DE2712313A1 - BREAKAGE CONNECTOR FOR MOUNTING ARRANGEMENTS - Google Patents

Description

The invention relates to a breakaway connecting element for mounting arrangements, in which the connecting element connects a preferably vertical post or the like. With a base and the connection is released by an impact force introduced approximately perpendicular to the connection axis through breakage of the connection element, with a substantially axially symmetrical dome, at least one of which is connected to the base and the post or the like Side with an axially for connection in the coupling body extending recess provided length for a connecting member is provided, and which has a plurality of zones of weakness formed by notches around the recess for the Connecting link are attached around and are parallel to the longitudinal axis of the coupling body at least over the length of the for the connecting link provided recess extend.

There are a large number of such predetermined breaking connection elements

loading

709839/0981

FLEUCHAUS & WEHSER Patent Attorneys Z / j £ J

^ Unwr characters: CD 1OP-1580

“£ · Douglas Blanchard.

known to, for security reasons, ζ. B. the breakout of Light poles, the posts for traffic signs and parking meters as well as traffic lights guarantee when on this one side Impact load acts (U.S. Patents 3,630,474, 3,572,223, 3,349,531, 3,521,413). Although these fasteners at a lateral Shock loads, e.g. when a motor vehicle crashes, are to break out safely, they must have sufficiently high compressive and tensile strength show that they can withstand normal loads. However, care should be taken in the event of a collision with a motor vehicle be worn so that the occupants of the motor vehicle are adequately secured by breaking in time.

Many of these breakaway fasteners are designed so that a Shear fracture occurs, d. H. one surface of the broken dome slides over another surface during impact.

With such an element, the desired stability is in the Normal use is not always guaranteed. It is therefore desirable that such predetermined breaking connection elements have a high pressure and Have tensile strength but break relatively easily when subjected to an impact load perpendicular to the direction the maximum strength acts. As a rule, this direction of maximum strength should be the longitudinal axis of the predetermined breaking connection element correspond. The present invention is based on achieving these goals.

According to the invention, this object is achieved for a predetermined breaking connection element mentioned at the outset solved in that devices are provided which trigger the radial breaking out of the connecting element.

These

709839/0981

FLEUCHAUS * WEHSER Patent Attorneys / / I £ J

β- * Un ", ₂ .ich.n: CDIOP-1580

_β <Douglas Blanchard.

According to one embodiment of the invention, these devices can consist of at least one slot in one of the notches, which extend from the upper side of the connecting element parallel to the central axis and which over a shorter distance than the Depth of the recess for receiving the connecting member are formed. In conjunction with one or more such slots A washer can be used which has at least one tooth engaging in a slot on one side and between the connecting element as well as the post or the like arranged is penetrated by the connecting member.

It is also provided that the means for triggering the radial Breaking out of the connecting link consists of a deeper formation of the notch in the upper region of the coupling body, where appropriate the apex edge is particularly sharp-edged. This deeper formation of the notch can be towards the upper end of the dome gradually increase.

Advantageously, the connecting link consists of a softer one Material like the washer, with aluminum for the connecting link either as cast aluminum or extruded aluminum and for the washer Steel can be used.

The washer is provided with a hole, which is one as possible Has smooth inner surface, and preferably works with a breakaway connecting element together, its recess in the coupling body over the distance of the depth of the slots or possibly also the length of the deeper formation of the notch has no internal thread.

The invention with its features and advantages is also described below

based

709839/0981

FLEUCHAUS & WEHSER Patent attorneys £ / I Z O I

«*« _Unwz . _teh . _n: CDIOP-1580

JV Douglas Blanchard. . .

based on exemplary embodiments in conjunction with a drawing described. Show it:

Fig. 1 is a perspective view of a mounting arrangement

with connecting elements having predetermined breaking points.

