Expansion anchor

FIELD: devices for fastening or securing constructional members.

SUBSTANCE: expansion anchor comprises expansive bushing and stay bolt for expanding bushing of the anchor. The stay bolt has thread whose back edge is angled by about 45° or less to the axis of the stay bolt. The bolt thread pitch is large and approximately equal to or greater than the inner diameter of the bolt thread. At least one section of the bolt turn has the edge which prevents the stay bolt against unscrewing from the bushing of the anchor and arranged along the axis of the stay bolt and radially to the stay bolt and points to the direction of the unscrewing of the stay bolt.

EFFECT: enhanced reliability.

9 cl, 6 dwg

 

The invention relates to the plugs with signs of restrictive part of paragraph 1 of the claims.

Such spacer dowels known. They have a sleeve anchors, which can be screwed spacer screw and spacer screw expanding sleeve anchors when turning. Typically, sleeve anchor has a longitudinal groove or held at an angle to the longitudinal direction of the grooves that separate the bushing dowel spacer on the tabs that are open or apart when turning spacer screw spacer dowel or, respectively, the spacer sleeve is extended or extendible. Another possibility is that the sleeve anchor is made of elastically and/or plastically extensible material, in particular made of plastic. When extending or respectively razdevanie spacer dowel is fixed in the hole, for example in the brickwork.

Known dowels have the disadvantage that they are attenuated when extending openings, such as cracks in the masonry, reducing its pressure or stretching.

The basis of the invention lies task to improve spacer dowel above-mentioned type so that when the extension of the hole he had a high pressure or stretching.

This task in accordance with ISO what rutenium solved signs of paragraph 1 of the claims. Spacer screw corresponding to the invention of the plugs is threaded, back in the direction of torsion of the edge which is flat at an angle of about 45° or less to the axial direction of the spacer screw. Rear in the direction of the tightening edge of the thread of the screw forms a slanted or spacer surface that when the axial load spacer screw in the direction of extrusion further extends or expands the sleeve anchors. Rear in the direction of tightening flange forms a conical spacer body. Relative to its distance steps back in the direction of torsion of the edge can be represented as a set of axial consecutive spacer cones. However, as the thread of the screw has the advantage that the securing screw can be screwed into the sleeve anchors or to get out of it.

If the hole in which the corresponding fixed to the invention the spacer dowel, expanding, spacer screw, at its axial loading in the direction of extrusion is pulled out of the sleeve anchors in the axial direction by a small amount. While under a flat angle of about 45° or less to the axial direction of the rear in the direction of tightening flange thread spacer screw further expands the sleeve anchors. Distance du is spruce continues to increase and remains fixed in the hole with approximately constant pressure.

Additionally, the threaded spacer screw corresponding to the invention of the plugs is a big step, which corresponds approximately to the inner diameter of the thread of the screw or greater. Thus, it is extended in the axial direction, the rear in the direction of screwing, the edge of the thread of the screw. Since the maximum opening of the sleeve anchor occurs when the movement distance of the screw relative to the sleeve anchors in the direction of pull on the thread, that is a step, the invention provides a long path stretching and the consequent great expansion.

Thus, corresponding to the invention the spacer dowel has the advantages of further expansion, so that it is suitable in areas of tension, high movement distance of the screw relative to the sleeve anchors in the direction of pulling up to the maximum extension sleeve anchors and a large maximum extension sleeve anchors, and therefore, when a relatively large extensions of the holes provides a solid fit the plugs in the hole. Another advantage of corresponding to the invention of the plugs is that they are suitable for solid building materials, such as concrete and hollow construction mA the materials, as, for example, hollow brick. Suitable for hollow building materials provided by the fact that the spacer screw evenly pushes the sleeve anchors along the entire length of the thread, resulting also achieved the sliding sleeve anchors in the area of one or more jumpers hollow brick and securing therein the plugs. Added to this is the advantage that corresponding to the invention the spacer dowel is inserted into the hole without rotational movement, for example, can ubivatsya by a hammer or an electric percussion instrument. If the spacer dowel is fully driven into the hole, then, in order to achieve preliminary voltage and the separation of the plugs, spacer screw may be tightened, which is enough to turn on incomplete turn. The delay spacer screw, in General, is not required, since the spacer dowel is moved by the axial loading in the direction of extrusion, that is secured in the hole when loading.

