relative to each other.

Finally, with the invention, a favorable screw with

Secured against unintentional unscrewing be made. Due to the outward displacement of the threaded cups and consequent engagement in the internal thread, namely, a lower area can now be provided in the threaded cups, which is not provided with a thread. The prerequisite for this is, of course, that behind the internal thread a corresponding space is provided, in which this massive part of the threaded shells can be pressed into it.

Such a construction can either by a blind hole thread through

Spindles of the lower threaded part are made or realized in a through-bolt through the clearance located behind the through hole or by an introduced from the other side bore. Now we used a screw with such threaded cups, this screw spreads by inserting the expansion element, which is not provided with the Aussengwinde area of the threaded shells is also pushed outward. Unscrewing this screw from the thread is then impossible because inevitably a rear screw part abuts the internal thread without Gewindeeinprägung.

Further features and advantages of the invention will become apparent from the subclaims and from the following description of preferred embodiments with reference to the drawings. Short description of drawings

[029] In the drawings:

[030] FIG. 1 shows a screw connection according to the invention before insertion into the internal thread,

[031] FIG. 2 shows the screw connection from FIG. 1 after completion of the insertion process,

[032] FIG. 3 shows the screw connection from FIG. 1 in a top view in section, [033] FIG. 4 shows the expansion element from the screw connection according to FIGS. 1 and 2, and

[034] Fig. 5 shows a threaded cup in another embodiment of the screw connection. The best way to exploit the invention

[035] FIG. 1 shows a component designed as a screw, which is inserted into an internal thread 1. The component has a component body 2, designed here as the head of the hexagonal screw. In order not to screw the screw completely into the internal thread, the external thread of two threaded cups 3 is formed, which can be pressed over a spreader 4 to the outside. Only through this outward pressing the engagement takes place in the internal thread. 1

[036] In the illustrated embodiment, two threaded cups 3 are used.

In the middle region, these threaded cups 3 have a receiving recess 8, in which an elastic Gegenuckelement 14 is arranged. This counter-pressure element is a spring ring, which applies an inwardly directed spring force on the threaded cups 3. The necessary for pressing the threaded cups 3 in the internal thread 1 spreading force is then applied by the geometry of the expansion element 4, which has a spreading / sliding 5 for this purpose. In order to avoid slipping out of the expansion element 4 from the threaded shells 3 in the assembled state, a static friction region 5 'is provided, which has a surface parallel to the lateral surface of the internal thread 1, so that there is a pull-out opposite static friction force.

[037] So that the component is not removed from the internal thread

1 falls apart, the elastic counter-pressure element 14 is held in a guide which is bounded by a front stop 6 and a rear stop 7. By the invention, this guide and the spreading force can now be applied in the middle of the threaded shells 3, so that a subsidence of the threaded cups 3 can be avoided and can be dispensed with a second counter-pressure element 14. Thus, the screw connection according to the invention is made only with a counter-pressure element 14, which can be additionally used as a screw locking, namely by the pushed-spreading element 4 is pushed so far outward that it presses into the internal thread 1.

FIG. 2 shows the screw connection according to FIG. 1 in an assembled state. Here it can be seen how the threaded cups 3 are pressed by the spreader to the outside. In the upper part, the outwardly projecting parts of the threaded cups 3 are assembled into a shell head 12. The expansion element is provided in the upper region with a hexagonal body which is slipped over the shell head 12 and for this purpose has a head receptacle 31. FIG. 3 shows the design of the screw in a plan view in section. The

Threaded shells 3 are configured in the upper, protruding from the inner bore 1 area rectangular and the expansion element 4 has an upper approach in the form of the head of a hexagon screw. To the rectangular shell heads 12, which together form a head body, the upper approach is provided with a lower head receptacle 13, in which the head body is used.

In the embodiment shown here, the rectangular areas are arranged at a distance from one another, wherein the gap is filled by the spreader 4 for torque transmission. The design of the upper screw portion has the advantage that the tightening torque can be transmitted to the threaded cups 3 with the least possible load, since torque transmission from one threaded cup 3 to the opposite threaded cup 3 is possible.

[041] FIG. 4 shows the expansion element in an isolated representation, wherein it can be seen here that the expansion element has laterally flat protruding areas, which are arranged between the two threaded shells 3. Here, the guide of the counter-pressure element 4 is realized by this flat portion has a recess 9, within which the counter-pressure element 14 is guided.

In the assembled state, the counterpressure element is pressed outwards via a projection 10, so that the above-mentioned screw lock results by impressing the elastic counterpressure element into the internal thread. In order to avoid springing back of the expansion element 4, a collar-like safety catch 11 is provided, which forms a positive retention for the counter-pressure element 14.

[043] FIG. 5 shows a further embodiment of a threaded cup 3, here in the lower one

Area is not threaded. If a screw connection is realized with such a component, the lower region will also press outward, in which case a corresponding region is then provided in the internal thread, which is likewise widened radially outwards, in order to allow the non-threaded region the corresponding accessibility ,

In place of such an extended range, of course, a through-bolt can be used, which protrudes freely in the rear area to the outside. The purpose of this rear, non-threaded area is the fact that this will prevent unscrewing the mated screw, as a result of a screwing the end of the external thread of the threaded cup 3 will be achieved.