2 shows a perspective illustration of a connecting element,

which is broken along a predetermined breaking point;

3 shows a perspective illustration of a coupling element

serving connecting element;

Fig. 4 is a perspective view of a coupling element

in a different version;

5, 6 and 8 further embodiments of connecting elements with predetermined breaking points;

7 shows a plan view of a connecting element with predetermined breaking points;

9 is a perspective view of a further embodiment

a connecting element provided with predetermined breaking points;

10 is a perspective view of the connecting element according to FIG

9 in a different embodiment;

Fig. 11 is a side view of a connecting element which together

with a toothed washer is used to reduce the

Fracture release

709839/0981

FLEUCHAUS & WEHSER _. - -. « Patent attorneys Ropes: § Our reference CD 1OP-158 O

_w ·. Douglas Blanchard. . .

To facilitate fracture initiation;

Fig. 12 is a perspective view of the connecting element

according to FIG. 11;

Figure 13 is a perspective view of the toothed washer

according to FIG. 11.

The mounting arrangement 10 shown in Fig. 1 comprises a base plate 12, which is anchored in the ground with four anchor elements in the form of anchor bolts 14, 14a, 14b. With each anchor bolt is a breakaway connector 13, 13a and 13b and a fourth such ^ not shown element connected. On these breakaway connection elements is a Arranged support plate 15, which is held by the connecting elements at a fixed distance from the base plate. The support plate 15 is connected to the breakaway connection elements by means of screw bolts 16, 16a and 16b, the fourth of which is not shown. Each of the connecting elements is arranged in such a way that, with respect to any one of its verticals, it also penetrates the screw bolts Axis is symmetrical. A vertical mast or support 18 is rigidly connected to the support plate 15. The mast or the Support 18 itself serves as a support for z. B. street lamps, traffic signs, parking meters, signal lamps, free-standing roof supports, masts and Like. Elements, such elements also on more than one mounting arrangement can be supported. The predetermined breaking connection elements 13, 13a, 13b and 13c have a relatively high tensile and compressive strength, however, they are easily broken when an impact force is applied in a direction perpendicular to the axis of the connector, i.e., in the horizontal direction is.

InFig. 2 is such a predetermined breaking connection element 13c corresponding to FIG

709839/0981

FLEUCH AUS & WEHSER Patent attorneys S..t. ff Uns.rZ.ich · ..: CDlOP-1580

Douglas Blanchard. . .

Embodiment according to FIG. 1 shown when breaking by a side impact. A part 13c 'is broken off from the body 13c and releases the bolt 16c. In this way, this together with the support plate 15a, through which the bolt extends, after the Dodge the side.

The breakaway connecting element 20 shown in Fig. 3, which instead the connection element shown in Fig. 1 can be used, consists of an elongated body 21 with a cylindrical basic shape with an upper end 22 and a lower end 23. The connecting axis runs through the center of the cylindrical body 21. In the interior of the body, a recess 25 is provided which extends up to extends to the lower end 23 and for the axial insertion of a connecting bolt is provided. The recess can be provided with an internal thread 26. About the length of the connecting bolt Receiving area of the recess 25, the body 21 is provided with a plurality of longitudinally extending weakening zones, which in. Form of grooves or incisions 27 can be formed. Approximately in the middle area of the body 21 another runs along its outer circumference Notch 28 into which the grooves 27 open. On the underside, the recess 25 merges into the recess 29, which is coaxial with the recess 25 is arranged. Finally, in the breakaway connector 20 a bore 30 is also provided, which can be located in the area of the notch 28 and which serves as an opening for a hook wrench is used to install the connecting element.

The predetermined breaking connection element 20 according to FIG. 3 can be used in the assembly arrangement 1 instead of the connecting elements 13, 13a, 13b shown there and the fourth element, not shown, are used.

When a

709839/0981

FLEUCHAUS & WEHSER Patent attorneys Seit.:* Un "rZ.": H. ": CDlOP-1580

. ._, Douglas Blanchard. . .

If a lateral impact acts on the breakaway connection elements, These break as a rule along the notch 28, which prevents the break line from extending to the lower end 23. on the other hand The location of the break line enables bolts 16, 16a, 16b and 16c to be easily removed. Under normal conditions, i.e. when there is no shock load is effective, the breakaway connection elements have sufficient tensile and compressive strength in the direction of their axis A, however, they are relatively soft and compliant in a plane perpendicular to that axis.