A variant embodiment of the invention provides for preventing twisting device which prevents twisting spacer screw from the sleeve anchors. Due to the large thread pitch, there is a possibility that the thread of the screw is not in effect. No sumotori the supply means, that axial load leads to a rotation of the spacer screw and twisting of the sleeve anchors. Protects against twisting device prevents twisting spacer screw from the sleeve anchors for axial loading spacer screw. Thereby is achieved that the axial load spacer screw in the direction of extrusion contributes to the spread and subsequent unclamping the plugs. Protects against twisting device preferably should allow the desired twisting spacer screw from the sleeve anchor through a torque actuator spacer screw. The twisting of the spacer screw from the sleeve anchors should preferably be possible, at least when outside holes and/or when not expanded the spacer dowel. As the braking or lack of locking depends on the geometry of the threads of the screw from the other influence on the friction factors as the material of the pair, the state of lubrication, contamination of the drill flour or the like, and, depending on the circumstances, from temperature and specific pressure, the braking or no locking is not necessarily set in advance, but may be set at the same fixed anchors depending on the respective conditions of use. Corresponding to the invention the pre is guarding against twisting device prevents undesirable twisting spacer screw from the sleeve anchors for axial loading spacer screw in the direction of extrusion, when the braking is missing.

A variant embodiment of the invention provides for preventing twisting the edge of the screw spacer screw, which runs approximately in the longitudinal direction of the spacer screw and approximately radially to the spacer screw. Protects against twisting edge oriented in the direction of twisting the spacer screw. Protects against twisting edge causes a sawtooth cross-section of the thread of the screw and when the opening is pressed into the sleeve anchors and prevents because of its orientation to the twisting spacer screw from the sleeve anchors. When when not expanded sleeve anchors preventing twisting the edge is not pressed or only slightly pressed into the sleeve of the dowel so that the dowel screw can wriggle out of the sleeves of the dowel. Protects against twisting edge does not prevent the screwing spacer screw into the sleeve anchors.

A variant embodiment of the invention provides for a shared edge protects against twisting edge to edge, for example, back in the direction of the tightening edge of the thread of the screw. In this embodiment of the invention protects against twisting flange radially does not project over the edge of the thread of the screw and thereby prevents the desired screwing spacer screw in ner is sdvinuta sleeve anchors or twisting out of it. When razdevanie preventing twisting edge is pressed into the sleeve anchors and consequently prevents undesirable twisting spacer screw for axial loading in the direction of extrusion.

Variant implementation of the invention involves providing roughness on the underside of the head spacer screw as protecting from twisting devices. Under the lower edge means facing toward the shank of the screw and the screw thread end side of the screw head. This variant implementation of the invention can be provided additionally or alternatively to the above protects against twisting edge. The roughness on the underside of the screw head increases the friction between the screw head and adjacent to the lower side of the fixed spacer screw spacer dowels product. Since fixed the product load spacer screw on the bottom side of his head axially in the direction of extrusion, which increases the friction roughness prevents rotation of the stud screw and thus the twisting of the sleeve anchor.

Roughness in one embodiment of the invention can be made in the form of ribs or radial ribbing.

To prevent rotation of the bushing dowel hole in the TII one variant embodiment of the invention provides tangentially protruding from the sleeve anchors preventing rotation elements.

Hereinafter the invention is explained in more detail through the drawings of option exercise. The drawings show:

figure 1 - spacer screw corresponding to the invention of the plugs, in the future,

figure 2 - spacer screw of figure 1, a side view,

figure 3 - cross section of a spacer screw of figure 1 and 2 along the line III-III in figure 2,

4 is a sleeve anchors corresponding to the invention of the plugs, in the future,

5 is an axial slit sleeve anchors on figure 4, and

6 is a side view of the rear end of the dowel sleeve at 4 and 5 in direction of arrow VI in figure 5.