[045]

[046] 1 internal thread

[047] 2 component body [048] 3 threaded cup

[049] 4 spreading element

[050] 5 Spread sliding area

[051] 5 'friction adhesion area

[052] 6 Front stop

[053] 7 Rear stop

[054] 8 receptacle well

[055] 9 recess

[056] 10 paragraph

[057] 11 snap lock

[058] 12 shell head

[059] 13 head shot

[060] 14 Elastic counterpressure element

[061]

[062] E insertion direction

Claims

Expectations

[001] 1. Component with an external thread for insertion into an internal thread (1) with a

Threaded bolt that has an external thread for screwing into the internal thread (1) and a component body that is directly or indirectly connected to the threaded bolt

(2), wherein the threaded bolt is composed of at least two outer threaded shells (3) movable relative to one another in a direction perpendicular to the screwing-in direction, one between the threaded shells

(3) insertable pin-shaped expansion element (4) and an elastic counter-pressure element (14) for positioning the threaded shells (3) on the expansion element

(4) is formed, and the curvature of the outer surfaces of the threaded shells

(3) corresponds to the radius of the assembled threaded bolt, the threaded shells (3) have on their inside at least one frictional adhesion region (5') parallel to the screwing direction and at least one expansion/sliding region which narrows in the direction of the end of the threaded shells (3) facing away from the component body (3). 5) and the displacement path of the expansion element

(4) is limited relative to the threaded shells (3) by a travel limitation with a front stop (6) and a rear stop (7), characterized in that at least one expansion/sliding area (5) is at a distance from the ends of the threaded bolt is arranged and the elastic counter-pressure element (14) is arranged in a circumferential receiving recess (8) in the outer wall of the threaded shells (3), encompassing the threaded shells (3), the receiving recess (8) being arranged in such a way that it is during the complete Displacement path in the displacement direction of the expansion element (4) is positioned between the front stop (6) and the rear stop (7).

[002] 2. Component with an external thread for insertion into an internal thread according to claim

1, characterized in that the elastic counter-pressure element (14) is an annular spring, in particular a metallic expansion ring.

[003] 3. Component with an external thread for insertion into an internal thread according to one of the two preceding claims, characterized in that the threaded shells (3) have a conically tapering central expansion/sliding area ( 5) and each have at least one frictional adhesion area (5') in front of and behind the central spreading/sliding area (5).

[004] 4. Component with external thread for insertion into an internal thread according to one of the preceding claims, characterized in that the threaded shells (3) are only so large that even in the compressed state The gap between the threaded shells (3) remains, with the expansion element (4) having a flat guide surface extending into the gap in the areas of the gap between the threaded shells (3).

5. Component with an external thread for insertion into an internal thread according to the preceding claim, characterized in that the guide surface extends in the radial direction into the area of the receiving recess (8) and for receiving the elastic counter-pressure element (14) over the entire Displacement path of the expansion element (4) has a recess (9), the elastic counter-pressure element (14) being movable along the recess (9) during the movement of the expansion element (4) and the edges of the recess (9) in the direction of displacement the front stop ( 6) and form the rear stop (7).

6. Component with an external thread for insertion into an internal thread according to the preceding claim, characterized in that the recess (9) in the end region facing away from the free end of the threaded bolt has an outwardly widening cross section over which the elastic counter-pressure element (14) is pressed outwards when the expansion element (4) is inserted and is positioned against the internal thread (1) when the expansion element (4) reaches an end position.

7. Component with an external thread for insertion into an internal thread according to the preceding claim, characterized in that the outwardly widening cross section of the recess (9) is formed by a shoulder (10) which is relative to the recess (8). protrudes from the outside and has at least one area parallel to the insertion direction of the expansion element (4), on which the elastic counter-pressure element (14) rests in the assembled state.

8. Component with an external thread for insertion into an internal thread according to one of the preceding claims, characterized in that in order to prevent unwanted slipping of the elastic counter-pressure element (14) in the assembled state from the shoulder (10) between the shoulder (10) and A locking device (11) is arranged in the form of a small elevation in the remaining area of the recess (9).

[009] 9. Component with an external thread for insertion into an internal thread according to one of the preceding claims, characterized in that the component is a screw and the component body (2) is a screw head.

[010] 10. Screw according to the preceding claim, characterized in that the threaded shells (3) have a shell head (12) which extends to the area provided with the external thread and which extends outwards in the radial direction over the external thread. [011] 11. Screw according to the preceding claim, characterized in that the screw head is connected to the expansion element (4) and on its side facing the internal thread (1) there is a head receptacle (13) for the shell heads (12) of the threaded shells (3 ), wherein the shell heads (12) of the individual threaded shells (3) can be assembled to form a gap-free head body and the head body is held in a form-fitting manner in the head receptacle (13) in the direction of rotation of the head receptacle (13).

[012] 12. Screw according to one of the two preceding claims, characterized in that a latching connection is arranged between the head body and the head receptacle (13).

[013] 13. Screw according to the preceding claim, characterized in that the head body and the head receptacle (13) each have a central threaded hole into which a locking screw can be screwed in to secure against the screw head being pulled off.

[014] 14. Screw connection with a threaded hole and a screw according to one of claims 10, 11 or 12, characterized in that the threaded hole is provided with the internal thread (1) up to a first depth and is at least up to in the thread-free area underneath extends to the outer thread diameter, the thread shells (3) having a length that is greater than the length of the internal thread (1) and are not threaded in the lower area opposite the thread-free area of the threaded hole in the assembled state.