4 shows a perspective side view of a further embodiment a predetermined breaking connection element 35. This connection element, which is also designed as a coupling element, has a substantially elongated cylindrical body 36 corresponding to the embodiment according to FIG. 2, A recess runs through the interior of this body 37 with an inner surface 38 which is provided with an internal thread and into which threaded bolts can be screwed. In the cylindrical Bodies are distributed from above approximately in a right-angled assignment around the axis B of the body 36 a plurality of incisions 39 which interrupt the inner surface 38. This also applies to the outer surface 41 of the cylindrical body. The breakaway connecting element is obtained through these incisions 39 35 zones of weakness running lengthways. Furthermore, is also approximately in the middle of the cylindrical Body 36 has a bore 42 for inserting a hook wrench as in the execution form shown in FIG.

The embodiment of Fig. 4 is in comparison with the embodiment According to FIG. 3, it is particularly useful when the loosening of the bolt as a result of a lateral shock load is a somewhat greater resistance should be opposed.

The in

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FLEUCHAUS A WEHSER ο -7 1 O -J 1 Q

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The embodiment of a predetermined breaking connection element 45 shown in FIG. 5 also consists of an at least partially cylindrical one Body 46 with an upper end 47 and a lower end 48. The axis of symmetry of this body is at the same time its central longitudinal axis C. At the upper end 47 extends into the body 46 an axial recess 51 which is provided with an internal thread and for receiving a Screw bolt is used. Distributed over the outer surface, V-shaped notches 52 are provided, which extend approximately over the length of the inner Extend recess 51 and represent the weakening zones. Of the On the underside, another axial recess 54 extends into the body 56, which is coaxial with the central axis of the body and also is provided with an internal thread. The lower part of the body 46 is frustoconical, with the lateral surface from the lower End 48 tapers off towards the center of the body.

The embodiment shown in Fig. 5 is particularly advantageous, if the breakaway connecting element is to be attached to a base plate which is less rigid than the support to be held or the mast, which z. B. is the case when a steel column is to be attached to a concrete base.

The breakaway connecting element 65 shown in FIG. 6 also has one basically cylindrical body 66 with an axial inner recess 67 which carries an internal thread. Are distributed over the outer circumference a plurality of perpendicular notches 68 are provided, which represent a corresponding plurality of weakened zones. Of the Body 66 is attached to the base plate with the aid of a flange 71 fixedly attached to the underside by spreading over the flange Bores 72 anchoring bolts engage in the base plate. These Embodiment is particularly advantageous if the predetermined breaking connection

element 65

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FLEUCHAUS & WEHSER Patent Attorneys ^ f 1 £ <J I α S «lt.:t Un« r2.leh.n CDlOP-1580

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element 65 with a base plate or underlay of low strength such as B. wood is to be connected.

Another embodiment of a breakaway connecting element 55 is shown in Fig. 7 in plan view. This connecting element has a rectangular cylindrical body 56 with an inner bore 57, the extends through the entire length and is provided with an internal thread. The square cross-sectional shape of the body 56 is shown on the Outside provided with notches 58, each along the longitudinal center line of the outer surfaces. These notches preferably have parallel longitudinal side surfaces and a sharply angled V-shaped Bottom surface, the apex line of which runs at a small distance from the bore 57 provided with the internal thread. This embodiment is particularly advantageous when relatively small amounts of breakaway connecting elements are required, as they are with little mechanical effort can be produced quickly and easily from a square material.

The embodiment of a predetermined breaking connecting element 75 shown in FIG. 8 consists of an essentially cylindrical body 76 with a central inner recess 77, which, however, is a smooth one Has inner surface. The side of the body opposite the inner recess 77 is connected to a base plate 78 which has a plurality of Has mounting holes 79. For stiffening, triangular web plates 71 are also distributed in a radial arrangement over the circumference on the body 76 attached, which rest on the base plate 79 and are also firmly connected to this. This embodiment shown in Fig. 8 a Breakaway connecting element is particularly suitable for attaching small signs that are attached to a rod-shaped post are attached, which is provided on the underside with a pin which can be inserted into the recess 77 with a fit.