Represented in the drawings corresponding to the invention the spacer dowel is made for example of steel spacer screw 10, which is represented in figure 1-3, and consisting preferably of plastic spacer 12, presents figs.4-6. Spacer screw 10 has a head 14 that is free from the threads of the rod 16 and the threads 18, which are made in one piece with each other. Thread 18 of the screw is single and has a large thread pitch Phthat in the present described embodiment, is equal to 41/2the interior diameters of dk. Rear in the direction of tightening the flange 20 of the thread 18 of the screw is located under a flat angle α, 9°to the axial direction of the spacer screw 10. With this back healthy lifestyles in the Institute of tightening flange 20 is directed to the head 14 of the screw edge 20 of the thread 18 of the screw. Thanks to the flat corner α back in the direction of torsion of the edges 20 of the thread 18 of the screw of the rear edge 20 has a shape that is similar to the cone.

The front in the direction of tightening the flange 22 of the thread 18 of the screw is oriented substantially steeper, and presented and described embodiment of the invention it passes at an angle β, 30°to the axial direction of the spacer screw 10.

On the segment of a circle made rectangular in cross-section spacer screw 10 mill 24. Milling 24 has a depth which is less than the height of the thread of the screw. In addition, milling 24 does not pass inside to rod thread 18 of the screw. Milling 24 is repeated one time for the step Ph.

As is clearly seen on the figure 3 presents the cross section of the spacer screw 10, the milling 24 has a radially oriented flange 26 and tangentially oriented edge 28. Radially oriented flange 26 facing in the direction of the twisting spacer screw 10, with the right thread radially oriented flange 26 facing in the direction of left rotation. The radial flange 26 milling 24 is further defined as preventing twisting edge 26. Milling 24 attached figure 3 presents the cross-section of the thread 18 spacer screw 10 in the area of protecting from wicr is zivania edges 26 sawtooth appearance. Protects against twisting flange 26 has a common edge 30 with the rear in the direction of the torsion spacer screw 10 edge 20 of the thread 18 of the screw.

On the underside of the head 14 of the screw has a corrugation 32 with a radial notch. The underside of the head 14 of the screw is turned to the terminal 16 and the threads 18 of the screw end side of the head 14 of the screw.

Presents figs.4-6 sleeve 12 corresponding to the invention of the plugs, as seen in figure 5, is free from carving hollow rod section 34 at its rear end or the end of input, which is open for the introduction of a spacer screw 10. Hollow rod section 34 has approximately the same length, and free from threaded rod spacer 16 of the screw 10, and when introduced into the sleeve 12 of the dowel spacer screw 10 is free from the threads of the rod 16 spacer screw 10 is free from the threads floors rod section 34 of the sleeve 12 of the dowel. Having an internal thread 36 of the hollow rod section 38 as a whole is connected with the free from carving hollow rod section 34. Inner thread 36 formed a response to the thread 18 spacer screw 10. In having a female thread 36 floors rod section 38 of the sleeve 12 of the dowel has a discontinuous longitudinal grooves 40, which divide the sleeve 12 dowels on pushing the tabs 42. Therefore, having an internal cut the BU 36 and the longitudinal grooves 40 of the hollow rod section 38 described later as an expansion region 38. In the present embodiment, the sleeve 12 has two dowels located opposite to each other in the longitudinal groove 40, which divide the sleeve 12 dowels in the spacer region 38 on the two pushing the tongue 42, which run in the circumferential direction, respectively, by approximately 180°. The front or input end 43 of the sleeve 12 dowels made closed.

Each of the two parting the reeds 42 has lots of sequentially arranged in the longitudinal direction of the sleeve 12 dowels formed triangular in horizontal projection of the plates 44. Plates 44 are approximately in the tangential direction, as clearly shown 6 is the side view of the sleeve 12 of the dowel. Plate 44 is formed preventing rotation of the elements, which prevent rotation of the sleeve 12 of the dowel in the hole.

The sleeve 12 of the dowel has consistently placed in its longitudinal direction, radially protruding pointed sloping elements 46. Sharp angled elements 46 are located on the rear parcel spacer region 38 and the front part is free from the threads of the hollow rod section 34. In axial cross-section on figure 5 pointed sloping elements 46 formed sawtooth, and they form a Christmas tree profile and prevent twisting of the sleeve 12 of the anchor from the hole.

The functionality is the formation and use of the invention the plugs, containing spacer screw 10 and nut 12 dowels, as follows: to apply the plugs spacer screw 10 is screwed into the sleeve 12 of the dowel. When this spacer screw is not tightened, so as not to close the sleeve 12 of the dowel. In addition, you can use spacer screw 10 as the rod for expanding the sleeve 12 of the dowel. In this case spacer screw 10 after fabrication of the sleeve 12 dowels already invested in it. Inserted into the sleeve 12 of the dowel spacer screw spacer 10 dowel, ready to use, and it is a condition of delivery of the plugs. For fixing in the hole, for example, are not represented clutch, thrust dowel, that is, the sleeve 12 of the dowel with the inserted spacer screw 10, is driven, for example, with a hammer or an electric percussion instrument, through a through hole in which was fixed on the clutch, not shown, the product into the hole in the masonry. Spacer dowel is driven into the hole until until the head 14 of the screw its lower edge will not come into contact with the fixed product. When driving the plugs front in the direction of tightening the flange 22 of the thread 18 spacer screw 10 acts as a support or item transfer motion transmitting the driving force through the geometric closures on sleeve 12 dowels, and thereby drives the sleeve 12 dub the La into the hole. Securing the plugs in the hole ends up driving, and tightened by rotation of the spacer screw 10 is not required. Of course, the spacer screw 10 after driving may be delayed to allow for expansion and pre-stressing the plugs 10, 12. To tighten enough to turn on the share of turnover spacer screw 10.

If spacer screw 10 is axially loaded in the direction of extrusion, then back in the direction of tightening flange 20, oriented under a flat angle α to the axial direction acts on the type of the conical surface and pushes the pushing the tabs 42 of the sleeve 12 dowels from each other. The sleeve 12 of the dowel slides apart, and thrust dowel 10, 12 is fixed in the hole. Thread 18 spacer screw 10 with its oriented under a flat angle α to the axial direction of the rear edge 20 relative to its distance may be seen as a set of axial consecutive spacer cones that when axial loading spacer screw 10 in the direction of extrusion expand the sleeve 12 dowels in the spacer region 38. When extending openings, for example, due to cracking of the masonry spacer screw 10 when the axial loading in the direction of extrusion further expands the sleeve 12 of the dowel so that the favor of the hydrated dowel 10, 12 with the expansion hole remains fixed in it with almost constant pressure. Spacer dowel 10, 12 has the possibility of further expansion, that is, it is suitable in areas of tension. A big step Rhthread spacer screw 10 provides long way spacer screw 10 relative to the sleeve 12 dowels in the direction of twisting for the expansion and subsequent extensions. A big step Rhthread prevents pulling spacer screw 10 at step Phthread of the sleeve 12 dowels, whereupon the sleeve 12 dowels with its internal thread 36 "darted" would turn around the threads 18 of the screw, and remove the extension.