One

709839/0981

FLEUCHAUS & WEHSER

CDIOP-1580

Our sign:

Douglas Blanchard. . . A modification of a breakaway connecting element according to FIG The embodiment in Fig. 7 is shown in Fig. 9, this connecting element 55 'essentially consisting of a hexagonal rod, A multiplicity of notches 58 are machined into the outer surfaces of the latter. Furthermore, measures are provided that prevent the connecting element from breaking and thus facilitate the release of the connecting bolt 16. These measures are indicated by the reference sign 83 and can consist of a more acute-angled formation of the V-shaped bottom part 84 of the notch 58. This experiences the notch 58 at the top At the end of the predetermined breaking connection element 55 ', a slightly larger cross-sectional area is achieved, which results in a further weakening of the material will. This allows the radial impact force to be reduced, which is necessary to trigger a break in the connecting element 55 ', however, the tensile and compressive strengths which the element has under normal stress are hardly influenced to any significant extent.

The embodiment of the predetermined breaking connection element 55 ″ shown in FIG. 10 differs from the embodiment according to FIG 9 in that slots 87 are parallel from the upper end face in the region of the largest depression of the notch in the connecting element are incised running to the longitudinal axis. These slots 87 extend a distance D which is shorter than the length L, which is claimed by a connecting bolt 16 inserted into the recess 57. In this embodiment, the outer surfaces are 85 of the body between the notches 58 is rounded in contrast to the roof-shaped configuration according to FIGS. 7 and 9.

In the embodiment of a breakaway connecting element shown in FIG. 11 55 '' 'another part is provided with which the break is to be triggered in the event of a lateral impact load. That

Connection

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FLEUCHAUS & WEHSER ο Τ Patent Attorneys £. V Our review: CD10P-1580

* / fL Douglas Blanchard. .

Connecting element 55 '' 'corresponds essentially to the connecting element 55 ″ according to FIG. 10. However, the slots 87 ′ are preferably made somewhat wider than the slots 87 in the connection element 55 ″. The part of the inner surface 90 over the distance D between the upper end surface and the lowest point of the slot 87 'is also without an internal thread which extends only over the portion T of the inner cylindrical recess. The one screwed into the connecting element Connecting bolt 16 thus extends only approximately over the Length L, which is equal to the sum of the sections D 'and T. Between the support plate 15 and the breakaway connecting element 55 '' 'is a Toothed washer 93 placed, which is preferably provided with several teeth 94 on the one support side. The teeth are designed in such a way that that they engage in the slots 87 '. The toothed washer has an inner bore 95 through which the connecting pin 16 into the Connecting element 55 '' 'engages. The teeth 94 of the washer are preferably provided with a flattened apex. Also is the Inner surface 97 of the bore 95 is made as smooth as possible, so that there is as little adhesion as possible between the washer and the connecting bolt 16 can result. This toothed washer 93 is preferably made of a harder material such as the breakaway connecting element 55 '' ' manufactured and consists in a predetermined breaking connecting element made of aluminum preferably made of steel. Although only three teeth are shown in Fig. 3, it will be understood that the same number of Teeth 94 as the number of slots 87 'can be provided in the connecting element. Through the teeth 94 the whole of a lateral Force resulting from impact is better introduced into the breakaway connecting element, so that a desired break occurs more reliably.

The breakaway connecting elements according to the invention can be made from a wide variety of different materials, wherein in particular the property of the material is crucial that

" a material

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FLEUCHAUS A WEHSER Patent attorney

Un-rZicn.,.:

CD10P-1580

a material break occurs under the desired conditions. It can both aluminum in cast or machined form as well as steel, brass, bronze, stainless steel, zinc alloys or the like. Find use. The use of plastic materials is also envisaged, with phenol formaldehyde resins, polystyrene, or nylon Like. Materials are suitable. Ceramic materials can also be used. The breakaway connection elements can be used both as Cast elements as well as extruded elements be made, with z. B. elements as shown in Fig. 5 and 8, preferably from There are cast aluminum, whereas elements according to FIGS. 7, 9 and 10 are preferably extruded.