In any case, due to the large step Rhthread cannot be excluded, the braking distance of the screw 10 in the sleeve 12 of the dowel. No locking means that the axial load spacer screw in the pull direction causes rotation of the spacer screw 10 in the direction of the twisting and spacer screw 10 gets out of sleeve anchors for axial loading. To avoid this, the turns of the thread 18 of the screw is provided above protects against twisting edges 26. Protects against twisting edges 26 are pressed his ribs 30 in the sleeve 12 of the dowel when it is expanding. In addition, it is not required, the button keeps from twisting edges 26 radially performed over the edges 20, 22 thread 18 of the screw. Pressed into the sleeve 12 dowels preventing twisting edges 26 to form a support that prevents twisting spacer screw in its axial loading in the direction of twisting in the absence of a self-locking thread 18 of the screw and the internal thread 36 of the sleeve 12 of the dowel. Preventing twisting of the flange 26 is formed preventing twisting device the plugs 10, 12.

If the spacer dowel 10, 12 is not extended and, in particular, if it is outside of the hole, the ribs 30 prevent from twisting edges 26 is not pressed into the sleeve 12 of the dowel so that the dowel screw 10 can wriggle out of the sleeves 12 of the dowel.

Other protecting from twisting device formed by the ribs 32 on the underside of the head 14 of the screw. If spacer screw 10 is loaded fix them on the wall product axially in the direction of extrusion, the product is attached to having a corrugation 32 the underside of the head 14 of the screw. As the product is not rotating, then increased corrugation 32 friction between the head 14 of the screw and the product prevents rotation of the stud screw 10, in particular the twisting of the spacer screw 10 of the sleeve 12 dowels in the absence of a self-locking thread 18 of the screw.

Oriented under a flat angle α to the axial direction of the spacer screw rear edge 20 of the thread 18 of wines is and, which acts upon the type axial consecutive spacer cones, expanding sleeve anchors evenly over the entire length of the spacer region 38. Consequently, corresponding to the invention the spacer dowel 10, 12 is suitable for solid building materials and hollow building materials, such as hollow brick, as at uniform expansion throughout the length of the spacer region 38 is expanding in the area, at least one jumper hollow brick which secures the spacer dowel 10, 12 in hollow brick.

1. Spacer dowel with the expandable sleeve and the spacer screw for expansion sleeve anchors, characterized in that the spacer screw (10) has a thread (18), back in the direction of tightening flange (20) which has a flat angle (α) about 45° or less to the axial direction of the spacer screw (10)with the thread (18) of the screw has a large step (Rh) thread, which is approximately equivalent to or larger than the inner diameter (dk) thread (18) of the screw thread (18) of the screw, at least one site has protection from twisting spacer screw (10) of the sleeve (12) of the dowel edge (26), which runs approximately in the longitudinal direction of the spacer screw (10) and are oriented approximately glad the material for the spacer screw (10) and which faces the direction of twisting spacer screw (10).

2. Expansion dowel according to claim 1, characterized in that the rear in the direction of tightening flange (20) of the thread (18) spacer screw passes at an angle (α) about 9° to the axial direction of the screw (10).

3. Expansion dowel according to claim 1, characterized in that step (Rh) thread (18) spacer screw (10) is more than twice larger than the inner diameter (dk) thread of the screw.

4. Expansion dowel according to claim 3, characterized in that step (Rh) thread (18) spacer screw (10) is approximately equal to 4.5 internal diameters (dk) thread of the screw.

5. Expansion dowel according to claim 1, characterized in that it protects against twisting edge (26) has a common edge (30) with the edge (20, 22) of the thread (18) of the screw.

6. Expansion dowel according to claim 1, characterized in that the spacer screw (10) has a head (14), the underside of which has a surface roughness (32) to prevent twisting spacer screw (10) of the sleeve (12) of the dowel.

7. Expansion dowel according to claim 6, characterized in that the cylinder (14) screws on its bottom side as roughness has a corrugation (32).

8. Expansion dowel according to claim 6, characterized in that the cylinder (14) screws on its bottom side as roughness has a radial ribbing.

9. Expansion dowel according to claim 1, characterized in that the sleeve (12) of the dowel has a protruding approximately in the tangential direction before renaudie rotation elements (44).

10. Expansion dowel according to claim 1, characterized in that the spacer screw (10) pre-inserted into the sleeve (12) of the dowel.



 

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