In the case of the breakaway connection elements according to the invention, between two and 20 in the longitudinal direction, depending on the application extending weakening zones provided. These weakling zones are preferably in the form of notches or grooves Depressions distributed over the outer surface of the connecting element attached. The depth of the individual notches can vary depending on the application between 10 to 90% of the wall thickness excluding the thread depth, preferably a depth of 15 to 20% of the wall thickness Will apply. These notches should be V-shaped as possible and end with a sharp-edged apex, the radius at the apex should not be greater than about 0.05 mm. Ever However, depending on the application, radii of up to 5 mm can also be tolerated. For such a predetermined breaking connection element, at least two Notches may be present as weakening zones, but generally not more than 20 such notches are required. It shows that as a rule between three to six notches are made. For most applications these are notches provided distributed symmetrically about the longitudinal axis, so that during installation

of the sol

709839/0981

FLEUCHAUS AWEH8ER Patent attorney

β ** W Uo «rZ ^ cl» n CDI OP-158 O

of the predetermined breaking connecting element no consideration of the orientation must be taken. However, there can also be applications in which the longitudinal weakening zones are only on one side are provided, which is remote from the impact or impact side. The breakaway connection elements according to the invention break in the Usually because of a stress fracture triggered in the bottom area of the longitudinal notches and less because of a shear fracture. Therefore, the connecting elements have a relatively high pressure and tensile strength with respect to the impact force required to initiate a break, which is in a direction perpendicular to the axis of the connecting element acts. The tolerance range of the required impact force for a break is for a given embodiment of the element to Element relatively small.

Claims

709839/0981

Claims (10)

Claims Breakaway connecting element for assembly arrangements in which the connecting element is preferably vertical Post or the like. Connects to a base and the connection by an impact force introduced approximately perpendicular to the connection axis is released by breaking the connecting element, with a substantially axially symmetrical dome body, of which at least one of the sides connected to the base and the post or the like with one axially for connection into the dome body extending recess of the intended length is provided for a connecting member, and which a plurality of by notches has formed weakening zones which are attached around the recess for the connecting member and are parallel to the longitudinal axis of the coupling body extend at least over the length of the recess provided for the connecting member, thereby characterized in that devices (84; 87, 93) are provided which prevent the radial breaking out of the connecting element (55, 55 ' 55 '"). 2. predetermined breaking connection element according to claim 1, characterized in that that the devices consist of: a) at least one slot (57) in one of the notches (58), which 709839/0981 ORIGINAL INSPECTED FLEUCHAUS & WEHSER Patent attorneys Z / I Z O I Page · Our reference CDI OP-1580 extend from the upper end of the connecting element parallel to the central axis and which over a shorter distance (D ') run as the depth (L) of the recess for the connecting link (16), b) and optionally a washer (93) which has at least one tooth (94) engaging in a slot (57) on one side. and arranged between the connecting element and the post or the like penetrated by the connecting member (16) is. 3. predetermined breaking connection element according to claim 2, characterized in that that the washer (93) is made of a material that is harder than the material of the coupling body. 4. predetermined breaking connection element according to claim 3, characterized in that that the washer (93) is made of steel and the coupling element is made of aluminum. 5. predetermined breaking connection element according to claim 2, characterized in that that the connecting member (16) consists of a screw bolt which is inserted into the internally threaded recess of the The coupling body can be screwed in, and that the recess in the coupling body has a thread-free inner surface over the distance (D ') of the length of the Has slots (57). 6. predetermined breaking connection element according to claim 2, characterized in that that the washer (93) has an inner bore through which the connecting member (16) extends and that the Inner surface of this hole is relatively smooth and unthreaded Has surface. 709839/0981 FLEUCHAUS & WEHSER Patent Attorneys £ / I £ Jf I O Sort: / our reference: CDlOP-1580 • 3 · 7. predetermined breaking connection element according to claim 1, characterized in that that the means for triggering the radial breakout of the connecting element one with a sharper apex edge formed notch at the top of the dome. 8. predetermined breaking connection element according to claim 1, characterized in that that the radial breakout of the connecting element triggering devices consist of slots, which from the upper end of the dome in the area of the apex of the notches parallel to the central axis over a distance (D ') extend which is shorter than the depth of the connecting member (16) receiving recess. 9. predetermined breaking connecting element according to claims, characterized in that that each notch is assigned a slot (57). 10. Breakaway connecting element according to one or more of the claims 1 to 9, characterized in that the notches (58) extend over the entire length of the coupling body of the connecting element extend. 709839/0981